refactor: all the clippy lints

Cargo.toml

@@ -3,15 +3,46 @@ explicit_outlives_requirements = "warn"
 unused_qualifications = "warn"
 
 [workspace.lints.clippy]
+# Restrictions
 cloned_instead_of_copied = "warn"
+create_dir = "warn"
 dbg_macro = "warn"
+get_unwrap = "warn"
+rc_mutex = "warn"
 str_to_string = "warn"
+string_lit_chars_any = "warn"
+
+# Groups
+complexity = "warn"
+perf = "warn"
+style = "warn"
+suspicious = "warn"
+
+# To allow us to override certain lints
+cargo = { level = "warn", priority = -1 }
+pedantic = { level = "warn", priority = -1 }
+
+# lints we want to allow
+cast_possible_truncation = "allow"           # Not really a good way to handle this issue
+missing_errors_doc = "allow"                 # Becomes highly redundant for functions accessing the database
+missing_panics_doc = "allow"                 # We *should* only ever use unwraps/expects where infallable
+module_name_repetitions = "allow"            # Many things are ex-expored, and in many cases removing repetitions just makes things more confusing
+multiple_crate_versions = "allow"            # Would require quite a lot of effort for minimal gain
+must_use_candidate = "allow"                 # Basically useless, even the docs say it's "Not bad at all"
+redundant_closure_for_method_calls = "allow" # `.ok()` is nicer than `std::result::Result::ok` (which needs to be done where we use our own `Result`)
+struct_excessive_bools = "allow"             # Very easy to spot, and the behaviour it encourages to use is much worse than not using this at all
+too_many_lines = "allow"                     # Some functions are complicated, and won't really be re-used in other places
+
+# fixed in !670
+doc_markdown = "allow"
 
 [package]
 authors = ["timokoesters <timo@koesters.xyz>"]
+categories = ["web-programming::http-server"]
 description = "A Matrix homeserver written in Rust"
 edition = "2021"
 homepage = "https://conduit.rs"
+keywords = ["homeserver", "matrix", "selfhost"]
 license = "Apache-2.0"
 name = "conduit"
 readme = "README.md"

src/api/appservice_server.rs

@@ -17,11 +17,8 @@ pub(crate) async fn send_request<T>(
 where
     T: OutgoingRequest + Debug,
 {
-    let destination = match registration.url {
+    let Some(destination) = registration.url else {
-        Some(url) => url,
-        None => {
         return Ok(None);
-        }
     };
 
     let hs_token = registration.hs_token.as_str();
@@ -33,7 +30,7 @@ where
             &[MatrixVersion::V1_0],
         )
         .unwrap()
-        .map(|body| body.freeze());
+        .map(BytesMut::freeze);
 
     let mut parts = http_request.uri().clone().into_parts();
     let old_path_and_query = parts.path_and_query.unwrap().as_str().to_owned();

src/api/client_server/account.rs

@@ -69,11 +69,11 @@ pub async fn get_register_available_route(
 /// to check if the user id is valid and available.
 ///
 /// - Only works if registration is enabled
-/// - If type is guest: ignores all parameters except initial_device_display_name
+/// - If type is guest: ignores all parameters except `initial_device_display_name`
 /// - If sender is not appservice: Requires UIAA (but we only use a dummy stage)
 /// - If type is not guest and no username is given: Always fails after UIAA check
 /// - Creates a new account and populates it with default account data
-/// - If `inhibit_login` is false: Creates a device and returns device id and access_token
+/// - If `inhibit_login` is false: Creates a device and returns device id and `access_token`
 pub async fn register_route(body: Ruma<register::v3::Request>) -> Result<register::v3::Response> {
     if !services().globals.allow_registration() && body.appservice_info.is_none() {
         return Err(Error::BadRequest(
@@ -149,7 +149,7 @@ pub async fn register_route(body: Ruma<register::v3::Request>) -> Result<registe
                 stages: vec![AuthType::RegistrationToken],
             }],
             completed: Vec::new(),
-            params: Default::default(),
+            params: Box::default(),
             session: None,
             auth_error: None,
         };
@@ -161,7 +161,7 @@ pub async fn register_route(body: Ruma<register::v3::Request>) -> Result<registe
                 stages: vec![AuthType::Dummy],
             }],
             completed: Vec::new(),
-            params: Default::default(),
+            params: Box::default(),
             session: None,
             auth_error: None,
         };
@@ -307,7 +307,7 @@ pub async fn register_route(body: Ruma<register::v3::Request>) -> Result<registe
 /// - The password hash is calculated using argon2 with 32 character salt, the plain password is
 /// not saved
 ///
-/// If logout_devices is true it does the following for each device except the sender device:
+/// If `logout_devices` is true it does the following for each device except the sender device:
 /// - Invalidates access token
 /// - Deletes device metadata (device id, device display name, last seen ip, last seen ts)
 /// - Forgets to-device events
@@ -323,7 +323,7 @@ pub async fn change_password_route(
             stages: vec![AuthType::Password],
         }],
         completed: Vec::new(),
-        params: Default::default(),
+        params: Box::default(),
         session: None,
         auth_error: None,
     };
@@ -375,12 +375,12 @@ pub async fn change_password_route(
 
 /// # `GET _matrix/client/r0/account/whoami`
 ///
-/// Get user_id of the sender user.
+/// Get `user_id` of the sender user.
 ///
 /// Note: Also works for Application Services
 pub async fn whoami_route(body: Ruma<whoami::v3::Request>) -> Result<whoami::v3::Response> {
     let sender_user = body.sender_user.as_ref().expect("user is authenticated");
-    let device_id = body.sender_device.as_ref().cloned();
+    let device_id = body.sender_device.clone();
 
     Ok(whoami::v3::Response {
         user_id: sender_user.clone(),
@@ -410,7 +410,7 @@ pub async fn deactivate_route(
             stages: vec![AuthType::Password],
         }],
         completed: Vec::new(),
-        params: Default::default(),
+        params: Box::default(),
         session: None,
         auth_error: None,
     };

src/api/client_server/alias.rs

@@ -121,7 +121,7 @@ pub(crate) async fn get_alias_helper(
             .send_federation_request(
                 room_alias.server_name(),
                 federation::query::get_room_information::v1::Request {
-                    room_alias: room_alias.to_owned(),
+                    room_alias: room_alias.clone(),
                 },
             )
             .await?;
@@ -166,14 +166,11 @@ pub(crate) async fn get_alias_helper(
         }
     };
 
-    let room_id = match room_id {
+    let Some(room_id) = room_id else {
-        Some(room_id) => room_id,
-        None => {
         return Err(Error::BadRequest(
             ErrorKind::NotFound,
             "Room with alias not found.",
-            ))
+        ));
-        }
     };
 
     Ok(get_alias::v3::Response::new(

src/api/client_server/backup.rs

@@ -86,7 +86,7 @@ pub async fn get_backup_info_route(
         etag: services()
             .key_backups
             .get_etag(sender_user, &body.version)?,
-        version: body.version.to_owned(),
+        version: body.version.clone(),
     })
 }
 
@@ -139,7 +139,7 @@ pub async fn add_backup_keys_route(
                 room_id,
                 session_id,
                 key_data,
-            )?
+            )?;
         }
     }
 
@@ -185,7 +185,7 @@ pub async fn add_backup_keys_for_room_route(
             &body.room_id,
             session_id,
             key_data,
-        )?
+        )?;
     }
 
     Ok(add_backup_keys_for_room::v3::Response {

src/api/client_server/context.rs

@@ -11,7 +11,7 @@ use tracing::error;
 /// Allows loading room history around an event.
 ///
 /// - Only works if the user is joined (TODO: always allow, but only show events if the user was
-/// joined, depending on history_visibility)
+/// joined, depending on `history_visibility`)
 pub async fn get_context_route(
     body: Ruma<get_context::v3::Request>,
 ) -> Result<get_context::v3::Response> {
@@ -22,7 +22,7 @@ pub async fn get_context_route(
         LazyLoadOptions::Enabled {
             include_redundant_members,
         } => (true, *include_redundant_members),
-        _ => (false, false),
+        LazyLoadOptions::Disabled => (false, false),
     };
 
     let mut lazy_loaded = HashSet::new();
@@ -103,8 +103,7 @@ pub async fn get_context_route(
 
     let start_token = events_before
         .last()
-        .map(|(count, _)| count.stringify())
+        .map_or_else(|| base_token.stringify(), |(count, _)| count.stringify());
-        .unwrap_or_else(|| base_token.stringify());
 
     let events_before: Vec<_> = events_before
         .into_iter()
@@ -159,8 +158,7 @@ pub async fn get_context_route(
 
     let end_token = events_after
         .last()
-        .map(|(count, _)| count.stringify())
+        .map_or_else(|| base_token.stringify(), |(count, _)| count.stringify());
-        .unwrap_or_else(|| base_token.stringify());
 
     let events_after: Vec<_> = events_after
         .into_iter()
@@ -176,21 +174,15 @@ pub async fn get_context_route(
             .get_statekey_from_short(shortstatekey)?;
 
         if event_type != StateEventType::RoomMember {
-            let pdu = match services().rooms.timeline.get_pdu(&id)? {
+            let Some(pdu) = services().rooms.timeline.get_pdu(&id)? else {
-                Some(pdu) => pdu,
-                None => {
                 error!("Pdu in state not found: {}", id);
                 continue;
-                }
             };
             state.push(pdu.to_state_event());
         } else if !lazy_load_enabled || lazy_loaded.contains(&state_key) {
-            let pdu = match services().rooms.timeline.get_pdu(&id)? {
+            let Some(pdu) = services().rooms.timeline.get_pdu(&id)? else {
-                Some(pdu) => pdu,
-                None => {
                 error!("Pdu in state not found: {}", id);
                 continue;
-                }
             };
             state.push(pdu.to_state_event());
         }

src/api/client_server/device.rs

@@ -83,7 +83,7 @@ pub async fn delete_device_route(
             stages: vec![AuthType::Password],
         }],
         completed: Vec::new(),
-        params: Default::default(),
+        params: Box::default(),
         session: None,
         auth_error: None,
     };
@@ -137,7 +137,7 @@ pub async fn delete_devices_route(
             stages: vec![AuthType::Password],
         }],
         completed: Vec::new(),
-        params: Default::default(),
+        params: Box::default(),
         session: None,
         auth_error: None,
     };
@@ -162,7 +162,7 @@ pub async fn delete_devices_route(
     }
 
     for device_id in &body.devices {
-        services().users.remove_device(sender_user, device_id)?
+        services().users.remove_device(sender_user, device_id)?;
     }
 
     Ok(delete_devices::v3::Response {})

src/api/client_server/filter.rs

@@ -13,9 +13,8 @@ pub async fn get_filter_route(
     body: Ruma<get_filter::v3::Request>,
 ) -> Result<get_filter::v3::Response> {
     let sender_user = body.sender_user.as_ref().expect("user is authenticated");
-    let filter = match services().users.get_filter(sender_user, &body.filter_id)? {
+    let Some(filter) = services().users.get_filter(sender_user, &body.filter_id)? else {
-        Some(filter) => filter,
+        return Err(Error::BadRequest(ErrorKind::NotFound, "Filter not found."));
-        None => return Err(Error::BadRequest(ErrorKind::NotFound, "Filter not found.")),
     };
 
     Ok(get_filter::v3::Response::new(filter))

src/api/client_server/keys.rs

@@ -106,7 +106,7 @@ pub async fn upload_signing_keys_route(
             stages: vec![AuthType::Password],
         }],
         completed: Vec::new(),
-        params: Default::default(),
+        params: Box::default(),
         session: None,
         auth_error: None,
     };
@@ -173,7 +173,6 @@ pub async fn upload_signatures_route(
                     "Invalid signature.",
                 ))?
                 .clone()
-                .into_iter()
             {
                 // Signature validation?
                 let signature = (
@@ -401,8 +400,7 @@ pub(crate) async fn get_keys_helper<F: Fn(&UserId) -> bool>(
         .collect();
 
     while let Some((server, response)) = futures.next().await {
-        match response {
+        if let Ok(Ok(response)) = response {
-            Ok(Ok(response)) => {
             for (user, masterkey) in response.master_keys {
                 let (master_key_id, mut master_key) =
                     services().users.parse_master_key(&user, &masterkey)?;
@@ -428,21 +426,19 @@ pub(crate) async fn get_keys_helper<F: Fn(&UserId) -> bool>(
 
             self_signing_keys.extend(response.self_signing_keys);
             device_keys.extend(response.device_keys);
-            }
+        } else {
-            _ => {
             back_off(server.to_owned()).await;
 
             failures.insert(server.to_string(), json!({}));
         }
     }
-    }
 
     Ok(get_keys::v3::Response {
+        failures,
+        device_keys,
         master_keys,
         self_signing_keys,
         user_signing_keys,
-        device_keys,
-        failures,
     })
 }
 

src/api/client_server/membership.rs

@@ -59,7 +59,7 @@ pub async fn join_room_by_id_route(
             .iter()
             .filter_map(|event| serde_json::from_str(event.json().get()).ok())
             .filter_map(|event: serde_json::Value| event.get("sender").cloned())
-            .filter_map(|sender| sender.as_str().map(|s| s.to_owned()))
+            .filter_map(|sender| sender.as_str().map(ToOwned::to_owned))
             .filter_map(|sender| UserId::parse(sender).ok())
             .map(|user| user.server_name().to_owned()),
     );
@@ -105,7 +105,7 @@ pub async fn join_room_by_id_or_alias_route(
                     .iter()
                     .filter_map(|event| serde_json::from_str(event.json().get()).ok())
                     .filter_map(|event: serde_json::Value| event.get("sender").cloned())
-                    .filter_map(|sender| sender.as_str().map(|s| s.to_owned()))
+                    .filter_map(|sender| sender.as_str().map(ToOwned::to_owned))
                     .filter_map(|sender| UserId::parse(sender).ok())
                     .map(|user| user.server_name().to_owned()),
             );
@@ -543,313 +543,11 @@ async fn join_room_by_id_helper(
     let state_lock = mutex_state.lock().await;
 
     // Ask a remote server if we are not participating in this room
-    if !services()
+    if services()
         .rooms
         .state_cache
         .server_in_room(services().globals.server_name(), room_id)?
     {
-        info!("Joining {room_id} over federation.");
-
-        let (make_join_response, remote_server) =
-            make_join_request(sender_user, room_id, servers).await?;
-
-        info!("make_join finished");
-
-        let room_version_id = match make_join_response.room_version {
-            Some(room_version)
-                if services()
-                    .globals
-                    .supported_room_versions()
-                    .contains(&room_version) =>
-            {
-                room_version
-            }
-            _ => return Err(Error::BadServerResponse("Room version is not supported")),
-        };
-
-        let mut join_event_stub: CanonicalJsonObject =
-            serde_json::from_str(make_join_response.event.get()).map_err(|_| {
-                Error::BadServerResponse("Invalid make_join event json received from server.")
-            })?;
-
-        let join_authorized_via_users_server = join_event_stub
-            .get("content")
-            .map(|s| {
-                s.as_object()?
-                    .get("join_authorised_via_users_server")?
-                    .as_str()
-            })
-            .and_then(|s| OwnedUserId::try_from(s.unwrap_or_default()).ok());
-
-        // TODO: Is origin needed?
-        join_event_stub.insert(
-            "origin".to_owned(),
-            CanonicalJsonValue::String(services().globals.server_name().as_str().to_owned()),
-        );
-        join_event_stub.insert(
-            "origin_server_ts".to_owned(),
-            CanonicalJsonValue::Integer(
-                utils::millis_since_unix_epoch()
-                    .try_into()
-                    .expect("Timestamp is valid js_int value"),
-            ),
-        );
-        join_event_stub.insert(
-            "content".to_owned(),
-            to_canonical_value(RoomMemberEventContent {
-                membership: MembershipState::Join,
-                displayname: services().users.displayname(sender_user)?,
-                avatar_url: services().users.avatar_url(sender_user)?,
-                is_direct: None,
-                third_party_invite: None,
-                blurhash: services().users.blurhash(sender_user)?,
-                reason,
-                join_authorized_via_users_server,
-            })
-            .expect("event is valid, we just created it"),
-        );
-
-        // We don't leave the event id in the pdu because that's only allowed in v1 or v2 rooms
-        join_event_stub.remove("event_id");
-
-        // In order to create a compatible ref hash (EventID) the `hashes` field needs to be present
-        ruma::signatures::hash_and_sign_event(
-            services().globals.server_name().as_str(),
-            services().globals.keypair(),
-            &mut join_event_stub,
-            &room_version_id,
-        )
-        .expect("event is valid, we just created it");
-
-        // Generate event id
-        let event_id = format!(
-            "${}",
-            ruma::signatures::reference_hash(&join_event_stub, &room_version_id)
-                .expect("ruma can calculate reference hashes")
-        );
-        let event_id = <&EventId>::try_from(event_id.as_str())
-            .expect("ruma's reference hashes are valid event ids");
-
-        // Add event_id back
-        join_event_stub.insert(
-            "event_id".to_owned(),
-            CanonicalJsonValue::String(event_id.as_str().to_owned()),
-        );
-
-        // It has enough fields to be called a proper event now
-        let mut join_event = join_event_stub;
-
-        info!("Asking {remote_server} for send_join");
-        let send_join_response = services()
-            .sending
-            .send_federation_request(
-                &remote_server,
-                federation::membership::create_join_event::v2::Request {
-                    room_id: room_id.to_owned(),
-                    event_id: event_id.to_owned(),
-                    pdu: PduEvent::convert_to_outgoing_federation_event(join_event.clone()),
-                    omit_members: false,
-                },
-            )
-            .await?;
-
-        info!("send_join finished");
-
-        if let Some(signed_raw) = &send_join_response.room_state.event {
-            info!("There is a signed event. This room is probably using restricted joins. Adding signature to our event");
-            let (signed_event_id, signed_value) =
-                match gen_event_id_canonical_json(signed_raw, &room_version_id) {
-                    Ok(t) => t,
-                    Err(_) => {
-                        // Event could not be converted to canonical json
-                        return Err(Error::BadRequest(
-                            ErrorKind::InvalidParam,
-                            "Could not convert event to canonical json.",
-                        ));
-                    }
-                };
-
-            if signed_event_id != event_id {
-                return Err(Error::BadRequest(
-                    ErrorKind::InvalidParam,
-                    "Server sent event with wrong event id",
-                ));
-            }
-
-            match signed_value["signatures"]
-                .as_object()
-                .ok_or(Error::BadRequest(
-                    ErrorKind::InvalidParam,
-                    "Server sent invalid signatures type",
-                ))
-                .and_then(|e| {
-                    e.get(remote_server.as_str()).ok_or(Error::BadRequest(
-                        ErrorKind::InvalidParam,
-                        "Server did not send its signature",
-                    ))
-                }) {
-                Ok(signature) => {
-                    join_event
-                        .get_mut("signatures")
-                        .expect("we created a valid pdu")
-                        .as_object_mut()
-                        .expect("we created a valid pdu")
-                        .insert(remote_server.to_string(), signature.clone());
-                }
-                Err(e) => {
-                    warn!(
-                        "Server {remote_server} sent invalid signature in sendjoin signatures for event {signed_value:?}: {e:?}",
-                    );
-                }
-            }
-        }
-
-        services().rooms.short.get_or_create_shortroomid(room_id)?;
-
-        info!("Parsing join event");
-        let parsed_join_pdu = PduEvent::from_id_val(event_id, join_event.clone())
-            .map_err(|_| Error::BadServerResponse("Invalid join event PDU."))?;
-
-        let mut state = HashMap::new();
-        let pub_key_map = RwLock::new(BTreeMap::new());
-
-        info!("Fetching join signing keys");
-        services()
-            .rooms
-            .event_handler
-            .fetch_join_signing_keys(&send_join_response, &room_version_id, &pub_key_map)
-            .await?;
-
-        info!("Going through send_join response room_state");
-        for result in send_join_response
-            .room_state
-            .state
-            .iter()
-            .map(|pdu| validate_and_add_event_id(pdu, &room_version_id, &pub_key_map))
-        {
-            let (event_id, value) = match result.await {
-                Ok(t) => t,
-                Err(_) => continue,
-            };
-
-            let pdu = PduEvent::from_id_val(&event_id, value.clone()).map_err(|e| {
-                warn!("Invalid PDU in send_join response: {} {:?}", e, value);
-                Error::BadServerResponse("Invalid PDU in send_join response.")
-            })?;
-
-            services()
-                .rooms
-                .outlier
-                .add_pdu_outlier(&event_id, &value)?;
-            if let Some(state_key) = &pdu.state_key {
-                let shortstatekey = services()
-                    .rooms
-                    .short
-                    .get_or_create_shortstatekey(&pdu.kind.to_string().into(), state_key)?;
-                state.insert(shortstatekey, pdu.event_id.clone());
-            }
-        }
-
-        info!("Going through send_join response auth_chain");
-        for result in send_join_response
-            .room_state
-            .auth_chain
-            .iter()
-            .map(|pdu| validate_and_add_event_id(pdu, &room_version_id, &pub_key_map))
-        {
-            let (event_id, value) = match result.await {
-                Ok(t) => t,
-                Err(_) => continue,
-            };
-
-            services()
-                .rooms
-                .outlier
-                .add_pdu_outlier(&event_id, &value)?;
-        }
-
-        info!("Running send_join auth check");
-        let authenticated = state_res::event_auth::auth_check(
-            &state_res::RoomVersion::new(&room_version_id).expect("room version is supported"),
-            &parsed_join_pdu,
-            None::<PduEvent>, // TODO: third party invite
-            |k, s| {
-                services()
-                    .rooms
-                    .timeline
-                    .get_pdu(
-                        state.get(
-                            &services()
-                                .rooms
-                                .short
-                                .get_or_create_shortstatekey(&k.to_string().into(), s)
-                                .ok()?,
-                        )?,
-                    )
-                    .ok()?
-            },
-        )
-        .map_err(|e| {
-            warn!("Auth check failed: {e}");
-            Error::BadRequest(ErrorKind::InvalidParam, "Auth check failed")
-        })?;
-
-        if !authenticated {
-            return Err(Error::BadRequest(
-                ErrorKind::InvalidParam,
-                "Auth check failed",
-            ));
-        }
-
-        info!("Saving state from send_join");
-        let (statehash_before_join, new, removed) = services().rooms.state_compressor.save_state(
-            room_id,
-            Arc::new(
-                state
-                    .into_iter()
-                    .map(|(k, id)| {
-                        services()
-                            .rooms
-                            .state_compressor
-                            .compress_state_event(k, &id)
-                    })
-                    .collect::<Result<_>>()?,
-            ),
-        )?;
-
-        services()
-            .rooms
-            .state
-            .force_state(room_id, statehash_before_join, new, removed, &state_lock)
-            .await?;
-
-        info!("Updating joined counts for new room");
-        services().rooms.state_cache.update_joined_count(room_id)?;
-
-        // We append to state before appending the pdu, so we don't have a moment in time with the
-        // pdu without it's state. This is okay because append_pdu can't fail.
-        let statehash_after_join = services().rooms.state.append_to_state(&parsed_join_pdu)?;
-
-        info!("Appending new room join event");
-        services()
-            .rooms
-            .timeline
-            .append_pdu(
-                &parsed_join_pdu,
-                join_event,
-                vec![(*parsed_join_pdu.event_id).to_owned()],
-                &state_lock,
-            )
-            .await?;
-
-        info!("Setting final room state for new room");
-        // We set the room state after inserting the pdu, so that we never have a moment in time
-        // where events in the current room state do not exist
-        services()
-            .rooms
-            .state
-            .set_room_state(room_id, statehash_after_join, &state_lock)?;
-    } else {
         info!("We can join locally");
 
         let join_rules_event = services().rooms.state_accessor.room_state_get(
@@ -870,10 +568,7 @@ async fn join_room_by_id_helper(
 
         let restriction_rooms = match join_rules_event_content {
             Some(RoomJoinRulesEventContent {
-                join_rule: JoinRule::Restricted(restricted),
+                join_rule: JoinRule::Restricted(restricted) | JoinRule::KnockRestricted(restricted),
-            })
-            | Some(RoomJoinRulesEventContent {
-                join_rule: JoinRule::KnockRestricted(restricted),
             }) => restricted
                 .allow
                 .into_iter()
@@ -901,12 +596,12 @@ async fn join_room_by_id_helper(
                 .collect::<Vec<_>>()
             {
                 if user.server_name() == services().globals.server_name()
-                    && services()
+                    && services().rooms.state_accessor.user_can_invite(
-                        .rooms
+                        room_id,
-                        .state_accessor
+                        &user,
-                        .user_can_invite(room_id, &user, sender_user, &state_lock)
+                        sender_user,
-                        .await
+                        &state_lock,
-                        .unwrap_or(false)
+                    )
                 {
                     auth_user = Some(user);
                     break;
@@ -1056,16 +751,14 @@ async fn join_room_by_id_helper(
                 .await?;
 
             if let Some(signed_raw) = send_join_response.room_state.event {
-                let (signed_event_id, signed_value) =
+                let Ok((signed_event_id, signed_value)) =
-                    match gen_event_id_canonical_json(&signed_raw, &room_version_id) {
+                    gen_event_id_canonical_json(&signed_raw, &room_version_id)
-                        Ok(t) => t,
+                else {
-                        Err(_) => {
                     // Event could not be converted to canonical json
                     return Err(Error::BadRequest(
                         ErrorKind::InvalidParam,
                         "Could not convert event to canonical json.",
                     ));
-                        }
                 };
 
                 if signed_event_id != event_id {
@@ -1095,6 +788,304 @@ async fn join_room_by_id_helper(
         } else {
             return Err(error);
         }
+    } else {
+        info!("Joining {room_id} over federation.");
+
+        let (make_join_response, remote_server) =
+            make_join_request(sender_user, room_id, servers).await?;
+
+        info!("make_join finished");
+
+        let room_version_id = match make_join_response.room_version {
+            Some(room_version)
+                if services()
+                    .globals
+                    .supported_room_versions()
+                    .contains(&room_version) =>
+            {
+                room_version
+            }
+            _ => return Err(Error::BadServerResponse("Room version is not supported")),
+        };
+
+        let mut join_event_stub: CanonicalJsonObject =
+            serde_json::from_str(make_join_response.event.get()).map_err(|_| {
+                Error::BadServerResponse("Invalid make_join event json received from server.")
+            })?;
+
+        let join_authorized_via_users_server = join_event_stub
+            .get("content")
+            .map(|s| {
+                s.as_object()?
+                    .get("join_authorised_via_users_server")?
+                    .as_str()
+            })
+            .and_then(|s| OwnedUserId::try_from(s.unwrap_or_default()).ok());
+
+        // TODO: Is origin needed?
+        join_event_stub.insert(
+            "origin".to_owned(),
+            CanonicalJsonValue::String(services().globals.server_name().as_str().to_owned()),
+        );
+        join_event_stub.insert(
+            "origin_server_ts".to_owned(),
+            CanonicalJsonValue::Integer(
+                utils::millis_since_unix_epoch()
+                    .try_into()
+                    .expect("Timestamp is valid js_int value"),
+            ),
+        );
+        join_event_stub.insert(
+            "content".to_owned(),
+            to_canonical_value(RoomMemberEventContent {
+                membership: MembershipState::Join,
+                displayname: services().users.displayname(sender_user)?,
+                avatar_url: services().users.avatar_url(sender_user)?,
+                is_direct: None,
+                third_party_invite: None,
+                blurhash: services().users.blurhash(sender_user)?,
+                reason,
+                join_authorized_via_users_server,
+            })
+            .expect("event is valid, we just created it"),
+        );
+
+        // We don't leave the event id in the pdu because that's only allowed in v1 or v2 rooms
+        join_event_stub.remove("event_id");
+
+        // In order to create a compatible ref hash (EventID) the `hashes` field needs to be present
+        ruma::signatures::hash_and_sign_event(
+            services().globals.server_name().as_str(),
+            services().globals.keypair(),
+            &mut join_event_stub,
+            &room_version_id,
+        )
+        .expect("event is valid, we just created it");
+
+        // Generate event id
+        let event_id = format!(
+            "${}",
+            ruma::signatures::reference_hash(&join_event_stub, &room_version_id)
+                .expect("ruma can calculate reference hashes")
+        );
+        let event_id = <&EventId>::try_from(event_id.as_str())
+            .expect("ruma's reference hashes are valid event ids");
+
+        // Add event_id back
+        join_event_stub.insert(
+            "event_id".to_owned(),
+            CanonicalJsonValue::String(event_id.as_str().to_owned()),
+        );
+
+        // It has enough fields to be called a proper event now
+        let mut join_event = join_event_stub;
+
+        info!("Asking {remote_server} for send_join");
+        let send_join_response = services()
+            .sending
+            .send_federation_request(
+                &remote_server,
+                federation::membership::create_join_event::v2::Request {
+                    room_id: room_id.to_owned(),
+                    event_id: event_id.to_owned(),
+                    pdu: PduEvent::convert_to_outgoing_federation_event(join_event.clone()),
+                    omit_members: false,
+                },
+            )
+            .await?;
+
+        info!("send_join finished");
+
+        if let Some(signed_raw) = &send_join_response.room_state.event {
+            info!("There is a signed event. This room is probably using restricted joins. Adding signature to our event");
+            let Ok((signed_event_id, signed_value)) =
+                gen_event_id_canonical_json(signed_raw, &room_version_id)
+            else {
+                // Event could not be converted to canonical json
+                return Err(Error::BadRequest(
+                    ErrorKind::InvalidParam,
+                    "Could not convert event to canonical json.",
+                ));
+            };
+
+            if signed_event_id != event_id {
+                return Err(Error::BadRequest(
+                    ErrorKind::InvalidParam,
+                    "Server sent event with wrong event id",
+                ));
+            }
+
+            match signed_value["signatures"]
+                .as_object()
+                .ok_or(Error::BadRequest(
+                    ErrorKind::InvalidParam,
+                    "Server sent invalid signatures type",
+                ))
+                .and_then(|e| {
+                    e.get(remote_server.as_str()).ok_or(Error::BadRequest(
+                        ErrorKind::InvalidParam,
+                        "Server did not send its signature",
+                    ))
+                }) {
+                Ok(signature) => {
+                    join_event
+                        .get_mut("signatures")
+                        .expect("we created a valid pdu")
+                        .as_object_mut()
+                        .expect("we created a valid pdu")
+                        .insert(remote_server.to_string(), signature.clone());
+                }
+                Err(e) => {
+                    warn!(
+                        "Server {remote_server} sent invalid signature in sendjoin signatures for event {signed_value:?}: {e:?}",
+                    );
+                }
+            }
+        }
+
+        services().rooms.short.get_or_create_shortroomid(room_id)?;
+
+        info!("Parsing join event");
+        let parsed_join_pdu = PduEvent::from_id_val(event_id, join_event.clone())
+            .map_err(|_| Error::BadServerResponse("Invalid join event PDU."))?;
+
+        let mut state = HashMap::new();
+        let pub_key_map = RwLock::new(BTreeMap::new());
+
+        info!("Fetching join signing keys");
+        services()
+            .rooms
+            .event_handler
+            .fetch_join_signing_keys(&send_join_response, &room_version_id, &pub_key_map)
+            .await?;
+
+        info!("Going through send_join response room_state");
+        for result in send_join_response
+            .room_state
+            .state
+            .iter()
+            .map(|pdu| validate_and_add_event_id(pdu, &room_version_id, &pub_key_map))
+        {
+            let Ok((event_id, value)) = result.await else {
+                continue;
+            };
+
+            let pdu = PduEvent::from_id_val(&event_id, value.clone()).map_err(|e| {
+                warn!("Invalid PDU in send_join response: {} {:?}", e, value);
+                Error::BadServerResponse("Invalid PDU in send_join response.")
+            })?;
+
+            services()
+                .rooms
+                .outlier
+                .add_pdu_outlier(&event_id, &value)?;
+            if let Some(state_key) = &pdu.state_key {
+                let shortstatekey = services()
+                    .rooms
+                    .short
+                    .get_or_create_shortstatekey(&pdu.kind.to_string().into(), state_key)?;
+                state.insert(shortstatekey, pdu.event_id.clone());
+            }
+        }
+
+        info!("Going through send_join response auth_chain");
+        for result in send_join_response
+            .room_state
+            .auth_chain
+            .iter()
+            .map(|pdu| validate_and_add_event_id(pdu, &room_version_id, &pub_key_map))
+        {
+            let Ok((event_id, value)) = result.await else {
+                continue;
+            };
+
+            services()
+                .rooms
+                .outlier
+                .add_pdu_outlier(&event_id, &value)?;
+        }
+
+        info!("Running send_join auth check");
+        let authenticated = state_res::event_auth::auth_check(
+            &state_res::RoomVersion::new(&room_version_id).expect("room version is supported"),
+            &parsed_join_pdu,
+            None::<PduEvent>, // TODO: third party invite
+            |k, s| {
+                services()
+                    .rooms
+                    .timeline
+                    .get_pdu(
+                        state.get(
+                            &services()
+                                .rooms
+                                .short
+                                .get_or_create_shortstatekey(&k.to_string().into(), s)
+                                .ok()?,
+                        )?,
+                    )
+                    .ok()?
+            },
+        )
+        .map_err(|e| {
+            warn!("Auth check failed: {e}");
+            Error::BadRequest(ErrorKind::InvalidParam, "Auth check failed")
+        })?;
+
+        if !authenticated {
+            return Err(Error::BadRequest(
+                ErrorKind::InvalidParam,
+                "Auth check failed",
+            ));
+        }
+
+        info!("Saving state from send_join");
+        let (statehash_before_join, new, removed) = services().rooms.state_compressor.save_state(
+            room_id,
+            Arc::new(
+                state
+                    .into_iter()
+                    .map(|(k, id)| {
+                        services()
+                            .rooms
+                            .state_compressor
+                            .compress_state_event(k, &id)
+                    })
+                    .collect::<Result<_>>()?,
+            ),
+        )?;
+
+        services()
+            .rooms
+            .state
+            .force_state(room_id, statehash_before_join, new, removed, &state_lock)
+            .await?;
+
+        info!("Updating joined counts for new room");
+        services().rooms.state_cache.update_joined_count(room_id)?;
+
+        // We append to state before appending the pdu, so we don't have a moment in time with the
+        // pdu without it's state. This is okay because append_pdu can't fail.
+        let statehash_after_join = services().rooms.state.append_to_state(&parsed_join_pdu)?;
+
+        info!("Appending new room join event");
+        services()
+            .rooms
+            .timeline
+            .append_pdu(
+                &parsed_join_pdu,
+                join_event,
+                vec![(*parsed_join_pdu.event_id).to_owned()],
+                &state_lock,
+            )
+            .await?;
+
+        info!("Setting final room state for new room");
+        // We set the room state after inserting the pdu, so that we never have a moment in time
+        // where events in the current room state do not exist
+        services()
+            .rooms
+            .state
+            .set_room_state(room_id, statehash_after_join, &state_lock)?;
     }
 
     Ok(join_room_by_id::v3::Response::new(room_id.to_owned()))
@@ -1275,16 +1266,13 @@ pub(crate) async fn invite_helper<'a>(
         let pub_key_map = RwLock::new(BTreeMap::new());
 
         // We do not add the event_id field to the pdu here because of signature and hashes checks
-        let (event_id, value) = match gen_event_id_canonical_json(&response.event, &room_version_id)
+        let Ok((event_id, value)) = gen_event_id_canonical_json(&response.event, &room_version_id)
-        {
+        else {
-            Ok(t) => t,
-            Err(_) => {
             // Event could not be converted to canonical json
             return Err(Error::BadRequest(
                 ErrorKind::InvalidParam,
                 "Could not convert event to canonical json.",
             ));
-            }
         };
 
         if *pdu.event_id != *event_id {
@@ -1393,10 +1381,7 @@ pub async fn leave_all_rooms(user_id: &UserId) -> Result<()> {
         .collect::<Vec<_>>();
 
     for room_id in all_rooms {
-        let room_id = match room_id {
+        let Ok(room_id) = room_id else { continue };
-            Ok(room_id) => room_id,
-            Err(_) => continue,
-        };
 
         let _ = leave_room(user_id, &room_id, None).await;
     }
@@ -1406,35 +1391,11 @@ pub async fn leave_all_rooms(user_id: &UserId) -> Result<()> {
 
 pub async fn leave_room(user_id: &UserId, room_id: &RoomId, reason: Option<String>) -> Result<()> {
     // Ask a remote server if we don't have this room
-    if !services()
+    if services()
         .rooms
         .state_cache
         .server_in_room(services().globals.server_name(), room_id)?
     {
-        if let Err(e) = remote_leave_room(user_id, room_id).await {
-            warn!("Failed to leave room {} remotely: {}", user_id, e);
-            // Don't tell the client about this error
-        }
-
-        let last_state = services()
-            .rooms
-            .state_cache
-            .invite_state(user_id, room_id)?
-            .map_or_else(
-                || services().rooms.state_cache.left_state(user_id, room_id),
-                |s| Ok(Some(s)),
-            )?;
-
-        // We always drop the invite, we can't rely on other servers
-        services().rooms.state_cache.update_membership(
-            room_id,
-            user_id,
-            MembershipState::Leave,
-            user_id,
-            last_state,
-            true,
-        )?;
-    } else {
         let mutex_state = Arc::clone(
             services()
                 .globals
@@ -1493,6 +1454,30 @@ pub async fn leave_room(user_id: &UserId, room_id: &RoomId, reason: Option<Strin
                 &state_lock,
             )
             .await?;
+    } else {
+        if let Err(e) = remote_leave_room(user_id, room_id).await {
+            warn!("Failed to leave room {} remotely: {}", user_id, e);
+            // Don't tell the client about this error
+        }
+
+        let last_state = services()
+            .rooms
+            .state_cache
+            .invite_state(user_id, room_id)?
+            .map_or_else(
+                || services().rooms.state_cache.left_state(user_id, room_id),
+                |s| Ok(Some(s)),
+            )?;
+
+        // We always drop the invite, we can't rely on other servers
+        services().rooms.state_cache.update_membership(
+            room_id,
+            user_id,
+            MembershipState::Leave,
+            user_id,
+            last_state,
+            true,
+        )?;
     }
 
     Ok(())
@@ -1516,7 +1501,7 @@ async fn remote_leave_room(user_id: &UserId, room_id: &RoomId) -> Result<()> {
         .iter()
         .filter_map(|event| serde_json::from_str(event.json().get()).ok())
         .filter_map(|event: serde_json::Value| event.get("sender").cloned())
-        .filter_map(|sender| sender.as_str().map(|s| s.to_owned()))
+        .filter_map(|sender| sender.as_str().map(ToOwned::to_owned))
         .filter_map(|sender| UserId::parse(sender).ok())
         .map(|user| user.server_name().to_owned())
         .collect();

src/api/client_server/message.rs

@@ -110,7 +110,7 @@ pub async fn send_message_event_route(
 /// Allows paginating through room history.
 ///
 /// - Only works if the user is joined (TODO: always allow, but only show events where the user was
-/// joined, depending on history_visibility)
+/// joined, depending on `history_visibility`)
 pub async fn get_message_events_route(
     body: Ruma<get_message_events::v3::Request>,
 ) -> Result<get_message_events::v3::Response> {

src/api/client_server/profile.rs

@@ -147,7 +147,7 @@ pub async fn get_displayname_route(
 
 /// # `PUT /_matrix/client/r0/profile/{userId}/avatar_url`
 ///
-/// Updates the avatar_url and blurhash.
+/// Updates the `avatar_url` and blurhash.
 ///
 /// - Also makes sure other users receive the update using presence EDUs
 pub async fn set_avatar_url_route(
@@ -252,9 +252,9 @@ pub async fn set_avatar_url_route(
 
 /// # `GET /_matrix/client/r0/profile/{userId}/avatar_url`
 ///
-/// Returns the avatar_url and blurhash of the user.
+/// Returns the `avatar_url` and blurhash of the user.
 ///
-/// - If user is on another server: Fetches avatar_url and blurhash over federation
+/// - If user is on another server: Fetches `avatar_url` and blurhash over federation
 pub async fn get_avatar_url_route(
     body: Ruma<get_avatar_url::v3::Request>,
 ) -> Result<get_avatar_url::v3::Response> {
@@ -284,7 +284,7 @@ pub async fn get_avatar_url_route(
 
 /// # `GET /_matrix/client/r0/profile/{userId}`
 ///
-/// Returns the displayname, avatar_url and blurhash of the user.
+/// Returns the displayname, `avatar_url` and blurhash of the user.
 ///
 /// - If user is on another server: Fetches profile over federation
 pub async fn get_profile_route(

src/api/client_server/push.rs

@@ -281,7 +281,7 @@ pub async fn get_pushrule_enabled_route(
     let global = account_data.content.global;
     let enabled = global
         .get(body.kind.clone(), &body.rule_id)
-        .map(|r| r.enabled())
+        .map(ruma::push::AnyPushRuleRef::enabled)
         .ok_or(Error::BadRequest(
             ErrorKind::NotFound,
             "Push rule not found.",

src/api/client_server/read_marker.rs

@@ -140,7 +140,7 @@ pub async fn create_receipt_route(
             receipts.insert(ReceiptType::Read, user_receipts);
 
             let mut receipt_content = BTreeMap::new();
-            receipt_content.insert(body.event_id.to_owned(), receipts);
+            receipt_content.insert(body.event_id.clone(), receipts);
 
             services().rooms.edus.read_receipt.readreceipt_update(
                 sender_user,

src/api/client_server/relations.rs

@@ -39,8 +39,8 @@ pub async fn get_relating_events_with_rel_type_and_event_type_route(
             sender_user,
             &body.room_id,
             &body.event_id,
-            Some(body.event_type.clone()),
+            &Some(body.event_type.clone()),
-            Some(body.rel_type.clone()),
+            &Some(body.rel_type.clone()),
             from,
             to,
             limit,
@@ -89,8 +89,8 @@ pub async fn get_relating_events_with_rel_type_route(
             sender_user,
             &body.room_id,
             &body.event_id,
-            None,
+            &None,
-            Some(body.rel_type.clone()),
+            &Some(body.rel_type.clone()),
             from,
             to,
             limit,
@@ -137,8 +137,8 @@ pub async fn get_relating_events_route(
             sender_user,
             &body.room_id,
             &body.event_id,
-            None,
+            &None,
-            None,
+            &None,
             from,
             to,
             limit,

src/api/client_server/report.rs

@@ -14,14 +14,11 @@ pub async fn report_event_route(
 ) -> Result<report_content::v3::Response> {
     let sender_user = body.sender_user.as_ref().expect("user is authenticated");
 
-    let pdu = match services().rooms.timeline.get_pdu(&body.event_id)? {
+    let Some(pdu) = services().rooms.timeline.get_pdu(&body.event_id)? else {
-        Some(pdu) => pdu,
-        _ => {
         return Err(Error::BadRequest(
             ErrorKind::InvalidParam,
             "Invalid Event ID",
-            ))
+        ));
-        }
     };
 
     if let Some(true) = body.score.map(|s| s > int!(0) || s < int!(-100)) {

src/api/client_server/room.rs

@@ -34,7 +34,7 @@ use tracing::{info, warn};
 /// Creates a new room.
 ///
 /// - Room ID is randomly generated
-/// - Create alias if room_alias_name is set
+/// - Create alias if `room_alias_name` is set
 /// - Send create event
 /// - Join sender user
 /// - Send power levels event
@@ -228,7 +228,7 @@ pub async fn create_room_route(
                 event_type: TimelineEventType::RoomCreate,
                 content: to_raw_value(&content).expect("event is valid, we just created it"),
                 unsigned: None,
-                state_key: Some("".to_owned()),
+                state_key: Some(String::new()),
                 redacts: None,
             },
             sender_user,
@@ -269,9 +269,10 @@ pub async fn create_room_route(
 
     // Figure out preset. We need it for preset specific events
     let preset = body.preset.clone().unwrap_or(match &body.visibility {
-        room::Visibility::Private => RoomPreset::PrivateChat,
         room::Visibility::Public => RoomPreset::PublicChat,
-        _ => RoomPreset::PrivateChat, // Room visibility should not be custom
+        // Room visibility is set to private, or custom
+        // Room visibility should not be custom
+        _ => RoomPreset::PrivateChat,
     });
 
     let mut users = BTreeMap::new();
@@ -309,7 +310,7 @@ pub async fn create_room_route(
                 content: to_raw_value(&power_levels_content)
                     .expect("to_raw_value always works on serde_json::Value"),
                 unsigned: None,
-                state_key: Some("".to_owned()),
+                state_key: Some(String::new()),
                 redacts: None,
             },
             sender_user,
@@ -332,7 +333,7 @@ pub async fn create_room_route(
                     })
                     .expect("We checked that alias earlier, it must be fine"),
                     unsigned: None,
-                    state_key: Some("".to_owned()),
+                    state_key: Some(String::new()),
                     redacts: None,
                 },
                 sender_user,
@@ -358,7 +359,7 @@ pub async fn create_room_route(
                 }))
                 .expect("event is valid, we just created it"),
                 unsigned: None,
-                state_key: Some("".to_owned()),
+                state_key: Some(String::new()),
                 redacts: None,
             },
             sender_user,
@@ -379,7 +380,7 @@ pub async fn create_room_route(
                 ))
                 .expect("event is valid, we just created it"),
                 unsigned: None,
-                state_key: Some("".to_owned()),
+                state_key: Some(String::new()),
                 redacts: None,
             },
             sender_user,
@@ -401,7 +402,7 @@ pub async fn create_room_route(
                 }))
                 .expect("event is valid, we just created it"),
                 unsigned: None,
-                state_key: Some("".to_owned()),
+                state_key: Some(String::new()),
                 redacts: None,
             },
             sender_user,
@@ -418,7 +419,7 @@ pub async fn create_room_route(
         })?;
 
         // Implicit state key defaults to ""
-        pdu_builder.state_key.get_or_insert_with(|| "".to_owned());
+        pdu_builder.state_key.get_or_insert_with(String::new);
 
         // Silently skip encryption events if they are not allowed
         if pdu_builder.event_type == TimelineEventType::RoomEncryption
@@ -445,7 +446,7 @@ pub async fn create_room_route(
                     content: to_raw_value(&RoomNameEventContent::new(name.clone()))
                         .expect("event is valid, we just created it"),
                     unsigned: None,
-                    state_key: Some("".to_owned()),
+                    state_key: Some(String::new()),
                     redacts: None,
                 },
                 sender_user,
@@ -467,7 +468,7 @@ pub async fn create_room_route(
                     })
                     .expect("event is valid, we just created it"),
                     unsigned: None,
-                    state_key: Some("".to_owned()),
+                    state_key: Some(String::new()),
                     redacts: None,
                 },
                 sender_user,
@@ -539,7 +540,7 @@ pub async fn get_room_event_route(
 ///
 /// Lists all aliases of the room.
 ///
-/// - Only users joined to the room are allowed to call this TODO: Allow any user to call it if history_visibility is world readable
+/// - Only users joined to the room are allowed to call this TODO: Allow any user to call it if `history_visibility` is world readable
 pub async fn get_room_aliases_route(
     body: Ruma<aliases::v3::Request>,
 ) -> Result<aliases::v3::Response> {
@@ -624,7 +625,7 @@ pub async fn upgrade_room_route(
                 })
                 .expect("event is valid, we just created it"),
                 unsigned: None,
-                state_key: Some("".to_owned()),
+                state_key: Some(String::new()),
                 redacts: None,
             },
             sender_user,
@@ -725,7 +726,7 @@ pub async fn upgrade_room_route(
                 content: to_raw_value(&create_event_content)
                     .expect("event is valid, we just created it"),
                 unsigned: None,
-                state_key: Some("".to_owned()),
+                state_key: Some(String::new()),
                 redacts: None,
             },
             sender_user,
@@ -795,7 +796,7 @@ pub async fn upgrade_room_route(
                     event_type: event_type.to_string().into(),
                     content: event_content,
                     unsigned: None,
-                    state_key: Some("".to_owned()),
+                    state_key: Some(String::new()),
                     redacts: None,
                 },
                 sender_user,
@@ -845,7 +846,7 @@ pub async fn upgrade_room_route(
                 content: to_raw_value(&power_levels_event_content)
                     .expect("event is valid, we just created it"),
                 unsigned: None,
-                state_key: Some("".to_owned()),
+                state_key: Some(String::new()),
                 redacts: None,
             },
             sender_user,

src/api/client_server/session.rs

@@ -3,7 +3,13 @@ use crate::{services, utils, Error, Result, Ruma};
 use ruma::{
     api::client::{
         error::ErrorKind,
-        session::{get_login_types, login, logout, logout_all},
+        session::{
+            get_login_types::{
+                self,
+                v3::{ApplicationServiceLoginType, PasswordLoginType},
+            },
+            login, logout, logout_all,
+        },
         uiaa::UserIdentifier,
     },
     UserId,
@@ -25,8 +31,8 @@ pub async fn get_login_types_route(
     _body: Ruma<get_login_types::v3::Request>,
 ) -> Result<get_login_types::v3::Response> {
     Ok(get_login_types::v3::Response::new(vec![
-        get_login_types::v3::LoginType::Password(Default::default()),
+        get_login_types::v3::LoginType::Password(PasswordLoginType::default()),
-        get_login_types::v3::LoginType::ApplicationService(Default::default()),
+        get_login_types::v3::LoginType::ApplicationService(ApplicationServiceLoginType::default()),
     ]))
 }
 

src/api/client_server/space.rs

@@ -1,7 +1,7 @@
 use crate::{services, Result, Ruma};
 use ruma::api::client::space::get_hierarchy;
 
-/// # `GET /_matrix/client/v1/rooms/{room_id}/hierarchy``
+/// # `GET /_matrix/client/v1/rooms/{room_id}/hierarchy`
 ///
 /// Paginates over the space tree in a depth-first manner to locate child rooms of a given space.
 pub async fn get_hierarchy_route(

src/api/client_server/state.rs

@@ -20,7 +20,7 @@ use tracing::log::warn;
 ///
 /// - The only requirement for the content is that it has to be valid json
 /// - Tries to send the event into the room, auth rules will determine if it is allowed
-/// - If event is new canonical_alias: Rejects if alias is incorrect
+/// - If event is new `canonical_alias`: Rejects if alias is incorrect
 pub async fn send_state_event_for_key_route(
     body: Ruma<send_state_event::v3::Request>,
 ) -> Result<send_state_event::v3::Response> {
@@ -31,7 +31,7 @@ pub async fn send_state_event_for_key_route(
         &body.room_id,
         &body.event_type,
         &body.body.body, // Yes, I hate it too
-        body.state_key.to_owned(),
+        body.state_key.clone(),
     )
     .await?;
 
@@ -45,7 +45,7 @@ pub async fn send_state_event_for_key_route(
 ///
 /// - The only requirement for the content is that it has to be valid json
 /// - Tries to send the event into the room, auth rules will determine if it is allowed
-/// - If event is new canonical_alias: Rejects if alias is incorrect
+/// - If event is new `canonical_alias`: Rejects if alias is incorrect
 pub async fn send_state_event_for_empty_key_route(
     body: Ruma<send_state_event::v3::Request>,
 ) -> Result<RumaResponse<send_state_event::v3::Response>> {
@@ -64,7 +64,7 @@ pub async fn send_state_event_for_empty_key_route(
         &body.room_id,
         &body.event_type.to_string().into(),
         &body.body.body,
-        body.state_key.to_owned(),
+        body.state_key.clone(),
     )
     .await?;
 

src/api/client_server/sync.rs

@@ -62,7 +62,7 @@ use tracing::{error, info};
 /// - If the user was invited after `since`: A subset of the state of the room at the point of the invite
 ///
 /// For left rooms:
-/// - If the user left after `since`: prev_batch token, empty state (TODO: subset of the state at the point of the leave)
+/// - If the user left after `since`: `prev_batch` token, empty state (TODO: subset of the state at the point of the leave)
 ///
 /// - Sync is handled in an async task, multiple requests from the same device with the same
 /// `since` will be cached
@@ -83,7 +83,7 @@ pub async fn sync_events_route(
         Entry::Vacant(v) => {
             let (tx, rx) = tokio::sync::watch::channel(None);
 
-            v.insert((body.since.to_owned(), rx.clone()));
+            v.insert((body.since.clone(), rx.clone()));
 
             tokio::spawn(sync_helper_wrapper(
                 sender_user.clone(),
@@ -95,7 +95,9 @@ pub async fn sync_events_route(
             rx
         }
         Entry::Occupied(mut o) => {
-            if o.get().0 != body.since {
+            if o.get().0 == body.since {
+                o.get().1.clone()
+            } else {
                 let (tx, rx) = tokio::sync::watch::channel(None);
 
                 o.insert((body.since.clone(), rx.clone()));
@@ -110,8 +112,6 @@ pub async fn sync_events_route(
                 ));
 
                 rx
-            } else {
-                o.get().1.clone()
             }
         }
     };
@@ -198,7 +198,7 @@ async fn sync_helper(
         LazyLoadOptions::Enabled {
             include_redundant_members: redundant,
         } => (true, redundant),
-        _ => (false, false),
+        LazyLoadOptions::Disabled => (false, false),
     };
 
     let full_state = body.full_state;
@@ -376,28 +376,23 @@ async fn sync_helper(
             None => HashMap::new(),
         };
 
-        let left_event_id = match services().rooms.state_accessor.room_state_get_id(
+        let Some(left_event_id) = services().rooms.state_accessor.room_state_get_id(
             &room_id,
             &StateEventType::RoomMember,
             sender_user.as_str(),
-        )? {
+        )?
-            Some(e) => e,
+        else {
-            None => {
             error!("Left room but no left state event");
             continue;
-            }
         };
 
-        let left_shortstatehash = match services()
+        let Some(left_shortstatehash) = services()
             .rooms
             .state_accessor
             .pdu_shortstatehash(&left_event_id)?
-        {
+        else {
-            Some(s) => s,
-            None => {
             error!("Leave event has no state");
             continue;
-            }
         };
 
         let mut left_state_ids = services()
@@ -425,12 +420,9 @@ async fn sync_helper(
                     // TODO: Delete the following line when this is resolved: https://github.com/vector-im/element-web/issues/22565
                     || *sender_user == state_key
                 {
-                    let pdu = match services().rooms.timeline.get_pdu(&id)? {
+                    let Some(pdu) = services().rooms.timeline.get_pdu(&id)? else {
-                        Some(pdu) => pdu,
-                        None => {
                         error!("Pdu in state not found: {}", id);
                         continue;
-                        }
                     };
 
                     left_state_events.push(pdu.to_sync_state_event());
@@ -648,10 +640,8 @@ async fn load_joined_room(
 
     // Database queries:
 
-    let current_shortstatehash =
+    let Some(current_shortstatehash) = services().rooms.state.get_room_shortstatehash(room_id)?
-        if let Some(s) = services().rooms.state.get_room_shortstatehash(room_id)? {
+    else {
-            s
-        } else {
         error!("Room {} has no state", room_id);
         return Err(Error::BadDatabase("Room has no state"));
     };
@@ -788,12 +778,9 @@ async fn load_joined_room(
                         .get_statekey_from_short(shortstatekey)?;
 
                     if event_type != StateEventType::RoomMember {
-                        let pdu = match services().rooms.timeline.get_pdu(&id)? {
+                        let Some(pdu) = services().rooms.timeline.get_pdu(&id)? else {
-                            Some(pdu) => pdu,
-                            None => {
                             error!("Pdu in state not found: {}", id);
                             continue;
-                            }
                         };
                         state_events.push(pdu);
 
@@ -807,12 +794,9 @@ async fn load_joined_room(
                 // TODO: Delete the following line when this is resolved: https://github.com/vector-im/element-web/issues/22565
                 || *sender_user == state_key
                     {
-                        let pdu = match services().rooms.timeline.get_pdu(&id)? {
+                        let Some(pdu) = services().rooms.timeline.get_pdu(&id)? else {
-                            Some(pdu) => pdu,
-                            None => {
                             error!("Pdu in state not found: {}", id);
                             continue;
-                            }
                         };
 
                         // This check is in case a bad user ID made it into the database
@@ -877,12 +861,9 @@ async fn load_joined_room(
 
                     for (key, id) in current_state_ids {
                         if full_state || since_state_ids.get(&key) != Some(&id) {
-                            let pdu = match services().rooms.timeline.get_pdu(&id)? {
+                            let Some(pdu) = services().rooms.timeline.get_pdu(&id)? else {
-                                Some(pdu) => pdu,
-                                None => {
                                 error!("Pdu in state not found: {}", id);
                                 continue;
-                                }
                             };
 
                             if pdu.kind == TimelineEventType::RoomMember {
@@ -1248,7 +1229,7 @@ pub async fn sync_events_v4_route(
                 sender_user.clone(),
                 sender_device.clone(),
                 conn_id.clone(),
-            )
+            );
         }
     }
 
@@ -1286,10 +1267,9 @@ pub async fn sync_events_v4_route(
         );
 
         for room_id in &all_joined_rooms {
-            let current_shortstatehash =
+            let Some(current_shortstatehash) =
-                if let Some(s) = services().rooms.state.get_room_shortstatehash(room_id)? {
+                services().rooms.state.get_room_shortstatehash(room_id)?
-                    s
+            else {
-                } else {
                 error!("Room {} has no state", room_id);
                 continue;
             };
@@ -1354,12 +1334,9 @@ pub async fn sync_events_v4_route(
 
                     for (key, id) in current_state_ids {
                         if since_state_ids.get(&key) != Some(&id) {
-                            let pdu = match services().rooms.timeline.get_pdu(&id)? {
+                            let Some(pdu) = services().rooms.timeline.get_pdu(&id)? else {
-                                Some(pdu) => pdu,
-                                None => {
                                 error!("Pdu in state not found: {}", id);
                                 continue;
-                                }
                             };
                             if pdu.kind == TimelineEventType::RoomMember {
                                 if let Some(state_key) = &pdu.state_key {
@@ -1599,10 +1576,10 @@ pub async fn sync_events_v4_route(
                 }))
             })?
             .or_else(|| {
-                if roomsince != &0 {
+                if roomsince == &0 {
-                    Some(roomsince.to_string())
-                } else {
                     None
+                } else {
+                    Some(roomsince.to_string())
                 }
             });
 
@@ -1613,7 +1590,7 @@ pub async fn sync_events_v4_route(
 
         let required_state = required_state_request
             .iter()
-            .flat_map(|state| {
+            .filter_map(|state| {
                 services()
                     .rooms
                     .state_accessor
@@ -1631,7 +1608,7 @@ pub async fn sync_events_v4_route(
             .room_members(room_id)
             .filter_map(|r| r.ok())
             .filter(|member| member != &sender_user)
-            .flat_map(|member| {
+            .filter_map(|member| {
                 services()
                     .rooms
                     .state_accessor

src/api/client_server/tag.rs

@@ -24,18 +24,19 @@ pub async fn update_tag_route(
         RoomAccountDataEventType::Tag,
     )?;
 
-    let mut tags_event = event
+    let mut tags_event = event.map_or_else(
-        .map(|e| {
+        || {
-            serde_json::from_str(e.get())
-                .map_err(|_| Error::bad_database("Invalid account data event in db."))
-        })
-        .unwrap_or_else(|| {
             Ok(TagEvent {
                 content: TagEventContent {
                     tags: BTreeMap::new(),
                 },
             })
-        })?;
+        },
+        |e| {
+            serde_json::from_str(e.get())
+                .map_err(|_| Error::bad_database("Invalid account data event in db."))
+        },
+    )?;
 
     tags_event
         .content
@@ -68,18 +69,19 @@ pub async fn delete_tag_route(
         RoomAccountDataEventType::Tag,
     )?;
 
-    let mut tags_event = event
+    let mut tags_event = event.map_or_else(
-        .map(|e| {
+        || {
-            serde_json::from_str(e.get())
-                .map_err(|_| Error::bad_database("Invalid account data event in db."))
-        })
-        .unwrap_or_else(|| {
             Ok(TagEvent {
                 content: TagEventContent {
                     tags: BTreeMap::new(),
                 },
             })
-        })?;
+        },
+        |e| {
+            serde_json::from_str(e.get())
+                .map_err(|_| Error::bad_database("Invalid account data event in db."))
+        },
+    )?;
 
     tags_event.content.tags.remove(&body.tag.clone().into());
 
@@ -107,18 +109,19 @@ pub async fn get_tags_route(body: Ruma<get_tags::v3::Request>) -> Result<get_tag
         RoomAccountDataEventType::Tag,
     )?;
 
-    let tags_event = event
+    let tags_event = event.map_or_else(
-        .map(|e| {
+        || {
-            serde_json::from_str(e.get())
-                .map_err(|_| Error::bad_database("Invalid account data event in db."))
-        })
-        .unwrap_or_else(|| {
             Ok(TagEvent {
                 content: TagEventContent {
                     tags: BTreeMap::new(),
                 },
             })
-        })?;
+        },
+        |e| {
+            serde_json::from_str(e.get())
+                .map_err(|_| Error::bad_database("Invalid account data event in db."))
+        },
+    )?;
 
     Ok(get_tags::v3::Response {
         tags: tags_event.content.tags,

src/api/client_server/to_device.rs

@@ -63,7 +63,7 @@ pub async fn send_event_to_device_route(
                         event.deserialize_as().map_err(|_| {
                             Error::BadRequest(ErrorKind::InvalidParam, "Event is invalid")
                         })?,
-                    )?
+                    )?;
                 }
 
                 DeviceIdOrAllDevices::AllDevices => {

src/api/client_server/voip.rs

@@ -17,7 +17,12 @@ pub async fn turn_server_route(
 
     let turn_secret = services().globals.turn_secret().clone();
 
-    let (username, password) = if !turn_secret.is_empty() {
+    let (username, password) = if turn_secret.is_empty() {
+        (
+            services().globals.turn_username().clone(),
+            services().globals.turn_password().clone(),
+        )
+    } else {
         let expiry = SecondsSinceUnixEpoch::from_system_time(
             SystemTime::now() + Duration::from_secs(services().globals.turn_ttl()),
         )
@@ -32,11 +37,6 @@ pub async fn turn_server_route(
         let password: String = general_purpose::STANDARD.encode(mac.finalize().into_bytes());
 
         (username, password)
-    } else {
-        (
-            services().globals.turn_username().clone(),
-            services().globals.turn_password().clone(),
-        )
     };
 
     Ok(get_turn_server_info::v3::Response {

src/api/ruma_wrapper/axum.rs

@@ -226,7 +226,7 @@ where
                     let keys_result = services()
                         .rooms
                         .event_handler
-                        .fetch_signing_keys(&x_matrix.origin, vec![x_matrix.key.to_owned()])
+                        .fetch_signing_keys(&x_matrix.origin, vec![x_matrix.key.clone()])
                         .await;
 
                     let keys = match keys_result {
@@ -334,8 +334,8 @@ where
             sender_user,
             sender_device,
             sender_servername,
-            appservice_info,
             json_body,
+            appservice_info,
         })
     }
 }

src/api/server_server.rs

@@ -65,7 +65,7 @@ use tracing::{debug, error, warn};
 /// (colon-plus-port if it was specified).
 ///
 /// Note: A `FedDest::Named` might contain an IP address in string form if there
-/// was no port specified to construct a SocketAddr with.
+/// was no port specified to construct a `SocketAddr` with.
 ///
 /// # Examples:
 /// ```rust
@@ -344,7 +344,7 @@ fn add_port_to_hostname(destination_str: &str) -> FedDest {
     FedDest::Named(host.to_owned(), port.to_owned())
 }
 
-/// Returns: actual_destination, host header
+/// Returns: `actual_destination`, host header
 /// Implemented according to the specification at <https://matrix.org/docs/spec/server_server/r0.1.4#resolving-server-names>
 /// Numbers in comments below refer to bullet points in linked section of specification
 async fn find_actual_destination(destination: &'_ ServerName) -> (FedDest, FedDest) {
@@ -363,8 +363,7 @@ async fn find_actual_destination(destination: &'_ ServerName) -> (FedDest, FedDe
                 FedDest::Named(host.to_owned(), port.to_owned())
             } else {
                 debug!("Requesting well known for {destination}");
-                match request_well_known(destination.as_str()).await {
+                if let Some(delegated_hostname) = request_well_known(destination.as_str()).await {
-                    Some(delegated_hostname) => {
                     debug!("3: A .well-known file is available");
                     hostname = add_port_to_hostname(&delegated_hostname).into_uri_string();
                     match get_ip_with_port(&delegated_hostname) {
@@ -416,11 +415,9 @@ async fn find_actual_destination(destination: &'_ ServerName) -> (FedDest, FedDe
                             }
                         }
                     }
-                    }
+                } else {
-                    None => {
                     debug!("4: No .well-known or an error occured");
-                        match query_srv_record(&destination_str).await {
+                    if let Some(hostname_override) = query_srv_record(&destination_str).await {
-                            Some(hostname_override) => {
                         debug!("4: SRV record found");
                         let force_port = hostname_override.port();
 
@@ -437,10 +434,7 @@ async fn find_actual_destination(destination: &'_ ServerName) -> (FedDest, FedDe
                                 .unwrap()
                                 .insert(
                                     hostname.clone(),
-                                            (
+                                    (override_ip.iter().collect(), force_port.unwrap_or(8448)),
-                                                override_ip.iter().collect(),
-                                                force_port.unwrap_or(8448),
-                                            ),
                                 );
                         } else {
                             warn!("Using SRV record, but could not resolve to IP");
@@ -451,16 +445,13 @@ async fn find_actual_destination(destination: &'_ ServerName) -> (FedDest, FedDe
                         } else {
                             add_port_to_hostname(&hostname)
                         }
-                            }
+                    } else {
-                            None => {
                         debug!("5: No SRV record found");
                         add_port_to_hostname(&destination_str)
                     }
                 }
             }
         }
-            }
-        }
     };
     debug!("Actual destination: {actual_destination:?}");
 
@@ -660,15 +651,12 @@ pub fn parse_incoming_pdu(
 
     let room_version_id = services().rooms.state.get_room_version(&room_id)?;
 
-    let (event_id, value) = match gen_event_id_canonical_json(pdu, &room_version_id) {
+    let Ok((event_id, value)) = gen_event_id_canonical_json(pdu, &room_version_id) else {
-        Ok(t) => t,
-        Err(_) => {
         // Event could not be converted to canonical json
         return Err(Error::BadRequest(
             ErrorKind::InvalidParam,
             "Could not convert event to canonical json.",
         ));
-        }
     };
     Ok((event_id, value, room_id))
 }
@@ -731,7 +719,7 @@ pub async fn send_transaction_message_route(
                 .roomid_mutex_federation
                 .write()
                 .await
-                .entry(room_id.to_owned())
+                .entry(room_id.clone())
                 .or_default(),
         );
         let mutex_lock = mutex.lock().await;
@@ -777,7 +765,6 @@ pub async fn send_transaction_message_route(
         .filter_map(|edu| serde_json::from_str::<Edu>(edu.json().get()).ok())
     {
         match edu {
-            Edu::Presence(_) => {}
             Edu::Receipt(receipt) => {
                 for (room_id, room_updates) in receipt.receipts {
                     for (user_id, user_updates) in room_updates.read {
@@ -881,7 +868,7 @@ pub async fn send_transaction_message_route(
                                             "Event is invalid",
                                         )
                                     })?,
-                                )?
+                                )?;
                             }
 
                             DeviceIdOrAllDevices::AllDevices => {
@@ -929,7 +916,7 @@ pub async fn send_transaction_message_route(
                     )?;
                 }
             }
-            Edu::_Custom(_) => {}
+            Edu::_Custom(_) | Edu::Presence(_) => {}
         }
     }
 
@@ -1278,15 +1265,14 @@ pub async fn get_room_state_route(
 
     Ok(get_room_state::v1::Response {
         auth_chain: auth_chain_ids
-            .filter_map(
+            .filter_map(|id| {
-                |id| match services().rooms.timeline.get_pdu_json(&id).ok()? {
+                if let Some(json) = services().rooms.timeline.get_pdu_json(&id).ok()? {
-                    Some(json) => Some(PduEvent::convert_to_outgoing_federation_event(json)),
+                    Some(PduEvent::convert_to_outgoing_federation_event(json))
-                    None => {
+                } else {
                     error!("Could not find event json for {id} in db.");
                     None
                 }
-                },
+            })
-            )
             .collect(),
         pdus,
     })
@@ -1378,7 +1364,7 @@ pub async fn create_join_event_template_route(
             .roomid_mutex_state
             .write()
             .await
-            .entry(body.room_id.to_owned())
+            .entry(body.room_id.clone())
             .or_default(),
     );
     let state_lock = mutex_state.lock().await;
@@ -1518,15 +1504,12 @@ async fn create_join_event(
 
     // We do not add the event_id field to the pdu here because of signature and hashes checks
     let room_version_id = services().rooms.state.get_room_version(room_id)?;
-    let (event_id, value) = match gen_event_id_canonical_json(pdu, &room_version_id) {
+    let Ok((event_id, value)) = gen_event_id_canonical_json(pdu, &room_version_id) else {
-        Ok(t) => t,
-        Err(_) => {
         // Event could not be converted to canonical json
         return Err(Error::BadRequest(
             ErrorKind::InvalidParam,
             "Could not convert event to canonical json.",
         ));
-        }
     };
 
     let origin: OwnedServerName = serde_json::from_value(
@@ -1841,11 +1824,11 @@ pub async fn get_profile_information_route(
 
     match &body.field {
         Some(ProfileField::DisplayName) => {
-            displayname = services().users.displayname(&body.user_id)?
+            displayname = services().users.displayname(&body.user_id)?;
         }
         Some(ProfileField::AvatarUrl) => {
             avatar_url = services().users.avatar_url(&body.user_id)?;
-            blurhash = services().users.blurhash(&body.user_id)?
+            blurhash = services().users.blurhash(&body.user_id)?;
         }
         // TODO: what to do with custom
         Some(_) => {}
@@ -1857,9 +1840,9 @@ pub async fn get_profile_information_route(
     }
 
     Ok(get_profile_information::v1::Response {
-        blurhash,
         displayname,
         avatar_url,
+        blurhash,
     })
 }
 
@@ -1958,7 +1941,7 @@ mod tests {
         assert_eq!(
             add_port_to_hostname("example.com"),
             FedDest::Named(String::from("example.com"), String::from(":8448"))
-        )
+        );
     }
 
     #[test]
@@ -1966,6 +1949,6 @@ mod tests {
         assert_eq!(
             add_port_to_hostname("example.com:1337"),
             FedDest::Named(String::from("example.com"), String::from(":1337"))
-        )
+        );
     }
 }

src/clap.rs

@@ -5,13 +5,13 @@ use clap::Parser;
 /// Returns the current version of the crate with extra info if supplied
 ///
 /// Set the environment variable `CONDUIT_VERSION_EXTRA` to any UTF-8 string to
-/// include it in parenthesis after the SemVer version. A common value are git
+/// include it in parenthesis after the `SemVer` version. A common value are git
 /// commit hashes.
 fn version() -> String {
     let cargo_pkg_version = env!("CARGO_PKG_VERSION");
 
     match option_env!("CONDUIT_VERSION_EXTRA") {
-        Some(x) => format!("{} ({})", cargo_pkg_version, x),
+        Some(x) => format!("{cargo_pkg_version} ({x})"),
         None => cargo_pkg_version.to_owned(),
     }
 }

src/config/mod.rs

@@ -84,6 +84,7 @@ pub struct Config {
     pub emergency_password: Option<String>,
 
     #[serde(flatten)]
+    #[allow(clippy::zero_sized_map_values)]
     pub catchall: BTreeMap<String, IgnoredAny>,
 }
 
@@ -133,7 +134,7 @@ impl Config {
             Some(server_name) => server_name.to_owned(),
             None => {
                 if self.server_name.port().is_some() {
-                    self.server_name.to_owned()
+                    self.server_name.clone()
                 } else {
                     format!("{}:443", self.server_name.host())
                         .try_into()

src/config/proxy.rs

@@ -67,7 +67,7 @@ impl PartialProxyConfig {
         let mut excluded_because = None; // most specific reason it was excluded
         if self.include.is_empty() {
             // treat empty include list as `*`
-            included_because = Some(&WildCardedDomain::WildCard)
+            included_because = Some(&WildCardedDomain::WildCard);
         }
         for wc_domain in &self.include {
             if wc_domain.matches(domain) {
@@ -127,7 +127,7 @@ impl std::str::FromStr for WildCardedDomain {
         Ok(if s.starts_with("*.") {
             WildCardedDomain::WildCarded(s[1..].to_owned())
         } else if s == "*" {
-            WildCardedDomain::WildCarded("".to_owned())
+            WildCardedDomain::WildCarded(String::new())
         } else {
             WildCardedDomain::Exact(s.to_owned())
         })

src/database/abstraction/rocksdb.rs

@@ -32,7 +32,7 @@ fn db_options(max_open_files: i32, rocksdb_cache: &rocksdb::Cache) -> rocksdb::O
     let mut db_opts = rocksdb::Options::default();
     db_opts.set_block_based_table_factory(&block_based_options);
     db_opts.create_if_missing(true);
-    db_opts.increase_parallelism(num_cpus::get() as i32);
+    db_opts.increase_parallelism(num_cpus::get().try_into().unwrap_or(i32::MAX));
     db_opts.set_max_open_files(max_open_files);
     db_opts.set_compression_type(rocksdb::DBCompressionType::Lz4);
     db_opts.set_bottommost_compression_type(rocksdb::DBCompressionType::Zstd);
@@ -41,7 +41,7 @@ fn db_options(max_open_files: i32, rocksdb_cache: &rocksdb::Cache) -> rocksdb::O
     // https://github.com/facebook/rocksdb/wiki/Setup-Options-and-Basic-Tuning
     db_opts.set_level_compaction_dynamic_level_bytes(true);
     db_opts.set_max_background_jobs(6);
-    db_opts.set_bytes_per_sync(1048576);
+    db_opts.set_bytes_per_sync(1_048_576);
 
     // https://github.com/facebook/rocksdb/issues/849
     db_opts.set_keep_log_file_num(100);
@@ -112,6 +112,7 @@ impl KeyValueDatabaseEngine for Arc<Engine> {
     fn memory_usage(&self) -> Result<String> {
         let stats =
             rocksdb::perf::get_memory_usage_stats(Some(&[&self.rocks]), Some(&[&self.cache]))?;
+        #[allow(clippy::cast_precision_loss)]
         Ok(format!(
             "Approximate memory usage of all the mem-tables: {:.3} MB\n\
              Approximate memory usage of un-flushed mem-tables: {:.3} MB\n\
@@ -219,7 +220,7 @@ impl KvTree for RocksDbEngineTree<'_> {
         let lock = self.write_lock.write().unwrap();
 
         let old = self.db.rocks.get_cf_opt(&self.cf(), key, &readoptions)?;
-        let new = utils::increment(old.as_deref()).unwrap();
+        let new = utils::increment(old.as_deref());
         self.db
             .rocks
             .put_cf_opt(&self.cf(), key, &new, &writeoptions)?;
@@ -236,7 +237,7 @@ impl KvTree for RocksDbEngineTree<'_> {
 
         for key in iter {
             let old = self.db.rocks.get_cf_opt(&self.cf(), &key, &readoptions)?;
-            let new = utils::increment(old.as_deref()).unwrap();
+            let new = utils::increment(old.as_deref());
             self.db
                 .rocks
                 .put_cf_opt(&self.cf(), key, new, &writeoptions)?;

src/database/abstraction/sqlite.rs

@@ -88,6 +88,7 @@ impl KeyValueDatabaseEngine for Arc<Engine> {
         // 1. convert MB to KiB
         // 2. divide by permanent connections + permanent iter connections + write connection
         // 3. round down to nearest integer
+        #[allow(clippy::cast_precision_loss)]
         let cache_size_per_thread: u32 = ((config.db_cache_capacity_mb * 1024.0)
             / ((num_cpus::get().max(1) * 2) + 1) as f64)
             as u32;
@@ -217,8 +218,7 @@ impl KvTree for SqliteTable {
         guard.execute("BEGIN", [])?;
         for key in iter {
             let old = self.get_with_guard(&guard, &key)?;
-            let new = crate::utils::increment(old.as_deref())
+            let new = crate::utils::increment(old.as_deref());
-                .expect("utils::increment always returns Some");
             self.insert_with_guard(&guard, &key, &new)?;
         }
         guard.execute("COMMIT", [])?;
@@ -308,8 +308,7 @@ impl KvTree for SqliteTable {
 
         let old = self.get_with_guard(&guard, key)?;
 
-        let new =
+        let new = crate::utils::increment(old.as_deref());
-            crate::utils::increment(old.as_deref()).expect("utils::increment always returns Some");
 
         self.insert_with_guard(&guard, key, &new)?;
 

src/database/key_value/account_data.rs

@@ -20,7 +20,7 @@ impl service::account_data::Data for KeyValueDatabase {
         data: &serde_json::Value,
     ) -> Result<()> {
         let mut prefix = room_id
-            .map(|r| r.to_string())
+            .map(ToString::to_string)
             .unwrap_or_default()
             .as_bytes()
             .to_vec();
@@ -70,7 +70,7 @@ impl service::account_data::Data for KeyValueDatabase {
         kind: RoomAccountDataEventType,
     ) -> Result<Option<Box<serde_json::value::RawValue>>> {
         let mut key = room_id
-            .map(|r| r.to_string())
+            .map(ToString::to_string)
             .unwrap_or_default()
             .as_bytes()
             .to_vec();
@@ -105,7 +105,7 @@ impl service::account_data::Data for KeyValueDatabase {
         let mut userdata = HashMap::new();
 
         let mut prefix = room_id
-            .map(|r| r.to_string())
+            .map(ToString::to_string)
             .unwrap_or_default()
             .as_bytes()
             .to_vec();

src/database/key_value/globals.rs

@@ -136,7 +136,7 @@ impl service::globals::Data for KeyValueDatabase {
     }
 
     fn cleanup(&self) -> Result<()> {
-        self._db.cleanup()
+        self.db.cleanup()
     }
 
     fn memory_usage(&self) -> String {
@@ -160,7 +160,7 @@ our_real_users_cache: {our_real_users_cache}
 appservice_in_room_cache: {appservice_in_room_cache}
 lasttimelinecount_cache: {lasttimelinecount_cache}\n"
         );
-        if let Ok(db_stats) = self._db.memory_usage() {
+        if let Ok(db_stats) = self.db.memory_usage() {
             response += &db_stats;
         }
 
@@ -209,7 +209,7 @@ lasttimelinecount_cache: {lasttimelinecount_cache}\n"
                 self.global.insert(b"keypair", &keypair)?;
                 Ok::<_, Error>(keypair)
             },
-            |s| Ok(s.to_vec()),
+            |s| Ok(s.clone()),
         )?;
 
         let mut parts = keypair_bytes.splitn(2, |&b| b == 0xff);
@@ -285,7 +285,7 @@ lasttimelinecount_cache: {lasttimelinecount_cache}\n"
             .server_signingkeys
             .get(origin.as_bytes())?
             .and_then(|bytes| serde_json::from_slice(&bytes).ok())
-            .map(|keys: ServerSigningKeys| {
+            .map_or_else(BTreeMap::new, |keys: ServerSigningKeys| {
                 let mut tree = keys.verify_keys;
                 tree.extend(
                     keys.old_verify_keys
@@ -293,8 +293,7 @@ lasttimelinecount_cache: {lasttimelinecount_cache}\n"
                         .map(|old| (old.0, VerifyKey::new(old.1.key))),
                 );
                 tree
-            })
+            });
-            .unwrap_or_else(BTreeMap::new);
 
         Ok(signingkeys)
     }

src/database/key_value/pusher.rs

@@ -22,10 +22,7 @@ impl service::pusher::Data for KeyValueDatabase {
                 let mut key = sender.as_bytes().to_vec();
                 key.push(0xff);
                 key.extend_from_slice(ids.pushkey.as_bytes());
-                self.senderkey_pusher
+                self.senderkey_pusher.remove(&key).map_err(Into::into)
-                    .remove(&key)
-                    .map(|_| ())
-                    .map_err(Into::into)
             }
         }
     }

src/database/key_value/rooms/alias.rs

@@ -15,7 +15,7 @@ impl service::rooms::alias::Data for KeyValueDatabase {
 
     fn remove_alias(&self, alias: &RoomAliasId) -> Result<()> {
         if let Some(room_id) = self.alias_roomid.get(alias.alias().as_bytes())? {
-            let mut prefix = room_id.to_vec();
+            let mut prefix = room_id.clone();
             prefix.push(0xff);
 
             for (key, _) in self.aliasid_alias.scan_prefix(prefix) {

src/database/key_value/rooms/search.rs

@@ -54,12 +54,11 @@ impl service::rooms::search::Data for KeyValueDatabase {
                 .map(move |(key, _)| key[prefix3.len()..].to_vec())
         });
 
-        let common_elements = match utils::common_elements(iterators, |a, b| {
+        let Some(common_elements) = utils::common_elements(iterators, |a, b| {
             // We compare b with a because we reversed the iterator earlier
             b.cmp(a)
-        }) {
+        }) else {
-            Some(it) => it,
+            return Ok(None);
-            None => return Ok(None),
         };
 
         Ok(Some((Box::new(common_elements), words)))

src/database/key_value/rooms/short.rs

@@ -10,17 +10,17 @@ impl service::rooms::short::Data for KeyValueDatabase {
             return Ok(*short);
         }
 
-        let short = match self.eventid_shorteventid.get(event_id.as_bytes())? {
+        let short =
-            Some(shorteventid) => utils::u64_from_bytes(&shorteventid)
+            if let Some(shorteventid) = self.eventid_shorteventid.get(event_id.as_bytes())? {
-                .map_err(|_| Error::bad_database("Invalid shorteventid in db."))?,
+                utils::u64_from_bytes(&shorteventid)
-            None => {
+                    .map_err(|_| Error::bad_database("Invalid shorteventid in db."))?
+            } else {
                 let shorteventid = services().globals.next_count()?;
                 self.eventid_shorteventid
                     .insert(event_id.as_bytes(), &shorteventid.to_be_bytes())?;
                 self.shorteventid_eventid
                     .insert(&shorteventid.to_be_bytes(), event_id.as_bytes())?;
                 shorteventid
-            }
             };
 
         self.eventidshort_cache
@@ -45,13 +45,13 @@ impl service::rooms::short::Data for KeyValueDatabase {
             return Ok(Some(*short));
         }
 
-        let mut statekey = event_type.to_string().as_bytes().to_vec();
+        let mut state_key_bytes = event_type.to_string().as_bytes().to_vec();
-        statekey.push(0xff);
+        state_key_bytes.push(0xff);
-        statekey.extend_from_slice(state_key.as_bytes());
+        state_key_bytes.extend_from_slice(state_key.as_bytes());
 
         let short = self
             .statekey_shortstatekey
-            .get(&statekey)?
+            .get(&state_key_bytes)?
             .map(|shortstatekey| {
                 utils::u64_from_bytes(&shortstatekey)
                     .map_err(|_| Error::bad_database("Invalid shortstatekey in db."))
@@ -82,21 +82,21 @@ impl service::rooms::short::Data for KeyValueDatabase {
             return Ok(*short);
         }
 
-        let mut statekey = event_type.to_string().as_bytes().to_vec();
+        let mut state_key_bytes = event_type.to_string().as_bytes().to_vec();
-        statekey.push(0xff);
+        state_key_bytes.push(0xff);
-        statekey.extend_from_slice(state_key.as_bytes());
+        state_key_bytes.extend_from_slice(state_key.as_bytes());
 
-        let short = match self.statekey_shortstatekey.get(&statekey)? {
+        let short =
-            Some(shortstatekey) => utils::u64_from_bytes(&shortstatekey)
+            if let Some(shortstatekey) = self.statekey_shortstatekey.get(&state_key_bytes)? {
-                .map_err(|_| Error::bad_database("Invalid shortstatekey in db."))?,
+                utils::u64_from_bytes(&shortstatekey)
-            None => {
+                    .map_err(|_| Error::bad_database("Invalid shortstatekey in db."))?
+            } else {
                 let shortstatekey = services().globals.next_count()?;
                 self.statekey_shortstatekey
-                    .insert(&statekey, &shortstatekey.to_be_bytes())?;
+                    .insert(&state_key_bytes, &shortstatekey.to_be_bytes())?;
                 self.shortstatekey_statekey
-                    .insert(&shortstatekey.to_be_bytes(), &statekey)?;
+                    .insert(&shortstatekey.to_be_bytes(), &state_key_bytes)?;
                 shortstatekey
-            }
             };
 
         self.statekeyshort_cache
@@ -175,21 +175,22 @@ impl service::rooms::short::Data for KeyValueDatabase {
         Ok(result)
     }
 
-    /// Returns (shortstatehash, already_existed)
+    /// Returns (shortstatehash, `already_existed`)
     fn get_or_create_shortstatehash(&self, state_hash: &[u8]) -> Result<(u64, bool)> {
-        Ok(match self.statehash_shortstatehash.get(state_hash)? {
+        Ok(
-            Some(shortstatehash) => (
+            if let Some(shortstatehash) = self.statehash_shortstatehash.get(state_hash)? {
+                (
                     utils::u64_from_bytes(&shortstatehash)
                         .map_err(|_| Error::bad_database("Invalid shortstatehash in db."))?,
                     true,
-            ),
+                )
-            None => {
+            } else {
                 let shortstatehash = services().globals.next_count()?;
                 self.statehash_shortstatehash
                     .insert(state_hash, &shortstatehash.to_be_bytes())?;
                 (shortstatehash, false)
-            }
+            },
-        })
+        )
     }
 
     fn get_shortroomid(&self, room_id: &RoomId) -> Result<Option<u64>> {
@@ -203,15 +204,16 @@ impl service::rooms::short::Data for KeyValueDatabase {
     }
 
     fn get_or_create_shortroomid(&self, room_id: &RoomId) -> Result<u64> {
-        Ok(match self.roomid_shortroomid.get(room_id.as_bytes())? {
+        Ok(
-            Some(short) => utils::u64_from_bytes(&short)
+            if let Some(short) = self.roomid_shortroomid.get(room_id.as_bytes())? {
-                .map_err(|_| Error::bad_database("Invalid shortroomid in db."))?,
+                utils::u64_from_bytes(&short)
-            None => {
+                    .map_err(|_| Error::bad_database("Invalid shortroomid in db."))?
+            } else {
                 let short = services().globals.next_count()?;
                 self.roomid_shortroomid
                     .insert(room_id.as_bytes(), &short.to_be_bytes())?;
                 short
-            }
+            },
-        })
+        )
     }
 }

src/database/key_value/rooms/state.rs

@@ -63,7 +63,7 @@ impl service::rooms::state::Data for KeyValueDatabase {
         }
 
         for event_id in event_ids {
-            let mut key = prefix.to_owned();
+            let mut key = prefix.clone();
             key.extend_from_slice(event_id.as_bytes());
             self.roomid_pduleaves.insert(&key, event_id.as_bytes())?;
         }

src/database/key_value/rooms/state_accessor.rs

@@ -79,13 +79,12 @@ impl service::rooms::state_accessor::Data for KeyValueDatabase {
         event_type: &StateEventType,
         state_key: &str,
     ) -> Result<Option<Arc<EventId>>> {
-        let shortstatekey = match services()
+        let Some(shortstatekey) = services()
             .rooms
             .short
             .get_shortstatekey(event_type, state_key)?
-        {
+        else {
-            Some(s) => s,
+            return Ok(None);
-            None => return Ok(None),
         };
         let full_state = services()
             .rooms

src/database/key_value/rooms/user.rs

@@ -31,11 +31,10 @@ impl service::rooms::user::Data for KeyValueDatabase {
 
         self.userroomid_notificationcount
             .get(&userroom_id)?
-            .map(|bytes| {
+            .map_or(Ok(0), |bytes| {
                 utils::u64_from_bytes(&bytes)
                     .map_err(|_| Error::bad_database("Invalid notification count in db."))
             })
-            .unwrap_or(Ok(0))
     }
 
     fn highlight_count(&self, user_id: &UserId, room_id: &RoomId) -> Result<u64> {
@@ -45,11 +44,10 @@ impl service::rooms::user::Data for KeyValueDatabase {
 
         self.userroomid_highlightcount
             .get(&userroom_id)?
-            .map(|bytes| {
+            .map_or(Ok(0), |bytes| {
                 utils::u64_from_bytes(&bytes)
                     .map_err(|_| Error::bad_database("Invalid highlight count in db."))
             })
-            .unwrap_or(Ok(0))
     }
 
     fn last_notification_read(&self, user_id: &UserId, room_id: &RoomId) -> Result<u64> {

src/database/key_value/sending.rs

@@ -67,9 +67,9 @@ impl service::sending::Data for KeyValueDatabase {
         for (outgoing_kind, event) in requests {
             let mut key = outgoing_kind.get_prefix();
             if let SendingEventType::Pdu(value) = &event {
-                key.extend_from_slice(value)
+                key.extend_from_slice(value);
             } else {
-                key.extend_from_slice(&services().globals.next_count()?.to_be_bytes())
+                key.extend_from_slice(&services().globals.next_count()?.to_be_bytes());
             }
             let value = if let SendingEventType::Edu(value) = &event {
                 &**value

src/database/key_value/transaction_ids.rs

@@ -12,7 +12,7 @@ impl service::transaction_ids::Data for KeyValueDatabase {
     ) -> Result<()> {
         let mut key = user_id.as_bytes().to_vec();
         key.push(0xff);
-        key.extend_from_slice(device_id.map(|d| d.as_bytes()).unwrap_or_default());
+        key.extend_from_slice(device_id.map(DeviceId::as_bytes).unwrap_or_default());
         key.push(0xff);
         key.extend_from_slice(txn_id.as_bytes());
 
@@ -29,7 +29,7 @@ impl service::transaction_ids::Data for KeyValueDatabase {
     ) -> Result<Option<Vec<u8>>> {
         let mut key = user_id.as_bytes().to_vec();
         key.push(0xff);
-        key.extend_from_slice(device_id.map(|d| d.as_bytes()).unwrap_or_default());
+        key.extend_from_slice(device_id.map(DeviceId::as_bytes).unwrap_or_default());
         key.push(0xff);
         key.extend_from_slice(txn_id.as_bytes());
 

src/database/key_value/uiaa.rs

@@ -34,7 +34,7 @@ impl service::uiaa::Data for KeyValueDatabase {
             .read()
             .unwrap()
             .get(&(user_id.to_owned(), device_id.to_owned(), session.to_owned()))
-            .map(|j| j.to_owned())
+            .map(ToOwned::to_owned)
     }
 
     fn update_uiaa_session(

src/database/key_value/users.rs

@@ -141,7 +141,7 @@ impl service::users::Data for KeyValueDatabase {
         Ok(())
     }
 
-    /// Get the avatar_url of a user.
+    /// Get the `avatar_url` of a user.
     fn avatar_url(&self, user_id: &UserId) -> Result<Option<OwnedMxcUri>> {
         self.userid_avatarurl
             .get(user_id.as_bytes())?
@@ -153,7 +153,7 @@ impl service::users::Data for KeyValueDatabase {
             .transpose()
     }
 
-    /// Sets a new avatar_url or removes it if avatar_url is None.
+    /// Sets a new `avatar_url` or removes it if `avatar_url` is None.
     fn set_avatar_url(&self, user_id: &UserId, avatar_url: Option<OwnedMxcUri>) -> Result<()> {
         if let Some(avatar_url) = avatar_url {
             self.userid_avatarurl
@@ -178,7 +178,7 @@ impl service::users::Data for KeyValueDatabase {
             .transpose()
     }
 
-    /// Sets a new avatar_url or removes it if avatar_url is None.
+    /// Sets a new `avatar_url` or removes it if `avatar_url` is None.
     fn set_blurhash(&self, user_id: &UserId, blurhash: Option<String>) -> Result<()> {
         if let Some(blurhash) = blurhash {
             self.userid_blurhash
@@ -343,12 +343,11 @@ impl service::users::Data for KeyValueDatabase {
     fn last_one_time_keys_update(&self, user_id: &UserId) -> Result<u64> {
         self.userid_lastonetimekeyupdate
             .get(user_id.as_bytes())?
-            .map(|bytes| {
+            .map_or(Ok(0), |bytes| {
                 utils::u64_from_bytes(&bytes).map_err(|_| {
                     Error::bad_database("Count in roomid_lastroomactiveupdate is invalid.")
                 })
             })
-            .unwrap_or(Ok(0))
     }
 
     fn take_one_time_key(
@@ -949,7 +948,7 @@ impl KeyValueDatabase {}
 
 /// Will only return with Some(username) if the password was not empty and the
 /// username could be successfully parsed.
-/// If utils::string_from_bytes(...) returns an error that username will be skipped
+/// If `utils::string_from_bytes`(...) returns an error that username will be skipped
 /// and the error will be logged.
 fn get_username_with_valid_password(username: &[u8], password: &[u8]) -> Option<String> {
     // A valid password is not empty

src/database/mod.rs

@@ -34,7 +34,7 @@ use tokio::time::interval;
 use tracing::{debug, error, info, warn};
 
 pub struct KeyValueDatabase {
-    _db: Arc<dyn KeyValueDatabaseEngine>,
+    db: Arc<dyn KeyValueDatabaseEngine>,
 
     //pub globals: globals::Globals,
     pub(super) global: Arc<dyn KvTree>,
@@ -113,7 +113,7 @@ pub struct KeyValueDatabase {
     pub(super) roomsynctoken_shortstatehash: Arc<dyn KvTree>,
     /// Remember the state hash at events in the past.
     pub(super) shorteventid_shortstatehash: Arc<dyn KvTree>,
-    /// StateKey = EventType + StateKey, ShortStateKey = Count
+    /// `StateKey` = `EventType` + `StateKey`, `ShortStateKey` = Count
     pub(super) statekey_shortstatekey: Arc<dyn KvTree>,
     pub(super) shortstatekey_statekey: Arc<dyn KvTree>,
 
@@ -127,14 +127,14 @@ pub struct KeyValueDatabase {
 
     pub(super) shorteventid_authchain: Arc<dyn KvTree>,
 
-    /// RoomId + EventId -> outlier PDU.
+    /// `RoomId` + `EventId` -> outlier PDU.
     /// Any pdu that has passed the steps 1-8 in the incoming event /federation/send/txn.
     pub(super) eventid_outlierpdu: Arc<dyn KvTree>,
     pub(super) softfailedeventids: Arc<dyn KvTree>,
 
-    /// ShortEventId + ShortEventId -> ().
+    /// `ShortEventId` + `ShortEventId` -> ().
     pub(super) tofrom_relation: Arc<dyn KvTree>,
-    /// RoomId + EventId -> Parent PDU EventId.
+    /// `RoomId` + `EventId` -> Parent PDU `EventId`.
     pub(super) referencedevents: Arc<dyn KvTree>,
 
     //pub account_data: account_data::AccountData,
@@ -241,6 +241,8 @@ impl KeyValueDatabase {
                 .map_err(|_| Error::BadConfig("Database folder doesn't exists and couldn't be created (e.g. due to missing permissions). Please create the database folder yourself."))?;
         }
 
+        // Databases which are disabled will trigger this
+        #[allow(clippy::match_same_arms)]
         let builder: Arc<dyn KeyValueDatabaseEngine> = match &*config.database_backend {
             "sqlite" => {
                 #[cfg(not(feature = "sqlite"))]
@@ -274,7 +276,7 @@ impl KeyValueDatabase {
         }
 
         let db_raw = Box::new(Self {
-            _db: builder.clone(),
+            db: builder.clone(),
             userid_password: builder.open_tree("userid_password")?,
             userid_displayname: builder.open_tree("userid_displayname")?,
             userid_avatarurl: builder.open_tree("userid_avatarurl")?,
@@ -428,12 +430,9 @@ impl KeyValueDatabase {
                 for (roomserverid, _) in db.roomserverids.iter() {
                     let mut parts = roomserverid.split(|&b| b == 0xff);
                     let room_id = parts.next().expect("split always returns one element");
-                    let servername = match parts.next() {
+                    let Some(servername) = parts.next() else {
-                        Some(s) => s,
-                        None => {
                         error!("Migration: Invalid roomserverid in db.");
                         continue;
-                        }
                     };
                     let mut serverroomid = servername.to_vec();
                     serverroomid.push(0xff);
@@ -620,7 +619,7 @@ impl KeyValueDatabase {
                         Ok::<_, Error>(())
                     };
 
-                for (k, seventid) in db._db.open_tree("stateid_shorteventid")?.iter() {
+                for (k, seventid) in db.db.open_tree("stateid_shorteventid")?.iter() {
                     let sstatehash = utils::u64_from_bytes(&k[0..size_of::<u64>()])
                         .expect("number of bytes is correct");
                     let sstatekey = k[size_of::<u64>()..].to_vec();
@@ -793,7 +792,7 @@ impl KeyValueDatabase {
                 }
 
                 // Force E2EE device list updates so we can send them over federation
-                for user_id in services().users.iter().filter_map(|r| r.ok()) {
+                for user_id in services().users.iter().filter_map(std::result::Result::ok) {
                     services().users.mark_device_key_update(&user_id)?;
                 }
 
@@ -803,7 +802,7 @@ impl KeyValueDatabase {
             }
 
             if services().globals.database_version()? < 11 {
-                db._db
+                db.db
                     .open_tree("userdevicesessionid_uiaarequest")?
                     .clear()?;
                 services().globals.bump_database_version(11)?;
@@ -979,7 +978,7 @@ impl KeyValueDatabase {
                 error!(
                     "Could not set the configured emergency password for the conduit user: {}",
                     e
-                )
+                );
             }
         };
 
@@ -997,7 +996,7 @@ impl KeyValueDatabase {
     pub fn flush(&self) -> Result<()> {
         let start = std::time::Instant::now();
 
-        let res = self._db.flush();
+        let res = self.db.flush();
 
         debug!("flush: took {:?}", start.elapsed());
 
@@ -1017,17 +1016,10 @@ impl KeyValueDatabase {
     }
 
     async fn try_handle_updates() -> Result<()> {
-        let response = services()
-            .globals
-            .default_client()
-            .get("https://conduit.rs/check-for-updates/stable")
-            .send()
-            .await?;
-
         #[derive(Deserialize)]
         struct CheckForUpdatesResponseEntry {
-            id: u64,
             date: String,
+            id: u64,
             message: String,
         }
         #[derive(Deserialize)]
@@ -1035,6 +1027,13 @@ impl KeyValueDatabase {
             updates: Vec<CheckForUpdatesResponseEntry>,
         }
 
+        let response = services()
+            .globals
+            .default_client()
+            .get("https://conduit.rs/check-for-updates/stable")
+            .send()
+            .await?;
+
         let response = serde_json::from_str::<CheckForUpdatesResponse>(&response.text().await?)
             .map_err(|_| Error::BadServerResponse("Bad version check response"))?;
 
@@ -1048,7 +1047,7 @@ impl KeyValueDatabase {
                     .send_message(RoomMessageEventContent::text_plain(format!(
                     "@room: The following is a message from the Conduit developers. It was sent on '{}':\n\n{}",
                     update.date, update.message
-                )))
+                )));
             }
         }
         services()
@@ -1066,7 +1065,7 @@ impl KeyValueDatabase {
         use std::time::{Duration, Instant};
 
         let timer_interval =
-            Duration::from_secs(services().globals.config.cleanup_second_interval as u64);
+            Duration::from_secs(u64::from(services().globals.config.cleanup_second_interval));
 
         tokio::spawn(async move {
             let mut i = interval(timer_interval);

src/lib.rs

@@ -1,7 +1,15 @@
+// All API endpoints must be async
+#[allow(clippy::unused_async)]
+// We expect request users and servers (probably shouldn't tho)
+#[allow(clippy::missing_panics_doc)]
 pub mod api;
 pub mod clap;
 mod config;
+// Results in large capacity if set to a negative number, user's fault really :P
+#[allow(clippy::cast_sign_loss)]
 mod database;
+// `self` is required for easy access to methods
+#[allow(clippy::unused_self)]
 mod service;
 mod utils;
 

src/main.rs

@@ -201,7 +201,7 @@ async fn run_server() -> io::Result<()> {
             #[cfg(feature = "systemd")]
             let _ = sd_notify::notify(true, &[sd_notify::NotifyState::Ready]);
 
-            server.await?
+            server.await?;
         }
         None => {
             let server = bind(addr).handle(handle).serve(app);
@@ -209,7 +209,7 @@ async fn run_server() -> io::Result<()> {
             #[cfg(feature = "systemd")]
             let _ = sd_notify::notify(true, &[sd_notify::NotifyState::Ready]);
 
-            server.await?
+            server.await?;
         }
     }
 
@@ -461,8 +461,8 @@ async fn shutdown_signal(handle: ServerHandle) {
     let sig: &str;
 
     tokio::select! {
-        _ = ctrl_c => { sig = "Ctrl+C"; },
+        () = ctrl_c => { sig = "Ctrl+C"; },
-        _ = terminate => { sig = "SIGTERM"; },
+        () = terminate => { sig = "SIGTERM"; },
     }
 
     warn!("Received {}, shutting down...", sig);

src/service/admin/mod.rs

@@ -110,7 +110,7 @@ enum AdminCommand {
         force: bool,
     },
 
-    /// Get the auth_chain of a PDU
+    /// Get the `auth_chain` of a PDU
     GetAuthChain {
         /// An event ID (the $ character followed by the base64 reference hash)
         event_id: Box<EventId>,
@@ -229,7 +229,7 @@ impl Service {
                                 .roomid_mutex_state
                                 .write()
                                 .await
-                                .entry(conduit_room.to_owned())
+                                .entry(conduit_room.clone())
                                 .or_default(),
                         );
 
@@ -711,11 +711,11 @@ impl Service {
                         match <&UserId>::try_from(user) {
                             Ok(user_id) => {
                                 if user_id.server_name() != services().globals.server_name() {
-                                    remote_ids.push(user_id)
+                                    remote_ids.push(user_id);
                                 } else if !services().users.exists(user_id)? {
-                                    non_existant_ids.push(user_id)
+                                    non_existant_ids.push(user_id);
                                 } else {
-                                    user_ids.push(user_id)
+                                    user_ids.push(user_id);
                                 }
                             }
                             Err(_) => {
@@ -770,20 +770,21 @@ impl Service {
 
                     if !force {
                         user_ids.retain(|&user_id| match services().users.is_admin(user_id) {
-                            Ok(is_admin) => match is_admin {
+                            Ok(is_admin) => {
-                                true => {
+                                if is_admin {
                                     admins.push(user_id.localpart());
                                     false
+                                } else {
+                                    true
+                                }
                             }
-                                false => true,
-                            },
                             Err(_) => false,
-                        })
+                        });
                     }
 
                     for &user_id in &user_ids {
                         if services().users.deactivate_account(user_id).is_ok() {
-                            deactivation_count += 1
+                            deactivation_count += 1;
                         }
                     }
 
@@ -846,7 +847,7 @@ impl Service {
 
                             let pub_key_map = pub_key_map.read().await;
                             match ruma::signatures::verify_json(&pub_key_map, &value) {
-                                Ok(_) => RoomMessageEventContent::text_plain("Signature correct"),
+                                Ok(()) => RoomMessageEventContent::text_plain("Signature correct"),
                                 Err(e) => RoomMessageEventContent::text_plain(format!(
                                     "Signature verification failed: {e}"
                                 )),
@@ -909,8 +910,7 @@ impl Service {
 
             while text_lines
                 .get(line_index)
-                .map(|line| line.starts_with('#'))
+                .is_some_and(|line| line.starts_with('#'))
-                .unwrap_or(false)
             {
                 command_body += if text_lines[line_index].starts_with("# ") {
                     &text_lines[line_index][2..]
@@ -1001,7 +1001,7 @@ impl Service {
                     event_type: TimelineEventType::RoomCreate,
                     content: to_raw_value(&content).expect("event is valid, we just created it"),
                     unsigned: None,
-                    state_key: Some("".to_owned()),
+                    state_key: Some(String::new()),
                     redacts: None,
                 },
                 &conduit_user,
@@ -1054,7 +1054,7 @@ impl Service {
                     })
                     .expect("event is valid, we just created it"),
                     unsigned: None,
-                    state_key: Some("".to_owned()),
+                    state_key: Some(String::new()),
                     redacts: None,
                 },
                 &conduit_user,
@@ -1073,7 +1073,7 @@ impl Service {
                     content: to_raw_value(&RoomJoinRulesEventContent::new(JoinRule::Invite))
                         .expect("event is valid, we just created it"),
                     unsigned: None,
-                    state_key: Some("".to_owned()),
+                    state_key: Some(String::new()),
                     redacts: None,
                 },
                 &conduit_user,
@@ -1094,7 +1094,7 @@ impl Service {
                     ))
                     .expect("event is valid, we just created it"),
                     unsigned: None,
-                    state_key: Some("".to_owned()),
+                    state_key: Some(String::new()),
                     redacts: None,
                 },
                 &conduit_user,
@@ -1115,7 +1115,7 @@ impl Service {
                     ))
                     .expect("event is valid, we just created it"),
                     unsigned: None,
-                    state_key: Some("".to_owned()),
+                    state_key: Some(String::new()),
                     redacts: None,
                 },
                 &conduit_user,
@@ -1135,7 +1135,7 @@ impl Service {
                     content: to_raw_value(&RoomNameEventContent::new(room_name))
                         .expect("event is valid, we just created it"),
                     unsigned: None,
-                    state_key: Some("".to_owned()),
+                    state_key: Some(String::new()),
                     redacts: None,
                 },
                 &conduit_user,
@@ -1155,7 +1155,7 @@ impl Service {
                     })
                     .expect("event is valid, we just created it"),
                     unsigned: None,
-                    state_key: Some("".to_owned()),
+                    state_key: Some(String::new()),
                     redacts: None,
                 },
                 &conduit_user,
@@ -1181,7 +1181,7 @@ impl Service {
                     })
                     .expect("event is valid, we just created it"),
                     unsigned: None,
-                    state_key: Some("".to_owned()),
+                    state_key: Some(String::new()),
                     redacts: None,
                 },
                 &conduit_user,
@@ -1291,7 +1291,7 @@ impl Service {
 
             // Set power level
             let mut users = BTreeMap::new();
-            users.insert(conduit_user.to_owned(), 100.into());
+            users.insert(conduit_user.clone(), 100.into());
             users.insert(user_id.to_owned(), 100.into());
 
             services()
@@ -1306,7 +1306,7 @@ impl Service {
                         })
                         .expect("event is valid, we just created it"),
                         unsigned: None,
-                        state_key: Some("".to_owned()),
+                        state_key: Some(String::new()),
                         redacts: None,
                     },
                     &conduit_user,

src/service/media/data.rs

@@ -10,7 +10,7 @@ pub trait Data: Send + Sync {
         content_type: Option<&str>,
     ) -> Result<Vec<u8>>;
 
-    /// Returns content_disposition, content_type and the metadata key.
+    /// Returns `content_disposition`, `content_type` and the metadata key.
     fn search_file_metadata(
         &self,
         mxc: String,

src/service/media/mod.rs

@@ -128,7 +128,7 @@ impl Service {
             Ok(Some(FileMeta {
                 content_disposition,
                 content_type,
-                file: file.to_vec(),
+                file: file.clone(),
             }))
         } else if let Ok((content_disposition, content_type, key)) =
             self.db.search_file_metadata(mxc.clone(), 0, 0)
@@ -145,7 +145,7 @@ impl Service {
                     return Ok(Some(FileMeta {
                         content_disposition,
                         content_type,
-                        file: file.to_vec(),
+                        file: file.clone(),
                     }));
                 }
 
@@ -211,14 +211,14 @@ impl Service {
                 Ok(Some(FileMeta {
                     content_disposition,
                     content_type,
-                    file: thumbnail_bytes.to_vec(),
+                    file: thumbnail_bytes.clone(),
                 }))
             } else {
                 // Couldn't parse file to generate thumbnail, send original
                 Ok(Some(FileMeta {
                     content_disposition,
                     content_type,
-                    file: file.to_vec(),
+                    file: file.clone(),
                 }))
             }
         } else {

src/service/mod.rs

@@ -39,6 +39,8 @@ pub struct Services {
 }
 
 impl Services {
+    // Results in large capacity if set to a negative number, user's fault really :P
+    #[allow(clippy::cast_sign_loss)]
     pub fn build<
         D: appservice::Data
             + pusher::Data

src/service/pusher/mod.rs

@@ -64,7 +64,7 @@ impl Service {
                 warn!("Failed to find destination {}: {}", destination, e);
                 Error::BadServerResponse("Invalid destination")
             })?
-            .map(|body| body.freeze());
+            .map(BytesMut::freeze);
 
         let reqwest_request = reqwest::Request::try_from(http_request)?;
 
@@ -252,7 +252,7 @@ impl Service {
                         .iter()
                         .any(|t| matches!(t, Tweak::Highlight(true) | Tweak::Sound(_)))
                 {
-                    notifi.prio = NotificationPriority::High
+                    notifi.prio = NotificationPriority::High;
                 }
 
                 if event_id_only {
@@ -279,7 +279,6 @@ impl Service {
                 Ok(())
             }
             // TODO: Handle email
-            PusherKind::Email(_) => Ok(()),
             _ => Ok(()),
         }
     }

src/service/rooms/edus/presence/data.rs

@@ -6,7 +6,7 @@ use ruma::{events::presence::PresenceEvent, OwnedUserId, RoomId, UserId};
 pub trait Data: Send + Sync {
     /// Adds a presence event which will be saved until a new event replaces it.
     ///
-    /// Note: This method takes a RoomId because presence updates are always bound to rooms to
+    /// Note: This method takes a `RoomId` because presence updates are always bound to rooms to
     /// make sure users outside these rooms can't see them.
     fn update_presence(
         &self,
@@ -21,7 +21,7 @@ pub trait Data: Send + Sync {
     /// Returns the timestamp of the last presence update of this user in millis since the unix epoch.
     fn last_presence_update(&self, user_id: &UserId) -> Result<Option<u64>>;
 
-    /// Returns the presence event with correct last_active_ago.
+    /// Returns the presence event with correct `last_active_ago`.
     fn get_presence_event(
         &self,
         room_id: &RoomId,

src/service/rooms/edus/presence/mod.rs

@@ -10,10 +10,13 @@ pub struct Service {
     pub db: &'static dyn Data,
 }
 
+// TODO: remove when presence is implemented
+#[allow(clippy::unnecessary_wraps)]
+#[allow(clippy::needless_pass_by_value)]
 impl Service {
     /// Adds a presence event which will be saved until a new event replaces it.
     ///
-    /// Note: This method takes a RoomId because presence updates are always bound to rooms to
+    /// Note: This method takes a `RoomId` because presence updates are always bound to rooms to
     /// make sure users outside these rooms can't see them.
     pub fn update_presence(
         &self,

src/service/rooms/edus/read_receipt/data.rs

@@ -10,7 +10,7 @@ pub trait Data: Send + Sync {
         event: ReceiptEvent,
     ) -> Result<()>;
 
-    /// Returns an iterator over the most recent read_receipts in a room that happened after the event with id `since`.
+    /// Returns an iterator over the most recent `read_receipts` in a room that happened after the event with id `since`.
     #[allow(clippy::type_complexity)]
     fn readreceipts_since<'a>(
         &'a self,

src/service/rooms/edus/typing/mod.rs

@@ -11,7 +11,7 @@ pub struct Service {
 }
 
 impl Service {
-    /// Sets a user as typing until the timeout timestamp is reached or roomtyping_remove is
+    /// Sets a user as typing until the timeout timestamp is reached or `roomtyping_remove` is
     /// called.
     pub async fn typing_add(&self, user_id: &UserId, room_id: &RoomId, timeout: u64) -> Result<()> {
         self.typing

src/service/rooms/event_handler/mod.rs

@@ -39,7 +39,7 @@ use serde_json::value::RawValue as RawJsonValue;
 use tokio::sync::{RwLock, RwLockWriteGuard, Semaphore};
 use tracing::{debug, error, info, trace, warn};
 
-use crate::{service::*, services, Error, PduEvent, Result};
+use crate::{service::pdu, services, Error, PduEvent, Result};
 
 use super::state_compressor::CompressedStateEvent;
 
@@ -99,7 +99,7 @@ impl Service {
 
         // 1. Skip the PDU if we already have it as a timeline event
         if let Some(pdu_id) = services().rooms.timeline.get_pdu_id(event_id)? {
-            return Ok(Some(pdu_id.to_vec()));
+            return Ok(Some(pdu_id.clone()));
         }
 
         let create_event = services()
@@ -199,7 +199,7 @@ impl Service {
                         e.insert((Instant::now(), 1));
                     }
                     hash_map::Entry::Occupied(mut e) => {
-                        *e.get_mut() = (Instant::now(), e.get().1 + 1)
+                        *e.get_mut() = (Instant::now(), e.get().1 + 1);
                     }
                 }
                 continue;
@@ -243,7 +243,7 @@ impl Service {
                             e.insert((Instant::now(), 1));
                         }
                         hash_map::Entry::Occupied(mut e) => {
-                            *e.get_mut() = (Instant::now(), e.get().1 + 1)
+                            *e.get_mut() = (Instant::now(), e.get().1 + 1);
                         }
                     }
                 }
@@ -342,14 +342,11 @@ impl Service {
                 Ok(ruma::signatures::Verified::Signatures) => {
                     // Redact
                     warn!("Calculated hash does not match: {}", event_id);
-                    let obj = match ruma::canonical_json::redact(value, room_version_id, None) {
+                    let Ok(obj) = ruma::canonical_json::redact(value, room_version_id, None) else {
-                        Ok(obj) => obj,
-                        Err(_) => {
                         return Err(Error::BadRequest(
                             ErrorKind::InvalidParam,
                             "Redaction failed",
-                            ))
+                        ));
-                        }
                     };
 
                     // Skip the PDU if it is redacted and we already have it as an outlier event
@@ -409,12 +406,9 @@ impl Service {
             // Build map of auth events
             let mut auth_events = HashMap::new();
             for id in &incoming_pdu.auth_events {
-                let auth_event = match services().rooms.timeline.get_pdu(id)? {
+                let Some(auth_event) = services().rooms.timeline.get_pdu(id)? else {
-                    Some(e) => e,
-                    None => {
                     warn!("Could not find auth event {}", id);
                     continue;
-                    }
                 };
 
                 self.check_room_id(room_id, &auth_event)?;
@@ -441,8 +435,8 @@ impl Service {
             // The original create event must be in the auth events
             if !matches!(
                 auth_events
-                    .get(&(StateEventType::RoomCreate, "".to_owned()))
+                    .get(&(StateEventType::RoomCreate, String::new()))
-                    .map(|a| a.as_ref()),
+                    .map(AsRef::as_ref),
                 Some(_) | None
             ) {
                 return Err(Error::BadRequest(
@@ -574,21 +568,16 @@ impl Service {
 
             let mut okay = true;
             for prev_eventid in &incoming_pdu.prev_events {
-                let prev_event =
+                let Ok(Some(prev_event)) = services().rooms.timeline.get_pdu(prev_eventid) else {
-                    if let Ok(Some(pdu)) = services().rooms.timeline.get_pdu(prev_eventid) {
-                        pdu
-                    } else {
                     okay = false;
                     break;
                 };
 
-                let sstatehash = if let Ok(Some(s)) = services()
+                let Ok(Some(sstatehash)) = services()
                     .rooms
                     .state_accessor
                     .pdu_shortstatehash(prev_eventid)
-                {
+                else {
-                    s
-                } else {
                     okay = false;
                     break;
                 };
@@ -738,7 +727,7 @@ impl Service {
                         .get_shortstatekey(&StateEventType::RoomCreate, "")?
                         .expect("Room exists");
 
-                    if state.get(&create_shortstatekey).map(|id| id.as_ref())
+                    if state.get(&create_shortstatekey).map(AsRef::as_ref)
                         != Some(&create_event.event_id)
                     {
                         return Err(Error::bad_database(
@@ -1046,16 +1035,12 @@ impl Service {
         };
 
         let lock = services().globals.stateres_mutex.lock();
-        let state = match state_res::resolve(
+        let Ok(state) =
-            room_version_id,
+            state_res::resolve(room_version_id, &fork_states, auth_chain_sets, fetch_event)
-            &fork_states,
+        else {
-            auth_chain_sets,
+            return Err(Error::bad_database(
-            fetch_event,
+                "State resolution failed, either an event could not be found or deserialization",
-        ) {
+            ));
-            Ok(new_state) => new_state,
-            Err(_) => {
-                return Err(Error::bad_database("State resolution failed, either an event could not be found or deserialization"));
-            }
         };
 
         drop(lock);
@@ -1113,7 +1098,7 @@ impl Service {
                         e.insert((Instant::now(), 1));
                     }
                     hash_map::Entry::Occupied(mut e) => {
-                        *e.get_mut() = (Instant::now(), e.get().1 + 1)
+                        *e.get_mut() = (Instant::now(), e.get().1 + 1);
                     }
                 }
             };
@@ -1172,7 +1157,7 @@ impl Service {
                     }
 
                     info!("Fetching {} over federation.", next_id);
-                    match services()
+                    if let Ok(res) = services()
                         .sending
                         .send_federation_request(
                             origin,
@@ -1182,15 +1167,12 @@ impl Service {
                         )
                         .await
                     {
-                        Ok(res) => {
                         info!("Got {} over federation", next_id);
-                            let (calculated_event_id, value) =
+                        let Ok((calculated_event_id, value)) =
-                                match pdu::gen_event_id_canonical_json(&res.pdu, room_version_id) {
+                            pdu::gen_event_id_canonical_json(&res.pdu, room_version_id)
-                                    Ok(t) => t,
+                        else {
-                                    Err(_) => {
                             back_off((*next_id).to_owned()).await;
                             continue;
-                                    }
                         };
 
                         if calculated_event_id != *next_id {
@@ -1217,13 +1199,11 @@ impl Service {
 
                         events_in_reverse_order.push((next_id.clone(), value));
                         events_all.insert(next_id);
-                        }
+                    } else {
-                        Err(_) => {
                         warn!("Failed to fetch event: {}", next_id);
                         back_off((*next_id).to_owned()).await;
                     }
                 }
-                }
 
                 for (next_id, value) in events_in_reverse_order.iter().rev() {
                     if let Some((time, tries)) = services()
@@ -1410,12 +1390,9 @@ impl Service {
                 )
                 .await;
 
-            let keys = match fetch_res {
+            let Ok(keys) = fetch_res else {
-                Ok(keys) => keys,
-                Err(_) => {
                 warn!("Signature verification failed: Could not fetch signing key.",);
                 continue;
-                }
             };
 
             pub_key_map
@@ -1637,22 +1614,21 @@ impl Service {
 
     /// Returns Ok if the acl allows the server
     pub fn acl_check(&self, server_name: &ServerName, room_id: &RoomId) -> Result<()> {
-        let acl_event = match services().rooms.state_accessor.room_state_get(
+        let Some(acl_event) = services().rooms.state_accessor.room_state_get(
             room_id,
             &StateEventType::RoomServerAcl,
             "",
-        )? {
+        )?
-            Some(acl) => acl,
+        else {
-            None => return Ok(()),
+            return Ok(());
         };
 
         let acl_event_content: RoomServerAclEventContent =
-            match serde_json::from_str(acl_event.content.get()) {
+            if let Ok(content) = serde_json::from_str(acl_event.content.get()) {
-                Ok(content) => content,
+                content
-                Err(_) => {
+            } else {
                 warn!("Invalid ACL event");
                 return Ok(());
-                }
             };
 
         if acl_event_content.allow.is_empty() {
@@ -1693,9 +1669,9 @@ impl Service {
             .get(origin)
             .map(|s| Arc::clone(s).acquire_owned());
 
-        let permit = match permit {
+        let permit = if let Some(permit) = permit {
-            Some(p) => p,
+            permit
-            None => {
+        } else {
             let mut write = services().globals.servername_ratelimiter.write().await;
             let s = Arc::clone(
                 write
@@ -1705,7 +1681,6 @@ impl Service {
 
             s.acquire_owned()
         }
-        }
         .await;
 
         let back_off = |id| async {

src/service/rooms/pdu_metadata/mod.rs

@@ -46,8 +46,8 @@ impl Service {
         sender_user: &UserId,
         room_id: &RoomId,
         target: &EventId,
-        filter_event_type: Option<TimelineEventType>,
+        filter_event_type: &Option<TimelineEventType>,
-        filter_rel_type: Option<RelationType>,
+        filter_rel_type: &Option<RelationType>,
         from: PduCount,
         to: Option<PduCount>,
         limit: usize,

src/service/rooms/short/data.rs

@@ -22,7 +22,7 @@ pub trait Data: Send + Sync {
 
     fn get_statekey_from_short(&self, shortstatekey: u64) -> Result<(StateEventType, String)>;
 
-    /// Returns (shortstatehash, already_existed)
+    /// Returns (shortstatehash, `already_existed`)
     fn get_or_create_shortstatehash(&self, state_hash: &[u8]) -> Result<(u64, bool)>;
 
     fn get_shortroomid(&self, room_id: &RoomId) -> Result<Option<u64>>;

src/service/rooms/short/mod.rs

@@ -39,7 +39,7 @@ impl Service {
         self.db.get_statekey_from_short(shortstatekey)
     }
 
-    /// Returns (shortstatehash, already_existed)
+    /// Returns (shortstatehash, `already_existed`)
     pub fn get_or_create_shortstatehash(&self, state_hash: &[u8]) -> Result<(u64, bool)> {
         self.db.get_or_create_shortstatehash(state_hash)
     }

src/service/rooms/spaces/mod.rs

@@ -63,13 +63,13 @@ impl Service {
         let mut results = Vec::new();
 
         while let Some(current_room) = {
-            while stack.last().map_or(false, |s| s.is_empty()) {
+            while stack.last().map_or(false, Vec::is_empty) {
                 stack.pop();
             }
-            if !stack.is_empty() {
+            if stack.is_empty() {
-                stack.last_mut().and_then(|s| s.pop())
-            } else {
                 None
+            } else {
+                stack.last_mut().and_then(Vec::pop)
             }
         } {
             rooms_in_path.push(current_room.clone());
@@ -81,7 +81,7 @@ impl Service {
                 .roomid_spacechunk_cache
                 .lock()
                 .await
-                .get_mut(&current_room.to_owned())
+                .get_mut(&current_room.clone())
                 .as_ref()
             {
                 if let Some(cached) = cached {
@@ -202,7 +202,7 @@ impl Service {
                     .send_federation_request(
                         server,
                         federation::space::get_hierarchy::v1::Request {
-                            room_id: current_room.to_owned(),
+                            room_id: current_room.clone(),
                             suggested_only,
                         },
                     )
@@ -453,8 +453,7 @@ impl Service {
         room_id: &RoomId,
     ) -> Result<bool> {
         let allowed = match join_rule {
-            SpaceRoomJoinRule::Public => true,
+            SpaceRoomJoinRule::Knock | SpaceRoomJoinRule::Public => true,
-            SpaceRoomJoinRule::Knock => true,
             SpaceRoomJoinRule::Invite => services()
                 .rooms
                 .state_cache

src/service/rooms/state/data.rs

@@ -7,7 +7,7 @@ pub trait Data: Send + Sync {
     /// Returns the last state hash key added to the db for the given room.
     fn get_room_shortstatehash(&self, room_id: &RoomId) -> Result<Option<u64>>;
 
-    /// Set the state hash to a new version, but does not update state_cache.
+    /// Set the state hash to a new version, but does not update `state_cache`.
     fn set_room_state(
         &self,
         room_id: &RoomId,
@@ -18,7 +18,7 @@ pub trait Data: Send + Sync {
     /// Associates a state with an event.
     fn set_event_state(&self, shorteventid: u64, shortstatehash: u64) -> Result<()>;
 
-    /// Returns all events we would send as the prev_events of the next event.
+    /// Returns all events we would send as the `prev_events` of the next event.
     fn get_forward_extremities(&self, room_id: &RoomId) -> Result<HashSet<Arc<EventId>>>;
 
     /// Replace the forward extremities of the room.

src/service/rooms/state/mod.rs

@@ -45,9 +45,8 @@ impl Service {
                 .ok()
                 .map(|(_, id)| id)
         }) {
-            let pdu = match services().rooms.timeline.get_pdu_json(&event_id)? {
+            let Some(pdu) = services().rooms.timeline.get_pdu_json(&event_id)? else {
-                Some(pdu) => pdu,
+                continue;
-                None => continue,
             };
 
             let pdu: PduEvent = match serde_json::from_str(
@@ -70,14 +69,12 @@ impl Service {
                             Err(_) => continue,
                         };
 
-                    let state_key = match pdu.state_key {
+                    let Some(state_key) = pdu.state_key else {
-                        Some(k) => k,
+                        continue;
-                        None => continue,
                     };
 
-                    let user_id = match UserId::parse(state_key) {
+                    let Ok(user_id) = UserId::parse(state_key) else {
-                        Ok(id) => id,
+                        continue;
-                        Err(_) => continue,
                     };
 
                     services().rooms.state_cache.update_membership(
@@ -374,11 +371,7 @@ impl Service {
         state_key: Option<&str>,
         content: &serde_json::value::RawValue,
     ) -> Result<StateMap<Arc<PduEvent>>> {
-        let shortstatehash = if let Some(current_shortstatehash) =
+        let Some(shortstatehash) = services().rooms.state.get_room_shortstatehash(room_id)? else {
-            services().rooms.state.get_room_shortstatehash(room_id)?
-        {
-            current_shortstatehash
-        } else {
             return Ok(HashMap::new());
         };
 

src/service/rooms/state_accessor/mod.rs

@@ -85,16 +85,15 @@ impl Service {
     /// The user was a joined member at this state (potentially in the past)
     fn user_was_joined(&self, shortstatehash: u64, user_id: &UserId) -> bool {
         self.user_membership(shortstatehash, user_id)
-            .map(|s| s == MembershipState::Join)
+            .is_ok_and(|s| s == MembershipState::Join) // Return sensible default, i.e. false
-            .unwrap_or_default() // Return sensible default, i.e. false
     }
 
     /// The user was an invited or joined room member at this state (potentially
     /// in the past)
     fn user_was_invited(&self, shortstatehash: u64, user_id: &UserId) -> bool {
         self.user_membership(shortstatehash, user_id)
-            .map(|s| s == MembershipState::Join || s == MembershipState::Invite)
+            .is_ok_and(|s| s == MembershipState::Join || s == MembershipState::Invite)
-            .unwrap_or_default() // Return sensible default, i.e. false
+        // Return sensible default, i.e. false
     }
 
     /// Whether a server is allowed to see an event through federation, based on
@@ -106,9 +105,8 @@ impl Service {
         room_id: &RoomId,
         event_id: &EventId,
     ) -> Result<bool> {
-        let shortstatehash = match self.pdu_shortstatehash(event_id)? {
+        let Some(shortstatehash) = self.pdu_shortstatehash(event_id)? else {
-            Some(shortstatehash) => shortstatehash,
+            return Ok(true);
-            None => return Ok(true),
         };
 
         if let Some(visibility) = self
@@ -170,9 +168,8 @@ impl Service {
         room_id: &RoomId,
         event_id: &EventId,
     ) -> Result<bool> {
-        let shortstatehash = match self.pdu_shortstatehash(event_id)? {
+        let Some(shortstatehash) = self.pdu_shortstatehash(event_id)? else {
-            Some(shortstatehash) => shortstatehash,
+            return Ok(true);
-            None => return Ok(true),
         };
 
         if let Some(visibility) = self
@@ -305,13 +302,13 @@ impl Service {
             })
     }
 
-    pub async fn user_can_invite(
+    pub fn user_can_invite(
         &self,
         room_id: &RoomId,
         sender: &UserId,
         target_user: &UserId,
         state_lock: &MutexGuard<'_, ()>,
-    ) -> Result<bool> {
+    ) -> bool {
         let content = to_raw_value(&RoomMemberEventContent::new(MembershipState::Invite))
             .expect("Event content always serializes");
 
@@ -323,11 +320,11 @@ impl Service {
             redacts: None,
         };
 
-        Ok(services()
+        services()
             .rooms
             .timeline
             .create_hash_and_sign_event(new_event, sender, room_id, state_lock)
-            .is_ok())
+            .is_ok()
     }
 
     pub fn get_member(
@@ -358,13 +355,32 @@ impl Service {
         federation: bool,
     ) -> Result<bool> {
         self.room_state_get(room_id, &StateEventType::RoomPowerLevels, "")?
-            .map(|e| {
+            .map_or_else(
+                // Falling back on m.room.create to judge power levels
+                || {
+                    if let Some(pdu) =
+                        self.room_state_get(room_id, &StateEventType::RoomCreate, "")?
+                    {
+                        Ok(pdu.sender == sender
+                            || if let Ok(Some(pdu)) = services().rooms.timeline.get_pdu(redacts) {
+                                pdu.sender == sender
+                            } else {
+                                false
+                            })
+                    } else {
+                        Err(Error::bad_database(
+                            "No m.room.power_levels or m.room.create events in database for room",
+                        ))
+                    }
+                },
+                |e| {
                     serde_json::from_str(e.content.get())
                         .map(|c: RoomPowerLevelsEventContent| c.into())
                         .map(|e: RoomPowerLevels| {
                             e.user_can_redact_event_of_other(sender)
                                 || e.user_can_redact_own_event(sender)
-                                && if let Ok(Some(pdu)) = services().rooms.timeline.get_pdu(redacts)
+                                    && if let Ok(Some(pdu)) =
+                                        services().rooms.timeline.get_pdu(redacts)
                                     {
                                         if federation {
                                             pdu.sender().server_name() == sender.server_name()
@@ -378,21 +394,7 @@ impl Service {
                         .map_err(|_| {
                             Error::bad_database("Invalid m.room.power_levels event in database")
                         })
-            })
+                },
-            // Falling back on m.room.create to judge power levels
+            )
-            .unwrap_or_else(|| {
-                if let Some(pdu) = self.room_state_get(room_id, &StateEventType::RoomCreate, "")? {
-                    Ok(pdu.sender == sender
-                        || if let Ok(Some(pdu)) = services().rooms.timeline.get_pdu(redacts) {
-                            pdu.sender == sender
-                        } else {
-                            false
-                        })
-                } else {
-                    Err(Error::bad_database(
-                        "No m.room.power_levels or m.room.create events in database for room",
-                    ))
-                }
-            })
     }
 }

src/service/rooms/threads/mod.rs

@@ -1,5 +1,7 @@
 mod data;
 
+use std::collections::BTreeMap;
+
 pub use data::Data;
 use ruma::{
     api::client::{error::ErrorKind, threads::get_threads::v1::IncludeThreads},
@@ -56,7 +58,7 @@ impl Service {
 
         if let CanonicalJsonValue::Object(unsigned) = root_pdu_json
             .entry("unsigned".to_owned())
-            .or_insert_with(|| CanonicalJsonValue::Object(Default::default()))
+            .or_insert_with(|| CanonicalJsonValue::Object(BTreeMap::default()))
         {
             if let Some(mut relations) = unsigned
                 .get("m.relations")

src/service/rooms/timeline/mod.rs

@@ -204,6 +204,23 @@ impl Service {
         leaves: Vec<OwnedEventId>,
         state_lock: &MutexGuard<'_, ()>, // Take mutex guard to make sure users get the room state mutex
     ) -> Result<Vec<u8>> {
+        // Update Relationships
+        #[derive(Deserialize)]
+        struct ExtractRelatesTo {
+            #[serde(rename = "m.relates_to")]
+            relates_to: Relation,
+        }
+
+        #[derive(Clone, Debug, Deserialize)]
+        struct ExtractEventId {
+            event_id: OwnedEventId,
+        }
+        #[derive(Clone, Debug, Deserialize)]
+        struct ExtractRelatesToEventId {
+            #[serde(rename = "m.relates_to")]
+            relates_to: ExtractEventId,
+        }
+
         let shortroomid = services()
             .rooms
             .short
@@ -216,7 +233,7 @@ impl Service {
         if let Some(state_key) = &pdu.state_key {
             if let CanonicalJsonValue::Object(unsigned) = pdu_json
                 .entry("unsigned".to_owned())
-                .or_insert_with(|| CanonicalJsonValue::Object(Default::default()))
+                .or_insert_with(|| CanonicalJsonValue::Object(BTreeMap::default()))
             {
                 if let Some(shortstatehash) = services()
                     .rooms
@@ -340,8 +357,10 @@ impl Service {
                         .map_err(|_| Error::bad_database("Invalid push rules event in db."))
                 })
                 .transpose()?
-                .map(|ev: PushRulesEvent| ev.content.global)
+                .map_or_else(
-                .unwrap_or_else(|| Ruleset::server_default(user));
+                    || Ruleset::server_default(user),
+                    |ev: PushRulesEvent| ev.content.global,
+                );
 
             let mut highlight = false;
             let mut notify = false;
@@ -505,23 +524,6 @@ impl Service {
             _ => {}
         }
 
-        // Update Relationships
-        #[derive(Deserialize)]
-        struct ExtractRelatesTo {
-            #[serde(rename = "m.relates_to")]
-            relates_to: Relation,
-        }
-
-        #[derive(Clone, Debug, Deserialize)]
-        struct ExtractEventId {
-            event_id: OwnedEventId,
-        }
-        #[derive(Clone, Debug, Deserialize)]
-        struct ExtractRelatesToEventId {
-            #[serde(rename = "m.relates_to")]
-            relates_to: ExtractEventId,
-        }
-
         if let Ok(content) = serde_json::from_str::<ExtractRelatesToEventId>(pdu.content.get()) {
             if let Some(related_pducount) = services()
                 .rooms
@@ -786,7 +788,7 @@ impl Service {
             &mut pdu_json,
             &room_version_id,
         ) {
-            Ok(_) => {}
+            Ok(()) => {}
             Err(e) => {
                 return match e {
                     ruma::signatures::Error::PduSize => Err(Error::BadRequest(
@@ -857,7 +859,7 @@ impl Service {
                             .filter(|v| v.starts_with('@'))
                             .unwrap_or(sender.as_str());
                         let server_name = services().globals.server_name();
-                        let server_user = format!("@conduit:{}", server_name);
+                        let server_user = format!("@conduit:{server_name}");
                         let content = serde_json::from_str::<ExtractMembership>(pdu.content.get())
                             .map_err(|_| Error::bad_database("Invalid content in pdu."))?;
 
@@ -1199,7 +1201,7 @@ impl Service {
                 .roomid_mutex_federation
                 .write()
                 .await
-                .entry(room_id.to_owned())
+                .entry(room_id.clone())
                 .or_default(),
         );
         let mutex_lock = mutex.lock().await;

src/service/sending/mod.rs

@@ -160,7 +160,9 @@ impl Service {
                             // Find events that have been added since starting the last request
                             let new_events = self.db.queued_requests(&outgoing_kind).filter_map(|r| r.ok()).take(30).collect::<Vec<_>>();
 
-                            if !new_events.is_empty() {
+                            if new_events.is_empty() {
+                                current_transaction_status.remove(&outgoing_kind);
+                            } else {
                                 // Insert pdus we found
                                 self.db.mark_as_active(&new_events)?;
 
@@ -170,8 +172,6 @@ impl Service {
                                         new_events.into_iter().map(|(event, _)| event).collect(),
                                     )
                                 );
-                            } else {
-                                current_transaction_status.remove(&outgoing_kind);
                             }
                         }
                         Err((outgoing_kind, _)) => {
@@ -305,8 +305,7 @@ impl Service {
                 let event: AnySyncEphemeralRoomEvent =
                     serde_json::from_str(read_receipt.json().get())
                         .map_err(|_| Error::bad_database("Invalid edu event in read_receipts."))?;
-                let federation_event = match event {
+                let federation_event = if let AnySyncEphemeralRoomEvent::Receipt(r) = event {
-                    AnySyncEphemeralRoomEvent::Receipt(r) => {
                     let mut read = BTreeMap::new();
 
                     let (event_id, mut receipt) = r
@@ -335,11 +334,9 @@ impl Service {
                     receipts.insert(room_id.clone(), receipt_map);
 
                     Edu::Receipt(ReceiptContent { receipts })
-                    }
+                } else {
-                    _ => {
                     Error::bad_database("Invalid event type in read_receipts");
                     continue;
-                    }
                 };
 
                 events.push(serde_json::to_vec(&federation_event).expect("json can be serialized"));
@@ -404,7 +401,7 @@ impl Service {
         )?;
         for ((outgoing_kind, event), key) in requests.into_iter().zip(keys) {
             self.sender
-                .send((outgoing_kind.to_owned(), event, key))
+                .send((outgoing_kind.clone(), event, key))
                 .unwrap();
         }
 
@@ -474,7 +471,7 @@ impl Service {
                                         ),
                                     )
                                 })?
-                                .to_room_event())
+                                .to_room_event());
                         }
                         SendingEventType::Edu(_) => {
                             // Appservices don't need EDUs (?)
@@ -559,13 +556,12 @@ impl Service {
                         }
                     }
 
-                    let pusher = match services()
+                    let Some(pusher) = services()
                         .pusher
                         .get_pusher(userid, pushkey)
                         .map_err(|e| (OutgoingKind::Push(userid.clone(), pushkey.clone()), e))?
-                    {
+                    else {
-                        Some(pusher) => pusher,
+                        continue;
-                        None => continue,
                     };
 
                     let rules_for_user = services()
@@ -577,8 +573,10 @@ impl Service {
                         )
                         .unwrap_or_default()
                         .and_then(|event| serde_json::from_str::<PushRulesEvent>(event.get()).ok())
-                        .map(|ev: PushRulesEvent| ev.content.global)
+                        .map_or_else(
-                        .unwrap_or_else(|| push::Ruleset::server_default(userid));
+                            || push::Ruleset::server_default(userid),
+                            |ev: PushRulesEvent| ev.content.global,
+                        );
 
                     let unread: UInt = services()
                         .rooms

src/service/uiaa/mod.rs

@@ -47,10 +47,10 @@ impl Service {
         auth: &AuthData,
         uiaainfo: &UiaaInfo,
     ) -> Result<(bool, UiaaInfo)> {
-        let mut uiaainfo = auth
+        let mut uiaainfo = auth.session().map_or_else(
-            .session()
+            || Ok(uiaainfo.clone()),
-            .map(|session| self.db.get_uiaa_session(user_id, device_id, session))
+            |session| self.db.get_uiaa_session(user_id, device_id, session),
-            .unwrap_or_else(|| Ok(uiaainfo.clone()))?;
+        )?;
 
         if uiaainfo.session.is_none() {
             uiaainfo.session = Some(utils::random_string(SESSION_ID_LENGTH));
@@ -63,14 +63,11 @@ impl Service {
                 password,
                 ..
             }) => {
-                let username = match identifier {
+                let UserIdentifier::UserIdOrLocalpart(username) = identifier else {
-                    UserIdentifier::UserIdOrLocalpart(username) => username,
-                    _ => {
                     return Err(Error::BadRequest(
                         ErrorKind::Unrecognized,
                         "Identifier type not recognized.",
-                        ))
+                    ));
-                    }
                 };
 
                 let user_id = UserId::parse_with_server_name(

src/service/users/data.rs

@@ -42,16 +42,16 @@ pub trait Data: Send + Sync {
     /// Sets a new displayname or removes it if displayname is None. You still need to nofify all rooms of this change.
     fn set_displayname(&self, user_id: &UserId, displayname: Option<String>) -> Result<()>;
 
-    /// Get the avatar_url of a user.
+    /// Get the `avatar_url` of a user.
     fn avatar_url(&self, user_id: &UserId) -> Result<Option<OwnedMxcUri>>;
 
-    /// Sets a new avatar_url or removes it if avatar_url is None.
+    /// Sets a new `avatar_url` or removes it if `avatar_url` is None.
     fn set_avatar_url(&self, user_id: &UserId, avatar_url: Option<OwnedMxcUri>) -> Result<()>;
 
     /// Get the blurhash of a user.
     fn blurhash(&self, user_id: &UserId) -> Result<Option<String>>;
 
-    /// Sets a new avatar_url or removes it if avatar_url is None.
+    /// Sets a new `avatar_url` or removes it if `avatar_url` is None.
     fn set_blurhash(&self, user_id: &UserId, blurhash: Option<String>) -> Result<()>;
 
     /// Adds a new device to a user.

src/service/users/mod.rs

@@ -325,12 +325,12 @@ impl Service {
         self.db.set_displayname(user_id, displayname)
     }
 
-    /// Get the avatar_url of a user.
+    /// Get the `avatar_url` of a user.
     pub fn avatar_url(&self, user_id: &UserId) -> Result<Option<OwnedMxcUri>> {
         self.db.avatar_url(user_id)
     }
 
-    /// Sets a new avatar_url or removes it if avatar_url is None.
+    /// Sets a new `avatar_url` or removes it if `avatar_url` is None.
     pub fn set_avatar_url(&self, user_id: &UserId, avatar_url: Option<OwnedMxcUri>) -> Result<()> {
         self.db.set_avatar_url(user_id, avatar_url)
     }
@@ -340,7 +340,7 @@ impl Service {
         self.db.blurhash(user_id)
     }
 
-    /// Sets a new avatar_url or removes it if avatar_url is None.
+    /// Sets a new `avatar_url` or removes it if `avatar_url` is None.
     pub fn set_blurhash(&self, user_id: &UserId, blurhash: Option<String>) -> Result<()> {
         self.db.set_blurhash(user_id, blurhash)
     }

src/utils/error.rs

@@ -71,7 +71,7 @@ pub enum Error {
     #[error("{0}")]
     BadConfig(&'static str),
     #[error("{0}")]
-    /// Don't create this directly. Use Error::bad_database instead.
+    /// Don't create this directly. Use `Error::bad_database` instead.
     BadDatabase(&'static str),
     #[error("uiaa")]
     Uiaa(UiaaInfo),
@@ -107,6 +107,9 @@ impl Error {
 
 impl Error {
     pub fn to_response(&self) -> RumaResponse<UiaaResponse> {
+        #[allow(clippy::enum_glob_use)]
+        use ErrorKind::*;
+
         if let Self::Uiaa(uiaainfo) = self {
             return RumaResponse(UiaaResponse::AuthResponse(uiaainfo.clone()));
         }
@@ -122,20 +125,19 @@ impl Error {
 
         let message = format!("{self}");
 
-        use ErrorKind::*;
         let (kind, status_code) = match self {
             Self::BadRequest(kind, _) => (
                 kind.clone(),
                 match kind {
-                    WrongRoomKeysVersion { .. }
+                    Unauthorized | UnknownToken { .. } | MissingToken => StatusCode::UNAUTHORIZED,
+                    NotFound | Unrecognized => StatusCode::NOT_FOUND,
+                    LimitExceeded { .. } => StatusCode::TOO_MANY_REQUESTS,
+                    UserDeactivated
+                    | WrongRoomKeysVersion { .. }
                     | Forbidden
                     | GuestAccessForbidden
                     | ThreepidAuthFailed
                     | ThreepidDenied => StatusCode::FORBIDDEN,
-                    Unauthorized | UnknownToken { .. } | MissingToken => StatusCode::UNAUTHORIZED,
-                    NotFound | Unrecognized => StatusCode::NOT_FOUND,
-                    LimitExceeded { .. } => StatusCode::TOO_MANY_REQUESTS,
-                    UserDeactivated => StatusCode::FORBIDDEN,
                     TooLarge => StatusCode::PAYLOAD_TOO_LARGE,
                     _ => StatusCode::BAD_REQUEST,
                 },

src/utils/mod.rs

@@ -18,8 +18,8 @@ pub fn millis_since_unix_epoch() -> u64 {
         .as_millis() as u64
 }
 
-pub fn increment(old: Option<&[u8]>) -> Option<Vec<u8>> {
+pub fn increment(old: Option<&[u8]>) -> Vec<u8> {
-    let number = match old.map(|bytes| bytes.try_into()) {
+    let number = match old.map(TryInto::try_into) {
         Some(Ok(bytes)) => {
             let number = u64::from_be_bytes(bytes);
             number + 1
@@ -27,7 +27,7 @@ pub fn increment(old: Option<&[u8]>) -> Option<Vec<u8>> {
         _ => 1, // Start at one. since 0 should return the first event in the db
     };
 
-    Some(number.to_be_bytes().to_vec())
+    number.to_be_bytes().to_vec()
 }
 
 pub fn generate_keypair() -> Vec<u8> {
@@ -83,7 +83,7 @@ pub fn common_elements(
     check_order: impl Fn(&[u8], &[u8]) -> Ordering,
 ) -> Option<impl Iterator<Item = Vec<u8>>> {
     let first_iterator = iterators.next()?;
-    let mut other_iterators = iterators.map(|i| i.peekable()).collect::<Vec<_>>();
+    let mut other_iterators = iterators.map(Iterator::peekable).collect::<Vec<_>>();
 
     Some(first_iterator.filter(move |target| {
         other_iterators.iter_mut().all(|it| {