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9864b138fb
In v2.5.0, upstream health was fixed such that whether an upstream is considered healthy or not is mostly up to each individual handler's config. Since "healthy" is an opinion, it is not a global value. I unintentionally left in the "healthy" field in the API endpoint for checking upstreams, and it is now misleading (see #4792). However, num_requests and fails remains, so health can be determined by the API client, rather than having it be opaquely (and unhelpfully) determined for the client. If we do restore this value later on, it'd need to be replicated once per reverse_proxy handler according to their individual configs.
120 lines
3.1 KiB
Go
120 lines
3.1 KiB
Go
// Copyright 2015 Matthew Holt and The Caddy Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package reverseproxy
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"github.com/caddyserver/caddy/v2"
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)
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func init() {
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caddy.RegisterModule(adminUpstreams{})
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}
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// adminUpstreams is a module that provides the
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// /reverse_proxy/upstreams endpoint for the Caddy admin
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// API. This allows for checking the health of configured
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// reverse proxy upstreams in the pool.
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type adminUpstreams struct{}
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// upstreamResults holds the status of a particular upstream
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type upstreamStatus struct {
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Address string `json:"address"`
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NumRequests int `json:"num_requests"`
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Fails int `json:"fails"`
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}
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// CaddyModule returns the Caddy module information.
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func (adminUpstreams) CaddyModule() caddy.ModuleInfo {
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return caddy.ModuleInfo{
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ID: "admin.api.reverse_proxy",
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New: func() caddy.Module { return new(adminUpstreams) },
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}
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}
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// Routes returns a route for the /reverse_proxy/upstreams endpoint.
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func (al adminUpstreams) Routes() []caddy.AdminRoute {
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return []caddy.AdminRoute{
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{
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Pattern: "/reverse_proxy/upstreams",
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Handler: caddy.AdminHandlerFunc(al.handleUpstreams),
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},
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}
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}
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// handleUpstreams reports the status of the reverse proxy
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// upstream pool.
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func (adminUpstreams) handleUpstreams(w http.ResponseWriter, r *http.Request) error {
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if r.Method != http.MethodGet {
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return caddy.APIError{
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HTTPStatus: http.StatusMethodNotAllowed,
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Err: fmt.Errorf("method not allowed"),
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}
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}
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// Prep for a JSON response
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w.Header().Set("Content-Type", "application/json")
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enc := json.NewEncoder(w)
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// Collect the results to respond with
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results := []upstreamStatus{}
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// Iterate over the upstream pool (needs to be fast)
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var rangeErr error
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hosts.Range(func(key, val interface{}) bool {
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address, ok := key.(string)
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if !ok {
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rangeErr = caddy.APIError{
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HTTPStatus: http.StatusInternalServerError,
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Err: fmt.Errorf("could not type assert upstream address"),
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}
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return false
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}
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upstream, ok := val.(*Host)
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if !ok {
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rangeErr = caddy.APIError{
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HTTPStatus: http.StatusInternalServerError,
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Err: fmt.Errorf("could not type assert upstream struct"),
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}
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return false
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}
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results = append(results, upstreamStatus{
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Address: address,
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NumRequests: upstream.NumRequests(),
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Fails: upstream.Fails(),
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})
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return true
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})
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// If an error happened during the range, return it
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if rangeErr != nil {
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return rangeErr
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}
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err := enc.Encode(results)
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if err != nil {
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return caddy.APIError{
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HTTPStatus: http.StatusInternalServerError,
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Err: err,
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}
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}
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return nil
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}
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