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fileserver: When out of filedescriptors, spread retry attempts

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This commit is contained in:
W-Mark Kubacki 2016-04-16 20:59:24 +02:00
parent 4a6121f989
commit 3513b6f2f7
1 changed files with 4 additions and 1 deletions
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5
middleware/fileserver.go
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@ -2,10 +2,12 @@ package middleware
import ( import (
"fmt" "fmt"
"math/rand"
"net/http" "net/http"
"os" "os"
"path" "path"
"path/filepath" "path/filepath"
"strconv"
"strings" "strings"
) )
@ -65,7 +67,8 @@ func (fh *fileHandler) serveFile(w http.ResponseWriter, r *http.Request, name st
return http.StatusForbidden, err return http.StatusForbidden, err
} }
// Likely the server is under load and ran out of file descriptors // Likely the server is under load and ran out of file descriptors
w.Header().Set("Retry-After", "5") // TODO: 5 seconds enough delay? Or too much? backoff := int(3 + rand.Int31()%3) // 3–5 seconds to prevent a stampede
w.Header().Set("Retry-After", strconv.Itoa(backoff))
return http.StatusServiceUnavailable, err return http.StatusServiceUnavailable, err
} }
defer f.Close() defer f.Close()