51 lines
1.5 KiB
Go
51 lines
1.5 KiB
Go
package middlewares
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import (
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"net/http"
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"runtime"
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"github.com/containous/traefik/log"
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"github.com/urfave/negroni"
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)
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// RecoverHandler recovers from a panic in http handlers
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func RecoverHandler(next http.Handler) http.Handler {
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fn := func(w http.ResponseWriter, r *http.Request) {
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defer recoverFunc(w, r)
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next.ServeHTTP(w, r)
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}
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return http.HandlerFunc(fn)
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}
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// NegroniRecoverHandler recovers from a panic in negroni handlers
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func NegroniRecoverHandler() negroni.Handler {
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fn := func(w http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
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defer recoverFunc(w, r)
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next.ServeHTTP(w, r)
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}
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return negroni.HandlerFunc(fn)
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}
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func recoverFunc(w http.ResponseWriter, r *http.Request) {
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if err := recover(); err != nil {
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if !shouldLogPanic(err) {
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log.Debugf("Request has been aborted [%s - %s]: %v", r.RemoteAddr, r.URL, err)
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return
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}
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log.Errorf("Recovered from panic in HTTP handler [%s - %s]: %+v", r.RemoteAddr, r.URL, err)
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const size = 64 << 10
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buf := make([]byte, size)
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buf = buf[:runtime.Stack(buf, false)]
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log.Errorf("Stack: %s", buf)
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http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
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}
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}
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// https://github.com/golang/go/blob/a0d6420d8be2ae7164797051ec74fa2a2df466a1/src/net/http/server.go#L1761-L1775
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// https://github.com/golang/go/blob/c33153f7b416c03983324b3e8f869ce1116d84bc/src/net/http/httputil/reverseproxy.go#L284
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func shouldLogPanic(panicValue interface{}) bool {
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return panicValue != nil && panicValue != http.ErrAbortHandler
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}
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