traefik/pkg/middlewares/recovery/recovery.go

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package recovery
import (
"context"
"net/http"
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"runtime"
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"github.com/traefik/traefik/v2/pkg/log"
"github.com/traefik/traefik/v2/pkg/middlewares"
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)
const (
typeName = "Recovery"
)
type recovery struct {
next http.Handler
name string
}
// New creates recovery middleware.
func New(ctx context.Context, next http.Handler, name string) (http.Handler, error) {
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log.FromContext(middlewares.GetLoggerCtx(ctx, name, typeName)).Debug("Creating middleware")
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return &recovery{
next: next,
name: name,
}, nil
}
func (re *recovery) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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defer recoverFunc(middlewares.GetLoggerCtx(req.Context(), re.name, typeName), rw, req)
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re.next.ServeHTTP(rw, req)
}
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func recoverFunc(ctx context.Context, rw http.ResponseWriter, r *http.Request) {
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if err := recover(); err != nil {
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if !shouldLogPanic(err) {
log.FromContext(ctx).Debugf("Request has been aborted [%s - %s]: %v", r.RemoteAddr, r.URL, err)
return
}
log.FromContext(ctx).Errorf("Recovered from panic in HTTP handler [%s - %s]: %+v", r.RemoteAddr, r.URL, err)
const size = 64 << 10
buf := make([]byte, size)
buf = buf[:runtime.Stack(buf, false)]
log.FromContext(ctx).Errorf("Stack: %s", buf)
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http.Error(rw, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
}
}
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// https://github.com/golang/go/blob/a0d6420d8be2ae7164797051ec74fa2a2df466a1/src/net/http/server.go#L1761-L1775
// https://github.com/golang/go/blob/c33153f7b416c03983324b3e8f869ce1116d84bc/src/net/http/httputil/reverseproxy.go#L284
func shouldLogPanic(panicValue interface{}) bool {
return panicValue != nil && panicValue != http.ErrAbortHandler
}