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apipanic.go
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apipanic.go
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// Copyright 2018-2019 Authors of Cilium
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package api
import (
"net/http"
"os"
"runtime/debug"
"github.com/cilium/cilium/pkg/logging"
"github.com/sirupsen/logrus"
)
// APIPanicHandler recovers from API panics and logs encountered panics
type APIPanicHandler struct {
Next http.Handler
}
// ServeHTTP implements the http.Handler interface.
// It recovers from panics of all next handlers and logs them
func (h *APIPanicHandler) ServeHTTP(wr http.ResponseWriter, req *http.Request) {
defer func() {
if r := recover(); r != nil {
fields := logrus.Fields{
"panic_message": r,
"url": req.URL.String(),
"method": req.Method,
"client": req.RemoteAddr,
}
log.WithFields(fields).Warn("Cilium API handler panicked")
if logging.DefaultLogger.IsLevelEnabled(logrus.DebugLevel) {
os.Stdout.Write(debug.Stack())
}
wr.WriteHeader(http.StatusInternalServerError)
if _, err := wr.Write([]byte("Internal error occurred, check Cilium logs for details.")); err != nil {
log.WithError(err).Debug("Failed to write API response")
}
}
}()
h.Next.ServeHTTP(wr, req)
}