traefik/pkg/middlewares/recovery/recovery.go
Julien Salleyron a90b2a672e
perf: improve forwarded header and recovery middlewares
Co-authored-by: Ludovic Fernandez <ldez@users.noreply.github.com>
2021-01-21 10:04:04 +01:00

58 lines
1.7 KiB
Go

package recovery
import (
"context"
"net/http"
"runtime"
"github.com/traefik/traefik/v2/pkg/log"
"github.com/traefik/traefik/v2/pkg/middlewares"
)
const (
typeName = "Recovery"
middlewareName = "traefik-internal-recovery"
)
type recovery struct {
next http.Handler
}
// New creates recovery middleware.
func New(ctx context.Context, next http.Handler) (http.Handler, error) {
log.FromContext(middlewares.GetLoggerCtx(ctx, middlewareName, typeName)).Debug("Creating middleware")
return &recovery{
next: next,
}, nil
}
func (re *recovery) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
defer recoverFunc(rw, req)
re.next.ServeHTTP(rw, req)
}
func recoverFunc(rw http.ResponseWriter, r *http.Request) {
if err := recover(); err != nil {
logger := log.FromContext(middlewares.GetLoggerCtx(r.Context(), middlewareName, typeName))
if !shouldLogPanic(err) {
logger.Debugf("Request has been aborted [%s - %s]: %v", r.RemoteAddr, r.URL, err)
return
}
logger.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)]
logger.Errorf("Stack: %s", buf)
http.Error(rw, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
}
}
// 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 {
//nolint:errorlint // false-positive because panicValue is an interface.
return panicValue != nil && panicValue != http.ErrAbortHandler
}