api/pkg/middleware/recover.go

// Copyright 2021 Google LLC
//
// 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 middleware

import (
	"net/http"

	"github.com/rs/zerolog/log"
)

// Recover returns a middleware to recover from panics
func Recover() func(http.Handler) http.Handler {
	return func(next http.Handler) http.Handler {
		fn := func(w http.ResponseWriter, r *http.Request) {
			defer func() {
				if rvr := recover(); rvr != nil && rvr != http.ErrAbortHandler {
					logger := log.Ctx(r.Context())
					logger.Error().Msgf("recover from: %v", rvr)
					http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
				}
			}()

			next.ServeHTTP(w, r)
		}

		return http.HandlerFunc(fn)
	}
}