/
request_metrics.go
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/
request_metrics.go
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// Copyright (c) 2016-2018 iQIYI.com. All rights reserved.
//
// 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 (
"fmt"
"net/http"
"github.com/uber-go/tally"
)
type recordStatusWriter struct {
http.ResponseWriter
status int
}
func (mw *recordStatusWriter) WriteHeader(status int) {
mw.status = status
mw.ResponseWriter.WriteHeader(status)
}
func RequestMetrics(metricsScope tally.Scope) func(http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
w := &recordStatusWriter{ResponseWriter: writer}
next.ServeHTTP(w, request)
metricsScope.Counter("requests").Inc(1)
metricsScope.Counter(request.Method + "_requests").Inc(1)
metricsScope.Counter(fmt.Sprintf("%d_responses", w.status)).Inc(1)
})
}
}