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metrics.go
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metrics.go
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// Copyright 2017 Corey Scott http://www.sage42.org/
//
// 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"
"strconv"
"time"
"github.com/corsc/go-commons/http/middleware/httputil"
)
// MetricsClient allows for tracking the endpoint via StatsD or similar
type MetricsClient interface {
Duration(key string, start time.Time, tags ...string)
}
// Duration will track the duration (and usage) of the method.
// It is based on statsD but it could be used with other metrics clients.
// Note: this middleware should typically be applied first (in order to run last)
func Duration(handler http.Handler, metrics MetricsClient, extraTags ...string) http.HandlerFunc {
return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
defer metrics.Duration("api", time.Now(), extraTags...)
handler.ServeHTTP(resp, req)
})
}
// DurationStatus is similar to Duration but also tracks the HTTP response code (via tags)
// It is based on statsD but it could be used with other metrics clients.
// Note: this middleware should typically be applied first (in order to run last)
func DurationStatus(handler http.Handler, metrics MetricsClient, extraTags ...string) http.HandlerFunc {
return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
start := time.Now()
// create a new response writer to catch the response code
crw := httputil.NewCustomResponseWriter(resp, false)
handler.ServeHTTP(crw, req)
metrics.Duration("api", start, append(extraTags, "status:"+strconv.Itoa(crw.Status()))...)
})
}