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// Copyright 2015 The etcd Authors
//
// 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 v2http
import (
"net/http"
"strconv"
"time"
"go.etcd.io/etcd/api/v3/etcdserverpb"
"go.etcd.io/etcd/server/v3/etcdserver/api/v2error"
"go.etcd.io/etcd/server/v3/etcdserver/api/v2http/httptypes"
"github.com/prometheus/client_golang/prometheus"
)
var (
incomingEvents = prometheus.NewCounterVec(
prometheus.CounterOpts{
Namespace: "etcd",
Subsystem: "http",
Name: "received_total",
Help: "Counter of requests received into the system (successfully parsed and authd).",
}, []string{"method"})
failedEvents = prometheus.NewCounterVec(
prometheus.CounterOpts{
Namespace: "etcd",
Subsystem: "http",
Name: "failed_total",
Help: "Counter of handle failures of requests (non-watches), by method (GET/PUT etc.) and code (400, 500 etc.).",
}, []string{"method", "code"})
successfulEventsHandlingSec = prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Namespace: "etcd",
Subsystem: "http",
Name: "successful_duration_seconds",
Help: "Bucketed histogram of processing time (s) of successfully handled requests (non-watches), by method (GET/PUT etc.).",
// lowest bucket start of upper bound 0.0005 sec (0.5 ms) with factor 2
// highest bucket start of 0.0005 sec * 2^12 == 2.048 sec
Buckets: prometheus.ExponentialBuckets(0.0005, 2, 13),
}, []string{"method"})
)
func init() {
prometheus.MustRegister(incomingEvents)
prometheus.MustRegister(failedEvents)
prometheus.MustRegister(successfulEventsHandlingSec)
}
func reportRequestReceived(request etcdserverpb.Request) {
incomingEvents.WithLabelValues(methodFromRequest(request)).Inc()
}
func reportRequestCompleted(request etcdserverpb.Request, startTime time.Time) {
method := methodFromRequest(request)
successfulEventsHandlingSec.WithLabelValues(method).Observe(time.Since(startTime).Seconds())
}
func reportRequestFailed(request etcdserverpb.Request, err error) {
method := methodFromRequest(request)
failedEvents.WithLabelValues(method, strconv.Itoa(codeFromError(err))).Inc()
}
func methodFromRequest(request etcdserverpb.Request) string {
if request.Method == "GET" && request.Quorum {
return "QGET"
}
return request.Method
}
func codeFromError(err error) int {
if err == nil {
return http.StatusInternalServerError
}
switch e := err.(type) {
case *v2error.Error:
return e.StatusCode()
case *httptypes.HTTPError:
return e.Code
default:
return http.StatusInternalServerError
}
}
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