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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 httpproxy
import (
"net/http"
"strconv"
"time"
"github.com/prometheus/client_golang/prometheus"
)
var (
requestsIncoming = prometheus.NewCounterVec(
prometheus.CounterOpts{
Namespace: "etcd",
Subsystem: "proxy",
Name: "requests_total",
Help: "Counter requests incoming by method.",
}, []string{"method"})
requestsHandled = prometheus.NewCounterVec(
prometheus.CounterOpts{
Namespace: "etcd",
Subsystem: "proxy",
Name: "handled_total",
Help: "Counter of requests fully handled (by authoratitave servers)",
}, []string{"method", "code"})
requestsDropped = prometheus.NewCounterVec(
prometheus.CounterOpts{
Namespace: "etcd",
Subsystem: "proxy",
Name: "dropped_total",
Help: "Counter of requests dropped on the proxy.",
}, []string{"method", "proxying_error"})
requestsHandlingSec = prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Namespace: "etcd",
Subsystem: "proxy",
Name: "handling_duration_seconds",
Help: "Bucketed histogram of handling time of successful events (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"})
)
type forwardingError string
const (
zeroEndpoints forwardingError = "zero_endpoints"
failedSendingRequest forwardingError = "failed_sending_request"
failedGettingResponse forwardingError = "failed_getting_response"
)
func init() {
prometheus.MustRegister(requestsIncoming)
prometheus.MustRegister(requestsHandled)
prometheus.MustRegister(requestsDropped)
prometheus.MustRegister(requestsHandlingSec)
}
func reportIncomingRequest(request *http.Request) {
requestsIncoming.WithLabelValues(request.Method).Inc()
}
func reportRequestHandled(request *http.Request, response *http.Response, startTime time.Time) {
method := request.Method
requestsHandled.WithLabelValues(method, strconv.Itoa(response.StatusCode)).Inc()
requestsHandlingSec.WithLabelValues(method).Observe(time.Since(startTime).Seconds())
}
func reportRequestDropped(request *http.Request, err forwardingError) {
requestsDropped.WithLabelValues(request.Method, string(err)).Inc()
}
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