2016-05-13 06:51:48 +03:00
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// Copyright 2015 The etcd Authors
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2015-06-17 16:32:13 +03:00
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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2016-04-14 07:09:08 +03:00
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package httpproxy
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2015-06-17 16:32:13 +03:00
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import (
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"net/http"
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"strconv"
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"time"
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2015-09-15 23:54:11 +03:00
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2016-03-23 03:10:28 +03:00
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"github.com/prometheus/client_golang/prometheus"
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2015-06-17 16:32:13 +03:00
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)
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var (
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requestsIncoming = prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Namespace: "etcd",
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Subsystem: "proxy",
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Name: "requests_total",
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Help: "Counter requests incoming by method.",
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}, []string{"method"})
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requestsHandled = prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Namespace: "etcd",
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Subsystem: "proxy",
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Name: "handled_total",
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Help: "Counter of requests fully handled (by authoratitave servers)",
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}, []string{"method", "code"})
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requestsDropped = prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Namespace: "etcd",
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Subsystem: "proxy",
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Name: "dropped_total",
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Help: "Counter of requests dropped on the proxy.",
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}, []string{"method", "proxying_error"})
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2018-05-23 23:48:51 +03:00
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requestsHandlingSec = prometheus.NewHistogramVec(
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2015-06-17 16:32:13 +03:00
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prometheus.HistogramOpts{
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Namespace: "etcd",
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Subsystem: "proxy",
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Name: "handling_duration_seconds",
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2018-05-23 23:48:51 +03:00
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Help: "Bucketed histogram of handling time of successful events (non-watches), by method (GET/PUT etc.).",
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// lowest bucket start of upper bound 0.0005 sec (0.5 ms) with factor 2
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// highest bucket start of 0.0005 sec * 2^12 == 2.048 sec
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2015-06-17 16:32:13 +03:00
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Buckets: prometheus.ExponentialBuckets(0.0005, 2, 13),
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}, []string{"method"})
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)
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type forwardingError string
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const (
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zeroEndpoints forwardingError = "zero_endpoints"
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failedSendingRequest forwardingError = "failed_sending_request"
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failedGettingResponse forwardingError = "failed_getting_response"
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)
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func init() {
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prometheus.MustRegister(requestsIncoming)
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prometheus.MustRegister(requestsHandled)
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prometheus.MustRegister(requestsDropped)
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2018-05-23 23:48:51 +03:00
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prometheus.MustRegister(requestsHandlingSec)
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2015-06-17 16:32:13 +03:00
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}
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func reportIncomingRequest(request *http.Request) {
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requestsIncoming.WithLabelValues(request.Method).Inc()
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}
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func reportRequestHandled(request *http.Request, response *http.Response, startTime time.Time) {
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method := request.Method
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requestsHandled.WithLabelValues(method, strconv.Itoa(response.StatusCode)).Inc()
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2018-05-23 23:48:51 +03:00
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requestsHandlingSec.WithLabelValues(method).Observe(time.Since(startTime).Seconds())
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2015-06-17 16:32:13 +03:00
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}
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func reportRequestDropped(request *http.Request, err forwardingError) {
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requestsDropped.WithLabelValues(request.Method, string(err)).Inc()
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}
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