2017-04-24 22:13:19 +03:00
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// Copyright 2017 The Prometheus Authors
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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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package promhttp
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import (
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2022-08-02 20:33:08 +03:00
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"context"
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2017-06-02 19:55:31 +03:00
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"io"
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2017-04-24 22:13:19 +03:00
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"log"
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"net/http"
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"net/http/httptest"
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"testing"
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"github.com/prometheus/client_golang/prometheus"
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)
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2017-12-23 03:06:17 +03:00
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func TestLabelCheck(t *testing.T) {
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scenarios := map[string]struct {
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metricName string // Defaults to "c".
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varLabels []string
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constLabels []string
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curriedLabels []string
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ok bool
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}{
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"empty": {
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varLabels: []string{},
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constLabels: []string{},
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curriedLabels: []string{},
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ok: true,
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},
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"code as single var label": {
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varLabels: []string{"code"},
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constLabels: []string{},
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curriedLabels: []string{},
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ok: true,
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},
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"method as single var label": {
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varLabels: []string{"method"},
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constLabels: []string{},
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curriedLabels: []string{},
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ok: true,
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},
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"code and method as var labels": {
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varLabels: []string{"method", "code"},
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constLabels: []string{},
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curriedLabels: []string{},
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ok: true,
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},
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"valid case with all labels used": {
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varLabels: []string{"code", "method"},
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constLabels: []string{"foo", "bar"},
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curriedLabels: []string{"dings", "bums"},
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ok: true,
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},
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"all labels used with an invalid const label name": {
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varLabels: []string{"code", "method"},
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constLabels: []string{"in-valid", "bar"},
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curriedLabels: []string{"dings", "bums"},
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ok: false,
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},
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"unsupported var label": {
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varLabels: []string{"foo"},
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constLabels: []string{},
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curriedLabels: []string{},
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ok: false,
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},
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"mixed var labels": {
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varLabels: []string{"method", "foo", "code"},
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constLabels: []string{},
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curriedLabels: []string{},
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ok: false,
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},
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"unsupported var label but curried": {
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varLabels: []string{},
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constLabels: []string{},
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curriedLabels: []string{"foo"},
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ok: true,
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},
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"mixed var labels but unsupported curried": {
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varLabels: []string{"code", "method"},
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constLabels: []string{},
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curriedLabels: []string{"foo"},
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ok: true,
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},
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"supported label as const and curry": {
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varLabels: []string{},
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constLabels: []string{"code"},
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curriedLabels: []string{"method"},
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ok: true,
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},
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"supported label as const and curry with unsupported as var": {
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varLabels: []string{"foo"},
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constLabels: []string{"code"},
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curriedLabels: []string{"method"},
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ok: false,
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},
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"invalid name and otherwise empty": {
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metricName: "in-valid",
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varLabels: []string{},
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constLabels: []string{},
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curriedLabels: []string{},
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ok: false,
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},
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"invalid name with all the otherwise valid labels": {
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metricName: "in-valid",
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varLabels: []string{"code", "method"},
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constLabels: []string{"foo", "bar"},
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curriedLabels: []string{"dings", "bums"},
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ok: false,
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},
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}
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for name, sc := range scenarios {
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t.Run(name, func(t *testing.T) {
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metricName := sc.metricName
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if metricName == "" {
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metricName = "c"
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}
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constLabels := prometheus.Labels{}
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for _, l := range sc.constLabels {
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constLabels[l] = "dummy"
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}
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c := prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Name: metricName,
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Help: "c help",
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ConstLabels: constLabels,
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},
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append(sc.varLabels, sc.curriedLabels...),
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)
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o := prometheus.ObserverVec(prometheus.NewHistogramVec(
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prometheus.HistogramOpts{
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Name: metricName,
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Help: "c help",
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ConstLabels: constLabels,
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},
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append(sc.varLabels, sc.curriedLabels...),
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))
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2022-01-18 22:32:44 +03:00
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//nolint:typecheck // Ignore declared but unused error.
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for _, l := range sc.curriedLabels {
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c = c.MustCurryWith(prometheus.Labels{l: "dummy"})
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o = o.MustCurryWith(prometheus.Labels{l: "dummy"})
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}
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func() {
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defer func() {
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if err := recover(); err != nil {
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if sc.ok {
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t.Error("unexpected panic:", err)
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}
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} else if !sc.ok {
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t.Error("expected panic")
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}
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}()
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InstrumentHandlerCounter(c, nil)
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}()
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func() {
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defer func() {
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if err := recover(); err != nil {
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if sc.ok {
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t.Error("unexpected panic:", err)
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}
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} else if !sc.ok {
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t.Error("expected panic")
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}
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}()
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InstrumentHandlerDuration(o, nil)
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}()
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if sc.ok {
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// Test if wantCode and wantMethod were detected correctly.
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var wantCode, wantMethod bool
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for _, l := range sc.varLabels {
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if l == "code" {
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wantCode = true
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}
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if l == "method" {
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wantMethod = true
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}
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}
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gotCode, gotMethod := checkLabels(c)
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if gotCode != wantCode {
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t.Errorf("wanted code=%t for counter, got code=%t", wantCode, gotCode)
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}
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if gotMethod != wantMethod {
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t.Errorf("wanted method=%t for counter, got method=%t", wantMethod, gotMethod)
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}
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gotCode, gotMethod = checkLabels(o)
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if gotCode != wantCode {
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t.Errorf("wanted code=%t for observer, got code=%t", wantCode, gotCode)
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}
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if gotMethod != wantMethod {
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t.Errorf("wanted method=%t for observer, got method=%t", wantMethod, gotMethod)
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}
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}
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})
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}
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}
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2022-01-18 12:19:28 +03:00
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func TestLabels(t *testing.T) {
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scenarios := map[string]struct {
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varLabels []string
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reqMethod string
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respStatus int
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extraMethods []string
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wantLabels prometheus.Labels
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ok bool
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}{
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"empty": {
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varLabels: []string{},
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wantLabels: emptyLabels,
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reqMethod: "GET",
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respStatus: 200,
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ok: true,
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},
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"code as single var label": {
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varLabels: []string{"code"},
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reqMethod: "GET",
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respStatus: 200,
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wantLabels: prometheus.Labels{"code": "200"},
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ok: true,
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},
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"code as single var label and out-of-range code": {
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varLabels: []string{"code"},
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reqMethod: "GET",
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respStatus: 99,
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wantLabels: prometheus.Labels{"code": "unknown"},
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ok: true,
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},
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"code as single var label and in-range but unrecognized code": {
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varLabels: []string{"code"},
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reqMethod: "GET",
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respStatus: 308,
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wantLabels: prometheus.Labels{"code": "308"},
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ok: true,
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},
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"method as single var label": {
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varLabels: []string{"method"},
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reqMethod: "GET",
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respStatus: 200,
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wantLabels: prometheus.Labels{"method": "get"},
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ok: true,
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},
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"method as single var label and unknown method": {
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varLabels: []string{"method"},
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reqMethod: "CUSTOM_METHOD",
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respStatus: 200,
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wantLabels: prometheus.Labels{"method": "unknown"},
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ok: true,
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},
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"code and method as var labels": {
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varLabels: []string{"method", "code"},
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reqMethod: "GET",
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respStatus: 200,
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wantLabels: prometheus.Labels{"method": "get", "code": "200"},
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ok: true,
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},
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"method as single var label with extra methods specified": {
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varLabels: []string{"method"},
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reqMethod: "CUSTOM_METHOD",
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respStatus: 200,
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extraMethods: []string{"CUSTOM_METHOD", "CUSTOM_METHOD_1"},
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wantLabels: prometheus.Labels{"method": "custom_method"},
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ok: true,
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},
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"all labels used with an unknown method and out-of-range code": {
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varLabels: []string{"code", "method"},
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reqMethod: "CUSTOM_METHOD",
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respStatus: 99,
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wantLabels: prometheus.Labels{"method": "unknown", "code": "unknown"},
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ok: false,
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},
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}
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checkLabels := func(labels []string) (gotCode, gotMethod bool) {
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for _, label := range labels {
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switch label {
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case "code":
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gotCode = true
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case "method":
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gotMethod = true
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default:
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panic("metric partitioned with non-supported labels for this test")
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}
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}
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return
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}
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equalLabels := func(gotLabels, wantLabels prometheus.Labels) bool {
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if len(gotLabels) != len(wantLabels) {
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return false
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}
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for ln, lv := range gotLabels {
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olv, ok := wantLabels[ln]
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if !ok {
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return false
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}
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if olv != lv {
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return false
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}
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}
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return true
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}
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for name, sc := range scenarios {
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t.Run(name, func(t *testing.T) {
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if sc.ok {
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gotCode, gotMethod := checkLabels(sc.varLabels)
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gotLabels := labels(gotCode, gotMethod, sc.reqMethod, sc.respStatus, sc.extraMethods...)
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if !equalLabels(gotLabels, sc.wantLabels) {
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t.Errorf("wanted labels=%v for counter, got code=%v", sc.wantLabels, gotLabels)
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}
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}
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})
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}
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}
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2022-08-02 20:33:08 +03:00
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func makeInstrumentedHandler(handler http.HandlerFunc, opts ...Option) (http.Handler, *prometheus.Registry) {
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2017-05-10 20:49:36 +03:00
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reg := prometheus.NewRegistry()
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2017-04-24 22:13:19 +03:00
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inFlightGauge := prometheus.NewGauge(prometheus.GaugeOpts{
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Name: "in_flight_requests",
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Help: "A gauge of requests currently being served by the wrapped handler.",
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})
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counter := prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Name: "api_requests_total",
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Help: "A counter for requests to the wrapped handler.",
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},
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[]string{"code", "method"},
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)
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histVec := prometheus.NewHistogramVec(
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prometheus.HistogramOpts{
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2017-05-10 20:49:36 +03:00
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Name: "response_duration_seconds",
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Help: "A histogram of request latencies.",
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Buckets: prometheus.DefBuckets,
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ConstLabels: prometheus.Labels{"handler": "api"},
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2017-04-24 22:13:19 +03:00
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},
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[]string{"method"},
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)
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2017-05-29 12:42:43 +03:00
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writeHeaderVec := prometheus.NewHistogramVec(
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prometheus.HistogramOpts{
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Name: "write_header_duration_seconds",
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Help: "A histogram of time to first write latencies.",
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Buckets: prometheus.DefBuckets,
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ConstLabels: prometheus.Labels{"handler": "api"},
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},
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[]string{},
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)
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2017-04-24 22:13:19 +03:00
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responseSize := prometheus.NewHistogramVec(
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prometheus.HistogramOpts{
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Name: "push_request_size_bytes",
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Help: "A histogram of request sizes for requests.",
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Buckets: []float64{200, 500, 900, 1500},
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},
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[]string{},
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)
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2017-05-29 12:42:43 +03:00
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reg.MustRegister(inFlightGauge, counter, histVec, responseSize, writeHeaderVec)
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2017-04-24 22:13:19 +03:00
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|
2022-08-02 20:33:08 +03:00
|
|
|
return InstrumentHandlerInFlight(inFlightGauge,
|
2017-04-24 22:13:19 +03:00
|
|
|
InstrumentHandlerCounter(counter,
|
|
|
|
InstrumentHandlerDuration(histVec,
|
2017-05-29 12:42:43 +03:00
|
|
|
InstrumentHandlerTimeToWriteHeader(writeHeaderVec,
|
2022-08-02 20:33:08 +03:00
|
|
|
InstrumentHandlerResponseSize(responseSize, handler, opts...),
|
|
|
|
opts...),
|
|
|
|
opts...),
|
|
|
|
opts...),
|
|
|
|
), reg
|
|
|
|
}
|
|
|
|
|
|
|
|
func TestMiddlewareAPI(t *testing.T) {
|
|
|
|
chain, reg := makeInstrumentedHandler(func(w http.ResponseWriter, r *http.Request) {
|
|
|
|
_, _ = w.Write([]byte("OK"))
|
|
|
|
})
|
2017-04-24 22:13:19 +03:00
|
|
|
|
|
|
|
r, _ := http.NewRequest("GET", "www.example.com", nil)
|
|
|
|
w := httptest.NewRecorder()
|
|
|
|
chain.ServeHTTP(w, r)
|
2022-08-02 20:33:08 +03:00
|
|
|
|
|
|
|
assetMetricAndExemplars(t, reg, 5, nil)
|
|
|
|
}
|
|
|
|
|
|
|
|
func TestMiddlewareAPI_WithExemplars(t *testing.T) {
|
|
|
|
exemplar := prometheus.Labels{"traceID": "example situation observed by this metric"}
|
|
|
|
|
|
|
|
chain, reg := makeInstrumentedHandler(func(w http.ResponseWriter, r *http.Request) {
|
|
|
|
_, _ = w.Write([]byte("OK"))
|
|
|
|
}, WithExemplarFromContext(func(_ context.Context) prometheus.Labels { return exemplar }))
|
|
|
|
|
|
|
|
r, _ := http.NewRequest("GET", "www.example.com", nil)
|
|
|
|
w := httptest.NewRecorder()
|
|
|
|
chain.ServeHTTP(w, r)
|
|
|
|
|
|
|
|
assetMetricAndExemplars(t, reg, 5, labelsToLabelPair(exemplar))
|
2017-04-24 22:13:19 +03:00
|
|
|
}
|
|
|
|
|
2017-05-29 12:42:43 +03:00
|
|
|
func TestInstrumentTimeToFirstWrite(t *testing.T) {
|
|
|
|
var i int
|
|
|
|
dobs := &responseWriterDelegator{
|
|
|
|
ResponseWriter: httptest.NewRecorder(),
|
|
|
|
observeWriteHeader: func(status int) {
|
|
|
|
i = status
|
|
|
|
},
|
|
|
|
}
|
|
|
|
d := newDelegator(dobs, nil)
|
|
|
|
|
|
|
|
d.WriteHeader(http.StatusOK)
|
|
|
|
|
|
|
|
if i != http.StatusOK {
|
|
|
|
t.Fatalf("failed to execute observeWriteHeader")
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2017-06-02 19:55:31 +03:00
|
|
|
// testResponseWriter is an http.ResponseWriter that also implements
|
|
|
|
// http.CloseNotifier, http.Flusher, and io.ReaderFrom.
|
|
|
|
type testResponseWriter struct {
|
|
|
|
closeNotifyCalled, flushCalled, readFromCalled bool
|
|
|
|
}
|
|
|
|
|
|
|
|
func (t *testResponseWriter) Header() http.Header { return nil }
|
|
|
|
func (t *testResponseWriter) Write([]byte) (int, error) { return 0, nil }
|
|
|
|
func (t *testResponseWriter) WriteHeader(int) {}
|
|
|
|
func (t *testResponseWriter) CloseNotify() <-chan bool {
|
|
|
|
t.closeNotifyCalled = true
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
func (t *testResponseWriter) Flush() { t.flushCalled = true }
|
|
|
|
func (t *testResponseWriter) ReadFrom(io.Reader) (int64, error) {
|
|
|
|
t.readFromCalled = true
|
|
|
|
return 0, nil
|
|
|
|
}
|
|
|
|
|
2018-02-02 17:50:46 +03:00
|
|
|
// testFlusher is an http.ResponseWriter that also implements http.Flusher.
|
|
|
|
type testFlusher struct {
|
|
|
|
flushCalled bool
|
|
|
|
}
|
|
|
|
|
|
|
|
func (t *testFlusher) Header() http.Header { return nil }
|
|
|
|
func (t *testFlusher) Write([]byte) (int, error) { return 0, nil }
|
|
|
|
func (t *testFlusher) WriteHeader(int) {}
|
|
|
|
func (t *testFlusher) Flush() { t.flushCalled = true }
|
|
|
|
|
2017-06-02 19:55:31 +03:00
|
|
|
func TestInterfaceUpgrade(t *testing.T) {
|
|
|
|
w := &testResponseWriter{}
|
|
|
|
d := newDelegator(w, nil)
|
2021-03-16 18:17:19 +03:00
|
|
|
//nolint:staticcheck // Ignore SA1019. http.CloseNotifier is deprecated but we keep it here to not break existing users.
|
2017-06-02 19:55:31 +03:00
|
|
|
d.(http.CloseNotifier).CloseNotify()
|
|
|
|
if !w.closeNotifyCalled {
|
|
|
|
t.Error("CloseNotify not called")
|
|
|
|
}
|
|
|
|
d.(http.Flusher).Flush()
|
|
|
|
if !w.flushCalled {
|
|
|
|
t.Error("Flush not called")
|
|
|
|
}
|
|
|
|
d.(io.ReaderFrom).ReadFrom(nil)
|
|
|
|
if !w.readFromCalled {
|
|
|
|
t.Error("ReadFrom not called")
|
|
|
|
}
|
|
|
|
if _, ok := d.(http.Hijacker); ok {
|
|
|
|
t.Error("delegator unexpectedly implements http.Hijacker")
|
|
|
|
}
|
2018-02-02 17:50:46 +03:00
|
|
|
|
|
|
|
f := &testFlusher{}
|
|
|
|
d = newDelegator(f, nil)
|
2021-03-16 18:17:19 +03:00
|
|
|
//nolint:staticcheck // Ignore SA1019. http.CloseNotifier is deprecated but we keep it here to not break existing users.
|
2018-02-02 17:50:46 +03:00
|
|
|
if _, ok := d.(http.CloseNotifier); ok {
|
|
|
|
t.Error("delegator unexpectedly implements http.CloseNotifier")
|
|
|
|
}
|
|
|
|
d.(http.Flusher).Flush()
|
|
|
|
if !w.flushCalled {
|
|
|
|
t.Error("Flush not called")
|
|
|
|
}
|
|
|
|
if _, ok := d.(io.ReaderFrom); ok {
|
|
|
|
t.Error("delegator unexpectedly implements io.ReaderFrom")
|
|
|
|
}
|
|
|
|
if _, ok := d.(http.Hijacker); ok {
|
|
|
|
t.Error("delegator unexpectedly implements http.Hijacker")
|
|
|
|
}
|
2017-06-02 19:55:31 +03:00
|
|
|
}
|
|
|
|
|
2017-04-24 22:13:19 +03:00
|
|
|
func ExampleInstrumentHandlerDuration() {
|
|
|
|
inFlightGauge := prometheus.NewGauge(prometheus.GaugeOpts{
|
|
|
|
Name: "in_flight_requests",
|
|
|
|
Help: "A gauge of requests currently being served by the wrapped handler.",
|
|
|
|
})
|
|
|
|
|
|
|
|
counter := prometheus.NewCounterVec(
|
|
|
|
prometheus.CounterOpts{
|
|
|
|
Name: "api_requests_total",
|
|
|
|
Help: "A counter for requests to the wrapped handler.",
|
|
|
|
},
|
|
|
|
[]string{"code", "method"},
|
|
|
|
)
|
|
|
|
|
2017-08-30 02:05:29 +03:00
|
|
|
// duration is partitioned by the HTTP method and handler. It uses custom
|
|
|
|
// buckets based on the expected request duration.
|
|
|
|
duration := prometheus.NewHistogramVec(
|
|
|
|
prometheus.HistogramOpts{
|
|
|
|
Name: "request_duration_seconds",
|
|
|
|
Help: "A histogram of latencies for requests.",
|
|
|
|
Buckets: []float64{.25, .5, 1, 2.5, 5, 10},
|
|
|
|
},
|
|
|
|
[]string{"handler", "method"},
|
2017-04-24 22:13:19 +03:00
|
|
|
)
|
|
|
|
|
|
|
|
// responseSize has no labels, making it a zero-dimensional
|
|
|
|
// ObserverVec.
|
|
|
|
responseSize := prometheus.NewHistogramVec(
|
|
|
|
prometheus.HistogramOpts{
|
|
|
|
Name: "response_size_bytes",
|
|
|
|
Help: "A histogram of response sizes for requests.",
|
|
|
|
Buckets: []float64{200, 500, 900, 1500},
|
|
|
|
},
|
|
|
|
[]string{},
|
|
|
|
)
|
|
|
|
|
|
|
|
// Create the handlers that will be wrapped by the middleware.
|
|
|
|
pushHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
|
|
|
w.Write([]byte("Push"))
|
|
|
|
})
|
|
|
|
pullHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
|
|
|
w.Write([]byte("Pull"))
|
|
|
|
})
|
|
|
|
|
|
|
|
// Register all of the metrics in the standard registry.
|
2017-08-30 02:05:29 +03:00
|
|
|
prometheus.MustRegister(inFlightGauge, counter, duration, responseSize)
|
2017-04-24 22:13:19 +03:00
|
|
|
|
2017-08-30 02:05:29 +03:00
|
|
|
// Instrument the handlers with all the metrics, injecting the "handler"
|
|
|
|
// label by currying.
|
2017-04-24 22:13:19 +03:00
|
|
|
pushChain := InstrumentHandlerInFlight(inFlightGauge,
|
2017-08-30 02:05:29 +03:00
|
|
|
InstrumentHandlerDuration(duration.MustCurryWith(prometheus.Labels{"handler": "push"}),
|
|
|
|
InstrumentHandlerCounter(counter,
|
2017-04-24 22:13:19 +03:00
|
|
|
InstrumentHandlerResponseSize(responseSize, pushHandler),
|
|
|
|
),
|
|
|
|
),
|
|
|
|
)
|
|
|
|
pullChain := InstrumentHandlerInFlight(inFlightGauge,
|
2017-08-30 02:05:29 +03:00
|
|
|
InstrumentHandlerDuration(duration.MustCurryWith(prometheus.Labels{"handler": "pull"}),
|
|
|
|
InstrumentHandlerCounter(counter,
|
2017-04-24 22:13:19 +03:00
|
|
|
InstrumentHandlerResponseSize(responseSize, pullHandler),
|
|
|
|
),
|
|
|
|
),
|
|
|
|
)
|
|
|
|
|
|
|
|
http.Handle("/metrics", Handler())
|
|
|
|
http.Handle("/push", pushChain)
|
|
|
|
http.Handle("/pull", pullChain)
|
|
|
|
|
|
|
|
if err := http.ListenAndServe(":3000", nil); err != nil {
|
|
|
|
log.Fatal(err)
|
|
|
|
}
|
|
|
|
}
|