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// Copyright 2016 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 retrieval
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import (
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"fmt"
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"net/http"
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"net/http/httptest"
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"net/url"
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"reflect"
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"sort"
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"strings"
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"sync"
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"testing"
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"time"
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"github.com/prometheus/common/model"
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"golang.org/x/net/context"
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"github.com/prometheus/prometheus/config"
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"github.com/prometheus/prometheus/storage"
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)
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func TestNewScrapePool(t *testing.T) {
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var (
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app = &nopAppender{}
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cfg = &config.ScrapeConfig{}
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sp = newScrapePool(cfg, app)
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)
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if a, ok := sp.appender.(*nopAppender); !ok || a != app {
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t.Fatalf("Wrong sample appender")
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}
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if sp.config != cfg {
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t.Fatalf("Wrong scrape config")
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}
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if sp.newLoop == nil {
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t.Fatalf("newLoop function not initialized")
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}
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}
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type testLoop struct {
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startFunc func(interval, timeout time.Duration, errc chan<- error)
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stopFunc func()
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}
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func (l *testLoop) run(interval, timeout time.Duration, errc chan<- error) {
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l.startFunc(interval, timeout, errc)
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}
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func (l *testLoop) stop() {
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l.stopFunc()
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}
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func TestScrapePoolStop(t *testing.T) {
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sp := &scrapePool{
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targets: map[uint64]*Target{},
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loops: map[uint64]loop{},
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}
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var mtx sync.Mutex
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stopped := map[uint64]bool{}
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numTargets := 20
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// Stopping the scrape pool must call stop() on all scrape loops,
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// clean them and the respective targets up. It must wait until each loop's
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// stop function returned before returning itself.
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for i := 0; i < numTargets; i++ {
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t := &Target{
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labels: model.LabelSet{
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model.AddressLabel: model.LabelValue(fmt.Sprintf("example.com:%d", i)),
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},
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}
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l := &testLoop{}
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l.stopFunc = func() {
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time.Sleep(time.Duration(i*20) * time.Millisecond)
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mtx.Lock()
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stopped[t.hash()] = true
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mtx.Unlock()
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}
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sp.targets[t.hash()] = t
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sp.loops[t.hash()] = l
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}
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done := make(chan struct{})
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stopTime := time.Now()
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go func() {
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sp.stop()
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close(done)
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}()
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select {
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case <-time.After(5 * time.Second):
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t.Fatalf("scrapeLoop.stop() did not return as expected")
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case <-done:
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// This should have taken at least as long as the last target slept.
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if time.Since(stopTime) < time.Duration(numTargets*20)*time.Millisecond {
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t.Fatalf("scrapeLoop.stop() exited before all targets stopped")
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}
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}
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mtx.Lock()
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if len(stopped) != numTargets {
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t.Fatalf("Expected 20 stopped loops, got %d", len(stopped))
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}
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mtx.Unlock()
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if len(sp.targets) > 0 {
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t.Fatalf("Targets were not cleared on stopping: %d left", len(sp.targets))
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}
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if len(sp.loops) > 0 {
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t.Fatalf("Loops were not cleared on stopping: %d left", len(sp.loops))
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}
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}
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func TestScrapePoolReload(t *testing.T) {
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var mtx sync.Mutex
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numTargets := 20
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stopped := map[uint64]bool{}
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reloadCfg := &config.ScrapeConfig{
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ScrapeInterval: model.Duration(3 * time.Second),
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ScrapeTimeout: model.Duration(2 * time.Second),
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}
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// On starting to run, new loops created on reload check whether their preceding
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// equivalents have been stopped.
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newLoop := func(ctx context.Context, s scraper, app, reportApp storage.SampleAppender) loop {
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l := &testLoop{}
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l.startFunc = func(interval, timeout time.Duration, errc chan<- error) {
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if interval != 3*time.Second {
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t.Errorf("Expected scrape interval %d but got %d", 3*time.Second, interval)
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}
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if timeout != 2*time.Second {
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t.Errorf("Expected scrape timeout %d but got %d", 2*time.Second, timeout)
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}
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mtx.Lock()
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if !stopped[s.(*targetScraper).hash()] {
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t.Errorf("Scrape loop for %v not stopped yet", s.(*targetScraper))
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}
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mtx.Unlock()
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}
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return l
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}
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sp := &scrapePool{
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targets: map[uint64]*Target{},
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loops: map[uint64]loop{},
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newLoop: newLoop,
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}
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// Reloading a scrape pool with a new scrape configuration must stop all scrape
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// loops and start new ones. A new loop must not be started before the preceding
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// one terminated.
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for i := 0; i < numTargets; i++ {
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t := &Target{
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labels: model.LabelSet{
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model.AddressLabel: model.LabelValue(fmt.Sprintf("example.com:%d", i)),
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},
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}
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l := &testLoop{}
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l.stopFunc = func() {
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time.Sleep(time.Duration(i*20) * time.Millisecond)
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mtx.Lock()
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stopped[t.hash()] = true
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mtx.Unlock()
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}
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sp.targets[t.hash()] = t
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sp.loops[t.hash()] = l
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}
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done := make(chan struct{})
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beforeTargets := map[uint64]*Target{}
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for h, t := range sp.targets {
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beforeTargets[h] = t
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}
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reloadTime := time.Now()
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go func() {
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sp.reload(reloadCfg)
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close(done)
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}()
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select {
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case <-time.After(5 * time.Second):
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t.Fatalf("scrapeLoop.reload() did not return as expected")
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case <-done:
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// This should have taken at least as long as the last target slept.
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if time.Since(reloadTime) < time.Duration(numTargets*20)*time.Millisecond {
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t.Fatalf("scrapeLoop.stop() exited before all targets stopped")
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}
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}
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mtx.Lock()
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if len(stopped) != numTargets {
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t.Fatalf("Expected 20 stopped loops, got %d", len(stopped))
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}
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mtx.Unlock()
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if !reflect.DeepEqual(sp.targets, beforeTargets) {
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t.Fatalf("Reloading affected target states unexpectedly")
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}
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if len(sp.loops) != numTargets {
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t.Fatalf("Expected %d loops after reload but got %d", numTargets, len(sp.loops))
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}
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}
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func TestScrapePoolReportAppender(t *testing.T) {
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cfg := &config.ScrapeConfig{
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MetricRelabelConfigs: []*config.RelabelConfig{
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{}, {}, {},
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},
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}
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target := newTestTarget("example.com:80", 10*time.Millisecond, nil)
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app := &nopAppender{}
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sp := newScrapePool(cfg, app)
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cfg.HonorLabels = false
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wrapped := sp.reportAppender(target)
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rl, ok := wrapped.(ruleLabelsAppender)
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if !ok {
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t.Fatalf("Expected ruleLabelsAppender but got %T", wrapped)
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}
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if rl.SampleAppender != app {
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t.Fatalf("Expected base appender but got %T", rl.SampleAppender)
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}
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cfg.HonorLabels = true
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wrapped = sp.reportAppender(target)
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hl, ok := wrapped.(ruleLabelsAppender)
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if !ok {
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t.Fatalf("Expected ruleLabelsAppender but got %T", wrapped)
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}
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if hl.SampleAppender != app {
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t.Fatalf("Expected base appender but got %T", hl.SampleAppender)
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}
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}
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func TestScrapePoolSampleAppender(t *testing.T) {
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cfg := &config.ScrapeConfig{
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MetricRelabelConfigs: []*config.RelabelConfig{
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{}, {}, {},
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},
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}
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target := newTestTarget("example.com:80", 10*time.Millisecond, nil)
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app := &nopAppender{}
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sp := newScrapePool(cfg, app)
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cfg.HonorLabels = false
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wrapped := sp.sampleAppender(target)
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rl, ok := wrapped.(ruleLabelsAppender)
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if !ok {
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t.Fatalf("Expected ruleLabelsAppender but got %T", wrapped)
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}
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re, ok := rl.SampleAppender.(relabelAppender)
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if !ok {
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t.Fatalf("Expected relabelAppender but got %T", rl.SampleAppender)
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}
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if re.SampleAppender != app {
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t.Fatalf("Expected base appender but got %T", re.SampleAppender)
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}
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cfg.HonorLabels = true
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wrapped = sp.sampleAppender(target)
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hl, ok := wrapped.(honorLabelsAppender)
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if !ok {
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t.Fatalf("Expected honorLabelsAppender but got %T", wrapped)
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}
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re, ok = hl.SampleAppender.(relabelAppender)
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if !ok {
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t.Fatalf("Expected relabelAppender but got %T", hl.SampleAppender)
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}
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if re.SampleAppender != app {
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t.Fatalf("Expected base appender but got %T", re.SampleAppender)
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}
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}
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func TestScrapeLoopStop(t *testing.T) {
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scraper := &testScraper{}
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sl := newScrapeLoop(context.Background(), scraper, nil, nil)
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// The scrape pool synchronizes on stopping scrape loops. However, new scrape
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// loops are syarted asynchronously. Thus it's possible, that a loop is stopped
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// again before having started properly.
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// Stopping not-yet-started loops must block until the run method was called and exited.
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// The run method must exit immediately.
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stopDone := make(chan struct{})
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go func() {
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sl.stop()
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close(stopDone)
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}()
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select {
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case <-stopDone:
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t.Fatalf("Stopping terminated before run exited successfully")
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case <-time.After(500 * time.Millisecond):
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}
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// Running the scrape loop must exit before calling the scraper even once.
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scraper.scrapeFunc = func(context.Context, time.Time) (model.Samples, error) {
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t.Fatalf("scraper was called for terminated scrape loop")
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return nil, nil
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}
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runDone := make(chan struct{})
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go func() {
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sl.run(1, 0, nil)
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close(runDone)
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}()
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select {
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case <-runDone:
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case <-time.After(1 * time.Second):
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t.Fatalf("Running terminated scrape loop did not exit")
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}
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select {
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case <-stopDone:
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case <-time.After(1 * time.Second):
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t.Fatalf("Stopping did not terminate after running exited")
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}
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}
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func TestScrapeLoopRun(t *testing.T) {
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var (
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signal = make(chan struct{})
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errc = make(chan error)
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scraper = &testScraper{}
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app = &nopAppender{}
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reportApp = &nopAppender{}
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)
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defer close(signal)
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ctx, cancel := context.WithCancel(context.Background())
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sl := newScrapeLoop(ctx, scraper, app, reportApp)
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// The loop must terminate during the initial offset if the context
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// is canceled.
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scraper.offsetDur = time.Hour
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go func() {
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sl.run(time.Second, time.Hour, errc)
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signal <- struct{}{}
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}()
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// Wait to make sure we are actually waiting on the offset.
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time.Sleep(1 * time.Second)
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cancel()
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select {
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case <-signal:
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case <-time.After(5 * time.Second):
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t.Fatalf("Cancelation during initial offset failed")
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case err := <-errc:
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t.Fatalf("Unexpected error: %s", err)
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}
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// The provided timeout must cause cancelation of the context passed down to the
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// scraper. The scraper has to respect the context.
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scraper.offsetDur = 0
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block := make(chan struct{})
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scraper.scrapeFunc = func(ctx context.Context, ts time.Time) (model.Samples, error) {
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select {
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case <-block:
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case <-ctx.Done():
|
|
|
|
return nil, ctx.Err()
|
|
|
|
}
|
|
|
|
return nil, nil
|
|
|
|
}
|
|
|
|
|
|
|
|
ctx, cancel = context.WithCancel(context.Background())
|
|
|
|
sl = newScrapeLoop(ctx, scraper, app, reportApp)
|
|
|
|
|
|
|
|
go func() {
|
|
|
|
sl.run(time.Second, 100*time.Millisecond, errc)
|
|
|
|
signal <- struct{}{}
|
|
|
|
}()
|
|
|
|
|
|
|
|
select {
|
|
|
|
case err := <-errc:
|
|
|
|
if err != context.DeadlineExceeded {
|
|
|
|
t.Fatalf("Expected timeout error but got: %s", err)
|
|
|
|
}
|
|
|
|
case <-time.After(3 * time.Second):
|
|
|
|
t.Fatalf("Expected timeout error but got none")
|
|
|
|
}
|
|
|
|
|
|
|
|
// We already caught the timeout error and are certainly in the loop.
|
|
|
|
// Let the scrapes returns immediately to cause no further timeout errors
|
|
|
|
// and check whether canceling the parent context terminates the loop.
|
|
|
|
close(block)
|
|
|
|
cancel()
|
|
|
|
|
|
|
|
select {
|
|
|
|
case <-signal:
|
|
|
|
// Loop terminated as expected.
|
|
|
|
case err := <-errc:
|
|
|
|
t.Fatalf("Unexpected error: %s", err)
|
|
|
|
case <-time.After(3 * time.Second):
|
|
|
|
t.Fatalf("Loop did not terminate on context cancelation")
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
func TestTargetScraperScrapeOK(t *testing.T) {
|
|
|
|
server := httptest.NewServer(
|
|
|
|
http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
|
|
|
w.Header().Set("Content-Type", `text/plain; version=0.0.4`)
|
|
|
|
w.Write([]byte("metric_a 1\nmetric_b 2\n"))
|
|
|
|
}),
|
|
|
|
)
|
|
|
|
defer server.Close()
|
|
|
|
|
|
|
|
serverURL, err := url.Parse(server.URL)
|
|
|
|
if err != nil {
|
|
|
|
panic(err)
|
|
|
|
}
|
|
|
|
|
|
|
|
ts := &targetScraper{
|
|
|
|
Target: &Target{
|
|
|
|
labels: model.LabelSet{
|
|
|
|
model.SchemeLabel: model.LabelValue(serverURL.Scheme),
|
|
|
|
model.AddressLabel: model.LabelValue(serverURL.Host),
|
|
|
|
},
|
|
|
|
},
|
|
|
|
client: http.DefaultClient,
|
|
|
|
}
|
|
|
|
now := time.Now()
|
|
|
|
|
|
|
|
samples, err := ts.scrape(context.Background(), now)
|
|
|
|
if err != nil {
|
|
|
|
t.Fatalf("Unexpected scrape error: %s", err)
|
|
|
|
}
|
|
|
|
|
|
|
|
expectedSamples := model.Samples{
|
|
|
|
{
|
|
|
|
Metric: model.Metric{"__name__": "metric_a"},
|
|
|
|
Timestamp: model.TimeFromUnixNano(now.UnixNano()),
|
|
|
|
Value: 1,
|
|
|
|
},
|
|
|
|
{
|
|
|
|
Metric: model.Metric{"__name__": "metric_b"},
|
|
|
|
Timestamp: model.TimeFromUnixNano(now.UnixNano()),
|
|
|
|
Value: 2,
|
|
|
|
},
|
|
|
|
}
|
|
|
|
sort.Sort(expectedSamples)
|
|
|
|
sort.Sort(samples)
|
|
|
|
|
|
|
|
if !reflect.DeepEqual(samples, expectedSamples) {
|
|
|
|
t.Errorf("Scraped samples did not match served metrics")
|
|
|
|
t.Errorf("Expected: %v", expectedSamples)
|
|
|
|
t.Fatalf("Got: %v", samples)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
func TestTargetScrapeScrapeCancel(t *testing.T) {
|
|
|
|
block := make(chan struct{})
|
|
|
|
|
|
|
|
server := httptest.NewServer(
|
|
|
|
http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
|
|
|
<-block
|
|
|
|
}),
|
|
|
|
)
|
|
|
|
defer server.Close()
|
|
|
|
|
|
|
|
serverURL, err := url.Parse(server.URL)
|
|
|
|
if err != nil {
|
|
|
|
panic(err)
|
|
|
|
}
|
|
|
|
|
|
|
|
ts := &targetScraper{
|
|
|
|
Target: &Target{
|
|
|
|
labels: model.LabelSet{
|
|
|
|
model.SchemeLabel: model.LabelValue(serverURL.Scheme),
|
|
|
|
model.AddressLabel: model.LabelValue(serverURL.Host),
|
|
|
|
},
|
|
|
|
},
|
|
|
|
client: http.DefaultClient,
|
|
|
|
}
|
|
|
|
ctx, cancel := context.WithCancel(context.Background())
|
|
|
|
|
|
|
|
done := make(chan struct{})
|
|
|
|
|
|
|
|
go func() {
|
|
|
|
time.Sleep(1 * time.Second)
|
|
|
|
cancel()
|
|
|
|
}()
|
|
|
|
|
|
|
|
go func() {
|
|
|
|
if _, err := ts.scrape(ctx, time.Now()); err != context.Canceled {
|
|
|
|
t.Fatalf("Expected context cancelation error but got: %s", err)
|
|
|
|
}
|
|
|
|
close(done)
|
|
|
|
}()
|
|
|
|
|
|
|
|
select {
|
|
|
|
case <-time.After(5 * time.Second):
|
|
|
|
t.Fatalf("Scrape function did not return unexpectedly")
|
|
|
|
case <-done:
|
|
|
|
}
|
|
|
|
// If this is closed in a defer above the function the test server
|
|
|
|
// does not terminate and the test doens't complete.
|
|
|
|
close(block)
|
|
|
|
}
|
|
|
|
|
|
|
|
func TestTargetScrapeScrapeNotFound(t *testing.T) {
|
|
|
|
server := httptest.NewServer(
|
|
|
|
http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
|
|
|
w.WriteHeader(http.StatusNotFound)
|
|
|
|
}),
|
|
|
|
)
|
|
|
|
defer server.Close()
|
|
|
|
|
|
|
|
serverURL, err := url.Parse(server.URL)
|
|
|
|
if err != nil {
|
|
|
|
panic(err)
|
|
|
|
}
|
|
|
|
|
|
|
|
ts := &targetScraper{
|
|
|
|
Target: &Target{
|
|
|
|
labels: model.LabelSet{
|
|
|
|
model.SchemeLabel: model.LabelValue(serverURL.Scheme),
|
|
|
|
model.AddressLabel: model.LabelValue(serverURL.Host),
|
|
|
|
},
|
|
|
|
},
|
|
|
|
client: http.DefaultClient,
|
|
|
|
}
|
|
|
|
|
|
|
|
if _, err := ts.scrape(context.Background(), time.Now()); !strings.Contains(err.Error(), "404") {
|
|
|
|
t.Fatalf("Expected \"404 NotFound\" error but got: %s", err)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// testScraper implements the scraper interface and allows setting values
|
|
|
|
// returned by its methods. It also allows setting a custom scrape function.
|
|
|
|
type testScraper struct {
|
|
|
|
offsetDur time.Duration
|
|
|
|
|
|
|
|
lastStart time.Time
|
|
|
|
lastDuration time.Duration
|
|
|
|
lastError error
|
|
|
|
|
|
|
|
samples model.Samples
|
|
|
|
scrapeErr error
|
|
|
|
scrapeFunc func(context.Context, time.Time) (model.Samples, error)
|
|
|
|
}
|
|
|
|
|
|
|
|
func (ts *testScraper) offset(interval time.Duration) time.Duration {
|
|
|
|
return ts.offsetDur
|
|
|
|
}
|
|
|
|
|
|
|
|
func (ts *testScraper) report(start time.Time, duration time.Duration, err error) {
|
|
|
|
ts.lastStart = start
|
|
|
|
ts.lastDuration = duration
|
|
|
|
ts.lastError = err
|
|
|
|
}
|
|
|
|
|
|
|
|
func (ts *testScraper) scrape(ctx context.Context, t time.Time) (model.Samples, error) {
|
|
|
|
if ts.scrapeFunc != nil {
|
|
|
|
return ts.scrapeFunc(ctx, t)
|
|
|
|
}
|
|
|
|
return ts.samples, ts.scrapeErr
|
|
|
|
}
|