mirror of
https://github.com/prometheus/prometheus.git
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be11cb2b07
The one central sample ingestion channel has caused a variety of trouble. This commit removes it. Targets and rule evaluation call an Append method directly now. To incorporate multiple storage backends (like OpenTSDB), storage.Tee forks the Append into two different appenders. Note that the tsdb queue manager had its own queue anyway. It was a queue after a queue... Much queue, so overhead... Targets have their own little buffer (implemented as a channel) to avoid stalling during an http scrape. But a new scrape will only be started once the old one is fully ingested. The contraption of three pipelined ingesters was removed. A Target is an ingester itself now. Despite more logic in Target, things should be less confusing now. Also, remove lint and vet warnings in ast.go.
254 lines
6.6 KiB
Go
254 lines
6.6 KiB
Go
// Copyright 2013 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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"errors"
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"fmt"
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"net/http"
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"net/http/httptest"
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"testing"
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"time"
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clientmodel "github.com/prometheus/client_golang/model"
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"github.com/prometheus/prometheus/utility"
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)
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func TestTargetHidesURLAuth(t *testing.T) {
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testVectors := []string{"http://secret:data@host.com/query?args#fragment", "https://example.net/foo", "http://foo.com:31337/bar"}
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testResults := []string{"host.com:80", "example.net:443", "foo.com:31337"}
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if len(testVectors) != len(testResults) {
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t.Errorf("Test vector length does not match test result length.")
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}
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for i := 0; i < len(testVectors); i++ {
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testTarget := target{
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state: Unknown,
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url: testVectors[i],
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httpClient: utility.NewDeadlineClient(0),
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}
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u := testTarget.InstanceIdentifier()
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if u != testResults[i] {
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t.Errorf("Expected InstanceIdentifier to be %v, actual %v", testResults[i], u)
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}
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}
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}
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func TestTargetScrapeUpdatesState(t *testing.T) {
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testTarget := target{
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state: Unknown,
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url: "bad schema",
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httpClient: utility.NewDeadlineClient(0),
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}
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testTarget.scrape(nopAppender{})
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if testTarget.state != Unhealthy {
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t.Errorf("Expected target state %v, actual: %v", Unhealthy, testTarget.state)
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}
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}
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func TestTargetScrapeWithFullChannel(t *testing.T) {
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server := httptest.NewServer(
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http.HandlerFunc(
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func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", `text/plain; version=0.0.4`)
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for i := 0; i < 2*ingestedSamplesCap; i++ {
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w.Write([]byte(
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fmt.Sprintf("test_metric_%d{foo=\"bar\"} 123.456\n", i),
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))
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}
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},
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),
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)
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defer server.Close()
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testTarget := NewTarget(
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server.URL,
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10*time.Millisecond,
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clientmodel.LabelSet{"dings": "bums"},
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).(*target)
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testTarget.scrape(slowAppender{})
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if testTarget.state != Unhealthy {
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t.Errorf("Expected target state %v, actual: %v", Unhealthy, testTarget.state)
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}
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if testTarget.lastError != errIngestChannelFull {
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t.Errorf("Expected target error %q, actual: %q", errIngestChannelFull, testTarget.lastError)
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}
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}
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func TestTargetRecordScrapeHealth(t *testing.T) {
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testTarget := NewTarget(
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"http://example.url", 0, clientmodel.LabelSet{clientmodel.JobLabel: "testjob"},
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).(*target)
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now := clientmodel.Now()
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appender := &collectResultAppender{}
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testTarget.recordScrapeHealth(appender, now, true, 2*time.Second)
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result := appender.result
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if len(result) != 2 {
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t.Fatalf("Expected two samples, got %d", len(result))
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}
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actual := result[0]
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expected := &clientmodel.Sample{
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Metric: clientmodel.Metric{
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clientmodel.MetricNameLabel: scrapeHealthMetricName,
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InstanceLabel: "example.url:80",
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clientmodel.JobLabel: "testjob",
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},
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Timestamp: now,
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Value: 1,
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}
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if !actual.Equal(expected) {
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t.Fatalf("Expected and actual samples not equal. Expected: %v, actual: %v", expected, actual)
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}
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actual = result[1]
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expected = &clientmodel.Sample{
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Metric: clientmodel.Metric{
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clientmodel.MetricNameLabel: scrapeDurationMetricName,
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InstanceLabel: "example.url:80",
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clientmodel.JobLabel: "testjob",
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},
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Timestamp: now,
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Value: 2.0,
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}
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if !actual.Equal(expected) {
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t.Fatalf("Expected and actual samples not equal. Expected: %v, actual: %v", expected, actual)
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}
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}
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func TestTargetScrapeTimeout(t *testing.T) {
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signal := make(chan bool, 1)
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server := httptest.NewServer(
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http.HandlerFunc(
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func(w http.ResponseWriter, r *http.Request) {
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<-signal
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w.Header().Set("Content-Type", `text/plain; version=0.0.4`)
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w.Write([]byte{})
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},
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),
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)
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defer server.Close()
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testTarget := NewTarget(server.URL, 10*time.Millisecond, clientmodel.LabelSet{})
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appender := nopAppender{}
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// scrape once without timeout
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signal <- true
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if err := testTarget.(*target).scrape(appender); err != nil {
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t.Fatal(err)
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}
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// let the deadline lapse
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time.Sleep(15 * time.Millisecond)
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// now scrape again
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signal <- true
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if err := testTarget.(*target).scrape(appender); err != nil {
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t.Fatal(err)
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}
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// now timeout
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if err := testTarget.(*target).scrape(appender); err == nil {
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t.Fatal("expected scrape to timeout")
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} else {
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signal <- true // let handler continue
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}
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// now scrape again without timeout
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signal <- true
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if err := testTarget.(*target).scrape(appender); err != nil {
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t.Fatal(err)
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}
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}
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func TestTargetScrape404(t *testing.T) {
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server := httptest.NewServer(
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http.HandlerFunc(
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func(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(http.StatusNotFound)
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},
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),
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)
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defer server.Close()
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testTarget := NewTarget(server.URL, 10*time.Millisecond, clientmodel.LabelSet{})
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appender := nopAppender{}
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want := errors.New("server returned HTTP status 404 Not Found")
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got := testTarget.(*target).scrape(appender)
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if got == nil || want.Error() != got.Error() {
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t.Fatalf("want err %q, got %q", want, got)
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}
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}
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func TestTargetRunScraperScrapes(t *testing.T) {
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testTarget := target{
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state: Unknown,
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url: "bad schema",
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httpClient: utility.NewDeadlineClient(0),
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scraperStopping: make(chan struct{}),
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scraperStopped: make(chan struct{}),
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}
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go testTarget.RunScraper(nopAppender{}, time.Duration(time.Millisecond))
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// Enough time for a scrape to happen.
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time.Sleep(2 * time.Millisecond)
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if testTarget.lastScrape.IsZero() {
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t.Errorf("Scrape hasn't occured.")
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}
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testTarget.StopScraper()
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// Wait for it to take effect.
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time.Sleep(2 * time.Millisecond)
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last := testTarget.lastScrape
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// Enough time for a scrape to happen.
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time.Sleep(2 * time.Millisecond)
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if testTarget.lastScrape != last {
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t.Errorf("Scrape occured after it was stopped.")
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}
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}
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func BenchmarkScrape(b *testing.B) {
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server := httptest.NewServer(
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http.HandlerFunc(
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func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", `text/plain; version=0.0.4`)
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w.Write([]byte("test_metric{foo=\"bar\"} 123.456\n"))
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},
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),
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)
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defer server.Close()
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testTarget := NewTarget(
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server.URL,
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100*time.Millisecond,
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clientmodel.LabelSet{"dings": "bums"},
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)
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appender := nopAppender{}
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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if err := testTarget.(*target).scrape(appender); err != nil {
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b.Fatal(err)
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}
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}
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}
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