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b4d7ce1370
This also removes closing of the target group channel everywhere as the contexts cancels across all stages and we don't care about draining all events once that happened.
141 lines
3.4 KiB
Go
141 lines
3.4 KiB
Go
// 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 discovery
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import (
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"fmt"
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"io"
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"os"
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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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)
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func TestFileSD(t *testing.T) {
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defer os.Remove("fixtures/_test.yml")
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defer os.Remove("fixtures/_test.json")
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testFileSD(t, ".yml")
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testFileSD(t, ".json")
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}
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func testFileSD(t *testing.T, ext string) {
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// As interval refreshing is more of a fallback, we only want to test
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// whether file watches work as expected.
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var conf config.FileSDConfig
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conf.Files = []string{"fixtures/_*" + ext}
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conf.RefreshInterval = model.Duration(1 * time.Hour)
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var (
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fsd = NewFileDiscovery(&conf)
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ch = make(chan []*config.TargetGroup)
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ctx, cancel = context.WithCancel(context.Background())
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)
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go fsd.Run(ctx, ch)
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select {
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case <-time.After(25 * time.Millisecond):
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// Expected.
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case tgs := <-ch:
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t.Fatalf("Unexpected target groups in file discovery: %s", tgs)
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}
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newf, err := os.Create("fixtures/_test" + ext)
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if err != nil {
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t.Fatal(err)
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}
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defer newf.Close()
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f, err := os.Open("fixtures/target_groups" + ext)
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if err != nil {
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t.Fatal(err)
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}
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defer f.Close()
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_, err = io.Copy(newf, f)
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if err != nil {
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t.Fatal(err)
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}
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newf.Close()
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timeout := time.After(15 * time.Second)
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// The files contain two target groups.
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retry:
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for {
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select {
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case <-timeout:
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t.Fatalf("Expected new target group but got none")
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case tgs := <-ch:
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if len(tgs) != 2 {
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continue retry // Potentially a partial write, just retry.
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}
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tg := tgs[0]
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if _, ok := tg.Labels["foo"]; !ok {
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t.Fatalf("Label not parsed")
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}
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if tg.String() != fmt.Sprintf("fixtures/_test%s:0", ext) {
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t.Fatalf("Unexpected target group %s", tg)
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}
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tg = tgs[1]
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if tg.String() != fmt.Sprintf("fixtures/_test%s:1", ext) {
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t.Fatalf("Unexpected target groups %s", tg)
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}
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break retry
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}
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}
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// Based on unknown circumstances, sometimes fsnotify will trigger more events in
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// some runs (which might be empty, chains of different operations etc.).
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// We have to drain those (as the target manager would) to avoid deadlocking and must
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// not try to make sense of it all...
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drained := make(chan struct{})
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go func() {
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Loop:
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for {
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select {
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case tgs := <-ch:
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// Below we will change the file to a bad syntax. Previously extracted target
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// groups must not be deleted via sending an empty target group.
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if len(tgs[0].Targets) == 0 {
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t.Errorf("Unexpected empty target groups received: %s", tgs)
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}
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case <-time.After(500 * time.Millisecond):
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break Loop
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}
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}
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close(drained)
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}()
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newf, err = os.Create("fixtures/_test.new")
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if err != nil {
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t.Fatal(err)
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}
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defer os.Remove(newf.Name())
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if _, err := newf.Write([]byte("]gibberish\n][")); err != nil {
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t.Fatal(err)
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}
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newf.Close()
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os.Rename(newf.Name(), "fixtures/_test"+ext)
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cancel()
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<-drained
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}
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