mirror of https://github.com/prometheus/prometheus
141 lines
3.4 KiB
Go
141 lines
3.4 KiB
Go
// Copyright 2016 The Prometheus Authors
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package file
|
|
|
|
import (
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"testing"
|
|
"time"
|
|
|
|
"github.com/prometheus/common/model"
|
|
"golang.org/x/net/context"
|
|
|
|
"github.com/prometheus/prometheus/config"
|
|
)
|
|
|
|
func TestFileSD(t *testing.T) {
|
|
defer os.Remove("fixtures/_test.yml")
|
|
defer os.Remove("fixtures/_test.json")
|
|
testFileSD(t, ".yml")
|
|
testFileSD(t, ".json")
|
|
}
|
|
|
|
func testFileSD(t *testing.T, ext string) {
|
|
// As interval refreshing is more of a fallback, we only want to test
|
|
// whether file watches work as expected.
|
|
var conf config.FileSDConfig
|
|
conf.Files = []string{"fixtures/_*" + ext}
|
|
conf.RefreshInterval = model.Duration(1 * time.Hour)
|
|
|
|
var (
|
|
fsd = NewDiscovery(&conf)
|
|
ch = make(chan []*config.TargetGroup)
|
|
ctx, cancel = context.WithCancel(context.Background())
|
|
)
|
|
go fsd.Run(ctx, ch)
|
|
|
|
select {
|
|
case <-time.After(25 * time.Millisecond):
|
|
// Expected.
|
|
case tgs := <-ch:
|
|
t.Fatalf("Unexpected target groups in file discovery: %s", tgs)
|
|
}
|
|
|
|
newf, err := os.Create("fixtures/_test" + ext)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
defer newf.Close()
|
|
|
|
f, err := os.Open("fixtures/target_groups" + ext)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
defer f.Close()
|
|
|
|
_, err = io.Copy(newf, f)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
newf.Close()
|
|
|
|
timeout := time.After(15 * time.Second)
|
|
// The files contain two target groups.
|
|
retry:
|
|
for {
|
|
select {
|
|
case <-timeout:
|
|
t.Fatalf("Expected new target group but got none")
|
|
case tgs := <-ch:
|
|
if len(tgs) != 2 {
|
|
continue retry // Potentially a partial write, just retry.
|
|
}
|
|
tg := tgs[0]
|
|
|
|
if _, ok := tg.Labels["foo"]; !ok {
|
|
t.Fatalf("Label not parsed")
|
|
}
|
|
if tg.String() != fmt.Sprintf("fixtures/_test%s:0", ext) {
|
|
t.Fatalf("Unexpected target group %s", tg)
|
|
}
|
|
|
|
tg = tgs[1]
|
|
if tg.String() != fmt.Sprintf("fixtures/_test%s:1", ext) {
|
|
t.Fatalf("Unexpected target groups %s", tg)
|
|
}
|
|
break retry
|
|
}
|
|
}
|
|
|
|
// Based on unknown circumstances, sometimes fsnotify will trigger more events in
|
|
// some runs (which might be empty, chains of different operations etc.).
|
|
// We have to drain those (as the target manager would) to avoid deadlocking and must
|
|
// not try to make sense of it all...
|
|
drained := make(chan struct{})
|
|
go func() {
|
|
Loop:
|
|
for {
|
|
select {
|
|
case tgs := <-ch:
|
|
// Below we will change the file to a bad syntax. Previously extracted target
|
|
// groups must not be deleted via sending an empty target group.
|
|
if len(tgs[0].Targets) == 0 {
|
|
t.Errorf("Unexpected empty target groups received: %s", tgs)
|
|
}
|
|
case <-time.After(500 * time.Millisecond):
|
|
break Loop
|
|
}
|
|
}
|
|
close(drained)
|
|
}()
|
|
|
|
newf, err = os.Create("fixtures/_test.new")
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
defer os.Remove(newf.Name())
|
|
|
|
if _, err := newf.Write([]byte("]gibberish\n][")); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
newf.Close()
|
|
|
|
os.Rename(newf.Name(), "fixtures/_test"+ext)
|
|
|
|
cancel()
|
|
<-drained
|
|
}
|