mirror of
https://github.com/prometheus/prometheus.git
synced 2024-12-25 05:34:05 -08:00
81 lines
2.1 KiB
Go
81 lines
2.1 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 fileutil
|
|
|
|
import (
|
|
"os"
|
|
"path/filepath"
|
|
"testing"
|
|
|
|
"github.com/prometheus/prometheus/util/testutil"
|
|
)
|
|
|
|
func TestLocking(t *testing.T) {
|
|
dir := testutil.NewTemporaryDirectory("test_flock", t)
|
|
defer dir.Close()
|
|
|
|
fileName := filepath.Join(dir.Path(), "LOCK")
|
|
|
|
if _, err := os.Stat(fileName); err == nil {
|
|
t.Fatalf("File %q unexpectedly exists.", fileName)
|
|
}
|
|
|
|
lock, existed, err := Flock(fileName)
|
|
if err != nil {
|
|
t.Fatalf("Error locking file %q: %s", fileName, err)
|
|
}
|
|
if existed {
|
|
t.Errorf("File %q reported as existing during locking.", fileName)
|
|
}
|
|
|
|
// File must now exist.
|
|
if _, err = os.Stat(fileName); err != nil {
|
|
t.Errorf("Could not stat file %q expected to exist: %s", fileName, err)
|
|
}
|
|
|
|
// Try to lock again.
|
|
lockedAgain, existed, err := Flock(fileName)
|
|
if err == nil {
|
|
t.Fatalf("File %q locked twice.", fileName)
|
|
}
|
|
if lockedAgain != nil {
|
|
t.Error("Unsuccessful locking did not return nil.")
|
|
}
|
|
if !existed {
|
|
t.Errorf("Existing file %q not recognized.", fileName)
|
|
}
|
|
|
|
if err := lock.Release(); err != nil {
|
|
t.Errorf("Error releasing lock for file %q: %s", fileName, err)
|
|
}
|
|
|
|
// File must still exist.
|
|
if _, err = os.Stat(fileName); err != nil {
|
|
t.Errorf("Could not stat file %q expected to exist: %s", fileName, err)
|
|
}
|
|
|
|
// Lock existing file.
|
|
lock, existed, err = Flock(fileName)
|
|
if err != nil {
|
|
t.Fatalf("Error locking file %q: %s", fileName, err)
|
|
}
|
|
if !existed {
|
|
t.Errorf("Existing file %q not recognized.", fileName)
|
|
}
|
|
|
|
if err := lock.Release(); err != nil {
|
|
t.Errorf("Error releasing lock for file %q: %s", fileName, err)
|
|
}
|
|
}
|