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