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80 lines
2.1 KiB
80 lines
2.1 KiB
// 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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