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63 lines
2.1 KiB
63 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/stretchr/testify/require" |
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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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_, err := os.Stat(fileName) |
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require.Error(t, err, "File %q unexpectedly exists.", fileName) |
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lock, existed, err := Flock(fileName) |
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require.NoError(t, err, "Error locking file %q", fileName) |
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require.False(t, existed, "File %q reported as existing during locking.", fileName) |
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// File must now exist. |
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_, err = os.Stat(fileName) |
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require.NoError(t, err, "Could not stat file %q expected to exist", fileName) |
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// Try to lock again. |
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lockedAgain, existed, err := Flock(fileName) |
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require.Error(t, err, "File %q locked twice.", fileName) |
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require.Nil(t, lockedAgain, "Unsuccessful locking did not return nil.") |
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require.True(t, existed, "Existing file %q not recognized.", fileName) |
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err = lock.Release() |
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require.NoError(t, err, "Error releasing lock for file %q", fileName) |
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// File must still exist. |
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_, err = os.Stat(fileName) |
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require.NoError(t, err, "Could not stat file %q expected to exist", fileName) |
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// Lock existing file. |
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lock, existed, err = Flock(fileName) |
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require.NoError(t, err, "Error locking file %q", fileName) |
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require.True(t, existed, "Existing file %q not recognized.", fileName) |
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err = lock.Release() |
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require.NoError(t, err, "Error releasing lock for file %q", fileName) |
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}
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