79 lines
1.9 KiB
Go
79 lines
1.9 KiB
Go
// Copyright 2015 The etcd Authors
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//
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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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"testing"
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"time"
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"github.com/stretchr/testify/require"
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)
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func TestLockAndUnlock(t *testing.T) {
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f, err := os.CreateTemp(t.TempDir(), "lock")
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require.NoError(t, err)
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f.Close()
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defer func() {
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require.NoError(t, os.Remove(f.Name()))
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}()
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// lock the file
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l, err := LockFile(f.Name(), os.O_WRONLY, PrivateFileMode)
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require.NoError(t, err)
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// try lock a locked file
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_, err = TryLockFile(f.Name(), os.O_WRONLY, PrivateFileMode)
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require.ErrorIs(t, err, ErrLocked)
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// unlock the file
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require.NoError(t, l.Close())
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// try lock the unlocked file
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dupl, err := TryLockFile(f.Name(), os.O_WRONLY, PrivateFileMode)
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if err != nil {
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t.Errorf("err = %v, want %v", err, nil)
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}
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// blocking on locked file
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locked := make(chan struct{}, 1)
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go func() {
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bl, blerr := LockFile(f.Name(), os.O_WRONLY, PrivateFileMode)
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if blerr != nil {
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t.Error(blerr)
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}
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locked <- struct{}{}
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if blerr = bl.Close(); blerr != nil {
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t.Error(blerr)
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}
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}()
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select {
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case <-locked:
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t.Error("unexpected unblocking")
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case <-time.After(100 * time.Millisecond):
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}
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// unlock
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require.NoError(t, dupl.Close())
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// the previously blocked routine should be unblocked
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select {
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case <-locked:
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case <-time.After(1 * time.Second):
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t.Error("unexpected blocking")
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}
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}
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