mirror of
https://github.com/gravitational/teleport.git
synced 2026-11-03 07:40:28 +08:00
Anton Miniailo
7695f23cb4
* Refactor our `utils/fs` locking to use `flock` library and add support for windows. Flock works differently on linx/mac vs windows. On windows it's impossible to read/write file after locking, so we need to create separate lockfile.
93 lines
2.5 KiB
Go
93 lines
2.5 KiB
Go
/*
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Copyright 2022 Gravitational, Inc.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package utils
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import (
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"context"
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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 TestLocks(t *testing.T) {
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t.Parallel()
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tmpFile, err := os.CreateTemp("", "teleport-lock-test")
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fp := tmpFile.Name()
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t.Cleanup(func() {
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_ = os.Remove(fp)
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})
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require.NoError(t, err)
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// Can take read lock
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unlock, err := FSTryReadLock(fp)
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require.NoError(t, err)
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require.NoError(t, unlock())
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// Can take write lock
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unlock, err = FSTryWriteLock(fp)
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require.NoError(t, err)
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// Can't take read lock while write lock is held.
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unlock2, err := FSTryReadLock(fp)
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require.ErrorIs(t, err, ErrUnsuccessfulLockTry)
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require.Nil(t, unlock2)
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// Can't take write lock while another write lock is held.
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unlock2, err = FSTryWriteLock(fp)
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require.ErrorIs(t, err, ErrUnsuccessfulLockTry)
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require.Nil(t, unlock2)
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require.NoError(t, unlock())
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unlock, err = FSTryReadLock(fp)
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require.NoError(t, err)
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// Can take second read lock on the same file.
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unlock2, err = FSTryReadLock(fp)
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require.NoError(t, err)
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require.NoError(t, unlock())
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require.NoError(t, unlock2())
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// Can take read lock with timeout
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unlock, err = FSTryReadLockTimeout(context.Background(), fp, time.Second)
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require.NoError(t, err)
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require.NoError(t, unlock())
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// Can take write lock with timeout
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unlock, err = FSTryWriteLockTimeout(context.Background(), fp, time.Second)
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require.NoError(t, err)
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// Fails because timeout is exceeded, since file is already locked.
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unlock2, err = FSTryWriteLockTimeout(context.Background(), fp, time.Millisecond)
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require.ErrorIs(t, err, context.DeadlineExceeded)
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require.Nil(t, unlock2)
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// Fails because context is expired while waiting for timeout.
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ctx, cancel := context.WithDeadline(context.Background(), time.Now())
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defer cancel()
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unlock2, err = FSTryWriteLockTimeout(ctx, fp, time.Hour*1000)
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require.ErrorIs(t, err, context.DeadlineExceeded)
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require.Nil(t, unlock2)
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require.NoError(t, unlock())
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}
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