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107 lines
3.0 KiB
Go
107 lines
3.0 KiB
Go
// Copyright 2014 The LevelDB-Go and Pebble Authors. All rights reserved. Use
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// of this source code is governed by a BSD-style license that can be found in
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// the LICENSE file.
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package vfs_test
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import (
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"bytes"
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"flag"
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"os"
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"os/exec"
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"testing"
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"github.com/cockroachdb/pebble/vfs"
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"github.com/stretchr/testify/require"
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)
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var lockFilename = flag.String("lockfile", "", "File to lock. A non-empty value implies a child process.")
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func spawn(prog, filename string) ([]byte, error) {
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return exec.Command(prog, "-lockfile", filename, "-test.v",
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"-test.run=TestLock$").CombinedOutput()
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}
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// TestLock locks a file, spawns a second process that attempts to grab the
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// lock to verify it fails.
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// Then it closes the lock, and spawns a third copy to verify it can be
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// relocked.
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func TestLock(t *testing.T) {
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child := *lockFilename != ""
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var filename string
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if child {
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filename = *lockFilename
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} else {
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f, err := os.CreateTemp("", "golang-pebble-db-testlock-")
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require.NoError(t, err)
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filename = f.Name()
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// NB: On Windows, locking will fail if the file is already open by the
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// current process, so we close the lockfile here.
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require.NoError(t, f.Close())
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defer os.Remove(filename)
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}
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// Avoid truncating an existing, non-empty file.
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fi, err := os.Stat(filename)
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if err == nil && fi.Size() != 0 {
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t.Fatalf("The file %s is not empty", filename)
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}
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t.Logf("Locking: %s", filename)
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lock, err := vfs.Default.Lock(filename)
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if err != nil {
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t.Fatalf("Could not lock %s: %v", filename, err)
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}
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if !child {
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t.Logf("Spawning child, should fail to grab lock.")
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out, err := spawn(os.Args[0], filename)
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if err == nil {
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t.Fatalf("Attempt to grab open lock should have failed.\n%s", out)
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}
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if !bytes.Contains(out, []byte("Could not lock")) {
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t.Fatalf("Child failed with unexpected output: %s", out)
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}
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t.Logf("Child failed to grab lock as expected.")
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}
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t.Logf("Unlocking %s", filename)
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if err := lock.Close(); err != nil {
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t.Fatalf("Could not unlock %s: %v", filename, err)
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}
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if !child {
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t.Logf("Spawning child, should successfully grab lock.")
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if out, err := spawn(os.Args[0], filename); err != nil {
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t.Fatalf("Attempt to re-open lock should have succeeded: %v\n%s",
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err, out)
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}
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t.Logf("Child grabbed lock.")
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}
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}
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func TestLockSameProcess(t *testing.T) {
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f, err := os.CreateTemp("", "pebble-testlocksameprocess-")
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require.NoError(t, err)
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filename := f.Name()
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// NB: On Windows, locking will fail if the file is already open by the
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// current process, so we close the lockfile here.
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require.NoError(t, f.Close())
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defer os.Remove(filename)
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lock1, err := vfs.Default.Lock(filename)
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require.NoError(t, err)
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// Locking the file again from within the same process should fail.
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// On Unix, Lock should detect the file in the global map of
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// process-locked files.
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// On Windows, locking will fail since the file is already open by the
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// current process.
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_, err = vfs.Default.Lock(filename)
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require.Error(t, err)
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require.NoError(t, lock1.Close())
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}
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