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PhutilFileLockTestCase.php
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Fri, Feb 14, 14:34

PhutilFileLockTestCase.php
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<?php
/*
* Copyright 2012 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @group testcase
*/
final class PhutilFileLockTestCase extends PhutilTestCase {
public function testLockTesting() {
// We should be able to acquire locks.
$file = new TempFile();
$this->assertEqual(
true,
$this->lockTest($file));
$this->assertEqual(
true,
$this->lockTest($file));
}
public function testLockHolding() {
// When a process is holding a lock, other processes should be unable
// to acquire it.
$file = new TempFile();
$hold = $this->holdLock($file);
$this->assertEqual(
false,
$this->lockTest($file));
$hold->resolveKill();
$this->assertEqual(
true,
$this->lockTest($file));
}
public function testInProcessLocking() {
// Other processes should be unable to lock a file if we hold the lock.
$file = new TempFile();
$lock = PhutilFileLock::newForPath($file);
$lock->lock();
$this->assertEqual(
false,
$this->lockTest($file));
$lock->unlock();
$this->assertEqual(
true,
$this->lockTest($file));
}
public function testInProcessHolding() {
// We should be unable to lock a file if another process is holding the
// lock.
$file = new TempFile();
$lock = PhutilFileLock::newForPath($file);
$hold = $this->holdLock($file);
$caught = null;
try {
$lock->lock();
} catch (PhutilLockException $ex) {
$caught = $ex;
}
$this->assertEqual(
true,
($caught instanceof PhutilLockException));
$hold->resolveKill();
$this->assertEqual(
true,
$this->lockTest($file));
$lock->lock();
$lock->unlock();
}
public function testRelock() {
// Trying to lock a file twice should throw an exception.
$file = new TempFile();
$lock = PhutilFileLock::newForPath($file);
$lock->lock();
$caught = null;
try {
$lock->lock();
} catch (Exception $ex) {
$caught = $ex;
}
$this->assertEqual(
true,
($caught instanceof Exception));
}
public function testExcessiveUnlock() {
// Trying to unlock a file twice should throw an exception.
$file = new TempFile();
$lock = PhutilFileLock::newForPath($file);
$lock->lock();
$lock->unlock();
$caught = null;
try {
$lock->unlock();
} catch (Exception $ex) {
$caught = $ex;
}
$this->assertEqual(
true,
($caught instanceof Exception));
}
public function testUnlockAll() {
// unlockAll() should release all locks.
$file = new TempFile();
$lock = PhutilFileLock::newForPath($file);
$lock->lock();
$this->assertEqual(false, $this->lockTest($file));
PhutilFileLock::unlockAll();
$this->assertEqual(true, $this->lockTest($file));
// Calling this again shouldn't do anything bad.
PhutilFileLock::unlockAll();
$this->assertEqual(true, $this->lockTest($file));
$lock->lock();
$lock->unlock();
}
public function testIsLocked() {
// isLocked() should report lock status accurately.
$file = new TempFile();
$lock = PhutilFileLock::newForPath($file);
$this->assertEqual(false, $lock->isLocked());
$lock->lock();
$this->assertEqual(true, $lock->isLocked());
$lock->unlock();
$this->assertEqual(false, $lock->isLocked());
}
private function lockTest($file) {
list($err) = $this->buildLockFuture('--test', $file)->resolve();
return ($err == 0);
}
private function holdLock($file) {
$future = $this->buildLockFuture('--hold', $file);
// We can't return until we're sure the subprocess has had time to acquire
// the lock. Since actually testing for the lock would be kind of silly
// and guarantee that we loop forever if the locking primitive broke,
// watch stdout for a *claim* that it has acquired the lock instead.
// Make sure we don't loop forever, no matter how bad things get.
$future->setTimeout(30);
$buf = '';
while (!$future->isReady()) {
list($stdout) = $future->read();
$buf .= $stdout;
if (strpos($buf, 'LOCK ACQUIRED') !== false) {
return $future;
}
}
throw new Exception("Unable to hold lock in external process!");
}
private function buildLockFuture($flags, $file) {
$root = dirname(phutil_get_library_root('phutil'));
$bin = $root.'/scripts/utils/lock.php';
$future = new ExecFuture('%s %C %s', $bin, $flags, $file);
$future->start();
return $future;
}
}

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