public function run()
{
if ($this->shouldRunSilently()) {
echo "Running daemon '{$this->daemon}' silently. Use '--trace' or " . "'--verbose' to produce debugging output.\n";
}
$root = phutil_get_library_root('phutil');
$root = dirname($root);
$exec_dir = $root . '/scripts/daemon/exec/';
// NOTE: PHP implements proc_open() by running 'sh -c'. On most systems this
// is bash, but on Ubuntu it's dash. When you proc_open() using bash, you
// get one new process (the command you ran). When you proc_open() using
// dash, you get two new processes: the command you ran and a parent
// "dash -c" (or "sh -c") process. This means that the child process's PID
// is actually the 'dash' PID, not the command's PID. To avoid this, use
// 'exec' to replace the shell process with the real process; without this,
// the child will call posix_getppid(), be given the pid of the 'sh -c'
// process, and send it SIGUSR1 to keepalive which will terminate it
// immediately. We also won't be able to do process group management because
// the shell process won't properly posix_setsid() so the pgid of the child
// won't be meaningful.
// Format the exec command, which looks something like:
//
// exec ./exec_daemon DaemonName --trace -- --no-discovery
$argv = array();
$argv[] = csprintf('exec ./exec_daemon.php %s', $this->daemon);
foreach ($this->argv as $k => $arg) {
$argv[] = csprintf('%s', $arg);
}
$argv[] = '--';
foreach ($this->moreArgs as $k => $arg) {
$argv[] = csprintf('%s', $arg);
}
$command = implode(' ', $argv);
while (true) {
$this->logMessage('INIT', 'Starting process.');
$future = new ExecFuture('%C', $command);
$future->setCWD($exec_dir);
$future->setStdoutSizeLimit($this->captureBufferSize);
$future->setStderrSizeLimit($this->captureBufferSize);
$this->deadline = time() + $this->deadlineTimeout;
$this->heartbeat = time() + self::HEARTBEAT_WAIT;
$future->isReady();
$this->childPID = $future->getPID();
do {
do {
if ($this->traceMemory) {
$memuse = number_format(memory_get_usage() / 1024, 1);
$this->logMessage('RAMS', 'Overseer Memory Usage: ' . $memuse . ' KB');
}
// We need a shortish timeout here so we can run the tick handler
// frequently in order to process signals.
$result = $future->resolve(1);
list($stdout, $stderr) = $future->read();
$stdout = trim($stdout);
$stderr = trim($stderr);
if (strlen($stdout)) {
$this->logMessage('STDO', $stdout);
}
if (strlen($stderr)) {
$this->logMessage('STDE', $stderr);
}
$future->discardBuffers();
if ($result !== null) {
list($err) = $result;
if ($err) {
$this->logMessage('FAIL', 'Process exited with error ' . $err . '.', $err);
} else {
$this->logMessage('DONE', 'Process exited successfully.');
}
break 2;
}
if ($this->heartbeat < time()) {
$this->heartbeat = time() + self::HEARTBEAT_WAIT;
$this->dispatchEvent(self::EVENT_DID_HEARTBEAT);
}
} while (time() < $this->deadline);
$this->logMessage('HANG', 'Hang detected. Restarting process.');
$this->annihilateProcessGroup();
} while (false);
if ($this->inGracefulShutdown) {
// If we just exited because of a graceful shutdown, break now.
break;
}
$this->logMessage('WAIT', 'Waiting to restart process.');
sleep(self::RESTART_WAIT);
if ($this->inGracefulShutdown) {
// If we were awakend by a graceful shutdown, break now.
break;
}
}
// This is a clean exit after a graceful shutdown.
$this->dispatchEvent(self::EVENT_WILL_EXIT);
exit(0);
}
public function run()
{
if ($this->shouldRunSilently()) {
echo "Running daemon '{$this->daemon}' silently. Use '--trace' or " . "'--verbose' to produce debugging output.\n";
}
$root = phutil_get_library_root('phutil');
$root = dirname($root);
$exec_dir = $root . '/scripts/daemon/exec/';
// NOTE: PHP implements proc_open() by running 'sh -c'. On most systems this
// is bash, but on Ubuntu it's dash. When you proc_open() using bash, you
// get one new process (the command you ran). When you proc_open() using
// dash, you get two new processes: the command you ran and a parent
// "dash -c" (or "sh -c") process. This means that the child process's PID
// is actually the 'dash' PID, not the command's PID. To avoid this, use
// 'exec' to replace the shell process with the real process; without this,
// the child will call posix_getppid(), be given the pid of the 'sh -c'
// process, and send it SIGUSR1 to keepalive which will terminate it
// immediately. We also won't be able to do process group management because
// the shell process won't properly posix_setsid() so the pgid of the child
// won't be meaningful.
$exec_daemon = './exec_daemon.php';
$argv = $this->argv;
array_unshift($argv, 'exec', $exec_daemon, $this->daemon);
foreach ($argv as $k => $arg) {
$argv[$k] = escapeshellarg($arg);
}
$command = implode(' ', $argv);
while (true) {
$this->logMessage('INIT', 'Starting process.');
$future = new ExecFuture($command);
$future->setCWD($exec_dir);
$future->setStdoutSizeLimit($this->captureBufferSize);
$future->setStderrSizeLimit($this->captureBufferSize);
$this->deadline = time() + $this->deadlineTimeout;
$this->heartbeat = time() + self::HEARTBEAT_WAIT;
$future->isReady();
$this->childPID = $future->getPID();
do {
do {
if ($this->traceMemory) {
$memuse = number_format(memory_get_usage() / 1024, 1);
$this->logMessage('RAMS', 'Overseer Memory Usage: ' . $memuse . ' KB');
}
// We need a shortish timeout here so we can run the tick handler
// frequently in order to process signals.
$result = $future->resolve(1);
list($stdout, $stderr) = $future->read();
$stdout = trim($stdout);
$stderr = trim($stderr);
if (strlen($stdout)) {
$this->logMessage('STDO', $stdout, $stdout);
}
if (strlen($stderr)) {
$this->logMessage('STDE', $stderr, $stderr);
}
$future->discardBuffers();
if ($result !== null) {
list($err) = $result;
if ($err) {
$this->logMessage('FAIL', 'Process exited with error ' . $err . '.', $err);
} else {
$this->logMessage('DONE', 'Process exited successfully.');
}
break 2;
}
if ($this->heartbeat < time()) {
$this->heartbeat = time() + self::HEARTBEAT_WAIT;
if ($this->conduitURI) {
try {
$this->conduit = new ConduitClient($this->conduitURI);
$this->conduit->callMethodSynchronous('daemon.setstatus', array('daemonLogID' => $this->daemonLogID, 'status' => 'run'));
} catch (Exception $ex) {
}
}
}
} while (time() < $this->deadline);
$this->logMessage('HANG', 'Hang detected. Restarting process.');
$this->annihilateProcessGroup();
} while (false);
$this->logMessage('WAIT', 'Waiting to restart process.');
sleep($this->restartDelay);
}
}
