public function initTransaction(CommandInterface $command)
{
$trans = new CommandTransaction($this, $command);
// Throwing in the init event WILL NOT emit an error event.
$command->getEmitter()->emit('init', new InitEvent($trans));
$trans->request = $this->serializeRequest($trans);
if ($future = $command->getFuture()) {
$trans->request->getConfig()->set('future', $future);
}
$trans->state = 'prepared';
$prep = new PreparedEvent($trans);
try {
$command->getEmitter()->emit('prepared', $prep);
} catch (\Exception $e) {
$trans->exception = $e;
$trans->exception = $this->createCommandException($trans);
}
// If the command failed in the prepare event or was intercepted, then
// emit the process event now and skip hooking up the request.
if ($trans->exception || $prep->isPropagationStopped()) {
$this->emitProcess($trans);
return $trans;
}
$trans->state = 'executing';
// When a request completes, process the request at the command
// layer.
$trans->request->getEmitter()->on('end', function (EndEvent $e) use($trans) {
$trans->response = $e->getResponse();
if ($trans->exception = $e->getException()) {
$trans->exception = $this->createCommandException($trans);
}
$this->emitProcess($trans);
}, RequestEvents::LATE);
return $trans;
}
