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Code Issues Releases Wiki Activity

Resolve all futures inside FutureIterator

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Summary:
Depends on D21032. Ref T11968. Currently, "Future" and "FutureIterator" can both resolve futures.

Treat "Future->resolve()" as sugar on resolving an iterator of size 1.

Test Plan: Ran tests, created this revision.

Maniphest Tasks: T11968

Differential Revision: https://secure.phabricator.com/D21033
This commit is contained in:
epriestley 2020-02-26 11:31:54 -08:00
parent 3df48c9257
commit e20dce875c
2 changed files with 61 additions and 81 deletions
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82
src/future/Future.php
View file

@ -7,8 +7,6 @@
*/
abstract class Future extends Phobject {
protected static $handlerInstalled = null;
protected $result;
protected $exception;
@ -37,22 +35,13 @@ abstract class Future extends Phobject {
'timeout.'));
}
$wait = $this->getDefaultWait();
do {
$this->checkException();
if ($this->isReady()) {
break;
$graph = new FutureIterator(array($this));
$graph->resolveAll();
if ($this->exception) {
throw $this->exception;
}
$read = $this->getReadSockets();
$write = $this->getWriteSockets();
if ($read || $write) {
self::waitForSockets($read, $write, $wait);
}
} while (true);
$this->checkException();
return $this->getResult();
}
@ -65,17 +54,6 @@ abstract class Future extends Phobject {
return $this->exception;
}
/**
* If an exception was set by setException(), throw it.
*/
private function checkException() {
if ($this->exception) {
throw $this->exception;
}
}
/**
* Retrieve a list of sockets which we can wait to become readable while
* a future is resolving. If your future has sockets which can be
@ -101,56 +79,6 @@ abstract class Future extends Phobject {
}
/**
* Wait for activity on one of several sockets.
*
* @param list List of sockets expected to become readable.
* @param list List of sockets expected to become writable.
* @param float Timeout, in seconds.
* @return void
*/
public static function waitForSockets(
array $read_list,
array $write_list,
$timeout = 1) {
if (!self::$handlerInstalled) {
// If we're spawning child processes, we need to install a signal handler
// here to catch cases like execing '(sleep 60 &) &' where the child
// exits but a socket is kept open. But we don't actually need to do
// anything because the SIGCHLD will interrupt the stream_select(), as
// long as we have a handler registered.
if (function_exists('pcntl_signal')) {
if (!pcntl_signal(SIGCHLD, array(__CLASS__, 'handleSIGCHLD'))) {
throw new Exception(pht('Failed to install signal handler!'));
}
}
self::$handlerInstalled = true;
}
$timeout_sec = (int)$timeout;
$timeout_usec = (int)(1000000 * ($timeout - $timeout_sec));
$exceptfds = array();
$ok = @stream_select(
$read_list,
$write_list,
$exceptfds,
$timeout_sec,
$timeout_usec);
if ($ok === false) {
// Hopefully, means we received a SIGCHLD. In the worst case, we degrade
// to a busy wait.
}
}
public static function handleSIGCHLD($signo) {
// This function is a dummy, we just need to have some handler registered
// so that PHP will get interrupted during stream_select(). If we don't
// register a handler, stream_select() won't fail.
}
/**
* Retrieve the final result of the future. This method will be called after
* the future is ready (as per @{method:isReady}) but before results are

60
src/future/FutureIterator.php
View file

@ -63,9 +63,7 @@ final class FutureIterator extends Phobject implements Iterator {
* @task basics
*/
public function resolveAll() {
foreach ($this as $future) {
$future->resolve();
}
iterator_to_array($this);
}
/**
@ -246,7 +244,7 @@ final class FutureIterator extends Phobject implements Iterator {
}
if ($can_use_sockets) {
Future::waitForSockets($read_sockets, $write_sockets, $wait_time);
$this->waitForSockets($read_sockets, $write_sockets, $wait_time);
} else {
usleep(1000);
}
@ -324,4 +322,58 @@ final class FutureIterator extends Phobject implements Iterator {
}
}
/**
* Wait for activity on one of several sockets.
*
* @param list List of sockets expected to become readable.
* @param list List of sockets expected to become writable.
* @param float Timeout, in seconds.
* @return void
*/
private function waitForSockets(
array $read_list,
array $write_list,
$timeout = 1.0) {
static $handler_installed = false;
if (!$handler_installed) {
// If we're spawning child processes, we need to install a signal handler
// here to catch cases like execing '(sleep 60 &) &' where the child
// exits but a socket is kept open. But we don't actually need to do
// anything because the SIGCHLD will interrupt the stream_select(), as
// long as we have a handler registered.
if (function_exists('pcntl_signal')) {
if (!pcntl_signal(SIGCHLD, array(__CLASS__, 'handleSIGCHLD'))) {
throw new Exception(pht('Failed to install signal handler!'));
}
}
$handler_installed = true;
}
$timeout_sec = (int)$timeout;
$timeout_usec = (int)(1000000 * ($timeout - $timeout_sec));
$exceptfds = array();
$ok = @stream_select(
$read_list,
$write_list,
$exceptfds,
$timeout_sec,
$timeout_usec);
if ($ok === false) {
// Hopefully, means we received a SIGCHLD. In the worst case, we degrade
// to a busy wait.
}
}
public static function handleSIGCHLD($signo) {
// This function is a dummy, we just need to have some handler registered
// so that PHP will get interrupted during "stream_select()". If we don't
// register a handler, "stream_select()" won't fail.
}
}