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Implement semaphore retry. Make not getting the semaphore an error

This commit is contained in:
Isaac Connor 2021-12-17 09:41:45 -05:00
parent 1bc0e1820e
commit edbe726e86
1 changed files with 15 additions and 6 deletions
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21
web/ajax/stream.php
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@ -1,5 +1,5 @@
<?php
error_reporting(0);
error_reporting(0);
$start_time = time();
@ -7,7 +7,7 @@ define('MSG_TIMEOUT', ZM_WEB_AJAX_TIMEOUT/2);
define('MSG_DATA_SIZE', 4+256);
if ( !($_REQUEST['connkey'] && $_REQUEST['command']) ) {
ajaxError("Unexpected received message type '$type'");
ajaxError('No connkey or no command in stream ajax');
}
mkdir(ZM_PATH_SOCKS);
@ -15,7 +15,17 @@ mkdir(ZM_PATH_SOCKS);
# The file that we point ftok to has to exist, and only exist if zms is running, so we are pointing it at the .sock
$key = ftok(ZM_PATH_SOCKS.'/zms-'.sprintf('%06d',$_REQUEST['connkey']).'s.sock', 'Z');
$semaphore = sem_get($key,1);
if ( sem_acquire($semaphore,1) !== false ) {
$semaphore_tries = 10;
$have_semaphore = false;
while ( $semaphore_tries ) {
$have_semaphore = sem_acquire($semaphore,1);
if ($have_semaphore !== false) break;
ZM\Debug("Failed to get semaphore, trying again");
usleep(100000);
$semaphore_tries -= 1;
}
if ($have_semaphore) {
if ( !($socket = @socket_create(AF_UNIX, SOCK_DGRAM, 0)) ) {
ajaxError('socket_create() failed: '.socket_strerror(socket_last_error()));
}
@ -161,12 +171,11 @@ if ( sem_acquire($semaphore,1) !== false ) {
ajaxResponse(array('status'=>$data));
break;
default :
ajaxError("Unexpected received message type '$type'");
ajaxError('Unexpected received message type '.$data['type']);
}
sem_release($semaphore);
} else {
ZM\Debug('Couldn\'t get semaphore');
ajaxResponse(array());
ajaxError("Unable to get semaphore.");
}
ajaxError('Unrecognised action or insufficient permissions in ajax/stream');