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First almost working version of daemons

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This commit is contained in:
osaajani 2019-12-12 00:56:30 +01:00
parent e709ed91b7
commit 6614c2cfeb
9 changed files with 491 additions and 20 deletions
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88
daemons/AbstractDaemon.php
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@ -8,6 +8,8 @@ namespace daemons;
abstract class AbstractDaemon
{
protected $name;
protected $uniq;
protected $logger;
private $is_running = true;
private $signals = array (
SIGTERM,
@ -19,13 +21,19 @@ abstract class AbstractDaemon
/**
* Class used to handle POSIX signals and fork from the current process
*
* @param string $name : The name of the class
* @param array $signals :An array containing additional POSIX signals to handle [optionel]
* @param string $name : The name of the class
* @param object $logger : A PSR3 logger instance
* @param string $pid_dir : Directory for the pid files
* @param array $signals :An array containing additional POSIX signals to handle [optionel]
* @param bool $uniq : Must the process be uniq ?
*/
protected function __construct (string $name, array $signals = [])
protected function __construct (string $name, object $logger, string $pid_dir = '/var/run', array $signals = [], bool $uniq = false)
{
$this->name = $name;
$this->name = $name;
$this->logger = $logger;
$this->signals = array_merge($this->signals, $signals);
$this->uniq = $uniq;
$this->pid_dir = $pid_dir;
//Allow script to run indefinitly
set_time_limit(0);
@ -86,13 +94,73 @@ abstract class AbstractDaemon
*/
protected function start ()
{
$this->on_start();
while ($this->is_running)
//If process must be uniq and a process with the same pid file is already running
if (file_exists($this->pid_dir . '/' . $this->name . '.pid') && $this->uniq)
{
pcntl_signal_dispatch(); //Call dispatcher for signals
$this->run();
}
$this->on_stop();
echo "Another process named " . $this->name . " is already running.\n";
return false;
}
$pid = pcntl_fork(); //Fork current process into a child, so we will be able to later make the child indepedant, kill current process and keep only the child
if ($pid == -1) //Impossible to run script
{
echo "Impossible to create a subprocess.\n";
return false;
}
elseif ($pid) //Current script
{
echo "Child process started with pid " . $pid . ".\n";
return true;
}
//Child script
$sid = posix_setsid(); //Try to make the child process a main process
if ($sid == -1) //Error
{
$this->logger->critical('Cannot make the child process independent.');
exit(1);
}
//Create pid dir if not exists
if (!file_exists($this->pid_dir))
{
$success = mkdir($this->pid_dir, 0777, true);
if (!$success)
{
$this->logger->critical('Cannot create PID directory : ' . $this->pid_dir);
exit(2);
}
}
//Set process name
cli_set_process_title($this->name);
//Write the pid of the process into a file
file_put_contents($this->pid_dir . '/' . $this->name . '.pid', getmypid());
$this->on_start();
try
{
while ($this->is_running)
{
pcntl_signal_dispatch(); //Call dispatcher for signals
$this->run();
}
}
catch (\Exception $e)
{
$this->logger->critical('Exception : ' . $e->getMessage() . " in " . $e->getFile() . " line " . $e->getLine());
}
$this->on_stop();
//Delete pid file
if (file_exists($this->pid_dir . '/' . $this->name . '.pid'))
{
unlink($this->pid_dir . '/' . $this->name . '.pid');
}
}