1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
<?php
namespace gipfl\SimpleDaemon;
use Exception;
use gipfl\Cli\Process;
use gipfl\SystemD\NotifySystemD;
use Psr\Log\LoggerAwareInterface;
use Psr\Log\LoggerAwareTrait;
use Psr\Log\NullLogger;
use React\EventLoop\LoopInterface;
use React\Promise\Deferred;
use function React\Promise\resolve;
use function React\Promise\Timer\timeout;
use function sprintf;
class Daemon implements LoggerAwareInterface
{
use LoggerAwareTrait;
/** @var LoopInterface */
private $loop;
/** @var NotifySystemD|boolean */
protected $systemd;
/** @var DaemonTask[] */
protected $daemonTasks = [];
/** @var bool */
protected $tasksStarted = false;
/** @var bool */
protected $reloading = false;
public function run(LoopInterface $loop)
{
if ($this->logger === null) {
$this->setLogger(new NullLogger());
}
$this->loop = $loop;
$this->registerSignalHandlers();
$this->systemd = NotifySystemD::ifRequired($loop);
$loop->futureTick(function () {
if ($this->systemd) {
$this->systemd->setReady();
}
$this->startTasks();
});
}
public function attachTask(DaemonTask $task)
{
if ($task instanceof LoggerAwareInterface) {
$task->setLogger($this->logger ?: new NullLogger());
}
$this->daemonTasks[] = $task;
if ($this->tasksStarted) {
$this->startTask($task);
}
}
protected function startTasks()
{
$this->tasksStarted = true;
foreach ($this->daemonTasks as $task) {
$this->startTask($task);
}
}
protected function startTask(DaemonTask $task)
{
if ($this->systemd && $task instanceof SystemdAwareTask) {
$task->setSystemd($this->systemd);
}
$task->start($this->loop);
}
protected function stopTasks()
{
if (empty($this->daemonTasks)) {
return resolve();
}
$deferred = new Deferred();
foreach ($this->daemonTasks as $id => $task) {
$task->stop()->always(function () use ($id, $deferred) {
unset($this->daemonTasks[$id]);
if (empty($this->daemonTasks)) {
$this->tasksStarted = false;
$this->loop->futureTick(function () use ($deferred) {
$deferred->resolve();
});
}
});
}
return $deferred->promise();
}
protected function registerSignalHandlers()
{
$func = function ($signal) use (&$func) {
$this->shutdownWithSignal($signal, $func);
};
$funcReload = function () {
$this->reload();
};
$this->loop->addSignal(SIGHUP, $funcReload);
$this->loop->addSignal(SIGINT, $func);
$this->loop->addSignal(SIGTERM, $func);
}
protected function shutdownWithSignal($signal, &$func)
{
$this->loop->removeSignal($signal, $func);
$this->shutdown();
}
public function reload()
{
if ($this->reloading) {
$this->logger->error('Ignoring reload request, reload is already in progress');
return;
}
$this->reloading = true;
$this->logger->notice('Stopping tasks, going gown for reload now');
if ($this->systemd) {
$this->systemd->setReloading('Reloading the main process');
}
$this->stopTasks()->then(function () {
$this->logger->notice('Everything stopped, restarting');
Process::restart();
});
}
public function shutdown()
{
timeout($this->stopTasks(), 5, $this->loop)->then(function () {
$this->loop->stop();
}, function (Exception $e) {
if ($this->logger) {
$this->logger->error(sprintf(
'Failed to safely shutdown, stopping anyways: %s',
$e->getMessage()
));
}
$this->loop->addTimer(0.1, function () {
$this->loop->stop();
});
});
}
}
|
