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390802ab DM |
1 | package PVE::Daemon; |
2 | ||
3 | # Abstract class to implement Daemons | |
4 | # | |
5 | # Features: | |
6 | # * lock and write PID file /var/run/$name.pid to make sure onyl | |
7 | # one instance is running. | |
8 | # * correctly daemonize (redirect STDIN/STDOUT) | |
4fc69176 DM |
9 | # * restart by stop/start, exec, or signal HUP |
10 | # * daemon restart on error (option 'restart_on_error') | |
11 | # | |
390802ab DM |
12 | |
13 | use strict; | |
14 | use warnings; | |
15 | use PVE::SafeSyslog; | |
16 | use PVE::INotify; | |
17 | ||
18 | use POSIX ":sys_wait_h"; | |
19 | use Fcntl ':flock'; | |
20 | use Getopt::Long; | |
21 | use Time::HiRes qw (gettimeofday); | |
22 | ||
23 | use base qw(PVE::CLIHandler); | |
24 | ||
25 | $SIG{'__WARN__'} = sub { | |
26 | my $err = $@; | |
27 | my $t = $_[0]; | |
28 | chomp $t; | |
29 | print "$t\n"; | |
30 | syslog('warning', "WARNING: %s", $t); | |
31 | $@ = $err; | |
32 | }; | |
33 | ||
34 | $ENV{'PATH'} = '/sbin:/bin:/usr/sbin:/usr/bin'; | |
35 | ||
36 | my $daemon_initialized = 0; # we only allow one instance | |
37 | ||
38 | my $lockpidfile = sub { | |
39 | my ($self) = @_; | |
40 | ||
41 | my $lkfn = $self->{pidfile} . ".lock"; | |
42 | ||
43 | if (!open (FLCK, ">>$lkfn")) { | |
44 | my $msg = "can't aquire lock on file '$lkfn' - $!"; | |
45 | syslog ('err', $msg); | |
46 | die "ERROR: $msg\n"; | |
47 | } | |
48 | ||
49 | if (!flock (FLCK, LOCK_EX|LOCK_NB)) { | |
50 | close (FLCK); | |
51 | my $msg = "can't aquire lock '$lkfn' - $!"; | |
52 | syslog ('err', $msg); | |
53 | die "ERROR: $msg\n"; | |
54 | } | |
55 | }; | |
56 | ||
57 | my $writepidfile = sub { | |
58 | my ($self) = @_; | |
59 | ||
60 | my $pidfile = $self->{pidfile}; | |
61 | ||
62 | if (!open (PIDFH, ">$pidfile")) { | |
63 | my $msg = "can't open pid file '$pidfile' - $!"; | |
64 | syslog ('err', $msg); | |
65 | die "ERROR: $msg\n"; | |
66 | } | |
67 | print PIDFH "$$\n"; | |
68 | close (PIDFH); | |
69 | }; | |
70 | ||
71 | my $server_cleanup = sub { | |
72 | my ($self) = @_; | |
73 | ||
74 | unlink $self->{pidfile} . ".lock"; | |
75 | unlink $self->{pidfile}; | |
76 | }; | |
77 | ||
78 | my $server_run = sub { | |
79 | my ($self, $debug) = @_; | |
80 | ||
81 | &$lockpidfile($self); | |
82 | ||
83 | # run in background | |
84 | my $spid; | |
85 | ||
86 | my $restart = $ENV{RESTART_PVE_DAEMON}; | |
87 | ||
88 | delete $ENV{RESTART_PVE_DAEMON}; | |
89 | ||
90 | $self->{debug} = 1 if $debug; | |
91 | ||
92 | $self->init(); | |
93 | ||
94 | if (!$debug) { | |
95 | open STDIN, '</dev/null' || die "can't read /dev/null"; | |
96 | open STDOUT, '>/dev/null' || die "can't write /dev/null"; | |
97 | } | |
98 | ||
99 | if (!$restart && !$debug) { | |
100 | PVE::INotify::inotify_close(); | |
101 | $spid = fork(); | |
102 | if (!defined ($spid)) { | |
103 | my $msg = "can't put server into background - fork failed"; | |
104 | syslog('err', $msg); | |
105 | die "ERROR: $msg\n"; | |
106 | } elsif ($spid) { # parent | |
107 | exit (0); | |
108 | } | |
109 | PVE::INotify::inotify_init(); | |
110 | } | |
111 | ||
112 | &$writepidfile($self); | |
113 | ||
891b9097 DM |
114 | POSIX::setsid(); |
115 | ||
390802ab DM |
116 | if ($restart) { |
117 | syslog('info' , "restarting server"); | |
118 | } else { | |
119 | syslog('info' , "starting server"); | |
120 | } | |
121 | ||
122 | open STDERR, '>&STDOUT' || die "can't close STDERR\n"; | |
123 | ||
124 | $SIG{INT} = $SIG{TERM} = $SIG{QUIT} = sub { | |
125 | $SIG{INT} = 'DEFAULT'; | |
126 | ||
127 | eval { $self->shutdown(); }; | |
128 | warn $@ if $@; | |
129 | ||
130 | &$server_cleanup($self); | |
390802ab DM |
131 | }; |
132 | ||
bdb5acce DM |
133 | if ($self->can('hup')) { |
134 | $SIG{HUP} = sub { | |
135 | eval { $self->hup() }; | |
136 | warn $@ if $@; | |
137 | }; | |
138 | } | |
139 | ||
390802ab DM |
140 | eval { $self->run() }; |
141 | my $err = $@; | |
142 | ||
143 | if ($err) { | |
144 | syslog ('err', "ERROR: $err"); | |
145 | if (my $wait_time = $self->{restart_on_error}) { | |
146 | $self->restart_daemon($wait_time); | |
147 | } else { | |
148 | $self->exit_daemon(-1); | |
149 | } | |
150 | } | |
151 | ||
152 | $self->exit_daemon(0); | |
153 | }; | |
154 | ||
155 | sub new { | |
156 | my ($this, $name, $cmdline, %params) = @_; | |
157 | ||
158 | die "please run as root\n" if $> != 0; | |
159 | ||
160 | die "missing name" if !$name; | |
161 | ||
162 | die "can't create more that one PVE::Daemon" if $daemon_initialized; | |
163 | $daemon_initialized = 1; | |
164 | ||
165 | PVE::INotify::inotify_init(); | |
166 | ||
167 | initlog($name); | |
168 | ||
169 | my $class = ref($this) || $this; | |
170 | ||
bdb5acce DM |
171 | my $self = bless { |
172 | name => $name, | |
173 | run_dir => '/var/run', | |
174 | }, $class; | |
390802ab DM |
175 | |
176 | foreach my $opt (keys %params) { | |
177 | my $value = $params{$opt}; | |
178 | if ($opt eq 'restart_on_error') { | |
179 | $self->{$opt} = $value; | |
180 | } elsif ($opt eq 'stop_wait_time') { | |
181 | $self->{$opt} = $value; | |
bdb5acce DM |
182 | } elsif ($opt eq 'run_dir') { |
183 | $self->{$opt} = $value; | |
390802ab DM |
184 | } else { |
185 | die "unknown option '$opt'"; | |
186 | } | |
187 | } | |
188 | ||
bdb5acce DM |
189 | $self->{pidfile} = "$self->{run_dir}/${name}.pid"; |
190 | ||
191 | $self->{nodename} = PVE::INotify::nodename(); | |
192 | ||
193 | $self->{cmdline} = $cmdline; | |
194 | ||
195 | $0 = $name; | |
196 | ||
197 | ||
390802ab DM |
198 | return $self; |
199 | } | |
200 | ||
201 | sub exit_daemon { | |
202 | my ($self, $status) = @_; | |
203 | ||
204 | syslog("info", "server stopped"); | |
205 | ||
206 | &$server_cleanup($self); | |
207 | ||
208 | exit($status); | |
209 | } | |
210 | ||
211 | sub restart_daemon { | |
212 | my ($self, $waittime) = @_; | |
213 | ||
214 | syslog('info', "server shutdown (restart)"); | |
215 | ||
216 | $ENV{RESTART_PVE_DAEMON} = 1; | |
217 | ||
218 | sleep($waittime) if $waittime; # avoid high server load due to restarts | |
219 | ||
220 | PVE::INotify::inotify_close(); | |
221 | ||
222 | exec (@{$self->{cmdline}}); | |
223 | ||
224 | exit (-1); # never reached? | |
225 | } | |
226 | ||
227 | # please overwrite in subclass | |
228 | # this is called at startup - before forking | |
229 | sub init { | |
230 | my ($self) = @_; | |
231 | ||
232 | } | |
233 | ||
234 | # please overwrite in subclass | |
235 | sub shutdown { | |
236 | my ($self) = @_; | |
237 | ||
238 | syslog('info' , "server closing"); | |
239 | ||
240 | # wait for children | |
241 | 1 while (waitpid(-1, POSIX::WNOHANG()) > 0); | |
242 | } | |
243 | ||
bdb5acce DM |
244 | # please define in subclass |
245 | #sub hup { | |
246 | # my ($self) = @_; | |
247 | # | |
248 | # syslog('info' , "received signal HUP (restart)"); | |
249 | #} | |
390802ab DM |
250 | |
251 | # please overwrite in subclass | |
252 | sub run { | |
253 | my ($self) = @_; | |
254 | ||
255 | for (;;) { # forever | |
256 | syslog('info' , "server is running"); | |
257 | sleep(5); | |
258 | } | |
259 | } | |
260 | ||
261 | sub start { | |
262 | my ($self, $debug) = @_; | |
263 | ||
264 | &$server_run($self, $debug); | |
265 | } | |
266 | ||
bdb5acce DM |
267 | my $read_pid = sub { |
268 | my ($self) = @_; | |
269 | ||
270 | my $pid_str = PVE::Tools::file_read_firstline($self->{pidfile}); | |
271 | ||
272 | return 0 if !$pid_str; | |
273 | ||
274 | return 0 if $pid_str !~ m/^(\d+)$/; # untaint | |
275 | ||
276 | my $pid = int($1); | |
277 | ||
278 | return $pid; | |
279 | }; | |
280 | ||
390802ab DM |
281 | sub running { |
282 | my ($self) = @_; | |
283 | ||
bdb5acce | 284 | my $pid = &$read_pid($self); |
390802ab DM |
285 | |
286 | if ($pid) { | |
287 | my $res = PVE::ProcFSTools::check_process_running($pid) ? 1 : 0; | |
288 | return wantarray ? ($res, $pid) : $res; | |
289 | } | |
290 | ||
291 | return wantarray ? (0, 0) : 0; | |
292 | } | |
293 | ||
294 | sub stop { | |
295 | my ($self) = @_; | |
296 | ||
bdb5acce DM |
297 | my $pid = &$read_pid($self); |
298 | ||
390802ab DM |
299 | return if !$pid; |
300 | ||
301 | if (PVE::ProcFSTools::check_process_running($pid)) { | |
302 | kill(15, $pid); # send TERM signal | |
303 | # give some time | |
304 | my $wait_time = $self->{stop_wait_time} || 5; | |
305 | my $running = 1; | |
306 | for (my $i = 0; $i < $wait_time; $i++) { | |
307 | $running = PVE::ProcFSTools::check_process_running($pid); | |
308 | last if !$running; | |
309 | sleep (1); | |
310 | } | |
311 | ||
312 | syslog('err', "server still running - send KILL") if $running; | |
313 | ||
314 | # to be sure | |
315 | kill(9, $pid); | |
316 | waitpid($pid, 0); | |
317 | } | |
318 | ||
319 | if (-f $self->{pidfile}) { | |
320 | # try to get the lock | |
321 | &$lockpidfile($self); | |
322 | &$server_cleanup($self); | |
323 | } | |
324 | } | |
325 | ||
326 | sub register_start_command { | |
327 | my ($self, $class, $description) = @_; | |
328 | ||
329 | $class->register_method({ | |
330 | name => 'start', | |
331 | path => 'start', | |
332 | method => 'POST', | |
333 | description => $description || "Start the daemon.", | |
334 | parameters => { | |
335 | additionalProperties => 0, | |
336 | properties => { | |
337 | debug => { | |
338 | description => "Debug mode - stay in foreground", | |
339 | type => "boolean", | |
340 | optional => 1, | |
341 | default => 0, | |
342 | }, | |
343 | }, | |
344 | }, | |
345 | returns => { type => 'null' }, | |
346 | ||
347 | code => sub { | |
348 | my ($param) = @_; | |
349 | ||
350 | $self->start($param->{debug}); | |
351 | ||
352 | return undef; | |
353 | }}); | |
354 | } | |
355 | ||
bdb5acce DM |
356 | my $reload_daemon = sub { |
357 | my ($self, $use_hup) = @_; | |
358 | ||
359 | if (my $restart = $ENV{RESTART_PVE_DAEMON}) { | |
360 | $self->start(); | |
361 | } else { | |
362 | my ($running, $pid) = $self->running(); | |
363 | if (!$running) { | |
364 | $self->start(); | |
365 | } else { | |
366 | if ($use_hup) { | |
367 | kill(1, $pid); | |
368 | } else { | |
369 | $self->stop(); | |
370 | $self->start(); | |
371 | } | |
372 | } | |
373 | } | |
374 | }; | |
375 | ||
390802ab | 376 | sub register_restart_command { |
bdb5acce | 377 | my ($self, $class, $use_hup, $description) = @_; |
390802ab DM |
378 | |
379 | $class->register_method({ | |
380 | name => 'restart', | |
381 | path => 'restart', | |
382 | method => 'POST', | |
383 | description => $description || "Restart the daemon (or start if not running).", | |
384 | parameters => { | |
385 | additionalProperties => 0, | |
386 | properties => {}, | |
387 | }, | |
388 | returns => { type => 'null' }, | |
389 | ||
390 | code => sub { | |
391 | my ($param) = @_; | |
392 | ||
bdb5acce DM |
393 | &$reload_daemon($self, $use_hup); |
394 | ||
395 | return undef; | |
396 | }}); | |
397 | } | |
398 | ||
399 | sub register_reload_command { | |
400 | my ($self, $class, $description) = @_; | |
401 | ||
402 | $class->register_method({ | |
403 | name => 'reload', | |
404 | path => 'reload', | |
405 | method => 'POST', | |
406 | description => $description || "Reload daemon configuration (or start if not running).", | |
407 | parameters => { | |
408 | additionalProperties => 0, | |
409 | properties => {}, | |
410 | }, | |
411 | returns => { type => 'null' }, | |
412 | ||
413 | code => sub { | |
414 | my ($param) = @_; | |
415 | ||
416 | &$reload_daemon($self, 1); | |
390802ab DM |
417 | |
418 | return undef; | |
419 | }}); | |
420 | } | |
421 | ||
422 | sub register_stop_command { | |
423 | my ($self, $class, $description) = @_; | |
424 | ||
425 | $class->register_method({ | |
426 | name => 'stop', | |
427 | path => 'stop', | |
428 | method => 'POST', | |
429 | description => $description || "Stop the daemon.", | |
430 | parameters => { | |
431 | additionalProperties => 0, | |
432 | properties => {}, | |
433 | }, | |
434 | returns => { type => 'null' }, | |
435 | ||
436 | code => sub { | |
437 | my ($param) = @_; | |
438 | ||
439 | $self->stop(); | |
440 | ||
441 | return undef; | |
442 | }}); | |
443 | } | |
444 | ||
445 | sub register_status_command { | |
446 | my ($self, $class, $description) = @_; | |
447 | ||
448 | $class->register_method({ | |
449 | name => 'status', | |
450 | path => 'status', | |
451 | method => 'GET', | |
452 | description => "Get daemon status.", | |
453 | parameters => { | |
454 | additionalProperties => 0, | |
455 | properties => {}, | |
456 | }, | |
457 | returns => { | |
458 | type => 'string', | |
459 | enum => ['stopped', 'running'], | |
460 | }, | |
461 | code => sub { | |
462 | my ($param) = @_; | |
463 | ||
464 | return $self->running() ? 'running' : 'stopped'; | |
465 | }}); | |
466 | } | |
467 | ||
468 | 1; | |
469 |