1 |
## ------------------------------------------------------------------------ |
2 |
## $Id: LookupClient.pm,v 1.5 2003/07/01 18:13:15 joko Exp $ |
3 |
## ------------------------------------------------------------------------ |
4 |
## $Log: LookupClient.pm,v $ |
5 |
## Revision 1.5 2003/07/01 18:13:15 joko |
6 |
## fixed: shutdown and session-unaliasing seems to be done by gc now...? |
7 |
## |
8 |
## Revision 1.3 2003/07/01 13:13:44 joko |
9 |
## made "port" and "host" configurable from script |
10 |
## |
11 |
## Revision 1.2 2003/07/01 13:05:01 joko |
12 |
## major changes, tried to clean up shutdown phase - the watchdog-mech didn't work out well..... - what's about IKC's monitor? does it work on Linux? |
13 |
## |
14 |
## Revision 1.1 2003/06/29 01:35:29 joko |
15 |
## initial commit |
16 |
## |
17 |
## ------------------------------------------------------------------------ |
18 |
|
19 |
|
20 |
package POE::Component::LookupClient; |
21 |
|
22 |
use strict; |
23 |
use warnings; |
24 |
|
25 |
use POE qw( Session Component::IKC::Client ); |
26 |
use Data::Dumper; |
27 |
|
28 |
|
29 |
sub new { |
30 |
my $classname = shift; |
31 |
my @args = @_; |
32 |
|
33 |
my $self = {}; |
34 |
bless $self, $classname; |
35 |
|
36 |
$self->{options} = { @args }; |
37 |
|
38 |
#my $event_handler = lookupd->new(); |
39 |
POE::Session->create( |
40 |
object_states => [ |
41 |
$self => [qw( _start _stop boot_intercom start_session waste_time watchdog )] |
42 |
] |
43 |
); |
44 |
|
45 |
} |
46 |
|
47 |
# This is not a POE method. It's a plain OO one. |
48 |
sub debug { |
49 |
my $self = shift; |
50 |
my $msg = shift; |
51 |
$msg ||= ''; |
52 |
print STDERR __PACKAGE__ . ": " . $msg, "\n"; |
53 |
} |
54 |
|
55 |
# Controller's event handlers |
56 |
|
57 |
sub _start { |
58 |
my ( $self, $kernel, $heap ) = @_[ OBJECT, KERNEL, HEAP ]; |
59 |
$self->debug("_start"); |
60 |
|
61 |
#$kernel->alias_set("controller"); |
62 |
|
63 |
#$kernel->post( controller => 'start_daemon' ); |
64 |
#$kernel->yield( 'boot_storage' ); |
65 |
$kernel->yield( 'boot_intercom' ); |
66 |
#$_[HEAP]->{subsession} = POE::Session->create( inline_states => { _start => sub { print "WORKER!", "\n"; } } ); |
67 |
#$_[HEAP]->{subsession}->yield( |
68 |
|
69 |
}; |
70 |
|
71 |
sub _stop { |
72 |
my ( $self, $kernel, $heap ) = @_[ OBJECT, KERNEL, HEAP ]; |
73 |
$self->debug("_stop"); |
74 |
}; |
75 |
|
76 |
sub boot_intercom { |
77 |
|
78 |
my ( $self, $kernel, $heap ) = @_[ OBJECT, KERNEL, HEAP ]; |
79 |
$self->debug("boot_intercom"); |
80 |
|
81 |
# Client component - encapsulates some session(s) and/or wheel(s)? |
82 |
|
83 |
$self->{options}->{host} ||= "localhost"; |
84 |
$self->{options}->{port} ||= 30; |
85 |
|
86 |
#create_ikc_client( host => $host, port => 30, name => 'Client', on_connect => $self->{options}->{on_connect} ); |
87 |
create_ikc_client( |
88 |
ip => $self->{options}->{host}, |
89 |
port => $self->{options}->{port}, |
90 |
#name => 'Client', |
91 |
#on_connect => sub { $self->build(); }, |
92 |
on_connect => sub { $self->build(); }, |
93 |
#subscribe => [qw( poe://LookupService/ServiceRegistrar )], |
94 |
#subscribe => [qw( poe://LookupService/ServiceRegistrar )], |
95 |
); |
96 |
|
97 |
#$kernel->post( IKC => 'monitor', '*' => { register => 'start_session' }); |
98 |
#$kernel->post( IKC => 'monitor', 'LookupService' => { register => 'start_session' }); |
99 |
#$kernel->post( IKC => 'subscribe', [qw( poe://LookupService/ServiceRegistrar )], 'poe:start_session' ); |
100 |
|
101 |
# start up the watchdog which monitors the required IKC intercom session |
102 |
#$kernel->yield('waste_time'); |
103 |
$kernel->delay('watchdog', 2); |
104 |
|
105 |
}; |
106 |
|
107 |
sub start_session { |
108 |
#my $self = shift; |
109 |
print STDERR "start_session", "\n"; |
110 |
} |
111 |
|
112 |
sub build { |
113 |
my $self = shift; |
114 |
#print "build", "\n"; |
115 |
# create sessions that depend on the foreign kernel. |
116 |
POE::Component::LookupClient::Session->new(); |
117 |
} |
118 |
|
119 |
sub watchdog { |
120 |
my ( $self, $kernel, $heap ) = @_[ OBJECT, KERNEL, HEAP ]; |
121 |
$self->debug("watchdog"); |
122 |
|
123 |
#$kernel->post( IKC => 'monitor', '*' => { register => 'start_session' }); |
124 |
|
125 |
if (not defined $kernel->alias_resolve('DeviceClient')) { |
126 |
#if (not defined $kernel->alias_resolve('IKC')) { |
127 |
print STDERR "Session died, trying to restart!", "\n"; |
128 |
$kernel->yield('boot_intercom'); |
129 |
return; |
130 |
} |
131 |
|
132 |
$kernel->delay('watchdog', 2); |
133 |
}; |
134 |
|
135 |
#------------------------------------------------------------------------------ |
136 |
# This event keeps this POE kernel alive. |
137 |
# (stolen from POE::Component::IKC::Server, but not used 'til now...) |
138 |
sub waste_time { |
139 |
my($kernel, $heap)=@_[KERNEL, HEAP]; |
140 |
return if $heap->{'is a child'}; |
141 |
|
142 |
unless($heap->{'been told we are parent'}) { |
143 |
warn "$$: Telling everyone we are the parent\n"; |
144 |
$heap->{'been told we are parent'}=1; |
145 |
$kernel->signal($kernel, '__parent'); |
146 |
} |
147 |
if($heap->{'die'}) { |
148 |
#DEBUG and warn "$$: Orderly shutdown\n"; |
149 |
} else { |
150 |
$kernel->yield('watchdog'); |
151 |
$kernel->delay('waste_time', 60); |
152 |
} |
153 |
return; |
154 |
} |
155 |
|
156 |
|
157 |
|
158 |
|
159 |
package POE::Component::LookupClient::Session; |
160 |
|
161 |
use strict; |
162 |
use warnings; |
163 |
|
164 |
use POE qw( Session ); |
165 |
use Data::Dumper; |
166 |
|
167 |
|
168 |
sub new { |
169 |
my $classname = shift; |
170 |
my @args = @_; |
171 |
|
172 |
my $self = {}; |
173 |
bless $self, $classname; |
174 |
|
175 |
$self->{options} = { @args }; |
176 |
|
177 |
POE::Session->create( |
178 |
object_states => [ |
179 |
$self => [qw( _start _stop on_response on_subscribe register_lease renew_lease remote_shutdown remote_timeout )] |
180 |
] |
181 |
); |
182 |
|
183 |
} |
184 |
|
185 |
|
186 |
# This is not a POE method. It's a plain OO one. |
187 |
sub debug { |
188 |
my $self = shift; |
189 |
my $msg = shift; |
190 |
$msg ||= ''; |
191 |
print STDERR __PACKAGE__ . ": " . $msg, "\n"; |
192 |
} |
193 |
|
194 |
# Controller's event handlers |
195 |
|
196 |
sub _start { |
197 |
my ( $self, $kernel, $heap ) = @_[ OBJECT, KERNEL, HEAP ]; |
198 |
$self->debug("_start"); |
199 |
|
200 |
#$kernel->alias_set(''); |
201 |
#$kernel->post(); |
202 |
|
203 |
#sub POE::Component::IKC::Responder::DEBUG { 1 } |
204 |
#sub POE::Component::IKC::Responder::Object::DEBUG { 1 } |
205 |
|
206 |
# set up communication channel for asynchronous responses |
207 |
$kernel->alias_set('DeviceClient'); |
208 |
$kernel->post('IKC', 'publish', 'DeviceClient', [qw( on_response )]); |
209 |
|
210 |
#$kernel->post( IKC => 'subscribe', [qw( poe://LookupService/ServiceRegistrar )], 'poe:start_session' ); |
211 |
|
212 |
$kernel->post( IKC => 'subscribe', [qw( poe://LookupService/ServiceRegistrar )], 'on_subscribe' ); |
213 |
|
214 |
# try to register on startup? |
215 |
#$kernel->yield('register_lease'); |
216 |
|
217 |
}; |
218 |
|
219 |
sub _stop { |
220 |
my ( $self, $kernel, $heap ) = @_[ OBJECT, KERNEL, HEAP ]; |
221 |
$self->debug("_stop"); |
222 |
|
223 |
# try to re-register if session dies? |
224 |
#$kernel->yield('register_lease'); |
225 |
|
226 |
#$kernel->alias_remove('DeviceClient'); |
227 |
|
228 |
#$self = undef; |
229 |
}; |
230 |
|
231 |
|
232 |
# Subscription receipt callback, see "perldoc POE::Component::IKC::Responder". |
233 |
sub on_subscribe { |
234 |
my ( $self, $kernel, $heap ) = @_[ OBJECT, KERNEL, HEAP ]; |
235 |
$self->debug("on_subscribe"); |
236 |
# register lease on subscription |
237 |
$kernel->yield('register_lease'); |
238 |
} |
239 |
|
240 |
# Main response dispatcher, this should dispatch to local states programmatically. |
241 |
sub on_response { |
242 |
my ( $self, $kernel, $heap ) = @_[ OBJECT, KERNEL, HEAP ]; |
243 |
#$self->debug("response"); |
244 |
|
245 |
$heap->{'cancel timeout'} = 1; |
246 |
|
247 |
my $payload = $_[ARG0]; |
248 |
$payload ||= ''; |
249 |
|
250 |
# If registration succeeded, start the renewal cycle. |
251 |
if ($payload eq 'REG_OK') { |
252 |
$self->debug("Starting lease renewal loop."); |
253 |
$kernel->post( IKC => 'monitor', '*' => { unregister => 'remote_shutdown' }); |
254 |
$kernel->post( IKC => 'monitor', '*' => { shutdown => 'remote_shutdown' }); |
255 |
$kernel->yield( 'renew_lease' ); |
256 |
|
257 |
} elsif ($payload eq 'LEASE_OK') { |
258 |
$self->debug("Received 'LEASE_OK'."); |
259 |
#$kernel->yield( 'renew_lease' ); |
260 |
|
261 |
# 1. otherwise dump anything sent to us for debugging purposes |
262 |
# 2. destroy lease in any case on unknown payload |
263 |
} else { |
264 |
#print Dumper($payload); |
265 |
$heap->{'destroy lease'} = 1; |
266 |
#$kernel->alarm_remove_all(); |
267 |
|
268 |
} |
269 |
|
270 |
}; |
271 |
|
272 |
sub register_lease { |
273 |
my ( $self, $kernel, $heap ) = @_[ OBJECT, KERNEL, HEAP ]; |
274 |
$self->debug("register_lease"); |
275 |
|
276 |
my $ONE_arg = "Hello World!"; |
277 |
|
278 |
# V1 - without subscription |
279 |
#$kernel->post('IKC', 'post', "poe://LookupService/ServiceRegistrar/register_lease", $ONE_arg); |
280 |
# V2 - with subscription |
281 |
$kernel->post( "poe://LookupService/ServiceRegistrar", "register_lease", $ONE_arg ); |
282 |
} |
283 |
|
284 |
sub renew_lease { |
285 |
my ( $self, $kernel, $heap ) = @_[ OBJECT, KERNEL, HEAP ]; |
286 |
|
287 |
if ($heap->{'destroy lease'}) { |
288 |
#$heap->{'destroy lease'} = 0; |
289 |
#$kernel->delay_set('remote_timeout'); |
290 |
$self->debug("destroyed lease"); |
291 |
#undef $self; |
292 |
#$kernel->alias_remove('DeviceClient'); |
293 |
#undef $_[SESSION]; |
294 |
#$kernel->post( 'IKC' => 'shutdown' ); |
295 |
# clear delayed posts |
296 |
#$kernel->delay('renew_lease'); |
297 |
#$kernel->delay('remote_timeout'); |
298 |
return; |
299 |
} |
300 |
|
301 |
$self->debug("renew_lease"); |
302 |
|
303 |
# check if remote kernel(s) are still around |
304 |
#$kernel->post('IKC', 'call', 'poe://LookupService/IKC/ping', '', 'poe:remote_timeout'); |
305 |
#$kernel->post('IKC', 'call', 'poe://LookupService/IKC/ping', undef, 'poe:remote_timeout'); |
306 |
#$kernel->post('poe://remote/IKC', 'ping', 'poe:remote_timeout'); |
307 |
#$kernel->delay('remote_timeout', 5); # timeout |
308 |
|
309 |
my $ONE_arg = ''; |
310 |
#$kernel->post('IKC', 'post', "poe://LookupService/ServiceRegistrar/renew_lease", $ONE_arg); |
311 |
# V1 - without subscription |
312 |
$kernel->post('IKC', 'call', "poe://LookupService/ServiceRegistrar/renew_lease", $ONE_arg, 'poe:on_response'); |
313 |
|
314 |
# V2 - with subscription |
315 |
#my $resp = $kernel->call( "poe://LookupService/ServiceRegistrar", "renew_lease", $ONE_arg); |
316 |
#print $resp, "\n"; |
317 |
|
318 |
# V3 - have we been able to post? |
319 |
#my $resp = $kernel->call('IKC', 'call', "poe://LookupService/ServiceRegistrar/renew_lease", $ONE_arg, 'poe:response'); |
320 |
#print "resp: $resp", "\n"; |
321 |
|
322 |
# and again... |
323 |
$kernel->delay('renew_lease', 5); |
324 |
#$kernel->delay_set('renew_lease', 15); |
325 |
#$kernel->delay_add('renew_lease', 15); |
326 |
|
327 |
# timeout!? |
328 |
#$kernel->delay('remote_timeout', 20); |
329 |
$kernel->delay_add('remote_timeout', 7); |
330 |
#$kernel->delay_set('remote_timeout', 5); |
331 |
#$kernel->delay_set('remote_timeout', 20); |
332 |
|
333 |
} |
334 |
|
335 |
sub remote_shutdown { |
336 |
my ( $self, $kernel, $heap ) = @_[ OBJECT, KERNEL, HEAP ]; |
337 |
$self->debug("remote_shutdown"); |
338 |
} |
339 |
|
340 |
sub remote_timeout { |
341 |
|
342 |
#my ($pong) = $_[ARG0]; |
343 |
#return if $pong; # all is cool |
344 |
|
345 |
my ($self, $kernel, $heap) = @_[OBJECT, KERNEL, HEAP]; |
346 |
|
347 |
#=pod |
348 |
if ($heap->{'cancel timeout'}) { |
349 |
$heap->{'cancel timeout'} = 0; |
350 |
return; |
351 |
} |
352 |
#=cut |
353 |
|
354 |
$self->debug("remote_timeout"); |
355 |
|
356 |
$heap->{'destroy lease'} = 1; |
357 |
|
358 |
# YOW! Remote kernel timed out. RUN AROUND SCREAMING! |
359 |
print STDERR "# YOW! Remote kernel timed out. RUN AROUND SCREAMING!", "\n"; |
360 |
|
361 |
# free all resources that keep this session running |
362 |
$kernel->delay('renew_lease'); |
363 |
$kernel->delay('remote_timeout'); |
364 |
|
365 |
#$kernel->post( 'IKC' => 'shutdown' ); |
366 |
|
367 |
#$kernel->alias_remove('DeviceClient'); |
368 |
|
369 |
#$kernel->alias_remove('DeviceClient'); |
370 |
#$kernel->yield('renew_lease'); |
371 |
|
372 |
#sub POE::Component::IKC::Responder::DEBUG { return 1; } |
373 |
#$kernel->post( 'IKC' => 'unregister' ); |
374 |
|
375 |
#print Dumper($kernel->alias_list()); |
376 |
|
377 |
$kernel->post( IKC => 'retract', 'DeviceClient' => [qw( on_response )]); |
378 |
#$kernel->post( IKC => 'retract', 'me' => [qw( on_response )]); |
379 |
$kernel->post( IKC => 'unsubscribe', [qw( poe://LookupService/ServiceRegistrar )]); |
380 |
$kernel->post( IKC => 'unregister', [qw( poe://LookupService )]); |
381 |
#$kernel->post( IKC => 'unsubscribe', [qw( poe://me )]); |
382 |
#$kernel->post( IKC => 'unregister', [qw( poe://me )]); |
383 |
#$kernel->run_one_timeslice(); |
384 |
#$kernel->run_one_timeslice(); |
385 |
#$kernel->run_one_timeslice(); |
386 |
#return; |
387 |
|
388 |
#$kernel->post( 'IKC' => 'shutdown' ); |
389 |
#$kernel->post( 'IKC' => 'blah' ); |
390 |
#$kernel->run_one_timeslice(); |
391 |
#$kernel->run_one_timeslice(); |
392 |
|
393 |
$kernel->post('DeviceClient', 'stop'); |
394 |
|
395 |
$kernel->alias_remove('DeviceClient'); |
396 |
$kernel->alias_remove('IKC'); |
397 |
|
398 |
#$kernel->run_one_timeslice(); |
399 |
#$kernel->run_one_timeslice(); |
400 |
|
401 |
#$kernel->yield('_start'); |
402 |
|
403 |
} |
404 |
|
405 |
1; |
406 |
__END__ |