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1 | #! @PYTHON@ |
2 | ### -*-python-*- | |
3 | ### | |
4 | ### Watch arrival and departure of peers | |
5 | ### | |
6 | ### (c) 2007 Straylight/Edgeware | |
7 | ### | |
8 | ||
9 | ###----- Licensing notice --------------------------------------------------- | |
10 | ### | |
11 | ### This file is part of Trivial IP Encryption (TrIPE). | |
12 | ### | |
13 | ### TrIPE is free software; you can redistribute it and/or modify | |
14 | ### it under the terms of the GNU General Public License as published by | |
15 | ### the Free Software Foundation; either version 2 of the License, or | |
16 | ### (at your option) any later version. | |
17 | ### | |
18 | ### TrIPE is distributed in the hope that it will be useful, | |
19 | ### but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | ### GNU General Public License for more details. | |
22 | ### | |
23 | ### You should have received a copy of the GNU General Public License | |
24 | ### along with TrIPE; if not, write to the Free Software Foundation, | |
25 | ### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
26 | ||
27 | VERSION = '@VERSION@' | |
28 | ||
29 | ###-------------------------------------------------------------------------- | |
30 | ### External dependencies. | |
31 | ||
32 | from optparse import OptionParser | |
33 | import tripe as T | |
34 | import os as OS | |
35 | import signal as SIG | |
36 | import errno as E | |
37 | import cdb as CDB | |
38 | import mLib as M | |
39 | import re as RX | |
40 | from time import time | |
41 | import subprocess as PROC | |
42 | ||
43 | S = T.svcmgr | |
44 | ||
45 | ###-------------------------------------------------------------------------- | |
46 | ### Running auxiliary commands. | |
47 | ||
48 | class SelLineQueue (M.SelLineBuffer): | |
49 | """Glues the select-line-buffer into the coroutine queue system.""" | |
50 | ||
51 | def __new__(cls, file, queue, tag, kind): | |
52 | """See __init__ for documentation.""" | |
53 | return M.SelLineBuffer.__new__(cls, file.fileno()) | |
54 | ||
55 | def __init__(me, file, queue, tag, kind): | |
56 | """ | |
57 | Initialize a new line-reading adaptor. | |
58 | ||
59 | The adaptor reads lines from FILE. Each line is inserted as a message of | |
60 | the stated KIND, bearing the TAG, into the QUEUE. End-of-file is | |
61 | represented as None. | |
62 | """ | |
63 | me._q = queue | |
64 | me._file = file | |
65 | me._tag = tag | |
66 | me._kind = kind | |
67 | me.enable() | |
68 | ||
69 | @T._callback | |
70 | def line(me, line): | |
71 | me._q.put((me._tag, me._kind, line)) | |
72 | ||
73 | @T._callback | |
74 | def eof(me): | |
75 | me.disable() | |
76 | me._q.put((me._tag, me._kind, None)) | |
77 | ||
78 | class ErrorWatch (T.Coroutine): | |
79 | """ | |
80 | An object which watches stderr streams for errors and converts them into | |
81 | warnings of the form | |
82 | ||
83 | WARN watch INFO stderr LINE | |
84 | ||
85 | The INFO is a list of tokens associated with the file when it was | |
86 | registered. | |
87 | ||
88 | Usually there is a single ErrorWatch object, called errorwatch. | |
89 | """ | |
90 | ||
91 | def __init__(me): | |
92 | """Initialization: there are no arguments.""" | |
93 | T.Coroutine.__init__(me) | |
94 | me._q = T.Queue() | |
95 | me._map = {} | |
96 | me._seq = 1 | |
97 | ||
98 | def watch(me, file, info): | |
99 | """ | |
100 | Adds FILE to the collection of files to watch. | |
101 | ||
102 | INFO will be written in the warning messages from this FILE. Returns a | |
103 | sequence number which can be used to unregister the file again. | |
104 | """ | |
105 | seq = me._seq | |
106 | me._seq += 1 | |
107 | me._map[seq] = info, SelLineQueue(file, me._q, seq, 'stderr') | |
108 | return seq | |
109 | ||
110 | def unwatch(me, seq): | |
111 | """Stop watching the file with sequence number SEQ.""" | |
112 | del me._map[seq] | |
113 | return me | |
114 | ||
115 | def run(me): | |
116 | """ | |
117 | Coroutine function: read items from the queue and report them. | |
118 | ||
119 | Unregisters files automatically when they reach EOF. | |
120 | """ | |
121 | while True: | |
122 | seq, _, line = me._q.get() | |
123 | if line is None: | |
124 | me.unwatch(seq) | |
125 | else: | |
126 | S.warn(*['watch'] + me._map[seq][0] + ['stderr', line]) | |
127 | ||
128 | def dbwatch(): | |
129 | """ | |
130 | Coroutine function: wake up every second and notice changes to the | |
131 | database. When a change happens, tell the Pinger (q.v.) to rescan its | |
132 | peers. | |
133 | """ | |
134 | cr = T.Coroutine.getcurrent() | |
135 | main = cr.parent | |
136 | fw = M.FWatch(opts.cdb) | |
137 | while True: | |
138 | timer = M.SelTimer(time() + 1, lambda: cr.switch()) | |
139 | main.switch() | |
140 | if fw.update(): | |
141 | pinger.rescan(False) | |
142 | S.notify('watch', 'peerdb-update') | |
143 | ||
144 | class ChildWatch (M.SelSignal): | |
145 | """ | |
146 | An object which watches for specified processes exiting and reports | |
147 | terminations by writing items of the form (TAG, 'exit', RESULT) to a queue. | |
148 | ||
149 | There is usually only one ChildWatch object, called childwatch. | |
150 | """ | |
151 | ||
152 | def __new__(cls): | |
153 | """Initialize the child-watcher.""" | |
154 | return M.SelSignal.__new__(cls, SIG.SIGCHLD) | |
155 | ||
156 | def __init__(me): | |
157 | """Initialize the child-watcher.""" | |
158 | me._pid = {} | |
159 | me.enable() | |
160 | ||
161 | def watch(me, pid, queue, tag): | |
162 | """ | |
163 | Register PID as a child to watch. If it exits, write (TAG, 'exit', CODE) | |
164 | to the QUEUE, where CODE is one of | |
165 | ||
166 | * None (successful termination) | |
167 | * ['exit-nonzero', CODE] (CODE is a string!) | |
168 | * ['exit-signal', 'S' + CODE] (CODE is the signal number as a string) | |
169 | * ['exit-unknown', STATUS] (STATUS is the entire exit status, in hex) | |
170 | """ | |
171 | me._pid[pid] = queue, tag | |
172 | return me | |
173 | ||
174 | def unwatch(me, pid): | |
175 | """Unregister PID as a child to watch.""" | |
176 | del me._pid[pid] | |
177 | return me | |
178 | ||
179 | @T._callback | |
180 | def signalled(me): | |
181 | """ | |
182 | Called when child processes exit: collect exit statuses and report | |
183 | failures. | |
184 | """ | |
185 | while True: | |
186 | try: | |
187 | pid, status = OS.waitpid(-1, OS.WNOHANG) | |
188 | except OSError, exc: | |
189 | if exc.errno == E.ECHILD: | |
190 | break | |
191 | if pid == 0: | |
192 | break | |
193 | if pid not in me._pid: | |
194 | continue | |
195 | queue, tag = me._pid[pid] | |
196 | if OS.WIFEXITED(status): | |
197 | exit = OS.WEXITSTATUS(status) | |
198 | if exit == 0: | |
199 | code = None | |
200 | else: | |
201 | code = ['exit-nonzero', str(exit)] | |
202 | elif OS.WIFSIGNALED(status): | |
203 | code = ['exit-signal', 'S' + str(OS.WTERMSIG(status))] | |
204 | else: | |
205 | code = ['exit-unknown', hex(status)] | |
206 | queue.put((tag, 'exit', code)) | |
207 | ||
208 | class Command (object): | |
209 | """ | |
210 | Represents a running command. | |
211 | ||
212 | This class is the main interface to the machery provided by the ChildWatch | |
213 | and ErrorWatch objects. See also potwatch. | |
214 | """ | |
215 | ||
216 | def __init__(me, info, queue, tag, args, env): | |
217 | """ | |
218 | Start a new child process. | |
219 | ||
220 | The ARGS are a list of arguments to be given to the child process. The | |
221 | ENV is either None or a dictionary of environment variable assignments to | |
222 | override the extant environment. INFO is a list of tokens to be included | |
223 | in warnings about the child's stderr output. If the child writes a line | |
224 | to standard output, put (TAG, 'stdout', LINE) to the QUEUE. When the | |
225 | child exits, write (TAG, 'exit', CODE) to the QUEUE. | |
226 | """ | |
227 | me._info = info | |
228 | me._q = queue | |
229 | me._tag = tag | |
230 | myenv = OS.environ.copy() | |
231 | if env: myenv.update(env) | |
232 | me._proc = PROC.Popen(args = args, env = myenv, bufsize = 1, | |
233 | stdout = PROC.PIPE, stderr = PROC.PIPE) | |
234 | me._lq = SelLineQueue(me._proc.stdout, queue, tag, 'stdout') | |
235 | errorwatch.watch(me._proc.stderr, info) | |
236 | childwatch.watch(me._proc.pid, queue, tag) | |
237 | ||
238 | def __del__(me): | |
239 | """ | |
240 | If I've been forgotten then stop watching for termination. | |
241 | """ | |
242 | childwatch.unwatch(me._proc.pid) | |
243 | ||
244 | def potwatch(what, name, q): | |
245 | """ | |
246 | Watch the queue Q for activity as reported by a Command object. | |
247 | ||
248 | Information from the process's stdout is reported as | |
249 | ||
250 | NOTE WHAT NAME stdout LINE | |
251 | ||
252 | abnormal termination is reported as | |
253 | ||
254 | WARN WHAT NAME CODE | |
255 | ||
256 | where CODE is what the ChildWatch wrote. | |
257 | """ | |
258 | eofp = deadp = False | |
259 | while not deadp or not eofp: | |
260 | _, kind, more = q.get() | |
261 | if kind == 'stdout': | |
262 | if more is None: | |
263 | eofp = True | |
264 | else: | |
265 | S.notify('watch', what, name, 'stdout', more) | |
266 | elif kind == 'exit': | |
267 | if more: S.warn('watch', what, name, *more) | |
268 | deadp = True | |
269 | ||
270 | ###-------------------------------------------------------------------------- | |
271 | ### Peer database utilities. | |
272 | ||
273 | def timespec(info, key, default): | |
274 | """Parse INFO[KEY] as a timespec, or return DEFAULT.""" | |
275 | try: | |
276 | return T.timespec(info[key]) | |
277 | except (KeyError, T.TripeJobError): | |
278 | return default | |
279 | ||
280 | def integer(info, key, default): | |
281 | """Parse INFO[KEY] as an integer, or return DEFAULT.""" | |
282 | try: | |
283 | return int(info[key]) | |
284 | except (KeyError, ValueError): | |
285 | return default | |
286 | ||
287 | def boolean(info, key, default): | |
288 | """Parse INFO[KEY] as a boolean, or return DEFAULT.""" | |
289 | try: | |
290 | return info[key] in ['t', 'true', 'y', 'yes', 'on'] | |
291 | except (KeyError, ValueError): | |
292 | return default | |
293 | ||
294 | def peerinfo(peer): | |
295 | """ | |
296 | Return a dictionary containing information about PEER from the database. | |
297 | """ | |
298 | return dict(M.URLDecode(CDB.init(opts.cdb)['P' + peer], semip = True)) | |
299 | ||
300 | ###-------------------------------------------------------------------------- | |
301 | ### Waking up and watching peers. | |
302 | ||
303 | def connect(peer, conn = None): | |
304 | """ | |
305 | Start the job of connecting to the passive PEER. | |
306 | ||
307 | The CONN string is a shell command which will connect to the peer (via some | |
308 | back-channel, say ssh and userv), issue a command | |
309 | ||
310 | SVCSUBMIT connect passive [OPTIONS] USER | |
311 | ||
312 | and write the resulting challenge to standard error. | |
313 | """ | |
314 | if conn is None: | |
315 | try: | |
316 | conn = peerinfo(peer)['connect'] | |
317 | except KeyError: | |
318 | return | |
319 | q = T.Queue() | |
320 | cmd = Command(['connect', peer], q, 'connect', | |
321 | ['/bin/sh', '-c', conn], None) | |
322 | _, kind, more = q.peek() | |
323 | if kind == 'stdout': | |
324 | if more is None: | |
325 | S.warn('watch', 'connect', peer, 'unexpected-eof') | |
326 | else: | |
327 | chal = more | |
328 | S.greet(peer, chal) | |
329 | q.get() | |
330 | potwatch('connect', peer, q) | |
331 | ||
332 | _pingseq = 0 | |
333 | class PingPeer (object): | |
334 | """ | |
335 | Object representing a peer which we are pinging to ensure that it is still | |
336 | present. | |
337 | ||
338 | PingPeer objects are held by the Pinger (q.v.). The Pinger maintains an | |
339 | event queue -- which saves us from having an enormous swarm of coroutines | |
340 | -- but most of the actual work is done here. | |
341 | ||
342 | In order to avoid confusion between different PingPeer instances for the | |
343 | same actual peer, each PingPeer has a sequence number (its `seq' | |
344 | attribute). Events for the PingPeer are identified by a (PEER, SEQ) pair. | |
345 | (Using the PingPeer instance itself will prevent garbage collection of | |
346 | otherwise defunct instances.) | |
347 | """ | |
348 | ||
349 | def __init__(me, pinger, queue, peer, info, pingnow): | |
350 | """ | |
351 | Create a new PingPeer. | |
352 | ||
353 | The PINGER is the Pinger object we should send the results to. This is | |
354 | used when we remove ourselves, if the peer has been explicitly removed. | |
355 | ||
356 | The QUEUE is the event queue on which timer and ping-command events | |
357 | should be written. | |
358 | ||
359 | The PEER is just the peer's name, as a string. | |
360 | ||
361 | The INFO is the database record for the peer, as a dictionary, or None if | |
362 | it's not readily available. (This is just a tweak to save multiple | |
363 | probes if we don't really need them.) | |
364 | ||
365 | If PINGNOW is true, then immediately start pinging the peer. Otherwise | |
366 | wait until the usual retry interval. | |
367 | """ | |
368 | global _pingseq | |
369 | me._pinger = pinger | |
370 | me._q = queue | |
371 | me._peer = peer | |
372 | me.update(info) | |
373 | me.seq = _pingseq | |
374 | _pingseq += 1 | |
375 | me._failures = 0 | |
376 | if pingnow: | |
377 | me._timer = None | |
378 | me._ping() | |
379 | else: | |
380 | me._timer = M.SelTimer(time() + me._every, me._time) | |
381 | ||
382 | def update(me, info): | |
383 | """ | |
384 | Refreshes the timer parameters for this peer. We don't, however, | |
385 | immediately reschedule anything: that will happen next time anything | |
386 | interesting happens. | |
387 | """ | |
388 | if info is None: | |
389 | info = peerinfo(me._peer) | |
390 | me._every = timespec(info, 'every', 120) | |
391 | me._timeout = timespec(info, 'timeout', 10) | |
392 | me._retries = integer(info, 'retries', 5) | |
393 | me._connectp = 'connect' in info | |
394 | return me | |
395 | ||
396 | def _ping(me): | |
397 | """ | |
398 | Send a ping to the peer; the result is sent to the Pinger's event queue. | |
399 | """ | |
400 | S.rawcommand(T.TripeAsynchronousCommand( | |
401 | me._q, (me._peer, me.seq), | |
402 | ['PING', | |
403 | '-background', S.bgtag(), | |
404 | '-timeout', str(me._timeout), | |
405 | '--', | |
406 | me._peer])) | |
407 | ||
408 | def event(me, code, stuff): | |
409 | """ | |
410 | Respond to an event which happened to this peer. | |
411 | ||
412 | Timer events indicate that we should start a new ping. (The server has | |
413 | its own timeout which detects lost packets.) | |
414 | ||
415 | We trap unknown-peer responses and detach from the Pinger. | |
416 | ||
417 | If the ping fails and we run out of retries, we attempt to restart the | |
418 | connection. | |
419 | """ | |
420 | if code == 'TIMER': | |
421 | me._failures = 0 | |
422 | me._ping() | |
423 | elif code == 'FAIL': | |
424 | S.notify('watch', 'ping-failed', me._peer, *stuff) | |
425 | if stuff and stuff[0] == 'unknown-peer': | |
426 | me._pinger.kill(me._peer) | |
427 | elif code == 'INFO': | |
428 | if stuff[0] == 'ping-ok': | |
429 | if me._failures > 0: | |
430 | S.warn('watch', 'ping-ok', me._peer) | |
431 | me._timer = M.SelTimer(time() + me._every, me._time) | |
432 | elif stuff[0] == 'ping-timeout': | |
433 | me._failures += 1 | |
434 | S.warn('watch', 'ping-timeout', me._peer, | |
435 | 'attempt', str(me._failures), 'of', str(me._retries)) | |
436 | if me._failures < me._retries: | |
437 | me._ping() | |
438 | else: | |
439 | info = peerinfo(me._peer) | |
440 | if 'connect' in info: | |
441 | S.warn('watch', 'reconnecting', me._peer) | |
442 | S.forcekx(me._peer) | |
443 | T.spawn(T.Coroutine(connect), me._peer) | |
444 | me._timer = M.SelTimer(time() + me._every, me._time) | |
445 | else: | |
446 | S.kill(me._peer) | |
447 | elif stuff[0] == 'ping-peer-died': | |
448 | me._pinger.kill(me._peer) | |
449 | ||
450 | @T._callback | |
451 | def _time(me): | |
452 | """ | |
453 | Handle timer callbacks by posting a timeout event on the queue. | |
454 | """ | |
455 | me._timer = None | |
456 | me._q.put(((me._peer, me.seq), 'TIMER', None)) | |
457 | ||
458 | def __str__(me): | |
459 | return 'PingPeer(%s, %d, f = %d)' % (me._peer, me.seq, me._failures) | |
460 | def __repr__(me): | |
461 | return str(me) | |
462 | ||
463 | class Pinger (T.Coroutine): | |
464 | """ | |
465 | The Pinger keeps track of the peers which we expect to be connected and | |
466 | takes action if they seem to stop responding. | |
467 | ||
468 | There is usually only one Pinger, called pinger. | |
469 | ||
470 | The Pinger maintains a collection of PingPeer objects, and an event queue. | |
471 | The PingPeers direct the results of their pings, and timer events, to the | |
472 | event queue. The Pinger's coroutine picks items off the queue and | |
473 | dispatches them back to the PingPeers as appropriate. | |
474 | """ | |
475 | ||
476 | def __init__(me): | |
477 | """Initialize the Pinger.""" | |
478 | T.Coroutine.__init__(me) | |
479 | me._peers = {} | |
480 | me._q = T.Queue() | |
481 | ||
482 | def run(me): | |
483 | """ | |
484 | Coroutine function: reads the pinger queue and sends events to the | |
485 | PingPeer objects they correspond to. | |
486 | """ | |
487 | while True: | |
488 | (peer, seq), code, stuff = me._q.get() | |
489 | if peer in me._peers and seq == me._peers[peer].seq: | |
490 | me._peers[peer].event(code, stuff) | |
491 | ||
492 | def add(me, peer, info, pingnow): | |
493 | """ | |
494 | Add PEER to the collection of peers under the Pinger's watchful eye. | |
495 | The arguments are as for PingPeer: see above. | |
496 | """ | |
497 | me._peers[peer] = PingPeer(me, me._q, peer, info, pingnow) | |
498 | return me | |
499 | ||
500 | def kill(me, peer): | |
501 | """Remove PEER from the peers being watched by the Pinger.""" | |
502 | del me._peers[peer] | |
503 | return me | |
504 | ||
505 | def rescan(me, startup): | |
506 | """ | |
507 | General resynchronization method. | |
508 | ||
509 | We scan the list of peers (with connect scripts) known at the server. | |
510 | Any which are known to the Pinger but aren't known to the server are | |
511 | removed from our list; newly arrived peers are added. (Note that a peer | |
512 | can change state here either due to the server sneakily changing its list | |
513 | without issuing notifications or, more likely, the database changing its | |
514 | idea of whether a peer is interesting.) Finally, PingPeers which are | |
515 | still present are prodded to update their timing parameters. | |
516 | ||
517 | This method is called once at startup to pick up the peers already | |
518 | installed, and again by the dbwatcher coroutine when it detects a change | |
519 | to the database. | |
520 | """ | |
521 | correct = {} | |
522 | for peer in S.list(): | |
523 | try: | |
524 | info = peerinfo(peer) | |
525 | except KeyError: | |
526 | continue | |
527 | if boolean(info, 'watch', False): | |
528 | correct[peer] = info | |
529 | for peer, obj in me._peers.items(): | |
530 | if peer in correct: | |
531 | obj.update(correct[peer]) | |
532 | else: | |
533 | del me._peers[peer] | |
534 | for peer, info in correct.iteritems(): | |
535 | if peer not in me._peers: | |
536 | if startup: | |
537 | ifname = S.ifname(peer) | |
538 | addr = S.addr(peer) | |
539 | addpeer(info, peer, ifname, *addr) | |
540 | else: | |
541 | me.add(peer, info, True) | |
542 | return me | |
543 | ||
544 | def adopted(me): | |
545 | """ | |
546 | Returns the list of peers being watched by the Pinger. | |
547 | """ | |
548 | return me._peers.keys() | |
549 | ||
550 | ###-------------------------------------------------------------------------- | |
551 | ### New connections. | |
552 | ||
553 | def encode_envvars(env, prefix, vars): | |
554 | """ | |
555 | Encode the variables in VARS suitably for including in a program | |
556 | environment. Lowercase letters in variable names are forced to uppercase; | |
557 | runs of non-alphanumeric characters are replaced by single underscores; and | |
558 | the PREFIX is prepended. The resulting variables are written to ENV. | |
559 | """ | |
560 | for k, v in vars.iteritems(): | |
561 | env[prefix + r_bad.sub('_', k.upper())] = v | |
562 | ||
563 | r_bad = RX.compile(r'[\W_]+') | |
564 | def envvars(info): | |
565 | """ | |
566 | Translate the database INFO dictionary for a peer into a dictionary of | |
567 | environment variables with plausible upper-case names and a P_ prefix. | |
568 | Also collect the crypto information into A_ variables. | |
569 | """ | |
570 | env = {} | |
571 | encode_envvars(env, 'P_', info) | |
572 | encode_envvars(env, 'A_', S.algs()) | |
573 | return env | |
574 | ||
575 | def ifupdown(what, peer, info, *args): | |
576 | """ | |
577 | Run the interface up/down script for a peer. | |
578 | ||
579 | WHAT is 'ifup' or 'ifdown'. PEER names the peer in question. INFO is the | |
580 | database record dictionary. ARGS is a list of arguments to pass to the | |
581 | script, in addition to the peer name. | |
582 | ||
583 | The command is run and watched in the background by potwatch. | |
584 | """ | |
585 | q = T.Queue() | |
586 | c = Command([what, peer], q, what, | |
587 | M.split(info[what], quotep = True)[0] + | |
588 | [peer] + list(args), | |
589 | envvars(info)) | |
590 | potwatch(what, peer, q) | |
591 | ||
592 | def addpeer(info, peer, ifname, *addr): | |
593 | """ | |
594 | Add a new peer to our collection. | |
595 | ||
596 | INFO is the peer information dictionary, or None if we don't have one yet. | |
597 | ||
598 | PEER names the peer; IFNAME is the interface name for its tunnel; and ADDR | |
599 | is the list of tokens representing its address. | |
600 | ||
601 | We try to bring up the interface and provoke a connection to the peer if | |
602 | it's passive. | |
603 | """ | |
604 | if info is None: | |
605 | try: | |
606 | info = peerinfo(peer) | |
607 | except KeyError: | |
608 | return | |
609 | if 'ifup' in info: | |
610 | T.Coroutine(ifupdown).switch('ifup', peer, info, ifname, *addr) | |
611 | if 'connect' in info: | |
612 | T.Coroutine(connect).switch(peer, info['connect']) | |
613 | if boolean(info, 'watch', False): | |
614 | pinger.add(peer, info, False) | |
615 | ||
616 | def delpeer(peer): | |
617 | """Drop the PEER from the Pinger and put its interface to bed.""" | |
618 | try: | |
619 | info = peerinfo(peer) | |
620 | except KeyError: | |
621 | return | |
622 | try: | |
623 | pinger.kill(peer) | |
624 | except KeyError: | |
625 | pass | |
626 | if 'ifdown' in info: | |
627 | T.Coroutine(ifupdown).switch('ifdown', peer, info) | |
628 | ||
629 | def notify(_, code, *rest): | |
630 | """ | |
631 | Watch for notifications. | |
632 | ||
633 | We trap ADD and KILL notifications, and send them straight to addpeer and | |
634 | delpeer respectively. | |
635 | """ | |
636 | if code == 'ADD': | |
637 | addpeer(None, *rest) | |
638 | elif code == 'KILL': | |
639 | delpeer(*rest) | |
640 | ||
641 | ###-------------------------------------------------------------------------- | |
642 | ### Command stubs. | |
643 | ||
644 | def cmd_stub(*args): | |
645 | raise T.TripeJobError('not-implemented') | |
646 | ||
647 | def cmd_kick(peer): | |
648 | """ | |
649 | kick PEER: Force a new connection attempt for PEER | |
650 | """ | |
651 | if peer not in pinger.adopted(): | |
652 | raise T.TripeJobError('peer-not-adopted', peer) | |
653 | T.spawn(T.Coroutine(connect), peer) | |
654 | ||
655 | def cmd_adopted(): | |
656 | """ | |
657 | adopted: Report a list of adopted peers. | |
658 | """ | |
659 | for peer in pinger.adopted(): | |
660 | T.svcinfo(peer) | |
661 | ||
662 | ###-------------------------------------------------------------------------- | |
663 | ### Start up. | |
664 | ||
665 | def setup(): | |
666 | """ | |
667 | Service setup. | |
668 | ||
669 | Register the notification watcher, and rescan the peers. | |
670 | """ | |
671 | S.handler['NOTE'] = notify | |
672 | S.watch('+n') | |
673 | pinger.rescan(opts.startup) | |
674 | ||
675 | def init(): | |
676 | """ | |
677 | Initialization to be done before service startup. | |
678 | """ | |
679 | global errorwatch, childwatch, pinger | |
680 | errorwatch = ErrorWatch() | |
681 | childwatch = ChildWatch() | |
682 | pinger = Pinger() | |
683 | T.Coroutine(dbwatch).switch() | |
684 | errorwatch.switch() | |
685 | pinger.switch() | |
686 | ||
687 | def parse_options(): | |
688 | """ | |
689 | Parse the command-line options. | |
690 | ||
691 | Automatically changes directory to the requested configdir, and turns on | |
692 | debugging. Returns the options object. | |
693 | """ | |
694 | op = OptionParser(usage = '%prog [-a FILE] [-d DIR]', | |
695 | version = '%%prog %s' % VERSION) | |
696 | ||
697 | op.add_option('-a', '--admin-socket', | |
698 | metavar = 'FILE', dest = 'tripesock', default = T.tripesock, | |
699 | help = 'Select socket to connect to [default %default]') | |
700 | op.add_option('-d', '--directory', | |
701 | metavar = 'DIR', dest = 'dir', default = T.configdir, | |
702 | help = 'Select current diretory [default %default]') | |
703 | op.add_option('-p', '--peerdb', | |
704 | metavar = 'FILE', dest = 'cdb', default = T.peerdb, | |
705 | help = 'Select peers database [default %default]') | |
706 | op.add_option('--daemon', dest = 'daemon', | |
707 | default = False, action = 'store_true', | |
708 | help = 'Become a daemon after successful initialization') | |
709 | op.add_option('--debug', dest = 'debug', | |
710 | default = False, action = 'store_true', | |
711 | help = 'Emit debugging trace information') | |
712 | op.add_option('--startup', dest = 'startup', | |
713 | default = False, action = 'store_true', | |
714 | help = 'Being called as part of the server startup') | |
715 | ||
716 | opts, args = op.parse_args() | |
717 | if args: op.error('no arguments permitted') | |
718 | OS.chdir(opts.dir) | |
719 | T._debug = opts.debug | |
720 | return opts | |
721 | ||
722 | ## Service table, for running manually. | |
723 | service_info = [('watch', T.VERSION, { | |
724 | 'adopted': (0, 0, '', cmd_adopted), | |
725 | 'kick': (1, 1, 'PEER', cmd_kick) | |
726 | })] | |
727 | ||
728 | if __name__ == '__main__': | |
729 | opts = parse_options() | |
730 | T.runservices(opts.tripesock, service_info, | |
731 | init = init, setup = setup, | |
732 | daemon = opts.daemon) | |
733 | ||
734 | ###----- That's all, folks -------------------------------------------------- |