3 ### Administration connection with tripe server
5 ### (c) 2006 Straylight/Edgeware
8 ###----- Licensing notice ---------------------------------------------------
10 ### This file is part of Trivial IP Encryption (TrIPE).
12 ### TrIPE is free software; you can redistribute it and/or modify
13 ### it under the terms of the GNU General Public License as published by
14 ### the Free Software Foundation; either version 2 of the License, or
15 ### (at your option) any later version.
17 ### TrIPE is distributed in the hope that it will be useful,
18 ### but WITHOUT ANY WARRANTY; without even the implied warranty of
19 ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 ### GNU General Public License for more details.
22 ### You should have received a copy of the GNU General Public License
23 ### along with TrIPE; if not, write to the Free Software Foundation,
24 ### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 This module provides classes and functions for connecting to a running tripe
28 server, sending it commands, receiving and processing replies, and
29 implementing services.
31 Rather than end up in lost in a storm of little event-driven classes, or a
32 morass of concurrent threads, the module uses coroutines to present a fairly
33 simple function call/return interface to potentially long-running commands
34 which must run without blocking the main process. It sassumes a coroutine
35 module presenting a subset of the `greenlet' interface: if actual greenlets
36 are available, they are used; otherwise there's an implementation in terms of
37 threads (with lots of locking) which will do instead.
39 The simple rule governing the coroutines used here is this:
41 * The root coroutine never cares what values are passed to it when it
42 resumes: it just discards them.
44 * Other, non-root, coroutines are presumed to be waiting for some specific
47 Configuration variables:
55 Other useful variables:
79 TripeSynchronousCommand
80 TripeAsynchronousCommand
83 TripeCommandDispatcher
97 __pychecker__ = 'self=me no-constCond no-argsused'
101 ###--------------------------------------------------------------------------
102 ### External dependencies.
112 if OS.getenv('TRIPE_FORCE_RMCR') is not None:
114 from py.magic import greenlet as _Coroutine
116 from rmcr import Coroutine as _Coroutine
118 ###--------------------------------------------------------------------------
119 ### Coroutine hacking.
121 rootcr = _Coroutine.getcurrent()
123 class Coroutine (_Coroutine):
125 A coroutine class which can only be invoked by the root coroutine.
127 The root, by construction, cannot be an instance of this class.
129 def switch(me, *args, **kw):
130 assert _Coroutine.getcurrent() is rootcr
131 _Coroutine.switch(me, *args, **kw)
133 ###--------------------------------------------------------------------------
134 ### Default places for things.
136 configdir = OS.environ.get('TRIPEDIR', "@configdir@")
137 socketdir = "@socketdir@"
138 PACKAGE = "@PACKAGE@"
139 VERSION = "@VERSION@"
141 tripesock = OS.environ.get('TRIPESOCK', OS.path.join(socketdir, 'tripesock'))
143 ###--------------------------------------------------------------------------
144 ### Connection to the server.
146 def readnonblockingly(sock, len):
148 Nonblocking read from SOCK.
150 Try to return LEN bytes. If couldn't read anything, return None. EOF is
151 returned as an empty string.
155 return sock.recv(len)
157 if exc[0] == E.EWOULDBLOCK:
161 class TripeConnectionError (StandardError):
162 """Something happened to the connection with the server."""
164 class TripeInternalError (StandardError):
165 """This program is very confused."""
168 class TripeConnection (object):
170 A logical connection to the tripe administration socket.
172 There may or may not be a physical connection. (This is needed for the
173 monitor, for example.)
175 This class isn't very useful on its own, but it has useful subclasses. At
176 this level, the class is agnostic about I/O multiplexing schemes; that gets
180 def __init__(me, socket):
182 Make a connection to the named SOCKET.
184 No physical connection is made initially.
192 Ensure that there's a physical connection.
194 Do nothing if we're already connected. Invoke the `connected' method if
198 sock = S.socket(S.AF_UNIX, S.SOCK_STREAM)
199 sock.connect(me.socket)
201 me.lbuf = M.LineBuffer(me.line, me._eof)
206 def disconnect(me, reason):
208 Disconnect the physical connection.
210 Invoke the `disconnected' method, giving the provided REASON, which
211 should be either None or an exception.
213 if not me.sock: return
214 me.disconnected(reason)
223 Return true if there's a current, believed-good physical connection.
225 return me.sock is not None
227 __nonzero__ = connectedp
231 Send the LINE to the connection's socket.
233 All output is done through this method; it can be overridden to provide
234 proper nonblocking writing, though this seems generally unnecessary.
237 me.sock.setblocking(1)
238 me.sock.send(line + '\n')
239 except Exception, exc:
246 Receive whatever's ready from the connection's socket.
248 Call `line' on each complete line, and `eof' if the connection closed.
249 Subclasses which attach this class to an I/O-event system should call
250 this method when the socket (CONN.sock) is ready for reading.
252 while me.sock is not None:
254 buf = readnonblockingly(me.sock, 16384)
255 except Exception, exc:
267 """Internal end-of-file handler."""
268 me.disconnect(TripeConnectionError('connection lost'))
273 To be overridden by subclasses to react to a connection being
278 def disconnected(me, reason):
280 To be overridden by subclasses to react to a connection being severed.
285 """To be overridden by subclasses to handle end-of-file."""
289 """To be overridden by subclasses to handle incoming lines."""
292 ###--------------------------------------------------------------------------
293 ### Dispatching coroutine.
295 ## Match a string if it can stand on its own as a bareword: i.e., it doesn't
296 ## contain backslashes, quotes or whitespace.
297 rx_ordinary = RX.compile(r'^[^\\\'\"\s]+$')
299 ## Match characters which need to be escaped, even in quoted text.
300 rx_weird = RX.compile(r'([\\\'])')
303 """Quote S according to the tripe-admin(5) rules."""
304 m = rx_ordinary.match(s)
305 if m and m.end() == len(s):
308 return "'" + rx_weird.sub(r'\\\1', s) + "'"
312 Return a wrapper for FUNC which reports exceptions thrown by it.
314 Useful in the case of callbacks invoked by C functions which ignore
319 return func(*a, **kw)
321 SYS.excepthook(*SYS.exc_info())
325 class TripeCommand (object):
327 This abstract class represents a command in progress.
329 The `words' attribute contains the list of tokens which make up the
332 Subclasses must implement a method to handle server responses:
334 * response(CODE, *ARGS): CODE is one of the strings 'OK', 'INFO' or
335 'FAIL'; ARGS are the remaining tokens from the server's response.
338 def __init__(me, words):
339 """Make a new command consisting of the given list of WORDS."""
342 class TripeSynchronousCommand (TripeCommand):
344 A simple command, processed apparently synchronously.
346 Must be invoked from a coroutine other than the root (or whichever one is
347 running the dispatcher); in reality, other coroutines carry on running
348 while we wait for a response from the server.
350 Each server response causes the calling coroutine to be resumed with the
351 pair (CODE, REST) -- where CODE is the server's response code (`OK', `INFO'
352 or `FAIL') and REST is a list of the server's other response tokens. The
353 calling coroutine must continue switching back to the dispatcher until a
354 terminating response (`OK' or `FAIL') is received or become very
357 Mostly it's better to use the TripeCommandIterator to do this
361 def __init__(me, words):
362 """Initialize the command, specifying the WORDS to send to the server."""
363 TripeCommand.__init__(me, words)
364 me.owner = Coroutine.getcurrent()
366 def response(me, code, *rest):
367 """Handle a server response by forwarding it to the calling coroutine."""
368 me.owner.switch((code, rest))
370 class TripeError (StandardError):
372 A tripe command failed with an error (a FAIL code). The args attribute
373 contains a list of the server's message tokens.
377 class TripeCommandIterator (object):
379 Iterator interface to a tripe command.
381 The values returned by the iterator are lists of tokens from the server's
382 INFO lines, as processed by the given filter function, if any. The
383 iterator completes normally (by raising StopIteration) if the server
384 reported OK, and raises an exception if the command failed for some reason.
386 A TripeError is raised if the server issues a FAIL code. If the connection
387 failed, some other exception is raised.
390 def __init__(me, dispatcher, words, bg = False, filter = None):
392 Create a new command iterator.
394 The command is submitted to the DISPATCHER; it consists of the given
395 WORDS. If BG is true, then an option is inserted to request that the
396 server run the command in the background. The FILTER is applied to the
397 token lists which the server responds, and the filter's output are the
398 items returned by the iterator.
400 me.dcr = Coroutine.getcurrent().parent
402 raise ValueError, 'must invoke from coroutine'
403 me.filter = filter or (lambda x: x)
405 words = [words[0], '-background', dispatcher.bgtag()] + list(words[1:])
406 dispatcher.rawcommand(TripeSynchronousCommand(words))
409 """Iterator protocol: I am my own iterator."""
414 Iterator protocol: return the next piece of information from the server.
416 INFO responses are filtered and returned as the values of the iteration.
417 FAIL and CONNERR responses are turned into exceptions and raised.
418 Finally, OK is turned into StopIteration, which should cause a normal end
419 to the iteration process.
421 thing = me.dcr.switch()
424 return me.filter(rest)
427 elif code == 'CONNERR':
429 raise TripeConnectionError, 'connection terminated by user'
433 raise TripeError(*rest)
435 raise TripeInternalError \
436 ('unexpected tripe response %r' % ([code] + rest))
438 ### Simple utility functions for the TripeCommandIterator convenience
441 def _tokenjoin(words):
442 """Filter function: simply join the given tokens with spaces between."""
443 return ' '.join(words)
446 """Return a dictionary formed from the KEY=VALUE pairs returned by the
452 kv[w[:q]] = w[q + 1:]
456 """Raise an error if ITER contains any item."""
459 raise TripeInternalError('expected no response')
463 """If ITER contains a single item, return it; otherwise raise an error."""
466 raise TripeInternalError('expected only one line of response')
469 def _tracelike(iter):
470 """Handle a TRACE-like command. The result is a list of tuples (CHAR,
471 STATUS, DESC): CHAR is a selector character, STATUS is the status (empty if
472 disabled, `+' if enabled, maybe something else later), and DESC is the
473 human-readable description."""
478 desc = ' '.join(ww[1:])
479 stuff.append((ch, st, desc))
482 def _kwopts(kw, allowed):
483 """Parse keyword arguments into options. ALLOWED is a list of allowable
484 keywords; raise errors if other keywords are present. KEY = VALUE becomes
485 an option pair -KEY VALUE if VALUE is a string, just the option -KEY if
486 VALUE is a true non-string, or nothing if VALUE is false.. Insert a `--'
487 at the end to stop the parser getting confused."""
490 for a in allowed: amap[a] = True
491 for k, v in kw.iteritems():
493 raise ValueError('option %s not allowed here' % k)
494 if isinstance(v, str):
501 class TripeCommandDispatcher (TripeConnection):
505 The command dispatcher is a connection which knows how to handle commands.
506 This is probably the most important class in this module to understand.
508 Lines from the server are parsed into tokens. The first token is a code
509 (OK or NOTE or something) explaining what kind of line this is. The
510 `handler' attribute is a dictionary mapping server line codes to handler
511 functions, which are applied to the words of the line as individual
512 arguments. *Exception*: the content of TRACE lines is not tokenized.
514 There are default handlers for server codes which respond to commands.
515 Commands arrive as TripeCommand instances through the `rawcommand'
516 interface. The dispatcher keeps track of which command objects represent
517 which jobs, and sends responses on to the appropriate command objects by
518 invoking their `response' methods. Command objects don't see the
519 BG... codes, because the dispatcher has already transformed them into
520 regular codes when it was looking up job code.
522 The dispatcher also has a special response code of its own: CONNERR
523 indicates that the connection failed and the command has therefore been
527 ## --- Infrastructure ---
529 ## We will get confused if we pipeline commands. Send them one at a time.
530 ## Only send a command when the previous one detaches or completes.
532 ## The following attributes are interesting:
534 ## tagseq Sequence number for next background job (for bgtag)
536 ## queue Commands awaiting submission.
538 ## cmd Mapping from job tags to commands: cmd[None] is the
539 ## foreground command.
541 ## handler Mapping from server codes to handler functions.
543 def __init__(me, socket):
545 Initialize the dispatcher.
547 The SOCKET is the filename of the administration socket to connect to,
548 for TripeConnection.__init__.
550 TripeConnection.__init__(me, socket)
553 me.handler['BGDETACH'] = me._detach
554 for i in 'BGOK', 'BGINFO', 'BGFAIL':
555 me.handler[i] = me._response
556 for i in 'OK', 'INFO', 'FAIL':
557 me.handler[i] = me._fgresponse
563 If a subclass overrides this method, it must call us; clears out the
564 command queue and job map.
569 def disconnected(me, reason):
573 If a subclass hooks overrides this method, it must call us; sends a
574 special CONNERR code to all incomplete commands.
576 for cmd in me.cmd.itervalues():
577 cmd.response('CONNERR', reason)
579 cmd.response('CONNERR', reason)
583 """Handle an incoming line, sending it to the right place."""
584 if _debug: print '<', line
585 code, rest = M.word(line, quotep = True)
586 func = me.handler.get(code)
591 func(code, *M.split(rest, quotep = True)[0])
596 Pull the oldest command off the queue and try to send it to the server.
598 if not me.queue or None in me.cmd: return
599 cmd = me.queue.shift()
600 if _debug: print '>', ' '.join([quotify(w) for w in cmd.words])
601 me.send(' '.join([quotify(w) for w in cmd.words]))
606 Return an unused job tag.
608 May be of use when composing commands by hand.
610 tag = 'J%05d' % me.tagseq
614 ## --- Built-in handler functions for server responses ---
616 def _detach(me, _, tag):
618 Respond to a BGDETACH TAG message.
620 Move the current foreground command to the background.
622 assert tag not in me.cmd
623 me.cmd[tag] = me.cmd[None]
626 def _response(me, code, tag, *w):
628 Respond to an OK, INFO or FAIL message.
630 If this is a message for a background job, find the tag; then dispatch
631 the result to the command object.
633 if code.startswith('BG'):
638 cmd.response(code, *w)
640 def _fgresponse(me, code, *w):
641 """Process responses to the foreground command."""
642 me._response(code, None, *w)
644 ## --- Interface methods ---
646 def rawcommand(me, cmd):
648 Submit the TripeCommand CMD to the server, and look after it until it
651 if not me.connectedp():
652 raise TripeConnectionError('connection closed')
656 def command(me, *cmd, **kw):
657 """Convenience wrapper for creating a TripeCommandIterator object."""
658 return TripeCommandIterator(me, cmd, **kw)
660 ## --- Convenience methods for server commands ---
662 def add(me, peer, *addr, **kw):
663 return _simple(me.command(bg = True,
665 _kwopts(kw, ['tunnel', 'keepalive', 'cork']) +
669 return _oneline(me.command('ADDR', peer))
671 return _keyvals(me.command('ALGS'))
672 def checkchal(me, chal):
673 return _simple(me.command('CHECKCHAL', chal))
675 return _simple(me.command('DAEMON'))
676 def eping(me, peer, **kw):
677 return _oneline(me.command(bg = True,
679 _kwopts(kw, ['timeout']) +
681 def forcekx(me, peer):
682 return _simple(me.command('FORCEKX', peer))
684 return _oneline(me.command('GETCHAL', filter = _tokenjoin))
685 def greet(me, peer, chal):
686 return _simple(me.command('GREET', peer, chal))
688 return list(me.command('HELP', filter = _tokenjoin))
689 def ifname(me, peer):
690 return _oneline(me.command('IFNAME', peer, filter = _tokenjoin))
692 return _simple(me.command('KILL', peer))
694 return list(me.command('LIST', filter = _tokenjoin))
695 def notify(me, *msg):
696 return _simple(me.command('NOTIFY', *msg))
697 def peerinfo(me, peer):
698 return _keyvals(me.command('PEERINFO', peer))
699 def ping(me, peer, **kw):
700 return _oneline(me.command(bg = True,
702 _kwopts(kw, ['timeout']) +
705 return _oneline(me.command('PORT', filter = _tokenjoin))
707 return _simple(me.command('QUIT'))
709 return _simple(me.command('RELOAD'))
711 return _keyvals(me.command('SERVINFO'))
712 def setifname(me, new):
713 return _simple(me.command('SETIFNAME', new))
714 def svcclaim(me, service, version):
715 return _simple(me.command('SVCCLAIM', service, version))
716 def svcensure(me, service, version = None):
717 return _simple(me.command('SVCENSURE', service,
718 *((version is not None and [version]) or [])))
719 def svcfail(me, job, *msg):
720 return _simple(me.command('SVCFAIL', job, *msg))
721 def svcinfo(me, job, *msg):
722 return _simple(me.command('SVCINFO', job, *msg))
724 return list(me.command('SVCLIST'))
726 return _simple(me.command('SVCOK', job))
727 def svcquery(me, service):
728 return _keyvals(me.command('SVCQUERY', service))
729 def svcrelease(me, service):
730 return _simple(me.command('SVCRELEASE', service))
731 def svcsubmit(me, service, *args, **kw):
732 return me.command(bg = True,
734 _kwopts(kw, ['version']) +
738 return _keyvals(me.command('STATS', peer))
739 def trace(me, *args):
740 return _tracelike(me.command('TRACE', *args))
742 return list(me.command('TUNNELS', filter = _tokenjoin))
744 return _oneline(me.command('VERSION', filter = _tokenjoin))
746 return _simple(me.command('WARN', *msg))
747 def watch(me, *args):
748 return _tracelike(me.command('WATCH', *args))
750 ###--------------------------------------------------------------------------
751 ### Asynchronous commands.
753 class Queue (object):
755 A queue of things arriving asynchronously.
757 This is a very simple single-reader multiple-writer queue. It's useful for
758 more complex coroutines which need to cope with a variety of possible
763 """Create a new empty queue."""
764 me.contents = M.Array()
769 Internal: wait for an item to arrive in the queue.
771 Complain if someone is already waiting, because this is just a
775 raise ValueError('queue already being waited on')
777 me.waiter = Coroutine.getcurrent()
778 while not me.contents:
779 me.waiter.parent.switch()
785 Remove and return the item at the head of the queue.
787 If the queue is empty, wait until an item arrives.
790 return me.contents.shift()
794 Return the item at the head of the queue without removing it.
796 If the queue is empty, wait until an item arrives.
799 return me.contents[0]
803 Write THING to the queue.
805 If someone is waiting on the queue, wake him up immediately; otherwise
806 just leave the item there for later.
808 me.contents.push(thing)
812 class TripeAsynchronousCommand (TripeCommand):
814 Asynchronous commands.
816 This is the complicated way of issuing commands. You must set up a queue,
817 and associate the command with the queue. Responses arriving for the
818 command will be put on the queue as an triple of the form (TAG, CODE, REST)
819 -- where TAG is an object of your choice, not interpreted by this class,
820 CODE is the server's response code (OK, INFO, FAIL), and REST is the list
821 of the rest of the server's tokens.
823 Using this, you can write coroutines which process many commands (and
824 possibly other events) simultaneously.
827 def __init__(me, queue, tag, words):
828 """Make an asynchronous command consisting of the given WORDS, which
829 sends responses to QUEUE, labelled with TAG."""
830 TripeCommand.__init__(me, words)
834 def response(me, code, *stuff):
835 """Handle a server response by writing it to the caller's queue."""
836 me.queue.put((me.tag, code, list(stuff)))
838 ###--------------------------------------------------------------------------
839 ### Selecting command dispatcher.
841 class SelCommandDispatcher (TripeCommandDispatcher):
843 A command dispatcher which integrates with mLib's I/O-event system.
845 To use, simply create an instance and run mLib.select in a loop in your
849 def __init__(me, socket):
851 Create an instance; SOCKET is the admin socket to connect to.
853 Note that no connection is made initially.
855 TripeCommandDispatcher.__init__(me, socket)
859 """Connection hook: wires itself into the mLib select machinery."""
860 TripeCommandDispatcher.connected(me)
861 me.selfile = M.SelFile(me.sock.fileno(), M.SEL_READ, me.receive)
864 def disconnected(me, reason):
865 """Disconnection hook: removes itself from the mLib select machinery."""
866 TripeCommandDispatcher.disconnected(me, reason)
869 ###--------------------------------------------------------------------------
872 class TripeJobCancelled (Exception):
874 Exception sent to job handler if the client kills the job.
876 Not propagated further.
880 class TripeJobError (Exception):
882 Exception to cause failure report for running job.
884 Sends an SVCFAIL code back.
888 class TripeSyntaxError (Exception):
890 Exception to report a syntax error for a job.
892 Sends an SVCFAIL bad-svc-syntax message back.
896 class TripeServiceManager (SelCommandDispatcher):
898 A command dispatcher with added handling for incoming service requests.
900 There is usually only one instance of this class, called svcmgr. Some of
901 the support functions in this module assume that this is the case.
903 To use, run mLib.select in a loop until the quitp method returns true;
904 then, in a non-root coroutine, register your services by calling `add', and
905 then call `running' when you've finished setting up.
907 The instance handles server service messages SVCJOB, SVCCANCEL and
908 SVCCLAIM. It maintains a table of running services. Incoming jobs cause
909 the service's `job' method to be invoked; SVCCANCEL sends a
910 TripeJobCancelled exception to the handler coroutine, and SVCCLAIM causes
911 the relevant service to be deregistered.
913 There is no base class for jobs, but a job must implement two methods:
915 start() Begin processing; might be a no-op.
917 cancel() Stop processing; the original client has killed the
920 The life of a service manager is divided into two parts: setup and running;
921 you tell the manager that you've finished setting up by calling the
922 `running' method. If, at any point after setup is finished, there are no
923 remaining services or jobs, `quitp' will return true, ending the process.
926 ## --- Attributes ---
928 ## svc Mapping name -> service object
930 ## job Mapping jobid -> job handler coroutine
932 ## runningp True when setup is finished
934 ## _quitp True if explicit quit has been requested
936 def __init__(me, socket):
938 Initialize the service manager.
940 SOCKET is the administration socket to connect to.
942 SelCommandDispatcher.__init__(me, socket)
946 me.handler['SVCCANCEL'] = me._cancel
947 me.handler['SVCJOB'] = me._job
948 me.handler['SVCCLAIM'] = me._claim
952 """Register a new service; SVC is a TripeService instance."""
953 assert svc.name not in me.svc
954 me.svcclaim(svc.name, svc.version)
955 me.svc[svc.name] = svc
957 def _cancel(me, _, jid):
959 Called when the server cancels a job; invokes the job's `cancel' method.
965 def _claim(me, _, svc, __):
966 """Called when another program claims our service at a higher version."""
969 def _job(me, _, jid, svc, cmd, *args):
971 Called when the server sends us a job to do.
973 Calls the service to collect a job, and begins processing it.
975 assert jid not in me.job
976 svc = me.svc[svc.lower()]
977 job = svc.job(jid, cmd, args)
982 """Answer true if setup is finished."""
985 def jobdone(me, jid):
986 """Informs the service manager that the job with id JID has finished."""
994 Return true if no services or jobs are active (and, therefore, if this
995 process can quit without anyone caring).
997 return me._quitp or (me.runningp and ((not me.svc and not me.job) or
1001 """Forces the quit flag (returned by quitp) on."""
1004 class TripeService (object):
1008 The NAME and VERSION are passed on to the server. The CMDTAB is a
1009 dictionary mapping command names (in lowercase) to command objects.
1011 If the CMDTAB doesn't have entries for commands HELP and QUIT then defaults
1014 TripeService itself is mostly agnostic about the nature of command objects,
1015 but the TripeServiceJob class (below) has some requirements. The built-in
1016 HELP command requires command objects to have `usage' attributes.
1019 def __init__(me, name, version, cmdtab):
1021 Create and register a new service with the given NAME and VERSION.
1023 CMDTAB maps command names (in lower-case) to command objects.
1026 me.version = version
1029 me.cmd.setdefault('help',
1030 TripeServiceCommand('help', 0, 0, '', me._help))
1031 me.cmd.setdefault('quit',
1032 TripeServiceCommand('quit', 0, 0, '', me._quit))
1034 def job(me, jid, cmd, args):
1036 Called by the service manager: a job arrived with id JID.
1038 It asks for comamnd CMD with argument list ARGS. Creates a new job,
1039 passing it the information needed.
1041 return TripeServiceJob(jid, me, cmd, me.cmd.get(cmd.lower()), args)
1043 ## Simple default command handlers, complying with the spec in
1044 ## tripe-service(7).
1047 """Send a help summary to the user."""
1048 cmds = me.cmd.items()
1050 for name, cmd in cmds:
1051 svcinfo(name, *cmd.usage)
1054 """Terminate the service manager."""
1055 svcmgr.notify('svc-quit', me.name, 'admin-request')
1058 class TripeServiceCommand (object):
1059 """A simple service command."""
1061 def __init__(me, name, min, max, usage, func):
1063 Creates a new command.
1065 NAME is the command's name (in lowercase).
1067 MIN and MAX are the minimum and maximum number of allowed arguments (used
1068 for checking); either may be None to indicate no minimum or maximum.
1070 USAGE is a usage string, used for generating help and error messages.
1072 FUNC is the function to invoke.
1077 me.usage = usage.split()
1082 Called when the command is invoked.
1084 Does minimal checking of the arguments and calls the supplied function.
1086 if (me.min is not None and len(args) < me.min) or \
1087 (me.max is not None and len(args) > me.max):
1088 raise TripeSyntaxError
1091 class TripeServiceJob (Coroutine):
1093 Job handler coroutine.
1095 A standard TripeService invokes a TripeServiceJob for each incoming job
1096 request, passing it the jobid, command and arguments, and a command
1097 object. The command object needs the following attributes.
1099 usage A usage list (excluding the command name) showing
1100 arguments and options.
1102 run(*ARGS) Function to react to the command with ARGS split into
1103 separate arguments. Invoked in a coroutine. The
1104 svcinfo function (not the TripeCommandDispatcher
1105 method) may be used to send INFO lines. The function
1106 may raise TripeJobError to send a FAIL response back,
1107 or TripeSyntaxError to send a generic usage error.
1108 TripeJobCancelled exceptions are trapped silently.
1109 Other exceptions are translated into a generic
1110 internal-error message.
1112 This class automatically takes care of sending some closing response to the
1113 job, and for informing the service manager that the job is completed.
1115 The `jid' attribute stores the job's id.
1118 def __init__(me, jid, svc, cmd, command, args):
1122 The job is created with id JID, for service SVC, processing command name
1123 CMD (which the service resolved into the command object COMMAND, or
1124 None), and with the arguments ARGS.
1126 Coroutine.__init__(me)
1130 me.command = command
1135 Main body of the coroutine.
1137 Does the tedious exception handling boilerplate and invokes the command's
1142 if me.command is None:
1143 svcmgr.svcfail(me.jid, 'unknown-svc-command', me.cmd)
1145 me.command.run(*me.args)
1146 svcmgr.svcok(me.jid)
1147 except TripeJobError, exc:
1148 svcmgr.svcfail(me.jid, *exc.args)
1149 except TripeSyntaxError:
1150 svcmgr.svcfail(me.jid, 'bad-svc-syntax',
1151 me.svc.name, me.command.name,
1153 except TripeJobCancelled:
1155 except Exception, exc:
1156 svcmgr.svcfail(me.jid, 'svc-internal-error',
1157 exc.__class__.__name__, str(exc))
1159 svcmgr.jobdone(me.jid)
1162 """Invoked by the service manager to start running the coroutine."""
1166 """Invoked by the service manager to cancel the job."""
1167 me.throw(TripeJobCancelled())
1171 If invoked from a TripeServiceJob coroutine, sends an INFO line to the
1172 job's sender, automatically using the correct job id.
1174 svcmgr.svcinfo(Coroutine.getcurrent().jid, *args)
1176 def _setupsvc(tab, func):
1178 Setup coroutine for setting up service programs.
1180 Register the given services.
1184 svcmgr.addsvc(service)
1190 svcmgr = TripeServiceManager(None)
1192 def runservices(socket, tab, init = None, setup = None, daemon = False):
1194 Function to start a service provider.
1196 SOCKET is the socket to connect to, usually tripesock.
1198 TAB is a list of entries. An entry may be either a tuple
1200 (NAME, VERSION, COMMANDS)
1202 or a service object (e.g., a TripeService instance).
1204 COMMANDS is a dictionary mapping command names to tuples
1206 (MIN, MAX, USAGE, FUNC)
1208 of arguments for a TripeServiceCommand object.
1210 If DAEMON is true, then the process is forked into the background before we
1211 start. If INIT is given, it is called in the main coroutine, immediately
1212 after forking. If SETUP is given, it is called in a coroutine, after
1213 calling INIT and setting up the services but before marking the service
1216 It is a really bad idea to do any initialization, particularly setting up
1217 coroutines, outside of the INIT or SETUP functions. In particular, if
1218 we're using rmcr for fake coroutines, the daemonizing fork will kill off
1219 the currently established coroutines in a most surprising way.
1221 The function runs a main select loop until the service manager decides to
1226 svcmgr.socket = socket
1230 if not isinstance(service, tuple):
1231 svcs.append(service)
1233 name, version, commands = service
1235 for cmd, stuff in commands.iteritems():
1236 cmdmap[cmd] = TripeServiceCommand(cmd, *stuff)
1237 svcs.append(TripeService(name, version, cmdmap))
1240 if init is not None:
1242 Coroutine(_setupsvc).switch(svcs, setup)
1243 while not svcmgr.quitp():
1244 for cr, args, kw in _spawnq:
1245 cr.switch(*args, **kw)
1249 def spawn(cr, *args, **kw):
1251 Utility for spawning coroutines.
1253 The coroutine CR is made to be a direct child of the root coroutine, and
1254 invoked by it with the given arguments.
1257 _spawnq.append((cr, args, kw))
1259 ###--------------------------------------------------------------------------
1260 ### Utilities for services.
1262 _timeunits = {'s': 1, 'm': 60, 'h': 3600, 'd': 86400}
1264 """Parse the timespec SPEC, returning a number of seconds."""
1266 if len(spec) > 1 and spec[-1] in _timeunits:
1267 mul = _timeunits[spec[-1]]
1272 raise TripeJobError('bad-time-spec', spec)
1274 raise TripeJobError('bad-time-spec', spec)
1275 return mul * int(spec)
1277 class OptParse (object):
1279 Parse options from a command list in the conventional fashion.
1281 ARGS is a list of arguments to a command. ALLOWED is a sequence of allowed
1282 options. The returned values are the option tags. During parsing, the
1283 `arg' method may be used to retrieve the argument for the most recent
1284 option. Afterwards, `rest' may be used to retrieve the remaining
1285 non-option arguments, and do a simple check on how many there are.
1287 The parser correctly handles `--' option terminators.
1290 def __init__(me, args, allowed):
1292 Create a new option parser.
1294 The parser will scan the ARGS for options given in the sequence ALLOWED
1295 (which are expected to include the `-' prefix).
1299 me.allowed[a] = True
1300 me.args = list(args)
1303 """Iterator protocol: I am my own iterator."""
1308 Iterator protocol: return the next option.
1310 If we've run out, raise StopIteration.
1312 if len(me.args) == 0 or \
1313 len(me.args[0]) < 2 or \
1314 not me.args[0].startswith('-'):
1316 opt = me.args.pop(0)
1319 if opt not in me.allowed:
1320 raise TripeSyntaxError
1325 Return the argument for the most recent option.
1327 If none is available, raise TripeSyntaxError.
1329 if len(me.args) == 0:
1330 raise TripeSyntaxError
1331 return me.args.pop(0)
1333 def rest(me, min = None, max = None):
1335 After option parsing is done, return the remaining arguments.
1337 Check that there are at least MIN and at most MAX arguments remaining --
1338 either may be None to suppress the check.
1340 if (min is not None and len(me.args) < min) or \
1341 (max is not None and len(me.args) > max):
1342 raise TripeSyntaxError
1345 ###----- That's all, folks --------------------------------------------------