X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/06fb2357e446541618cef8beadd2ab659f6c22ca..42b06a462f5e6271b3df20051aa41cb59f416f3c:/plugins/proxy.py diff --git a/plugins/proxy.py b/plugins/proxy.py index 55c552ab2..c2e9bd621 100644 --- a/plugins/proxy.py +++ b/plugins/proxy.py @@ -4,16 +4,35 @@ # proxy.py — helper for Python-based external (xml-rpc) ikiwiki plugins # # Copyright © martin f. krafft -# Released under the terms of the GNU GPL version 2 -# +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions +# are met: +# 1. Redistributions of source code must retain the above copyright +# notice, this list of conditions and the following disclaimer. +# 2. Redistributions in binary form must reproduce the above copyright +# notice, this list of conditions and the following disclaimer in the +# documentation and/or other materials provided with the distribution. +# . +# THIS SOFTWARE IS PROVIDED BY IKIWIKI AND CONTRIBUTORS ``AS IS'' +# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED +# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A +# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION +# OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF +# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND +# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, +# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT +# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +# SUCH DAMAGE. +# __name__ = 'proxy.py' __description__ = 'helper for Python-based external (xml-rpc) ikiwiki plugins' __version__ = '0.1' __author__ = 'martin f. krafft ' __copyright__ = 'Copyright © ' + __author__ -__licence__ = 'GPLv2' - -LOOP_DELAY = 0.1 +__licence__ = 'BSD-2-clause' import sys import time @@ -31,7 +50,10 @@ class _IkiWikiExtPluginXMLRPCDispatcher(SimpleXMLRPCDispatcher): # python2.4 and before only took one argument SimpleXMLRPCDispatcher.__init__(self) -class _XMLStreamParser(object): + def dispatch(self, method, params): + return self._dispatch(method, params) + +class XMLStreamParser(object): def __init__(self): self._parser = xml.parsers.expat.ParserCreate() @@ -77,8 +99,8 @@ class _XMLStreamParser(object): class _IkiWikiExtPluginXMLRPCHandler(object): - def __init__(self, debug_fn, allow_none=False, encoding=None): - self._dispatcher = _IkiWikiExtPluginXMLRPCDispatcher(allow_none, encoding) + def __init__(self, debug_fn): + self._dispatcher = _IkiWikiExtPluginXMLRPCDispatcher() self.register_function = self._dispatcher.register_function self._debug_fn = debug_fn @@ -88,13 +110,13 @@ class _IkiWikiExtPluginXMLRPCHandler(object): @staticmethod def _write(out_fd, data): - out_fd.write(data) + out_fd.write(str(data)) out_fd.flush() @staticmethod def _read(in_fd): ret = None - parser = _XMLStreamParser() + parser = XMLStreamParser() while True: line = in_fd.readline() if len(line) == 0: @@ -106,8 +128,8 @@ class _IkiWikiExtPluginXMLRPCHandler(object): if ret is not None: return ret - def send_rpc(self, cmd, in_fd, out_fd, **kwargs): - xml = xmlrpclib.dumps(sum(kwargs.iteritems(), ()), cmd) + def send_rpc(self, cmd, in_fd, out_fd, *args, **kwargs): + xml = xmlrpclib.dumps(sum(kwargs.iteritems(), args), cmd) self._debug_fn("calling ikiwiki procedure `%s': [%s]" % (cmd, xml)) _IkiWikiExtPluginXMLRPCHandler._write(out_fd, xml) @@ -117,33 +139,47 @@ class _IkiWikiExtPluginXMLRPCHandler(object): self._debug_fn('read response to procedure %s from ikiwiki: [%s]' % (cmd, xml)) if xml is None: # ikiwiki is going down - return None + self._debug_fn('ikiwiki is going down, and so are we...') + raise _IkiWikiExtPluginXMLRPCHandler._GoingDown - data = xmlrpclib.loads(xml)[0] + data = xmlrpclib.loads(xml)[0][0] self._debug_fn('parsed data from response to procedure %s: [%s]' % (cmd, data)) return data def handle_rpc(self, in_fd, out_fd): self._debug_fn('waiting for procedure calls from ikiwiki...') - ret = _IkiWikiExtPluginXMLRPCHandler._read(in_fd) - if ret is None: + xml = _IkiWikiExtPluginXMLRPCHandler._read(in_fd) + if xml is None: # ikiwiki is going down self._debug_fn('ikiwiki is going down, and so are we...') - return + raise _IkiWikiExtPluginXMLRPCHandler._GoingDown - self._debug_fn('received procedure call from ikiwiki: [%s]' % ret) - ret = self._dispatcher._marshaled_dispatch(ret) - self._debug_fn('sending procedure response to ikiwiki: [%s]' % ret) - _IkiWikiExtPluginXMLRPCHandler._write(out_fd, ret) + self._debug_fn('received procedure call from ikiwiki: [%s]' % xml) + params, method = xmlrpclib.loads(xml) + ret = self._dispatcher.dispatch(method, params) + xml = xmlrpclib.dumps((ret,), methodresponse=True) + self._debug_fn('sending procedure response to ikiwiki: [%s]' % xml) + _IkiWikiExtPluginXMLRPCHandler._write(out_fd, xml) return ret + class _GoingDown: + pass + class IkiWikiProcedureProxy(object): + # how to communicate None to ikiwiki + _IKIWIKI_NIL_SENTINEL = {'null':''} + + # sleep during each iteration + _LOOP_DELAY = 0.1 + def __init__(self, id, in_fd=sys.stdin, out_fd=sys.stdout, debug_fn=None): self._id = id self._in_fd = in_fd self._out_fd = out_fd self._hooks = list() + self._functions = list() + self._imported = False if debug_fn is not None: self._debug_fn = debug_fn else: @@ -151,25 +187,115 @@ class IkiWikiProcedureProxy(object): self._xmlrpc_handler = _IkiWikiExtPluginXMLRPCHandler(self._debug_fn) self._xmlrpc_handler.register_function(self._importme, name='import') - def register_hook(self, type, function): - self._hooks.append((type, function.__name__)) - self._xmlrpc_handler.register_function(function) + def rpc(self, cmd, *args, **kwargs): + def subst_none(seq): + for i in seq: + if i is None: + yield IkiWikiProcedureProxy._IKIWIKI_NIL_SENTINEL + else: + yield i - def _importme(self): - self._debug_fn('importing...') - for type, function in self._hooks: - self._debug_fn('hooking %s into %s chain...' % (function, type)) - self._xmlrpc_handler.send_rpc('hook', self._in_fd, self._out_fd, - id=self._id, type=type, call=function) - return 0 + args = list(subst_none(args)) + kwargs = dict(zip(kwargs.keys(), list(subst_none(kwargs.itervalues())))) + ret = self._xmlrpc_handler.send_rpc(cmd, self._in_fd, self._out_fd, + *args, **kwargs) + if ret == IkiWikiProcedureProxy._IKIWIKI_NIL_SENTINEL: + ret = None + return ret + + def hook(self, type, function, name=None, id=None, last=False): + if self._imported: + raise IkiWikiProcedureProxy.AlreadyImported + + if name is None: + name = function.__name__ + + if id is None: + id = self._id + + def hook_proxy(*args): +# curpage = args[0] +# kwargs = dict([args[i:i+2] for i in xrange(1, len(args), 2)]) + ret = function(self, *args) + self._debug_fn("%s hook `%s' returned: [%s]" % (type, name, ret)) + if ret == IkiWikiProcedureProxy._IKIWIKI_NIL_SENTINEL: + raise IkiWikiProcedureProxy.InvalidReturnValue, \ + 'hook functions are not allowed to return %s' \ + % IkiWikiProcedureProxy._IKIWIKI_NIL_SENTINEL + if ret is None: + ret = IkiWikiProcedureProxy._IKIWIKI_NIL_SENTINEL + return ret + + self._hooks.append((id, type, name, last)) + self._xmlrpc_handler.register_function(hook_proxy, name=name) + + def inject(self, rname, function, name=None, memoize=True): + if self._imported: + raise IkiWikiProcedureProxy.AlreadyImported + + if name is None: + name = function.__name__ + + self._functions.append((rname, name, memoize)) + self._xmlrpc_handler.register_function(function, name=name) + + def getargv(self): + return self.rpc('getargv') + + def setargv(self, argv): + return self.rpc('setargv', argv) + + def getvar(self, hash, key): + return self.rpc('getvar', hash, key) + + def setvar(self, hash, key, value): + return self.rpc('setvar', hash, key, value) + + def getstate(self, page, id, key): + return self.rpc('getstate', page, id, key) + + def setstate(self, page, id, key, value): + return self.rpc('setstate', page, id, key, value) + + def pagespec_match(self, spec): + return self.rpc('pagespec_match', spec) + + def error(self, msg): + try: + self.rpc('error', msg) + except IOError, e: + if e.errno != 32: + raise + import posix + sys.exit(posix.EX_SOFTWARE) def run(self): try: while True: ret = self._xmlrpc_handler.handle_rpc(self._in_fd, self._out_fd) - if ret is None: - return - time.sleep(LOOP_DELAY) + time.sleep(IkiWikiProcedureProxy._LOOP_DELAY) + except _IkiWikiExtPluginXMLRPCHandler._GoingDown: + return + except Exception, e: - self._debug_fn('uncaught exception: %s' % e) - sys.exit(posix.EX_SOFTWARE) + import traceback + self.error('uncaught exception: %s\n%s' \ + % (e, traceback.format_exc(sys.exc_info()[2]))) + return + + def _importme(self): + self._debug_fn('importing...') + for id, type, function, last in self._hooks: + self._debug_fn('hooking %s/%s into %s chain...' % (id, function, type)) + self.rpc('hook', id=id, type=type, call=function, last=last) + for rname, function, memoize in self._functions: + self._debug_fn('injecting %s as %s...' % (function, rname)) + self.rpc('inject', name=rname, call=function, memoize=memoize) + self._imported = True + return IkiWikiProcedureProxy._IKIWIKI_NIL_SENTINEL + + class InvalidReturnValue(Exception): + pass + + class AlreadyImported(Exception): + pass