# proxy.py — helper for Python-based external (xml-rpc) ikiwiki plugins
#
# Copyright © martin f. krafft <madduck@madduck.net>
-# 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 <madduck@madduck.net>'
__copyright__ = 'Copyright © ' + __author__
-__licence__ = 'GPLv2'
-
-LOOP_DELAY = 0.1
+__licence__ = 'BSD-2-clause'
import sys
import time
# 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()
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
@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:
if ret is not None:
return ret
- def send_rpc(self, cmd, in_fd, out_fd, **kwargs):
- xml = xmlrpclib.dumps(sum(kwargs.iteritems(), ()), cmd)
- self._debug_fn('sending xml to ikiwiki to call procedure %s: [%s]' % (cmd, xml))
+ 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)
self._debug_fn('reading response from ikiwiki...')
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:
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