302 lines
10 KiB
Python
302 lines
10 KiB
Python
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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#
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# proxy.py — helper for Python-based external (xml-rpc) ikiwiki plugins
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#
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# Copyright © martin f. krafft <madduck@madduck.net>
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# .
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# THIS SOFTWARE IS PROVIDED BY IKIWIKI AND CONTRIBUTORS ``AS IS''
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION
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# OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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__name__ = 'proxy.py'
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__description__ = 'helper for Python-based external (xml-rpc) ikiwiki plugins'
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__version__ = '0.1'
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__author__ = 'martin f. krafft <madduck@madduck.net>'
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__copyright__ = 'Copyright © ' + __author__
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__licence__ = 'BSD-2-clause'
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import sys
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import time
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import xmlrpclib
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import xml.parsers.expat
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from SimpleXMLRPCServer import SimpleXMLRPCDispatcher
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class _IkiWikiExtPluginXMLRPCDispatcher(SimpleXMLRPCDispatcher):
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def __init__(self, allow_none=False, encoding=None):
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try:
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SimpleXMLRPCDispatcher.__init__(self, allow_none, encoding)
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except TypeError:
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# see http://bugs.debian.org/470645
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# python2.4 and before only took one argument
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SimpleXMLRPCDispatcher.__init__(self)
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def dispatch(self, method, params):
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return self._dispatch(method, params)
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class XMLStreamParser(object):
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def __init__(self):
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self._parser = xml.parsers.expat.ParserCreate()
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self._parser.StartElementHandler = self._push_tag
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self._parser.EndElementHandler = self._pop_tag
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self._parser.XmlDeclHandler = self._check_pipelining
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self._reset()
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def _reset(self):
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self._stack = list()
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self._acc = r''
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self._first_tag_received = False
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def _push_tag(self, tag, attrs):
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self._stack.append(tag)
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self._first_tag_received = True
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def _pop_tag(self, tag):
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top = self._stack.pop()
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if top != tag:
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raise ParseError, 'expected %s closing tag, got %s' % (top, tag)
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def _request_complete(self):
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return self._first_tag_received and len(self._stack) == 0
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def _check_pipelining(self, *args):
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if self._first_tag_received:
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raise PipeliningDetected, 'need a new line between XML documents'
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def parse(self, data):
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self._parser.Parse(data, False)
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self._acc += data
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if self._request_complete():
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ret = self._acc
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self._reset()
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return ret
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class ParseError(Exception):
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pass
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class PipeliningDetected(Exception):
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pass
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class _IkiWikiExtPluginXMLRPCHandler(object):
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def __init__(self, debug_fn):
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self._dispatcher = _IkiWikiExtPluginXMLRPCDispatcher()
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self.register_function = self._dispatcher.register_function
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self._debug_fn = debug_fn
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def register_function(self, function, name=None):
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# will be overwritten by __init__
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pass
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@staticmethod
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def _write(out_fd, data):
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out_fd.write(str(data))
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out_fd.flush()
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@staticmethod
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def _read(in_fd):
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ret = None
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parser = XMLStreamParser()
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while True:
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line = in_fd.readline()
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if len(line) == 0:
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# ikiwiki exited, EOF received
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return None
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ret = parser.parse(line)
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# unless this returns non-None, we need to loop again
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if ret is not None:
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return ret
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def send_rpc(self, cmd, in_fd, out_fd, *args, **kwargs):
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xml = xmlrpclib.dumps(sum(kwargs.iteritems(), args), cmd)
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self._debug_fn("calling ikiwiki procedure `%s': [%s]" % (cmd, xml))
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_IkiWikiExtPluginXMLRPCHandler._write(out_fd, xml)
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self._debug_fn('reading response from ikiwiki...')
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xml = _IkiWikiExtPluginXMLRPCHandler._read(in_fd)
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self._debug_fn('read response to procedure %s from ikiwiki: [%s]' % (cmd, xml))
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if xml is None:
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# ikiwiki is going down
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self._debug_fn('ikiwiki is going down, and so are we...')
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raise _IkiWikiExtPluginXMLRPCHandler._GoingDown
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data = xmlrpclib.loads(xml)[0][0]
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self._debug_fn('parsed data from response to procedure %s: [%s]' % (cmd, data))
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return data
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def handle_rpc(self, in_fd, out_fd):
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self._debug_fn('waiting for procedure calls from ikiwiki...')
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xml = _IkiWikiExtPluginXMLRPCHandler._read(in_fd)
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if xml is None:
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# ikiwiki is going down
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self._debug_fn('ikiwiki is going down, and so are we...')
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raise _IkiWikiExtPluginXMLRPCHandler._GoingDown
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self._debug_fn('received procedure call from ikiwiki: [%s]' % xml)
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params, method = xmlrpclib.loads(xml)
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ret = self._dispatcher.dispatch(method, params)
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xml = xmlrpclib.dumps((ret,), methodresponse=True)
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self._debug_fn('sending procedure response to ikiwiki: [%s]' % xml)
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_IkiWikiExtPluginXMLRPCHandler._write(out_fd, xml)
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return ret
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class _GoingDown:
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pass
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class IkiWikiProcedureProxy(object):
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# how to communicate None to ikiwiki
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_IKIWIKI_NIL_SENTINEL = {'null':''}
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# sleep during each iteration
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_LOOP_DELAY = 0.1
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def __init__(self, id, in_fd=sys.stdin, out_fd=sys.stdout, debug_fn=None):
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self._id = id
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self._in_fd = in_fd
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self._out_fd = out_fd
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self._hooks = list()
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self._functions = list()
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self._imported = False
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if debug_fn is not None:
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self._debug_fn = debug_fn
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else:
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self._debug_fn = lambda s: None
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self._xmlrpc_handler = _IkiWikiExtPluginXMLRPCHandler(self._debug_fn)
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self._xmlrpc_handler.register_function(self._importme, name='import')
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def rpc(self, cmd, *args, **kwargs):
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def subst_none(seq):
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for i in seq:
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if i is None:
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yield IkiWikiProcedureProxy._IKIWIKI_NIL_SENTINEL
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else:
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yield i
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args = list(subst_none(args))
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kwargs = dict(zip(kwargs.keys(), list(subst_none(kwargs.itervalues()))))
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ret = self._xmlrpc_handler.send_rpc(cmd, self._in_fd, self._out_fd,
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*args, **kwargs)
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if ret == IkiWikiProcedureProxy._IKIWIKI_NIL_SENTINEL:
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ret = None
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return ret
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def hook(self, type, function, name=None, id=None, last=False):
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if self._imported:
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raise IkiWikiProcedureProxy.AlreadyImported
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if name is None:
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name = function.__name__
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if id is None:
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id = self._id
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def hook_proxy(*args):
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# curpage = args[0]
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# kwargs = dict([args[i:i+2] for i in xrange(1, len(args), 2)])
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ret = function(self, *args)
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self._debug_fn("%s hook `%s' returned: [%s]" % (type, name, ret))
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if ret == IkiWikiProcedureProxy._IKIWIKI_NIL_SENTINEL:
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raise IkiWikiProcedureProxy.InvalidReturnValue, \
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'hook functions are not allowed to return %s' \
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% IkiWikiProcedureProxy._IKIWIKI_NIL_SENTINEL
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if ret is None:
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ret = IkiWikiProcedureProxy._IKIWIKI_NIL_SENTINEL
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return ret
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self._hooks.append((id, type, name, last))
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self._xmlrpc_handler.register_function(hook_proxy, name=name)
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def inject(self, rname, function, name=None, memoize=True):
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if self._imported:
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raise IkiWikiProcedureProxy.AlreadyImported
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if name is None:
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name = function.__name__
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self._functions.append((rname, name, memoize))
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self._xmlrpc_handler.register_function(function, name=name)
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def getargv(self):
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return self.rpc('getargv')
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def setargv(self, argv):
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return self.rpc('setargv', argv)
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def getvar(self, hash, key):
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return self.rpc('getvar', hash, key)
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def setvar(self, hash, key, value):
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return self.rpc('setvar', hash, key, value)
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def getstate(self, page, id, key):
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return self.rpc('getstate', page, id, key)
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def setstate(self, page, id, key, value):
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return self.rpc('setstate', page, id, key, value)
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def pagespec_match(self, spec):
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return self.rpc('pagespec_match', spec)
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def error(self, msg):
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try:
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self.rpc('error', msg)
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except IOError, e:
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if e.errno != 32:
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raise
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import posix
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sys.exit(posix.EX_SOFTWARE)
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def run(self):
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try:
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while True:
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ret = self._xmlrpc_handler.handle_rpc(self._in_fd, self._out_fd)
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time.sleep(IkiWikiProcedureProxy._LOOP_DELAY)
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except _IkiWikiExtPluginXMLRPCHandler._GoingDown:
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return
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except Exception, e:
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import traceback
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self.error('uncaught exception: %s\n%s' \
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% (e, traceback.format_exc(sys.exc_info()[2])))
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return
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def _importme(self):
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self._debug_fn('importing...')
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for id, type, function, last in self._hooks:
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self._debug_fn('hooking %s/%s into %s chain...' % (id, function, type))
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self.rpc('hook', id=id, type=type, call=function, last=last)
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for rname, function, memoize in self._functions:
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self._debug_fn('injecting %s as %s...' % (function, rname))
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self.rpc('inject', name=rname, call=function, memoize=memoize)
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self._imported = True
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return IkiWikiProcedureProxy._IKIWIKI_NIL_SENTINEL
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class InvalidReturnValue(Exception):
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pass
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class AlreadyImported(Exception):
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pass
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