X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/646392f3672094b90dec02eff1b0d4ac4ebb0742..c3198e519388044894515565ee27f11614287bd1:/plugins/proxy.py diff --git a/plugins/proxy.py b/plugins/proxy.py old mode 100644 new mode 100755 index 582010c9a..2a6222aa0 --- a/plugins/proxy.py +++ b/plugins/proxy.py @@ -1,37 +1,90 @@ -#!/usr/bin/python +#!/usr/bin/env python3 # -*- coding: utf-8 -*- # # 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 +# Copyright © 2008 martin f. krafft +# 2008-2011 Joey Hess +# 2012 W. Trevor King +# +# 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' +__version__ = '0.2' __author__ = 'martin f. krafft ' __copyright__ = 'Copyright © ' + __author__ -__licence__ = 'GPLv2' - -LOOP_DELAY = 0.1 +__licence__ = 'BSD-2-clause' import sys import time -import xmlrpclib import xml.parsers.expat -from SimpleXMLRPCServer import SimpleXMLRPCDispatcher +try: # Python 3 + import xmlrpc.client as _xmlrpc_client +except ImportError: # Python 2 + import xmlrpclib as _xmlrpc_client +try: # Python 3 + import xmlrpc.server as _xmlrpc_server +except ImportError: # Python 2 + import SimpleXMLRPCServer as _xmlrpc_server + + +class ParseError (Exception): + pass + + +class PipeliningDetected (Exception): + pass + + +class GoingDown (Exception): + pass -class _IkiWikiExtPluginXMLRPCDispatcher(SimpleXMLRPCDispatcher): + +class InvalidReturnValue (Exception): + pass + + +class AlreadyImported (Exception): + pass + + +class _IkiWikiExtPluginXMLRPCDispatcher(_xmlrpc_server.SimpleXMLRPCDispatcher): def __init__(self, allow_none=False, encoding=None): try: - SimpleXMLRPCDispatcher.__init__(self, allow_none, encoding) + _xmlrpc_server.SimpleXMLRPCDispatcher.__init__( + self, allow_none, encoding) except TypeError: # see http://bugs.debian.org/470645 # python2.4 and before only took one argument - SimpleXMLRPCDispatcher.__init__(self) + _xmlrpc_server.SimpleXMLRPCDispatcher.__init__(self) + + def dispatch(self, method, params): + return self._dispatch(method, params) + -class _XMLStreamParser(object): +class XMLStreamParser(object): def __init__(self): self._parser = xml.parsers.expat.ParserCreate() @@ -52,14 +105,15 @@ class _XMLStreamParser(object): def _pop_tag(self, tag): top = self._stack.pop() if top != tag: - raise ParseError, 'expected %s closing tag, got %s' % (top, tag) + raise ParseError( + 'expected {0} closing tag, got {1}'.format(top, tag)) def _request_complete(self): return self._first_tag_received and len(self._stack) == 0 def _check_pipelining(self, *args): if self._first_tag_received: - raise PipeliningDetected, 'need a new line between XML documents' + raise PipeliningDetected('need a new line between XML documents') def parse(self, data): self._parser.Parse(data, False) @@ -69,16 +123,11 @@ class _XMLStreamParser(object): self._reset() return ret - class ParseError(Exception): - pass - - class PipeliningDetected(Exception): - pass 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 +137,13 @@ 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: @@ -106,44 +155,72 @@ 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) - self._debug_fn("calling ikiwiki procedure `%s': [%s]" % (cmd, xml)) - _IkiWikiExtPluginXMLRPCHandler._write(out_fd, xml) + def send_rpc(self, cmd, in_fd, out_fd, *args, **kwargs): + xml = _xmlrpc_client.dumps(sum(kwargs.items(), args), cmd) + self._debug_fn( + "calling ikiwiki procedure `{0}': [{1}]".format(cmd, repr(xml))) + # ensure that encoded is a str (bytestring in Python 2, Unicode in 3) + if str is bytes and not isinstance(xml, str): + encoded = xml.encode('utf8') + else: + encoded = xml + _IkiWikiExtPluginXMLRPCHandler._write(out_fd, encoded) self._debug_fn('reading response from ikiwiki...') - xml = _IkiWikiExtPluginXMLRPCHandler._read(in_fd) - self._debug_fn('read response to procedure %s from ikiwiki: [%s]' % (cmd, xml)) + response = _IkiWikiExtPluginXMLRPCHandler._read(in_fd) + if str is bytes and not isinstance(response, str): + xml = response.encode('utf8') + else: + xml = response + self._debug_fn( + 'read response to procedure {0} from ikiwiki: [{1}]'.format( + cmd, repr(xml))) if xml is None: # ikiwiki is going down - return None + self._debug_fn('ikiwiki is going down, and so are we...') + raise GoingDown() - data = xmlrpclib.loads(xml)[0] - self._debug_fn('parsed data from response to procedure %s: [%s]' % (cmd, data)) + data = _xmlrpc_client.loads(xml)[0][0] + self._debug_fn( + 'parsed data from response to procedure {0}: [{1}]'.format( + cmd, repr(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 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: [{0}]'.format(xml)) + params, method = _xmlrpc_client.loads(xml) + ret = self._dispatcher.dispatch(method, params) + xml = _xmlrpc_client.dumps((ret,), methodresponse=True) + self._debug_fn( + 'sending procedure response to ikiwiki: [{0}]'.format(xml)) + _IkiWikiExtPluginXMLRPCHandler._write(out_fd, xml) return ret + 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 +228,112 @@ class IkiWikiProcedureProxy(object): self._xmlrpc_handler = _IkiWikiExtPluginXMLRPCHandler(self._debug_fn) self._xmlrpc_handler.register_function(self._importme, name='import') - def 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.values())))) + 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 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( + "{0} hook `{1}' returned: [{2}]".format(type, name, repr(ret))) + if ret == IkiWikiProcedureProxy._IKIWIKI_NIL_SENTINEL: + raise InvalidReturnValue( + 'hook functions are not allowed to return {0}'.format( + 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 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 as 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) - except Exception, e: - self._debug_fn('uncaught exception: %s' % e) - sys.exit(posix.EX_SOFTWARE) + ret = self._xmlrpc_handler.handle_rpc( + self._in_fd, self._out_fd) + time.sleep(IkiWikiProcedureProxy._LOOP_DELAY) + except GoingDown: + return + + except Exception as e: + import traceback + tb = traceback.format_exc() + self.error('uncaught exception: {0}\n{1}'.format(e, tb)) + return + + def _importme(self): + self._debug_fn('importing...') + for id, type, function, last in self._hooks: + self._debug_fn('hooking {0}/{1} into {2} chain...'.format( + 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 {0} as {1}...'.format(function, rname)) + self.rpc('inject', name=rname, call=function, memoize=memoize) + self._imported = True + return IkiWikiProcedureProxy._IKIWIKI_NIL_SENTINEL