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Code Editor : asyncconn.py
#!/usr/bin/python3 ## Copyright (C) 2007, 2008, 2009, 2010, 2012, 2013 Red Hat, Inc. ## Copyright (C) 2008 Novell, Inc. ## Authors: Tim Waugh <twaugh@redhat.com>, Vincent Untz ## This program is free software; you can redistribute it and/or modify ## it under the terms of the GNU General Public License as published by ## the Free Software Foundation; either version 2 of the License, or ## (at your option) any later version. ## This program is distributed in the hope that it will be useful, ## but WITHOUT ANY WARRANTY; without even the implied warranty of ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ## GNU General Public License for more details. ## You should have received a copy of the GNU General Public License ## along with this program; if not, write to the Free Software ## Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. import cups import os from debug import * import debug ###### ###### A class to keep track of what we're trying to achieve in order ###### to display that to the user if authentication is required. ###### class SemanticOperations(object): def __init__ (self): self._operation_stack = [] def _begin_operation (self, operation): self._operation_stack.append (operation) def _end_operation (self): self._operation_stack.pop () def current_operation (self): try: return self._operation_stack[0] except IndexError: return None ###### ###### Destructible method call. Required so that all references can ###### be dropped when an asynchronous method call is destroyed. ###### class _AsyncMethodCall: def __init__ (self, fn, reply_handler, error_handler, auth_handler): self._fn = fn self._reply_handler = reply_handler self._error_handler = error_handler self._auth_handler = auth_handler self._destroyed = False debugprint ("+%s" % self) def __del__ (self): debugprint ("-%s" % self) def destroy (self): if self._destroyed: return debugprint ("DESTROY: %s" % self) self._destroyed = True self._reply_handler = None self._error_handler = None self._auth_handler = None self._reply_data = None self._error_data = None self._auth_data = None def run (self, *args, **kwds): self._reply_data = kwds.get ('reply_handler') self._error_data = kwds.get ('error_handler') self._auth_data = kwds.get ('auth_handler') kwds['reply_handler'] = self.reply_handler kwds['error_handler'] = self.error_handler kwds['auth_handler'] = self.auth_handler debugprint ("%s: calling %s" % (self, self._fn)) self._fn (*args, **kwds) def reply_handler (self, *args): if not self._destroyed: debugprint ("%s: to reply_handler at %s" % (self, self._reply_handler)) self._reply_handler (self, self._reply_data, *args) def error_handler (self, *args): if not self._destroyed: debugprint ("%s: to error_handler at %s" % (self, self._error_handler)) self._error_handler (self, self._error_data, *args) def auth_handler (self, *args): if not self._destroyed: debugprint ("%s: to auth_handler at %s" % (self, self._auth_handler)) self._auth_handler (self, self.auth_data, *args) ###### ###### An asynchronous libcups API using IPP or PolicyKit as ###### appropriate. ###### class Connection(SemanticOperations): def __init__ (self, reply_handler=None, error_handler=None, auth_handler=None, host=None, port=None, encryption=None, parent=None, try_as_root=True, prompt_allowed=True): super (Connection, self).__init__ () self._destroyed = False # Decide whether to use direct IPP or PolicyKit. if host is None: host = cups.getServer() use_pk = ((host.startswith ('/') or host == 'localhost') and os.getuid () != 0) def subst_reply_handler (conn, reply): self._subst_reply_handler (None, reply_handler, reply) def subst_error_handler (conn, exc): self._subst_error_handler (None, error_handler, exc) def subst_auth_handler (prompt, conn, method, resource): self._subst_auth_handler (None, auth_handler, prompt, method, resource) if use_pk and try_as_root: debugprint ("Using polkit-1 connection class") import asyncpk1 c = asyncpk1.PK1Connection (reply_handler=subst_reply_handler, error_handler=subst_error_handler, host=host, port=port, encryption=encryption, parent=parent) self._conn = c else: debugprint ("Using IPP connection class") import asyncipp c = asyncipp.IPPAuthConnection (reply_handler=subst_reply_handler, error_handler=subst_error_handler, auth_handler=subst_auth_handler, host=host, port=port, encryption=encryption, parent=parent, try_as_root=try_as_root, prompt_allowed=prompt_allowed, semantic=self) self._conn = c methodtype = type (self._conn.getPrinters) instancemethodtype = type (self._conn.getDevices) bindings = [] for fname in dir (self._conn): if fname.startswith ('_'): continue fn = getattr (self._conn, fname) if type (fn) != methodtype and type (fn) != instancemethodtype: continue if not hasattr (self, fname): setattr (self, fname, self._make_binding (fn)) bindings.append (fname) self._bindings = bindings self._methodcalls = [] debugprint ("+%s" % self) def __del__ (self): debug.debugprint ("-%s" % self) def destroy (self): debugprint ("DESTROY: %s" % self) self._destroyed = True try: self._conn.destroy () except AttributeError: pass for methodcall in self._methodcalls: methodcall.destroy () for binding in self._bindings: delattr (self, binding) def _make_binding (self, fn): return lambda *args, **kwds: self._call_function (fn, *args, **kwds) def _call_function (self, fn, *args, **kwds): methodcall = _AsyncMethodCall (fn, self._subst_reply_handler, self._subst_error_handler, self._subst_auth_handler) self._methodcalls.append (methodcall) methodcall.run (*args, **kwds) def _subst_reply_handler (self, methodcall, reply_handler, *args): if methodcall: methodcall.destroy () i = self._methodcalls.index (methodcall) del self._methodcalls[i] args = args[1:] if reply_handler and not self._destroyed: debugprint ("%s: chaining up to %s" % (self, reply_handler)) reply_handler (self, *args) def _subst_error_handler (self, methodcall, error_handler, *args): if methodcall: methodcall.destroy () i = self._methodcalls.index (methodcall) del self._methodcalls[i] args = args[1:] if error_handler and not self._destroyed: debugprint ("%s: chaining up to %s" % (self, error_handler)) error_handler (self, *args) def _subst_auth_handler (self, methodcall, auth_handler, prompt, method, resource): if methodcall: methodcall.destroy () i = self._methodcalls.index (methodcall) del self._methodcalls[i] if auth_handler and not self._destroyed: debugprint ("%s: chaining up to %s" % (self, auth_handler)) auth_handler (prompt, self, method, resource) def set_auth_info (self, password): """Call this from your auth_handler function.""" self.thread.set_auth_info (password) if __name__ == "__main__": # Demo from gi.repository import GObject set_debugging (True) class Test: def __init__ (self, quit): self._conn = Connection () self._quit = quit debugprint ("+%s" % self) def __del__ (self): debug.debugprint ("-%s" % self) def destroy (self): debugprint ("DESTROY: %s" % self) self._conn.destroy () if self._quit: loop.quit () def getDevices (self): self._conn.getDevices (reply_handler=self.getDevices_reply, error_handler=self.getDevices_error) def getDevices_reply (self, conn, result): print (conn, result) self.destroy () def getDevices_error (self, conn, exc): print (repr (exc)) self.destroy () t = Test (False) loop = GObject.MainLoop () t.getDevices () t.destroy () t = Test (True) t.getDevices () loop.run ()
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