| """RPC Client module.""" | |
| import sys | |
| import socket | |
| import pickle | |
| import __builtin__ | |
| import os | |
| # Default verbosity (0 = silent, 1 = print connections, 2 = print requests too) | |
| VERBOSE = 1 | |
| class Client: | |
| """RPC Client class. No need to derive a class -- it's fully generic.""" | |
| def __init__(self, address, verbose = VERBOSE): | |
| self._pre_init(address, verbose) | |
| self._post_init() | |
| def _pre_init(self, address, verbose = VERBOSE): | |
| if type(address) == type(0): | |
| address = ('', address) | |
| self._address = address | |
| self._verbose = verbose | |
| if self._verbose: print "Connecting to %s ..." % repr(address) | |
| self._socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) | |
| self._socket.connect(address) | |
| if self._verbose: print "Connected." | |
| self._lastid = 0 # Last id for which a reply has been received | |
| self._nextid = 1 # Id of next request | |
| self._replies = {} # Unprocessed replies | |
| self._rf = self._socket.makefile('r') | |
| self._wf = self._socket.makefile('w') | |
| def _post_init(self): | |
| self._methods = self._call('.methods') | |
| def __del__(self): | |
| self._close() | |
| def _close(self): | |
| if self._rf: self._rf.close() | |
| self._rf = None | |
| if self._wf: self._wf.close() | |
| self._wf = None | |
| if self._socket: self._socket.close() | |
| self._socket = None | |
| def __getattr__(self, name): | |
| if name in self._methods: | |
| method = _stub(self, name) | |
| setattr(self, name, method) # XXX circular reference | |
| return method | |
| raise AttributeError, name | |
| def _setverbose(self, verbose): | |
| self._verbose = verbose | |
| def _call(self, name, *args): | |
| return self._vcall(name, args) | |
| def _vcall(self, name, args): | |
| return self._recv(self._vsend(name, args)) | |
| def _send(self, name, *args): | |
| return self._vsend(name, args) | |
| def _send_noreply(self, name, *args): | |
| return self._vsend(name, args, 0) | |
| def _vsend_noreply(self, name, args): | |
| return self._vsend(name, args, 0) | |
| def _vsend(self, name, args, wantreply = 1): | |
| id = self._nextid | |
| self._nextid = id+1 | |
| if not wantreply: id = -id | |
| request = (name, args, id) | |
| if self._verbose > 1: print "sending request: %s" % repr(request) | |
| wp = pickle.Pickler(self._wf) | |
| wp.dump(request) | |
| return id | |
| def _recv(self, id): | |
| exception, value, rid = self._vrecv(id) | |
| if rid != id: | |
| raise RuntimeError, "request/reply id mismatch: %d/%d" % (id, rid) | |
| if exception is None: | |
| return value | |
| x = exception | |
| if hasattr(__builtin__, exception): | |
| x = getattr(__builtin__, exception) | |
| elif exception in ('posix.error', 'mac.error'): | |
| x = os.error | |
| if x == exception: | |
| exception = x | |
| raise exception, value | |
| def _vrecv(self, id): | |
| self._flush() | |
| if self._replies.has_key(id): | |
| if self._verbose > 1: print "retrieving previous reply, id = %d" % id | |
| reply = self._replies[id] | |
| del self._replies[id] | |
| return reply | |
| aid = abs(id) | |
| while 1: | |
| if self._verbose > 1: print "waiting for reply, id = %d" % id | |
| rp = pickle.Unpickler(self._rf) | |
| reply = rp.load() | |
| del rp | |
| if self._verbose > 1: print "got reply: %s" % repr(reply) | |
| rid = reply[2] | |
| arid = abs(rid) | |
| if arid == aid: | |
| if self._verbose > 1: print "got it" | |
| return reply | |
| self._replies[rid] = reply | |
| if arid > aid: | |
| if self._verbose > 1: print "got higher id, assume all ok" | |
| return (None, None, id) | |
| def _flush(self): | |
| self._wf.flush() | |
| from security import Security | |
| class SecureClient(Client, Security): | |
| def __init__(self, *args): | |
| import string | |
| apply(self._pre_init, args) | |
| Security.__init__(self) | |
| self._wf.flush() | |
| line = self._rf.readline() | |
| challenge = string.atoi(string.strip(line)) | |
| response = self._encode_challenge(challenge) | |
| line = repr(long(response)) | |
| if line[-1] in 'Ll': line = line[:-1] | |
| self._wf.write(line + '\n') | |
| self._wf.flush() | |
| self._post_init() | |
| class _stub: | |
| """Helper class for Client -- each instance serves as a method of the client.""" | |
| def __init__(self, client, name): | |
| self._client = client | |
| self._name = name | |
| def __call__(self, *args): | |
| return self._client._vcall(self._name, args) |