| 1 | """RPC Client module."""
|
|---|
| 2 |
|
|---|
| 3 | import sys
|
|---|
| 4 | import socket
|
|---|
| 5 | import pickle
|
|---|
| 6 | import __builtin__
|
|---|
| 7 | import os
|
|---|
| 8 |
|
|---|
| 9 |
|
|---|
| 10 | # Default verbosity (0 = silent, 1 = print connections, 2 = print requests too)
|
|---|
| 11 | VERBOSE = 1
|
|---|
| 12 |
|
|---|
| 13 |
|
|---|
| 14 | class Client:
|
|---|
| 15 |
|
|---|
| 16 | """RPC Client class. No need to derive a class -- it's fully generic."""
|
|---|
| 17 |
|
|---|
| 18 | def __init__(self, address, verbose = VERBOSE):
|
|---|
| 19 | self._pre_init(address, verbose)
|
|---|
| 20 | self._post_init()
|
|---|
| 21 |
|
|---|
| 22 | def _pre_init(self, address, verbose = VERBOSE):
|
|---|
| 23 | if type(address) == type(0):
|
|---|
| 24 | address = ('', address)
|
|---|
| 25 | self._address = address
|
|---|
| 26 | self._verbose = verbose
|
|---|
| 27 | if self._verbose: print "Connecting to %s ..." % repr(address)
|
|---|
| 28 | self._socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
|
|---|
| 29 | self._socket.connect(address)
|
|---|
| 30 | if self._verbose: print "Connected."
|
|---|
| 31 | self._lastid = 0 # Last id for which a reply has been received
|
|---|
| 32 | self._nextid = 1 # Id of next request
|
|---|
| 33 | self._replies = {} # Unprocessed replies
|
|---|
| 34 | self._rf = self._socket.makefile('r')
|
|---|
| 35 | self._wf = self._socket.makefile('w')
|
|---|
| 36 |
|
|---|
| 37 | def _post_init(self):
|
|---|
| 38 | self._methods = self._call('.methods')
|
|---|
| 39 |
|
|---|
| 40 | def __del__(self):
|
|---|
| 41 | self._close()
|
|---|
| 42 |
|
|---|
| 43 | def _close(self):
|
|---|
| 44 | if self._rf: self._rf.close()
|
|---|
| 45 | self._rf = None
|
|---|
| 46 | if self._wf: self._wf.close()
|
|---|
| 47 | self._wf = None
|
|---|
| 48 | if self._socket: self._socket.close()
|
|---|
| 49 | self._socket = None
|
|---|
| 50 |
|
|---|
| 51 | def __getattr__(self, name):
|
|---|
| 52 | if name in self._methods:
|
|---|
| 53 | method = _stub(self, name)
|
|---|
| 54 | setattr(self, name, method) # XXX circular reference
|
|---|
| 55 | return method
|
|---|
| 56 | raise AttributeError, name
|
|---|
| 57 |
|
|---|
| 58 | def _setverbose(self, verbose):
|
|---|
| 59 | self._verbose = verbose
|
|---|
| 60 |
|
|---|
| 61 | def _call(self, name, *args):
|
|---|
| 62 | return self._vcall(name, args)
|
|---|
| 63 |
|
|---|
| 64 | def _vcall(self, name, args):
|
|---|
| 65 | return self._recv(self._vsend(name, args))
|
|---|
| 66 |
|
|---|
| 67 | def _send(self, name, *args):
|
|---|
| 68 | return self._vsend(name, args)
|
|---|
| 69 |
|
|---|
| 70 | def _send_noreply(self, name, *args):
|
|---|
| 71 | return self._vsend(name, args, 0)
|
|---|
| 72 |
|
|---|
| 73 | def _vsend_noreply(self, name, args):
|
|---|
| 74 | return self._vsend(name, args, 0)
|
|---|
| 75 |
|
|---|
| 76 | def _vsend(self, name, args, wantreply = 1):
|
|---|
| 77 | id = self._nextid
|
|---|
| 78 | self._nextid = id+1
|
|---|
| 79 | if not wantreply: id = -id
|
|---|
| 80 | request = (name, args, id)
|
|---|
| 81 | if self._verbose > 1: print "sending request: %s" % repr(request)
|
|---|
| 82 | wp = pickle.Pickler(self._wf)
|
|---|
| 83 | wp.dump(request)
|
|---|
| 84 | return id
|
|---|
| 85 |
|
|---|
| 86 | def _recv(self, id):
|
|---|
| 87 | exception, value, rid = self._vrecv(id)
|
|---|
| 88 | if rid != id:
|
|---|
| 89 | raise RuntimeError, "request/reply id mismatch: %d/%d" % (id, rid)
|
|---|
| 90 | if exception is None:
|
|---|
| 91 | return value
|
|---|
| 92 | x = exception
|
|---|
| 93 | if hasattr(__builtin__, exception):
|
|---|
| 94 | x = getattr(__builtin__, exception)
|
|---|
| 95 | elif exception in ('posix.error', 'mac.error'):
|
|---|
| 96 | x = os.error
|
|---|
| 97 | if x == exception:
|
|---|
| 98 | exception = x
|
|---|
| 99 | raise exception, value
|
|---|
| 100 |
|
|---|
| 101 | def _vrecv(self, id):
|
|---|
| 102 | self._flush()
|
|---|
| 103 | if self._replies.has_key(id):
|
|---|
| 104 | if self._verbose > 1: print "retrieving previous reply, id = %d" % id
|
|---|
| 105 | reply = self._replies[id]
|
|---|
| 106 | del self._replies[id]
|
|---|
| 107 | return reply
|
|---|
| 108 | aid = abs(id)
|
|---|
| 109 | while 1:
|
|---|
| 110 | if self._verbose > 1: print "waiting for reply, id = %d" % id
|
|---|
| 111 | rp = pickle.Unpickler(self._rf)
|
|---|
| 112 | reply = rp.load()
|
|---|
| 113 | del rp
|
|---|
| 114 | if self._verbose > 1: print "got reply: %s" % repr(reply)
|
|---|
| 115 | rid = reply[2]
|
|---|
| 116 | arid = abs(rid)
|
|---|
| 117 | if arid == aid:
|
|---|
| 118 | if self._verbose > 1: print "got it"
|
|---|
| 119 | return reply
|
|---|
| 120 | self._replies[rid] = reply
|
|---|
| 121 | if arid > aid:
|
|---|
| 122 | if self._verbose > 1: print "got higher id, assume all ok"
|
|---|
| 123 | return (None, None, id)
|
|---|
| 124 |
|
|---|
| 125 | def _flush(self):
|
|---|
| 126 | self._wf.flush()
|
|---|
| 127 |
|
|---|
| 128 |
|
|---|
| 129 | from security import Security
|
|---|
| 130 |
|
|---|
| 131 |
|
|---|
| 132 | class SecureClient(Client, Security):
|
|---|
| 133 |
|
|---|
| 134 | def __init__(self, *args):
|
|---|
| 135 | import string
|
|---|
| 136 | apply(self._pre_init, args)
|
|---|
| 137 | Security.__init__(self)
|
|---|
| 138 | self._wf.flush()
|
|---|
| 139 | line = self._rf.readline()
|
|---|
| 140 | challenge = string.atoi(string.strip(line))
|
|---|
| 141 | response = self._encode_challenge(challenge)
|
|---|
| 142 | line = repr(long(response))
|
|---|
| 143 | if line[-1] in 'Ll': line = line[:-1]
|
|---|
| 144 | self._wf.write(line + '\n')
|
|---|
| 145 | self._wf.flush()
|
|---|
| 146 | self._post_init()
|
|---|
| 147 |
|
|---|
| 148 | class _stub:
|
|---|
| 149 |
|
|---|
| 150 | """Helper class for Client -- each instance serves as a method of the client."""
|
|---|
| 151 |
|
|---|
| 152 | def __init__(self, client, name):
|
|---|
| 153 | self._client = client
|
|---|
| 154 | self._name = name
|
|---|
| 155 |
|
|---|
| 156 | def __call__(self, *args):
|
|---|
| 157 | return self._client._vcall(self._name, args)
|
|---|
