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Edit File : client.py \| Size : 4.60 KB
"""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) Back

Edit File : client.py | Size : 4.60 KB

"""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)

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