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How to use _remote_execute_and_forward method in fMBT

Best Python code snippet using fMBT_python

server.py

Source:server.py

...275    pythonshare._send(exec_msg, rns.to_remote)276    # _recv raises EOFError() if disconnected,277    # let it raise through.278    return pythonshare._recv(rns.from_remote)279def _remote_execute_and_forward(ns, exec_msg, to_client, peername=None):280    """returns (forward_status, info)281    forward_status values:282       True:  everything successfully forwarded,283              info contains pair (forwarded byte count, full length).284       False: not everything forwarded,285              info contains pair (forwarded byte count, full length).286              to_client file/socket is not functional.287       None:  no forwarding,288              info contains Exec_rv that should be sent normally.289    Raises EOFError if connection to remote namespace is not functional.290    The peername parameter is used for logging only.291    """292    client_supports_rv_info = exec_msg.recv_cap_data_info()293    exec_msg.set_recv_cap_data_info(True)294    rns = _g_remote_namespaces[ns]295    pythonshare._send(exec_msg, rns.to_remote)296    from_remote = rns.from_remote297    # Must keep simultaneously two locks:298    # - send lock on to_client299    # - recv lock on from_remote300    pythonshare._acquire_recv_lock(from_remote)301    try:302        response = pythonshare._recv(from_remote, acquire_recv_lock=False)303        if not isinstance(response, messages.Data_info):304            # Got direct response without forward mode305            return (None, response)306        pythonshare._acquire_send_lock(to_client)307        if client_supports_rv_info:308            # send data_info to client309            pythonshare._send(response, to_client, acquire_send_lock=False)310        try:311            if opt_debug and peername:312                daemon_log("%s:%s <= Exec_rv([forwarding %s B])" % (peername + (response.data_length,)))313            forwarded_bytes = pythonshare._forward(314                from_remote, to_client, response.data_length,315                acquire_recv_lock=False,316                acquire_send_lock=False)317            if forwarded_bytes == response.data_length:318                return (True, (forwarded_bytes, response.data_length))319            else:320                return (False, (forwarded_bytes, response.data_length))321        finally:322            pythonshare._release_send_lock(to_client)323    finally:324        exec_msg.set_recv_cap_data_info(client_supports_rv_info)325        pythonshare._release_recv_lock(from_remote)326def _connection_lost(conn_id, *closables):327    if closables:328        pythonshare._close(*closables)329    try:330        for ns in _g_namespace_users[conn_id]:331            try:332                _g_local_namespaces[ns]["pythonshare_ns"].call_on_disconnect(conn_id)333            except KeyError:334                pass335    except KeyError:336        pass337def _serve_connection(conn, conn_opts):338    global _g_async_rv_counter339    global _g_server_shutdown340    if isinstance(conn, client.Connection):341        to_client = conn._to_server342        from_client = conn._from_server343    else: # conn is a connected socket344        to_client = conn.makefile("w")345        from_client = conn.makefile("r")346    try:347        peername = conn.getpeername()348    except socket.error:349        peername = ("unknown", "?")350    if opt_debug:351        daemon_log("connected %s:%s" % peername)352    conn_id = "%s-%s" % (timestamp(), id(conn))353    auth_ok = False354    passwords = [k for k in conn_opts.keys() if k.startswith("password.")]355    kill_server_on_close = conn_opts.get("kill-server-on-close", False)356    if passwords:357        # password authentication is required for this connection358        received_password = pythonshare._recv(from_client)359        for password_type in passwords:360            algorithm = password_type.split(".")[1]361            if type(received_password) == str:362                if (algorithm == "plaintext" and363                    received_password == conn_opts[password_type]):364                    auth_ok = True365                elif (hasattr(hashlib, algorithm) and366                      getattr(hashlib, algorithm)(received_password).hexdigest() ==367                      conn_opts[password_type]):368                    auth_ok = True369        try:370            if auth_ok:371                pythonshare._send(messages.Auth_rv(True), to_client)372                if opt_debug:373                    daemon_log("%s:%s authentication ok" % peername)374            else:375                pythonshare._send(messages.Auth_rv(False), to_client)376                if opt_debug:377                    daemon_log("%s:%s authentication failed" % peername)378        except socket.error:379            daemon_log("authentication failed due to socket error")380            auth_ok = False381    else:382        auth_ok = True # no password required383    whitelist_local = conn_opts.get("whitelist_local", None)384    while auth_ok:385        try:386            obj = pythonshare._recv(from_client)387            if opt_debug:388                daemon_log("%s:%s => %s" % (peername + (obj,)))389        except (EOFError, pythonshare.socket.error):390            break391        if isinstance(obj, messages.Register_ns):392            try:393                _init_remote_namespace(obj.ns, conn, to_client, from_client)394                pythonshare._send(messages.Ns_rv(True), to_client)395                # from this point on, this connection is reserved for396                # sending remote namespace traffic. The connection will be397                # used by other threads, this thread stops here.398                return399            except Exception, e:400                pythonshare._send(messages.Ns_rv(False, exception2string(sys.exc_info())), to_client)401        elif isinstance(obj, messages.Drop_ns):402            try:403                if obj.ns in _g_local_namespaces:404                    _drop_local_namespace(obj.ns)405                elif obj.ns in _g_remote_namespaces:406                    _drop_remote_namespace(obj.ns)407                else:408                    raise ValueError('Unknown namespace "%s"' % (obj.ns,))409                pythonshare._send(messages.Ns_rv(True), to_client)410            except Exception, e:411                if opt_debug:412                    daemon_log("namespace drop error: %s" % (e,))413                pythonshare._send(messages.Ns_rv(False, exception2string(sys.exc_info())), to_client)414        elif isinstance(obj, messages.Request_ns):415            ns = obj.ns416            if (ns in _g_remote_namespaces or417                ns in _g_local_namespaces):418                _register_exported_namespace(ns, conn)419                pythonshare._send(messages.Ns_rv(True), to_client)420                # from this point on, this connection is reserved for421                # receiving executions on requested namespace. This422                # thread starts serving the connection.423        elif isinstance(obj, messages.Exec):424            ns = obj.namespace425            if ns in _g_remote_namespaces: # execute in remote namespace426                try:427                    _fwd_status, _fwd_info = _remote_execute_and_forward(428                        ns, obj, to_client, peername)429                    if _fwd_status == True:430                        # successfully forwarded431                        if opt_debug:432                            daemon_log("%s:%s forwarded %s B" % (peername + (_fwd_info[0],)))433                        exec_rv = None # return value fully forwarded434                    elif _fwd_status == False:435                        # connection to client is broken436                        if opt_debug:437                            daemon_log("%s:%s error after forwarding %s/%s B" % (peername + _fwd_info))438                        break439                    elif _fwd_status is None:440                        # nothing forwarded, send return value by normal means441                        exec_rv = _fwd_info...

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