168 lines
6.0 KiB
Python
168 lines
6.0 KiB
Python
# Copyright (C) 2014 Srivats P.
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#
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# This file is part of "Ostinato"
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#
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# This is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>
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from google.protobuf.message import EncodeError, DecodeError
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from google.protobuf.service import RpcChannel
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from google.protobuf.service import RpcController
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import logging
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import socket
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import struct
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import sys
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class PeerClosedConnError(Exception):
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def __init__(self, msg):
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self.msg = msg
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def __str__(self):
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return self.msg
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class RpcError(Exception):
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def __init__(self, msg):
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self.msg = msg
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def __str__(self):
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return self.msg
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class RpcMismatchError(Exception):
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def __init__(self, msg, received, expected):
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self.msg = msg
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self.received = received
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self.expected = expected
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def __str__(self):
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return '%s - Expected method %d, Received method %d' % (
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self.msg, self.expected, self.received)
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class OstinatoRpcController(RpcController):
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def __init__(self):
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super(OstinatoRpcController, self).__init__()
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class OstinatoRpcChannel(RpcChannel):
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def __init__(self):
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self.log = logging.getLogger(__name__)
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self.log.debug('opening socket')
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def connect(self, host, port):
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self.peer = '%s:%d' % (host, port)
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self.log.debug('connecting to %s', self.peer)
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try:
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self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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self.sock.connect((host, port))
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except socket.error as e:
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error = 'ERROR: Unable to connect to Drone %s (%s)' % (
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self.peer, str(e))
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print(error)
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raise
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def disconnect(self):
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self.log.debug('closing socket')
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self.sock.close()
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def CallMethod(self, method, controller, request, response_class, done):
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MSG_HDR_SIZE = 8
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MSG_TYPE_REQUEST = 1
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MSG_TYPE_RESPONSE = 2
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MSG_TYPE_BLOB = 3
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MSG_TYPE_ERROR = 4
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error = ''
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try:
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self.log.info('invoking RPC %s(%s): %s', method.name,
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type(request).__name__, response_class.__name__)
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self.log.debug('serializing request arg %s', request)
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req = request.SerializeToString()
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hdr = struct.pack('>HHI', MSG_TYPE_REQUEST, method.index, len(req))
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self.log.debug('req.hdr = %r', hdr)
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self.sock.sendall(hdr + req)
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# receive and parse header
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self.log.debug('receiving response hdr')
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hdr = ''
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while len(hdr) < MSG_HDR_SIZE:
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chunk = self.sock.recv(MSG_HDR_SIZE - len(hdr))
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if chunk == '':
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raise PeerClosedConnError('connection closed by peer')
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hdr = hdr + chunk
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(msg_type, method_index, resp_len) = struct.unpack('>HHI', hdr)
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self.log.debug('resp hdr: type = %d, method = %d, len = %d',
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msg_type, method_index, resp_len)
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# receive and parse the actual response message
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self.log.debug('receiving response data')
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resp = ''
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while len(resp) < resp_len:
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chunk = self.sock.recv(resp_len - len(resp))
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if chunk == '':
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raise PeerClosedConnError('connection closed by peer')
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resp = resp + chunk
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# verify response method is same as the one requested
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if method_index != method.index:
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raise RpcMismatchError('RPC mismatch',
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expected = method.index, received = method_index)
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if msg_type == MSG_TYPE_RESPONSE:
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response = response_class()
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response.ParseFromString(resp)
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self.log.debug('parsed response %s', response)
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elif msg_type == MSG_TYPE_BLOB:
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response = resp
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elif msg_type == MSG_TYPE_ERROR:
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raise RpcError(unicode(resp, 'utf-8'))
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else:
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raise RpcError('unknown RPC msg type %d' % msg_type)
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controller.response = response
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except socket.error as e:
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error = 'ERROR: RPC %s() to Drone %s failed (%s)' % (
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method.name, self.peer, e)
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self.log.exception(error+e)
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raise
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except PeerClosedConnError as e:
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error = 'ERROR: Drone %s closed connection receiving reply ' \
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'for RPC %s() (%s)' % (
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self.peer, method.name, e)
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self.log.exception(error)
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raise
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except EncodeError as e:
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error = 'ERROR: Failed to serialize %s arg for RPC %s() ' \
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'to Drone %s (%s)' % (
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type(request).__name__, method.name, self.peer, e)
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self.log.exception(error)
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raise
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except DecodeError as e:
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error = 'ERROR: Failed to parse %s response for RPC %s() ' \
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'from Drone %s (%s)' % (
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type(response).__name__, method.name, self.peer, e)
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self.log.exception(error)
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raise
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except RpcMismatchError as e:
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error = 'ERROR: Rpc Mismatch for RPC %s() (%s)' % (
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method.name, e)
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self.log.exception(error)
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raise
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except RpcError as e:
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error = 'ERROR: error received for RPC %s() (%s) ' % (
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method.name, e)
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self.log.exception(error)
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raise
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finally:
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if error:
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print(error)
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