78 lines
2.5 KiB
Python
78 lines
2.5 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.service import RpcChannel
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from google.protobuf.service import RpcController
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import socket
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import struct
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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.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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def connect(self, host, port):
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self.sock.connect((host, port))
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def disconnect(self):
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self.sock.close()
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def CallMethod(self, method, controller, request, response_class, done):
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OST_PB_MSG_HDR_SIZE = 8
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OST_PB_MSG_TYPE_REQUEST = 1
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OST_PB_MSG_TYPE_RESPONSE = 2
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OST_PB_MSG_TYPE_BLOB = 3
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req = request.SerializeToString()
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self.sock.sendall(struct.pack('>HHI',
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OST_PB_MSG_TYPE_REQUEST, method.index, len(req)) + req)
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# receive and parse header
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hdr = ''
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while len(hdr) < OST_PB_MSG_HDR_SIZE:
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chunk = self.sock.recv(OST_PB_MSG_HDR_SIZE - len(hdr))
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if chunk == '':
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raise RuntimeError("socket connection broken")
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hdr = hdr + chunk
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(type, method, resp_len) = struct.unpack('>HHI', hdr)
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# receive and parse the actual response message
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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 RuntimeError("socket connection broken")
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resp = resp + chunk
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if type == OST_PB_MSG_TYPE_RESPONSE:
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response = response_class()
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response.ParseFromString(resp)
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elif type == OST_PB_MSG_TYPE_BLOB:
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response = resp
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else:
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print 'unsupported msg type %d received in respone to %s' % \
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type, method.name
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controller.response = response
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