ceph/src/jaegertracing/thrift/contrib/zeromq/TZmqClient.py

   1 #
   2 # Licensed to the Apache Software Foundation (ASF) under one
   3 # or more contributor license agreements. See the NOTICE file
   4 # distributed with this work for additional information
   5 # regarding copyright ownership. The ASF licenses this file
   6 # to you under the Apache License, Version 2.0 (the
   7 # "License"); you may not use this file except in compliance
   8 # with the License. You may obtain a copy of the License at
   9 #
  10 #   http://www.apache.org/licenses/LICENSE-2.0
  11 #
  12 # Unless required by applicable law or agreed to in writing,
  13 # software distributed under the License is distributed on an
  14 # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  15 # KIND, either express or implied. See the License for the
  16 # specific language governing permissions and limitations
  17 # under the License.
  18 #
  19 import zmq
  20 from cStringIO import StringIO
  21 from thrift.transport.TTransport import TTransportBase, CReadableTransport
  22
  23
  24 class TZmqClient(TTransportBase, CReadableTransport):
  25     def __init__(self, ctx, endpoint, sock_type):
  26         self._sock = ctx.socket(sock_type)
  27         self._endpoint = endpoint
  28         self._wbuf = StringIO()
  29         self._rbuf = StringIO()
  30
  31     def open(self):
  32         self._sock.connect(self._endpoint)
  33
  34     def read(self, size):
  35         ret = self._rbuf.read(size)
  36         if len(ret) != 0:
  37             return ret
  38         self._read_message()
  39         return self._rbuf.read(size)
  40
  41     def _read_message(self):
  42         msg = self._sock.recv()
  43         self._rbuf = StringIO(msg)
  44
  45     def write(self, buf):
  46         self._wbuf.write(buf)
  47
  48     def flush(self):
  49         msg = self._wbuf.getvalue()
  50         self._wbuf = StringIO()
  51         self._sock.send(msg)
  52
  53     # Implement the CReadableTransport interface.
  54     @property
  55     def cstringio_buf(self):
  56         return self._rbuf
  57
  58     # NOTE: This will probably not actually work.
  59     def cstringio_refill(self, prefix, reqlen):
  60         while len(prefix) < reqlen:
  61             self.read_message()
  62             prefix += self._rbuf.getvalue()
  63         self._rbuf = StringIO(prefix)
  64         return self._rbuf