mirror of
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65 lines
1.4 KiB
Python
65 lines
1.4 KiB
Python
#!/usr/bin/env python
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import socket
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try:
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from cStringIO import StringIO
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except ImportError, e:
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from StringIO import StringIO
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from struct import unpack
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from __init__ import dumps, loads
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def _bintoint(data):
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return unpack("<i", data)[0]
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def _sendobj(self, obj):
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"""
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Atomically send a BSON message.
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"""
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data = dumps(obj)
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self.sendall(data)
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def _recvobj(self):
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"""
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Atomic read of a BSON message.
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This function either returns a dict, None, or raises a socket error.
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If the return value is None, it means the socket is closed by the other side.
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"""
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sock_buf = self.recvbytes(4)
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if sock_buf is None:
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return None
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message_length = _bintoint(sock_buf.getvalue())
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sock_buf = self.recvbytes(message_length - 4, sock_buf)
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if sock_buf is None:
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return None
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retval = loads(sock_buf.getvalue())
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return retval
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def _recvbytes(self, bytes_needed, sock_buf = None):
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"""
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Atomic read of bytes_needed bytes.
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This function either returns exactly the nmber of bytes requested in a
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StringIO buffer, None, or raises a socket error.
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If the return value is None, it means the socket is closed by the other side.
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"""
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if sock_buf is None:
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sock_buf = StringIO()
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bytes_count = 0
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while bytes_count < bytes_needed:
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chunk = self.recv(min(bytes_needed - bytes_count, 32768))
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part_count = len(chunk)
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if part_count < 1:
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return None
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bytes_count += part_count
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sock_buf.write(chunk)
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return sock_buf
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