Connection.py
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"""
Associate a physical transport layer with a protocol.
Author: Georg Hopp <ghopp@spamtitan.com>
"""
from EndPoint import CommunicationEndPoint
from Transport import Transport
class Connection(CommunicationEndPoint):
_EVENTS = { 'new_con' : 0x01 }
def __init__(self, transport, protocol, read_chunk_size=8192):
super(Connection, self).__init__(transport, protocol, read_chunk_size)
self._current_msg = None
self._read_buffer = ''
self._write_buffer = ''
def hasPendingData(self):
return '' != self._write_buffer
def __iter__(self):
return self
def next(self):
"""
iterate through all available data and return all messages that can
be created from it. This is destructive for data.
"""
if not self._current_msg or self._current_msg.ready():
self._current_msg = self._protocol.createMessage(
self.getTransport().remote)
end = self._protocol.getParser().parse(
self._current_msg, self._read_buffer)
if 0 == end:
raise StopIteration
self._read_buffer = self._read_buffer[end:]
if not self._current_msg.ready():
raise StopIteration
return self._current_msg
def compose(self, message):
try:
self._write_buffer += self._protocol.getComposer().compose(message)
except Exception:
return False
return True
def appendReadData(self, data_remote):
self._read_buffer += data_remote[0]
def nextWriteData(self):
buf = self._write_buffer
self._write_buffer = ''
return (buf, None)
def appendWriteData(self, data_remote):
self._write_buffer += data_remote[0]
# vim: set ft=python et ts=8 sw=4 sts=4: