transpub/Spectrum2/iochannel.py

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# use unicode encoding for all literals by default (for python2.x)
from __future__ import unicode_literals
__author__ = "Steffen Vogel"
__copyright__ = "Copyright 2015-2017, Steffen Vogel"
__license__ = "GPLv3"
__maintainer__ = "Steffen Vogel"
__email__ = "post@steffenvogel.de"
"""
This file is part of transWhat
transWhat is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
any later version.
transwhat is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with transWhat. If not, see <http://www.gnu.org/licenses/>.
"""
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import asyncore, socket
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import logging
import sys
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class IOChannel(asyncore.dispatcher):
def __init__(self, host, port, callback, closeCallback):
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asyncore.dispatcher.__init__(self)
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
self.connect((host, port))
self.logger = logging.getLogger(self.__class__.__name__)
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self.callback = callback
self.closeCallback = closeCallback
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self.buffer = bytes("")
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def sendData(self, data):
self.buffer += data
def handle_connect(self):
pass
def handle_close(self):
self.close()
def handle_read(self):
data = self.recv(65536)
self.callback(data)
def handle_write(self):
sent = self.send(self.buffer)
self.buffer = self.buffer[sent:]
def handle_close(self):
self.logger.info('Connection to backend closed, terminating.')
self.close()
self.closeCallback()
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def writable(self):
return (len(self.buffer) > 0)
def readable(self):
return True