120 lines
3.9 KiB
Python
120 lines
3.9 KiB
Python
# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""helper methods that provide boilerplate socket I/O and Connection
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processing.
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"""
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__all__ = [
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"read_socket_input",
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"write_socket_output"
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]
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import errno
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import logging
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import socket
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from pyngus.connection import Connection
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LOG = logging.getLogger(__name__)
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def read_socket_input(connection, socket_obj):
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"""Read from the network layer and processes all data read. Can
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support both blocking and non-blocking sockets.
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Returns the number of input bytes processed, or EOS if input processing
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is done. Any exceptions raised by the socket are re-raised.
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"""
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count = connection.needs_input
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if count <= 0:
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return count # 0 or EOS
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while True:
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try:
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sock_data = socket_obj.recv(count)
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break
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except socket.timeout as e:
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LOG.debug("Socket timeout exception %s", str(e))
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raise # caller must handle
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except socket.error as e:
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err = e.errno
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if err in [errno.EAGAIN,
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errno.EWOULDBLOCK,
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errno.EINTR]:
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# try again later
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return 0
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# otherwise, unrecoverable, caller must handle
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LOG.debug("Socket error exception %s", str(e))
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raise
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except Exception as e: # beats me... assume fatal
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LOG.debug("unknown socket exception %s", str(e))
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raise # caller must handle
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if len(sock_data) > 0:
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count = connection.process_input(sock_data)
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else:
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LOG.debug("Socket closed")
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count = Connection.EOS
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connection.close_input()
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connection.close_output()
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return count
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def write_socket_output(connection, socket_obj):
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"""Write data to the network layer. Can support both blocking and
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non-blocking sockets.
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Returns the number of output bytes sent, or EOS if output processing
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is done. Any exceptions raised by the socket are re-raised.
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"""
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count = connection.has_output
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if count <= 0:
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return count # 0 or EOS
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data = connection.output_data()
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if not data:
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# error - has_output > 0, but no data?
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return Connection.EOS
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while True:
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try:
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count = socket_obj.send(data)
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break
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except socket.timeout as e:
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LOG.debug("Socket timeout exception %s", str(e))
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raise # caller must handle
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except socket.error as e:
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err = e.errno
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if err in [errno.EAGAIN,
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errno.EWOULDBLOCK,
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errno.EINTR]:
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# try again later
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return 0
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# else assume fatal let caller handle it:
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LOG.debug("Socket error exception %s", str(e))
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raise
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except Exception as e: # beats me... assume fatal
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LOG.debug("unknown socket exception %s", str(e))
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raise
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if count > 0:
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connection.output_written(count)
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elif data:
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LOG.debug("Socket closed")
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count = Connection.EOS
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connection.close_output()
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connection.close_input()
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return count
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