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#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
#
import socket
from qpid.util import connect
TRANSPORTS = {}
class SocketTransport:
def __init__(self, conn, host, port):
self.socket = connect(host, port)
if conn.tcp_nodelay:
self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
def fileno(self):
return self.socket.fileno()
class tcp(SocketTransport):
def reading(self, reading):
return reading
def writing(self, writing):
return writing
def send(self, bytes):
return self.socket.send(bytes)
def recv(self, n):
return self.socket.recv(n)
def close(self):
self.socket.close()
TRANSPORTS["tcp"] = tcp
try:
from ssl import wrap_socket, SSLError, SSL_ERROR_WANT_READ, \
SSL_ERROR_WANT_WRITE
except ImportError:
pass
else:
class tls(SocketTransport):
def __init__(self, conn, host, port):
SocketTransport.__init__(self, conn, host, port)
self.tls = wrap_socket(self.socket)
self.socket.setblocking(0)
self.state = None
def reading(self, reading):
if self.state is None:
return reading
else:
return self.state == SSL_ERROR_WANT_READ
def writing(self, writing):
if self.state is None:
return writing
else:
return self.state == SSL_ERROR_WANT_WRITE
def send(self, bytes):
self._clear_state()
try:
return self.tls.write(bytes)
except SSLError, e:
if self._update_state(e.args[0]):
return 0
else:
raise
def recv(self, n):
self._clear_state()
try:
return self.tls.read(n)
except SSLError, e:
if self._update_state(e.args[0]):
return None
else:
raise
def _clear_state(self):
self.state = None
def _update_state(self, code):
if code in (SSL_ERROR_WANT_READ, SSL_ERROR_WANT_WRITE):
self.state = code
return True
else:
return False
def close(self):
self.socket.setblocking(1)
# this closes the underlying socket
self.tls.close()
TRANSPORTS["ssl"] = tls
TRANSPORTS["tcp+tls"] = tls
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