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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.
#
"""Utilities used by the Examples"""
import errno
import logging
import re
import socket
import select
import time
import pyngus
LOG = logging.getLogger()
def get_host_port(server_address):
"""Parse the hostname and port out of the server_address."""
regex = re.compile(r"^amqp://([a-zA-Z0-9.]+)(:([\d]+))?$")
x = regex.match(server_address)
if not x:
raise Exception("Bad address syntax: %s" % server_address)
matches = x.groups()
host = matches[0]
port = int(matches[2]) if matches[2] else None
return host, port
def connect_socket(host, port, blocking=True):
"""Create a TCP connection to the server."""
addr = socket.getaddrinfo(host, port, socket.AF_INET, socket.SOCK_STREAM)
if not addr:
raise Exception("Could not translate address '%s:%s'"
% (host, str(port)))
my_socket = socket.socket(addr[0][0], addr[0][1], addr[0][2])
if not blocking:
my_socket.setblocking(0)
try:
my_socket.connect(addr[0][4])
except socket.error as e:
if e.errno != errno.EINPROGRESS:
raise
return my_socket
def server_socket(host, port, backlog=10):
"""Create a TCP listening socket for a server."""
addr = socket.getaddrinfo(host, port, socket.AF_INET, socket.SOCK_STREAM)
if not addr:
raise Exception("Could not translate address '%s:%s'"
% (host, str(port)))
my_socket = socket.socket(addr[0][0], addr[0][1], addr[0][2])
my_socket.setblocking(0) # 0=non-blocking
try:
my_socket.bind(addr[0][4])
my_socket.listen(backlog)
except socket.error as e:
if e.errno != errno.EINPROGRESS:
raise
return my_socket
def process_connection(connection, my_socket):
"""Handle I/O and Timers on a single Connection."""
if connection.closed:
return False
work = False
readfd = []
writefd = []
if connection.needs_input > 0:
readfd = [my_socket]
work = True
if connection.has_output > 0:
writefd = [my_socket]
work = True
timeout = None
deadline = connection.next_tick
if deadline:
work = True
now = time.time()
timeout = 0 if deadline <= now else deadline - now
if not work:
return False
readable, writable, ignore = select.select(readfd,
writefd,
[],
timeout)
if readable:
try:
pyngus.read_socket_input(connection, my_socket)
except Exception as e:
# treat any socket error as
LOG.error("Socket error on read: %s", str(e))
connection.close_input()
# make an attempt to cleanly close
connection.close()
connection.process(time.time())
if writable:
try:
pyngus.write_socket_output(connection, my_socket)
except Exception as e:
LOG.error("Socket error on write %s", str(e))
connection.close_output()
# this may not help, but it won't hurt:
connection.close()
return True
# Map the send callback status to a string
SEND_STATUS = {
pyngus.SenderLink.ABORTED: "Aborted",
pyngus.SenderLink.TIMED_OUT: "Timed-out",
pyngus.SenderLink.UNKNOWN: "Unknown",
pyngus.SenderLink.ACCEPTED: "Accepted",
pyngus.SenderLink.REJECTED: "REJECTED",
pyngus.SenderLink.RELEASED: "RELEASED",
pyngus.SenderLink.MODIFIED: "MODIFIED"
}
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