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#!/usr/bin/env python
#
# 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 optparse, sys, time
import statistics
from qpid.messaging import *
SECOND = 1000
TIME_SEC = 1000000000
op = optparse.OptionParser(usage="usage: %prog [options]", description="Drains messages from the specified address")
op.add_option("-b", "--broker", default="localhost:5672", type="str", help="url of broker to connect to")
op.add_option("-a", "--address", type="str", help="address to receive from")
op.add_option("--connection-options", default={}, help="options for the connection")
op.add_option("-m", "--messages", default=0, type="int", help="stop after N messages have been received, 0 means no limit")
op.add_option("--timeout", default=0, type="int", help="timeout in seconds to wait before exiting")
op.add_option("-f", "--forever", default=False, action="store_true", help="ignore timeout and wait forever")
op.add_option("--ignore-duplicates", default=False, action="store_true", help="Detect and ignore duplicates (by checking 'sn' header)")
op.add_option("--verify-sequence", default=False, action="store_true", help="Verify there are no gaps in the message sequence (by checking 'sn' header)")
op.add_option("--check-redelivered", default=False, action="store_true", help="Fails with exception if a duplicate is not marked as redelivered (only relevant when ignore-duplicates is selected)")
op.add_option("--capacity", default=1000, type="int", help="size of the senders outgoing message queue")
op.add_option("--ack-frequency", default=100, type="int", help="Ack frequency (0 implies none of the messages will get accepted)")
op.add_option("--tx", default=0, type="int", help="batch size for transactions (0 implies transaction are not used)")
op.add_option("--rollback-frequency", default=0, type="int", help="rollback frequency (0 implies no transaction will be rolledback)")
op.add_option("--print-content", type="str", default="yes", help="print out message content")
op.add_option("--print-headers", type="str", default="no", help="print out message headers")
op.add_option("--failover-updates", default=False, action="store_true", help="Listen for membership updates distributed via amq.failover")
op.add_option("--report-total", default=False, action="store_true", help="Report total throughput statistics")
op.add_option("--report-every", default=0, type="int", help="Report throughput statistics every N messages")
op.add_option("--report-header", type="str", default="yes", help="Headers on report")
op.add_option("--ready-address", type="str", help="send a message to this address when ready to receive")
op.add_option("--receive-rate", default=0, type="int", help="Receive at rate of N messages/second. 0 means receive as fast as possible")
#op.add_option("--help", default=False, action="store_true", help="print this usage statement")
def getTimeout(timeout, forever):
if forever:
return None
else:
return SECOND*timeout
EOS = "eos"
SN = "sn"
# Check for duplicate or dropped messages by sequence number
class SequenceTracker:
def __init__(self, opts):
self.opts = opts
self.lastSn = 0
# Return True if the message should be procesed, false if it should be ignored.
def track(self, message):
if not(self.opts.verify_sequence) or (self.opts.ignore_duplicates):
return True
sn = message.properties[SN]
duplicate = (sn <= lastSn)
dropped = (sn > lastSn+1)
if self.opts.verify_sequence and dropped:
raise Exception("Gap in sequence numbers %s-%s" %(lastSn, sn))
ignore = (duplicate and self.opts.ignore_duplicates)
if ignore and self.opts.check_redelivered and (not msg.redelivered):
raise Exception("duplicate sequence number received, message not marked as redelivered!")
if not duplicate:
lastSn = sn
return (not(ignore))
def main():
opts, args = op.parse_args()
if not opts.address:
raise Exception("Address must be specified!")
broker = opts.broker
address = opts.address
connection = Connection(opts.broker, **opts.connection_options)
try:
connection.open()
if opts.failover_updates:
auto_fetch_reconnect_urls(connection)
session = connection.session(transactional=(opts.tx))
receiver = session.receiver(opts.address)
if opts.capacity > 0:
receiver.capacity = opts.capacity
msg = Message()
count = 0
txCount = 0
sequenceTracker = SequenceTracker(opts)
timeout = getTimeout(opts.timeout, opts.forever)
done = False
stats = statistics.ThroughputAndLatency()
reporter = statistics.Reporter(opts.report_every, opts.report_header == "yes", stats)
if opts.ready_address is not None:
session.sender(opts.ready_address).send(msg)
if opts.tx > 0:
session.commit()
# For receive rate calculation
start = time.time()*TIME_SEC
interval = 0
if opts.receive_rate > 0:
interval = TIME_SEC / opts.receive_rate
replyTo = {} # a dictionary of reply-to address -> sender mapping
while (not done):
try:
msg = receiver.fetch(timeout=timeout)
reporter.message(msg)
if sequenceTracker.track(msg):
if msg.content == EOS:
done = True
else:
count+=1
if opts.print_headers == "yes":
if msg.subject is not None:
print "Subject: %s" %msg.subject
if msg.reply_to is not None:
print "ReplyTo: %s" %msg.reply_to
if msg.correlation_id is not None:
print "CorrelationId: %s" %msg.correlation_id
if msg.user_id is not None:
print "UserId: %s" %msg.user_id
if msg.ttl is not None:
print "TTL: %s" %msg.ttl
if msg.priority is not None:
print "Priority: %s" %msg.priority
if msg.durable:
print "Durable: true"
if msg.redelivered:
print "Redelivered: true"
print "Properties: %s" %msg.properties
print
if opts.print_content == "yes":
print msg.content
if (opts.messages > 0) and (count >= opts.messages):
done = True
# end of "if sequenceTracker.track(msg):"
if (opts.tx > 0) and (count % opts.tx == 0):
txCount+=1
if (opts.rollback_frequency > 0) and (txCount % opts.rollback_frequency == 0):
session.rollback()
else:
session.commit()
elif (opts.ack_frequency > 0) and (count % opts.ack_frequency == 0):
session.acknowledge()
if msg.reply_to is not None: # Echo message back to reply-to address.
if msg.reply_to not in replyTo:
replyTo[msg.reply_to] = session.sender(msg.reply_to)
replyTo[msg.reply_to].capacity = opts.capacity
replyTo[msg.reply_to].send(msg)
if opts.receive_rate > 0:
delay = start + count*interval - time.time()*TIME_SEC
if delay > 0:
time.sleep(delay)
# Clear out message properties & content for next iteration.
msg = Message()
except Empty: # no message fetched => break the while cycle
break
# end of while cycle
if opts.report_total:
reporter.report()
if opts.tx > 0:
txCount+=1
if opts.rollback_frequency and (txCount % opts.rollback_frequency == 0):
session.rollback()
else:
session.commit()
else:
session.acknowledge()
session.close()
connection.close()
except Exception,e:
print e
connection.close()
if __name__ == "__main__": main()
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