#!/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 os
import optparse
import sys
import re
import socket
import qpid
from threading       import Condition
from qpid.qmfconsole import Session, Console
from qpid.peer       import Closed
from qpid.connection import Connection, ConnectionFailed
from qpid.util       import connect
from time            import sleep

class BrokerManager(Console):
  def __init__(self, host):
    self.url = host
    self.objects = {}
    self.filter  = None
    self.session = Session(self, rcvEvents=False, rcvHeartbeats=False, userBindings=True)
    try:
      self.broker  = self.session.addBroker(self.url)
    except socket.error, e:
      print "Socket Error %s - %s" % (e[0], e[1])
      sys.exit (1)
    except Closed, e:
      print "Connect Failed %d - %s" % (e[0], e[1])
      sys.exit (1)
    except ConnectionFailed, e:
      print "Connect Failed %d - %s" % (e[0], e[1])
      sys.exit(1)

  def setFilter(self,filter):
    self.filter = filter

  def objectProps(self, broker, record):
    className = record.getClassKey()[1]
    if className != "queue":
      return

    id = record.getObjectId().__repr__()
    if id not in self.objects:
      self.objects[id] = (record.name, None, None)

  def objectStats(self, broker, record):
    className = record.getClassKey()[1]
    if className != "queue":
      return

    id = record.getObjectId().__repr__()
    if id not in self.objects:
      return

    (name, first, last) = self.objects[id]
    if first == None:
      self.objects[id] = (name, record, None)
      return

    if len(self.filter) > 0 :
      match = False
                    
      for x in self.filter:
        if x.match(name):                 
          match = True
          break
        if match == False:
          return

    if last == None:
      lastSample = first
    else:
      lastSample = last

    self.objects[id] = (name, first, record)

    deltaTime   = float (record.getTimestamps()[0] - lastSample.getTimestamps()[0])
    enqueueRate = float (record.msgTotalEnqueues - lastSample.msgTotalEnqueues) / \
        (deltaTime / 1000000000.0)
    dequeueRate = float (record.msgTotalDequeues - lastSample.msgTotalDequeues) / \
        (deltaTime / 1000000000.0)
    print "%-41s%10.2f%11d%13.2f%13.2f" % \
        (name, deltaTime / 1000000000, record.msgDepth, enqueueRate, dequeueRate)


  def Display (self):
    classes = self.session.getClasses("org.apache.qpid.broker")
    for cls in classes:
      if cls[1] == "queue":
        queueClassKey = cls
    self.session.bindClass(queueClassKey)
    print "Queue Name                                     Sec       Depth     Enq Rate     Deq Rate"
    print "========================================================================================"
    try:
      while True:
        sleep (1)
    except KeyboardInterrupt:
      print
    self.session.delBroker(self.broker)

##
## Main Program
##
def main():
  p = optparse.OptionParser()
  p.add_option('--broker-address','-a', default='localhost' , help='broker-addr is in the form:  [username/password@] hostname | ip-address [:<port>] \n ex:  localhost, 10.1.1.7:10000, broker-host:10000, guest/guest@localhost')
  p.add_option('--filter','-f' ,default=None ,help='a list of comma separated queue names (regex are accepted) to show')

  options, arguments = p.parse_args()

  host = options.broker_address
  filter = []
  if options.filter != None:
    for s in options.filter.split(","):
        filter.append(re.compile(s))

  bm = BrokerManager(host)
  bm.setFilter(filter)
  bm.Display()
 
if __name__ == '__main__':
  main()