#!/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 qmf.console     import Session, Console
from qpid.peer       import Closed
from qpid.connection import Connection, ConnectionFailed
from time            import sleep

class BrokerManager(Console):
  def __init__(self, host, conn_options):
    self.url = host
    self.objects = {}
    self.filter  = None
    self.session = Session(self, rcvEvents=False, rcvHeartbeats=False,
                           userBindings=True, manageConnections=True)
    self.broker  = self.session.addBroker(self.url, **conn_options)
    self.firstError = True

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

  def brokerConnected(self, broker):
    if not self.firstError:
      print "*** Broker connected"
    self.firstError = False

  def brokerDisconnected(self, broker):
    print "*** Broker connection lost - %s, retrying..." % broker.getError()
    self.firstError = False
    self.objects.clear()

  def objectProps(self, broker, record):
    className = record.getClassKey().getClassName()
    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().getClassName()
    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])
    if deltaTime < 1000000000.0:
      return
    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)
    sys.stdout.flush()


  def Display (self):
    self.session.bindClass("org.apache.qpid.broker", "queue")
    print "Queue Name                                     Sec       Depth     Enq Rate     Deq Rate"
    print "========================================================================================"
    sys.stdout.flush()
    try:
      while True:
        sleep (1)
        if self.firstError and self.broker.getError():
          self.firstError = False
          print "*** Error: %s, retrying..." % self.broker.getError()
    except KeyboardInterrupt:
      print
    self.session.delBroker(self.broker)

def main(argv=None):
  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')
  p.add_option("--sasl-mechanism", action="store", type="string", metavar="<mech>", help="SASL mechanism for authentication (e.g. EXTERNAL, ANONYMOUS, PLAIN, CRAM-MD5, DIGEST-MD5, GSSAPI). SASL automatically picks the most secure available mechanism - use this option to override.")
  p.add_option("--sasl-service-name", action="store", type="string", help="SASL service name to use")
  p.add_option("--ssl-certificate", action="store", type="string", metavar="<cert>", help="Client SSL certificate (PEM Format)")
  p.add_option("--ssl-key", action="store", type="string", metavar="<key>", help="Client SSL private key (PEM Format)")

  options, arguments = p.parse_args(args=argv)

  conn_options = {}
  if options.sasl_mechanism:
    conn_options['mechanisms'] = options.sasl_mechanism
  if options.sasl_service_name:
    conn_options['service'] = options.sasl_service_name
  if options.ssl_certificate:
    conn_options['ssl_certfile'] = options.ssl_certificate
  if options.ssl_key:
    if not options.ssl_certificate:
      p.error("missing '--ssl-certificate' (required by '--ssl-key')")
    conn_options['ssl_keyfile'] = options.ssl_key

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

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