cmactivationrmq.py

   1 # Copyright 2019 Nokia
   2
   3 # Licensed under the Apache License, Version 2.0 (the "License");
   4 # you may not use this file except in compliance with the License.
   5 # You may obtain a copy of the License at
   6 #
   7 #     http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14 from __future__ import print_function
  15 import logging
  16 import pika
  17
  18 from cmframework.apis import cmerror
  19 from cmframework.utils import cmactivationwork
  20
  21
  22 class CMActivationRMQ(object):
  23     EXCHANGE = 'cmframework.activator'
  24
  25     def __init__(self, host, port):
  26         try:
  27             self.host = host
  28             self.port = port
  29             self.connection = pika.BlockingConnection(
  30                 pika.ConnectionParameters(host=self.host, port=self.port))
  31             self.channel = self.connection.channel()
  32             self.channel.exchange_declare(exchange=CMActivationRMQ.EXCHANGE, type='direct')
  33         except Exception as exp:  # pylint: disable=broad-except
  34             raise cmerror.CMError(str(exp))
  35
  36
  37 class CMActivationRMQPublisher(CMActivationRMQ):
  38     def __init__(self, host, port):
  39         CMActivationRMQ.__init__(self, host, port)
  40
  41     def send(self, work):
  42         try:
  43             data = work.serialize()
  44             self.channel.basic_publish(exchange=CMActivationRMQ.EXCHANGE,
  45                                        routing_key=work.get_target(),
  46                                        body=data)
  47             logging.debug('Sent %s to activation exchange', str(work))
  48         except Exception as exp:  # pylint: disable=broad-except
  49             self.connection.close()
  50             raise cmerror.CMError(str(exp))
  51
  52
  53 class CMActivationRMQConsumer(CMActivationRMQ):
  54     class WorkConsumer(object):
  55         # pylint: disable=no-self-use, unused-argument
  56         def consume(self, work):
  57             raise cmerror.CMError('Not implemented')
  58
  59     def __init__(self, host, port, consumer, node):
  60         CMActivationRMQ.__init__(self, host, port)
  61         self.node = node
  62         result = self.channel.queue_declare(exclusive=True)
  63         self.queue_name = result.method.queue
  64         self.channel.queue_bind(exchange=CMActivationRMQ.EXCHANGE, queue=self.queue_name,
  65                                 routing_key=node)
  66         self.channel.queue_bind(exchange=CMActivationRMQ.EXCHANGE, queue=self.queue_name,
  67                                 routing_key='all')
  68         self.channel.basic_consume(self,
  69                                    queue=self.queue_name,
  70                                    no_ack=True)
  71         self.consumer = consumer
  72
  73     def __call__(self, ch, method, properties, body):
  74         logging.debug('Received %r', body)
  75         work = cmactivationwork.CMActivationWork()
  76         work.deserialize(body)
  77         self.consumer.consume(work)
  78
  79     def receive(self):
  80         try:
  81             self.channel.start_consuming()
  82         except Exception as exp:  # pylint: disable=broad-except
  83             self.connection.close()
  84             raise cmerror.CMError(str(exp))
  85
  86
  87 def main():
  88     import sys
  89     import argparse
  90
  91     class MyConsumer(CMActivationRMQConsumer.WorkConsumer):
  92         def consume(self, work):
  93             print('Got work %s' % work)
  94
  95     parser = argparse.ArgumentParser(description='Test rabbitmq activator', prog=sys.argv[0])
  96     parser.add_argument('--role', required=True, action='store')
  97     parser.add_argument('--host', required=True, action='store')
  98     parser.add_argument('--port', required=True, type=int, action='store')
  99     parser.add_argument('--operation', required=False, type=int, action='store')
 100     parser.add_argument('--csn', required=False, type=int, action='store')
 101     parser.add_argument('--node', required=True, type=str, action='store')
 102     parser.add_argument('--properties', required=False, nargs=2, action='append')
 103     args = parser.parse_args(sys.argv[1:])
 104     if args.role == 'publisher':
 105         if not args.operation or not args.csn or not args.properties:
 106             print('Missing options')
 107             sys.exit(1)
 108         publisher = CMActivationRMQPublisher(args.host, args.port)
 109         props = {}
 110         for prop in args.properties:
 111             props[prop[0]] = prop[1]
 112         work = cmactivationwork.CMActivationWork(args.operation, args.csn, props)
 113         publisher.send(work)
 114     elif args.role == 'consumer':
 115         myconsumer = MyConsumer()
 116         consumer = CMActivationRMQConsumer(args.host, args.port, myconsumer, args.node)
 117         consumer.receive()
 118     else:
 119         print('Invalid role %s' % args.role)
 120         sys.exit(1)
 121
 122
 123 if __name__ == '__main__':
 124     main()