def main(): parser = ArgumentParser(description="Simple AMS example of subscription pull/consume") parser.add_argument('--host', type=str, default='messaging-devel.argo.grnet.gr', help='FQDN of AMS Service') parser.add_argument('--token', type=str, required=True, help='Given token') parser.add_argument('--project', type=str, required=True, help='Project registered in AMS Service') parser.add_argument('--subscription', type=str, required=True, help='Subscription name') parser.add_argument('--topic', type=str, required=True, help='Given topic') parser.add_argument('--nummsgs', type=int, default=3, help='Number of messages to pull and ack') parser.add_argument('--schema', type=str, required=True, help='Avro schema') parser.add_argument('--outfile', type=str, required=True, help='Output avro file') args = parser.parse_args() # initialize service with given token and project ams = ArgoMessagingService(endpoint=args.host, token=args.token, project=args.project) # ensure that subscription is created in first run. messages can be # pulled from the subscription only when subscription already exists # for given topic prior messages being published to topic try: if not ams.has_sub(args.subscription): ams.create_sub(args.subscription, args.topic) subscription = ams.get_sub(args.subscription, retobj=True) except AmsException as e: print(e) raise SystemExit(1) # try to pull number of messages from subscription. method will # return (ackIds, AmsMessage) tuples from which ackIds and messages # payload will be extracted. avro_payloads = list() for msg in subscription.pullack(args.nummsgs, retry=5, retrysleep=15, return_immediately=True): data = msg.get_data() msgid = msg.get_msgid() print('msgid={0}'.format(msgid)) avro_payloads.append(data) try: schema = load_schema(args.schema) if os.path.exists(args.outfile): avroFile = open(args.outfile, 'a+') writer = DataFileWriter(avroFile, DatumWriter()) else: avroFile = open(args.outfile, 'w+') writer = DataFileWriter(avroFile, DatumWriter(), schema) for am in avro_payloads: msg = avro_deserialize(am, args.schema) writer.append(msg) writer.close() avroFile.close() except Exception as e: print(e) raise SystemExit(1)
def main(): parser = ArgumentParser( description="Simple AMS example of subscription pull/consume") parser.add_argument('--host', type=str, default='messaging-devel.argo.grnet.gr', help='FQDN of AMS Service') parser.add_argument('--token', type=str, required=True, help='Given token') parser.add_argument('--project', type=str, required=True, help='Project registered in AMS Service') parser.add_argument('--subscription', type=str, required=True, help='Subscription name') parser.add_argument('--topic', type=str, required=True, help='Topic name') parser.add_argument('--push', type=str, required=False, default=None, help='Topic name') args = parser.parse_args() # initialize service with given token and project try: ams = ArgoMessagingService(endpoint=args.host, token=args.token, project=args.project) sub = ams.get_sub(args.subscription, retobj=True) print sub.push_endpoint sub.pushconfig_sub(push_endpoint=args.push) sub1 = ams.get_sub(args.subscription, retobj=True) print sub1.push_endpoint except AmsException as e: print e raise SystemExit(1)