Aggiunto servizio RabbitMQ Client

bin-ubuntu/rabbitmq-client.py

+#!/usr/bin/env python3
+import pika
+import dbus
+from random import randint
+from time import sleep
+
+server_host = 'rabbitmq.edu-al.unipmn.it';
+server_port = 5672;
+server_username = 'labmanager-client';
+server_pwd = '3aB7=2zV9:1jN3-4hE2';
+server_vhost = 'labmanager';
+
+exchange_name = 'labmanager-test';
+exchange_type = 'x-recent-history'; # It's a plugin. Enable with 'rabbitmq-plugins enable rabbitmq_recent_history_exchange'
+
+systemd_getconfig_unit_name = 'esame-get-config.service'
+
+bus = dbus.SystemBus()
+systemd = bus.get_object(
+    'org.freedesktop.systemd1',
+    '/org/freedesktop/systemd1'
+)
+
+manager = dbus.Interface(
+    systemd,
+    'org.freedesktop.systemd1.Manager'
+)
+
+server_credentials = pika.PlainCredentials(server_username, server_pwd, True)
+
+while True:
+    try:
+
+        connection = pika.BlockingConnection(
+            pika.ConnectionParameters(
+                host=server_host,
+                port=server_port,
+                virtual_host=server_vhost,
+                credentials=server_credentials
+            )
+        )
+
+        channel = connection.channel()
+
+        '''
+        L'exchange lo dichiara il publisher
+        TODO: qui serve sapere se esiste gia' e in caso negativo aspettare e ripetere (valutare se usare passive=true)
+        '''
+        # channel.exchange_declare(exchange=exchange_name, exchange_type=exchange_type)
+
+        result = channel.queue_declare(queue='', exclusive=True)
+        queue_name = result.method.queue
+
+        channel.queue_bind(exchange=exchange_name, queue=queue_name)
+
+        print('Waiting for RabbitMQ messages')
+
+        def callback(ch, method, properties, body):
+            # Sleep a random number of seconds (between 1 and 10)
+            # to avoid all machines reboot at the same time
+            sleep(randint(1,10))
+            
+            print("RabbitMQ message: %s" % body.decode('UTF-8'))
+            start_unit = manager.StartUnit(systemd_getconfig_unit_name, 'fail')
+
+        channel.basic_consume(
+            queue=queue_name, on_message_callback=callback, auto_ack=True)
+
+        channel.start_consuming()
+
+    except pika.exceptions.ConnectionClosedByBroker:
+        break
+    # Don't recover on channel errors
+    except pika.exceptions.AMQPChannelError:
+        break
+    # Recover on all other connection errors
+    except pika.exceptions.AMQPConnectionError:
+        continue

systemd-ubuntu/esame-rabbitmq-client.service

+[Unit]
+Description=Esame - RabbitMQ client
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=oneshot
+ExecStart=/usr/bin/python3 /usr/libexec/labmanager/rabbitmq/rabbitmq-client.py
+
+[Install]
+WantedBy=esame.target esamekiosk.target esameshow.target graphical.target
\ No newline at end of file