Adds more brokers

* added IronMQ
* added Aws SQS
* removed SafeRedis.
 During tests the 'safe' part wasn't consistent enough

django_q/brokers/iron_mq.py

@@ -0,0 +1,38 @@
+from django_q.conf import Conf
+from django_q.brokers import Broker
+from iron_mq import IronMQ
+
+
+class IronMQBroker(Broker):
+
+    def enqueue(self, task):
+        return self.connection.post(task)['ids'][0]
+
+    def dequeue(self):
+        timeout = Conf.RETRY or None
+        task = self.connection.get(timeout=timeout, wait=1)['messages']
+        if task:
+            return task[0]['id'], task[0]['body']
+
+    def ping(self):
+        return self.connection.name == self.list_key
+
+    def queue_size(self):
+        return self.connection.size()
+
+    def delete_queue(self):
+        return self.connection.delete_queue()['msg']
+
+    def purge_queue(self):
+        return self.connection.clear()['msg']
+
+    def delete(self, task_id):
+        return self.connection.delete(task_id)['msg']
+
+    def acknowledge(self, task_id):
+        return self.delete(task_id)
+
+    @staticmethod
+    def get_connection(list_key=Conf.PREFIX):
+        ironmq = IronMQ(name=None, **Conf.IRONMQ)
+        return ironmq.queue(queue_name=list_key)