Adds more brokers

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

django_q/brokers/aws_sqs.py

@@ -0,0 +1,57 @@
+import os
+from django_q.conf import Conf
+from django_q.brokers import Broker
+import boto.sqs
+from boto.sqs.message import Message
+
+
+class Sqs(Broker):
+    def __init__(self, list_key=Conf.PREFIX):
+        super().__init__(list_key)
+        self.queue = self.get_queue()
+
+    def enqueue(self, task):
+        m = Message()
+        m.set_body(task)
+        self.queue.write(m)
+        return m.id
+
+    def dequeue(self):
+        rs = self.queue.get_messages(visibility_timeout=Conf.RETRY or 30)
+        if rs:
+            m = rs[0]
+            return m.receipt_handle, m.get_body()
+
+    def acknowledge(self, task_id):
+        return self.delete(task_id)
+
+    def queue_size(self):
+        return self.queue.count()
+
+    def delete(self, task_id):
+        m = Message()
+        m.receipt_handle = task_id
+        return self.queue.delete_message(m)
+
+    def delete_queue(self):
+        self.connection.delete_queue(self.queue)
+
+    def purge_queue(self):
+        self.queue.purge()
+
+    def ping(self):
+        try:
+            self.connection.get_all_queues()
+            return True
+        except Exception as e:
+            raise e
+
+    @staticmethod
+    def get_connection(list_key=Conf.PREFIX):
+        conn = boto.sqs.connect_to_region(Conf.SQS['region'],
+                                          aws_access_key_id=Conf.SQS['aws_access_key_id'],
+                                          aws_secret_access_key=Conf.SQS['aws_secret_access_key'])
+        return conn
+
+    def get_queue(self):
+        return self.connection.create_queue(self.list_key)