add SQS consumer example

aws-sqs-consumer/main.py

@@ -0,0 +1,35 @@
+import boto3
+import dispatch
+
+sqs = boto3.resource('sqs')
+
+queue_name = 'dispatch-example-queue'
+queue = sqs.get_queue_by_name(QueueName=queue_name)
+
+
+# This worker consumes messages from the SQS queue and transfers them to
+# Dispatch for processing.
+@dispatch.worker
+def consume_messages():
+    while True:
+        messages = queue.receive_messages()
+        if not messages:
+            continue
+        batch = dispatch.batch()
+        for m in messages:
+            batch.add(handle_message, m.message_id, m.body)
+        batch.dispatch()
+        queue.delete_messages(Entries=[
+            {'Id': m.message_id, 'ReceiptHandle': m.receipt_handle} for m in messages
+        ])
+
+
+# This function processes messages consumed from SQS, applying the reliability
+# features of Dispatch such as retries, adaptive concurrency control, etc...
+@dispatch.function
+def handle_message(id: str, body: str):
+    print('processing message:', id, body)
+
+
+if __name__ == '__main__':
+    dispatch.run()