Adding intitial DynamoDB setup and implementing ListTables target

moto/dynamodb/responses.py

@@ -0,0 +1,32 @@
+import re
+import json
+from .models import dynamodb_backend
+
+class DynamoHandler(object):
+    
+    def __init__(self, uri, body, headers):
+        self.uri = uri
+        self.body = body
+        self.headers = headers
+
+    def get_method_name(self, headers):
+        """Parses request headers and extracts part od the X-Amz-Target
+        that corresponds to a method of DynamoHandler
+
+        ie: X-Amz-Target: DynamoDB_20111205.ListTables -> ListTables
+        """
+        match = re.search(r'X-Amz-Target: \w+\.(\w+)', headers)
+        return match.groups()[0]
+
+    def dispatch(self):
+        method = self.get_method_name(self.headers)
+        return getattr(self, method)(self.uri, self.body, self.headers)
+
+    def ListTables(self, uri, body, headers):
+        tables = dynamodb_backend.tables.keys()
+        response = {"TableNames": tables}
+        return json.dumps(response)
+    
+
+def handler(uri, body, headers):
+    return DynamoHandler(uri, body, headers).dispatch()