add method describe_clusters for service ecs

moto/ecs/models.py

@@ -117,6 +117,20 @@ class EC2ContainerServiceBackend(BaseBackend):
         """
         return [cluster.arn for cluster in self.clusters.values()]
 
+    def describe_clusters(self, list_clusters_name=None):
+        list_clusters = []
+        if list_clusters_name is None:
+            if 'default' in self.clusters:
+                list_clusters.append(self.clusters['default'].response_object)
+        else:
+            for cluster in list_clusters_name:
+                cluster_name = cluster.split('/')[-1]
+                if cluster_name in self.clusters:
+                    list_clusters.append(self.clusters[cluster_name].response_object)
+                else:
+                    raise Exception("{0} is not a cluster".format(cluster_name))
+        return list_clusters
+
     def delete_cluster(self, cluster_str):
         cluster_name = cluster_str.split('/')[-1]
         if cluster_name in self.clusters:

moto/ecs/responses.py

@@ -35,6 +35,14 @@ class EC2ContainerServiceResponse(BaseResponse):
             'nextToken': str(uuid.uuid1())
         })
 
+    def describe_clusters(self):
+        list_clusters_name = self._get_param('clusters')
+        clusters = self.ecs_backend.describe_clusters(list_clusters_name)
+        return json.dumps({
+            'clusters': clusters,
+            'failures': []
+        })
+
     def delete_cluster(self):
         cluster_str = self._get_param('cluster')
         cluster = self.ecs_backend.delete_cluster(cluster_str)