[RFR]This PR will add list_s3_bucket method and forcefully remove the Bucket. (#345)

* This PR will add `list_s3_bucket` method and forcefully remove the Bucket if it is not empty.

* Use existing object_delete and delete all fuctionality.

* Minor Updates: Object iterable check,Exception handled, Updated key Deletion.

* Updated code by taking list values in argument.

* Minor updates with exception and naming convention

* Fixed Bucket names instead of Bucket obj.

Author: sbulage

wrapanapi/systems/ec2.py

@@ -784,6 +784,9 @@ def create_s3_bucket(self, bucket_name):
             self.logger.exception("Error: Bucket was not successfully created.")
             return False
 
+    def list_s3_bucket_names(self):
+        return [bucket.name for bucket in self.s3_connection.buckets.all()]
+
     def upload_file_to_s3_bucket(self, bucket_name, file_path, file_name):
         bucket = self.s3_connection.Bucket(bucket_name)
         self.logger.info("uploading file '%s' to bucket: '%s'", file_path, bucket_name)
@@ -804,17 +807,26 @@ def object_exists_in_bucket(self, bucket_name, object_key):
         objects = [o for o in bucket.objects.all() if o.key == object_key]
         return any(objects)
 
-    def delete_s3_bucket(self, bucket_name):
-        """TODO: Force delete - delete all objects and then bucket"""
-        bucket = self.s3_connection.Bucket(bucket_name)
-        self.logger.info("Trying to delete bucket '%s'", bucket_name)
-        try:
-            bucket.delete()
-            self.logger.info("Success: bucket '%s' was deleted.", bucket_name)
-            return True
-        except Exception:
-            self.logger.exception("Bucket '%s' deletion failed", bucket_name)
-            return False
+    def delete_s3_buckets(self, bucket_names):
+        """ Deletes specified bucket(s) with keys """
+        deleted_list = []
+        if isinstance(bucket_names, (set, list, tuple)):
+            buckets = [self.s3_connection.Bucket(obj_name) for obj_name in bucket_names]
+        else:
+            raise ValueError("Object is not iterable.")
+        for bucket in buckets:
+            self.logger.info("Trying to delete bucket '%s'", bucket.anem)
+            keys = [obj.key for obj in bucket.objects.all()]
+            try:
+                if keys:
+                    self.delete_objects_from_s3_bucket(bucket.name, keys)
+                bucket.delete()
+                deleted_list.append(bucket.name)
+                self.logger.info("Success: bucket '%s' was deleted.", bucket.name)
+            except Exception as e:
+                self.logger.exception("Bucket '%s' deletion failed due to %s", bucket.name,
+                                      e.message)
+        return deleted_list
 
     def delete_objects_from_s3_bucket(self, bucket_name, object_keys):
         """Delete each of the given object_keys from the given bucket"""