From ebbe0a642401306d59409c631c53693ea7d80f6a Mon Sep 17 00:00:00 2001
From: KenF <kenf@dev.internal>
Date: Fri, 23 Jan 2026 17:03:29 +0800
Subject: [PATCH] feat: bucket size is now reported

---
 aws-s3.py | 41 +++++++++++++++++++++++++++++++++++++++--
 1 file changed, 39 insertions(+), 2 deletions(-)

diff --git a/aws-s3.py b/aws-s3.py
index b913209..291ba59 100755
--- a/aws-s3.py
+++ b/aws-s3.py
@@ -8,6 +8,43 @@ License: This program is released under the MIT License
 # Imports
 import boto3
 from openpyxl import load_workbook
+import datetime
+
+
+def getBucketSize(bucket: str) -> int:
+    """
+    Get size of a s3 bucket through cloudwatch metric
+
+    :param bucket:
+    :return: Bucket size in MiB
+    """
+    s3 = boto3.client('s3')
+    region = s3.get_bucket_location(Bucket=bucket)['LocationConstraint']
+    if region is None:
+        region='us-east-1'
+    cloudwatch_client = boto3.client('cloudwatch', region_name=region)
+    response = cloudwatch_client.get_metric_statistics(Namespace='AWS/S3',
+                                                       MetricName='BucketSizeBytes',
+                                                       Dimensions=[
+                                                           {
+                                                               'Name': 'BucketName',
+                                                               'Value': bucket
+                                                           },
+                                                           {
+                                                               'Name': 'StorageType',
+                                                               'Value': 'StandardStorage'
+                                                           }
+                                                       ],
+                                                       StartTime=datetime.datetime.now() - datetime.timedelta(
+                                                           days=7),
+                                                       EndTime=datetime.datetime.now(),
+                                                       Period=86400,
+                                                       Statistics=['Average']
+                                                       )
+    if len(response['Datapoints']) == 0:
+        return 0
+    else:
+        return int(response['Datapoints'][0]['Average']/1024/1024/1024)
 
 # Main function
 def main() -> None:
@@ -21,9 +58,9 @@ def main() -> None:
     response = s3_client.list_buckets()
 
     # Print the names of the buckets
-    ws.append(['Buckets'])
+    ws.append(['Buckets', 'SizeGiB'])
     for bucket in response['Buckets']:
-        ws.append([bucket["Name"]])
+        ws.append([bucket["Name"], getBucketSize(bucket["Name"])])
 
     wb.save('aws-inventory.xlsx')