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lambda_function_monthlyusage.py

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+import boto3
+from datetime import datetime, timedelta
+
+def lambda_handler(event, context):
+    start_date = event.get('start_date')
+    end_date = event.get('end_date')
+
+    if not start_date or not end_date:
+        now = datetime.now()
+        first_day_this_month = datetime(now.year, now.month, 1)
+        first_day_last_month = (first_day_this_month - timedelta(days=1)).replace(day=1)
+        first_day_this_month_str = first_day_this_month.strftime('%Y-%m-%d')
+        first_day_last_month_str = first_day_last_month.strftime('%Y-%m-%d')
+        start_date = first_day_last_month_str
+        end_date = first_day_this_month_str  # Set to first day of current month (exclusive)
+
+    ce = boto3.client('ce')
+
+    response = ce.get_cost_and_usage(
+        TimePeriod={'Start': start_date, 'End': end_date},
+        Granularity='MONTHLY',
+        Metrics=['UnblendedCost'],
+        GroupBy=[
+            {'Type': 'TAG', 'Key': 'Tenant'},
+            {'Type': 'DIMENSION', 'Key': 'SERVICE'}
+        ]
+    )
+
+    results = []
+    for result in response['ResultsByTime']:
+        for group in result['Groups']:
+            tenant_key = group['Keys'][0] if group['Keys'][0] else ""
+            tenant = tenant_key.split('$', 1)[1] if '$' in tenant_key else tenant_key
+            if not tenant:
+                tenant = "_NoTag"
+            service = group['Keys'][1] if len(group['Keys']) > 1 else "Unknown"
+            cost_usd = float(group['Metrics']['UnblendedCost']['Amount'])
+            cost_usd_str = f"{cost_usd:.2f}".replace('.', ',')
+            results.append({
+                "Tenant": tenant,
+                "Service": service,
+                "Cost (USD)": cost_usd_str
+            })
+    return results