Short-circuit before building a query we don't use

aws/cloudwatch-log-costs.py

@@ -23,6 +23,8 @@ queries = []
 paginator = cw.get_paginator("list_metrics")
 for page in paginator.paginate(Namespace="AWS/Logs", MetricName="IncomingBytes"):
     for metric in page["Metrics"]:
+        if not metric["Dimensions"]:
+            continue
         query = {
             "Id": f"q{n}",
             "MetricStat": {
@@ -35,8 +37,6 @@ for page in paginator.paginate(Namespace="AWS/Logs", MetricName="IncomingBytes")
                 "Stat": "Sum",
             },
         }
-        if not metric["Dimensions"]:
-            continue
         query_names[f"q{n}"] = metric["Dimensions"][0]["Value"]
         n = n + 1
         queries.append(query)
@@ -62,13 +62,12 @@ for data_page in data_paginator.paginate(
 results.sort(key=lambda x: x["IncomingBytes"], reverse=True)
 
 incoming_bytes_total = 0
-
 for result in results:
     incoming_bytes_total += result["IncomingBytes"]
     print("{LogGroup}: {IncomingBytes}".format(**result))
 
-# CloudWatch logs: 5GiB free ingestion then $0.50 / GiB
 # Estimate a monthly cost by doubling the incoming_bytes counted over the last 14 days
 incoming_gb = 2 * incoming_bytes_total / (1024 * 1024 * 1024)
+# CloudWatch logs: 5GiB free ingestion then $0.50 / GiB
 cost = (incoming_gb - 5.0) * 0.5
 print(f"Estimated monthly cost: ${cost:.2f}")