SONARPY-3049: Create rule S6243: AWS clients should be reused across Lambda invocations #5148
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S6243 has the title "Reusable resources should be initialized at construction time of Lambda functions"
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| "extra": { | ||
| "replacementRules": [ | ||
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| ], | ||
| "legacyKeys": [ | ||
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| ] | ||
| }, |
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The add language GH action moved the java metadata.json a level up so it can be shared. If you're question is about the extra key, I'm not sure either. However, I didn't want to touch it, since something might need it
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I was referring to the extra key, Not sure why it is there
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Searching through the rspec repo, it's far from the only rule with the "extra" key. There are also quite a few rules with pretty much the same JSON block. So maybe it was once part of the template, but I couldn't trace it in the rspec repository
rules/S6243/python/rule.adoc
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| This rule raises when resources are recreated on every Lambda function invocation instead of being reused. | |||
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| This rule raises when resources are recreated on every Lambda function invocation instead of being reused. | |
| This rule raises an issue when resources are recreated on every Lambda function invocation instead of being reused. |
I like the other way of saying it, but no strong feeling
rules/S6243/python/rule.adoc
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| Availability risks may also emerge under high load scenarios, as the additional overhead from resource recreation can cause functions to timeout more frequently or hit concurrency limits sooner than necessary. | ||
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| Increased AWS service API throttling is another potential issue, as recreating resources may lead to more frequent authentication requests and connection establishments, potentially triggering rate limits. |
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The rule is generic, so not just AWS services
rules/S6243/python/rule.adoc
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| ==== Noncompliant code example | ||
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| [source,python,diff-id=1,diff-type=noncompliant] | ||
| ---- | ||
| import boto3 | ||
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| def lambda_handler(event, context): | ||
| s3_client = boto3.client('s3') # Noncompliant: Client created inside handler | ||
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| response = s3_client.get_object( | ||
| Bucket='my-bucket', | ||
| Key='my-key' | ||
| ) | ||
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| return { | ||
| 'statusCode': 200, | ||
| 'body': response['Body'].read() | ||
| } | ||
| ---- | ||
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| ==== Compliant solution | ||
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| [source,python,diff-id=1,diff-type=compliant] | ||
| ---- | ||
| import boto3 | ||
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| s3_client = boto3.client('s3') # Compliant | ||
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| def lambda_handler(event, context): | ||
| response = s3_client.get_object( | ||
| Bucket='my-bucket', | ||
| Key='my-key' | ||
| ) | ||
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| return { | ||
| 'statusCode': 200, | ||
| 'body': response['Body'].read() | ||
| } | ||
| ---- |
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The code blocks can be made much smaller
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You can preview this rule here (updated a few minutes after each push).
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