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Using event filtering on Lambda triggers Jones Zachariah Noel N

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About me https://zachjonesnoel.com 👋 I’m Jones Zachariah Noel N (zachjonesnoel) 🥑 Senior Developer Advocate @ Freshworks ☁ AWS Serverless Hero ⚡ Serverless architect 🚀 AWS UG Bengaluru co-organizer 󰞵 Runs newsletter / blog on The Serverless Terminal

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Agenda ⚡Look into how Lambda triggers work ⚡Dive into Event filtering on Lambda triggers ⚡Demo

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AWS Lambda function triggers Synchronous Asynchronous Poll based

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AWS Lambda function triggers

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Event filtering Targeted invocation Cost effective Filter expression check Poll based mechanism

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Understanding event filtering

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Event filtering supported services DynamoDB Streams Amazon SQS Kinesis Data Streams Amazon MQ Amazon MSK and self managed Apache Kafka

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Event filtering supported services DynamoDB Streams Amazon SQS Kinesis Data Streams Amazon MQ Amazon MSK and self managed Apache Kafka dynamodb body data data value

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Event filter expressions

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Event filter expressions (console)

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Event filter expressions (SAM template) Events: DynamoDBTable: Type: DynamoDB Properties: Stream: !GetAtt DynamoDBTable.StreamArn StartingPosition: TRIM_HORIZON BatchSize: 100 FilterCriteria: Filters: # Filter pattern to check only inserted action on DynamoDB with the item_type being THREAT - Pattern: '{"eventName": ["INSERT"],"dynamodb":{"NewImage":{"item_type":{"S": [ "THREAT" ]}}}}' # Filter pattern to check only deleted action on DynamoDB - Pattern: '{"eventName": ["REMOVE"]}'

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Event filter expressions (AWS CLI)

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● Only the events which match the pattern invoke Lambda fn. ● No additional cost, in-fact cost effective. ● Manual comparison of events patterns. ● Additional times of code. ● Unnecessary invocation of Lambda fn.

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● https://blog.theserverlessterminal.com/trigger-lambda-functions-with-event-filtering ● https://blog.theserverlessterminal.com/deep-dive-into-lambda-event-filters-for-dyanmo db ● https://aws.amazon.com/about-aws/whats-new/2021/11/aws-lambda-event-filtering-am azon-sqs-dynamodb-kinesis-sources/ ● https://github.com/zachjonesnoel/event-filtering-with-dynamo-streams Resources

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Thank you! https://zachjonesnoel.com @zachjonesnoel zachjonesnoel zachjonesnoel jones-zachariah-noel-n https://theserverlessterminal.com https://blog.theserverlessterminal.com