Question 1

How to deploy an AWS Lambda Go function with AWS SAM?

Accepted Answer

Use AWS SAM templates to define your function, specifying the handler and runtime. Package the Go binary as a zip using the build instructions from the README, or use container images for CGO-heavy applications.

Question 2

AWS Lambda Go vs Node.js for cold start performance?

Accepted Answer

Go typically has faster cold starts than Node.js due to compiled binaries, but performance varies with function size. AWS benchmarks often favor Go for latency-sensitive apps, though Node.js might be quicker for lightweight, interpreted code.

Question 3

How to handle errors in AWS Lambda Go functions?

Accepted Answer

Return an error from your handler function; Lambda logs it automatically. For structured API responses, use custom error types and configure mappings in API Gateway to return appropriate HTTP status codes.

Question 4

What event sources are supported in the AWS Lambda Go events package?

Accepted Answer

The package includes types for API Gateway, S3, DynamoDB, SNS, SQS, and more. Check the pkg.go.dev documentation for a full list, which covers most common AWS integrations used in serverless workflows.

Question 5

Best way to test AWS Lambda Go functions locally?

Accepted Answer

Use the AWS SAM CLI to simulate the Lambda environment or tools like localstack. Mock event objects from the events package in unit tests to ensure handler logic works without deploying.

Question 6

How to use environment variables in AWS Lambda Go?

Accepted Answer

Access variables via os.Getenv in your Go code, and set them in Lambda's console or infrastructure as code like CloudFormation. Ensure they are configured during deployment to avoid runtime issues.

aws-lambda-go

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