https://www.duncanleung.com/blog 📚 Learning, 👨🏻‍💻 Building, 📝 Documenting... en-us duncan@leungs.email (Duncan Leung) duncan@leungs.email (Duncan Leung) Wed, 05 Feb 2020 00:00:00 GMT https://www.duncanleung.com/blog/aws-lambda-cold-start-optimization-nodejs https://www.duncanleung.com/blog/aws-lambda-cold-start-optimization-nodejs A practical guide to reducing AWS Lambda cold start latency in Node.js - the anatomy of a cold start, six concrete optimizations from SDK tree-shaking to HTTP keep-alive, common myths (VPC and Layers), and when to reach for Provisioned Concurrency. Wed, 05 Feb 2020 00:00:00 GMT duncan@leungs.email (Duncan Leung) serverlessaws-lambdaperformance https://www.duncanleung.com/blog/aws-sdk-promise-async-await-nodejs-lambda https://www.duncanleung.com/blog/aws-sdk-promise-async-await-nodejs-lambda Bridging callback-style AWS SDK v2 methods with async/await in Node.js Lambda handlers - the .promise() method, sequential and parallel SDK calls, and the init-outside-handler pattern for cached Promises. Sat, 15 Feb 2020 00:00:00 GMT duncan@leungs.email (Duncan Leung) serverlessaws-lambdanodejs https://www.duncanleung.com/blog/cloudformation-ref-vs-getatt-serverless-yml https://www.duncanleung.com/blog/cloudformation-ref-vs-getatt-serverless-yml The mental model behind CloudFormation !Ref and !GetAtt - !Ref returns a resource primary identifier, !GetAtt returns one of its named attributes. With practical examples for IAM permissions and Lambda environment variables in serverless.yml. Sat, 15 Feb 2020 00:00:00 GMT duncan@leungs.email (Duncan Leung) serverlessaws-cloudformation https://www.duncanleung.com/blog/lambda-to-lambda-invocation-when-okay-when-avoid https://www.duncanleung.com/blog/lambda-to-lambda-invocation-when-okay-when-avoid AWS docs call Lambda-to-Lambda invocation an anti-pattern, but there are specific cases where direct invoke is the right call. A walkthrough of the real costs, the cases where they apply, the cases where they do not, and the alternatives. Sat, 15 Feb 2020 00:00:00 GMT duncan@leungs.email (Duncan Leung) serverlessaws-lambda https://www.duncanleung.com/blog/serverless-debugging https://www.duncanleung.com/blog/serverless-debugging DRAFT: Serverless Notes Sat, 15 Feb 2020 00:00:00 GMT duncan@leungs.email (Duncan Leung) serverlessaws-lambdaaws-api-gatewayaws-iam https://www.duncanleung.com/blog/serverless-export-environment-variables https://www.duncanleung.com/blog/serverless-export-environment-variables Bridging CloudFormation-generated runtime values - DynamoDB table names, API Gateway URLs, ARNs that do not exist until deployment - into a local .env file using the serverless-export-env plugin. Sun, 10 May 2020 00:00:00 GMT duncan@leungs.email (Duncan Leung) serverlessaws-lambdaaws-cloudformation https://www.duncanleung.com/blog/serverless-framework-cli-commands-by-workflow https://www.duncanleung.com/blog/serverless-framework-cli-commands-by-workflow A practical cheatsheet for the Serverless Framework CLI - organized by workflow phase (bootstrap, develop, deploy, invoke, inspect, rollback, remove) instead of alphabetically. Sat, 15 Feb 2020 00:00:00 GMT duncan@leungs.email (Duncan Leung) serverlessaws-lambda https://www.duncanleung.com/blog/serverless-framework-least-privilege-iam-deployment-strategy https://www.duncanleung.com/blog/serverless-framework-least-privilege-iam-deployment-strategy Two practical patterns for scoping down the IAM permissions used by the Serverless Framework CLI when deploying - bottom-up gradual scoping, and the top-down 'dedicated deployer' pattern using a dev account as a permission discovery sandbox. Sat, 15 Feb 2020 00:00:00 GMT duncan@leungs.email (Duncan Leung) serverlessaws-iamaws-lambda https://www.duncanleung.com/blog/serverless-testing-strategy-integration-over-unit https://www.duncanleung.com/blog/serverless-testing-strategy-integration-over-unit Most serverless bugs don't live in your code - they live at integration points and in IAM config. Here's why unit tests miss them and what to test instead. Sat, 15 Feb 2020 00:00:00 GMT duncan@leungs.email (Duncan Leung) serverlessaws-lambdaaws-iam https://www.duncanleung.com/blog/notes-web-cache-invalidation https://www.duncanleung.com/blog/notes-web-cache-invalidation DRAFT: Switch the AWS Profile for Serverless CLI Tue, 05 May 2020 00:00:00 GMT duncan@leungs.email (Duncan Leung) serverlessaws-cli https://www.duncanleung.com/blog/switch-multiple-aws-profile-aws-cli-serverless https://www.duncanleung.com/blog/switch-multiple-aws-profile-aws-cli-serverless A guide to set up and switch between multiple AWS profiles when working with AWS CLI and Serverless Framework projects. Tue, 05 May 2020 00:00:00 GMT duncan@leungs.email (Duncan Leung) awsserverless https://www.duncanleung.com/blog/visual-studio-code-yml-custom-serverless-tag https://www.duncanleung.com/blog/visual-studio-code-yml-custom-serverless-tag Learn how to set up VS Code to properly recognize and validate custom YAML tags used in Serverless Framework configuration files. Fri, 08 May 2020 00:00:00 GMT duncan@leungs.email (Duncan Leung) vscodeserverless https://www.duncanleung.com/blog/serverless-pseudo-parameters-reference-another-lambda https://www.duncanleung.com/blog/serverless-pseudo-parameters-reference-another-lambda A detailed guide to using Serverless Framework pseudo parameters for referencing Lambda functions and other AWS resources in your serverless applications. Sun, 10 May 2020 00:00:00 GMT duncan@leungs.email (Duncan Leung) awsserverless https://www.duncanleung.com/blog/serverless-set-breakpoint-locally-debug-aws-lambda https://www.duncanleung.com/blog/serverless-set-breakpoint-locally-debug-aws-lambda A step-by-step guide to setting up and using breakpoints for local debugging of AWS Lambda functions, improving serverless development workflow. Thu, 28 May 2020 00:00:00 GMT duncan@leungs.email (Duncan Leung) awsserverlessdebugging https://www.duncanleung.com/blog/serverless-securing-authenticate-aws-api-gateway-endpoints-cognito-iam-api-key https://www.duncanleung.com/blog/serverless-securing-authenticate-aws-api-gateway-endpoints-cognito-iam-api-key A guide to implement authentication and authorization in AWS API Gateway, covering Cognito User Pools, IAM roles, and API keys with practical examples. Sat, 30 May 2020 00:00:00 GMT duncan@leungs.email (Duncan Leung) awsserverlesssecurity