Duncan Leung 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 Reducing AWS Lambda Cold Start Latency in Node.js 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 AWS SDK v2 with async/await in Node.js Lambda Handlers 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/lambda-to-lambda-invocation-when-okay-when-avoid When Direct Lambda-to-Lambda Invocation Is OK 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 Serverless Notes 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 Export Serverless Framework Environment Variables to a Local .env File 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 Serverless Framework 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 A Least-Privilege IAM Strategy for Serverless Framework Deployments 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 Serverless Testing Strategy: Test Integrations and IAM Surface 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