Local Lambda Debugging
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The document provides an overview of AWS Lambda, covering its creation and functionality, debugging techniques, and the development of a local test harness. It explains deployment options, integration with Backand for serverless app management, and various features offered by Backand. Key takeaways include the importance of event-based triggers, debugging capabilities through CloudWatch, and methods for efficient code deployment.
Local Lambda Debugging
- 1. Local Lambda Development and Debugging Matt Billock [email protected]
- 2. Agenda: ● AWS Lambda Overview ● Debugging AWS Lambda ● Building a local test harness ● Deployment with Backand CLI ● Quick overview of Backand
- 3. AWS Lambda ● Created in 2014, launched at re:Invent ● Kicked off "serverless" (caveat) ● Function-as-a-Service ○Deploy code, not applications
- 4. Creating A Lambda Function ● Supports Node.JS, Python, C#, and Java ○ Can call to server functionality (Linux) ● Code deployment options ○ Uploading as a ZIP file ○ Uploading from S3 ○ Editing in in-browser editor
- 5. Creating A Lambda Function Demo
- 6. Calling AWS Lambda Functions ● Event-based triggers ○ Also On-Demand ● Event Sources ○ AWS Services (S3, DynamoDB, others) ○ API Gateway ○ AWS SDK
- 7. Debugging Lambda Functions ● Cloudwatch Integration ○ Provides call record ● console.log() ○ Sends message to Cloudwatch ● … and that's it
- 8. Lambda Execution Environment ● Details kept proprietary by Amazon ● Based on Amazon Machine Instance ● Dynamically provisioned (hot vs cold) ● Temporary storage (/tmp, 500 MB) ○ NOT guaranteed to persist
- 9. Debugging Lambda Locally ● Need to mimic input format ● Need to mimic output format ○ Transformations in API Gateway ● Need a test harness
- 10. Creating a Test Harness ● Function Prototype ● Including Handler ● Mimicking Lambda Invocation ○ Parameters in event object ○ Handlers in the context object
- 11. Creating a Test Harness ● Calling a Lambda function, continued: ● Provide handlers in context argument
- 12. Test Harness Notes ● Callback mechanism provided by Lambda ○ Only supported by Node.JS actions ● Using callbacks in context parameter ○ Not officially supported ● Not a perfect substitute ○ Calls the function, but not from the same environment
- 13. Improving Iteration Speed ● Per-line output ● Immediate feedback ● Breakpoints and other local debugging tools ● Unit and Integration tests
- 14. Deploying Your Code ● Zip-file from S3, or manual upload ○ NOTE: zip only the source code, not the parent folder! ● Testing upload ● Publishing ● Complex, non-intuitive
- 15. Using Backand's CLI Tool ● Backand On-Demand Node.JS Lambda actions ● Backand CLI abstracts away deployment ● npm install -g backand ● Requires registering with Backand
- 16. Deploying Lambda Code ● Initializing an action- backand action init ○ Arguments available in docs.backand.com ● Copy your Node.JS code into created directory ● Deploy - backand action deploy ○ Arguments available in docs.backand.com
- 17. Calling Your Lambda ● Authentication ○ can be anonymous ○ api.backand.com/1/token ○ See docs ● cURL curl -H "<auth header>" "https://api.backand.com/1/objects/action/<object>?name=<name>" ● JavaScript (with Backand SDK) backand.object.action.get(...)
- 18. What is Backand? ● Serverless app platform ● Manages your app's database ● Manages your app's security and authentication ● Provides custom server-side code execution ● Provides hosting options ● Provides logging, analytics, and more
- 19. Backand Features ● Automated REST API ● Bring your own Database ● Custom JavaScript Actions ● Server-Side Code Execution ● Batch and Bulk Processing ● Scheduled Tasks ● Automated messages ● Real-time Communications ● User and Role-based Security ● Social Media Authentication ● GUI Schema Editor ● Custom Queries ● REST API Playground ● Sample Code Generation ● Hosting ● Detailed Analytics ● Logging ● Multi-Platform SDK ● Single Sign On Support