Local Lambda Debugging

Local Lambda Debugging

• 1.
  Local Lambda Developmentand Debugging Matt Billock matt@backand.com
• 2.
  Agenda: ● AWS LambdaOverview ● Debugging AWS Lambda ● Building a local test harness ● Deployment with Backand CLI ● Quick overview of Backand
• 3.
  AWS Lambda ● Createdin 2014, launched at re:Invent ● Kicked off "serverless" (caveat) ● Function-as-a-Service ○Deploy code, not applications
• 4.
  Creating A LambdaFunction ● 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 LambdaFunction Demo
• 6.
  Calling AWS LambdaFunctions ● 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 TestHarness ● Function Prototype ● Including Handler ● Mimicking Lambda Invocation ○ Parameters in event object ○ Handlers in the context object
• 11.
  Creating a TestHarness ● 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 CLITool ● 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 ● AutomatedREST 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
• 20.
  THANK YOU https://github.com/backand https://www.backand.com matt@backand.com