Lambda Function Management

• A function Lambda
  • is a resource
  • invoked to run code
  • it processes events
  • a language specific runtime passes requests and responses between Lambda and function code.
• User need to give function code and provided runtimes
• Develop Lambda functions in
  • the Lambda console – has code editor for noncompiled languages
  • an IDE toolkit
  • AWS CLI – access Lambda API
  • SDKs
• Function code has
  • scripts/compiled program
  • dependencies
• Build Lambda Functions with
  • Node.js
  • Python
  • Ruby
  • Java
  • Go
  • C#
  • PowerShell
• AWS CLI uses AWS SDK for Python to interact with Lambda API

Lambda Programming Model or code writing pattern

• Handler – Lambda calls it start execution of Lambda function. Lambda executes code by calling handler function first.
• Context – context  object is sent to handler function as second parameter
• Logging – logging statements can be added into Lambda function. Limits as per CloudWatch Logs
• Exceptions – Method to notify errors by code.

Code Editor

• Present in Lambda console
• Use it to
  • write Lambda function code
  • test Lambda function code
  • view results of Lambda function code
• Has
  • menu bar – to run common commands.
  • windows – to work with files/folders/other commands.
  • editor pane – to write code.