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Lambda Advanced

Links: 102 AWS DVA Index

Event and Context Objects

  • Event object contains details about the event.
    • Any type of input arguments, invoking service arguments will be present in the event object.
  • Context object contains information about metadata of the function like the request id, log group name, memory limit, etc.
    • Provides methods and properties that provide information about the invocation, function, and runtime environment.
  • Example:
    • attachments/Pasted image 20230301105407.jpg

File system mounting

  • Lambda functions can access EFS file systems if they are running in a VPC.
  • Configure Lambda to mount EFS file systems to local directory during initialisation.
  • Must leverage EFS Access Points.
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Function URL

  • Dedicated HTTPs endpoint for your Lambda function
    • A unique URL endpoint is generated for you (never changes)
    • https://<url-id>.lambda-url.<region>.on.aws
  • Supports Resource-based Policies & CORS configurations.
  • There are 2 different types of resource based policies
    • NONE: allow public and unauthenticated access. The resource based policy must grant public access.
      • attachments/Pasted image 20230301180324.jpg
    • AWS_IAM: IAM is used to authenticate and authorise requests.
      • For the same account either Identity based policy OR resource based policy is required.
      • For cross account access both identity based policy AND resource based policy is required.
      • attachments/Pasted image 20230301180406.jpg

Last updated: 2023-03-01