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Cargo Lambda Prototype

MIT licensed

  • Deploy a Rust programming language serverless Function-as-a-Service (FaaS)
  • Uses Amazon Web Services (AWS) Lambda, AWS CloudFormation (CFn), and Cargo Lambda

CLI Installation

Cargo Lambda Installation

scoop bucket add cargo-lambda https://github.com/cargo-lambda/scoop-cargo-lambda
scoop install cargo-lambda/cargo-lambda

Usage

  • Start a Lambda server on your localhost
cd cargo-lambda-prototype/
cargo lambda watch

cargo lambda -v invoke \
  --data-example apigw-request cargo-lambda-prototype \
  --output-format json
  • Edit the cached example input file to change the name
    • Look for the name property under multiValueQueryStringParameters
  • Run the cargo lambda invoke command again
    • The output should show the changed name

Build

  • You must build your Lambda before you can deploy it
cargo lambda build --release

Deploy Using Cargo Lambda

  • Activate your AWS access key via the AWS Console
  • Deploy the Lambda to the cloud
    • This will automatically generate a role for you
    • Note the generated URL
cargo lambda deploy --enable-function-url
  • Test
    • Example URL: https://[abc123].lambda-url.[region].on.aws/?name=World

Undeploy Using Cargo Lambda

  • It appears that Cargo Lambda does not currently have an undeploy option
    • So you will need to undeploy using the AWS CLI
  • Get the Lambda function details
    • You will need the name of the role for the Lambda function in a later step
    • This was the role that was automatically created for you when you deployed
aws lambda get-function --function-name cargo-lambda-prototype
  • Delete the Lambda function
aws lambda delete-function --function-name cargo-lambda-prototype
  • List the policies attached to the role
    • Note the ARN for the policy
aws iam list-attached-role-policies --role-name cargo-lambda-role-[UUID]
  • Detach the managed policy from the role
    • You cannot delete the role until you detach the policy
aws iam detach-role-policy \
  --role-name cargo-lambda-role-[UUID] \
  --policy-arn arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole
  • Delete the role
aws iam delete-role --role-name cargo-lambda-role-[UUID]
  • Optional: Delete your CloudWatch log group
  • Deactivate your AWS access key via the AWS Console

Deploy Using a CloudFormation Template for the Role

  • Activate your AWS access key via the AWS Console
  • Validate the CloudFormation (CFn) template file
    • Note that the file is named template-role.yaml instead of template.yaml
aws cloudformation validate-template --template-body file://template-role.yaml
  • Create a CloudFormation (CFn) stack that defines a Lambda execution role
aws cloudformation create-stack \
  --capabilities CAPABILITY_NAMED_IAM \
  --stack-name cargo-lambda-prototype \
  --template-body file://template-role.yaml
  • Get the Amazon Resource Name (ARN) for the created role
    • You might have to wait a bit until the stack has been created
aws iam get-role --role-name cargo-lambda-prototype
  • Deploy the Lambda
    • Use the role ARN
cargo lambda deploy --enable-function-url --iam-role [ROLE-ARN]

Undeploy Using a CloudFormation Template for the Role

  • Delete the Lambda function
aws lambda delete-function --function-name cargo-lambda-prototype
  • Wait a bit for the Lambda function to be deleted
  • Delete the CFn stack with the Lambda execution role
aws cloudformation delete-stack --stack-name cargo-lambda-prototype
  • Optional: Delete your CloudWatch log group
  • Deactivate your AWS access key via the AWS Console

Deploy Using the SAM CLI

  • Activate your AWS access key via the AWS Console
  • Validate the CloudFormation (CFn) template file
    • This is a different template file than the one used in a previous section
aws cloudformation validate-template --template-body file://template.yaml
  • Deploy the Lambda
    • When prompted for the stack name, cargo-lambda-prototype is a valid input
      • Whatever you choose for the stack name gets used in the resource names
    • Note the output URL
sam deploy --guided

Undeploy Using the SAM CLI

  • Delete the CFn stack for the Lambda function
sam delete
  • Optional: Delete the CFn stack for the SAM S3 bucket
    • The stack and S3 bucket might have been created during the guided deploy
    • You cannot delete the stack until you have deleted the S3 bucket
    • It is easiest to delete the S3 bucket from the AWS Console
      • Because you have to empty it before you can delete it
      • Including versioned objects
    • The S3 bucket will have a name like the following with a random suffix
      • aws-sam-cli-managed-default-samclisourcebucket-[random]
aws cloudformation delete-stack --stack-name aws-sam-cli-managed-default
  • Deactivate your AWS access key via the AWS Console

Deploy Using Authentication

  • This example uses OpenID Connect (OIDC) on top of OAuth 2.0
  • Validate the CloudFormation (CFn) template file
    • This is a different template file than the one used in a previous section
aws cloudformation validate-template --template-body file://template-auth.yaml
  • Deploy the Lambda
    • Note the outputs CargoLambdaHttpApiUrl and CargoLambdaSignupUrl
sam deploy -t template-auth.yaml --guided
  • Test by using the output URL
    • In your browser or from the command line
    • You should get "Unauthorized" as the response
    • Example
curl https://a1b2c3.execute-api.us-east-1.amazonaws.com/?name=World
  • Open your browser
  • Open the browser developer console (F12) and start monitoring Network
  • Randomly generate a PKCE code verifier value and compute the code challenge
    • Proof Key for Code Exchange (PKCE)
    • The code challenge is computed by hashing and encoding the code verifier
    • There are online applications which will generate these values for you
    • https://tonyxu-io.github.io/pkce-generator/
  • Enter the CargoLambdaSignupUrl in your browser
    • This was one of the outputs of the CFn template
    • Replace the placeholder code_challenge value parameter value
  • Click on "Sign up" to create a new user account
  • Log in with the new user account
  • Note in the developer console Network monitoring the 302 redirect location
    • There should be a code parameter with a UUID value
  • Exchange the code for tokens
    • Replace the client_id, code, and code_verifier values
curl --location --request POST \
  https://a1b2c3-d4e5f6.auth.us-east-1.amazoncognito.com/oauth2/token \
  --header 'Content-Type: application/x-www-form-urlencoded' \
  --data-urlencode 'client_id=d4e5f6' \
  --data-urlencode 'code=g7h8i9' \
  --data-urlencode 'code_verifier=X1-y2_Z3' \
  --data-urlencode 'grant_type=authorization_code' \
  --data-urlencode 'scope=openid' \
  --data-urlencode 'redirect_uri=http://localhost:8080'
  • Extract the access_token from the response
    • It might be between the id_token and the refresh_token
  • Use the access_token to get the user information
curl -X GET \
  https://a1b2c3-d4e5f6.auth.us-east-1.amazoncognito.com/oauth2/userInfo \
  -H 'Authorization: Bearer <access_token>'
  • Use the access_token to access the Lambda function
    • You will not get "Unauthorized" this time
curl -X GET \
  https://a1b2c3.execute-api.us-east-1.amazonaws.com/ \
  -H 'Authorization: Bearer <access_token>'
  • You can also use the id_token to access the Lambda function
curl -X GET \
  https://a1b2c3.execute-api.us-east-1.amazonaws.com/ \
  -H 'Authorization: Bearer <id_token>'

Undeploy Using Authentication

  • Delete the CFn stack for the Lambda function
sam delete
  • Deactivate your AWS access key via the AWS Console

Links

History

  • Initial release: 2023-12-01

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Cargo Lambda Prototype

www.CroftSoft.com/

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Readme

License

MIT license
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