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AWS Golang Lambda With API Gateway

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This example creates a lambda that does a simple ToUpper on the path input of an API request and returns it.

Deploying the App

To deploy your infrastructure, follow the below steps.

Prerequisites

1. Install Pulumi
2. Configure AWS Credentials
3. Clone aws-go-lambda

Steps

After cloning this repo, run these commands from the working directory:

1. Build the handler:

   • For developers on Linux and macOS:

     make build

   • For developers on Windows:

     • Get the build-lambda-zip tool:

       set GO111MODULE=on
       go.exe get -u github.com/aws/aws-lambda-go/cmd/build-lambda-zip

     • Use the tool from your GOPATH:

       set GOOS=linux
       set GOARCH=amd64
       set CGO_ENABLED=0
       go build -o handler\handler handler\handler.go
       %USERPROFILE%\Go\bin\build-lambda-zip.exe -o handler\handler.zip handler\handler

2. Create a new Pulumi stack, which is an isolated deployment target for this example:

   pulumi stack init

3. Set the required configuration variables for this program:

   $ pulumi config set aws:region us-west-2

4. Execute the Pulumi program to create our lambda:

   ```bash $ pulumi up
   Previewing update (dev): Type Name Plan

   • pulumi:pulumi:Stack go-lambda-dev create
     
   • ├─ aws:apigateway:RestApi UpperCaseGateway create
     
   • ├─ aws:iam:Role task-exec-role create
     
   • ├─ aws:apigateway:Resource UpperAPI create
     
   • ├─ aws:iam:RolePolicy lambda-log-policy create
     
   • ├─ aws:apigateway:Method AnyMethod create
     
   • ├─ aws:lambda:Function basicLambda create
     
   • ├─ aws:lambda:Permission APIPermission create
     
   • ├─ aws:apigateway:Integration LambdaIntegration create
     
   • └─ aws:apigateway:Deployment APIDeployment create
     
     

   Resources: + 10 to create

   Do you want to perform this update? yes Updating (dev): Type Name Status
   + pulumi:pulumi:Stack go-lambda-dev created
   + ├─ aws:apigateway:RestApi UpperCaseGateway created
   + ├─ aws:iam:Role task-exec-role created
   + ├─ aws:apigateway:Resource UpperAPI created
   + ├─ aws:iam:RolePolicy lambda-log-policy created
   + ├─ aws:apigateway:Method AnyMethod created
   + ├─ aws:lambda:Function basicLambda created
   + ├─ aws:apigateway:Integration LambdaIntegration created
   + ├─ aws:lambda:Permission APIPermission created
   + └─ aws:apigateway:Deployment APIDeployment created

   Outputs: invocation URL: “https://.execute-api.us-west-2.amazonaws.com/prod/{message}” lambda : “arn:aws:lambda:us-west-2:ACCOUNTID:function:basicLambda-75711af”

   Resources: + 10 created

   Duration: 29s ```

5. Call our lambda function from the cli:

   curl https://<gateway-id>.execute-api.us-west-2.amazonaws.com/prod/helloworld   
   HELLOWORLD% 

6. From there, feel free to experiment. Simply making edits, rebuilding your handler, and running pulumi up will update your lambda.

7. Afterwards, destroy your stack and remove it:

   pulumi destroy --yes
   pulumi stack rm --yes