System.ArgumentException running with .NET 7 NativeAOT

[fiannafritz]

I'm trying to run the attached sample project with the .NET 7 test tool. I input "{"Id": "test"} in the Tool. I expected it to detect it as a "Test" object and return "test" as an uppercase string. However, I'm getting an ArgumentException because it says it can't convert a memory stream to an APIGatewayHttpApiV2ProxyRequest. I don't understand how to test my function?
MyFirstLambdaVS2022.zip

[ashishdhingra]

@fiannafritz Good afternoon. The issue doesn't appear to be reproducible in the actual AWS environment while deploying the code to us-east-2 region:

• Modified aws-lambda-tools-defaults.json to use region us-east-2.
• Updated the NuGet packages to latest version.
• From Terminal, used dotnet lambda deploy-function to deploy the function to AWS.
• In Lambda console, tested the function using the following example request JSON:

{
  "version": "2.0",
  "routeKey": "$default",
  "rawPath": "/my/path",
  "rawQueryString": "parameter1=value1&parameter1=value2&parameter2=value",
  "cookies": [
    "cookie1",
    "cookie2"
  ],
  "headers": {
    "header1": "value1",
    "header2": "value1,value2"
  },
  "queryStringParameters": {
    "parameter1": "value1,value2",
    "parameter2": "value"
  },
  "requestContext": {
    "accountId": "123456789012",
    "apiId": "api-id",
    "authentication": {
      "clientCert": {
        "clientCertPem": "CERT_CONTENT",
        "subjectDN": "www.example.com",
        "issuerDN": "Example issuer",
        "serialNumber": "a1:a1:a1:a1:a1:a1:a1:a1:a1:a1:a1:a1:a1:a1:a1:a1",
        "validity": {
          "notBefore": "May 28 12:30:02 2019 GMT",
          "notAfter": "Aug  5 09:36:04 2021 GMT"
        }
      }
    },
    "authorizer": {
      "jwt": {
        "claims": {
          "claim1": "value1",
          "claim2": "value2"
        },
        "scopes": [
          "scope1",
          "scope2"
        ]
      }
    },
    "domainName": "id.execute-api.us-east-1.amazonaws.com",
    "domainPrefix": "id",
    "http": {
      "method": "POST",
      "path": "/my/path",
      "protocol": "HTTP/1.1",
      "sourceIp": "192.0.2.1",
      "userAgent": "agent"
    },
    "requestId": "id",
    "routeKey": "$default",
    "stage": "$default",
    "time": "12/Mar/2020:19:03:58 +0000",
    "timeEpoch": 1583348638390
  },
  "body": "{\"Id\": \"Hello from Lambda\"}",
  "pathParameters": {
    "parameter1": "value1"
  },
  "isBase64Encoded": false,
  "stageVariables": {
    "stageVariable1": "value1",
    "stageVariable2": "value2"
  }
}

Kindly note that the body parameter in above JSON is adjusted per your code where it's parsing the Id.

However, in Lambda Test Tool, it's giving the error System.ArgumentException: Object of type 'System.IO.MemoryStream' cannot be converted to type 'Amazon.Lambda.APIGatewayEvents.APIGatewayHttpApiV2ProxyRequest' as reported by you. Unsure if this is issue with the Lambda Test Tool and whether it supports Native AOT based projects.

CCing @normj.

EDIT 1: I found similar error reported in StackOverflow post https://stackoverflow.com/questions/75276346/testing-nativeaot-with-mock-lambda-test-tool-results-in-error and it suggested to use Executable Assembly page (default URL http://localhost:5050/runtime) to test AOT based Lambda functions. @fiannafritz Could you please confirm if it works for you?

EDIT 2: I was able to run it successfully using the below steps:

• Open Terminal / Command Prompt
• Navigate to project directory containing the .csproj file.
• Execute dotnet lambda-test-tool-7.0. This will run and launch the Lambda Test Tool UI in web browser.
• Navigate to Executable Assembly page in the test tool UI.
• As mentioned in Executable Assembly documentation (http://localhost:5050/documentation), modify your launchSettings.json to below:

{
  "profiles": {
    "MyFirstLambdaVS2022": {
      "commandName": "Project",
      "environmentVariables": {
        "AWS_LAMBDA_RUNTIME_API": "localhost:5050"
      }
    }
  }
}

Take note that the commandName is Project (not the Executable) and we have specified environment variable AWS_LAMBDA_RUNTIME_API with value localhost:5050.

• Start debugging the project via Visual Studio.
• In Lambda Test Tool Executable Assembly page, Queue the above event JSON. It should now work.

[github-actions[bot]]

Hello! Reopening this discussion to make it searchable.