Everything about defining functions in serverless.yaml

Simple function that simply has http event.

functions:
  listAnnouncements:
    handler: KeidApis.Apis::KeidApis.Apis.Controllers.AnnouncementsController::List
    package:
      artifact: bin/Release/netcoreapp3.1/package.zip
    events:
      - http:
          path: announcements
          method: get

I used Controller convention as I’m used to ASP.NET core structure.

The handler’s format is [Assembly Name]::[Full Name of the Class]::[Method Name]

Valule	Description
KeidApis.Apis	the name of the assembly
KeidApis.Apis.Controllers.AnnouncementsController	the full class name
List	the method name

HTTP uri with request parameters

You can define request parameters, so that the function can parse a part of the uri and use it as parameter.

  updateWarranty:
    handler: Navien.Installers.Lambdas::Navien.Installers.Lambdas.Functions.RegistrationsController::WarrantyPut
    package:
      artifact: bin/release/netcoreapp2.1/deploy-package.zip

    events:
      - http:
          path: /registrations/{serialNumber}/warranty
          method: put
          reqeust:
            parameters:
              path:
                serialNumber: true
          cors: true
          private: true

• {serialNumber} is the request parameter
• true means it’s a mandatory parameter. The API Gateway will throw an exceptioin if the parameter is not in the url.
• cors matters as put is not a safe method and you need cors to make an api call from your javascript application.
• private means it’s using an API key.

If you define request parameter, you can get the value from request’s PathParameters collection

public async Task<APIGatewayProxyResponse> WarrantyPut(
    APIGatewayProxyRequest request)
{
    var serialNumber = request.PathParameters["serialNumber"];