Unable to execute Lambda in Async mode via API Gateway POST request

问题

Why currently there no way to execute AWS Lambda in asynchronous mode via Gateway API without involving intermediary Lambda just for calling invoke() method?

Even if i add integration like this:

r = client.put_integration(
    restApiId=rest_api_id,
    resourceId=resource_id,
    httpMethod='POST',
    type='AWS',
    integrationHttpMethod='POST',
    uri=uri,
    requestParameters={
        'integration.request.header.X-Amz-Invocation-Type': "'Event'",
        'integration.request.header.Invocation-Type': "'Event'"
    }
)

It still executed synchronously... Are there some platform limitation or so?

回答1:

I have an example Swagger document which you can switch invocation type to Lambda function. I guess you already got how to map the header to trigger the different invocation types, but I think you might forget to deploy the API.

Swagger

{
  "swagger": "2.0",
  "info": {
    "version": "2016-02-11T22:00:31Z",
    "title": "LambdaAsync"
  },
  "host": "<placeholder>",
  "basePath": "<placeholder>",
  "schemes": [
    "https"
  ],
  "paths": {
    "/": {
      "get": {
        "produces": [
          "application/json"
        ],
        "parameters": [
          {
            "name": "X-Amz-Invocation-Type",
            "in": "header",
            "required": false,
            "type": "string"
          }
        ],
        "responses": {
          "200": {
            "description": "200 response",
            "schema": {
              "$ref": "#/definitions/Empty"
            }
          }
        },
        "x-amazon-apigateway-integration": {
          "passthroughBehavior": "when_no_match",
          "httpMethod": "POST",
          "uri": "arn:aws:apigateway:us-east-1:lambda:path/2015-03-31/functions/arn:aws:lambda:us-east-1:<account>:function:<function_name>/invocations?Qualifier=$LATEST",
          "responses": {
            "default": {
              "statusCode": "200"
            }
          },
          "requestParameters": {
            "integration.request.header.X-Amz-Invocation-Type": "method.request.header.X-Amz-Invocation-Type"
          },
          "type": "aws"
        }
      }
    }
  },
  "definitions": {
    "Empty": {
      "type": "object",
      "title": "Empty Schema"
    }
  }
}

来源：https://stackoverflow.com/questions/40564597/unable-to-execute-lambda-in-async-mode-via-api-gateway-post-request

标签

amazon-web-services

aws-lambda

aws-api-gateway