How can i call AWS Step Functions by API Gateway? [closed]

问题

I would like to know how to make API Gateway call a Step Function and execute it.

回答1:

API Gateway added support for Step Functions currently. Now you can create an AWS Service integration via API Gateway Console.

Integration Type: AWS Service
AWS Service: Step Functions
HTTP method: POST
Action Type: Use action name
Action: StartExecution
Execution role: role to start the execution
Headers:

X-Amz-Target -> 'AWSStepFunctions.StartExecution'
Content-Type -> 'application/x-amz-json-1.0'
Body Mapping Templates/Request payload:

{ "input": "string", "name": "string", "stateMachineArn": "string" }

回答2:

You can create an API Gateway Endpoint with Integration type: AWS Service and set it up to invoke the required Step Function.

In case you want to use API Gateway so that you can control the exposure of your Step Functions endpoint, you can create a new IAM user (programmatic access only) with a policy that only grants access to this endpoint, eg:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "execute-api:Invoke"           
      ],
      "Resource": [
        "arn:aws:execute-api:us-east-1:my-aws-account-id:my-api-id/my-stage/GET/my-resource-path"
      ]
    }
  ]
}

回答3:

I think you can use API Gateway Proxy Integration to AWS service. Look: https://docs.aws.amazon.com/apigateway/latest/developerguide/how-to-method-settings-console.html

回答4:

Consider creating an AWS Lambda function that backs the APIGw endpoint and having it call AWS StepFunctions via code. We use this approach because our use case allows the API endpoint parameters to direct which of several StepFunctions we need to execute.

Admittedly, it is "more code"; we're hoping AWS elaborates StepFunctions such that they can be triggered by the whole host of AWS resource events.

来源：https://stackoverflow.com/questions/41188584/how-can-i-call-aws-step-functions-by-api-gateway

标签

amazon-web-services

aws-api-gateway

aws-step-functions