如何从AWS lambda触发AWS step函数

Question

StartExecutionRequest startExecutionRequest = new StartExecutionRequest();
startExecutionRequest.setStateMachineArn(stateMachineArn);
logger.info("stateMachineArn: "+stateMachineArn);
logger.info("stateMachineInputJson: "+stateMachineInputJson.toString());

AWSStepFunctionsAsync client = AWSStepFunctionsAsyncClientBuilder.defaultClient();
logger.info("startExecutionRequest: "+startExecutionRequest);
try {
    logger.info("startExecutionAsync now");
    client.startExecutionAsync(startExecutionRequest);
    logger.info("startExecutionAsync done");
    return new Response(200,"","stepFunctionTriggered");
} 
catch (Exception e) {
    logger.error("Exception while starting execution:"+ e);
    return  new Response(400,"","Error occured while executing Step Function");
}

START RequestId: 2c6ac51d-1262-4fbf-acdc-ce706d5fbe56 Version: $LATEST
2019-04-02 18:17:56 2c6ac51d-1262-4fbf-acdc-ce706d5fbe56 INFO  LaunchStepFunction:39 - stateMachineArn: arn:aws:states:xxxxx
2019-04-02 18:17:56 2c6ac51d-1262-4fbf-acdc-ce706d5fbe56 INFO  LaunchStepFunction:40 - stateMachineInputJson: {}
2019-04-02 18:18:01 2c6ac51d-1262-4fbf-acdc-ce706d5fbe56 INFO  LaunchStepFunction:43 - startExecutionRequest: {StateMachineArn: arn:aws:states:us-east-1:xxx:stateMachine:xxxx,}
2019-04-02 18:18:01 2c6ac51d-1262-4fbf-acdc-ce706d5fbe56 INFO  LaunchStepFunction:45 - startExecutionAsync now
2019-04-02 18:18:01 2c6ac51d-1262-4fbf-acdc-ce706d5fbe56 INFO  LaunchStepFunction:47 - startExecutionAsync done
END RequestId: 2c6ac51d-1262-4fbf-acdc-ce706d5fbe56

Answer 1

我想通了。

需要使用clientConfig和正确的区域构建AWSStepFunctionsAsyncClient。对我们来说是US-EAST-1。奇怪的是，当我们不做的时候，没有例外，也没有任何事情发生。也就是说，而不是

AWSStepFunctionsAsync client = AWSStepFunctionsAsyncClientBuilder.defaultClient();

我们应该使用：

AWSStepFunctionsAsyncClientBuilder.standard()
            .withClientConfiguration(new ClientConfiguration())
            .withRegion(Regions.US_EAST_1)
            .build();