Problem

Attempting to following the Testing Step Functions and AWS SAM CLI Local instructions, but when I Executed my Local State Machine (Step 6), I got the following error in stdout from the docker terminal tab:

2023-05-03 15:49:39.856: arn:aws:states:us-east-1:123456789012:execution:HelloWorld:test : {"Type":"LambdaFunctionFailed","PreviousEventId":4,"LambdaFunctionFailedEventDetails":{"Error":"Lambda.SdkClientException","Cause":"Unable to execute HTTP request: Connect to localhost:3001 [localhost/127.0.0.1] failed: Connection refused (Connection refused)"}}

Environment

• Running on a MacBook Pro, Apple M1 Pro chip, Ventura 13.3.1
• aws-sam-cli-macos-arm64.pkg
  • SAM CLI, version 1.82.0
• Docker version 23.0.5, build bc4487a
• aws-cli/2.10.3 Python/3.9.11 Darwin/22.4.0 exe/x86_64 prompt/off

Setup

Started SAM

> sam local start-api
> sam local start-lambda

Started Docker:

docker run -p 8083:8083 --env-file ~/docker/aws-stepfunctions-local-credentials.txt amazon/aws-stepfunctions-local

My ~/docker/aws-stepfunctions-local-credentials.txt file:

LAMBDA_ENDPOINT=http://localhost:3001

Details

Full docker stdout

~: docker run -p 8083:8083 --env-file ~/docker/aws-stepfunctions-local-credentials.txt amazon/aws-stepfunctions-local
Step Functions Local
Version: 1.12.0
Build: 2022-11-21
2023-05-03 16:01:45.288: Configure [LAMBDA_ENDPOINT] to [http://localhost:3001]
2023-05-03 16:01:45.297: Failed to load credentials from environment because Unable to load AWS credentials from environment variables (AWS_ACCESS_KEY_ID (or AWS_ACCESS_KEY) and AWS_SECRET_KEY (or AWS_SECRET_ACCESS_KEY))
2023-05-03 16:01:45.316: Failed to load credentials from profile: default because profile file cannot be null
2023-05-03 16:01:45.316: Failed to load credentials from system properties because Unable to load AWS credentials from Java system properties (aws.accessKeyId and aws.secretKey)
2023-05-03 16:01:45.316: Failed to load credentials, default to dummy credentials, so any connection to AWS services will not work, connections to local endpoints are not affected.
2023-05-03 16:01:45.561: Starting server on port 8083 with account 123456789012, region us-east-1
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
2023-05-03 16:01:56.872: CreateStateMachine => {"requestClientOptions":{"readLimit":131073,"skipAppendUriPath":false},"requestMetricCollector":null,"customRequestHeaders":null,"customQueryParameters":null,"cloneSource":null,"sdkRequestTimeout":null,"sdkClientExecutionTimeout":null,"name":"HelloWorld","definition":"{  \"Comment\": \"A Hello World example of the Amazon States Language using an AWS Lambda Local function\",  \"StartAt\": \"HelloWorld\",  \"States\": {    \"HelloWorld\": {      \"Type\": \"Task\",      \"Resource\": \"arn:aws:lambda:us-east-1:123456789012:function:HelloWorldFunction\",      \"End\": true    }  }}}}","roleArn":"arn:aws:iam::012345678901:role/DummyRole","type":null,"loggingConfiguration":null,"tags":null,"tracingConfiguration":null,"requestCredentials":null,"requestCredentialsProvider":null,"generalProgressListener":{"syncCallSafe":true},"readLimit":131073,"cloneRoot":null}
2023-05-03 16:01:56.890: [200] CreateStateMachine <= {"sdkResponseMetadata":null,"sdkHttpMetadata":null,"stateMachineArn":"arn:aws:states:us-east-1:123456789012:stateMachine:HelloWorld","creationDate":1683129716882}
2023-05-03 16:02:04.432: StartExecution => {"requestClientOptions":{"readLimit":131073,"skipAppendUriPath":false},"requestMetricCollector":null,"customRequestHeaders":null,"customQueryParameters":null,"cloneSource":null,"sdkRequestTimeout":null,"sdkClientExecutionTimeout":null,"stateMachineArn":"arn:aws:states:us-east-1:123456789012:stateMachine:HelloWorld","name":"test","input":null,"traceHeader":null,"requestCredentials":null,"requestCredentialsProvider":null,"generalProgressListener":{"syncCallSafe":true},"readLimit":131073,"cloneRoot":null}
2023-05-03 16:02:04.453: [200] StartExecution <= {"sdkResponseMetadata":null,"sdkHttpMetadata":null,"executionArn":"arn:aws:states:us-east-1:123456789012:execution:HelloWorld:test","startDate":1683129724450}
2023-05-03 16:02:04.459: arn:aws:states:us-east-1:123456789012:execution:HelloWorld:test : {"Type":"ExecutionStarted","PreviousEventId":0,"ExecutionStartedEventDetails":{"Input":"{}","RoleArn":"arn:aws:iam::012345678901:role/DummyRole"}}
2023-05-03 16:02:04.460: arn:aws:states:us-east-1:123456789012:execution:HelloWorld:test : {"Type":"TaskStateEntered","PreviousEventId":0,"StateEnteredEventDetails":{"Name":"HelloWorld","Input":"{}"}}
2023-05-03 16:02:04.466: arn:aws:states:us-east-1:123456789012:execution:HelloWorld:test : {"Type":"LambdaFunctionScheduled","PreviousEventId":2,"LambdaFunctionScheduledEventDetails":{"Resource":"arn:aws:lambda:us-east-1:123456789012:function:HelloWorldFunction","Input":"{}"}}
2023-05-03 16:02:04.467: arn:aws:states:us-east-1:123456789012:execution:HelloWorld:test : {"Type":"LambdaFunctionStarted","PreviousEventId":3}
2023-05-03 16:02:04.553: arn:aws:states:us-east-1:123456789012:execution:HelloWorld:test : {"Type":"LambdaFunctionFailed","PreviousEventId":4,"LambdaFunctionFailedEventDetails":{"Error":"Lambda.SdkClientException","Cause":"Unable to execute HTTP request: Connect to localhost:3001 [localhost/127.0.0.1] failed: Connection refused (Connection refused)"}}
2023-05-03 16:02:04.555: arn:aws:states:us-east-1:123456789012:execution:HelloWorld:test : {"Type":"ExecutionFailed","PreviousEventId":5,"ExecutionFailedEventDetails":{"Error":"Lambda.SdkClientException","Cause":"Unable to execute HTTP request: Connect to localhost:3001 [localhost/127.0.0.1] failed: Connection refused (Connection refused)"}}

Full SAM lambda stdout

~/sam-app: sam local start-lambda
Initializing the lambda functions containers.
Local image is up-to-date
Using local image: public.ecr.aws/lambda/python:3.9-rapid-x86_64.

Mounting /Users/blusigna/sam-app/.aws-sam/build/HelloWorldFunction as /var/task:ro,delegated, inside runtime container
Containers Initialization is done.
Starting the Local Lambda Service. You can now invoke your Lambda Functions defined in your template through the endpoint.
2023-05-03 11:51:08 WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
 * Running on http://127.0.0.1:3001
2023-05-03 11:51:08 Press CTRL+C to quit

AWS stdout

~: aws stepfunctions --endpoint http://localhost:8083 create-state-machine --definition "{\
  \"Comment\": \"A Hello World example of the Amazon States Language using an AWS Lambda Local function\",\
  \"StartAt\": \"HelloWorld\",\
  \"States\": {\
    \"HelloWorld\": {\
      \"Type\": \"Task\",\
      \"Resource\": \"arn:aws:lambda:us-east-1:123456789012:function:HelloWorldFunction\",\
      \"End\": true\
    }\
  }\
}\
}}" --name "HelloWorld" --role-arn "arn:aws:iam::012345678901:role/DummyRole"
{
    "stateMachineArn": "arn:aws:states:us-east-1:123456789012:stateMachine:HelloWorld",
    "creationDate": "2023-05-03T12:01:56.882000-04:00"
}
~: 
~: 
~: 
~: aws stepfunctions --endpoint http://localhost:8083 start-execution --state-machine arn:aws:states:us-east-1:123456789012:stateMachine:HelloWorld --name test
{
    "executionArn": "arn:aws:states:us-east-1:123456789012:execution:HelloWorld:test",
    "startDate": "2023-05-03T12:02:04.450000-04:00"
}