winterbaume-sfn

Step Functions service implementation for winterbaume.

Coverage

Metric	Value
Service	Step Functions
AWS model	sfn
Protocol	awsJson1.0
winterbaume coverage	35/37 operations (94.6%)
stubs (routed, returns empty/default)	2/37 operations (5.4%)
moto coverage	29/37 operations (78.4%)
floci coverage	0/37 operations (0.0%)
kumo coverage	18/37 operations (48.6%)
Coverage report date	2026-05-13

Server-mode usage

Start winterbaume-server and point the AWS CLI at it:

cargo run -p winterbaume-server -- --host 127.0.0.1 --port 5555

export AWS_ENDPOINT_URL=http://localhost:5555
aws stepfunctions list-state-machines

Example

use aws_sdk_sfn::config::BehaviorVersion;
use winterbaume_core::MockAws;
use winterbaume_sfn::SfnService;

#[tokio::main]
async fn main() {
    let mock = MockAws::builder().with_service(SfnService::new()).build();

    let config = aws_config::defaults(BehaviorVersion::latest())
        .http_client(mock.http_client())
        .credentials_provider(mock.credentials_provider())
        .region(aws_sdk_sfn::config::Region::new("us-east-1"))
        .load()
        .await;

    let client = aws_sdk_sfn::Client::new(&config);

    let resp = client
        .list_state_machines()
        .send()
        .await
        .expect("list_state_machines should succeed");
    println!(
        "Step Functions state machines: {}",
        resp.state_machines().len()
    );
}

Implemented APIs (35)

• CreateActivity
• CreateStateMachine
• CreateStateMachineAlias
• DeleteActivity
• DeleteStateMachine
• DeleteStateMachineAlias
• DeleteStateMachineVersion
• DescribeActivity
• DescribeExecution
• DescribeMapRun
• DescribeStateMachine
• DescribeStateMachineAlias
• DescribeStateMachineForExecution
• GetActivityTask
• GetExecutionHistory
• ListActivities
• ListExecutions
• ListMapRuns
• ListStateMachineAliases
• ListStateMachineVersions
• ListStateMachines
• ListTagsForResource
• PublishStateMachineVersion
• RedriveExecution
• SendTaskFailure
• SendTaskHeartbeat
• SendTaskSuccess
• StartExecution
• StopExecution
• TagResource
• UntagResource
• UpdateMapRun
• UpdateStateMachine
• UpdateStateMachineAlias
• ValidateStateMachineDefinition

Stubbed APIs (2) — routed but return an empty/default response

• StartSyncExecution
• TestState