bug: Step Functions aws-sdk:sfn:sendTaskSuccess returning unknown service 'sfn'

[athillairajah]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

I am executing a state machine that calls a child state machine and uses the built in Send Task Success to call back the parent state machine upon the success of the child state machine.

The parent step function has a step to start the child step function execution and wait for the task token that is defined:

"Step Functions StartExecution - sync import": {
            "Type": "Task",
            "Resource": "arn:aws:states:::states:startExecution.waitForTaskToken",
            "Parameters": {
              "StateMachineArn": "{{serviceSfnSync}}",
              "Input": {
                "TaskToken.$": "$$.Task.Token",
                "service.$": "$",
              }
            },
            "End": true
          }

and the child step function has a step to send the task token back to the parent upon success:

"Send Task Success to root Step Function": {
      "Type": "Task",
      "End": true,
      "Parameters": {
        "Output": "{\"output\": \"success\"}",
        "TaskToken.$": "$$.Execution.Input.TaskToken"
      },
      "Resource": "arn:aws:states:::aws-sdk:sfn:sendTaskSuccess"
    }

When these step functions are run, I get the following error

Stepfunctions computation ended with exception 'UnknownServiceError(Unknown service: 'sfn'. Valid service names are: accessanalyzer, account, acm, acm-pca, alexaforbusiness, amp, amplify, amplifybackend, amplifyuibuilder, apigateway, apigatewaymanagementapi, apigatewayv2, appconfig, appconfigdata, appfabric, appflow, appintegrations, application-autoscaling, application-insights, applicationcostprofiler, appmesh, apprunner, appstream, appsync, arc-zonal-shift, artifact, athena, auditmanager, autoscaling, autoscaling-plans, b2bi, backup, backup-gateway, backupstorage, batch, bcm-data-exports, bedrock, bedrock-agent, bedrock-agent-runtime, bedrock-runtime, billingconductor, braket, budgets, ce, chatbot, chime, chime-sdk-identity, chime-sdk-media-pipelines, chime-sdk-meetings, chime-sdk-messaging, chime-sdk-voice, cleanrooms, cleanroomsml, cloud9, cloudcontrol, clouddirectory, cloudformation, cloudfront, cloudfront-keyvaluestore, cloudhsm, cloudhsmv2, cloudsearch, cloudsearchdomain, cloudtrail, cloudtrail-data, cloudwatch, codeartifact, codebuild, codecatalyst, codecommit, codedeploy, codeguru-reviewer, codeguru-security, codeguruprofiler, codepipeline, codestar, codestar-connections, codestar-notifications, cognito-identity, cognito-idp, cognito-sync, comprehend, comprehendmedical, compute-optimizer, config, connect, connect-contact-lens, connectcampaigns, connectcases, connectparticipant, controltower, cost-optimization-hub, cur, customer-profiles, databrew, dataexchange, datapipeline, datasync, datazone, dax, detective, devicefarm, devops-guru, directconnect, discovery, dlm, dms, docdb, docdb-elastic, drs, ds, dynamodb, dynamodbstreams, ebs, ec2, ec2-instance-connect, ecr, ecr-public, ecs, efs, eks, eks-auth, elastic-inference, elasticache, elasticbeanstalk, elastictranscoder, elb, elbv2, emr, emr-containers, emr-serverless, entityresolution, es, events, evidently, finspace, finspace-data, firehose, fis, fms, forecast, forecastquery, frauddetector, freetier, fsx, gamelift, glacier, globalaccelerator, glue, grafana, greengrass, greengrassv2, groundstation, guardduty, health, healthlake, honeycode, iam, identitystore, imagebuilder, importexport, inspector, inspector-scan, inspector2, internetmonitor, iot, iot-data, iot-jobs-data, iot-roborunner, iot1click-devices, iot1click-projects, iotanalytics, iotdeviceadvisor, iotevents, iotevents-data, iotfleethub, iotfleetwise, iotsecuretunneling, iotsitewise, iotthingsgraph, iottwinmaker, iotwireless, ivs, ivs-realtime, ivschat, kafka, kafkaconnect, kendra, kendra-ranking, keyspaces, kinesis, kinesis-video-archived-media, kinesis-video-media, kinesis-video-signaling, kinesis-video-webrtc-storage, kinesisanalytics, kinesisanalyticsv2, kinesisvideo, kms, lakeformation, lambda, launch-wizard, lex-models, lex-runtime, lexv2-models, lexv2-runtime, license-manager, license-manager-linux-subscriptions, license-manager-user-subscriptions, lightsail, location, logs, lookoutequipment, lookoutmetrics, lookoutvision, m2, machinelearning, macie2, managedblockchain, managedblockchain-query, marketplace-agreement, marketplace-catalog, marketplace-deployment, marketplace-entitlement, marketplacecommerceanalytics, mediaconnect, mediaconvert, medialive, mediapackage, mediapackage-vod, mediapackagev2, mediastore, mediastore-data, mediatailor, medical-imaging, memorydb, meteringmarketplace, mgh, mgn, migration-hub-refactor-spaces, migrationhub-config, migrationhuborchestrator, migrationhubstrategy, mobile, mq, mturk, mwaa, neptune, neptune-graph, neptunedata, network-firewall, networkmanager, networkmonitor, nimble, oam, omics, opensearch, opensearchserverless, opsworks, opsworkscm, organizations, osis, outposts, panorama, payment-cryptography, payment-cryptography-data, pca-connector-ad, personalize, personalize-events, personalize-runtime, pi, pinpoint, pinpoint-email, pinpoint-sms-voice, pinpoint-sms-voice-v2, pipes, polly, pricing, privatenetworks, proton, qbusiness, qconnect, qldb, qldb-session, quicksight, ram, rbin, rds, rds-data, redshift, redshift-data, redshift-serverless, rekognition, repostspace, resiliencehub, resource-explorer-2, resource-groups, resourcegroupstaggingapi, robomaker, rolesanywhere, route53, route53-recovery-cluster, route53-recovery-control-config, route53-recovery-readiness, route53domains, route53resolver, rum, s3, s3control, s3outposts, sagemaker, sagemaker-a2i-runtime, sagemaker-edge, sagemaker-featurestore-runtime, sagemaker-geospatial, sagemaker-metrics, sagemaker-runtime, savingsplans, scheduler, schemas, sdb, secretsmanager, securityhub, securitylake, serverlessrepo, service-quotas, servicecatalog, servicecatalog-appregistry, servicediscovery, ses, sesv2, shield, signer, simspaceweaver, sms, sms-voice, snow-device-management, snowball, sns, sqs, sqs-json, ssm, ssm-contacts, ssm-incidents, ssm-sap, sso, sso-admin, sso-oidc, stepfunctions, storagegateway, sts, supplychain, support, support-app, swf, synthetics, textract, timestream-query, timestream-write, tnb, transcribe, transfer, translate, trustedadvisor, verifiedpermissions, voice-id, vpc-lattice, waf, waf-regional, wafv2, wellarchitected, wisdom, workdocs, worklink, workmail, workmailmessageflow, workspaces, workspaces-thin-client, workspaces-web, xray)'.

A similar issue was reported here #9872 but I don't believe "When using aws-sdk:sfn:startExecution the returned error is incorrect. sfn is a valid service name when using aws-sdk on LocalStack Step Functions." was ever addressed in the solution. I am guessing there is some sort of internal transformation missing that would transform "sfn" to "stepfunctions" which is required by some internal library (boto3?)

Expected Behavior

The resource definition "arn:aws:states:::aws-sdk:sfn:sendTaskSuccess" is valid and should work within LocalStack without causing an unknown service error.
On the previous similar issue is says: sfn should appear in the list of valid service names for aws-sdk on Step Functions. I believe there may be some sort of internal transformation missing to get direct aws sfn internal sdk calls to work.

How are you starting LocalStack?

With a docker-compose file

Steps To Reproduce

1. Define 2 simple state machines (one parent and one child), the parent state machine should have a waitForTaskToken task step that starts an execution of the child state machine. The child state machine should have sendTaskSuccess task step to call back the parent step function.
2. Execute the parent state machine and see the UnknownServiceError come up for 'sfn' from the send task success step

Environment

- OS: macOS 14.4.1
- LocalStack: 3.2.0

Anything else?

No response

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[MEPalma]

@athillairajah Thank you for taking the time to compile this thorough report. I was able to replicate the behaviour in instances where the sendTaskSuccess call resulted in a failure. We recently merged some changes that aim to address this issue. These changes are scheduled to be included in the next nightly release too. I would be grateful if you could test the new build at your earliest convenience and provide feedback on whether it resolves the problem you encountered. Thank you once again for bringing this issue forward.

[localstack-bot]

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