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AWS Step Functions
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AWS Step Functions

AWS Step Functions

AWS Step Functions is a service that lets you coordinate the components of distributed applications and microservices using visual workflows.

You can use Step Functions to build applications from individual components, each of which performs a discrete function, or task, allowing you to scale and change applications quickly. Step Functions provides a console that helps visualize the components of your application as a series of steps. Step Functions automatically triggers and tracks each step, and retries steps when there are errors, so your application executes predictably and in the right order every time. Step Functions logs the state of each step, so you can quickly diagnose and debug any issues.

Step Functions manages operations and underlying infrastructure to ensure your application is available at any scale. You can run tasks on AWS, your own servers, or any system that has access to AWS. You can access and use Step Functions using the console, the AWS SDKs, or an HTTP API. For more information about Step Functions, see the AWS Step Functions Developer Guide .

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  • Managed: -
  • Lizenz: Apache License 2.0
  • Programmiert mit: javascript
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Technical Specifications

startFlow

OnInit
./lib/triggers/startFlow.js
OnStartup
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OnClose
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Attributes

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CreateActivity

Creates an activity. An activity is a task that you write in any programming language and host on any machine that has access to AWS Step Functions. Activities must poll Step Functions using the GetActivityTask API action and respond using SendTask* API actions. This function lets Step Functions know the existence of your activity and returns an identifier for use in a state machine and when polling from the activity.

This operation is eventually consistent. The results are best effort and may not reflect very recent updates and changes.

OnInit
./lib/actions/CreateActivity.js
OnStartup
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OnClose
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Attributes

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CreateStateMachine

Creates a state machine. A state machine consists of a collection of states that can do work (Task states), determine to which states to transition next (Choice states), stop an execution with an error (Fail states), and so on. State machines are specified using a JSON-based, structured language.

This operation is eventually consistent. The results are best effort and may not reflect very recent updates and changes.

OnInit
./lib/actions/CreateStateMachine.js
OnStartup
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OnClose
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Attributes

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DeleteActivity

Deletes an activity.

OnInit
./lib/actions/DeleteActivity.js
OnStartup
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OnClose
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Attributes

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DeleteStateMachine

Deletes a state machine. This is an asynchronous operation: It sets the state machine's status to DELETING and begins the deletion process. Each state machine execution is deleted the next time it makes a state transition.

The state machine itself is deleted after all executions are completed or deleted.

OnInit
./lib/actions/DeleteStateMachine.js
OnStartup
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OnClose
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Attributes

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DescribeActivity

Describes an activity.

This operation is eventually consistent. The results are best effort and may not reflect very recent updates and changes.

OnInit
./lib/actions/DescribeActivity.js
OnStartup
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OnClose
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Attributes

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DescribeExecution

Describes an execution.

This operation is eventually consistent. The results are best effort and may not reflect very recent updates and changes.

OnInit
./lib/actions/DescribeExecution.js
OnStartup
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OnClose
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Attributes

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DescribeStateMachine

Describes a state machine.

This operation is eventually consistent. The results are best effort and may not reflect very recent updates and changes.

OnInit
./lib/actions/DescribeStateMachine.js
OnStartup
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OnClose
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Attributes

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DescribeStateMachineForExecution

Describes the state machine associated with a specific execution.

This operation is eventually consistent. The results are best effort and may not reflect very recent updates and changes.

OnInit
./lib/actions/DescribeStateMachineForExecution.js
OnStartup
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OnClose
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Attributes

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GetActivityTask

Used by workers to retrieve a task (with the specified activity ARN) which has been scheduled for execution by a running state machine. This initiates a long poll, where the service holds the HTTP connection open and responds as soon as a task becomes available (i.e. an execution of a task of this type is needed.) The maximum time the service holds on to the request before responding is 60 seconds. If no task is available within 60 seconds, the poll returns a taskToken with a null string.

Workers should set their client side socket timeout to at least 65 seconds (5 seconds higher than the maximum time the service may hold the poll request).

Polling with GetActivityTask can cause latency in some implementations. See Avoid Latency When Polling for Activity Tasks in the Step Functions Developer Guide.

OnInit
./lib/actions/GetActivityTask.js
OnStartup
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OnClose
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Attributes

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GetExecutionHistory

Returns the history of the specified execution as a list of events. By default, the results are returned in ascending order of the timeStamp of the events. Use the reverseOrder parameter to get the latest events first.

If nextToken is returned, there are more results available. The value of nextToken is a unique pagination token for each page. Make the call again using the returned token to retrieve the next page. Keep all other arguments unchanged. Each pagination token expires after 24 hours. Using an expired pagination token will return an HTTP 400 InvalidToken error.

OnInit
./lib/actions/GetExecutionHistory.js
OnStartup
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OnClose
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Attributes

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ListActivities

Lists the existing activities.

If nextToken is returned, there are more results available. The value of nextToken is a unique pagination token for each page. Make the call again using the returned token to retrieve the next page. Keep all other arguments unchanged. Each pagination token expires after 24 hours. Using an expired pagination token will return an HTTP 400 InvalidToken error.

This operation is eventually consistent. The results are best effort and may not reflect very recent updates and changes.

OnInit
./lib/actions/ListActivities.js
OnStartup
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OnClose
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Attributes

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ListExecutions

Lists the executions of a state machine that meet the filtering criteria. Results are sorted by time, with the most recent execution first.

If nextToken is returned, there are more results available. The value of nextToken is a unique pagination token for each page. Make the call again using the returned token to retrieve the next page. Keep all other arguments unchanged. Each pagination token expires after 24 hours. Using an expired pagination token will return an HTTP 400 InvalidToken error.

This operation is eventually consistent. The results are best effort and may not reflect very recent updates and changes.

OnInit
./lib/actions/ListExecutions.js
OnStartup
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OnClose
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Attributes

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ListStateMachines

Lists the existing state machines.

If nextToken is returned, there are more results available. The value of nextToken is a unique pagination token for each page. Make the call again using the returned token to retrieve the next page. Keep all other arguments unchanged. Each pagination token expires after 24 hours. Using an expired pagination token will return an HTTP 400 InvalidToken error.

This operation is eventually consistent. The results are best effort and may not reflect very recent updates and changes.

OnInit
./lib/actions/ListStateMachines.js
OnStartup
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OnClose
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Attributes

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ListTagsForResource

List tags for a given resource.

OnInit
./lib/actions/ListTagsForResource.js
OnStartup
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OnClose
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Attributes

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SendTaskFailure

Used by workers to report that the task identified by the taskToken failed.

OnInit
./lib/actions/SendTaskFailure.js
OnStartup
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OnClose
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Attributes

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SendTaskHeartbeat

Used by workers to report to the service that the task represented by the specified taskToken is still making progress. This action resets the Heartbeat clock. The Heartbeat threshold is specified in the state machine's Amazon States Language definition. This action does not in itself create an event in the execution history. However, if the task times out, the execution history contains an ActivityTimedOut event.

The Timeout of a task, defined in the state machine's Amazon States Language definition, is its maximum allowed duration, regardless of the number of SendTaskHeartbeat requests received.

This operation is only useful for long-lived tasks to report the liveliness of the task.

OnInit
./lib/actions/SendTaskHeartbeat.js
OnStartup
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OnClose
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Attributes

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SendTaskSuccess

Used by workers to report that the task identified by the taskToken completed successfully.

OnInit
./lib/actions/SendTaskSuccess.js
OnStartup
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OnClose
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Attributes

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StartExecution

Starts a state machine execution.

StartExecution is idempotent. If StartExecution is called with the same name and input as a running execution, the call will succeed and return the same response as the original request. If the execution is closed or if the input is different, it will return a 400 ExecutionAlreadyExists error. Names can be reused after 90 days.

OnInit
./lib/actions/StartExecution.js
OnStartup
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OnClose
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Attributes

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StopExecution

Stops an execution.

OnInit
./lib/actions/StopExecution.js
OnStartup
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OnClose
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Attributes

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TagResource

Add a tag to a Step Functions resource.

OnInit
./lib/actions/TagResource.js
OnStartup
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OnClose
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Attributes

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UntagResource

Remove a tag from a Step Functions resource

OnInit
./lib/actions/UntagResource.js
OnStartup
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OnClose
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Attributes

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UpdateStateMachine

Updates an existing state machine by modifying its definition and/or roleArn. Running executions will continue to use the previous definition and roleArn. You must include at least one of definition or roleArn or you will receive a MissingRequiredParameter error.

All StartExecution calls within a few seconds will use the updated definition and roleArn. Executions started immediately after calling UpdateStateMachine may use the previous state machine definition and roleArn.

OnInit
./lib/actions/UpdateStateMachine.js
OnStartup
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OnClose
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Attributes

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