AWS StepFunctions

Since Camel 4.0

Only producer is supported

The AWS2 Step Functions component supports the following operations on AWS Step Functions:

  • Create, delete, update, describe, list state machines.

  • Create, delete, describe, list activities.

  • Start, start sync, stop, list, describe executions.

  • Get activities task.

  • Get execution history

Prerequisites

You must have a valid Amazon Web Services developer account, and be signed up to use Amazon Step Functions. More information is available at AWS Step Functions.

URI Format

aws2-step-functions://label[?options]

You can append query options to the URI in the following format:

?options=value&option2=value&…​

Configuring Options

Camel components are configured on two separate levels:

  • component level

  • endpoint level

Configuring Component Options

At the component level, you set general and shared configurations that are, then, inherited by the endpoints. It is the highest configuration level.

For example, a component may have security settings, credentials for authentication, urls for network connection and so forth.

Some components only have a few options, and others may have many. Because components typically have pre-configured defaults that are commonly used, then you may often only need to configure a few options on a component; or none at all.

You can configure components using:

  • the Component DSL.

  • in a configuration file (application.properties, *.yaml files, etc).

  • directly in the Java code.

Configuring Endpoint Options

You usually spend more time setting up endpoints because they have many options. These options help you customize what you want the endpoint to do. The options are also categorized into whether the endpoint is used as a consumer (from), as a producer (to), or both.

Configuring endpoints is most often done directly in the endpoint URI as path and query parameters. You can also use the Endpoint DSL and DataFormat DSL as a type safe way of configuring endpoints and data formats in Java.

A good practice when configuring options is to use Property Placeholders.

Property placeholders provide a few benefits:

  • They help prevent using hardcoded urls, port numbers, sensitive information, and other settings.

  • They allow externalizing the configuration from the code.

  • They help the code to become more flexible and reusable.

The following two sections list all the options, firstly for the component followed by the endpoint.

Component Options

The AWS StepFunctions component supports 22 options, which are listed below.

Name Description Default Type

configuration (producer)

Component configuration.

StepFunctions2Configuration

lazyStartProducer (producer)

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

boolean

operation (producer)

Required The operation to perform. It can be listFunctions, getFunction, createFunction, deleteFunction or invokeFunction.

Enum values:

  • createStateMachine

  • deleteStateMachine

  • updateStateMachine

  • describeStateMachine

  • listStateMachines

  • createActivity

  • deleteActivity

  • describeActivity

  • getActivityTask

  • listActivities

  • startExecution

  • startSyncExecution

  • stopExecution

  • describeExecution

  • listExecutions

  • getExecutionHistory

StepFunctions2Operations

overrideEndpoint (producer)

Set the need for overriding the endpoint. This option needs to be used in combination with the uriEndpointOverride option.

false

boolean

pojoRequest (producer)

If we want to use a POJO request as body or not.

false

boolean

profileCredentialsName (producer)

If using a profile credentials provider, this parameter will set the profile name.

String

region (producer)

The region in which StepFunctions client needs to work. When using this parameter, the configuration will expect the lowercase name of the region (for example, ap-east-1) You’ll need to use the name Region.EU_WEST_1.id().

Enum values:

  • ap-south-2

  • ap-south-1

  • eu-south-1

  • eu-south-2

  • us-gov-east-1

  • me-central-1

  • il-central-1

  • ca-central-1

  • eu-central-1

  • us-iso-west-1

  • eu-central-2

  • us-west-1

  • us-west-2

  • af-south-1

  • eu-north-1

  • eu-west-3

  • eu-west-2

  • eu-west-1

  • ap-northeast-3

  • ap-northeast-2

  • ap-northeast-1

  • me-south-1

  • sa-east-1

  • ap-east-1

  • cn-north-1

  • us-gov-west-1

  • ap-southeast-1

  • ap-southeast-2

  • us-iso-east-1

  • ap-southeast-3

  • ap-southeast-4

  • us-east-1

  • us-east-2

  • cn-northwest-1

  • us-isob-east-1

  • aws-global

  • aws-cn-global

  • aws-us-gov-global

  • aws-iso-global

  • aws-iso-b-global

String

trustAllCertificates (producer)

If we want to trust all certificates in case of overriding the endpoint.

false

boolean

uriEndpointOverride (producer)

Set the overriding uri endpoint. This option needs to be used in combination with overrideEndpoint option.

String

useDefaultCredentialsProvider (producer)

Set whether the StepFunctions client should expect to load credentials through a default credentials provider or to expect static credentials to be passed in.

false

boolean

useProfileCredentialsProvider (producer)

Set whether the StepFunctions client should expect to load credentials through a profile credentials provider.

false

boolean

autowiredEnabled (advanced)

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

true

boolean

awsSfnClient (advanced)

Autowired To use an existing configured AwsStepFunctionsClient client.

SfnClient

healthCheckConsumerEnabled (health)

Used for enabling or disabling all consumer based health checks from this component.

true

boolean

healthCheckProducerEnabled (health)

Used for enabling or disabling all producer based health checks from this component. Notice: Camel has by default disabled all producer based health-checks. You can turn on producer checks globally by setting camel.health.producersEnabled=true.

true

boolean

proxyHost (proxy)

To define a proxy host when instantiating the StepFunctions client.

String

proxyPort (proxy)

To define a proxy port when instantiating the StepFunctions client.

Integer

proxyProtocol (proxy)

To define a proxy protocol when instantiating the StepFunctions client.

Enum values:

  • HTTP

  • HTTPS

HTTPS

Protocol

accessKey (security)

Amazon AWS Access Key.

String

secretKey (security)

Amazon AWS Secret Key.

String

sessionToken (security)

Amazon AWS Session Token used when the user needs to assume an IAM role.

String

useSessionCredentials (security)

Set whether the Step Functions client should expect to use Session Credentials. This is useful in a situation in which the user needs to assume an IAM role for doing operations in Step Functions.

false

boolean

Endpoint Options

The AWS StepFunctions endpoint is configured using URI syntax:

aws2-step-functions:label

With the following path and query parameters:

Path Parameters (1 parameters)

Name Description Default Type

label (producer)

Required Logical name.

String

Query Parameters (18 parameters)

Name Description Default Type

operation (producer)

Required The operation to perform. It can be listFunctions, getFunction, createFunction, deleteFunction or invokeFunction.

Enum values:

  • createStateMachine

  • deleteStateMachine

  • updateStateMachine

  • describeStateMachine

  • listStateMachines

  • createActivity

  • deleteActivity

  • describeActivity

  • getActivityTask

  • listActivities

  • startExecution

  • startSyncExecution

  • stopExecution

  • describeExecution

  • listExecutions

  • getExecutionHistory

StepFunctions2Operations

overrideEndpoint (producer)

Set the need for overriding the endpoint. This option needs to be used in combination with the uriEndpointOverride option.

false

boolean

pojoRequest (producer)

If we want to use a POJO request as body or not.

false

boolean

profileCredentialsName (producer)

If using a profile credentials provider, this parameter will set the profile name.

String

region (producer)

The region in which StepFunctions client needs to work. When using this parameter, the configuration will expect the lowercase name of the region (for example, ap-east-1) You’ll need to use the name Region.EU_WEST_1.id().

Enum values:

  • ap-south-2

  • ap-south-1

  • eu-south-1

  • eu-south-2

  • us-gov-east-1

  • me-central-1

  • il-central-1

  • ca-central-1

  • eu-central-1

  • us-iso-west-1

  • eu-central-2

  • us-west-1

  • us-west-2

  • af-south-1

  • eu-north-1

  • eu-west-3

  • eu-west-2

  • eu-west-1

  • ap-northeast-3

  • ap-northeast-2

  • ap-northeast-1

  • me-south-1

  • sa-east-1

  • ap-east-1

  • cn-north-1

  • us-gov-west-1

  • ap-southeast-1

  • ap-southeast-2

  • us-iso-east-1

  • ap-southeast-3

  • ap-southeast-4

  • us-east-1

  • us-east-2

  • cn-northwest-1

  • us-isob-east-1

  • aws-global

  • aws-cn-global

  • aws-us-gov-global

  • aws-iso-global

  • aws-iso-b-global

String

trustAllCertificates (producer)

If we want to trust all certificates in case of overriding the endpoint.

false

boolean

uriEndpointOverride (producer)

Set the overriding uri endpoint. This option needs to be used in combination with overrideEndpoint option.

String

useDefaultCredentialsProvider (producer)

Set whether the StepFunctions client should expect to load credentials through a default credentials provider or to expect static credentials to be passed in.

false

boolean

useProfileCredentialsProvider (producer)

Set whether the StepFunctions client should expect to load credentials through a profile credentials provider.

false

boolean

lazyStartProducer (producer (advanced))

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

boolean

awsSfnClient (advanced)

Autowired To use an existing configured AwsStepFunctionsClient client.

SfnClient

proxyHost (proxy)

To define a proxy host when instantiating the StepFunctions client.

String

proxyPort (proxy)

To define a proxy port when instantiating the StepFunctions client.

Integer

proxyProtocol (proxy)

To define a proxy protocol when instantiating the StepFunctions client.

Enum values:

  • HTTP

  • HTTPS

HTTPS

Protocol

accessKey (security)

Amazon AWS Access Key.

String

secretKey (security)

Amazon AWS Secret Key.

String

sessionToken (security)

Amazon AWS Session Token used when the user needs to assume an IAM role.

String

useSessionCredentials (security)

Set whether the Step Functions client should expect to use Session Credentials. This is useful in a situation in which the user needs to assume an IAM role for doing operations in Step Functions.

false

boolean

Required Step Functions component options

You have to provide the awsSfnClient in the Registry or your accessKey and secretKey to access the AWS Step Functions service.

Usage

Static credentials, Default Credential Provider and Profile Credentials Provider

You have the possibility of avoiding the usage of explicit static credentials by specifying the useDefaultCredentialsProvider option and set it to true.

The order of evaluation for Default Credentials Provider is the following:

  • Java system properties - aws.accessKeyId and aws.secretKey.

  • Environment variables - AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY.

  • Web Identity Token from AWS STS.

  • The shared credentials and config files.

  • Amazon ECS container credentials - loaded from the Amazon ECS if the environment variable AWS_CONTAINER_CREDENTIALS_RELATIVE_URI is set.

  • Amazon EC2 Instance profile credentials.

You have also the possibility of using Profile Credentials Provider, by specifying the useProfileCredentialsProvider option to true and profileCredentialsName to the profile name.

Only one of static, default and profile credentials could be used at the same time.

For more information about this you can look at AWS credentials documentation

Message Headers

The AWS StepFunctions component supports 18 message header(s), which is/are listed below:

Name Description Default Type

CamelAwsStepFunctionsOperation (producer)

Constant: OPERATION

The operation we want to perform.

String

CamelAwsStepFunctionsStateMachineName (producer)

Constant: STATE_MACHINE_NAME

The name of the state machine.

String

CamelAwsStepFunctionsStateMachineDefinition (producer)

Constant: STATE_MACHINE_DEFINITION

The Amazon States Language definition of the state machine.

String

CamelAwsStepFunctionsStateMachineType (producer)

Constant: STATE_MACHINE_TYPE

Determines whether a Standard or Express state machine is created.

String

CamelAwsStepFunctionsStateMachineRoleArn (producer)

Constant: STATE_MACHINE_ROLE_ARN

The Amazon Resource Name (ARN) of the IAM role to use for this state machine.

String

CamelAwsStepFunctionsStateMachineArn (producer)

Constant: STATE_MACHINE_ARN

The Amazon Resource Name (ARN) of state machine.

String

CamelAwsStepFunctionsStateMachinesMaxResults (producer)

Constant: STATE_MACHINES_MAX_RESULTS

The limit number of results while listing state machines.

Integer

CamelAwsStepFunctionsActivityName (producer)

Constant: ACTIVITY_NAME

The name of the state machine activity.

String

CamelAwsStepFunctionsActivityArn (producer)

Constant: ACTIVITY_ARN

The ARN of the state machine activity.

String

CamelAwsStepFunctionsActivitiesMaxResults (producer)

Constant: ACTIVITIES_MAX_RESULTS

The limit number of results while listing state machines.

Integer

CamelAwsStepFunctionsExecutionArn (producer)

Constant: EXECUTION_ARN

The Amazon Resource Name (ARN) of the execution.

String

CamelAwsStepFunctionsExecutionName (producer)

Constant: EXECUTION_NAME

Optional name of the execution.

String

CamelAwsStepFunctionsExecutionInput (producer)

Constant: EXECUTION_INPUT

The string that contains the JSON input data for the execution.

String

CamelAwsStepFunctionsExecutionTraceHeader (producer)

Constant: EXECUTION_TRACE_HEADER

Passes the X-Ray trace header.

String

CamelAwsStepFunctionsExecutionHistoryMaxResults (producer)

Constant: EXECUTION_HISTORY_MAX_RESULTS

The limit number of results while listing execution history.

Integer

CamelAwsStepFunctionsExecutionHistoryIncludeExecutionData (producer)

Constant: EXECUTION_HISTORY_INCLUDE_EXECUTION_DATA

You can select whether execution data (input or output of a history event) is returned.

Boolean

CamelAwsStepFunctionsExecutionHistoryReverseOrder (producer)

Constant: EXECUTION_HISTORY_REVERSE_ORDER

Lists events in descending order of their timeStamp.

Boolean

CamelAwsStepFunctionsExecutionMaxResults (producer)

Constant: EXECUTIONS_MAX_RESULTS

The limit number of results while listing executions.

Integer

Step Functions Producer operations

Camel-AWS Step Functions component provides the following operation on the producer side:

  • createStateMachine

  • deleteStateMachine

  • updateStateMachine

  • describeStateMachine

  • listStateMachines

  • createActivity

  • deleteActivity

  • describeActivity

  • getActivityTask

  • listActivities

  • startExecution

  • startSyncExecution

  • stopExecution

  • describeExecution

  • listExecutions

  • getExecutionHistory

Producer Examples

  • createStateMachine: this operation will create a state machine

from("direct:createStateMachine")
    .to("aws2-step-functions://test?awsSfnClient=#awsSfnClient&operation=createMachine")

Using a POJO as body

Sometimes building an AWS Request can be complex because of multiple options. We introduce the possibility to use a POJO as the body. In AWS Step Functions, there are multiple operations you can submit, as an example for Create state machine request, you can do something like:

from("direct:start")
  .setBody(CreateStateMachineRequest.builder().name("state-machine").build())
  .to("aws2-step-functions://test?awsSfnClient=#awsSfnClient&operation=createStateMachine&pojoRequest=true")

In this way, you’ll pass the request directly without the need of passing headers and options specifically related to this operation.

Dependencies

Maven users will need to add the following dependency to their pom.xml.

pom.xml

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-aws2-step-functions</artifactId>
    <version>${camel-version}</version>
</dependency>

where ${camel-version} must be replaced by the actual version of Camel.

Spring Boot Auto-Configuration

When using aws2-step-functions with Spring Boot make sure to use the following Maven dependency to have support for auto configuration:

<dependency>
  <groupId>org.apache.camel.springboot</groupId>
  <artifactId>camel-aws2-step-functions-starter</artifactId>
  <version>x.x.x</version>
  <!-- use the same version as your Camel core version -->
</dependency>

The component supports 23 options, which are listed below.

Name Description Default Type

camel.component.aws2-step-functions.access-key

Amazon AWS Access Key.

String

camel.component.aws2-step-functions.autowired-enabled

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

true

Boolean

camel.component.aws2-step-functions.aws-sfn-client

To use an existing configured AwsStepFunctionsClient client. The option is a software.amazon.awssdk.services.sfn.SfnClient type.

SfnClient

camel.component.aws2-step-functions.configuration

Component configuration. The option is a org.apache.camel.component.aws2.stepfunctions.StepFunctions2Configuration type.

StepFunctions2Configuration

camel.component.aws2-step-functions.enabled

Whether to enable auto configuration of the aws2-step-functions component. This is enabled by default.

Boolean

camel.component.aws2-step-functions.health-check-consumer-enabled

Used for enabling or disabling all consumer based health checks from this component.

true

Boolean

camel.component.aws2-step-functions.health-check-producer-enabled

Used for enabling or disabling all producer based health checks from this component. Notice: Camel has by default disabled all producer based health-checks. You can turn on producer checks globally by setting camel.health.producersEnabled=true.

true

Boolean

camel.component.aws2-step-functions.lazy-start-producer

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

Boolean

camel.component.aws2-step-functions.operation

The operation to perform. It can be listFunctions, getFunction, createFunction, deleteFunction or invokeFunction.

StepFunctions2Operations

camel.component.aws2-step-functions.override-endpoint

Set the need for overriding the endpoint. This option needs to be used in combination with the uriEndpointOverride option.

false

Boolean

camel.component.aws2-step-functions.pojo-request

If we want to use a POJO request as body or not.

false

Boolean

camel.component.aws2-step-functions.profile-credentials-name

If using a profile credentials provider, this parameter will set the profile name.

String

camel.component.aws2-step-functions.proxy-host

To define a proxy host when instantiating the StepFunctions client.

String

camel.component.aws2-step-functions.proxy-port

To define a proxy port when instantiating the StepFunctions client.

Integer

camel.component.aws2-step-functions.proxy-protocol

To define a proxy protocol when instantiating the StepFunctions client.

Protocol

camel.component.aws2-step-functions.region

The region in which StepFunctions client needs to work. When using this parameter, the configuration will expect the lowercase name of the region (for example, ap-east-1) You’ll need to use the name Region.EU_WEST_1.id().

String

camel.component.aws2-step-functions.secret-key

Amazon AWS Secret Key.

String

camel.component.aws2-step-functions.session-token

Amazon AWS Session Token used when the user needs to assume an IAM role.

String

camel.component.aws2-step-functions.trust-all-certificates

If we want to trust all certificates in case of overriding the endpoint.

false

Boolean

camel.component.aws2-step-functions.uri-endpoint-override

Set the overriding uri endpoint. This option needs to be used in combination with overrideEndpoint option.

String

camel.component.aws2-step-functions.use-default-credentials-provider

Set whether the StepFunctions client should expect to load credentials through a default credentials provider or to expect static credentials to be passed in.

false

Boolean

camel.component.aws2-step-functions.use-profile-credentials-provider

Set whether the StepFunctions client should expect to load credentials through a profile credentials provider.

false

Boolean

camel.component.aws2-step-functions.use-session-credentials

Set whether the Step Functions client should expect to use Session Credentials. This is useful in a situation in which the user needs to assume an IAM role for doing operations in Step Functions.

false

Boolean
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