Fail

class aws_cdk.aws_stepfunctions.Fail(scope, id, *, cause=None, comment=None, error=None)

Bases: State

Define a Fail state in the state machine.

Reaching a Fail state terminates the state execution in failure.

ExampleMetadata:

infused

Example:

import aws_cdk.aws_lambda as lambda_

# submit_lambda: lambda.Function
# get_status_lambda: lambda.Function


submit_job = tasks.LambdaInvoke(self, "Submit Job",
    lambda_function=submit_lambda,
    # Lambda's result is in the attribute `Payload`
    output_path="$.Payload"
)

wait_x = sfn.Wait(self, "Wait X Seconds",
    time=sfn.WaitTime.seconds_path("$.waitSeconds")
)

get_status = tasks.LambdaInvoke(self, "Get Job Status",
    lambda_function=get_status_lambda,
    # Pass just the field named "guid" into the Lambda, put the
    # Lambda's result in a field called "status" in the response
    input_path="$.guid",
    output_path="$.Payload"
)

job_failed = sfn.Fail(self, "Job Failed",
    cause="AWS Batch Job Failed",
    error="DescribeJob returned FAILED"
)

final_status = tasks.LambdaInvoke(self, "Get Final Job Status",
    lambda_function=get_status_lambda,
    # Use "guid" field as input
    input_path="$.guid",
    output_path="$.Payload"
)

definition = submit_job.next(wait_x).next(get_status).next(sfn.Choice(self, "Job Complete?").when(sfn.Condition.string_equals("$.status", "FAILED"), job_failed).when(sfn.Condition.string_equals("$.status", "SUCCEEDED"), final_status).otherwise(wait_x))

sfn.StateMachine(self, "StateMachine",
    definition=definition,
    timeout=Duration.minutes(5)
)
Parameters:

  • scope (Construct)

  • id (str)

  • cause (Optional[str]) – A description for the cause of the failure. Default: No description

  • comment (Optional[str]) – An optional description for this state. Default: No comment

  • error (Optional[str]) – Error code used to represent this failure. Default: No error code

Methods

add_prefix(x)

Add a prefix to the stateId of this state.

Parameters:

x (str)

Return type:

None

bind_to_graph(graph)

Register this state as part of the given graph.

Don’t call this. It will be called automatically when you work with states normally.

Parameters:

graph (StateGraph)

Return type:

None

to_state_json()

Return the Amazon States Language object for this state.

Return type:

Mapping[Any, Any]

to_string()

Returns a string representation of this construct.

Return type:

str

Attributes

end_states

Continuable states of this Chainable.

id

Descriptive identifier for this chainable.

node

The construct tree node associated with this construct.

start_state

First state of this Chainable.

state_id

Tokenized string that evaluates to the state’s ID.

Static Methods

classmethod filter_nextables(states)

Return only the states that allow chaining from an array of states.

Parameters:

states (Sequence[State])

Return type:

List[INextable]

classmethod find_reachable_end_states(start, *, include_error_handlers=None)

Find the set of end states states reachable through transitions from the given start state.

Parameters:

  • start (State)

  • include_error_handlers (Optional[bool]) – Whether or not to follow error-handling transitions. Default: false

Return type:

List[State]

classmethod find_reachable_states(start, *, include_error_handlers=None)

Find the set of states reachable through transitions from the given start state.

This does not retrieve states from within sub-graphs, such as states within a Parallel state’s branch.

Parameters:

  • start (State)

  • include_error_handlers (Optional[bool]) – Whether or not to follow error-handling transitions. Default: false

Return type:

List[State]

classmethod is_construct(x)

Return whether the given object is a Construct.

Parameters:

x (Any)

Return type:

bool

classmethod prefix_states(root, prefix)

Add a prefix to the stateId of all States found in a construct tree.

Parameters:
Return type:

None