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Description:

awscdk.awsioteventsactionsalpha 2.159.0a0

Actions for AWS::IoTEvents Detector Model
---

The APIs of higher level constructs in this module are experimental and under active development.
They are subject to non-backward compatible changes or removal in any future version. These are
not subject to the Semantic Versioning model and breaking changes will be
announced in the release notes. This means that while you may use them, you may need to update
your source code when upgrading to a newer version of this package.

This library contains integration classes to specify actions of state events of Detector Model in @aws-cdk/aws-iotevents-alpha.
Instances of these classes should be passed to State defined in @aws-cdk/aws-iotevents-alpha
You can define built-in actions to use a timer or set a variable, or send data to other AWS resources.
This library contains integration classes to use a timer or set a variable, or send data to other AWS resources.
AWS IoT Events can trigger actions when it detects a specified event or transition event.
Currently supported are:

Use timer
Set variable to detector instance
Invoke a Lambda function

Use timer
The code snippet below creates an Action that creates the timer with duration in seconds.
# Example automatically generated from non-compiling source. May contain errors.
import aws_cdk.aws_iotevents_alpha as iotevents
import aws_cdk.aws_iotevents_actions_alpha as actions

# input: iotevents.IInput

state = iotevents.State(
state_name="MyState",
on_enter=[iotevents.Event(
event_name="test-event",
condition=iotevents.Expression.current_input(input),
actions=[
actions.SetTimerAction("MyTimer", {
"duration": cdk.Duration.seconds(60)
})
]
)]
)

Setting duration by IoT Events Expression:
# Example automatically generated from non-compiling source. May contain errors.
actions.SetTimerAction("MyTimer",
duration_expression=iotevents.Expression.input_attribute(input, "payload.durationSeconds")
)

And the timer can be reset and cleared. Below is an example of general
Device HeartBeat
Detector Model:
# Example automatically generated from non-compiling source. May contain errors.
online = iotevents.State(
state_name="Online",
on_enter=[{
"event_name": "enter-event",
"condition": iotevents.Expression.current_input(input),
"actions": [
actions.SetTimerAction("MyTimer",
duration=cdk.Duration.seconds(60)
)
]
}],
on_input=[{
"event_name": "input-event",
"condition": iotevents.Expression.current_input(input),
"actions": [
actions.ResetTimerAction("MyTimer")
]
}],
on_exit=[{
"event_name": "exit-event",
"actions": [
actions.ClearTimerAction("MyTimer")
]
}]
)
offline = iotevents.State(state_name="Offline")

online.transition_to(offline, when=iotevents.Expression.timeout("MyTimer"))
offline.transition_to(online, when=iotevents.Expression.current_input(input))

Set variable to detector instance
The code snippet below creates an Action that set variable to detector instance
when it is triggered.
import aws_cdk.aws_iotevents_alpha as iotevents
import aws_cdk.aws_iotevents_actions_alpha as actions

# input: iotevents.IInput

state = iotevents.State(
state_name="MyState",
on_enter=[iotevents.Event(
event_name="test-event",
condition=iotevents.Expression.current_input(input),
actions=[
actions.SetVariableAction("MyVariable",
iotevents.Expression.input_attribute(input, "payload.temperature"))
]
)]
)

Invoke a Lambda function
The code snippet below creates an Action that invoke a Lambda function
when it is triggered.
import aws_cdk.aws_iotevents_alpha as iotevents
import aws_cdk.aws_iotevents_actions_alpha as actions
import aws_cdk.aws_lambda as lambda_

# input: iotevents.IInput
# func: lambda.IFunction

state = iotevents.State(
state_name="MyState",
on_enter=[iotevents.Event(
event_name="test-event",
condition=iotevents.Expression.current_input(input),
actions=[actions.LambdaInvokeAction(func)]
)]
)