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CDK Constructs for AWS SNS

Project description

Amazon Simple Notification Service Construct Library

---

cfn-resources: Stable

cdk-constructs: Stable


Add an SNS Topic to your stack:

# Example automatically generated without compilation. See https://github.com/aws/jsii/issues/826
import aws_cdk.aws_sns as sns

topic = sns.Topic(self, "Topic",
    display_name="Customer subscription topic"
)

Subscriptions

Various subscriptions can be added to the topic by calling the .addSubscription(...) method on the topic. It accepts a subscription object, default implementations of which can be found in the @aws-cdk/aws-sns-subscriptions package:

Add an HTTPS Subscription to your topic:

# Example automatically generated without compilation. See https://github.com/aws/jsii/issues/826
import aws_cdk.aws_sns_subscriptions as subs

my_topic = sns.Topic(self, "MyTopic")

my_topic.add_subscription(subs.UrlSubscription("https://foobar.com/"))

Subscribe a queue to the topic:

# Example automatically generated without compilation. See https://github.com/aws/jsii/issues/826
my_topic.add_subscription(subs.SqsSubscription(queue))

Note that subscriptions of queues in different accounts need to be manually confirmed by reading the initial message from the queue and visiting the link found in it.

Filter policy

A filter policy can be specified when subscribing an endpoint to a topic.

Example with a Lambda subscription:

# Example automatically generated without compilation. See https://github.com/aws/jsii/issues/826
my_topic = sns.Topic(self, "MyTopic")
fn = lambda.Function(self, "Function", ...)

# Lambda should receive only message matching the following conditions on attributes:
# color: 'red' or 'orange' or begins with 'bl'
# size: anything but 'small' or 'medium'
# price: between 100 and 200 or greater than 300
# store: attribute must be present
topic.add_subscription(subs.LambdaSubscription(fn,
    filter_policy={
        "color": sns.SubscriptionFilter.string_filter(
            whitelist=["red", "orange"],
            match_prefixes=["bl"]
        ),
        "size": sns.SubscriptionFilter.string_filter(
            blacklist=["small", "medium"]
        ),
        "price": sns.SubscriptionFilter.numeric_filter(
            between={"start": 100, "stop": 200},
            greater_than=300
        ),
        "store": sns.SubscriptionFilter.exists_filter()
    }
))

DLQ setup for SNS Subscription

CDK can attach provided Queue as DLQ for your SNS subscription. See the SNS DLQ configuration docs for more information about this feature.

Example of usage with user provided DLQ.

# Example automatically generated without compilation. See https://github.com/aws/jsii/issues/826
topic = sns.Topic(stack, "Topic")
dl_queue = Queue(stack, "DeadLetterQueue",
    queue_name="MySubscription_DLQ",
    retention_period=cdk.Duration.days(14)
)

sns.Subscription(stack, "Subscription",
    endpoint="endpoint",
    protocol=sns.SubscriptionProtocol.LAMBDA,
    topic=topic,
    dead_letter_queue=dl_queue
)

CloudWatch Event Rule Target

SNS topics can be used as targets for CloudWatch event rules.

Use the @aws-cdk/aws-events-targets.SnsTopic:

# Example automatically generated without compilation. See https://github.com/aws/jsii/issues/826
import aws_cdk.aws_events_targets as targets

code_commit_repository.on_commit(targets.SnsTopic(my_topic))

This will result in adding a target to the event rule and will also modify the topic resource policy to allow CloudWatch events to publish to the topic.

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