Amazon Simple Notification Service Construct Library
AWS CDK v1 has reached End-of-Support on 2023-06-01.
This package is no longer being updated, and users should migrate to AWS CDK v2.
For more information on how to migrate, see the Migrating to AWS CDK v2 guide.
Add an SNS Topic to your stack:
const topic = new sns.Topic(this, 'Topic', {
displayName: 'Customer subscription topic',
});
Add a FIFO SNS topic with content-based de-duplication to your stack:
const topic = new sns.Topic(this, 'Topic', {
contentBasedDeduplication: true,
displayName: 'Customer subscription topic',
fifo: true,
topicName: 'customerTopic',
});
Note that FIFO topics require a topic name to be provided. The required .fifo
suffix will be automatically added to the topic name if it is not explicitly provided.
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:
const myTopic = new sns.Topic(this, 'MyTopic');
myTopic.addSubscription(new subscriptions.UrlSubscription('https://foobar.com/'));
Subscribe a queue to the topic:
declare const queue: sqs.Queue;
const myTopic = new sns.Topic(this, 'MyTopic');
myTopic.addSubscription(new subscriptions.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:
import * as lambda from '@aws-cdk/aws-lambda';
const myTopic = new sns.Topic(this, 'MyTopic');
declare const fn: lambda.Function;
myTopic.addSubscription(new subscriptions.LambdaSubscription(fn, {
filterPolicy: {
color: sns.SubscriptionFilter.stringFilter({
allowlist: ['red', 'orange'],
matchPrefixes: ['bl'],
}),
size: sns.SubscriptionFilter.stringFilter({
denylist: ['small', 'medium'],
}),
price: sns.SubscriptionFilter.numericFilter({
between: { start: 100, stop: 200 },
greaterThan: 300,
}),
store: sns.SubscriptionFilter.existsFilter(),
},
}));
Example of Firehose Subscription
import { DeliveryStream } from '@aws-cdk/aws-kinesisfirehose';
const topic = new sns.Topic(this, 'Topic');
declare const stream: DeliveryStream;
new sns.Subscription(this, 'Subscription', {
topic,
endpoint: stream.deliveryStreamArn,
protocol: sns.SubscriptionProtocol.FIREHOSE,
subscriptionRoleArn: "SAMPLE_ARN",
});
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.
const topic = new sns.Topic(this, 'Topic');
const dlQueue = new sqs.Queue(this, 'DeadLetterQueue', {
queueName: 'MySubscription_DLQ',
retentionPeriod: Duration.days(14),
});
new sns.Subscription(this, 'Subscription', {
endpoint: 'endpoint',
protocol: sns.SubscriptionProtocol.LAMBDA,
topic,
deadLetterQueue: dlQueue,
});
CloudWatch Event Rule Target
SNS topics can be used as targets for CloudWatch event rules.
Use the @aws-cdk/aws-events-targets.SnsTopic
:
import * as codecommit from '@aws-cdk/aws-codecommit';
import * as targets from '@aws-cdk/aws-events-targets';
declare const repo: codecommit.Repository;
const myTopic = new sns.Topic(this, 'Topic');
repo.onCommit('OnCommit', {
target: new targets.SnsTopic(myTopic),
});
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.
Topic Policy
A topic policy is automatically created when addToResourcePolicy
is called, if
one doesn't already exist. Using addToResourcePolicy
is the simplest way to
add policies, but a TopicPolicy
can also be created manually.
const topic = new sns.Topic(this, 'Topic');
const topicPolicy = new sns.TopicPolicy(this, 'TopicPolicy', {
topics: [topic],
});
topicPolicy.document.addStatements(new iam.PolicyStatement({
actions: ["sns:Subscribe"],
principals: [new iam.AnyPrincipal()],
resources: [topic.topicArn],
}));
A policy document can also be passed on TopicPolicy
construction
const topic = new sns.Topic(this, 'Topic');
const policyDocument = new iam.PolicyDocument({
assignSids: true,
statements: [
new iam.PolicyStatement({
actions: ["sns:Subscribe"],
principals: [new iam.AnyPrincipal()],
resources: [topic.topicArn],
}),
],
});
const topicPolicy = new sns.TopicPolicy(this, 'Policy', {
topics: [topic],
policyDocument,
});