SNS — Topics & Subscriptions

SNS in Floci Studio supports standard and FIFO topics, subscription management across all protocols, and a publish panel for testing message delivery.

Creating a topic

1. Click SNS in the sidebar.
2. Click Create Topic.
3. Enter a topic name (e.g., system-alerts).
4. Toggle FIFO Topic if you need ordered delivery and deduplication. The .fifo suffix is added automatically, and ContentBasedDeduplication is enabled.
5. Click Create.

Topic detail view

Click any topic card to open the drill-down. Three tabs are available:

Subscriptions tab

Lists all active subscriptions with protocol, endpoint, and confirmation status. Click Add Subscription to subscribe a new endpoint.

Supported protocols:

• email / email-json
• http / https
• sqs — paste the queue ARN
• lambda — paste the function ARN
• sms

In local emulation, all subscriptions are confirmed immediately regardless of protocol.

Publish Message tab

Send a message to the topic:

{
  "event": "high_cpu",
  "instance": "i-0abc123",
  "value": 95.2
}

An optional Subject field is available for email-protocol subscribers.

Attributes tab

Shows all topic metadata via GetTopicAttributes:

Key	Description
TopicArn	Full ARN
SubscriptionsConfirmed	Active subscriber count
SubscriptionsPending	Awaiting confirmation
FifoTopic	true if FIFO
ContentBasedDeduplication	Enabled for FIFO topics
DisplayName	Optional display name for email
KmsMasterKeyId	KMS key if encryption enabled

SDK integration

import boto3

sns = boto3.client("sns", endpoint_url="http://localhost:4566",
                   region_name="us-east-1",
                   aws_access_key_id="test", aws_secret_access_key="test")

# Create standard topic
arn = sns.create_topic(Name="system-alerts")["TopicArn"]

# Create FIFO topic
fifo_arn = sns.create_topic(
    Name="order-events.fifo",
    Attributes={"FifoTopic": "true", "ContentBasedDeduplication": "true"}
)["TopicArn"]

# Subscribe SQS
sns.subscribe(TopicArn=arn, Protocol="sqs",
              Endpoint="arn:aws:sqs:us-east-1:000000000000:my-queue")

# Publish
sns.publish(TopicArn=arn, Message='{"event": "alarm"}', Subject="Alert")