EventBridge (Event Router)

EventBridge is an Event router that routes events based on rules.

AWS EventBridge is a serverless event bus service provided by Amazon Web Services (AWS). It's designed to facilitate event-driven communication between applications. Here's a comprehensive overview:

Key Features:

1. Event Routing

   • Routes events from AWS services, SaaS applications, and custom applications to target services

   • Supports up to 10,000 events/second per account

   • Maximum event size of 256KB

2. Serverless Architecture

   • Fully managed service with no infrastructure to maintain

   • Auto-scaling based on event volume

   • Pay-per-event pricing model

3. Event Pattern Matching

   • Content-based filtering using JSON-based event patterns

   • Support for exact value matching and content filtering

   • Prefix and suffix matching capabilities

   • Numeric and IP address range comparisons

4. Target Management

   • Multiple targets per rule (up to 5 targets per rule)

   • Supported targets include AWS services (Lambda, SNS, SQS, Step Functions)

   • API destinations for HTTP endpoints

   • Retry policies and dead-letter queues for failed deliveries

5. Event Buses

   • Default event bus for AWS services

   • Custom event buses for application-specific events

   • Partner event buses for SaaS integration

   • Resource-based policies for access control

1. Schema Registry

   • Automatic schema inference from events

   • Schema versioning support

   • Code bindings generation for popular programming languages

   • OpenAPI schema support

2. Integration Capabilities

   • Native integration with 100+ AWS services

   • SaaS provider integration (e.g., Zendesk, DataDog)

   • Custom integration via API destinations

   • Support for CloudFormation and Infrastructure as Code

3. Cross-Account Features

   • Event sharing across AWS accounts

   • Organization-wide event management

   • Resource-based permissions for fine-grained access control

Common Use Cases:

• Microservices communication

• Application monitoring and alerting

• Workflow automation

• SaaS integration

• Audit and compliance tracking

• IoT data processing

• Real-time analytics triggers

This service is fundamental for building decoupled, event-driven architectures that need reliable event delivery with sophisticated routing and filtering capabilities.

Delivery of events

1. Event Delivery:

• EventBridge attempts to deliver the event to the target

• The target service can reject/fail to process the event

• By default, EventBridge will retry failed deliveries for up to 24 hours

1. Error Handling Options:

yamlCopy# Example EventBridge rule with DLQ configuration
EventRule:
  Type: AWS::Events::Rule
  Properties:
    DeadLetterConfig:
      Arn: !GetAtt DLQueue.Arn
    Targets:
      - Id: "MyLambdaTarget"
        Arn: !GetAtt MyLambda.Arn
        RetryPolicy:
          MaximumRetryAttempts: 3
          MaximumEventAgeInSeconds: 3600

1. You can configure:

• Dead Letter Queues (DLQ) for failed events

• Retry policies (attempts and duration)

• Maximum event age

• Custom error handling in target services

1. Common Target Responses:

• Lambda functions can throw errors

• SQS queues might be full

• API endpoints might return error codes

• State Machines might fail execution

Best Practices:

1. Always configure DLQs for important events

2. Implement idempotent processing in targets

3. Monitor failed deliveries and DLQ metrics

4. Set appropriate retry policies based on your use case

Example