eventbridge

# AWS EventBridge

Amazon EventBridge is a serverless event bus that connects applications using events. Route events from AWS services, custom applications, and SaaS partners.

## Table of Contents

- [Core Concepts](#core-concepts)
- [Common Patterns](#common-patterns)
- [CLI Reference](#cli-reference)
- [Best Practices](#best-practices)
- [Troubleshooting](#troubleshooting)
- [References](#references)

## Core Concepts

### Event Bus

Channel that receives events. Types:
- **Default**: Receives AWS service events
- **Custom**: Your application events
- **Partner**: SaaS application events

### Rules

Match incoming events and route to targets. Each rule can have up to 5 targets.

### Event Patterns

JSON patterns that define which events match a rule.

### Targets

AWS services that receive matched events (Lambda, SQS, SNS, Step Functions, etc.).

### Scheduler

Schedule one-time or recurring events to invoke targets.

## Common Patterns

### Create Custom Event Bus and Rule

**AWS CLI:**

```bash
# Create custom event bus
aws events create-event-bus --name my-app-events

# Create rule
aws events put-rule \
  --name order-created-rule \
  --event-bus-name my-app-events \
  --event-pattern '{
    "source": ["my-app.orders"],
    "detail-type": ["Order Created"]
  }'

# Add Lambda target
aws events put-targets \
  --rule order-created-rule \
  --event-bus-name my-app-events \
  --targets '[{
    "Id": "process-order",
    "Arn": "arn:aws:lambda:us-east-1:123456789012:function:ProcessOrder"
  }]'

# Add Lambda permission
aws lambda add-permission \
  --function-name ProcessOrder \
  --statement-id eventbridge-order-created \
  --action lambda:InvokeFunction \
  --principal events.amazonaws.com \
  --source-arn arn:aws:events:us-east-1:123456789012:rule/my-app-events/order-created-rule
```

**boto3:**

```python
import boto3

events = boto3.client('events')

# Create event bus
events.create_event_bus(Name='my-app-events')

# Create rule
events.put_rule(
    Name='ord