Serverless AWS Lambda Development · レッスン

Amazon EventBridgeとの統合

Amazon EventBridgeを活用してイベントバスを構築し、さまざまなソースからのイベントをルーティングして、AWSアカウント全体で強力なイベント駆動型統合を作成します。

「Amazon EventBridgeとの統合」はCoddyKit上の無料Serverless AWS Lambda Developmentレッスンです。これはレッスン2/4です。下記で完全なレッスンを無料で読むことができます。その後、ブラウザ内の組み込みコードエディタと24時間対応のAIチューターでハンズオン演習できます。これはServerless AWS Lambda Development学習パスの一部であり、ウェブとCoddyKitアプリ全体で進捗が同期されます。 Serverless AWS Lambda Developmentコースには全4レッスンが含まれています。

このレッスンの一部はまだ翻訳されておらず、英語で表示されています。

What is Amazon EventBridge?

Welcome to a deeper dive into event-driven architectures! Today, we'll explore Amazon EventBridge, a powerful service that acts as a central nervous system for your serverless applications.

EventBridge is a serverless event bus that makes it easy to connect applications together using data from your own apps, Software-as-a-Service (SaaS) applications, and AWS services.

EventBridge Core Concepts

EventBridge operates on a few key concepts:

Event Bus: A pipeline that receives events. There's a Default Event Bus for AWS service events, and you can create Custom Event Buses.
Rules: Filters that match incoming events based on their content (event patterns).
Targets: The AWS services or endpoints that an event is sent to when a rule matches.

The Default Event Bus

Every AWS account automatically has a Default Event Bus. This bus receives events from over 200 AWS services, like S3, EC2, Lambda, and CloudTrail.

You don't need to configure these sources; they publish events to the default bus automatically. This allows you to react to changes and activities across your AWS environment without custom code.

Custom Event Buses & Sources

While the default bus handles AWS events, you can create Custom Event Buses to manage events from your own applications or third-party SaaS providers.

This allows you to centralize event routing for your entire ecosystem. Event sources can be:

AWS Services: (via Default Bus)
SaaS Partners: (e.g., Zendesk, Shopify)
Custom Applications: Your own microservices or monoliths.

Creating Event Patterns (Rules)

Rules are how EventBridge knows which events to route where. Each rule has an event pattern, a JSON structure that defines the criteria an event must meet to be matched.

Event patterns can match specific fields, prefixes, or even check for the existence of fields. They are highly flexible for filtering.

Event Pattern Example

Here's an example of an event pattern that matches any PutObject operation on an S3 bucket:

This pattern ensures only S3 object creation events trigger the rule.

{
  "source": ["aws.s3"],
  "detail-type": ["AWS API Call via CloudTrail"],
  "detail": {
    "eventSource": ["s3.amazonaws.com"],
    "eventName": ["PutObject"]
  }
}

EventBridge Targets

Once an event matches a rule, EventBridge sends it to one or more targets. Targets are the downstream services that process the event.

Common targets include:

AWS Lambda functions
Amazon SQS queues
Amazon SNS topics
AWS Step Functions state machines
Kinesis streams
and many more!

Lambda as an EventBridge Target

Lambda functions are a very common target for EventBridge. When a rule matches an event, EventBridge invokes your Lambda function, passing the event data as the input.

This allows you to build highly responsive, event-driven microservices that react to changes across your AWS environment or custom applications.

Handling EventBridge Events in Lambda

Let's look at a Python Lambda function designed to receive and process an EventBridge event. The event parameter will contain the full JSON event payload.

We'll simulate an S3 PutObject event for demonstration.

import json

def lambda_handler(event, context):
    print("Received event from EventBridge:")
    print(json.dumps(event, indent=2))

    source = event.get('source')
    detail_type = event.get('detail-type')

    if source == 'aws.s3' and detail_type == 'AWS API Call via CloudTrail':
        bucket_name = event['detail']['requestParameters']['bucketName']
        object_key = event['detail']['requestParameters']['key']
        print(f"S3 PutObject event detected for bucket: {bucket_name}, key: {object_key}")
    else:
        print(f"Unknown event source: {source}, detail-type: {detail_type}")

    return {
        'statusCode': 200,
        'body': json.dumps('Event processed successfully!')
    }

# Simulate a local invocation for testing
if __name__ == '__main__':
    sample_s3_event = {
        "version": "0",
        "id": "c6183e20-7f51-4091-8656-e23a31c51e0f",
        "detail-type": "AWS API Call via CloudTrail",
        "source": "aws.s3",
        "account": "123456789012",
        "time": "2023-10-27T10:00:00Z",
        "region": "us-east-1",
        "resources": [],
        "detail": {
            "eventSource": "s3.amazonaws.com",
            "eventName": "PutObject",
            "requestParameters": {
                "bucketName": "my-cool-bucket",
                "key": "new-image.jpg"
            }
        }
    }
    print("--- Simulating Lambda with EventBridge event ---")
    lambda_handler(sample_s3_event, None)
    print("--- Simulation complete ---")

EventBridge Quick Check

You want to trigger a Lambda function whenever a new user signs up in your custom application. Your application publishes a UserSignedUp event to your custom event bus.

Which of the following event patterns would correctly match this specific event?

Recap: EventBridge Power

In this lesson, we explored Amazon EventBridge, understanding its role as a central event bus for your serverless applications. You learned about:

Event Buses: Default, Custom, and Partner.
Rules: Using event patterns to filter events.
Targets: Sending matched events to services like Lambda.
How to integrate Lambda to process EventBridge events.

EventBridge is key to building scalable, loosely coupled, and responsive event-driven architectures.

よくある質問

「Amazon EventBridgeとの統合」レッスンは無料ですか？

はい。「Amazon EventBridgeとの統合」の完全なテキストはこのウェブで無料で読めます。インタラクティブに演習し（組み込みコードエディタと24時間対応のAIチューター）、Serverless AWS Lambda Developmentコースの残りをアンロックするには、CoddyKit PROにアップグレードしてください。 Serverless AWS Lambda Developmentコースには全4レッスンが含まれています。

「Amazon EventBridgeとの統合」で何を学びますか？

Amazon EventBridgeを活用してイベントバスを構築し、さまざまなソースからのイベントをルーティングして、AWSアカウント全体で強力なイベント駆動型統合を作成します。ブラウザで直接実行するハンズオンコードでServerless AWS Lambda Developmentを演習し、24時間対応のAIチューターがレッスンを進める中での質問に答えます。

Serverless AWS Lambda Developmentを始めるのに経験は必要ですか？

事前経験は必要ありません。CoddyKitのServerless AWS Lambda Developmentは初級者から上級者向けに構成されているため、ここから始めるか最初から始めて、自分のペースで進むことができます。これはレッスン2/4です。

「Amazon EventBridgeとの統合」レッスンにはどのくらい時間がかかりますか？

ほとんどのCoddyKitレッスンは約5～10分かかります。各レッスンはコンパクトでインタラクティブなので、着実に進歩し、ウェブとアプリ全体で正確に前回の場所から再開できます。

このServerless AWS Lambda Developmentレッスンでコードを書いて実行できますか？

はい。すべてのServerless AWS Lambda Developmentレッスンに組み込みコードエディタが含まれているため、ブラウザでリアルコードを書いて実行し、即座のAIフィードバックを取得できます。ローカル設定は不要です。

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