Note_Tech

All technological notes.

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AWS - EventBridge

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• AWS - EventBridge
  • Amazon EventBridge
    • Event Bus
  • Schema Registry
  • Resource-based Policy
  • Hands-on

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Amazon EventBridge

• formerly CloudWatch Events

• Usage:

  • Schedule: Cron jobs (scheduled scripts)

• Event Pattern: Event rules to react to a service doing something

• Trigger Lambda functions, send SQS/SNS messages…

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Event Bus

• event bus

  • a mediator that transfers a message from a sender to a receiver.
  • it provides a loosely coupled communication way between objects, services and applications.
  • The main idea is delivering and processing events asynchronously.

• Types of event bus:

  • Default Event Bus
    • AWS Services
  • Partner Event Bus
    • AWS Saas Partners
  • Custom Evnet Bus
    • Cusom Apps

• Event buses can be accessed by other AWS accounts using Resource-based Policies

• Archive Event

  • You can archive events (all/filter) sent to an event bus (indefinitely or set period)
  • Ability to replay archived events

• sample:

  • A company has a running Serverless application on AWS which uses EventBridge as an inter-communication channel between different services within the application. There is a requirement to use the events in the prod environment in the dev environment to make some tests. The tests will be done every 6 months, so the events need to be stored and used later on. What is the most efficient and cost-effective way to store EventBridge events and use them later?
    • use EventBridge Archive and Replay feature.

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Schema Registry

• Evnets are in JSON format.

• EventBridge can analyze the events in your bus and infer the schema
• Schema Registry
  • allows you to generate code for your application, that will know in advance how data is structured in the event bus. 知道 schema,就知道如何 extract data.
• Schema can be versioned.

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Resource-based Policy

• Resource-based Policy

  • used to manage permissions for a specific Event Bus

  • ie: allow/deny events from another AWS account or AWS region

• Use case:

  • a centrol event bus to aggregate all events from your AWS Organization in a single AWS account or AWS region EventBridge – Resource-based Policy

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Hands-on

• Create event bus

• Create rule
  • Any ec2 instance is stoped or terminated, the SNS topic will send email.
  • 已实测通过.

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