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EventBridge Patterns and real world use case
- 1. EventBridge Patterns - Real world use case AWS User Group Stockholm 2022-03-30
- 2. Hello, I’m JIMMY DAHLQVIST Head of AWS @ Sigma Technology Cloud AWS Ambassador & Community Builder
- 4. @jimmydahlqvist Different Patterns ◦ Single Bus (Centralized) ▫ Single - Multi Account ◦ Multi Bus (Decentralized) ▫ Single – Multi Account
- 6. @jimmydahlqvist Centralized ◦ Advantages ▫ Centralized routing and resource management ▫ Easy to integrate new application ◦ Disadvantages ▫ Single point of failure ▫ Leaking business logic
- 7. @jimmydahlqvist Single Bus, Single Account Pattern ◦ Good place to start ◦ No need to handle cross account access
- 8. @jimmydahlqvist AWS account Order Service Payment Service Shipment Service
- 9. @jimmydahlqvist Single Bus, Multi Account Pattern ◦ Introduce Account boundaries ◦ Clear separation
- 10. @jimmydahlqvist AWS account Order Service Payment Service Shipment Service AWS account AWS account AWS account
- 11. @jimmydahlqvist AWS account Order Service Payment Service Shipment Service AWS account AWS account AWS account
- 13. @jimmydahlqvist Decentralized (Distributed) ◦ Advantages ▫ No single point of failure ▫ Enables autonomy ◦ Disadvantages ▫ Challenge to design ▫ More resources to manage
- 14. @jimmydahlqvist Multi Bus, Single Account Pattern ◦ Each service owns its bus ◦ No centrally managed routing
- 15. @jimmydahlqvist AWS account Order Service Payment Service Shipment Service
- 16. @jimmydahlqvist AWS account Order Service Payment Service Shipment Service
- 17. @jimmydahlqvist Multi Bus, Multi Account Pattern ◦ Clear separation of duty ◦ Can become very complex
- 18. @jimmydahlqvist Security ◦ Resource policies support all API Actions ◦ Support organization and tags
- 19. @jimmydahlqvist AWS account Order Service Payment Service Shipment Service AWS account AWS account
- 20. @jimmydahlqvist How do I choose?
- 21. @jimmydahlqvist One Rule, One Target ◦ Support for five targets per rule ◦ Coupling should be on the event not the filter
- 22. @jimmydahlqvist What about the default bus? ?
- 24. @jimmydahlqvist Our Design ◦ Twist on the Single account - multiple buses pattern ◦ Multiple Buses ▫ Use case oriented ◦ We run in a single account
- 25. @jimmydahlqvist Bus design ◦ Each bus has a single purpose ◦ Ingress / Egress data ◦ Service to service events
- 26. @jimmydahlqvist Reasons ◦ Wanted a centralized pattern ◦ Wanted separation of duty ◦ Clear what data flows where
- 27. @jimmydahlqvist Data Flows ◦ Ingress Bus ▫ Data from IoT gateways ◦ Egress Bus ▫ Data to partners ◦ Internal Bus ▫ Data / Events between services
- 28. @jimmydahlqvist Thin and Thick Events ◦ Ingress / Egress is thick events ◦ Internal is thin events
- 29. @jimmydahlqvist
- 31. @jimmydahlqvist My thoughts ◦ Start small ◦ Adapt & Evolve ◦ Do what fits your needs
- 32. Thank You!! @jimmydahlqvist https://www.linkedin.com/in/dahlqvistjimmy/ https://jimmydqv.com | https://dev.to/jimmydqv
Editor's Notes
- Talk about 2 types of patterns, centralized and de-centralized (Single / Mulyi Bus) Single and Multi Account All the patterns allow us to decouple the publisher from the subscriber. The service that publish doesn’t really need to know who is listening in the other end.
- Look at centralized advantnages and disadvantages Advantages allow you to manage all routiing, security and polciies in one place, single deployment) All routing centralized, concentrating all communication to a single event bus ( Enables central management of resources Allows you to easy integrate applications with few changes. Disadvantages As number of intregrations grow so does the complexity and resource utlilization. Can become a Single point of failure. All routing is centralized…. Prevents autonomy Single point of failure
- Caresteristics……
- In all of our patterns we have three services……. Events flow though a central bus. Handle by an infrastructure team (or similar) Easy to manage, easy to get started and easy to integrate new services. But as said before, when ## of integrations grow so does the complexity. Can hinder autonomy since there is a central managed resource, probably managed by infra team.
- Caresteristics…… Not a big fan of this.
- This is a pattern that I’m not that big of fan of. It doesn’t look that differente from the Single account? So what is wrong with it? Well it doesn’t work like this…..
- We can’t call targets, like lambda, in a different account. That is not possible. We can only target an EB in a different account. We must therefor have an EB in each account that is the target for the central bus and then have rules on each bus in each account- This quickly can become a mess and all the advantages from a Single Account Single Bus is according to me gone!
- In a decentralized approach routing is spread across multiple event buses and the publisher often becomes the logical owner of that bus. The service owns the mechanism to distribute the events. Even if more buses are more work from a operational approach it enables autonomy and doesn’t become a single point of failure On the other hand, designing distributed systems, managing all resources, can become a huge challenge if not done properly from the start. Applying this as an afterthought is almost impossible. So the time to get started might be longer, integration of new services and applications require more change and take more time.
- Caresteristics……
- Now each service own its own bus and publishes to that. Interested services can now subscribe for events in each service that they are interested in. Since we are in single account we can target resources in each service, cross service boundries. No need for extra busses, One thing that can become a problem is thar since there is no central bus, each service need to know about other services buses. This can quickly become a complex integration and onboarding new services can take time. Imagine in a system with10, 20, 100 services that you are interested in events from
- A different approach to the pattern would be to have multiple central buses and separate on data flows instead of services. This is a pattern we have adopted or invented. It come with pros and cons, but let’s talk about that later…..
- Caresteristics…… Highly autonomus Distributed systems always comes with challenges. More complex to onboard new services etc.
- Resource policy support all API Actions, except for PutPermissions. That would be really bad… Easy to reference and call PutRule, PutEvent, etc in a different account Support for tags and organisations in Resource Policy, using ABAC attribute based access control)
- Back with very clear boundries and separation of duty. Even if this would introduce more complexity with cross account access, than the Single Account multi bus I still like it more. We get a very nice separation with account boundries. Due to the need for cross account resource policies I think that handling multi busses can be come easier as it forces teams to talk to each others. And running large services, consisting of several micro services, in different accounts are a good idea.
- That is a great question! I would say there is no easy answer, it’s a classic “It depends” You need to look at your service structure, data flows, do have an infra team. You need to logically start breaking down your architecture to find the pattern that best fits your use case.
- I normally recommend that you create subscriptions, so each service that is interested in an event creates its own rule, One Rule One target. Yes there is support for 5 targets That would create coupling on filter and not event!
- NOOOOOOOO!!!! Neveer ever use the default bus. Leave that for AWS owned events! It become very messy very quickliy! My recommendation is to ALWAYS use custom buses!
- Real world use case! With our Client AssaAbloy. Connecting doors to the cloud…. Big ass doors…. Data from doors are events….. Open, close,…. Perfect match for EventBridge….
- We live in a single account We use multiple busses Twist of SA-MB patter
- Each bus has a clear purpose Separate Ingress / Egress data do create separation of business logic Internal service communication
- We wanted a centralized approach Wanted to separate data and duty…. Becomes very clear what flow where and who can / shell subscribe to what bus.
- This is a simplified image……
- Thank you! You can follow me on twitter or connect on linked in.