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How hard could it be to take 1-1 communication with Go Channels and turn it into 1-many to enable fanout? As hard as you want to make it! In this talk, i'll walk through the problem space, how I solved it, and demonstrate some code showing how simple (or not) it can be. https://github.com/StabbyCutyou/spub
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- 1. @StabbyCutyou BROADCASTING CHANNELS WRITING ATIMEOUT-AWARE ABSTRACTIONTO ENABLE ASYNCHRONOUS FANOUT IN GO
- 3. @StabbyCutyou OUT OF BOREDOM, I ASKED MYSELF A SIMPLE QUESTION
- 4. @StabbyCutyou –Me, talking to myself “How hard would it be to make something in Go that does fanout?”
- 5. @StabbyCutyou SO, I BUILT A LIBRARY
- 6. @StabbyCutyou DEFINETHE PROBLEM - I WANT… • To enable message fanout inside of a process • To strictly stick to []byte as my message format • To make it manage subscriptions • To ensure the highest guarantee of deliverability that I can
- 7. @StabbyCutyou DEFINETHE PROBLEM - I DON’T WANT… • To manage communicating between processes • To worry about latency of the library itself • To manage the durability of the messages in flight • To manage message lifecycle • To manage complex routing logic
- 8. @StabbyCutyou THIS IS WHAT ITHOUGHT IT WOULD LOOK LIKE
- 9. @StabbyCutyou THIS IS WHAT ITHOUGHT IT WOULD LOOK LIKE
- 10. @StabbyCutyou THIS IS WHAT ITHOUGHT IT WOULD LOOK LIKE
- 11. @StabbyCutyou THIS IS WHAT I ACTUALLY ENDED UP BUILDING
- 12. @StabbyCutyou YOU MAY ASKYOURSELF How did he get here?
- 13. @StabbyCutyou WITHTHE BEST OF INTENTIONS
- 15. @StabbyCutyou THESE ARE NOT ALL GO SPECIFIC PROBLEMS
- 27. @StabbyCutyou SOLUTION Named Subscribers and a Direct Send method!
- 29. @StabbyCutyou SOLUTION An Unsubscribe method by Subscriber name!
- 31. @StabbyCutyou SOLUTION A Stop method and quit channels!
- 32. @StabbyCutyou PROBLEM 9 Broadcasting while shutting down
- 34. @StabbyCutyou I HAD 9 PROBLEMS • Potential Starvation • Timeliness • ConfigurableTimeouts • How to communicate Errors • Specialized Broadcast Failures • Enabling Retries • Unsubscribing • Graceful shutdown • Unavoidable Panics
- 35. @StabbyCutyou NIFTY BONUS PROBLEMS? • Should the errors channel be buffered or not? • And if so, 1 or >1? • What if someone wants no timeouts at all? • What if they want the lesser of the Publisher or Subscriber timeout? • What if they want the greater of it? • What if consumers try to close their channels? • They definitely should not, but what if?
- 36. @StabbyCutyou SO,WHAT DOES ALLTHIS ACTUALLY LOOK LIKE?
- 38. @StabbyCutyou THANKS! Broadcasting Channels - blah blah blah something or other in Go