The Knights Who Say NIO: SwiftNIO in Depth

on YouTube ↗40m

" summary

Built a working MQTT broker on SwiftNIO using channels, pipelines, and event loop groups, with a ByteToMessageDecoder/encoder for MQTT’s fixed header and remaining-length parsing, and tests run via EmbeddedChannel decoder verifier. Core data uses ByteBuffer copy-on-write to avoid allocations; published messages use an encode-once outbound optimization to reuse one encoded buffer for thousands of subscribers. Implementation compiles, passes parser tests, and took about 40 hours; enterprise brokers can scale to ~10 million connections.

AI-written summary · about

" chapters (23)

1. 0:00Intro
2. 0:15MQTT
3. 2:02MQTT Packet Structure
4. 3:20Ping Packet Structure
5. 4:31What is SwiftNIO
6. 5:26Event Loops
7. 7:36Channel
8. 8:40Pipeline
9. 9:40Channel Handler Protocol
10. 10:36Channel Outbound Inbound Events
11. 12:23Channel Handler Context
12. 13:19What is NIO
13. 14:30bytebuffer
14. 15:52bytebuffer implementation
15. 17:08channelread implementation
16. 19:32bytemessage decoder
17. 22:42bootstrap
18. 24:58plan
19. 26:09packet decoder
20. 29:26parsing packets
21. 31:17packet encoder
22. 33:29outbound optimisation
23. 35:17NIO tests

" related talks

• 22mEvent driven networking for SwiftNorman Maurer · try! Swift Tokyo 2018
• 05mSwift Superpowers #2David Bonnet · FrenchKit 2019
• 18mImplementing JSON-RPC with SwiftNIOTom Doron · dotSwift 2019
• 21mSwift NIO, Vapor, and Server ConcurrencyLogan Wright · try! Swift NYC 2018
• 52mA C++ MQTT Message Broker for the EnterpriseJohn Dubchak · CppCon 2016
• 27mBuilding the Server-side Swift ecosystemIan Partridge · try! Swift NYC 2019
• 23mIntroduction to AsyncHTTPClientTom Doron · try! Swift NYC 2019
• 22mBuilding a Social Network in SwiftIan Partridge, David Okun · try! Swift Tokyo 2019