Rustly typed APIs; ... JSON RPC with Rust, Procedural macros and a DSL
summary
Procedural macros parse a custom DSL to generate JSON‑RPC client and server Rust code: typed traits, authorization checks, OpenRPC schemas and a Tower middleware stack; the generator is a few thousand lines of parser and codegen but produces a client proxy that compiles to WebAssembly so front end and back end share the same types, enabling compile‑time type safety and an in‑process Oxide test client that caught a real cancellation bug.
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chapters (14)
- 0:00Rust procedural macros intro
- 2:18What are procedural macros
- 7:20JSON RPC protocol basics
- 9:52Custom DSL for APIs
- 12:47API definition language design
- 15:42DSL to Rust code transform
- 18:53Compile-time API safety
- 21:42Typed client proxies
- 23:27Testing with in-memory HTTP
- 25:13Extending DSL to REST
- 26:37Type-safe frontend with WASM
- 28:27Macros pros and cons
- 30:10Macro complexity costs
- 30:52Q&A
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