writeonce/docs/examples/writeonce-framework/README.md
shoney.arickathil 3d33b7bf58 feat(framework): v1 polish — helpers, 405+Allow, HEAD, Logging, set_header
- App.get/post/put/delete_(pattern, take h: Handler) — the take-interface
  shape probe-proven release + ASan before landing; retires plan-16
  deviation 1; delete_ because delete is the query keyword
- dispatch matches path-first: wrong method on a known path answers 405
  with Allow in registration order; unknown path stays 404
- HEAD routed as GET, body suppressed, Content-Length names the body a
  GET would carry (serialize gains head_only)
- Logging middleware (request line to stderr) ships in router/
- set_header(mut r, name, value) — the builder escape hatch
- web-app registers through the helpers (dogfood); README documents all
- gate grows 14 -> 16: 405+Allow, HEAD-vs-GET content-length equality
- all gates green: web-app 16/0, woc-test 540/0, oop-e2e 89/0,
  deps-accept 8/0, log-watcher 7/0, employee 8/0
- board/story: iteration 17 parked (spec+plan ready on library-internal),
  16 carries the v1-polish landing, order list updated

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-08-20 03:04:57 +02:00

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2.9 KiB
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# writeonce-framework
A web framework **written in writeonce**, consumed as a `[deps]` dependency
(iteration 15). Spec: `docs/superpowers/specs/2026-08-18-web-framework-design.md` §B.
```toml
[deps]
writeonce-framework = { git = "https://github.com/shoneyj/writeonce-framework", rev = "v0.1.0" }
```
## What it is
- **HTTP/1.1** server core (`http/`): request parsing (`Content-Length`
bodies, %-decoded paths and query strings), response serialization, a
blocking serve loop that answers 400 to malformed requests, 500 to
trapping handlers (and survives), closes every fd, and honors SIGTERM.
Connection policy: **pipelined requests are served on one connection;
idle connections close after the response** — on a single-threaded server
a parked keep-alive connection would block `accept` and starve every
other client, so closing is the correct shape until shards/fibers (8/11).
A proxy in front simply reconnects.
- **Router** (`router/`): method + path table with `:param` captures into
`req.params`; first match wins; a known path with the wrong method is
**405 with the `Allow` header** (registration order); no matching path is
the framework's 404. **HEAD is served free**: routed as GET, body
suppressed, `Content-Length` still names the body a GET would carry.
- **Registration helpers**: `app.get/post/put/delete_(pattern, handler)`
push the route for you (`delete_` because `delete` is the query
keyword); `app.add(Route { ... })` stays for anything else. A
request-line `Logging` middleware ships in `router/`, and
`set_header(resp, name, value)` is the escape hatch for headers the
builders don't set.
- **Handlers without closures**: the language has no function values by
doctrine, so a route handler is a class satisfying the `Handler` interface
(`fn handle(req: Req) -> Resp`), dispatched structurally — a
non-conforming handler is a compile error (WO-E205). Middleware is its own
interface (`fn before(req: Req) -> ?Resp`; nil = continue, a `Resp`
short-circuits).
- **Data layer for free**: handlers use `@table` + the query surface
directly — durable, compiler-checked persistence in the same binary. No
ORM, no database server.
## Honest limits (v1, all deliberate)
- **Single-threaded, blocking** — one request at a time. Concurrency arrives
underneath this same surface with the shard/fiber iterations (8/11).
- **TLS: none, anywhere.** Deploy behind nginx/caddy; the proxy terminates
TLS+ALPN and gives browsers HTTP/2 while this backend speaks HTTP/1.1
keep-alive. See the web-app sample's README for the nginx sketch.
- `Content-Length` bodies only (no chunked encoding), no WebSockets/SSE,
JSON-first (no templates).
## The consuming sample
`docs/examples/web-app` — a small storefront importing this framework
through `[deps]`. Its acceptance (`just web-app`) exercises the whole chain:
fetch → lock → build → serve → durable restart.