shoney.arickathil
994d151a44
- http/parse.wo: bounded-read buffering to the header terminator, then
exactly Content-Length body bytes; %XX decoding ('+' = space in query
strings only, malformed escapes pass through — parsing stays total);
path/query split with decoded pairs; header names lowercased; the
three-state Parsed record (closed / malformed / request) with keep-alive
carry-over — bytes past this request belong to the next one on the
connection.
- http/serve.wo: Dispatcher interface (the router's seam), status/reason
serialization with computed Content-Length, and the blocking loop:
malformed -> 400 + close; a trapping handler -> 500 AND the loop lives;
fds closed on every path; env.stopping() honored.
- Connection policy discovered by probing, not assumed: a parked keep-alive
connection BLOCKS accept on a single-threaded server (probe: client 1
idles open, client 2 starves). Policy: serve PIPELINED requests on one
connection (carry non-empty), close when the client would idle; a proxy
reconnects. README states it.
Verified against a throwaway echo app (not committed): %20 query decode;
two pipelined requests -> two responses on one connection; DIV0 handler ->
500 and the NEXT connection served; GARBAGE -> 400; SIGTERM stops clean.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
80 lines
2.8 KiB
Text
80 lines
2.8 KiB
Text
-- http/serve.wo — response serialization + the blocking keep-alive serve
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-- loop. The dispatch seam is the Dispatcher interface (the router's App
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-- satisfies it, Task 3); it is wrapped in `try`, so a trapping handler
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-- answers 500 and the loop lives — a bad request must never kill the
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-- server. Every accept path closes its fd; `env.stopping()` is honored
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-- between connections and between keep-alive requests (a SIGTERM landing
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-- in a blocking call already unwinds cleanly — the runtime's stop story).
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use net
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use env
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pub interface Dispatcher {
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fn dispatch(req: Req) -> Resp
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}
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fn status_text(code: Int) -> Text {
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switch code {
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case 200: return "OK";
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case 201: return "Created";
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case 302: return "Found";
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case 400: return "Bad Request";
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case 401: return "Unauthorized";
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case 404: return "Not Found";
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case 409: return "Conflict";
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case 500: return "Internal Server Error";
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default: return "Status";
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}
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}
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pub fn serialize(resp: Resp, keep: Bool) -> Text {
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let head = "HTTP/1.1 ${resp.status} ${status_text(resp.status)}\r\n";
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for k, v in resp.headers {
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head = head .. "${k}: ${v}\r\n";
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}
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if keep {
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head = head .. "Connection: keep-alive\r\n";
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} else {
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head = head .. "Connection: close\r\n";
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}
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head = head .. "Content-Length: ${len(resp.body)}\r\n\r\n";
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return head .. resp.body;
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}
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pub fn serve(host: Text, port: Int, d: Dispatcher) -> Int {
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let srv = net.listen(host, port);
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print("listening on ${host}:${port}");
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while true {
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if env.stopping() { net.close(srv); return 0; }
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let c = net.accept(srv);
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let carry = "";
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let alive = true;
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while alive {
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if env.stopping() { alive = false; continue; }
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let p = try parse_request(c, carry) catch (e) nil; -- an IO trap = gone
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if p == nil { alive = false; continue; }
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if p.closed { alive = false; continue; }
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if p.ok == false {
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try net.write(c, serialize(bad_request("malformed request"), false)) catch (e) {}
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alive = false;
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continue;
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}
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let r = p.req;
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if r == nil { alive = false; continue; }
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carry = p.rest;
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-- Connection policy for a single-threaded server: serve PIPELINED
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-- requests on one connection (bytes already buffered), but close when
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-- the client would idle — a parked keep-alive connection would block
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-- `accept` and starve every other client. A proxy in front simply
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-- reconnects; this is the honest shape until shards/fibers (8/11).
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let keep = len(carry) > 0;
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let conn = r.headers["connection"];
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if conn != nil {
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if to_lower(conn) == "close" { keep = false; }
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}
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let resp = try d.dispatch(r) catch (e) server_error();
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try net.write(c, serialize(resp, keep)) catch (e) { alive = false; }
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if keep == false { alive = false; }
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}
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net.close(c);
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}
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}
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