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WalkthroughThe change adds a shared, case-sensitive mapping for 36 HTTP method names. HTTP parsing and HTTP/2 recognition use its lookup, and non-strict wildcard routes use its method-name table. The Rust FFI lookup and local method list are removed. ChangesHTTP method lookup
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The title clearly identifies the main change: resolving request methods to IDs inline in uWS. |
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Inline comments:
Review comments at @src/http_types/Method.rs:
- Line 389: Add a build-integrated parity check connecting Rust
`Method::as_str()` names and their wire order to C++ `HTTP_METHOD_NAMES` and
`methodIdFromWire()`, so coordinated C++ substitutions cannot pass
independently; alternatively, generate both lists from one shared source.
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packages/bun-uws/src/Http2Context.hpackages/bun-uws/src/HttpContext.hpackages/bun-uws/src/HttpMethod.hpackages/bun-uws/src/HttpParser.hsrc/http_types/Method.rs
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Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.
Beyond the inline note, I also checked the two behavior-preservation concerns the deleted isValidMethod raises: an empty method is still rejected by the start == data check in consumeRequestLine before the new strict lookup runs, and in strict mode the byte loop's isStrictMethodChar already confines the token to [A-Z-], so methodIdFromWire never sees lowercase there. Every methodIs literal in HttpMethod.h has exactly the length of its enclosing case, so the fixed-width memcmp cannot over-read the request buffer; the HTTP/2 [A-Z-] pre-check was redundant with an exact byte compare. No remaining references to Bun__HTTPMethod__from, isValidMethod, or detail::supportedHttpMethods are left in the tree.
Extended reasoning...
The change replaces a Rust FFI method lookup with a header-only C++ switch in packages/bun-uws/src/HttpMethod.h, rewires the HTTP/1 strict request-line check, the HTTP/2 :method check, and the "*" route registration to it, and deletes the FFI export from src/http_types/Method.rs. It touches the HTTP request parser on untrusted network input, so method validation and the memcmp read widths were the security-relevant surface; both held up on inspection. One inline nit was posted about the third copy of the id table in BunCommonStrings.cpp, and the PR adds only a static_assert and a Rust unit test rather than a JS-level test for strict versus non-strict method acceptance, so a human look is still worthwhile given this opens a stack that will build on these ids.
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LGTM — the follow-up commit closes the one gap raised earlier (the BunCommonStrings HTTPMethod enum is now static_asserted name-by-name against HTTP_METHOD_NAMES), and the refactor checks out as behavior-preserving.
What was reviewed:
- Over-read risk in
methodIdFromWire: every literal in eachcasearm has exactly the case's length, and length 0 never reachesmemcmp, sodata()of an empty view is never dereferenced. - Old vs new accepted set: HTTP/1 non-strict still rejects empty (
start == data) and bad bytes in the scan loop; strict and HTTP/2 paths already filtered toA-Z/-before the lookup, so dropping the Rust call (which also accepted lowercase) changes nothing. - Dead code: no remaining references to
Bun__HTTPMethod__from,supportedHttpMethods, orisValidMethod; theFOR_EACH_METHODswitch still covers all 36 ids.
Extended reasoning...
The diff replaces a Rust FFI method lookup with a header-only constexpr table and switch in packages/bun-uws/src/HttpMethod.h, rewires the HTTP/1 strict check, HTTP/2 :method check, and "*" route expansion to it, deletes the FFI export and the duplicate uWS method array, and adds a static_assert plus a Rust unit test tying the two id tables together. It touches the request-line parser, which handles adversarial input, but the only new memory access is a fixed-width memcmp gated by an exact length switch that is itself round-trip-tested at compile time. No CODEOWNERS entry covers these files, there are no outstanding third-party objections, the second commit addressed the sole prior nit, and the bug hunt ran dry, which together decided approve.
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#45357 adds the request-line check of the HTTP/3 listener. It moves If #45357 lands first, the rebase here is small:
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methodIdFromWire() maps a method token to the discriminant of bun_http_types::Method with one switch on the length and compares of a fixed width. The strict (node:http) request-line check and the HTTP/2 known-method check call it in place of the Bun__HTTPMethod__from FFI call, which is removed. The accepted set is the same 36 uppercase names. isValidMethod() goes: outside strict mode it checked each byte of the method a second time, after the loop that found the method's end. The name table moves from HttpContext.h to HttpMethod.h. A static_assert there and a unit test in Method.rs hold both sides to the same order.
…_NAMES at compile time
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Status This PR changes no behaviour. It is the groundwork for #45396, which has the reproduction of the bug. The stack: #44510, #45396, #45397, #45398, #45399 (draft), #45400 (draft). CI: the diff is green. Two runs each had one red test on the Windows 11 aarch64 lane, a different test each time: |
Problem
Bun__HTTPMethod__fromis an out-of-line FFI call from the strict request-line check (packages/bun-uws/src/HttpParser.h:816) and from the HTTP/2 check (Http2Context.h:173).isValidMethodchecks each byte of the method a second time.Fix
methodIdFromWire()(packages/bun-uws/src/HttpMethod.h) maps a method to the discriminant ofbun_http_types::Method: one switch on the length, then compares of a fixed width.Bun__HTTPMethod__fromandisValidMethodgo. The accepted set is the same 36 uppercase names.static_assertand a unit test inMethod.rshold both name tables to one order. A secondstatic_assertchecks the id enum inBunCommonStrings.cppagainst the table.Behaviour change: none
Tests that cover this code:
test/js/node/http/node-http.test.ts(HPE_INVALID_METHOD),test/js/node/test/parallel/test-http-server-client-error.js,test/js/bun/http/serve-http2-protocol.test.ts(unknown:method),test/js/bun/http/bun-serve-routes.test.ts.Background
Methodenum has 36 of them.Downsides
HttpMethod.htoo. The ids after it change in three files: that one,Method.rsandBunCommonStrings.cpp.Notes
"/*"for every method), node:http: keep the method of a dispatched request as sent in 'clientError' rawPacket #45398 (node:httprawPacket), and two drafts: server: read the method id uWS resolved, not the method name #45399 (Rust reads the method id) and uws: key HttpRouter by method id #45400 (HttpRouterkeyed by the id).isKnownMethodtoUtilities.hand conflicts with this PR in that function. The PR that lands second adapts: the body ofisKnownMethodbecomesmethodIdFromWire(method) != HTTP_METHOD_NONE, and the declaration ofBun__HTTPMethod__fromgoes.fetch: 2435, 2406. POST tofetch: 2750, 2712. PUT tofetch: 2635, 2606. PROPFIND tofetch: 2751, 2673. UNSUBSCRIBE tofetch: 2861, 2753. GET to a GET route: 2904, 2869. POST to a POST route: 3219, 3174. PUT to a PUT route: 3104, 3069. A standalone driver runs the realHttpParser.handHttpRouter.h(clang -O3) underqemu-x86_64 -one-insn-per-tb -d exec,nochain. Repeat runs differ by at most 4 instructions in 2.6 million. The drop is the second pass over the method bytes. In the strict parser (node:http) the inline switch takes the place of the FFI call: an earlier run of the driver with the Rust function linked in measured GET 2463 -> 2454 and POST 2802 -> 2790.perfis not available in the build container (perf_event_paranoidis 4), andvalgrindis not installed.HttpRequest,Http3Request,HttpRouter: no change (6472, 152, 3360 bytes).llvm-size): text 80,705,363 -> 80,703,571 bytes (main f4d755a, then this PR). data and bss do not change.Bun__HTTPMethod__fromwas 2,506 bytes.isValidMethodoutside strict mode returned true for every input it could get. The loop inconsumeRequestLinethat finds the end of the method already rejects an empty method and each byte that is not a letter or-.AtoZand-, and the HTTP/2 check made the same test first. So a lowercase name, whichBun__HTTPMethod__fromaccepted, never reached the lookup.static_assertinHttpMethod.hand the testdiscriminants_follow_wire_name_orderinMethod.rseach check the order and the count.BunCommonStrings.cpphas a third copy of the ids, forBun__HTTPMethod__toJS. Each of its enumerators is now checked at compile time against the name at that index ofHTTP_METHOD_NAMES.req.method.node-http,serve-http2-protocol,serve-http2,serve-http3,bun-serve-routes,request-smuggling, threetest-http-*-client-errorNode tests,cargo test -p bun_http_types.no test proof · iteration 0 · the description declares no behaviour change, so there is no failing test to prove; the existing suite in CI is the check