feat(embed)!: scoped guards, TLS listener, gRPC-Web translation and capability builder - #122
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- Every guard (maintenance, rate limits, JWT, ext_authz, the auth
decider) takes a scope: the traffic it covers (transcoded, endpoints,
grpc, fallback, all), optionally narrowed by path globs and methods.
Guards are mounted per traffic class, so a request runs only the
guards of its own class; native gRPC and the fallback can now be
guarded too. Defaults keep the previous coverage.
- New concurrency limit guard (`concurrency.max_in_flight`): excess
requests get 503 UNAVAILABLE with Retry-After at once; a request
holds its slot until its response body ends.
- All guards reject through one path: a REST client gets the
google.rpc.Status JSON body with the mapped HTTP status, a gRPC or
gRPC-Web client a trailers-only status with the same code and the
guard's headers as metadata.
- `ProxyServer::with_auth_decider_scope` chooses the decider's traffic.
- A scope with no traffic, an invalid glob or method fails the build.
BREAKING CHANGE: guard rejections use the google.rpc.Status body
({"error","code","message","details"}) instead of {"error","message"};
maintenance answers that JSON body instead of plain text; an unmatched
path under maintenance is 404, since the fallback class is outside the
default scope.
Closes #120
The release packages ship static musl binaries, which were built only when a release was cut: a dependency that breaks the target would pass CI and fail the release. Build the packaged binary and run the tests on x86_64 and aarch64 musl in CI.
- `serve_with(listener, service, ServeOptions)`: TLS termination with any rustls config (ALPN h2 + http/1.1 filled in), the handshake in each connection's task under a 10 s limit, and `max_connections`, which waits for a free slot before accepting, so excess clients wait in the listen backlog. `serve` is `serve_with` with no options. - `listen.tls` (cert_file, key_file, client_ca_file, client_auth) and `listen.max_connections` configure `ProxyServer::serve`; `ProxyServer::serve_options` hands the same to an embedder's listener. A verified client certificate reaches an in-process tonic upstream as `Request::peer_certs`. - Connections run on hyper-util instead of `axum::serve`; axum no longer needs its `http2` feature. - README: TLS and connection limits; the TLS crypto section covers the listener too. BREAKING CHANGE: `ListenConfig` gains `max_connections` and `tls` and rejects unknown keys; `structured_proxy::service::serve` moves to `structured_proxy::serve`. Part of #118
Group the feature list by purpose, rewrite the densest paragraphs (rate limiting, error details, header forwarding, raw bodies, pass-through) as short sentences and lists, replace the transcoding-only architecture diagram with the request flow of the edge, and fix the stale crate version in the injected-verifier example.
- `grpc_web.translate: true` converts gRPC-Web calls (binary and text, HTTP/1.1 too) to gRPC through tonic-web, for an upstream without a gRPC-Web layer; CORS and the guards stay around it. - The translated call goes out as HTTP/2 and without a size hint: tonic-web reports the base64 length of a text body for the decoded bytes, which a remote HTTP/2 upstream refused as a protocol error (covered by the remote text translation test). - Translation without the proxy's gRPC-Web CORS is a config error: an upstream that speaks only gRPC cannot answer the browser's preflight. - gRPC paths that need guards or translation are built as boxed stacks per protocol; the others still pass through with nothing in between. Part of #118
- `ProxyServer::new()` starts with every capability off: native gRPC goes to the upstream, everything else to the fallback. One builder method per config section (`with_listen`, `with_health`, `with_metrics`, `with_openapi`, `with_cors`, `with_maintenance`, `with_concurrency_limit`, `with_rate_limits`, `with_auth`, ...) sets the same field the YAML does, so code and file describe one proxy. - `config::from_yaml` reads a single section, for the sections that are built through serde. - `transcode.only` / `with_transcoded_rpcs` narrows transcoding to named services and methods; routes, the collision check and the OpenAPI spec follow the same selection, and a name the descriptors do not hold fails the build. - `ProxyConfig` implements `Default` (the empty file). BREAKING CHANGE: `transcode::route_paths` and `openapi::generate` take the RPC selection; `ProxyConfig` gains the `transcode` field. Closes #118
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📝 SummarySummary by CodeRabbit
WalkthroughThe proxy adds selectable RPC transcoding, scoped guards, request concurrency limits, and optional gRPC-Web translation. It adds TCP serving with TLS, connection limits, and timeouts. Guard rejections now include protocol-aware gRPC status information. ChangesComposable proxy edge
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant Client
participant ProxyService
participant Guards
participant Upstream
Client->>ProxyService: Send gRPC or gRPC-Web request
ProxyService->>Guards: Apply guards for the request traffic class
Guards->>Upstream: Forward request when allowed
Upstream-->>ProxyService: Return protocol response
ProxyService-->>Client: Return response or protocol-mapped rejection
Merge Risk: 🔵 Low · up to Clarify that stalled handshakes can delay later clients when the configured connection limit is full. This documentation correction does not block merging. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to Opt-in gRPC-Web translation can make additional upstream RPCs reachable, while existing authentication settings do not automatically cover those calls. The impact depends on the upstream’s own authorization policy. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 79.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 246 functions across 33 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
Review comments at @src/config.rs:
- Around line 495-498: Change the `client_auth` field in the TLS configuration
to `Option<ClientAuth>` so omitted and explicitly configured values are
distinguishable. In `server_config`, reject any set `client_auth` when
`client_ca_file` is absent; when a CA is configured, use `Required` as the
effective default if `client_auth` is omitted.
Review comments at @src/guard.rs:
- Around line 182-196: Update the method validation in the `scope.methods`
mapping that uses `Method::from_bytes` to reject non-standard method names while
preserving the existing error message for invalid entries. Handle `*` separately
with an error directing operators to leave `methods` empty to cover every
method; preserve support for extension methods if they are declared by the
transcoded bindings.
Review comments at @src/lib.rs:
- Around line 961-970: Update the default scope passed to `scope` in the
concurrency guard setup to include only `Transcoded` and `Grpc`, leaving
explicitly configured scopes available. Update the concurrency scope
documentation in `src/config.rs` and `README.md` to match.
Review comments at @src/serve.rs:
- Around line 193-204: Add a real idle-connection policy to serve_connection so
responsive HTTP/2 clients with no active streams cannot hold slots in serve_with
indefinitely; configure or implement idle eviction, rather than relying only on
PING keep-alives, which detect unresponsive peers. Preserve active connections
and their upgrades while applying the idle policy.
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⛔ Files ignored due to path filters (3)
src/tls/testdata/client-ca.pemis excluded by!**/*.pemsrc/tls/testdata/client.key.pemis excluded by!**/*.pemsrc/tls/testdata/client.pemis excluded by!**/*.pem
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.github/workflows/ci.ymlCargo.tomlREADME.mdsrc/auth/authz.rssrc/auth/forward/tests.rssrc/auth/mod.rssrc/auth/tests.rssrc/config.rssrc/config/tests.rssrc/embed.rssrc/guard.rssrc/guard/concurrency.rssrc/guard/grpc.rssrc/guard/tests.rssrc/lib.rssrc/openapi.rssrc/openapi/tests.rssrc/serve.rssrc/serve/tests.rssrc/service.rssrc/service/tests.rssrc/shield/mod.rssrc/shield/tests.rssrc/tests.rssrc/tls.rssrc/tls/testdata/generate.shsrc/transcode/error.rssrc/transcode/mod.rssrc/transcode/select.rssrc/transcode/tests.rssrc/upstream.rstests/edge.rstests/embedded.rstests/tls.rs
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- An HTTP/2 connection with no stream open held its max_connections slot forever. A connection with no request in flight for listen.idle_timeout_secs (default 60, 0 = never) is now shut down gracefully (GOAWAY on HTTP/2); a request counts until its response body ends, so streams keep their connection. - hyper drops its default HTTP/1.1 header read timeout without a timer, so a client trickling headers held its connection forever. The connection now runs with a timer and listen.header_read_timeout_secs (default 30); the TLS handshake timeout is listen.tls. handshake_timeout_secs (default 10). ServeOptions exposes all three. - listen.tls.client_auth without client_ca_file gave a listener that verified no client; it is now an error, and a CA alone means required. - A scope method of "*" or one no route answers (a typo) matched no request and left the guard covering nothing; both fail the build, while methods of custom rules and extra routes, and any method for fallback traffic, stay allowed. - The concurrency limit no longer covers the proxy's own endpoints by default: a saturated proxy refused its health probes, getting busy instances restarted. - The response-body wrappers of the concurrency guard and the idle tracking share one type. Regression tests: an_idle_http2_connection_gives_up_its_slot, a_client_that_trickles_its_headers_is_disconnected, client_auth_without_a_client_ca_is_an_error, a_catch_all_method_is_an_error, a_method_no_route_answers_is_an_error, a_saturated_proxy_still_answers_its_health_probes.
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Inline comments:
Review comments at @README.md:
- Around line 841-843: Qualify the README’s claim about TLS handshake isolation:
explain that per-connection tasks keep handshakes from blocking the accept loop,
but stalled handshakes hold reserved max_connections slots and can make later
clients wait in the listen backlog until a handshake completes or times out.
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- A guard narrowed by path or method called the service it did not guard without polling it first, so a fallback that needs poll_ready (a concurrency limit) panicked. The chosen branch is now called as a oneshot on its own clone, as axum's Route does. - An HTTP upgrade (a WebSocket in a fallback) hands the socket out of hyper and ends the connection future, which dropped the max_connections slot while the socket stayed open. The slot now lives with the connection's IO and is released when the socket closes. - README: the connection slot, the three timeouts and upgrades, stated precisely. Regression tests: a_narrowed_guard_readies_the_branch_it_calls, an_upgraded_connection_keeps_its_slot_until_it_closes.
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Summary
Changes
scope: traffic classes (transcoded,endpoints,grpc,fallback,all) narrowed by path globs and methods; defaults keep the previous coverage. Native gRPC and the fallback can now be guarded.concurrency.max_in_flightguard (default scopetranscoded,grpc): excess requests get 503 UNAVAILABLE at once; a stream holds its slot until its body ends.google.rpc.StatusJSON for REST, trailers-only status with the guard's headers as metadata for gRPC and gRPC-Web.listen.tls(mTLS withclient_ca_file),listen.max_connections, and connection timeouts: idle connections are closed afteridle_timeout_secs(GOAWAY on HTTP/2), HTTP/1.1 headers must arrive withinheader_read_timeout_secs, the TLS handshake withintls.handshake_timeout_secs.serve_with/ServeOptions/ProxyServer::serve_optionsfor an embedder's own listener. Connections run on hyper-util.grpc_web.translateconverts gRPC-Web to gRPC for an upstream without a gRPC-Web layer (needscors.grpc_web).ProxyServer::new()with one builder method per config section,config::from_yamlfor single sections, andtranscode.only/with_transcoded_rpcsto transcode chosen services and methods (routes, collision check and OpenAPI follow it; unknown names fail the build).x86_64andaarch64musl.Testing
fmt, clippy (
-D warnings, with all features and without a crypto backend), the full nextest suite, doc tests andcargo docpass on macOS; the musl job runs Linux here.BREAKING CHANGE: guard rejections use the
google.rpc.Statusbody and maintenance answers JSON;servemoved to the crate root and runs on hyper-util;ListenConfigrejects unknown keys and gains the connection timeouts;transcode::route_pathsandopenapi::generatetake the RPC selection;ProxyConfiggainsconcurrency,grpc_webandtranscode.Closes #120
Closes #118