feat: discord proxy - #353
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📝 WalkthroughWalkthroughThe pull request adds an optional Discord REST proxy service, integrates bot and API clients with proxy configuration, adds Docker Compose orchestration and health checks, and documents the architecture and rollout behavior. ChangesDiscord REST proxy
Estimated code review effort: 4 (Complex) | ~45 minutes Mergeability Score: 🟡 Moderate · up to The proxy can leave clients hanging on empty or error responses, while invalid configuration may prevent startup or route requests incorrectly. These bounded correctness and availability issues should be fixed before merging. Sequence Diagram(s)sequenceDiagram
participant API_or_Bot
participant DiscordProxy
participant DiscordREST
API_or_Bot->>DiscordProxy: Send proxied Discord request
DiscordProxy->>DiscordREST: Resolve REST instance and forward request
DiscordREST-->>DiscordProxy: Return response or rate-limit error
DiscordProxy-->>API_or_Bot: Return filtered response
Possibly related PRs
🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (1 warning, 1 inconclusive)
✅ Passed checks (3 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 3
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Inline comments:
In `@packages/private/backend-core/src/lib/env.ts`:
- Line 78: Update the DISCORD_PROXY_PORT schema in the environment validation to
require an integer between 1 and 65535 inclusive after coercion. Add tests
covering both valid boundary values and invalid values outside the range or
non-integers.
- Around line 79-80: Update the optionalHttpUrl validation used by
DISCORD_PROXY_URL_DEV and DISCORD_PROXY_URL_PROD to accept only URLs whose
pathname is exactly /api and that contain neither a query nor a fragment; reject
missing, arbitrary, trailing-slash, query, and fragment variants, and add tests
covering each rejected case.
In `@services/discord-proxy/src/lib/responses.ts`:
- Around line 36-94: Ensure every response path ends the HTTP response: update
respond for bodyless success responses and update populateGeneralErrorResponse,
populateRateLimitResponse, and populateAbortErrorResponse to call res.end()
after writing headers or error data. Add coverage for a bodyless successful
response and each handled error path.
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Fix all unresolved CodeRabbit comments on this PR:
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📒 Files selected for processing (27)
.env.publicDockerfiledocker-compose.ymldocs/roadmap/01-architecture.mddocs/roadmap/11-automoderator-port.mdpackage.jsonpackages/private/backend-core/src/index.tspackages/private/backend-core/src/lib/__tests__/env.test.tspackages/private/backend-core/src/lib/context.tspackages/private/backend-core/src/lib/discordRest.tspackages/private/backend-core/src/lib/env.tspackages/private/bot-core/src/lib/__tests__/testEnv.tspackages/private/bot-core/src/lib/rest.tsservices/api/src/__tests__/stubEnv.tsservices/api/src/util/discordAPI.tsservices/discord-proxy/package.jsonservices/discord-proxy/src/bin.tsservices/discord-proxy/src/index.tsservices/discord-proxy/src/lib/__tests__/http.test.tsservices/discord-proxy/src/lib/__tests__/responses.test.tsservices/discord-proxy/src/lib/__tests__/rests.test.tsservices/discord-proxy/src/lib/http.tsservices/discord-proxy/src/lib/responses.tsservices/discord-proxy/src/lib/rests.tsservices/discord-proxy/tsconfig.eslint.jsonservices/discord-proxy/tsconfig.jsonservices/discord-proxy/vitest.config.ts
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Claude finished @didinele's task in 3m 1s —— View job Review: feat: discord proxyRead through the new On the outstanding CodeRabbit threadsAll three are already correctly addressed, so no action needed:
Inline notes (both non-blocking)
Things I specifically checked and liked
VerificationI reviewed statically only — I did not run Reviewed the branch as-is; no merge-base was available in this shallow checkout, so this reflects the files on |
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| * Clients talk to us with the same absolute paths they'd send Discord (`/api/v10/guilds/:id`), but `REST` | ||
| * wants the version-less route (`/guilds/:id`) and re-adds `/api/v{version}` itself from its own options. | ||
| */ | ||
| const API_PREFIX = /^\/api(?:\/v\d+)?/; |
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Minor robustness: API_PREFIX isn't anchored to a path segment boundary, so it strips on any path starting with the literal /api, not just the /api segment. e.g. parseFullRoute('/apifoo/bar') → /foo/bar, and parseFullRoute('/api-docs') → /-docs.
In practice clients always send well-formed /api/v10/... paths so this never fires today, but a trailing (?=/|$) would make the intent exact:
const API_PREFIX = /^\/api(?:\/v\d+)?(?=\/|$)/;Non-blocking — flagging since the existing tests only cover the happy prefix shapes.
| for (const [header, value] of data.headers) { | ||
| if (!shouldForwardResponseHeader(header)) { | ||
| continue; | ||
| } | ||
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| res.setHeader(header, value); | ||
| } |
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populateSuccessResponse forwards every upstream header except x-ratelimit*, then re-streams data.body itself. That means framing headers — content-length, content-encoding, transfer-encoding, connection — are copied verbatim onto a response body that Node is re-framing on its own.
Today this is safe: the request forwarded upstream drops accept-encoding (only content-type/authorization/x-audit-log-reason are forwarded), so Discord answers uncompressed with a content-length that matches the piped bytes, and @discordjs/proxy gets away with the same copy-all approach for the same reason. But it's an implicit dependency — if a future change ever forwards accept-encoding, or Discord answers transfer-encoding: chunked (undici hands you a de-chunked stream but the header still says chunked), the forwarded framing header would desync the response and the client would hang or truncate.
Not blocking given current behavior, but worth either a why comment pinning the dependency or an explicit deny-list for hop-by-hop/framing headers alongside the x-ratelimit strip.
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Claude finished @didinele's task in 3m 40s —— View job Review: feat: discord proxyRe-reviewed the branch after the two "review pass" commits ( This is a tight, well-scoped change with the repo's signature "why" comments (the rate-limit-accounting motivation is spelled out everywhere it matters). Nothing blocking — one non-blocking observation posted inline. Prior review items — all resolved ✅
Inline note (non-blocking)
Things I specifically checked and liked
VerificationStatic review only. Per CLAUDE.md I did not run Note: the shallow CI checkout has no merge-base with |
| * deliberately keeps its OAuth client pointed straight at Discord for this reason (see `discordAPI.ts`); | ||
| * this is the safety net for anything that slips through. | ||
| */ | ||
| const POOLED_KEY = ''; |
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Non-blocking, worth a thought: all token-less traffic — webhook execution and interaction callbacks — pools onto this single REST, and createProxyRest leaves globalRequestsPerSecond at its default 50 (unlike the client options in discordRest.ts, which set it to Infinity). So the pooled instance enforces one shared 50/s global allowance across every token-less caller, and with rejectOnRateLimit: () => true a request over that line is answered with an immediate 429 rather than being queued.
Discord's per-bot 50/s global limit doesn't actually apply to token-less routes, so this is conservative rather than wrong — but interaction callbacks are latency-critical (the 3s ack window) and would be the thing 429'd if aggregate token-less volume ever spikes. Volume is low today so it's unlikely to bite, but since the per-token isolation argument in this file is what makes the pooling safe for bot tokens, it may be worth a line noting that the pooled instance's global counter is deliberately shared (and that token-less routes aren't globally limited by Discord anyway).
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Claude finished @didinele's task in 2m 13s —— View job Review: feat: discord proxyRe-reviewed the branch after the latest Nothing blocking, and no new inline notes. The one open item from my prior pass is now closed, so this is a confirming review. The last open note is resolved ✅
Everything from the earlier passes stayed fixed
Things I checked this pass and am satisfied with
VerificationStatic review only. Per CLAUDE.md I did not run Note: the shallow CI checkout has no merge-base with |
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