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fix(backend): add structure-aware chat admission (#8296)

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Co-authored-by: Ravi Tharuma <RaviTharuma@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>
This commit is contained in:
Ravi Tharuma
2026-07-23 16:59:20 +02:00
committed by GitHub
parent 14468cdec5
commit 08a21bcf27
5 changed files with 309 additions and 2 deletions
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docs/reference/ENVIRONMENT.md
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@@ -188,6 +188,10 @@ OmniRoute uses **SQLite** (via `better-sqlite3`) for all persistence. These vari
| `OMNIROUTE_CHAT_LARGE_BODY_BYTES` | `262144` (256 KB) | `src/shared/middleware/chatBodyAdmission.ts` | Actual request bodies at or above this threshold require an atomic process-local heavyweight admission lease before JSON parsing. |
| `OMNIROUTE_CHAT_HARD_MAX_BODY_BYTES` | `52428800` (50 MB) | `src/shared/middleware/chatBodyAdmission.ts` | Chat-route hard cap enforced against bytes read during bounded ingestion, including requests with missing, invalid, or dishonest `Content-Length`; excess receives `413`. |
| `OMNIROUTE_CHAT_MAX_HEAVY_IN_FLIGHT` | `1` | `src/shared/middleware/chatBodyAdmission.ts` | Maximum heavyweight chat requests admitted concurrently in one process. When capacity is unavailable, OmniRoute returns retryable `503` with `Retry-After`. |
| `OMNIROUTE_CHAT_HEAVY_MESSAGE_COUNT` | `200` | `src/shared/middleware/chatBodyAdmission.ts` | Message count that classifies a chat request as heavyweight even when its body is below the byte threshold. |
| `OMNIROUTE_CHAT_HEAVY_TOOL_COUNT` | `64` | `src/shared/middleware/chatBodyAdmission.ts` | Tool count that classifies a chat request as heavyweight even when its body is below the byte threshold. |
| `OMNIROUTE_CHAT_HEAVY_ESTIMATED_TOKENS` | `32000` | `src/shared/middleware/chatBodyAdmission.ts` | Conservative string-size token estimate that classifies a request as heavyweight; this is an admission-cost proxy, not provider billing tokenization. |
| `OMNIROUTE_CHAT_HARD_MAX_MESSAGES` | `800` | `src/shared/middleware/chatBodyAdmission.ts` | Hard chat history cap. Requests above it receive structured compact-required `413` before compression, translation, or provider dispatch. |
| `OMNIROUTE_MAX_NONSTREAMING_RESPONSE_BYTES` | `67108864` (64 MB) | `open-sse/handlers/chatCore/nonStreamingResponseBody.ts` | Hard cap for a non-streaming upstream response buffered fully into memory. Past this the upstream reader is cancelled and the request fails fast instead of growing an unbounded string until the heap is exhausted. |
| `CORS_ORIGIN` | _(unset)_ | `src/server/cors/origins.ts` | Legacy single-origin CORS allowlist. Prefer `CORS_ALLOWED_ORIGINS` for new deployments. CORS is only for cross-origin browser API clients; authenticated dashboard writes use same-origin requests plus session-bound CSRF protection instead. |
| `CORS_ALLOWED_ORIGINS` | _(unset)_ | `src/server/cors/origins.ts` | Comma-separated CORS allowlist. No wildcard is sent unless `CORS_ALLOW_ALL=true` is explicitly configured. |