fix(core,transports): bound request decompression and harden realtime request handling (#7856) - #7880
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📝 SummarySummary by CodeRabbit
WalkthroughThe changes add bounded zstd decoding and decompressed-body limits, cache exported skills repositories and limit corpus-serving concurrency, and recover panics during remote SDP application. Server cleanup now closes the skills-serving handler. ChangesDecompression limits
Skills repository serving
WebRTC SDP handling
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Sequence Diagram(s)sequenceDiagram
participant Client
participant SkillsServingHandler
participant CorpusRequestGate
participant SkillsGitRepoCache
participant exportBareRepo
Client->>SkillsServingHandler: Request corpus Git endpoint
SkillsServingHandler->>CorpusRequestGate: Acquire request slot
SkillsServingHandler->>SkillsGitRepoCache: Acquire repository by key and version
SkillsGitRepoCache->>exportBareRepo: Build export on cache miss
exportBareRepo-->>SkillsGitRepoCache: Export directory
SkillsGitRepoCache-->>SkillsServingHandler: Cached repository
SkillsServingHandler-->>Client: Serve Git response
Suggested reviewers: Merge Risk: 🟡 Moderate · up to Public skills Git routes can be driven with varying Host headers to fill temp disk with cached exports. Sweep expired entries or cap the number of cache entries before merging. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Description checkExplanation The description contains only unedited template prompts and placeholder instructions. It does not explain the changes, select change types or affected areas, provide actual test steps, or address breaking changes and security considerations. Resolution Replace the placeholders with a concise summary of the PR, describe the changes and design decisions, select the applicable change types and affected areas, and provide actual validation steps and expected results. State whether the PR has breaking changes and describe any security considerations. Complete the applicable checklist items and add related issues or UI screenshots if relevant. Full details: Docstring CoverageExplanation Docstring coverage is 43.90% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 41 functions across 9 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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This was referenced Oct 3, 2026
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This was referenced Oct 3, 2026
akshaydeo
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October 3, 2026 04:29
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Review comments at @transports/bifrost-http/handlers/skills_serving.go:
- Around line 653-655: Update the cache acquisition path used by serveGitRepo to
evict every built entry whose age meets skillsGitRepoCacheTTL, rather than
expiring only the requested key. Preserve corpus-version invalidation and then
retrieve the requested entry from the remaining cache.
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⛔ Files ignored due to path filters (2)
tests/e2e/api/fixtures/zstd-window-512mib.zstis excluded by!**/*.zsttransports/go.sumis excluded by!**/*.sum
📒 Files selected for processing (11)
core/providers/utils/decompression.gocore/providers/utils/decompression_test.gotests/e2e/api/collections/provider-harness.jsontransports/bifrost-http/handlers/middlewares.gotransports/bifrost-http/handlers/middlewares_test.gotransports/bifrost-http/handlers/skills_serving.gotransports/bifrost-http/handlers/skills_serving_test.gotransports/bifrost-http/handlers/webrtc_realtime.gotransports/bifrost-http/handlers/webrtc_realtime_test.gotransports/bifrost-http/server/server.gotransports/go.mod
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… request handling (#7856) This PR hardens the gateway against three classes of request-level denial-of-service and process-termination vectors: a zstd frame header that declares a large back-reference window causing unbounded heap allocation before any output is produced, a malformed WebRTC SDP offer that panics inside the pion parser and terminates the process, and the absence of any panic recovery in the fasthttp handler chain meaning any panicking request kills every in-flight request with it. - **Zstd decoder memory bounds**: Added `ZstdDecoderMaxWindow` (8 MiB) and `ZstdDecoderMaxMemory` (1 GiB) constants and applied them to every decoder acquired from the pool. A frame declaring a larger window is refused before any allocation occurs. `IsDecompressionSizeLimitError` lets callers distinguish this from a malformed-body error and map it to 413 rather than 400. - **Decompression middleware size enforcement**: `RequestDecompressionMiddleware` now computes `maxRequestBodyBytes` before branching so both the streaming and buffered paths share the same cap. The streaming path wraps the decompressed reader in a `limitedBodyReader` that returns `errRequestBodyTooLarge` (rather than silently truncating like `io.LimitedReader`) once the cap is exceeded. Both paths check `IsDecompressionSizeLimitError` and return 413 with a message naming the exceeded bound. - **`limitedBodyReader`**: Replaces the `io.LimitedReader` + post-read length check pattern. Reading exactly the limit succeeds; the next byte fails with `errRequestBodyTooLarge`, so callers see an error rather than a silently truncated body. - **`RecoveryMiddleware`**: Added as the outermost middleware in the fasthttp handler chain. A panic escaping any handler is caught, logged with a stack trace, and converted to a 500 for that request. The process and all other in-flight requests continue. - **`setRemoteDescription` panic wrapper**: Wraps `pc.SetRemoteDescription` in a deferred recover so a panic raised by the pion SDP parser (e.g. an empty simulcast rid segment) surfaces as an error for the one request rather than terminating the process. - **Skills git repo cache (`skillsGitRepoCache`)**: Exported bare repositories are now cached per repository key and fingerprinted by the all-skills corpus version. Repeated fetches of an unchanged corpus reuse one export instead of rebuilding the object graph and a temp directory per request. A changed version evicts all entries; a dropped entry's directory is removed once no in-flight request is still reading from it. `SkillsServingHandler.Close` purges the cache on shutdown. - **Skills corpus concurrency gate**: `acquireSkillsCorpusServeSlot` limits corpus-serving requests (git smart HTTP and the all-skills zip download) to four concurrent operations. Requests beyond the cap receive 503 with `Retry-After: 1` immediately rather than queuing. - **pion dependency upgrades**: `pion/webrtc/v4`, `pion/rtcp`, and their transitive dependencies updated to current releases. - **E2E test collection**: Added three new cases covering the zstd oversized-window 413, the malformed SDP offer returning an HTTP status rather than a dropped connection, and a liveness probe confirming the gateway survives the malformed offer. - **Fixture file**: `tests/e2e/api/fixtures/zstd-window-512mib.zst` — the nine-byte zstd frame used by the E2E test. - [x] Bug fix - [x] Feature - [ ] Refactor - [ ] Documentation - [ ] Chore/CI - [x] Core (Go) - [x] Transports (HTTP) - [ ] Providers/Integrations - [ ] Plugins - [ ] UI (React) - [ ] Docs ```sh cd core go test ./providers/utils/... -run TestAcquireZstdDecoder cd transports go test ./bifrost-http/handlers/... -run 'TestRequestDecompressionMiddleware|TestLimitedBodyReader|TestRecoveryMiddleware' go test ./bifrost-http/handlers/... -run TestSetRemoteDescription go test ./bifrost-http/handlers/... -run 'TestSkillsServing|TestSkillsGitRepoCache' go test ./... ``` Send a POST to `/v1/chat/completions` with `Content-Encoding: zstd` and the nine-byte fixture body (`tests/e2e/api/fixtures/zstd-window-512mib.zst`); expect HTTP 413 with a body containing `window size exceeded`. Confirm process memory does not spike. - [ ] Yes - [x] No - A nine-byte zstd body could previously cause the decoder to reserve up to 512 MiB (or more with a crafted frame) of heap per request before producing any output. The new window and memory caps prevent this class of amplification attack. - The `limitedBodyReader` change closes a silent-truncation gap: previously a body that hit the `io.LimitedReader` cap appeared to succeed with a truncated payload; now it fails loudly, preventing a request from being processed with incomplete data. - The `RecoveryMiddleware` and `setRemoteDescription` wrapper prevent a single malformed request from terminating the process and all in-flight connections. - [x] I read `docs/contributing/README.md` and followed the guidelines - [x] I added/updated tests where appropriate - [ ] I updated documentation where needed - [x] I verified builds succeed (Go and UI) - [x] I verified the CI pipeline passes locally if applicable
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Summary
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docs/contributing/README.mdand followed the guidelines