fix(http): stop buffering whole bodies on the range-GET header fallback - #905
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GatewaysRootTxIndex and ChunkMetadataAnchorSource fall back to a `Range: bytes=0-0` GET when a peer's HEAD is unusable, and only need that response's headers. Both fetched the body with `responseType: 'arraybuffer'` and axios's default `maxContentLength` of -1, so a peer that ignores the range and answers 200 had its whole response buffered in memory, bounded only by the request timeout. Measured locally: a 300 MiB body was fully buffered. Receive the body as a stream and hand it to a new `discardResponseBody` helper, which: - reads a body of up to 64 KiB to the end, so a keep-alive socket is reused exactly as it was after a buffered read (closing every stream would force a new connection per fallback); - destroys a larger body, a body still arriving after the request timeout, or a failing stream, closing the connection instead of downloading it; - never rejects, and leaves an error listener so a late stream error can't go unhandled. GatewaysRootTxIndex also discards the body of an error response, which its axios instance rejects with the stream still unread. ChunkMetadataAnchorSource re-checks its abort signal after discarding, because a buffered read used to reject when aborted mid-body. Tests run both callers against a real HTTP server with the real axios instances: a peer that ignores the range, including an error status, is no longer read in full, and a peer that honours it keeps a single keep-alive connection across lookups. Restoring the buffered read fails the first group; destroying every body fails the second. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EExbqiSKPLAtqxPLkdGqK3
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📝 WalkthroughWalkthroughThe change adds bounded streamed-response disposal and applies it to range-GET fallbacks in chunk metadata and gateway root lookups. Tests cover large-body termination, failed responses, abort handling, and keep-alive connection reuse. ChangesStreamed range-GET fallback
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant Lookup
participant PeerHTTPServer
participant discardResponseBody
Lookup->>PeerHTTPServer: send HEAD request
PeerHTTPServer-->>Lookup: reject or fail HEAD
Lookup->>PeerHTTPServer: send streamed range GET
PeerHTTPServer-->>Lookup: return response headers and body stream
Lookup->>discardResponseBody: dispose response body
discardResponseBody-->>Lookup: complete cleanup or destroy stream
Merge Risk: 🟡 Moderate · up to A narrowly timed failed response stream can terminate the process instead of being safely discarded. Attach the listener before the destroyed-state check before merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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🧪 Generate unit tests (beta)
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In `@src/lib/http-utils.ts`:
- Line 388: Update discardResponseBody to install its persistent error listener
before checking body.destroyed or body.readableEnded, while preserving the
existing non-Readable guard and cleanup behavior. Add a regression test that
destroys the stream with an error before invoking discardResponseBody and
verifies the error is handled.
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src/data/chunk-metadata-anchor-source.test.tssrc/data/chunk-metadata-anchor-source.tssrc/discovery/gateways-root-tx-index.test.tssrc/discovery/gateways-root-tx-index.tssrc/lib/http-utils.test.tssrc/lib/http-utils.ts
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Additional details and impacted files@@ Coverage Diff @@
## develop #905 +/- ##
===========================================
+ Coverage 82.12% 82.17% +0.04%
===========================================
Files 149 149
Lines 61813 61914 +101
Branches 4955 4970 +15
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+ Hits 50766 50876 +110
+ Misses 10981 10972 -9
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`Readable.destroy(error)` marks a stream destroyed immediately but emits its 'error' event on a later tick. discardResponseBody returned early for a destroyed stream before attaching its error listener, so a body destroyed with an error just before the call raised an uncaught exception. Reproduced: `destroy(new Error(...))` followed by discardResponseBody crashed with that error. Attach the listener first, then return for a destroyed or ended stream. The new regression test fails without the reordering. Reported by CodeRabbit on #905. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EExbqiSKPLAtqxPLkdGqK3
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Problem
When a peer's HEAD is unusable,
GatewaysRootTxIndexandChunkMetadataAnchorSourcefall back to aRange: bytes=0-0GET, and only use that response's headers. Both requests usedresponseType: 'arraybuffer'with axios's defaultmaxContentLength: -1.A peer that ignores the range and answers
200therefore had its whole response buffered, limited only by the request timeout (10 s and 5 s). Measured locally: a 300 MiB body was buffered in full.Both callers only talk to operator-configured trusted gateways, so this needs a misbehaving gateway, or a CDN in front of one. It's a bounded risk, not an outage.
Fix
Both requests now receive the body as a stream and pass it to a new helper,
discardResponseBodyinsrc/lib/http-utils.ts:Kept identical on purpose:
GatewaysRootTxIndexalso discards the body of an error response. Its axios instance rejects on non-2xx and would otherwise leave that stream unread.ChunkMetadataAnchorSourcere-checks its abort signal after discarding. The buffered read used to reject when aborted mid-body.Tests
New tests run both callers against a real HTTP server with the real axios instances, not mocks:
500error body (root TX index)The first two columns come from mutation runs against the same tests.
discardResponseBodyalso has unit tests covering: a small body read to the end, a large body destroyed, a body that never ends, a failing stream, non-stream input, and an already-ended stream.Verification
http-utils72/72,gateways-root-tx-index22/22,chunk-metadata-anchor-source19/19. All pre-existing tests are unchanged and pass.yarn testran 2530 tests: 2525 passed, 4 skipped, and 1 failed. The failure isparquet-exporter, which needs GLIBC 2.32 and fails identically ondevelopon this host.yarn buildandyarn lint:checkpass.yarn typecheckreports 433 errors, the same asdevelop, with none in the changed files.🤖 Generated with Claude Code