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📋 Pull Request Information
Original PR: https://github.com/morluto/rea/pull/6299
Author: @morluto
Created: 10/22/2026
Status: ✅ Merged
Merged: 10/22/2026
Merged by: @morluto
Base:
main← Head:cursor/capture-decoder-heap-d806📝 Commits (3)
6bb21c6feat(captures): make the HAR/SAZ/qlog decoder heap configurable0353b89fix(captures): defer decoder startup and share one parsed heap89e913cmerge(main): keep capture decoder and regex worker heap settings📊 Changes
21 files changed (+634 additions, -56 deletions)
View changed files
📝
.agents/skills/reverse-engineer-anything/SKILL.md(+4 -1)📝
docs/web-network-captures.md(+20 -8)📝
src/application/Doctor.test.ts(+1 -0)📝
src/application/SetupRegistrationEnvironment.ts(+1 -0)📝
src/browser/history/CaptureFailures.test.ts(+10 -3)📝
src/browser/history/CaptureFailures.ts(+23 -9)📝
src/browser/history/CaptureRelease.ts(+20 -5)📝
src/browser/history/HistoricalCaptureDecoder.ts(+77 -12)📝
src/browser/history/HistoricalCaptureFormatAdapter.ts(+6 -0)📝
src/browser/history/NodeCaptureAdapter.test.ts(+1 -1)📝
src/browser/history/NodeCaptureAdapter.ts(+30 -9)📝
src/cli/webNetworkCaptureCommands.ts(+1 -1)📝
src/composition/webNetworkCaptures.ts(+8 -5)➕
src/config/captureDecoderHeap.test.ts(+260 -0)➕
src/config/captureDecoderHeap.ts(+105 -0)📝
src/config/environment.ts(+3 -0)📝
src/setupEnvironment.test.ts(+2 -0)📝
tests/acceptance/setup/registrationRuntimeEnvironmentCli.test.ts(+5 -0)📝
tests/acceptance/tools/historicalCaptureResources.test.ts(+24 -2)➕
tests/boundary/cli/captureDecoderHeapDoctor.test.ts(+28 -0)...and 1 more files
📄 Description
Summary
Part of #6176.
HAR, SAZ, and qlog decoding used a fixed 192 MiB Node old-generation heap and told operators that inherited
NODE_OPTIONScould not raise it.REA_CAPTURE_DECODER_OLD_GENERATION_MIBkeeps that 192 MiB default and lets the process that starts REA choose another value inside a documented floor and maximum.Problem and expected behavior
Operators with large captures could not raise the owned decoder heap. Host memory and
NODE_OPTIONSdo not, because the decoder passes--max-old-space-sizeitself and removes inheritedNODE_OPTIONS.Unset behavior stays 192 MiB. A value from 8 to 16384 MiB is the effective old generation. Any other value fails configuration and names
REA_CAPTURE_DECODER_OLD_GENERATION_MIB. It does not fall back to 192. Doctor reports that failure asruntime-configuration:REA_CAPTURE_DECODER_OLD_GENERATION_MIBand still prints its JSON report.rea doctorand help do not construct the capture service. The inspect command and MCP server composition do, and they refuse an invalid value. Setup copies a caller-selected value throughSELECTED_REGISTRATION_SETTINGS.Recovery, capability, and limitation text name the setting, the effective mebibytes, the source (
defaultorsetting), the default, the floor, the maximum, and how to change it. That text uses the heap the selected Node adapter launches. The 8 MiB semi-space stays fixed. The 32 MiB input, 96 MiB reply, and 64-level nesting budgets stay fixed.Change and scope
src/config/captureDecoderHeap.tsis the only parser. Startup (parseEnvironment/parseConfig), doctor, and setup registration use that schema.createWebNetworkCaptureServiceresolves the environment once and passes that parsed heap to eachNodeCaptureAdapter.HistoricalCaptureDecoderreuses an agreeing adapter heap and reports the selected adapter's heap. The adapter passes the effective value as--max-old-space-size. On Windows under Bun, the Job Object commit limit follows that value plus the existing 512 MiB reserve.CLI registration builds the capture service only when
inspect-web-network-captureruns. MCP server composition still builds it at startup.The floor is 8 MiB because the decoder also passes
--max-semi-space-size=8, and a smaller old generation aborts Node during isolate startup instead of enforcing a limit. The maximum is 16384 MiB, the same ceiling REA already uses for one isolated JavaScript analysis worker. Node will start with a larger flag; this maximum is REA's refusal.This branch now includes
mainthrough #6301.REA_REGEX_WORKER_HEAP_REQUEST_MIBstays main's setting. Both settings remain inSELECTED_REGISTRATION_SETTINGS, the environment schema, and the shared doctor, setup, and client-configuration tests.Follow the contribution scope.
This is configuration of an existing offline decoder admission. It does not add a provider or a capability that executes, injects, mutates, or recovers a target. Maintainer scope decision: not applicable. The product decision to make this ceiling a setting is recorded in #6176.
Contract and boundary impact
captureDecoderHeap.tsparses the setting.createWebNetworkCaptureServiceresolves it once.NodeCaptureAdapterstores that fact and applies it when the decoder process is launched. Reports read the selected adapter's fact.old_generation_heap_source. Capture identity and the original file are unchanged.docs/public/product-catalog.json), package, or installation impact (CI generates and validates ignored catalogs andskills/; edit authored instructions in.agents/skills/reverse-engineer-anything/and never commit build outputs): skill guidance names the setting. No package or catalog source change.Expected effects (check known effects; use documentation-only on its own).
Unchecked items do not establish absence; leave uncertainties visible.
Evidence and regression coverage
src/config/captureDecoderHeap.test.tslocks the default, a 256 MiB override, the command line, invalid values at startup,parseConfig, adapter construction, and service composition. It also locks a parsed heap passed through without re-reading a conflicting environment, and a decoder whose HAR adapter is 256 MiB and whose SAZ adapter is 512 MiB while the decoder environment is empty: limitations and the exhaustion report say 256 MiB, source setting.tests/boundary/cli/captureDecoderHeapDoctor.test.tsruns compileddoctor --jsonwith the setting7. Doctor, setup registration, and client-configuration tests cover the same invalid and selected values, and after the main merge they also keep the regex worker heap cases.tests/acceptance/tools/historicalCaptureResources.test.tscovers a real HAR exhaustion and a successful small capture.NodeCaptureAdapter.test.tsmockscaptureDecoderProcessMemoryLimitBytesto return null.NODE_OPTIONScould not raise it. CLI registration also threw on an invalid value before doctor could report it. The new tests fail if the setting is ignored, an invalid value falls back to 192, doctor fails before printing JSON, or a report uses a heap other than the one the selected adapter launches.resource_constraintwith messageThe har decoder exhausted its 192 MiB V8 old-generation heap (source default)and remediation beginningThe effective REA_CAPTURE_DECODER_OLD_GENERATION_MIB value is 192 MiB (source default; default 192 MiB, floor 8 MiB, maximum 16384 MiB). Set REA_CAPTURE_DECODER_OLD_GENERATION_MIB in the environment that starts REA to a decimal integer from 8 to 16384, then restart REA.The successful two-record capture limitations contain that same sentence. CLI--jsonfor the exhaustion contains the setting name andsource default.doctor --jsonwith the setting7exits 1, writes no stderr, and includesruntime-configuration:REA_CAPTURE_DECODER_OLD_GENERATION_MIBwithclassificationconfig_drift.javaScriptWorkerMemoryLimitByteshelper applied to the resolved mebibytes. A heap above 192 MiB was checked on the command line and in projected failures, not by exhausting a 256 MiB decoder. The unavailable-bound refusal is covered by mocking the helper, not by running Bun on Windows.For evidence-bearing changes:
Validation performed
On merge commit
89e913c30(mainparent9512a8080, previous PR head0353b89ae):npm run check:fast— passed (typecheck and lint, 2 tasks successful).npm run format:check— passed.npm run test:local -- src/config/captureDecoderHeap.test.ts src/browser/history/CaptureFailures.test.ts src/browser/history/NodeCaptureAdapter.test.ts src/application/Doctor.test.ts src/setupEnvironment.test.ts— passed, 104 tests.npm run test:focused -- tests/boundary/cli/captureDecoderHeapDoctor.test.ts tests/boundary/browser/historicalCaptureDecoder.test.ts tests/acceptance/tools/historicalCaptureResources.test.ts tests/boundary/filesystem/clientConfigurationEnvironment.test.ts tests/acceptance/setup/registrationRuntimeEnvironmentCli.test.ts— passed, 71 tests with 11 skipped (24 decoder boundary, 1 CLI doctor, 1 HAR acceptance, 40 client-configuration with 10 skipped, 16 registration with 1 skipped).doctor --jsonran on Node.js v22.23.4 on Linux.Compatibility, safety, and release
NODE_OPTIONSbefore launch.Author readiness
Human owner: @morluto
Before merge
type(scope): outcome.🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.