refactor(code-index): extract scan execution and harden orchestration by WebMad · Pull Request #1821 · Zoo-Code-Org/Zoo-Code

WebMad · 2026-09-26T21:00:59Z

Summary

Refs #1819; part of #1592.

Extract full/incremental execution, shared progress/error accumulation and scan-result validation into CodeIndexScanExecutor.
Keep operation ownership, cancellation, cleanup policy, watcher management and final completion in the orchestrator.
Simplify startup guards and error handling; consolidate cancellation checks and telemetry; remove empty listeners, unused counters and stale comments.
Add focused executor coverage and expand orchestrator regression coverage. No new dependencies, settings or index-format changes.

Bugs fixed during this work / intentional behavior changes

These are explicitly agreed fixes, not silent semantic changes disguised as extraction:

Clearing an index now aborts and waits for active indexing before deleting data. A separate clearing guard prevents a new indexing run during deletion; watcher shutdown no longer releases the indexing-operation guard.
Cancellation during watcher initialization cannot finish as successful indexing. Cancellation during completion persistence restores the incomplete marker after the pending write completes.
Incremental batch failures now report Error without marking completion or clearing the existing collection/cache, including partial success. The full-scan policy (fatal above 10% failed blocks when batch errors exist) is unchanged.
Cache cleanup/flush errors no longer interrupt terminal error/cancellation handling or hide the original scan error.
A failure while checking existing collection contents no longer triggers destructive cleanup before a full scan is selected.
Watcher success is determined by the batch summary, including per-file errors, rather than processed-file counts. Trailing progress events do not overwrite the result.
Repeated indexing reuses an already-active watcher and subscriptions instead of registering duplicates.
Normal cancellation during watcher initialization is not reported as an error in telemetry.

Scope boundary / follow-up work

There is still useful work to do, but this is a sufficient stopping point for this iteration. This PR does not claim to resolve all indexing issues or every acceptance scenario in #1819, and deliberately does not auto-close the issue.

Restart after complete watcher disposal needs a separate lifecycle fix: the concrete watcher disposes its event emitters; active-watcher reuse here does not recreate disposed emitters.
Incremental failure handling preserves the collection rather than clearing it, but does not provide transactional rollback for changed-file points already deleted by the scanner.
Further review of in-flight watcher batches, concurrent scan/watcher work and retry/cache consistency remains outside this change.
Additional lifecycle/acceptance coverage and interface-only wiring can be handled in follow-up work coordinated with [ENHANCEMENT] Inject code-index factories through the workspace scope #1817.

Validation

Code-index suite: 673 tests passed across 27 files.
Focused orchestrator/executor tests passed.
Changed-file ESLint with suppression pruning passed; suppression counts decreased.
TypeScript no-emit check and diff whitespace check passed.
Commit/push hooks: repository lint and type checks passed.
Environment warning: local Node 24.7.0 differs from the repository's requested 22.23.1; CI validation is still required.

Coverage follow-up

Test-only commit 115f873 adds coverage for startup rejection, watcher startup failures, unexpected rejection values, cleanup failures, missing configuration, repeated clearing and missing scanner results. Local V8 coverage for both changed implementation files is 100% statements, branches, functions and lines. This is local evidence; the updated CI/Codecov report is pending.

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📝 Summary

Summary by CodeRabbit

Improvements
- Workspace indexing reports scan progress and applies different failure handling to full and incremental scans.
- Failed incremental scans preserve existing index and cache data. Failed full scans attempt to clear incomplete index data.
- Clearing an index waits for active indexing to stop and prevents overlapping clear or indexing operations.
- Canceled scans return indexing to standby after cache updates. Scan and clearing failures are reflected in indexing status.
- File-change notifications and progress remain tied to the scan that started them, avoiding updates from earlier scans appearing in a later scan.

Walkthrough

The change adds scan execution, run tracking, recovery, and watcher-session components. The orchestrator uses them to select scan modes, manage cancellation and clearing, and handle watcher updates. Tests cover these paths and state notifications.

Changes

Code index scan and lifecycle

Layer / File(s)	Summary
State streams and scan run ownership `src/utils/StateHolder.ts`, `src/utils/__tests__/StateHolder.spec.ts`, `src/services/code-index/code-index-run.ts`, `src/services/code-index/__tests__/code-index-run.spec.ts`	`StateHolder` adds synchronous subscriptions and predicate-based waits. `CodeIndexRun` tracks scan mode, cancellation, and completion. Tests cover notifications and run transitions.
Scan execution and orchestration `src/services/code-index/code-index-scan-executor.ts`, `src/services/code-index/orchestrator.ts`, `src/services/code-index/__tests__/code-index-scan-executor.spec.ts`, `src/services/code-index/__tests__/orchestrator.spec.ts`, `src/eslint-suppressions.json`	The executor reports block progress and applies full- and incremental-scan failure rules. The orchestrator validates start conditions, selects scan modes, and manages scan completion. Tests cover scan outcomes, progress, and start conditions. The orchestrator-test suppression count decreases, and the production orchestrator suppression is removed.
Recovery and index clearing `src/services/code-index/code-index-recovery.ts`, `src/services/code-index/orchestrator.ts`, `src/services/code-index/__tests__/code-index-recovery.spec.ts`, `src/services/code-index/__tests__/orchestrator.spec.ts`	Recovery handles cancellation, scan failures, and clear errors. Clearing cancels and awaits active runs before deleting collection data and clearing the cache. Tests cover cleanup, failure, and retry behavior.
Watcher session and event lifecycle `src/services/code-index/code-index-watcher-session.ts`, `src/services/code-index/processors/file-watcher.ts`, `src/services/code-index/__tests__/code-index-watcher-session.spec.ts`, `src/services/code-index/processors/__tests__/file-watcher.spec.ts`, `src/services/code-index/__tests__/orchestrator.spec.ts`	The watcher session manages startup, progress, completion, and disposal. `FileWatcher` recreates disposed event emitters and routes batch notifications through the emitters captured when each batch starts. Tests cover watcher cancellation, failures, and reinitialization.

Priority: ➖ Normal

Estimated code review effort: 4 (Complex) | ~45 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant CodeIndexOrchestrator
  participant CodeIndexRun
  participant CodeIndexScanExecutor
  participant IDirectoryScanner
  participant CodeIndexRecovery
  CodeIndexOrchestrator->>CodeIndexRun: Create run with abort signal
  CodeIndexOrchestrator->>CodeIndexScanExecutor: Execute selected scan
  CodeIndexScanExecutor->>IDirectoryScanner: Scan workspace
  IDirectoryScanner-->>CodeIndexScanExecutor: Return scan results and progress
  CodeIndexScanExecutor-->>CodeIndexOrchestrator: Return result or error
  CodeIndexOrchestrator->>CodeIndexRecovery: Handle scan error
  CodeIndexOrchestrator->>CodeIndexRun: Finish run

Merge Risk: 🟡 Moderate · up to 73f4c

If an incremental re-index fails, the next retry becomes a full scan. If that retry also fails, the existing index and its cache can be deleted, and users lose search results they previously had. Resolve this before merging.

Security Architecture Review

Security architecture risk: 🟡 Moderate · up to 73f4c

A watcher can restart while an earlier file-change batch is still writing to the index. That creates a timing-dependent risk of stale indexed content or lost updates. The change also strengthens several cancellation and clearing safeguards.

Retained concerns

Medium · security · inferred: Restarting a watcher does not isolate an earlier in-flight batch from the new session’s shared index and cache. A late delete or upsert can therefore change index contents after the prior session has stopped, without notifying the new session.

Security review details

Security Blast Radius

inferred — A party able to change watched workspace files can cause batches that mutate the workspace’s shared vector index and cache. The evidence does not establish cross-tenant reach or a new privilege boundary.

Security Findings and Attack Paths

inferred — If a file-change batch is paused during a store operation when its watcher is stopped and restarted, its later delete or upsert can affect the restarted index. Disposing the old emitters suppresses its completion notification but does not suppress that store operation.

Trust Boundaries and Controls

observed — Run ownership blocks concurrent starts, and cancellation during completion attempts to restore the durable incomplete marker. If that restoration fails, cancellation recovery does not retry it; the base behavior does not establish this as a newly introduced exposure.

Resilience and Maintainability Implications

observed — The scanner awaits queued batches on its ordinary completion path but can return on cancellation before that wait. Thus waiting for the orchestrator’s run alone does not prove all scanner writes have drained before a clear; this behavior was not changed in the scanner by this PR.

Hardening Proposals

proposed — Before restarting or clearing an index, cancel or await outstanding watcher and scanner writes; fence store and cache mutations by session generation so a disposed session cannot write into its successor.

🚥 Pre-merge checks | ✅ 7 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Regression Evidence	⚠️ Warning	Completion-persistence failure lacks focused coverage. `CodeIndexOrchestrator._completeIndexing()` awaits `vectorStore.markIndexingComplete()` at `src/services/code-index/orchestrator.ts:129`; the rea…	Add an orchestrator regression test with existing indexed data and a successful incremental scan, then reject `markIndexingComplete()`. Assert that indexing ends in `Error`, the original error is reported, the watcher is stopped, and neithe…

✅ Passed checks (7 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Security Boundaries	✅ Passed	No changed path meets the security failure conditions. The PR adds orchestration, scan execution, state handling, and watcher lifecycle code, but it does not add shell/dynamic-code execution, secret h…
Persistence Integrity	✅ Passed	No changed persistence path meets the failure condition. `CodeIndexScanExecutor` awaits `markIndexingIncomplete()` and `scanDirectory()`. `CodeIndexOrchestrator` awaits completion-marker writes, colle…
Lifecycle Resource Cleanup	✅ Passed	No changed lifecycle path introduces a listener or watcher leak or duplicate registration. `CodeIndexWatcherSession` removes both event subscriptions and disposes the watcher on stop, including partia…
Title check	✅ Passed	The title clearly and concisely summarizes the main changes: extracting scan execution and strengthening code-index orchestration.
Description check	✅ Passed	The description provides the related issues, implementation details, intentional behavior changes, scope boundaries, and validation results. It does not reproduce the template checklist or provide det…

Full details: Regression Evidence

Explanation

Completion-persistence failure lacks focused coverage. CodeIndexOrchestrator._completeIndexing() awaits vectorStore.markIndexingComplete() at src/services/code-index/orchestrator.ts:129; the real Qdrant implementation can reject. The changed tests cover successful completion and cancellation while completion is pending, but no changed test rejects markIndexingComplete(). This omission is important because CodeIndexRecovery now applies destructive cleanup only when run.fullScanStarted; an incremental completion failure must report Error while preserving the existing collection and cache. The test suite contains no such rejection case.

Resolution

Add an orchestrator regression test with existing indexed data and a successful incremental scan, then reject markIndexingComplete(). Assert that indexing ends in Error, the original error is reported, the watcher is stopped, and neither clearCollection nor clearCacheFile runs. Add the corresponding full-scan rejection assertion if the full-scan cleanup policy is intended to be covered separately.

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github-actions · 2026-09-26T21:01:12Z

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codecov · 2026-09-26T21:04:53Z

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

WebMad · 2026-09-26T21:10:39Z

Addressed the coverage gaps from #1821 (comment) in test-only commit 115f873.

Added 15 test cases and extended the concurrent-clear regression test.
Local V8 coverage: 100% statements, branches, functions and lines for both implementation files identified by Codecov.
673 tests passed across 27 code-index test files.
ESLint, TypeScript checks and diff checks passed; commit/push lint and type-check hooks also passed.
Production code and coverage exclusions were not changed.

Updated CI/Codecov results still need confirmation. Previously documented follow-up limitations remain unchanged; complete measured coverage is not a claim that all indexing lifecycle issues are resolved.

WebMad · 2026-09-26T21:17:04Z

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coderabbitai · 2026-09-26T21:17:25Z

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In @src/services/code-index/orchestrator.ts:
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Check persistence and lifecycle invariants: awaited atomic writes, rollback or explicit partial-failure behavior, cross-window state consistency, stale listeners/watchers, cancellation, idempotency, and safe restart/resume without lost or d...

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src/services/code-index/__tests__/orchestrator.spec.ts
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src/services/code-index/code-index-scan-executor.ts

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🔇 Additional comments (5)

src/services/code-index/code-index-scan-executor.ts (1)

1-118: LGTM!

src/services/code-index/__tests__/code-index-scan-executor.spec.ts (1)

1-79: LGTM!

src/services/code-index/orchestrator.ts (1)

8-8: LGTM!

Also applies to: 18-63, 84-101, 104-255, 278-278, 284-312

src/services/code-index/__tests__/orchestrator.spec.ts (1)

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WebMad · 2026-09-28T12:58:34Z

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src/services/code-index/__tests__/code-index-watcher-session.spec.ts
src/services/code-index/__tests__/orchestrator.spec.ts
src/services/code-index/code-index-recovery.ts
src/services/code-index/code-index-run.ts
src/services/code-index/code-index-scan-executor.ts
src/services/code-index/code-index-watcher-session.ts
src/services/code-index/orchestrator.ts
src/services/code-index/processors/__tests__/file-watcher.spec.ts
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src/services/code-index/__tests__/code-index-recovery.spec.ts
src/services/code-index/code-index-recovery.ts
src/services/code-index/processors/__tests__/file-watcher.spec.ts
src/services/code-index/code-index-run.ts
src/services/code-index/code-index-watcher-session.ts
src/services/code-index/code-index-scan-executor.ts
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src/services/code-index/__tests__/code-index-recovery.spec.ts
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src/services/code-index/code-index-watcher-session.ts
src/utils/StateHolder.ts
src/services/code-index/code-index-scan-executor.ts
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src/services/code-index/orchestrator.ts
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src/services/code-index/__tests__/code-index-scan-executor.spec.ts
src/services/code-index/__tests__/code-index-recovery.spec.ts
src/utils/__tests__/StateHolder.spec.ts
src/services/code-index/code-index-recovery.ts
src/services/code-index/processors/__tests__/file-watcher.spec.ts
src/services/code-index/code-index-run.ts
src/services/code-index/code-index-watcher-session.ts
src/utils/StateHolder.ts
src/services/code-index/code-index-scan-executor.ts
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src/services/code-index/__tests__/code-index-scan-executor.spec.ts
src/services/code-index/__tests__/code-index-recovery.spec.ts
src/utils/__tests__/StateHolder.spec.ts
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src/services/code-index/processors/__tests__/file-watcher.spec.ts
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src/services/code-index/code-index-watcher-session.ts
src/utils/StateHolder.ts
src/services/code-index/code-index-scan-executor.ts
src/services/code-index/processors/file-watcher.ts
src/services/code-index/orchestrator.ts
src/services/code-index/__tests__/orchestrator.spec.ts

🔇 Additional comments (14)

src/services/code-index/code-index-watcher-session.ts (1)

1-109: LGTM!

src/services/code-index/__tests__/code-index-watcher-session.spec.ts (1)

1-179: LGTM!

src/services/code-index/processors/file-watcher.ts (1)

44-72: LGTM!

Also applies to: 116-126, 145-153, 205-214, 227-227, 246-246, 269-269, 287-287, 301-301, 367-367, 452-463, 492-492, 508-508, 521-531

src/services/code-index/processors/__tests__/file-watcher.spec.ts (1)

42-59: LGTM!

Also applies to: 94-188

src/utils/StateHolder.ts (1)

1-64: LGTM!

src/utils/__tests__/StateHolder.spec.ts (1)

1-97: LGTM!

src/services/code-index/code-index-run.ts (1)

1-46: LGTM!

src/services/code-index/__tests__/code-index-run.spec.ts (1)

1-110: LGTM!

src/services/code-index/code-index-scan-executor.ts (1)

1-118: LGTM!

src/services/code-index/__tests__/code-index-scan-executor.spec.ts (1)

1-79: LGTM!

src/services/code-index/__tests__/orchestrator.spec.ts (1)

118-571: LGTM!

Also applies to: 658-702, 760-1155

src/eslint-suppressions.json (1)

1309-1309: LGTM!

src/services/code-index/code-index-recovery.ts (1)

1-93: LGTM!

src/services/code-index/__tests__/code-index-recovery.spec.ts (1)

1-74: LGTM!

taltas · 2026-09-28T13:16:33Z

+	private async _stopAndAwaitIndexing(): Promise<void> {
+		const run = this._activeRun
+		this._requestIndexingCancellation(run)
+		this.codeIndexWatcherSession.stop()


Could this await every active watcher batch before deleting the collection so late vector-store or cache writes cannot repopulate an index after clearing?

taltas · 2026-09-28T13:16:33Z

+			await this._deleteIndexData()
+			this.stateManager.setSystemState("Standby", "Index data cleared successfully.")
+		} catch (error) {
+			this.codeIndexRecovery.handleClearError(error)


Could this rethrow the recorded error so the webview does not report success: true when collection or cache deletion failed?

WebMad requested review from JamesRobert20, edelauna, navedmerchant and taltas as code owners September 26, 2026 21:00

WebMad mentioned this pull request Sep 26, 2026

[ENHANCEMENT] Refactor the code indexing orchestrator #1819

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fix(code-index): preserve existing points across failed retries

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This was referenced Sep 28, 2026

refactor(code-index): extract scan execution without behavior changes #1834

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fix(code-index): restore watcher events after restart #1835

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WebMad mentioned this pull request Sep 28, 2026

refactor(code-index): isolate watcher sessions and preserve batch outcomes #1844

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