fix(localusage): fix the local-usage reader defects the reviewers found - #1893
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. 📝 WalkthroughWalkthroughCursor, Grok, and Hermes local usage readers now report malformed or changed data formats. The Cursor reader also rejects token values outside JavaScript’s safe-integer range. Tests cover the reader changes and isolate fixture scans from store-specific environment overrides. ChangesLocal usage reader validation
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Merge Risk: 🟡 Moderate · up to Some unreadable Cursor usage can go unreported, while Grok totals can include superseded or malformed turns. Correct these cases before merging. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The reviewed changes add no permissions or external access and make several unreadable-data cases visible. Remaining risk concerns reporting consistency and compatibility with producer formats, rather than newly exposed privileged operations. Retained concerns Security review detailsSecurity Blast Radius
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🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Actionable comments posted: 3
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @src/lib/localUsage/cursorReader.ts:
- Around line 449-450: Update the metaRows handling so only an empty result
silently skips the session; when a row exists, validate its value is a string
and report unreadable metadata for NULL or BLOB values. Add regression fixtures
covering both present NULL and BLOB values.
Review comments at @src/lib/localUsage/grokReader.ts:
- Around line 307-309: Update the unrecognized-usage branch in foldStream so a
turn_completed record with invalid usage removes any previously stored turn for
the same prompt ID; keep valid records stored as before so a later valid
replacement can contribute to totals.
- Around line 222-237: Update isTurnUsage to reject non-finite counter values so
malformed usage records are not counted as requests; validate counters as
finite, nonnegative values while preserving the existing requirement that at
least one recognized counter is present.
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📒 Files selected for processing (4)
src/lib/localUsage/cursorReader.tssrc/lib/localUsage/grokReader.tssrc/lib/localUsage/hermesReader.tstest/continuous-test-suite-local-usage.ts
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Four readers could report "parsed nothing" as "used nothing", or return a
count that is not exact. Each now refuses or reports instead.
- cursorReader: decodeMessage's varint() stopped only at shift > 53, so the
eighth byte (shift 49) could carry the sum past Number.MAX_SAFE_INTEGER and
the reader returned a rounded token count; a rounded sum can even equal a
rounded stated total and pass the cross-check. Reject any non-safe integer.
- cursorReader: a meta row that is not hex, not JSON, or has no
latestRootBlobId ended in a bare `continue` after the store was counted in
filesScanned. It now pushes a scan error (one parse helper replaces the
three exits). A store with no meta row yet stays silent: that is a new
session, not a format change.
- grokReader: completedTurn accepted any non-null `usage`, so `{}`, `[]` or
renamed counters became one request of zero tokens. usage must now be a
non-array object with a numeric inputTokens, outputTokens or modelCalls;
otherwise the turn is skipped and one error per stream reports how many.
- hermesReader: a session_model_usage table missing a required column set
hasUsage to false and silently fell back to the sessions aggregate, which
omits every non-primary task. It now fails closed with a scan error, the
way a sessions table missing columns already did.
- test suite: withHome() cleared only HOME/USERPROFILE, but GROK_HOME and
HERMES_HOME are read ahead of ~/.grok and ~/.hermes, so Grok and Hermes
fixture scans read a real store when either was exported. Both are cleared
for the call and restored after.
Tests (test/continuous-test-suite-local-usage.ts, built dist): four new or
strengthened cases failed against unchanged source (meta-row report, varint
overflow, Grok usage shape, Hermes partial table) and pass now. With
GROK_HOME and HERMES_HOME pointing at an external store, 8 Grok/Hermes cases
failed without the withHome change and all pass with it.
Findings addressed, with the PR each came from:
- T3888333138 (#1604) cursor varint beyond MAX_SAFE_INTEGER
- T3888333141 (#1604) cursor unreadable meta row silent
- T3909080853-usage-shape (#1613) grok accepts any non-null usage object
- T3909080867-hermes-partial-usage (#1613) hermes partial usage table
- T3909080878-grok-home-isolation (#1613) withHome ignores GROK_HOME/HERMES_HOME
Not changed:
- PF-T3840696361 (#1496) asked for sinceDays: Number.MAX_VALUE to return an
empty window. The finite-cutoff part is already fixed (scanWindow.ts
resolveScanCutoffMs returns undefined on overflow, openCodeReader uses
?? 0). An empty window is the opposite of the contract set by 396553c: a
window longer than any history means all history, pinned by the MAX_VALUE
case in this suite, and the reverse produced a non-monotonic cliff.
Fixes from the review of this PR, found after it was opened:
- cursorReader: a meta row holding NULL or a BLOB took the silent no-meta-row exit,
because the lookup keeps only string values. Only an empty meta table is
silent now; a row with no text value is reported like any unreadable one.
- grokReader: isTurnUsage accepted Infinity (`1e999` is valid JSON), which
count() reads as 0, so a malformed turn was billed as one request of zero
tokens. Every present ledger counter must now be finite.
- grokReader: a later record for a prompt id whose usage cannot be read left
the earlier turn in the totals. It is dropped now (last write wins).
Three cases fail without these changes (52 of 55 pass) and all 55 pass with them.
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Summary
Four local-usage readers could report "parsed nothing" as "used nothing", or return a token count that was not exact. Each now refuses or reports the problem instead.
What changed
Four readers could report "parsed nothing" as "used nothing", or return a
count that is not exact. Each now refuses or reports instead.
eighth byte (shift 49) could carry the sum past Number.MAX_SAFE_INTEGER and
the reader returned a rounded token count; a rounded sum can even equal a
rounded stated total and pass the cross-check. Reject any non-safe integer.
latestRootBlobId ended in a bare
continueafter the store was counted infilesScanned. It now pushes a scan error (one parse helper replaces the
three exits). A store with no meta row yet stays silent: that is a new
session, not a format change.
usage, so{},[]orrenamed counters became one request of zero tokens. usage must now be a
non-array object with a numeric inputTokens, outputTokens or modelCalls;
otherwise the turn is skipped and one error per stream reports how many.
hasUsage to false and silently fell back to the sessions aggregate, which
omits every non-primary task. It now fails closed with a scan error, the
way a sessions table missing columns already did.
HERMES_HOME are read ahead of ~/.grok and ~/.hermes, so Grok and Hermes
fixture scans read a real store when either was exported. Both are cleared
for the call and restored after.
Tests (test/continuous-test-suite-local-usage.ts, built dist): four new or
strengthened cases failed against unchanged source (meta-row report, varint
overflow, Grok usage shape, Hermes partial table) and pass now. With
GROK_HOME and HERMES_HOME pointing at an external store, 8 Grok/Hermes cases
failed without the withHome change and all pass with it.
Findings addressed, with the PR each came from:
Not changed:
empty window. The finite-cutoff part is already fixed (scanWindow.ts
resolveScanCutoffMs returns undefined on overflow, openCodeReader uses
?? 0). An empty window is the opposite of the contract set by 396553c: a
window longer than any history means all history, pinned by the MAX_VALUE
case in this suite, and the reverse produced a non-monotonic cliff.
Fixes from the review of this PR, found after it was opened:
because the lookup keeps only string values. Only an empty meta table is
silent now; a row with no text value is reported like any unreadable one.
1e999is valid JSON), whichcount() reads as 0, so a malformed turn was billed as one request of zero
tokens. Every present ledger counter must now be finite.
the earlier turn in the totals. It is dropped now (last write wins).
Three cases fail without these changes (52 of 55 pass) and all 55 pass with them.
Review before opening
After the commit, an independent read-only reviewer checked all 6 findings against the diff, and a second reviewer tried to refute everything it flagged. Result: 5 fixed, 1 already correct at the base.
After the PR was opened, CodeRabbit raised three more findings. I checked each against the code: all three were real, and two were gaps in this PR's own first fix (a Cursor meta row holding NULL or a BLOB was skipped silently; a Grok usage counter of
1e999was accepted). They are fixed in the amended commit and listed at the end of the commit message above.Not done
-Infinityand deliberately reads all history forMAX_VALUE, so the thread's remaining gap does not exist in the code.Verification
pnpm run test:local-usage: 55 passed, exit 0, with an emptyHOMEand no.env.cursorReader.tsandgrokReader.tsreversed and the project rebuilt, 52 pass and exactly the three new or extended cases fail (the Cursor meta-row case, the Grok non-finite counter, the Grok replaced turn); with the fix restored all 55 pass.release(clean, no conflicts). The pre-push hook (check:deps, build, provider-structure, model-manifests) and CI are the first runs on the rebased code.Yama PR Reviewfails on every PR at the moment (its LiteLLM key is invalid). It is not a required check and is unrelated to this change.