Make skipChecks actually skip the expensive read/parse work - #909
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WalkthroughThe change adds a FIFO concurrency limiter and uses it to bound directory reads and removals to 64 operations. Directory results preserve their original order. Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to Theme scans can stall after a synchronous task failure, while skip mode may still read unintended files. These regressions should be fixed before merge. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Review finding (P2): the parallel directory walk introduces quadratic file-list assembly. In In a synthetic comparison with Suggested fix: flatten the per-entry arrays once, or append their elements into one result array using nested loops. Either preserves the existing ordering without repeatedly copying the accumulated result. A wide-directory regression or benchmark would help protect the optimization. |
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Fixed — replaced the |
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Codex flagged (P2) on #909: the parallelized directory walk starts a readdir for every sibling directory at once via Promise.all, with no cap - a theme with thousands of directories (or a maliciously crafted one) could fan out into thousands of simultaneous filesystem operations, risking thread-pool congestion and memory spikes. The existing 5,000-entry regression test only covers files in one directory, so it didn't exercise this. - Add lib/utils/create-limiter.js: a small counting-semaphore (limit(fn) runs fn immediately under the cap, otherwise queues it FIFO). No new dependency. - Wrap the fs.readdir() and the ignored-path fs.rm() calls in readThemeStructure with a single limiter instance shared across the whole recursive walk (passed down through recursive calls), capped at 64 concurrent operations. Scheduling recursive calls themselves stays unbounded (cheap - just queues on the limiter); only the actual filesystem operations are throttled. - Add tests: unit coverage for createLimiter itself, and a readThemeStructure regression test with a mocked 200-directory tree asserting peak concurrent fs.readdir calls never exceeds the cap. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Codex flagged (P2) on #909: the parallelized directory walk starts a readdir for every sibling directory at once via Promise.all, with no cap - a theme with thousands of directories (or a maliciously crafted one) could fan out into thousands of simultaneous filesystem operations, risking thread-pool congestion and memory spikes. The existing 5,000-entry regression test only covers files in one directory, so it didn't exercise this. - Add lib/utils/create-limiter.js: a small counting-semaphore (limit(fn) runs fn immediately under the cap, otherwise queues it FIFO). No new dependency. - Wrap the fs.readdir() and the ignored-path fs.rm() calls in readThemeStructure with a single limiter instance shared across the whole recursive walk (passed down through recursive calls), capped at 64 concurrent operations. Scheduling recursive calls themselves stays unbounded (cheap - just queues on the limiter); only the actual filesystem operations are throttled. - Add tests: unit coverage for createLimiter itself, and a readThemeStructure regression test with a mocked 200-directory tree asserting peak concurrent fs.readdir calls never exceeds the cap. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Previously skipChecks:true only skipped the rule-check loop in checker.js - readTheme still read every .css/.js/.hbs file's content and ran the full Handlebars AST parse (theme.helpers) even though nothing consumed that output. - Thread options (skipChecks) from check() through readTheme() into readFiles(), which now skips the AST parse/processHelpers and the .hbs/.css/.js content reads when skipChecks is true, only reading package.json (for customSettings). partials are derived from file paths instead of content. - Parallelize readThemeStructure's directory walk (Promise.all over readdir entries instead of a sequential walk) - pure I/O win for both skipChecks and non-skipChecks callers. Flattens the per-entry results in a single linear pass (nested for-loops) rather than repeatedly .concat()-ing onto the accumulator, which re-copies the whole accumulated array on every directory entry and is O(n^2) for a wide directory. - Add tests covering skipChecks correctness, unchanged non-skipChecks behavior, stable file ordering after parallelizing the walk, and a 5000-entry wide-directory correctness check for the flattening fix. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Codex flagged (P2) on #909: the parallelized directory walk starts a readdir for every sibling directory at once via Promise.all, with no cap - a theme with thousands of directories (or a maliciously crafted one) could fan out into thousands of simultaneous filesystem operations, risking thread-pool congestion and memory spikes. The existing 5,000-entry regression test only covers files in one directory, so it didn't exercise this. - Add lib/utils/create-limiter.js: a small counting-semaphore (limit(fn) runs fn immediately under the cap, otherwise queues it FIFO). No new dependency. - Wrap the fs.readdir() and the ignored-path fs.rm() calls in readThemeStructure with a single limiter instance shared across the whole recursive walk (passed down through recursive calls), capped at 64 concurrent operations. Scheduling recursive calls themselves stays unbounded (cheap - just queues on the limiter); only the actual filesystem operations are throttled. - Add tests: unit coverage for createLimiter itself, and a readThemeStructure regression test with a mocked 200-directory tree asserting peak concurrent fs.readdir calls never exceeds the cap. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Review finding (P2): After #912, Suggested fix: skip symlinked entries while deriving partials ( |
After the #912 symlink-content-read fix, readFiles' normal (non- skipChecks) path never adds a symlinked partial to theme.partials - themeFilesContent excludes every themeFile.symlink before any partial derivation happens. The skipChecks branch derives partials by iterating theme.files directly, without that same check, so a symlinked partial (e.g. partials/escape.hbs) was included there but not otherwise. theme.partials is consumed downstream for theme activation regardless of skipChecks, so this made that metadata depend on skipChecks - a theme could get symlink-hardening on the normal path but not on the boot-optimization path scanning the exact same files. Added a regression test comparing readFiles() with and without skipChecks for the same symlinked-partial input, asserting both exclude it identically. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Good catch — fixed in 073bab9. The skipChecks partial-derivation loop now skips |
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Inline comments:
In `@lib/read-theme.js`:
- Line 147: Update the package-file check in the skip-mode filtering logic to
use an exact equality comparison with “package.json” instead of the current
case-insensitive pattern match, ensuring only the root package settings file is
selected.
In `@lib/utils/create-limiter.js`:
- Line 26: Update createLimiter so synchronous exceptions from fn are caught
before promise handlers are attached; decrement active, invoke runNext(), and
reject the current task promise. Add a regression test confirming a
synchronously throwing task releases its slot and allows queued tasks to
proceed.
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lib/checker.jslib/read-theme.jslib/utils/create-limiter.jslib/utils/index.jstest/checker.test.jstest/create-limiter.test.jstest/read-theme.test.js
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…e.json match Two CodeRabbit findings on lib/utils/create-limiter.js and the skipChecks readFiles() filter: - createLimiter called fn() directly before attaching .then()/.finally(). A task that throws synchronously (rather than returning a rejected promise) skipped the .finally() that decrements `active`, permanently leaking that concurrency slot - enough synchronous throws would stall the queue forever. Deferred the fn() call into the promise chain (Promise.resolve().then(fn)) so a sync throw is caught the same as an async rejection. Not currently reachable through gscan's own call sites (fs.readdir/fs.rm never throw synchronously), but createLimiter is a general-purpose exported utility, not scoped to this one caller. - The skipChecks content-read filter used the loose themeFile.file.match(/package.json/i) (pre-existing pattern, copied from the non-skipChecks filter below it) to decide what to read. Tightened to an exact themeFile.file === 'package.json' check for the skipChecks branch specifically, since skipChecks exists to minimize reads - a nested vendor/package.json or an unrelated assets/package.json.hbs shouldn't be read just because its name contains the substring. Left the non-skipChecks filter's existing loose match untouched (out of scope - unrelated to this optimization, and already harmless there since only an exact-match check further down ever acts on the content). Added regression tests for both: a synchronously-throwing limiter task that still releases its slot for the next queued task, and a skipChecks readFiles() call with a nested/lookalike package.json confirming only the root file is read. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Previously skipChecks:true only skipped the rule-check loop in
checker.js - readTheme still read every .css/.js/.hbs file's content
and ran the full Handlebars AST parse (theme.helpers) even though
nothing consumed that output.
readFiles(), which now skips the AST parse/processHelpers and the
.hbs/.css/.js content reads when skipChecks is true, only reading
package.json (for customSettings). partials are derived from file
paths instead of content.
readdir entries instead of a sequential .reduce() chain) - pure I/O
win for both skipChecks and non-skipChecks callers.
behavior, and stable file ordering after parallelizing the walk.
Co-Authored-By: Claude Sonnet 5 noreply@anthropic.com
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