feat(mister): match arcade gamelists by MRA set name - #1437
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📝 WalkthroughWalkthroughThis change adds MiSTer and Mistex arcade set-name matching. The scraper parses MRA ChangesMiSTer arcade set matching
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to MiSTer arcade metadata can be attached to a different MRA than the existing slug match for entries with conflicting set and title identities. Resolve the matching precedence before merge to prevent incorrect artwork and metadata writes. Sequence Diagram(s)sequenceDiagram
participant GamelistXMLScraper
participant DirectMatcher
participant arcadeMediaForSet
participant MediaWriter
GamelistXMLScraper->>DirectMatcher: resolve direct path or container match
DirectMatcher-->>GamelistXMLScraper: matched or unmatched record
GamelistXMLScraper->>arcadeMediaForSet: resolve deferred arcade set
arcadeMediaForSet-->>GamelistXMLScraper: unique media row or ambiguous result
GamelistXMLScraper->>MediaWriter: write metadata and set-specific artwork safely
Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 28.57% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 14 functions across 3 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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Inline comments:
In `@pkg/database/scraper/gamelistxml/scraper.go`:
- Line 496: Update the media-selection flow around arcadeMediaForSet so
direct-path and slug matching run before the unique set-name fallback. Preserve
blocking for ambiguous known sets, and only accept a unique set-name candidate
when neither direct-path nor slug selection produces a target.
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📒 Files selected for processing (4)
docs/scraper.mdpkg/database/scraper/gamelistxml/arcade.gopkg/database/scraper/gamelistxml/arcade_test.gopkg/database/scraper/gamelistxml/scraper.go
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Set-name records replaced the artwork fallback names with a single "<set>.png", so a bundle whose images are JPG, JPEG or WebP found nothing while the same files matched for every other kind of record. Build the fallbacks from the shared extension list instead and keep the ROM-relative names as a lower-priority fallback. Read descriptors with one stat call rather than a stat followed by an lstat, count unresolvable and superseded set entries in the record load summary, and log what the set-name index read so a run that matches nothing is distinguishable from the feature being off.
Real MiSTer MRAs embed their ROM payload as base64 and run to tens of megabytes: 50 of the 3137 arcade descriptors on the test device exceed the 256 KiB whole-file bound, so Zaxxon, Carnival and every CPS2 hack could never be matched by set name. Parse to the first <rom> element instead, which every descriptor in a 15k-file corpus writes after its set name, and drop the file size limit. Repeated, nested and missing set names in the header are still rejected, as are malformed documents, trailing documents and headers that outrun the read bound. Also scrape a system whose launcher has no scan folders when a custom bundle is installed for it. The granular arcade systems (CPS1, IremM72 and the rest) are classified out of _Arcade rather than walked, so path discovery finds nothing for them and their bundle was silently ignored, which is the layout the scraper documentation asks users to set up. Measured on the MiSTer test device, indexing 3137 arcade descriptors: 8.5s with the 256 KiB whole-file bound (55 unusable), 40.6s at a 32 MiB bound (7 unusable), 3.2s reading headers only (5 unusable).
MAME clone sets share one display name, so an arcade gamelist normally holds several entries called "R-Type". An entry whose own set is not indexed slug-matched that title, took the MRA the entry naming the set had claimed, and then wrote nothing at media level because a first-media slug fallback is not media-level safe. On the test device the canonical R-Type (World) came out of a scrape with no metadata at all. Rank a set name above a slug-only or slug-conflict record and below every record that named the row by path. The comparison happens in the deferred merge pass, so the outcome no longer depends on which of the two entries the parser reached first.
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Closes #913
<setname>, including externally stored custom bundles.Based directly on main; does not include or depend on #1436.
Fixes from on-device review
Verified against the real
_Arcadelibrary on the MiSTer test device (15,438 MRA files, 3,137 indexed asArcade). Four problems the unit tests could not see:Artwork fallback was PNG-only. Set-name records replaced the fallback names with a single
<set>.png, so a bundle whose images are JPG, JPEG or WebP found nothing while the same files matched for every other kind of record. Now built from the shared extension list, with the ROM-relative names kept as a lower-priority fallback.The 256 KiB descriptor bound excluded real games. MRAs embed their ROM payload as base64 and reach 25 MB; 50 of the 3,137 indexed arcade descriptors are over 256 KiB, including Zaxxon, Carnival, Cosmic Alien and the CPS2 hacks. Parsing now stops at the first
<rom>element, which every descriptor in the corpus writes after its set name, and the file size limit is gone. Repeated, nested and missing set names in the header are still rejected, as are malformed documents, trailing documents and headers that outrun the read bound. This is also faster than the original: 3.2s to read all 3,137 descriptors, against 8.5s for the 256 KiB whole-file bound and 40.6s at a 32 MiB one.Granular arcade systems were never scraped.
CPS1,IremM72and the rest are classified out of_Arcaderather than walked, so path discovery resolves zero ROM paths for them andresolveSystemsFromPlatformskipped them — the bundle layout the documentation asks users to set up was silently ignored. A system with no launcher scan folders is now kept when a custom bundle is installed for it.A title guess could displace an exact set-name match. MAME clone sets share one display name, so an arcade gamelist normally holds several entries called "R-Type". An entry whose own set is not indexed slug-matched the title, took the MRA the set-name entry had claimed, and then wrote nothing at media level because a first-media slug fallback is not media-level safe: a scrape left the canonical
R-Type (World).mrawith no metadata at all. Evidence is now ranked — indexed path or container, then a slug the entry's own path confirms, then<setname>, then a slug alone — and compared in the deferred merge pass, so the outcome no longer depends on which entry the parser reached first. This is the reverse of CodeRabbit's suggested ordering; see the review thread for why that direction sends a clone's metadata to the parent's MRA.Also: read each descriptor with one stat rather than a stat plus an lstat, count unresolvable and superseded set entries in the record-load summary, and log what the set-name index read so a run that matches nothing is distinguishable from the feature being off.
Verification
A Skraper-style bundle covering nine entries — relative
.zip,.7z, uppercase.ZIP, a foreign absolute POSIX path, a Windows path, artwork found bymedia/fallback, and one entry with no indexed set — scraped against the device's real library: 8/8 set entries matched their exact MRA, 0 superseded, artwork resolved from.png,.jpgand.webp. Bothmister-vmscenarios (launch,service) pass. Full test suite with race detection,task lint,task cross-lint:allandtask vulncheckclean; the arcade parser fuzz target ran 4.5M executions without a failure.