feat(images): document the image-variant vocabulary and add the large tier - #17
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Silo sends metadata and image-resolver plugins a semantic image-variant hint on ResolveImageURL(s)Request and ResolveCatalogImageURLsRequest, but the vocabulary was documented nowhere and plugins hardcoded the strings. The server now supports client-selectable image sizes and will start sending "large" (~780px posters/stills, ~1280px logos/backdrops) between "featured" and "full". Export the canonical values from a new pkg/pluginsdk/imagevariant package, document the vocabulary on the proto fields and in docs, and state the two contract rules: the set is open and grows additively, and a plugin receiving an unknown variant must degrade to its nearest supported size rather than error. Additive and comment-only on the wire: the regenerated .pb.go diff is struct-field doc comments only. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe change adds canonical image variant constants and documents an extensible image-size vocabulary. Protobuf contracts and runtime documentation now require graceful fallback for unknown or empty variants. ChangesImage variant vocabulary
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🟡 Moderate · up to The PR adds the image-variant vocabulary but currently gives clients conflicting guidance about what an empty variant means across request types, which could cause plugins and hosts to select different defaults. Clarify the receiver-specific behavior before merging. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@pkg/pluginsdk/imagevariant/imagevariant.go`:
- Around line 4-8: Clarify the image variant documentation for
ResolveImageURLRequest, ResolveImageURLsRequest, and
ResolveCatalogImageURLsRequest to state the receiver-specific empty-variant
behavior: use the plugin default for metadata-provider RPCs and the host default
for runtime-host RPCs. Align the corresponding wording in
metadata_provider.proto and runtime_host.proto with this rule.
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⛔ Files ignored due to path filters (2)
pkg/pluginproto/silo/plugin/v1/metadata_provider.pb.gois excluded by!**/*.pb.gopkg/pluginproto/silo/plugin/v1/runtime_host.pb.gois excluded by!**/*.pb.go
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docs/compatibility.mddocs/runtime-host.mdpkg/pluginsdk/imagevariant/imagevariant.gopkg/pluginsdk/imagevariant/imagevariant_test.goproto/silo/plugin/v1/metadata_provider.protoproto/silo/plugin/v1/runtime_host.proto
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An empty variant resolves to the plugin default on the metadata-provider RPCs and the host default on the RuntimeHost RPC; the package doc claimed "host default" for all three. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Addressed in 8ef0e20 — the package doc now states the receiver-specific rule (plugin default on the metadata-provider RPCs, host default on the RuntimeHost RPC). The two proto comments already carried the correct per-receiver wording, so only the Go doc needed aligning. |
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| // Original requests the unresized source asset, with no host or plugin | ||
| // downscaling. It is also the conventional fallback for an empty or | ||
| // unrecognized variant. |
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When an implementer follows this exported constant's GoDoc, an empty request may be mapped to original, contradicting the package-level and protobuf contracts that empty selects the receiver-specific default. For hosts or plugins whose default is a resized rendition, this would unexpectedly serve source assets and increase bandwidth and memory usage; reserve this fallback guidance for recognized original requests and direct empty values to the receiver default.
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Problem
The semantic image-variant hint the server sends with image-resolution RPCs (
ResolveImageURLRequest.variantand friends) had no documented vocabulary and no SDK constants — plugins hardcode strings, and one proto comment even advertised a"thumbnail"value the server never sends. Silo-Server/silo-server#742 introduces client-selectable artwork sizes, and the server now emits a new"large"tier (~780px posters/stills, ~1280px backdrops/logos) betweenfeaturedandfull/original.Approach
Purely additive, no wire change (the field is an open string):
pkg/pluginsdk/imagevariantpackage with the canonical constantsCard,Featured,Large,Full,Original, each documented with its target size band, plus the two contract rules: the set is open and grows additively, and a plugin receiving an unknown variant must degrade gracefully to its nearest size and never error.metadata_provider.proto,runtime_host.proto) and regenerated (make proto— comments-only diff, no descriptor/wire change, verified). The stale"thumbnail"example is gone.docs/runtime-host.mdgains an "Image variants" section;docs/compatibility.mddocuments the open-vocabulary policy.First-party plugins already degrade gracefully today (tmdb/metadb → original, tvdb → full art), so the server sends
"large"unconditionally with no version gating. Coordinated plugin adoption: Silo-Server/silo-plugin-metadata-tmdb PR follows.Verification
go build ./...,go vet ./...,go test ./...all clean, including the new package's canonical-values test. Proto regen diff inspected: comment lines only in the two.pb.gofiles.Related issue: N/A — SDK half of Silo-Server/silo-server#742.
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Summary by CodeRabbit
New Features
Documentation