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Copy pathbackends.ts
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88 lines (76 loc) · 2.68 KB
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import { type GalleryEmbedding, type SearchResult, searchEmbeddings } from "./search";
export type PublicSearchResult = Omit<SearchResult, "vector">;
export type PublicSearchMetadata = Partial<Omit<PublicSearchResult, "id" | "score" | "rank">>;
export type SearchMetadataStore = {
getByIds(ids: string[]): Promise<Map<string, PublicSearchMetadata>>;
};
export type SearchBackend = {
readonly name: string;
search(embedding: number[], topK: number): Promise<PublicSearchResult[]>;
};
type VectorizeMatch = {
id: string;
score: number;
metadata?: Record<string, unknown>;
};
export type VectorizeIndex = {
query(
vector: number[],
options: {
topK: number;
returnMetadata: "all" | "indexed" | "none";
},
): Promise<{ matches: VectorizeMatch[] }>;
};
function toPublicResults(results: SearchResult[]): PublicSearchResult[] {
return results.map(({ vector: _vector, ...result }) => result);
}
function stringMetadata(metadata: Record<string, unknown>, key: string): string | undefined {
const value = metadata[key];
return typeof value === "string" ? value : undefined;
}
function numberMetadata(metadata: Record<string, unknown>, key: string): number | undefined {
const value = metadata[key];
return typeof value === "number" && Number.isFinite(value) ? value : undefined;
}
export function createLocalSearchBackend(gallery: GalleryEmbedding[]): SearchBackend {
return {
name: "local",
async search(embedding, topK) {
return toPublicResults(searchEmbeddings(embedding, gallery, topK));
},
};
}
export function createVectorizeSearchBackend(
index: VectorizeIndex,
metadataStore?: SearchMetadataStore,
): SearchBackend {
return {
name: "vectorize",
async search(embedding, topK) {
const response = await index.query(embedding, {
topK,
returnMetadata: "all",
});
const metadataById = metadataStore
? await metadataStore.getByIds(response.matches.map((match) => match.id))
: new Map<string, PublicSearchMetadata>();
return response.matches.map((match, index) => {
const vectorizeMetadata = match.metadata ?? {};
const d1Metadata = metadataById.get(match.id) ?? {};
const metadata = { ...vectorizeMetadata, ...d1Metadata };
return {
id: match.id,
label: stringMetadata(metadata, "label") ?? match.id,
floor: stringMetadata(metadata, "floor"),
zone: stringMetadata(metadata, "zone"),
imagePath: stringMetadata(metadata, "imagePath"),
x: numberMetadata(metadata, "x"),
y: numberMetadata(metadata, "y"),
score: match.score,
rank: index + 1,
};
});
},
};
}