49 lines
1.6 KiB
JavaScript
49 lines
1.6 KiB
JavaScript
import { BaseRetriever } from "@langchain/core/retrievers";
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import { Document } from "@langchain/core/documents";
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/**
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* Class used to interact with the Metal service, a managed retrieval &
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* memory platform. It allows you to index your data into Metal and run
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* semantic search and retrieval on it. It extends the `BaseRetriever`
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* class and requires a `Metal` instance and a dictionary of parameters to
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* pass to the Metal API during its initialization.
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* @example
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* ```typescript
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* const retriever = new MetalRetriever({
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* client: new Metal(
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* process.env.METAL_API_KEY,
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* process.env.METAL_CLIENT_ID,
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* process.env.METAL_INDEX_ID,
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* ),
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* });
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* const docs = await retriever.getRelevantDocuments("hello");
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* ```
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*/
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export class MetalRetriever extends BaseRetriever {
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static lc_name() {
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return "MetalRetriever";
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}
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constructor(fields) {
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super(fields);
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Object.defineProperty(this, "lc_namespace", {
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enumerable: true,
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configurable: true,
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writable: true,
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value: ["langchain", "retrievers", "metal"]
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});
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Object.defineProperty(this, "client", {
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enumerable: true,
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configurable: true,
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writable: true,
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value: void 0
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});
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this.client = fields.client;
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}
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async _getRelevantDocuments(query) {
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const res = await this.client.search({ text: query });
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const items = ("data" in res ? res.data : res);
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return items.map(({ text, metadata }) => new Document({
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pageContent: text,
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metadata: metadata,
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}));
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}
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}
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