72 lines
2.9 KiB
JavaScript
72 lines
2.9 KiB
JavaScript
"use strict";
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var __importDefault = (this && this.__importDefault) || function (mod) {
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return (mod && mod.__esModule) ? mod : { "default": mod };
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};
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.LocalFileCache = void 0;
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const node_path_1 = __importDefault(require("node:path"));
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const promises_1 = __importDefault(require("node:fs/promises"));
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const caches_1 = require("@langchain/core/caches");
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/**
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* A cache that uses the local filesystem as the backing store.
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* This is useful for local development and testing. But it is not recommended for production use.
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*/
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class LocalFileCache extends caches_1.BaseCache {
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constructor(cacheDir) {
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super();
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Object.defineProperty(this, "cacheDir", {
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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.cacheDir = cacheDir;
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}
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/**
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* Create a new cache backed by the local filesystem.
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* It ensures that the cache directory exists before returning.
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* @param cacheDir
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*/
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static async create(cacheDir) {
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if (!cacheDir) {
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// eslint-disable-next-line no-param-reassign
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cacheDir = await promises_1.default.mkdtemp("langchain-cache-");
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}
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else {
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// ensure the cache directory exists
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await promises_1.default.mkdir(cacheDir, { recursive: true });
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}
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return new LocalFileCache(cacheDir);
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}
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/**
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* Retrieves data from the cache. It constructs a cache key from the given
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* `prompt` and `llmKey`, and retrieves the corresponding value from the
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* cache files.
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* @param prompt The prompt used to construct the cache key.
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* @param llmKey The LLM key used to construct the cache key.
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* @returns An array of Generations if found, null otherwise.
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*/
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async lookup(prompt, llmKey) {
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const key = `${(0, caches_1.getCacheKey)(prompt, llmKey)}.json`;
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try {
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const content = await promises_1.default.readFile(node_path_1.default.join(this.cacheDir, key));
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return JSON.parse(content.toString()).map(caches_1.deserializeStoredGeneration);
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}
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catch {
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return null;
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}
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}
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/**
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* Updates the cache with new data. It constructs a cache key from the
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* given `prompt` and `llmKey`, and stores the `value` in a specific
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* file in the cache directory.
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* @param prompt The prompt used to construct the cache key.
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* @param llmKey The LLM key used to construct the cache key.
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* @param generations The value to be stored in the cache.
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*/
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async update(prompt, llmKey, generations) {
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const key = `${(0, caches_1.getCacheKey)(prompt, llmKey)}.json`;
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await promises_1.default.writeFile(node_path_1.default.join(this.cacheDir, key), JSON.stringify(generations.map(caches_1.serializeGeneration)));
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}
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}
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exports.LocalFileCache = LocalFileCache;
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