Cache requests for blob and tree objects — radicle-explorer

We improve the performance of source browsing by caching requests to content-addressable blob and tree objects.

 import { LRUCache } from "lru-cache";
 import type { Commit, Commits } from "./project/commit.js";
 import type { Embed } from "./project/comment.js";
 import type { Fetcher, RequestOptions } from "./fetcher.js";

 export class Client {
   #fetcher: Fetcher;
   // We make the cache a static variable because clients are usually not
   // persisted and new instances are frequently created.
   static #cache = {
     tree: new LRUCache<string, Tree>({ max: 300 }),
     blob: new LRUCache<string, Blob>({ max: 500 }),
   };
   public constructor(fetcher: Fetcher) {
     this.#fetcher = fetcher;
   }

     path: string,
     options?: RequestOptions,
   ): Promise<Blob> {
     return this.#fetcher.fetchOk(
     const cacheKey = `blob:${sha}:${path}`;
     const cachedBlob = Client.#cache.blob.get(cacheKey);
     if (cachedBlob) {
       return cachedBlob;
     }
     const blob = await this.#fetcher.fetchOk(
       {
         method: "GET",
         path: `projects/${id}/blob/${sha}/${path}`,

       },
       blobSchema,
     );
     Client.#cache.blob.set(cacheKey, blob);
     return blob;
   }
   public async getTree(

     path?: string,
     options?: RequestOptions,
   ): Promise<Tree> {
     return this.#fetcher.fetchOk(
     const cacheKey = `tree:${sha}:${path}`;
     const cachedTree = Client.#cache.tree.get(cacheKey);
     if (cachedTree) {
       return cachedTree;
     }
     const tree = await this.#fetcher.fetchOk(
       {
         method: "GET",
         path: `projects/${id}/tree/${sha}/${path ?? ""}`,

       },
       treeSchema,
     );
     Client.#cache.tree.set(cacheKey, tree);
     return tree;
   }
   public async getAllRemotes(

         "hast-util-to-dom": "^4.0.0",
         "hast-util-to-html": "^9.0.0",
         "lodash": "^4.17.21",
         "lru-cache": "^10.2.0",
         "marked": "^11.1.1",
         "marked-katex-extension": "^5.0.0",
         "marked-linkify-it": "^3.1.8",

         "get-func-name": "^2.0.1"
       }
     },
     "node_modules/lru-cache": {
       "version": "10.2.0",
       "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-10.2.0.tgz",
       "integrity": "sha512-2bIM8x+VAf6JT4bKAljS1qUWgMsqZRPGJS6FSahIMPVvctcNhyVp7AJu7quxOW9jwkryBReKZY5tY5JYv2n/7Q==",
       "engines": {
         "node": "14 || >=16.14"
       }
     },
     "node_modules/magic-string": {
       "version": "0.30.5",
       "resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.30.5.tgz",