From d1a1b7dc947063aef5f8375a6a1e03246b272c84 Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Wed, 18 Aug 2021 17:29:55 +0200
Subject: Implemented caching for certain API endpoints, Added documentation &
 made backend-fixes

---
 packages/server/src/cache/index.ts | 64 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 packages/server/src/cache/index.ts

(limited to 'packages/server/src/cache/index.ts')

diff --git a/packages/server/src/cache/index.ts b/packages/server/src/cache/index.ts
new file mode 100644
index 0000000..9bb4abd
--- /dev/null
+++ b/packages/server/src/cache/index.ts
@@ -0,0 +1,64 @@
+/**
+ * Utilities for managing server-side cache
+ *
+ * @module cache
+ */
+
+import { caching, Cache } from "cache-manager";
+import { cacheAllSources, CacheSource } from "./sources";
+import { CacheConfig } from "../types";
+
+export *as sources from "./sources";
+
+export class ServerCache {
+	private _cache: Cache;
+
+	public ready = false;
+
+	/**
+	 * @param [config] - Cache configuration from the settings
+	 */
+	constructor(config?: Omit<CacheConfig, "enabled">) {
+		this._cache = caching({
+			store: "memory",
+			max: config?.max || 5000000,
+			ttl: config?.ttl || 120,
+			refreshThreshold: config?.refreshThreshold || 80
+		});
+	}
+
+	/**
+	 * Returns the cache value specified in the source & caches it if need be
+	 *
+	 * @template T - The constructor of a cache source
+	 * @param Source - Information about where to get the value from
+	 * @param args - Source arguments
+	 * @returns A value from the cache
+	 */
+	// eslint-disable-next-line @typescript-eslint/no-explicit-any
+	public async receive<T extends new(...args: any[]) => CacheSource>(Source: T, ...args: ConstructorParameters<T>): Promise<unknown> {
+		const source = new Source(...args);
+
+		const result = await this._cache.wrap(source.key(), () => source.func()) as T;
+
+		return source.post
+			? source.post(result) as T
+			: result;
+	}
+
+	/**
+	 * Initialize the cache.
+	 * This will cache all of the available sources.
+	 *
+	 * @param git_dir - A git directory
+	 */
+	public async init(git_dir: string): Promise<void> {
+		if(this.ready === true) {
+			throw(new Error("Cache has already been initialized!"));
+		}
+
+		await cacheAllSources(this, git_dir);
+
+		this.ready = true;
+	}
+}
\ No newline at end of file
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