import { AbstractFactory, Container, DependencyRequirement, PropertyDependency, isInstantiable, DEPENDENCY_KEYS_METADATA_KEY, DEPENDENCY_KEYS_PROPERTY_METADATA_KEY } from "@extollo/di" import {Collection, ErrorWithContext} from "@extollo/util" import {Logging} from "../../service/Logging"; import {Config} from "../../service/Config"; import {Cache} from "./Cache" import {MemoryCache} from "./MemoryCache"; export class CacheFactory extends AbstractFactory { protected readonly logging: Logging protected readonly config: Config private static loggedMemoryCacheWarningOnce = false constructor() { super({}) this.logging = Container.getContainer().make(Logging) this.config = Container.getContainer().make(Config) } produce(dependencies: any[], parameters: any[]): Cache { return new (this.getCacheClass()) } match(something: any) { return something === Cache } getDependencyKeys(): Collection { const meta = Reflect.getMetadata(DEPENDENCY_KEYS_METADATA_KEY, this.getCacheClass()) if ( meta ) return meta return new Collection() } getInjectedProperties(): Collection { const meta = new Collection() let currentToken = this.getCacheClass() do { const loadedMeta = Reflect.getMetadata(DEPENDENCY_KEYS_PROPERTY_METADATA_KEY, currentToken) if ( loadedMeta ) meta.concat(loadedMeta) currentToken = Object.getPrototypeOf(currentToken) } while (Object.getPrototypeOf(currentToken) !== Function.prototype && Object.getPrototypeOf(currentToken) !== Object.prototype) return meta } protected getCacheClass() { const CacheClass = this.config.get('server.cache.driver', MemoryCache) if ( CacheClass === MemoryCache && !CacheFactory.loggedMemoryCacheWarningOnce ) { this.logging.warn(`You are using the default memory-based cache driver. It is recommended you configure a persistent cache driver instead.`) CacheFactory.loggedMemoryCacheWarningOnce = true } if ( !isInstantiable(CacheClass) || !(CacheClass.prototype instanceof Cache) ) { const e = new ErrorWithContext('Provided session class does not extend from @extollo/lib.Cache'); e.context = { config_key: 'server.cache.driver', class: CacheClass.toString(), } } return CacheClass } }