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// Implementation inspired from Outline
import type { QueueClient } from "./queueing";
import logger from "./logger";
import { SearchIndexClient } from "./search";
export enum PluginType {
Search = "search",
Queue = "queue",
}
interface PluginTypeMap {
[PluginType.Search]: SearchIndexClient;
[PluginType.Queue]: QueueClient;
}
export interface TPlugin<T extends PluginType> {
type: T;
name: string;
provider: PluginProvider<PluginTypeMap[T]>;
}
export interface PluginProvider<T> {
getClient(): Promise<T | null>;
}
// Preserve the key-dependent value type: for K, store TPlugin<K>[]
type ProviderMap = { [K in PluginType]: TPlugin<K>[] };
export class PluginManager {
private static providers: ProviderMap = {
[PluginType.Search]: [],
[PluginType.Queue]: [],
};
static register<T extends PluginType>(plugin: TPlugin<T>): void {
PluginManager.providers[plugin.type].push(plugin);
}
static async getClient<T extends PluginType>(
type: T,
): Promise<PluginTypeMap[T] | null> {
const providers: TPlugin<T>[] = PluginManager.providers[type];
if (providers.length === 0) {
return null;
}
return await providers[providers.length - 1]!.provider.getClient();
}
static isRegistered<T extends PluginType>(type: T): boolean {
return PluginManager.providers[type].length > 0;
}
static getPluginName<T extends PluginType>(type: T): string | null {
const providers: TPlugin<T>[] = PluginManager.providers[type];
if (providers.length === 0) {
return null;
}
return providers[providers.length - 1]!.name;
}
static logAllPlugins() {
logger.info("Plugins (Last one wins):");
for (const type of Object.values(PluginType)) {
logger.info(` ${type}:`);
const plugins = PluginManager.providers[type];
if (!plugins) {
logger.info(" - None");
continue;
}
for (const plugin of plugins) {
logger.info(` - ${plugin.name}`);
}
}
}
}
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