immich/server/src/interfaces/event.interface.ts

import { SystemConfig } from 'src/config';
import { AssetResponseDto } from 'src/dtos/asset-response.dto';
import { ReleaseNotification, ServerVersionResponseDto } from 'src/dtos/server.dto';

export const IEventRepository = 'IEventRepository';

type EmitEventMap = {
  // app events
  onBootstrap: ['api' | 'microservices'];
  onShutdown: [];

  // config events
  onConfigUpdate: [{ newConfig: SystemConfig; oldConfig: SystemConfig }];
  onConfigValidate: [{ newConfig: SystemConfig; oldConfig: SystemConfig }];

  // album events
  onAlbumUpdate: [{ id: string; updatedBy: string }];
  onAlbumInvite: [{ id: string; userId: string }];

  // user events
  onUserSignup: [{ notify: boolean; id: string; tempPassword?: string }];
};

export type EmitEvent = keyof EmitEventMap;
export type EmitHandler<T extends EmitEvent> = (...args: ArgsOf<T>) => Promise<void> | void;
export type ArgOf<T extends EmitEvent> = EmitEventMap[T][0];
export type ArgsOf<T extends EmitEvent> = EmitEventMap[T];

export enum ClientEvent {
  UPLOAD_SUCCESS = 'on_upload_success',
  USER_DELETE = 'on_user_delete',
  ASSET_DELETE = 'on_asset_delete',
  ASSET_TRASH = 'on_asset_trash',
  ASSET_UPDATE = 'on_asset_update',
  ASSET_HIDDEN = 'on_asset_hidden',
  ASSET_RESTORE = 'on_asset_restore',
  ASSET_STACK_UPDATE = 'on_asset_stack_update',
  PERSON_THUMBNAIL = 'on_person_thumbnail',
  SERVER_VERSION = 'on_server_version',
  CONFIG_UPDATE = 'on_config_update',
  NEW_RELEASE = 'on_new_release',
}

export interface ClientEventMap {
  [ClientEvent.UPLOAD_SUCCESS]: AssetResponseDto;
  [ClientEvent.USER_DELETE]: string;
  [ClientEvent.ASSET_DELETE]: string;
  [ClientEvent.ASSET_TRASH]: string[];
  [ClientEvent.ASSET_UPDATE]: AssetResponseDto;
  [ClientEvent.ASSET_HIDDEN]: string;
  [ClientEvent.ASSET_RESTORE]: string[];
  [ClientEvent.ASSET_STACK_UPDATE]: string[];
  [ClientEvent.PERSON_THUMBNAIL]: string;
  [ClientEvent.SERVER_VERSION]: ServerVersionResponseDto;
  [ClientEvent.CONFIG_UPDATE]: Record<string, never>;
  [ClientEvent.NEW_RELEASE]: ReleaseNotification;
}

export enum ServerEvent {
  CONFIG_UPDATE = 'config.update',
  WEBSOCKET_CONNECT = 'websocket.connect',
}

export interface ServerEventMap {
  [ServerEvent.CONFIG_UPDATE]: null;
  [ServerEvent.WEBSOCKET_CONNECT]: { userId: string };
}

export interface IEventRepository {
  on<T extends keyof EmitEventMap>(event: T, handler: EmitHandler<T>): void;
  emit<T extends keyof EmitEventMap>(event: T, ...args: ArgsOf<T>): Promise<void>;

  /**
   * Send to connected clients for a specific user
   */
  clientSend<E extends keyof ClientEventMap>(event: E, userId: string, data: ClientEventMap[E]): void;
  /**
   * Send to all connected clients
   */
  clientBroadcast<E extends keyof ClientEventMap>(event: E, data: ClientEventMap[E]): void;
  /**
   * Notify listeners in this and connected processes. Subscribe to an event with `@OnServerEvent`
   */
  serverSend<E extends keyof ServerEventMap>(event: E, data: ServerEventMap[E]): boolean;
}