BaseEventIndexManager: Add a method to load file events of a room.

src/indexing/BaseEventIndexManager.js

@@ -62,11 +62,18 @@ export interface SearchArgs {
     room_id: ?string;
 }
 
-export interface HistoricEvent {
+export interface EventAndProfile {
     event: MatrixEvent;
     profile: MatrixProfile;
 }
 
+export interface LoadArgs {
+    roomId: string;
+    limit: number;
+    fromEvent: string;
+    direction: string;
+}
+
 /**
  * Base class for classes that provide platform-specific event indexing.
  *
@@ -145,7 +152,7 @@ export default class BaseEventIndexManager {
      *
      * This is used to add a batch of events to the index.
      *
-     * @param {[HistoricEvent]} events The list of events and profiles that
+     * @param {[EventAndProfile]} events The list of events and profiles that
      * should be added to the event index.
      * @param {[CrawlerCheckpoint]} checkpoint A new crawler checkpoint that
      * should be stored in the index which should be used to continue crawling
@@ -158,7 +165,7 @@ export default class BaseEventIndexManager {
      * were already added to the index, false otherwise.
      */
     async addHistoricEvents(
-        events: [HistoricEvent],
+        events: [EventAndProfile],
         checkpoint: CrawlerCheckpoint | null,
         oldCheckpoint: CrawlerCheckpoint | null,
     ): Promise<bool> {
@@ -201,6 +208,23 @@ export default class BaseEventIndexManager {
         throw new Error("Unimplemented");
     }
 
+    /** Load events that contain an mxc URL to a file from the index.
+     *
+     * @param  {object} args Arguments object for the method.
+     * @param  {string} args.roomId The ID of the room for which the events
+     * should be loaded.
+     * @param  {number} args.limit The maximum number of events to return.
+     * @param  {string} args.fromEvent An event id of a previous event returned
+     * by this method. If set events that are older than the event with the
+     * given event ID will be returned.
+     *
+     * @return {Promise<[EventAndProfile]>} A promise that will resolve to an array
+     * of Matrix events that contain mxc URLs.
+     */
+    async loadFileEvents(args: LoadArgs): Promise<[EventAndProfile]> {
+        throw new Error("Unimplemented");
+    }
+
     /**
      * close our event index.
      *