MatrixChat: Move the event indexing logic into separate modules.

src/EventIndexPeg.js

@@ -0,0 +1,74 @@
+/*
+Copyright 2019 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+/*
+ * Holds the current Platform object used by the code to do anything
+ * specific to the platform we're running on (eg. web, electron)
+ * Platforms are provided by the app layer.
+ * This allows the app layer to set a Platform without necessarily
+ * having to have a MatrixChat object
+ */
+
+import PlatformPeg from "./PlatformPeg";
+import EventIndex from "./EventIndexing";
+import MatrixClientPeg from "./MatrixClientPeg";
+
+class EventIndexPeg {
+    constructor() {
+        this.index = null;
+    }
+
+    /**
+     * Returns the current Event index object for the application. Can be null
+     * if the platform doesn't support event indexing.
+     */
+    get() {
+        return this.index;
+    }
+
+    /** Create a new EventIndex and initialize it if the platform supports it.
+     * Returns true if an EventIndex was successfully initialized, false
+     * otherwise.
+     */
+    async init() {
+        const platform = PlatformPeg.get();
+        if (!platform.supportsEventIndexing()) return false;
+
+        let index = new EventIndex();
+
+        const userId = MatrixClientPeg.get().getUserId();
+        // TODO log errors here and return false if it errors out.
+        await index.init(userId);
+        this.index = index;
+
+        return true
+    }
+
+    async stop() {
+        if (this.index == null) return;
+        index.stopCrawler();
+    }
+
+    async deleteEventIndex() {
+        if (this.index == null) return;
+        index.deleteEventIndex();
+    }
+}
+
+if (!global.mxEventIndexPeg) {
+    global.mxEventIndexPeg = new EventIndexPeg();
+}
+module.exports = global.mxEventIndexPeg;