EventIndexing: Rework the index initialization and deletion.

src/BaseEventIndexManager.js

@@ -206,6 +206,16 @@ export default class BaseEventIndexManager {
         throw new Error("Unimplemented");
     }
 
+    /**
+     * close our event index.
+     *
+     * @return {Promise} A promise that will resolve once the event index has
+     * been closed.
+     */
+    async closeEventIndex(): Promise<> {
+        throw new Error("Unimplemented");
+    }
+
     /**
      * Delete our current event index.
      *

src/EventIndexPeg.js

@@ -31,15 +31,6 @@ class EventIndexPeg {
         this.index = null;
     }
 
-    /**
-     * Get the current event index.
-     *
-     * @return {EventIndex} The current event index.
-     */
-    get() {
-        return this.index;
-    }
-
     /** Create a new EventIndex and initialize it if the platform supports it.
      *
      * @return {Promise<bool>} A promise that will resolve to true if an
@@ -72,11 +63,30 @@ class EventIndexPeg {
     }
 
     /**
-     * Stop our event indexer.
+     * Get the current event index.
+     *
+     * @return {EventIndex} The current event index.
      */
+    get() {
+        return this.index;
+    }
+
     stop() {
         if (this.index === null) return;
-        this.index.stop();
+        this.index.stopCrawler();
+    }
+
+    /**
+     * Unset our event store
+     *
+     * After a call to this the init() method will need to be called again.
+     *
+     * @return {Promise} A promise that will resolve once the event index is
+     * closed.
+     */
+    async unset() {
+        if (this.index === null) return;
+        this.index.close();
         this.index = null;
     }
 
@@ -89,10 +99,15 @@ class EventIndexPeg {
      * deleted.
      */
     async deleteEventIndex() {
-        if (this.index === null) return;
-        this.index.deleteEventIndex();
+        const indexManager = PlatformPeg.get().getEventIndexingManager();
+
+        if (indexManager !== null) {
+            this.stop();
+            console.log("EventIndex: Deleting event index.");
+            await indexManager.deleteEventIndex();
             this.index = null;
         }
+    }
 }
 
 if (!global.mxEventIndexPeg) {

src/EventIndexing.js

@@ -35,9 +35,7 @@ export default class EventIndexer {
 
     async init() {
         const indexManager = PlatformPeg.get().getEventIndexingManager();
-        if (indexManager === null) return false;
-        indexManager.initEventIndex();
-        return true;
+        return indexManager.initEventIndex();
     }
 
     async onSync(state, prevState, data) {
@@ -198,7 +196,6 @@ export default class EventIndexer {
             console.log("EventIndex: Running the crawler loop.");
 
             if (cancelled) {
-                console.log("EventIndex: Cancelling the crawler.");
                 break;
             }
 
@@ -373,26 +370,35 @@ export default class EventIndexer {
         this.crawlerCheckpoints.push(backwardsCheckpoint);
     }
 
+    startCrawler() {
+        if (this._crawlerRef !== null) return;
+
+        const crawlerHandle = {};
+        this.crawlerFunc(crawlerHandle);
+        this._crawlerRef = crawlerHandle;
+    }
+
+    stopCrawler() {
+        if (this._crawlerRef === null) return;
+
+        this._crawlerRef.cancel();
+        this._crawlerRef = null;
+    }
+
+    async close() {
+        const indexManager = PlatformPeg.get().getEventIndexingManager();
+        this.stopCrawler();
+        return indexManager.closeEventIndex();
+    }
+
     async deleteEventIndex() {
         const indexManager = PlatformPeg.get().getEventIndexingManager();
         if (indexManager !== null) {
-            console.log("EventIndex: Deleting event index.");
-            this.crawlerRef.cancel();
+            this.stopCrawler();
             await indexManager.deleteEventIndex();
         }
     }
 
-    startCrawler() {
-        const crawlerHandle = {};
-        this.crawlerFunc(crawlerHandle);
-        this.crawlerRef = crawlerHandle;
-    }
-
-    stop() {
-        this._crawlerRef.cancel();
-        this._crawlerRef = null;
-    }
-
     async search(searchArgs) {
         const indexManager = PlatformPeg.get().getEventIndexingManager();
         return indexManager.searchEventIndex(searchArgs);

src/Lifecycle.js

@@ -662,6 +662,7 @@ export function stopMatrixClient(unsetClient=true) {
 
         if (unsetClient) {
             MatrixClientPeg.unset();
+            EventIndexPeg.unset().done();
         }
     }
 }