Faster activity load through concurrency.

git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4445 ed5197a5-7fde-0310-b194-c3ffbd925b24

apps/gg/script.js

@@ -63,6 +63,24 @@ class GgAppElement extends LitElement {
 		await this.get_activities_from_ssb();
 	}
 
+	/* https://gist.github.com/jcouyang/632709f30e12a7879a73e9e132c0d56b?permalink_comment_id=3591045#gistcomment-3591045 */
+	async promise_all(promises, max_concurrent) {
+		let index = 0;
+		let results = [];
+		async function exec_thread() {
+			while (index < promises.length) {
+				const current = index++;
+				results[current] = await promises[current];
+			}
+		}
+		const threads = [];
+		for (let thread = 0; thread < max_concurrent; thread++) {
+			threads.push(exec_thread());
+		}
+		await Promise.all(threads);
+		return results;
+	}
+
 	async get_activities_from_ssb() {
 		this.status = {text: 'loading activities'};
 		this.loaded_activities = [];
@@ -75,9 +93,10 @@ class GgAppElement extends LitElement {
 			json_extract(mention.value, '$.name') = 'activity_data'
 			ORDER BY messages.timestamp DESC
 		`, []);
-		for (let [index, row] of blob_ids.entries()) {
-			this.status = {text: 'loading activity data', value: index, max: blob_ids.length};
-			let blob = await tfrpc.rpc.get_blob(row.blob_id);
+		this.status = {text: 'loading activity data'};
+		let blobs = await this.promise_all(blob_ids.map(x => tfrpc.rpc.get_blob(x.blob_id)), 8);
+		this.status = {text: 'processing activity data'};
+		for (let blob of blobs) {
 			try {
 				this.loaded_activities.push(JSON.parse(blob));
 			} catch {