stream_pill: Fetch all subscribers before getting user ids for a stream.

Work towards #34244.

web/src/add_group_members_pill.ts

@@ -1,8 +1,10 @@
+import $ from "jquery";
 import assert from "minimalistic-assert";
 
 import * as add_subscribers_pill from "./add_subscribers_pill.ts";
 import * as input_pill from "./input_pill.ts";
 import * as keydown_util from "./keydown_util.ts";
+import * as loading from "./loading.ts";
 import * as people from "./people.ts";
 import type {User} from "./people.ts";
 import * as stream_pill from "./stream_pill.ts";
@@ -13,9 +15,9 @@ import * as user_groups from "./user_groups.ts";
 import type {UserGroup} from "./user_groups.ts";
 import * as user_pill from "./user_pill.ts";
 
-function get_pill_user_ids(pill_widget: CombinedPillContainer): number[] {
+async function get_pill_user_ids(pill_widget: CombinedPillContainer): Promise<number[]> {
     const user_ids = user_pill.get_user_ids(pill_widget);
-    const stream_user_ids = stream_pill.get_user_ids(pill_widget);
+    const stream_user_ids = await stream_pill.get_user_ids(pill_widget);
     return [...user_ids, ...stream_user_ids];
 }
 
@@ -108,14 +110,22 @@ export function create({
 
     if (onPillCreateAction) {
         pill_widget.onPillCreate(() => {
-            onPillCreateAction(get_pill_user_ids(pill_widget), get_pill_group_ids(pill_widget));
+            void (async () => {
+                loading.make_indicator($(".add-group-member-loading-spinner"), {
+                    height: 56, // 4em at 14px / 1em
+                });
+                const user_ids = await get_pill_user_ids(pill_widget);
+                onPillCreateAction(user_ids, get_pill_group_ids(pill_widget));
+                loading.destroy_indicator($(".add-group-member-loading-spinner"));
+            })();
         });
     }
 
     if (onPillRemoveAction) {
-        pill_widget.onPillRemove(() => {
+        void (async () => {
-            onPillRemoveAction(get_pill_user_ids(pill_widget), get_pill_group_ids(pill_widget));
+            const user_ids = await get_pill_user_ids(pill_widget);
-        });
+            onPillRemoveAction(user_ids, get_pill_group_ids(pill_widget));
+        })();
     }
 
     function get_users(): User[] {
@@ -175,9 +185,23 @@ export function set_up_handlers({
     */
     function callback(): void {
         const pill_widget = get_pill_widget();
-        const pill_user_ids = get_pill_user_ids(pill_widget);
+        void (async () => {
+            loading.make_indicator($(".add-group-member-loading-spinner"), {
+                height: 56, // 4em at 14px / 1em
+            });
+            const pill_user_ids = await get_pill_user_ids(pill_widget);
+            // If we're no longer in the same view after fetching
+            // subscriber data, don't update the UI. We don't need
+            // to destroy the loading spinner because the tab re-renders
+            // every time it opens, and also there might be a new tab
+            // with a current loading spinner.
+            if (get_pill_widget() !== pill_widget) {
+                return;
+            }
+            loading.destroy_indicator($(".add-group-member-loading-spinner"));
             const pill_group_ids = get_pill_group_ids(pill_widget);
             action({pill_user_ids, pill_group_ids});
+        })();
     }
 
     $parent_container.on("keyup", pill_selector, (e) => {

web/src/add_subscribers_pill.ts

@@ -1,8 +1,10 @@
+import $ from "jquery";
 import assert from "minimalistic-assert";
 
 import * as blueslip from "./blueslip.ts";
 import * as input_pill from "./input_pill.ts";
 import * as keydown_util from "./keydown_util.ts";
+import * as loading from "./loading.ts";
 import type {User} from "./people.ts";
 import * as pill_typeahead from "./pill_typeahead.ts";
 import * as stream_pill from "./stream_pill.ts";
@@ -151,13 +153,23 @@ export function create({
 
     if (onPillCreateAction) {
         pill_widget.onPillCreate(() => {
-            onPillCreateAction(get_pill_user_ids(pill_widget));
+            void (async () => {
+                loading.make_indicator($(".add-subscriber-loading-spinner"), {
+                    height: 56, // 4em at 14px / 1em
+                });
+                const user_ids = await get_pill_user_ids(pill_widget);
+                onPillCreateAction(user_ids);
+                loading.destroy_indicator($(".add-subscriber-loading-spinner"));
+            })();
         });
     }
 
     if (onPillRemoveAction) {
         pill_widget.onPillRemove(() => {
-            onPillRemoveAction(get_pill_user_ids(pill_widget));
+            void (async () => {
+                const user_ids = await get_pill_user_ids(pill_widget);
+                onPillRemoveAction(user_ids);
+            })();
         });
     }
 
@@ -202,9 +214,9 @@ export function append_user_group_from_name(
     user_group_pill.append_user_group(user_group, pill_widget);
 }
 
-function get_pill_user_ids(pill_widget: CombinedPillContainer): number[] {
+async function get_pill_user_ids(pill_widget: CombinedPillContainer): Promise<number[]> {
     const user_ids = user_pill.get_user_ids(pill_widget);
-    const stream_user_ids = stream_pill.get_user_ids(pill_widget);
+    const stream_user_ids = await stream_pill.get_user_ids(pill_widget);
     const group_user_ids = user_group_pill.get_user_ids(pill_widget);
     return [...user_ids, ...stream_user_ids, ...group_user_ids];
 }
@@ -251,8 +263,22 @@ export function set_up_handlers({
     */
     function callback(): void {
         const pill_widget = get_pill_widget();
-        const pill_user_ids = get_pill_user_ids(pill_widget);
+        void (async () => {
+            loading.make_indicator($(".add-subscriber-loading-spinner"), {
+                height: 56, // 4em at 14px / 1em
+            });
+            const pill_user_ids = await get_pill_user_ids(pill_widget);
+            // If we're no longer in the same view after fetching
+            // subscriber data, don't update the UI. We don't need
+            // to destroy the loading spinner because the tab re-renders
+            // every time it opens, and also there might be a new tab
+            // with a current loading spinner.
+            if (get_pill_widget() !== pill_widget) {
+                return;
+            }
+            loading.destroy_indicator($(".add-subscriber-loading-spinner"));
             action({pill_user_ids});
+        })();
     }
 
     $parent_container.on("keyup", pill_selector, (e) => {

web/src/stream_pill.ts

@@ -60,12 +60,25 @@ export function get_stream_name_from_item(item: StreamPill): string {
     return stream.name;
 }
 
-export function get_user_ids(pill_widget: StreamPillWidget | CombinedPillContainer): number[] {
+export async function get_user_ids(
-    let user_ids = pill_widget
+    pill_widget: StreamPillWidget | CombinedPillContainer,
-        .items()
+): Promise<number[]> {
-        .flatMap((item) =>
+    const stream_ids = get_stream_ids(pill_widget);
-            item.type === "stream" ? peer_data.get_subscribers(item.stream_id) : [],
+    const results = await Promise.all(
+        stream_ids.map(async (stream_id) => peer_data.get_all_subscribers(stream_id, true)),
     );
+
+    const current_stream_ids_in_widget = get_stream_ids(pill_widget);
+    let user_ids: number[] = [];
+    for (const [index, stream_id] of stream_ids.entries()) {
+        const subscribers = results[index]!;
+        // Double check if the stream pill has been removed from the pill
+        // widget while we were doing fetches.
+        if (current_stream_ids_in_widget.includes(stream_id)) {
+            user_ids = [...user_ids, ...subscribers];
+        }
+    }
+
     user_ids = [...new Set(user_ids)];
     user_ids.sort((a, b) => a - b);
     return user_ids;

web/styles/subscriptions.css

@@ -147,6 +147,19 @@ h4.user_group_setting_subsection_title {
     margin-top: 100px;
 }
 
+#people_to_add_in_group,
+#people_to_add,
+.member_list_settings_container,
+.subscriber_list_settings_container {
+    display: flex;
+    flex-direction: column;
+}
+
+.add-group-member-loading-spinner,
+.add-subscriber-loading-spinner {
+    align-self: center;
+}
+
 .member-list-box,
 .subscriber-list-box {
     text-align: center;

web/templates/stream_settings/new_stream_users.hbs

@@ -11,6 +11,8 @@
       autocomplete="off" placeholder="{{t 'Filter' }}" />
 </div>
 
+<div class="add-subscriber-loading-spinner"></div>
+
 <div class="subscriber-list-box">
     <div class="subscriber_list_container" data-simplebar data-simplebar-tab-index="-1">
         <table class="subscriber-list table table-striped">

web/templates/stream_settings/stream_members.hbs

@@ -16,6 +16,7 @@
             <input type="text" class="search filter_text_input" placeholder="{{t 'Filter' }}" />
         </span>
     </div>
+    <div class="add-subscriber-loading-spinner"></div>
     <div class="subscriber-list-box">
         {{> stream_members_table .}}
     </div>

web/templates/user_group_settings/new_user_group_users.hbs

@@ -9,6 +9,8 @@
       autocomplete="off" placeholder="{{t 'Filter' }}" />
 </div>
 
+<div class="add-group-member-loading-spinner"></div>
+
 <div class="member-list-box">
     <div class="member_list_container" data-simplebar data-simplebar-tab-index="-1">
         <table class="member-list table table-striped">

web/templates/user_group_settings/user_group_members.hbs

@@ -18,6 +18,7 @@
             <input type="text" class="search filter_text_input" placeholder="{{t 'Filter' }}" />
         </span>
     </div>
+    <div class="add-group-member-loading-spinner"></div>
     <div class="member-list-box">
         {{> user_group_members_table .}}
     </div>

web/tests/stream_pill.test.cjs

@@ -132,11 +132,11 @@ run_test("get_stream_id", () => {
     assert.equal(stream_pill.get_stream_name_from_item(denmark_pill), denmark.name);
 });
 
-run_test("get_user_ids", () => {
+run_test("get_user_ids", async () => {
     const items = [denmark_pill, sweden_pill];
     const widget = {items: () => items};
 
-    const user_ids = stream_pill.get_user_ids(widget);
+    const user_ids = await stream_pill.get_user_ids(widget);
     assert.deepEqual(user_ids, [1, 2, 3, 4, 5, 77]);
 });