feat: Add idle detection and disconnect collaboration socket (#2629)

app/hooks/useIdle.js

@@ -0,0 +1,54 @@
+// @flow
+import * as React from "react";
+
+const activityEvents = [
+  "click",
+  "mousemove",
+  "keydown",
+  "DOMMouseScroll",
+  "mousewheel",
+  "mousedown",
+  "touchstart",
+  "touchmove",
+  "focus",
+];
+
+/**
+ * Hook to detect user idle state.
+ *
+ * @param {number} timeToIdle
+ * @returns boolean if the user is idle
+ */
+export default function useIdle(timeToIdle: number = 3 * 60 * 1000) {
+  const [isIdle, setIsIdle] = React.useState(false);
+  const timeout = React.useRef();
+
+  const onActivity = React.useCallback(() => {
+    if (timeout.current) {
+      clearTimeout(timeout.current);
+    }
+
+    timeout.current = setTimeout(() => {
+      setIsIdle(true);
+    }, timeToIdle);
+  }, [timeToIdle]);
+
+  React.useEffect(() => {
+    const handleUserActivityEvent = () => {
+      setIsIdle(false);
+      onActivity();
+    };
+
+    activityEvents.forEach((eventName) =>
+      window.addEventListener(eventName, handleUserActivityEvent)
+    );
+
+    return () => {
+      activityEvents.forEach((eventName) =>
+        window.removeEventListener(eventName, handleUserActivityEvent)
+      );
+    };
+  }, [onActivity]);
+
+  return isIdle;
+}

app/hooks/usePageVisibility.js

@@ -0,0 +1,22 @@
+// @flow
+import * as React from "react";
+
+/**
+ * Hook to return page visibility state.
+ *
+ * @returns boolean if the page is visible
+ */
+export default function usePageVisibility(): boolean {
+  const [visible, setVisible] = React.useState(true);
+
+  React.useEffect(() => {
+    const handleVisibilityChange = () => setVisible(!document.hidden);
+    document.addEventListener("visibilitychange", handleVisibilityChange);
+
+    return () => {
+      document.removeEventListener("visibilitychange", handleVisibilityChange);
+    };
+  }, []);
+
+  return visible;
+}

app/scenes/Document/components/MultiplayerEditor.js

@@ -1,5 +1,5 @@
 // @flow
-import { HocuspocusProvider } from "@hocuspocus/provider";
+import { HocuspocusProvider, WebSocketStatus } from "@hocuspocus/provider";
 import * as React from "react";
 import { useTranslation } from "react-i18next";
 import { useHistory } from "react-router";
@@ -9,9 +9,10 @@ import Editor, { type Props as EditorProps } from "components/Editor";
 import env from "env";
 import useCurrentToken from "hooks/useCurrentToken";
 import useCurrentUser from "hooks/useCurrentUser";
+import useIdle from "hooks/useIdle";
+import usePageVisibility from "hooks/usePageVisibility";
 import useStores from "hooks/useStores";
 import useToasts from "hooks/useToasts";
-import useUnmount from "hooks/useUnmount";
 import MultiplayerExtension from "multiplayer/MultiplayerExtension";
 import { homeUrl } from "utils/routeHelpers";
 
@@ -27,12 +28,13 @@ function MultiplayerEditor({ ...props }: Props, ref: any) {
   const currentUser = useCurrentUser();
   const { presence, ui } = useStores();
   const token = useCurrentToken();
-  const [localProvider, setLocalProvider] = React.useState();
   const [remoteProvider, setRemoteProvider] = React.useState();
   const [isLocalSynced, setLocalSynced] = React.useState(false);
   const [isRemoteSynced, setRemoteSynced] = React.useState(false);
   const [ydoc] = React.useState(() => new Y.Doc());
   const { showToast } = useToasts();
+  const isIdle = useIdle();
+  const isVisible = usePageVisibility();
 
   // Provider initialization must be within useLayoutEffect rather than useState
   // or useMemo as both of these are ran twice in React StrictMode resulting in
@@ -91,7 +93,15 @@ function MultiplayerEditor({ ...props }: Props, ref: any) {
     provider.on("status", (ev) => ui.setMultiplayerStatus(ev.status));
 
     setRemoteProvider(provider);
-    setLocalProvider(localProvider);
+
+    return () => {
+      provider?.destroy();
+      localProvider?.destroy();
+
+      setRemoteProvider(null);
+
+      ui.setMultiplayerStatus(undefined);
+    };
   }, [history, showToast, t, documentId, ui, presence, token, ydoc]);
 
   const user = React.useMemo(() => {
@@ -116,11 +126,26 @@ function MultiplayerEditor({ ...props }: Props, ref: any) {
     ];
   }, [remoteProvider, user, ydoc]);
 
-  useUnmount(() => {
-    remoteProvider?.destroy();
-    localProvider?.destroy();
-    ui.setMultiplayerStatus(undefined);
-  });
+  // Disconnect the realtime connection while idle. `isIdle` also checks for
+  // page visibility and will immediately disconnect when a tab is hidden.
+  React.useEffect(() => {
+    if (!remoteProvider) {
+      return;
+    }
+    if (
+      isIdle &&
+      !isVisible &&
+      remoteProvider.status === WebSocketStatus.Connected
+    ) {
+      remoteProvider.disconnect();
+    }
+    if (
+      (!isIdle || isVisible) &&
+      remoteProvider.status === WebSocketStatus.Disconnected
+    ) {
+      remoteProvider.connect();
+    }
+  }, [remoteProvider, isIdle, isVisible]);
 
   if (!extensions.length) {
     return null;

package.json

@@ -48,7 +48,7 @@
     "@babel/preset-react": "^7.10.4",
     "@bull-board/api": "^3.5.0",
     "@bull-board/koa": "^3.5.0",
-    "@hocuspocus/provider": "^1.0.0-alpha.16",
+    "@hocuspocus/provider": "^1.0.0-alpha.18",
     "@hocuspocus/server": "^1.0.0-alpha.73",
     "@outlinewiki/koa-passport": "^4.1.4",
     "@outlinewiki/passport-azure-ad-oauth2": "^0.1.0",

shared/i18n/locales/en_US/translation.json

@@ -510,7 +510,7 @@
   "Upload": "Upload",
   "Subdomain": "Subdomain",
   "Your knowledge base will be accessible at": "Your knowledge base will be accessible at",
-  "Manage optional and beta features.": "Manage optional and beta features.",
+  "Manage optional and beta features. Changing these settings will affect all team members.": "Manage optional and beta features. Changing these settings will affect all team members.",
   "Collaborative editing": "Collaborative editing",
   "New group": "New group",
   "Groups can be used to organize and manage the people on your team.": "Groups can be used to organize and manage the people on your team.",

yarn.lock

@@ -1155,10 +1155,10 @@
   dependencies:
     "@hapi/hoek" "^8.3.0"
 
-"@hocuspocus/provider@^1.0.0-alpha.16":
-  version "1.0.0-alpha.16"
-  resolved "https://registry.yarnpkg.com/@hocuspocus/provider/-/provider-1.0.0-alpha.16.tgz#f14e10a6961a377564aabb8a6d443b8b512fa49d"
-  integrity sha512-kp3oteq64ruUAVXcEW4HlLlg2yZtZSxLN9/JMGaCERFRm+D+cvzJNadNh35mbO5a2Me612wj7lSV/OEw0ugQAw==
+"@hocuspocus/provider@^1.0.0-alpha.18":
+  version "1.0.0-alpha.18"
+  resolved "https://registry.yarnpkg.com/@hocuspocus/provider/-/provider-1.0.0-alpha.18.tgz#670b052a2bd8b634e05ec282f4453bfd92779906"
+  integrity sha512-KLszadquMZHKTdR9CQhAn97Gcn6TED6DKPpJ+9Ni68gCOfYUSZrI4pwIeOOgskYXAE/pI3Gfb0qW/OBMhKdT1w==
   dependencies:
     "@lifeomic/attempt" "^3.0.0"
     lib0 "^0.2.42"