with cronjob for regular user checking

package.json

@@ -16,6 +16,7 @@
     "@types/react-router-dom": "^5.1.9",
     "bootstrap": "4.5.3",
     "classnames": "^2.2.6",
+    "cron": "^1.8.2",
     "markdown-to-jsx": "^7.1.3",
     "react": "^17.0.1",
     "react-bootstrap": "^1.5.2",
@@ -58,6 +59,7 @@
   },
   "devDependencies": {
     "@babel/plugin-transform-react-jsx": "^7.14.5",
+    "@types/cron": "^1.7.3",
     "mdx-loader": "^3.0.2",
     "node-fetch": "^2.6.1"
   }

src/user-context.tsx

@@ -1,5 +1,6 @@
 import React, { useState, createContext, useEffect } from "react"
 import { AT, getUser } from "@lingdocs/lingdocs-main";
+import { CronJob } from "cron";
 
 const UserContext = createContext<
   {
@@ -10,17 +11,28 @@ const UserContext = createContext<
   | undefined
 >(undefined);
 
+// TODO: persisting user in local state
 function UserProvider({ children }: any) {
   const [user, setUser] = useState<AT.LingdocsUser | undefined>(undefined);
 
   function pullUser() {
+    console.log("pulling user...");
     getUser().then((user) => {
       setUser(user === "offline" ? undefined : user);
     }).catch(console.error);
   }
 
+  const checkUserCronJob = new CronJob("1/30 * * * * *", () => {
+    pullUser();
+  });
+
   useEffect(() => {
     pullUser();
+    checkUserCronJob.start();
+    return () => {
+      checkUserCronJob.stop();
+    }
+    // eslint-disable-next-line
   }, []);
 
   return <UserContext.Provider value={{ user, setUser, pullUser }}>

yarn.lock

@@ -1890,6 +1890,14 @@
   resolved "https://registry.yarnpkg.com/@types/color-name/-/color-name-1.1.1.tgz#1c1261bbeaa10a8055bbc5d8ab84b7b2afc846a0"
   integrity sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==
 
+"@types/cron@^1.7.3":
+  version "1.7.3"
+  resolved "https://registry.yarnpkg.com/@types/cron/-/cron-1.7.3.tgz#993db7d54646f61128c851607b64ba4495deae93"
+  integrity sha512-iPmUXyIJG1Js+ldPYhOQcYU3kCAQ2FWrSkm1FJPoii2eYSn6wEW6onPukNTT0bfiflexNSRPl6KWmAIqS+36YA==
+  dependencies:
+    "@types/node" "*"
+    moment ">=2.14.0"
+
 "@types/eslint-visitor-keys@^1.0.0":
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/@types/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz#1ee30d79544ca84d68d4b3cdb0af4f205663dd2d"
@@ -3889,6 +3897,13 @@ create-hmac@^1.1.0, create-hmac@^1.1.2, create-hmac@^1.1.4:
     safe-buffer "^5.0.1"
     sha.js "^2.4.8"
 
+cron@^1.8.2:
+  version "1.8.2"
+  resolved "https://registry.yarnpkg.com/cron/-/cron-1.8.2.tgz#4ac5e3c55ba8c163d84f3407bde94632da8370ce"
+  integrity sha512-Gk2c4y6xKEO8FSAUTklqtfSr7oTq0CiPQeLBG5Fl0qoXpZyMcj1SG59YL+hqq04bu6/IuEA7lMkYDAplQNKkyg==
+  dependencies:
+    moment-timezone "^0.5.x"
+
 cross-spawn@7.0.1:
   version "7.0.1"
   resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-7.0.1.tgz#0ab56286e0f7c24e153d04cc2aa027e43a9a5d14"
@@ -7938,6 +7953,18 @@ mkdirp@^0.5.5:
   dependencies:
     minimist "^1.2.5"
 
+moment-timezone@^0.5.x:
+  version "0.5.33"
+  resolved "https://registry.yarnpkg.com/moment-timezone/-/moment-timezone-0.5.33.tgz#b252fd6bb57f341c9b59a5ab61a8e51a73bbd22c"
+  integrity sha512-PTc2vcT8K9J5/9rDEPe5czSIKgLoGsH8UNpA4qZTVw0Vd/Uz19geE9abbIOQKaAQFcnQ3v5YEXrbSc5BpshH+w==
+  dependencies:
+    moment ">= 2.9.0"
+
+"moment@>= 2.9.0", moment@>=2.14.0:
+  version "2.29.1"
+  resolved "https://registry.yarnpkg.com/moment/-/moment-2.29.1.tgz#b2be769fa31940be9eeea6469c075e35006fa3d3"
+  integrity sha512-kHmoybcPV8Sqy59DwNDY3Jefr64lK/by/da0ViFcuA4DH0vQg5Q6Ze5VimxkfQNSC+Mls/Kx53s7TjP1RhFEDQ==
+
 move-concurrently@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/move-concurrently/-/move-concurrently-1.0.1.tgz#be2c005fda32e0b29af1f05d7c4b33214c701f92"