Switched from setTimeout to crontab for watch-mode.

config/default.js

@@ -46,8 +46,7 @@ module.exports = {
         avoidDuplicates: true,
         retries: 3,
         watch: {
-            interval: 30,
+            schedule: '*/30 * * * *',
-            ignoreErrors: true,
         },
         archives: {
             search: false,

package-lock.json

@@ -1523,6 +1523,11 @@
       "integrity": "sha1-Sr6/7tdUHywnrPspvbvRXI1bpPc=",
       "dev": true
     },
+    "node-cron": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/node-cron/-/node-cron-1.2.1.tgz",
+      "integrity": "sha1-jJC8XccjpWKJsHhmVatKHEy2A2g="
+    },
     "node-exiftool": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/node-exiftool/-/node-exiftool-2.3.0.tgz",

package.json

@@ -38,6 +38,7 @@
     "fs-extra": "^5.0.0",
     "js-yaml": "^3.12.0",
     "mime-types": "^2.1.18",
+    "node-cron": "^1.2.1",
     "node-exiftool": "^2.3.0",
     "node-fetch": "^2.1.2",
     "object.omit": "^3.0.0",

src/app.js

@@ -4,6 +4,7 @@ const config = require('config');
 const Snoowrap = require('snoowrap');
 const exiftool = require('node-exiftool');
 const exiftoolBin = require('dist-exiftool');
+const cron = require('node-cron');
 const { format } = require('date-fns');
 
 require('array.prototype.flatten').shim();
@@ -40,12 +41,6 @@ function fetchSavePosts(userPosts, ep) {
 }
 
 async function initApp() {
-    function watch() {
-        console.log(`[${format(new Date(), 'YYYY-MM-DD HH:mm:ss')}] Watch-mode enabled, checking for new posts ${config.fetch.watch.interval} minutes from now.`);
-
-        setTimeout(initApp, Math.ceil(config.fetch.watch.interval) * 1000 * 60);
-    }
-
     const usersProvided = args.users && args.users.length;
     const postIdsProvided = args.posts && args.posts.length;
 
@@ -62,17 +57,17 @@ async function initApp() {
         await ep.close();
 
         if (args.watch) {
-            watch();
+            console.log(`[${format(new Date(), 'YYYY-MM-DD HH:mm:ss')}] Watch-mode enabled, checking again for new posts according to crontab '${config.fetch.watch.schedule}'.`);
         }
     } catch (error) {
         console.error(error);
-
-        if (args.watch && config.fetch.watch.ignoreErrors) {
-            watch();
-        }
     }
 
     return true;
 }
 
 initApp();
+
+if (args.watch) {
+    cron.schedule(config.fetch.watch.schedule, initApp);
+}