server.js

const express = require("express");
const mongoose = require("mongoose");
const bodyParser = require("body-parser");
const passport = require("passport");

const users = require("./routes/api/users");
const tree = require("./routes/api/hobbyTree");
const set = require("./routes/api/set");
const moment = require("moment");
const Post = require("./models/Post");
const { setIntervalAsync } = require("set-interval-async/dynamic");
const init_db = require("./db").init_db;
const get_db = require("./db").get_db;

const app = express();

// Bodyparser middleware
app.use(
  bodyParser.urlencoded({
    extended: true,
  })
);
app.use(bodyParser.json());

const port = process.env.PORT || 5000;

//initialize db connection
init_db(function (err) {
  if (err) throw err;
  app.listen(port, () =>
    console.log(`Server up and running on port ${port} !`)
  );
  const post = require("./routes/api/post");

  // Routes
  app.use("/api/users", users);
  app.use("/api/tree", tree);
  app.use("/api/post", post);
  app.use("/api/set", set);
});

// Passport middleware
app.use(passport.initialize());
app.use(passport.session());

// Passport config
require("./config/passport")(passport);

the_interval = 5 * 60 * 1000;
setIntervalAsync(hRankUpdatePosts, the_interval);
setIntervalAsync(hRankUpdateComments, the_interval);

async function hRankUpdateComments() {
  console.log("commup");

  Comment.find().then((comments) => {
    return new Promise((resolve, reject) => {
      comments.map((comment, i) => {
        if (comment.hRank > 0.001) {
          var timeDiff = (moment() - comment.date) / 3600000;
          var x = 0.8 + 0.2 * (1 / (1 + Math.log((timeDiff ^ 2) + 2)));
          comment.hRank = Number(comment.hRank * x);
          comment.save();
        }
        if (i == comments.length) {
          resolve();
        }
      });
    });
  });
}
async function hRankUpdatePosts() {
  console.log("postup");
  Post.find().then((posts) => {
    return new Promise((resolve, reject) => {
      posts.map((post, i) => {
        if (post.hRank > 0.001) {
          var timeDiff = (moment() - post.date) / 3600000;
          var x = 0.8 + 0.2 * (1 / (1 + Math.log((timeDiff ^ 2) + 2)));
          post.hRank = Number(post.hRank * x);
          post.save();
        }
        if (i == posts.length) {
          resolve();
        }
      });
    });
  });
}