feat: complete day 4

day4/cronjobs/email_queue.js

@@ -0,0 +1,56 @@
+const db = require("../models");
+const { Op } = require("sequelize");
+
+(async () => {
+  try {
+    const User = db.user;
+    const Email = db.email;
+    const EmailQueue = db.email_queue;
+
+    // 1. Get all active users
+    const users = await User.findAll({ where: { status: 1 } });
+    if (!users.length) {
+      console.log("No active users found.");
+      return;
+    }
+
+    // 2. Determine day and select emails
+    const today = new Date();
+    const day = today.getDay(); // 0=Sun, 1=Mon, ...
+    const isOddDay = day === 1 || day === 3 || day === 5; // Mon, Wed, Fri
+    const emailWhere = isOddDay
+      ? { id: { [Op.mod]: [2, 1] } } // odd ids
+      : { id: { [Op.mod]: [2, 0] } }; // even ids
+    const emails = await Email.findAll({ where: emailWhere });
+    if (!emails.length) {
+      console.log("No emails found for today.");
+      return;
+    }
+
+    // 3. For each user and email, insert into email_queue
+    const tomorrow = new Date(today);
+    tomorrow.setDate(today.getDate() + 1);
+    const sendAt = tomorrow;
+    let count = 0;
+    for (const user of users) {
+      for (const email of emails) {
+        await EmailQueue.create({
+          email_id: email.id,
+          user_id: user.id,
+          status: 0, // not sent
+          created_at: today,
+          send_at: sendAt,
+          updated_at: today,
+        });
+        count++;
+      }
+    }
+    console.log(
+      `Inserted ${count} email_queue records for ${users.length} users and ${emails.length} emails.`
+    );
+    process.exit(0);
+  } catch (err) {
+    console.error("Error in email_queue cronjob:", err);
+    process.exit(1);
+  }
+})();

day4/cronjobs/email_sending.js

@@ -0,0 +1,66 @@
+const db = require("../models");
+const nodemailer = require("nodemailer");
+require("dotenv").config();
+
+(async () => {
+  try {
+    const EmailQueue = db.email_queue;
+    const Email = db.email;
+    const User = db.user;
+    const today = new Date();
+    today.setHours(0, 0, 0, 0);
+    const tomorrow = new Date(today);
+    tomorrow.setDate(today.getDate() + 1);
+
+    // 1. Get all email_queue entries for today and not sent
+    const queues = await EmailQueue.findAll({
+      where: {
+        send_at: { $gte: today, $lt: tomorrow },
+        status: 0,
+      },
+    });
+    if (!queues.length) {
+      console.log("No emails to send today.");
+      return;
+    }
+
+    // 2. Setup nodemailer with Mailtrap
+    const transporter = nodemailer.createTransport({
+      host: process.env.MAILTRAP_HOST,
+      port: process.env.MAILTRAP_PORT,
+      auth: {
+        user: process.env.MAILTRAP_USER,
+        pass: process.env.MAILTRAP_PASS,
+      },
+    });
+
+    let sentCount = 0;
+    for (const queue of queues) {
+      // 3. Get user and email
+      const user = await User.findByPk(queue.user_id);
+      const email = await Email.findByPk(queue.email_id);
+      if (!user || !email) continue;
+      // 4. Replace template
+      let body = email.body
+        .replace(/\{\{\{NAME\}\}\}/g, user.name)
+        .replace(/\{\{\{EMAIL\}\}\}/g, user.email);
+      // 5. Send email
+      await transporter.sendMail({
+        from: "noreply@example.com",
+        to: user.email,
+        subject: email.subject,
+        html: body,
+      });
+      // 6. Mark as sent
+      queue.status = 1;
+      queue.updated_at = new Date();
+      await queue.save();
+      sentCount++;
+    }
+    console.log(`Sent ${sentCount} emails.`);
+    process.exit(0);
+  } catch (err) {
+    console.error("Error in email_sending cronjob:", err);
+    process.exit(1);
+  }
+})();