Serverless LineBot Reminder builds on Heroku Scheduler

A serverless line-bot reminder builds on Heroku addon Scheduler

Requirements

• Node.js 4 or higher

Documents

• Heroku create app
• Heroku Scheduler
• Line Bot API
• Line Bot SDK Nodejs

Getting Start

Install

Make a directory of linebot reminder

mkdir line-bot-reminder-demo
cd line-bot-reminder-demo

Build dependencies Using npm:

npm init

Install line-bot-sdk-nodejs

npm install @line/bot-sdk --save

reminder.js

'use strict';
const line = require('@line/bot-sdk');

const defaultAccessToken = 'CHANNEL_ACCESS_TOKEN';
const defaultSecret = 'CHANNEL_SECRET';
const defaultUserId = 'USER_ID';

// create LINE SDK config from env variables
const config = {
  channelAccessToken: process.env.CHANNEL_ACCESS_TOKEN || defaultAccessToken,
  channelSecret: process.env.CHANNEL_SECRET || defaultSecret,
};

// create LINE SDK client
const client = new line.Client(config);

// create user ID from env variable
const userId = process.env.USER_ID || defaultUserId;

let message = [
  {
    type: "text",
    text: "Hello world!"
  },
  {
    type: "sticker",
    packageId: "1",
    stickerId: "410"
  }
];

client
  .pushMessage(userId, message)
  .then(() => console.log({
    success: true,
    events: message
  }))
  .catch(err => console.log(err))

Deploy

Deploy to heroku using git

git init
git add .
git commit -m "First reminder."

Create heroku app and deploy

heroku create line-bot-reminder-demo
git push heroku master

Set env

heroku config:set CHANNEL_ACCESS_TOKEN=your_channel_access_token
heroku config:set CHANNEL_SECRET=your_channel_secret
heroku config:set USER_ID=your_user_id

Set addon Scheduler

heroku addons:create scheduler:standard
heroku addons:open scheduler

On the Scheduler Dashboard, click "Add New Job" Enter a task "node reminder.js" Select a frequency and next run time Done!

Test Scheduler

heroku run node reminder.js

View logs

heroku logs --ps scheduler.1