Modern Web 2016
Using Golang to build smart IM Bot
Evan Lin @LinkerNetworkshttp://goo.gl/IYv1BU

About Me
• Cloud Architect @ Linker
Networks
• Top 10 Taiwan Golang open
source contributor (github
award)
• Developer, Curator, Blogger

Agenda
• What is IM Bot
• Introduce Golang
• Build Line Bot
• Build FB Bot
• Build a smart IM Bot
• Future
• Q&A

Instant Message Bot

What is IM?
(Instant Messenger)

What is IM Bot?

How to choose
programming language
• Easy to Write
• Fast in Run and
Compile
• Powerful Concurrency
• Powerful Built-in
Toolchain

Pokemon GO

Programming GO

What is Go(lang)
• Create by Google
• Design by
• Ken Thompson
• Rob Pike
• Robert Griesemer,
• Feature:
• Compiled
• Statically Typed
• Garbage Collection

Why Golang
• GO Fast!
• Compile Fast!
• Run Fast!

Go is Fast

Why Golang
• Make programming
fun again.

gofmt / goimport

Before we look code

Before we look code (cont)

After file save..

Go Vet
Analysis on source code and reports
suspicious constructs.

Go Lint
Coding style suggestions

GoRoutine:
Multiple Thread in C

GoRoutine:
Multiple Thread in Go

GoRoutine and Channel:
Multiple Thread in Go

GoRoutine and Channel:
Multiple Thread in Go

GoRoutine and Channel:
Multiple Thread in Go

https://talks.golang.org/2014/gocon-tokyo.slide

Golang - HTTPS Server

Golang - HTTPS Server
Supported
HTTP/2
After Go 1.6

Golang - Built-In Test

Golang - Built-In Benchmark Test

GoMobile
Original Work Flow
Golang
Sample Console
Sometime Failed
Work
Failed on Some Model

GoMobile
Using Golang in Mobile
Golang
GoMobile
Package
Golang
Sample Console

Go Playground:
Write A snippet Go code online
https://play.golang.org/

Go JSON Tutorial

Go JSON Tutorial

Go JSON Tutorial

Golang IDE
(Integrated Development Environment)

Golang IDE
(Integrated Development Environment)
VIM-GO

Golang IDE
(Integrated Development Environment)
Visual Studio Code Go Extension

Let’s build IM Bot.

Wait!
What is IM Bot working
flow?

IM Bot Working Flow:
HTTPS Webhook

How to prepare HTTPS
server?
• Prepare a machine with
public IP
• Install related OS and
runtime for your
programming language
• Purchase CA signed for
SSL Key ($$)
• Run a HTTPS Webserver
(Apache or Go native
Web Server)

Introduce Heroku
(Platform As A Service)
Free-tier

Heroku
(Platform As A Service)
• Free-tier:
• USES AN ACCOUNT-
BASED POOL
• OF FREE DYNO HOURS
• SLEEPS AFTER 30 MINS OF
INACTIVITY
• CUSTOM DOMAINS
• HTTPS connection (for
non-custom domains)
• Support one click deploy

IM Bot Working Flow
(update)
HTTPS Webhook

Build IM Line Bot

Step 1: Request Line Bot Trial Account
Apply Line Bot trial account here
(Only 1 per Line Account)

Step 2: Deploy to Heroku by
one click
Link : https://github.com/kkdai/LineBotTemplate

Step 2: Deploy to Heroku by
one click
Remember this address

Step 3. Fill your Heroku App
Callback address to Line Bot
• Copy your app
address from
Heroku to Line
Dashboard.
• It will be something
like “https://
xxxxxx.herokuapp.
com:443/callback”
Fill your app dress here

Step 4. Get related Line Bot
info for Heroku App setting
• Need copy
following
variable:
• Channel ID
• Channel Secret
• MID
Need copy those three

Step 5. Fill your Line Bot
Information to Heroku Variables
• In Heroku [Dashboard] ->
[Settings]-> [Config
Variables]
• Create following variables:
• ChannelID
• ChannelSecret
• MID
• Fill with you just got from
Line Bot Dashboard.

Send a Image to user
Parse bot request to received result

Send a Image to user
Make sure it is text message not operation

Send a Image to user
Send image to who text to the bot

“Hello” message from Line
Bot
Hello

Send a “Hello” message when add bot as
friend
Determine the operation type

Send a “Hello” message when add bot as
friend
Get request from ID, this is only way for now

Example: PetNeedMe
https://github.com/kkdai/LineBotPetNeedMe

Build Facebook Bot

Step 1: Deploy to Heroku
Link : https://github.com/kkdai/FBBotTemplate

Remember this address

Step 2: Create Facebook
Page

Step 3: Create App for
Messenger
• Create new app
“Web App”
• Select new
product
“Messenger”

Step 4: Create App Token
• Select generate
token.
• Need a “Page”

Step 5: Paste token to
Heroku Variable

Step 6: Setup Page
Subscription for Messenger Bot
https://APP_ADDRESS.herokuapp.com/webhook
Token we just generate

Step 7: Select a Page for
your Webhooks

Step 8: Select a Page for
your Webhooks

Example: PetNeedMe

Build A Smart IM Bot

IM ?

IM Bot 10 years ago
“ ”
: https://briian.com/2536/msn-bot.html

IM Bot 10 years later
“Fugle ”

• Left Brain
• Logical
• Verbal
• Language

?

?
?

?
?
?
?
?
?
?

?
Intent: ??
Entity: ??

?
Intent: Check Weather
Entity: ??

?
Intent: Check Weather
Entity: Taipei

Use LUIS to build smart
Bot

Use LUIS to build smart
Bot

LUIS

Other Natural Language
Processing Tool

Future

Future :
Bot to Bot (No more API)

Future :
Customer Service Bot
http://www.mobile01.com/topicdetail.php?f=383&t=4078424

Future :
For Your Website and Business

Future :
For Your Website and Business

Future :
How About Build Right Brain?

We are Hiring..
1. NFV/SDN Expert
2. Data Engineer

http://weekly.codetengu.com/

Go
Call For Speaker