WEECHAT

SW Maestro 2nd

mentee_ Seo Bokyung Park Jungmin

mentor_ Han Daihee

What is weechat?

• Chat System– Social graph

• Shows my affinity with friends

– Instant message• Chats with Twitter followers

Challenges

• Scalable system– Needs to support millions of users– Solution Tornado webserver + MongoDB

• Integrated authentication– Not need to create a new account– Solution OAuth from Twitter

• Calculates affinity of my friends– Builds social graph to show affinity– Solution

• Scores of relationship among followers• #DMs_in_recent_n_months x 2 + #being_mentioned

SW Environment

• Web/Chat Server– Tornado server

• Scalable django-like server

• Database– mongoDB

• scalable, open source, document-oriented database• Pymongo: mongoDB Python client

• Function– Chat

• Websocket• Libevent

– Graph• Javascript/CSS• HTML5

Weechat.kr

Chat server

twitter.-com

WeechatMongo DB

Chat serverMongo DB

Oauth login

Twitter ID/Passwd

user

Connect Chatting Room

Followers, streaming

Create Chatting Room

System architecture and Data Flow

Twitter ID/Passwd

oauth

Access token

char room create/join

Chat server address,Room id, member id

user Weechat twitter.com Chat server

Cham id, member id

Call twitter API

Friends, streaming,Direct mesgs

Social graph

Selects a friend to talk

DB (mongo)

Encrypted room id, member id

DB (mongo)

Storing a list of friends, and affinity

Stores a tuple (twitter id, room id, member id)

System Sequence Diagram

Chat mesg

Others’ Chat mesgStores chat logs

DEMO

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