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socket.io on SmartFx

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a case study of forex information website using socket.io

a case study of forex information website using socket.io

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    socket.io on SmartFx socket.io on SmartFx Presentation Transcript

    • Socket.IO on SmartFX Takeshi Morita @takeshy Minkabu Inc.
    • CONTENTS  What is SmartFX?  Coding Hints for the usage of Socket.IO  Considerations on using Socket.IO  The Middleware, Socket.IO-ReqEv  Operation of Socket.IO server  Redundancy and load balancing  Shutdown in case of deploy
    • What is SmartFX?
    • What is SmartFX?  A free site for smartphone developed by Minkabu to provide FX information including news, charts and predictions  A real-time Single Page Application based on Socket.IO and Backbone.js Go to - http://smartfx.jp or real URL http://smartfx.minkabu.jp
    • Coding Hints for the usage of Socket.IO
    • Considerations on using Sockeet.IO  Socket.IO has powerful Socket managing tools of “NameSpace”, “Rooms” and “Events”  Their interchangeable feature, there's more than one way to manage a broadcast client.  We, therefore, introduced our own coding rules in SmartFX
    • Coding Rules in SmartFX  One Object for One NameSpace  One Event for One Room with One EventName  Each event shall be emitted using Room feature  Define 3 Types of Event of “message”, ”reply” and ”error”  “message” shall be used for the data transfer from a client to the server  “reply” and ”error” shall be used for from the server to a client
    • The Middleware, Stock.IO-ReqEv  With coding rules, succeeded to create a Middleware with specialized feature of Stock.IO procedures  We named the Middleware “Socket.IO-ReqEv”  You can install below npm install socket.io-reqev
    • How to use Socket.IO-ReqEv -the server side- Only 2 steps 1. Create a IOReqEv object with an initial value of a Socket.IO object. 2. Call “register” method giving NameSpace & object met with the rule of IO-ReqEv *Example above shows the simplest case of one set of registration. This “register” method can be called repeatedly.
    • Rules to pass objects to Socke.IO- ReqEv 1. Set event name to the property of array “events” 2. Emit event with data, inheriting EventEmitter 3. Implement a method “request”, which Socket.IO-ReqEv calls when a message from client includes a parameter of “requests” . This works similar to HTTP GET *Codes on the left runs to broadcast events every second/minute and emit the current time
    • How to use Socket.IO-ReqEv -the client side- Only 2 steps on browser 1. Create IOReqEvClient, giving the url which includes the address of Socket.IO and namespace, and callback 2. Call a method “watch” to subscribe an event and to get a request *unsubscribe automatically unnecessary events previously called, once the method “watch” is called again with another events
    • Implementation of Socket.IO-ReqEv  The library of Socket.IO-ReqEv is written with just less than 60 coding lines  Moreover, the library is written with public properties only on Socket.IO 1.0, while there were some non- public properties on 0.9.x  The source code of Socket.IO-ReqEv is available at url below https://github.com/takeshy/socket.io-reqev
    • Operation of Socket.IO server
    • System Configulation
    • Redundancy and Load Balancing  Redundancy and load balancing are accomplished-  Socket.IO server updates its record on the DB periodically  WebServer gets a list of address of Socket.IO server recently updated from the DB  WebServer Returns one of them randomly to a client
    • Redundancy and Load Balancing Sequences
    • Shutdown in case of Deploy  Delete command in demon management tool of pm2 does not work under the situation of Socket.IO being always connected to client  To solve this problem, developed a self-shutdown mechanism of Socket.IO server
    • The Workflow of Deploy  Update app source code in the Socket.IO server, and run the script which executes pm2 command of “delete” and “start”. (by capistrano)  Set “inactive” to the status field of the Socket.IO record on the DB  Once the Socket.IO detects its own record set as “inactive”, the server broadcasts inactive event to clients and set timer to kill itself a minute later  A client which received inactive event displays a popup message saying “disconnected the server” in case the user stays more than 1 minute. (in case a user goes to different page, the client gets another server address, then network connection stays)  Set “activate” to the status field of the Socket.IO record on the DB
    • Socket.IO Shutdown Sequences
    • Thank you!