DSV-SP

Semestral project for the subject B6B32DSV on FEE CTU in winter semester 2019.

Task

Shared variable

• Implement a program to access the shared variable..
• Realize access using either a 'leader' or exclusive system-wide access.
• Individual nodes will implement at least these functions:
  • read / write variable
  • log off the system
  • exit without logging out
  • log in to the system
• Log into both the console and the file.
  • Logs will be stamped with a logical timestamp.
• Each node will have a unique identification.
  • A combination of IP address and port is recommended.

(Translated from Czech original)

Implementation

Overview

• Written in: TypeScript (transpiled into JavaScript)
• Runtime Environment: Node.js
• Libraries used:
  • ws - WebSocket server (and client)
  • express - minimalist web server
  • axios - HTTP client
  • log4js - debugging utility
  • and more... (Check package.json)
• Algorithm: Chang and Roberts - ring-based coordinator election algorithm

Topology description

API Reference

Tests

Installation

1. Clone repository
2. cd DSV-Semestralka/
3. npm install -g yarn and yarn install (or just use npm install without installing yarn)

• To build app into native JavaScript run yarn run build
• To fork (start/spawn) Node run:
  • yarn start -- <ARGUMENTS> - Native JavaScript (usage)
  • yarn run debug -- <ARGUMENTS> - TypeScript by ts-node (usage)
• To deploy Nodes to different machines:
  • Edit servers,username,password variables in deploy.js file
  • Run yarn run deploy -- <tip> (<tip> is template IP address)

(You can always use npm instead of yarn)