Distributed-File-System

Implementation of Distributed File System Using REST Service.

Name : Aditya Bhati
Student_id : 16343086
Email: bhatia@tcd.ie

-> Dependencies

Python 2.7

Flask 0.12.2 - For REST API

Mongodb

diskcache

pymongo 3.5.1

Installation

cmd terminal mongod

run authentication.py

Run Directorysv.py

Run user.py

authentication.py( Authentication and Transparent file access)

This is the most important part of this project as when an user is added, it must have authentication in order
to interact with the system. U_id ,u_password , p_key(public Key) are the variable that will be used for user authentication.
User will be required to write their username and password which is encrypted we will decrypt it, If a match is found in the database 
period_id gets updated.
Once the autherization is done successfully a ticket is generated in json and is hashed using p_key. This is the stage where authentication is done successfully.

directorysv.py ( Directory Service)

This file manages the location of directories and subdir. file_uploader() , file_delete(), file_download() are the functions 
which are used for data manipulation depending on the RESTful system actions will be take for the according to the user.

Caching

This makes a program efficient by reducing lockup time, Disk Cache is used for system caching, when a user uploads it is
immediately pushed in the cache, If the file is present in the cache it is easily extracted, server_instance() is used to return 
the current server.
It is used for asychronous Transaction.

transaction.py (Transaction)

Two main type of functions a present in this file upload and delete. if the file is updated by the user, the directory server will give the status "success" when a transaction is successfull. 

Lock Service

It has been to manage multiple thread locks  and for managing the trasactions done by the user. In the single thread should handle the 
transaction to avoid deadlock.