Distributed File Server

Summary of features

• A Python application that works like a manager to control the file-servers and get the requests from the clients.
• A node.JS server that can have multiple instances in different environments that store the files
• Balance the number of files per server, as file-servers connects and clients send files
• Restrict 36 files per directory, if it exceeds, should create a new directory

Client

Not implemented yet. Responsible for sending requests to the manager.

File Manager

Implemented with Python using the Flask framework to provide a REST API, MongoDB to persist files and Socket.IO to communicate with File Servers

• Receive client requests
• Control which server should receive which file
• Persist information about files
• Balance servers

File Server

Implemented with node.JS using socket.IO to communicate with the File Manager.

• Connect with manager using Socket.IO
• Receive manager requests like:
  • delete-file
  • upload-file
  • download-file
  • transfer-file
• Control how many files per directory to do not exceed the number provided (36) then create another

Requirements

• Can have many file-servers running simultaneously
• A file send to the File-Manager should be saved in only one server
• There's no replication between file-servers
• A file server must have only 36 files/folder per directory
• The client will send a base64 file, but the file-server must save it as a normal

Upload File

Store a file in one of the file-servers

Request

POST: http://localhost:8000/file

Body:

Field	Description	Required
filename	Name of the file, will be used to get the file later	X
file	Content of the file encoded in base64	X

Response

• filename: Filename provided
• id: Generated ID for the file saved

Download file

Get the content of the file with the name provided

GET: http://localhost:8000/file/:filename

Delete file

Delete the file of the file with the name provided

DELETE: http://localhost:8000/file/:filename

Response codes

Code	Content	Description
1	Servers unavailable	When no server is available
2	File does not exist	When the client request a file that does not exists
3	File name already exists	When the client tries to upload a file with a name that is already in use
4	File unavailable	When the server of the file requests is unavailable

Instructions

# Clone de project
git clone --depth=1 https://github.com/pedrokehl/distributed-file-server.git

# Run MongoDB
Execute mongod

# Go to file-server-manager directory and install Python dependencies
pip install -r requirements.txt

# Run the manager
python main.py

# Open another terminal and go to the file-server-storage diretory    
# Install dependencies (use --production flag if you don't want devDependencies)
npm install

# Start the server with the server id
node index.js 100

TODO

• Implement the client
• Change the manager to accept files directly instead of base64