In this project, your task is to build a system which downloads a large size file from
multiple servers simultaneously. Each server should have a separate copy of the file and should operate independently. The file on each server should be fragmented and the client should download the fragments of file from different servers simultaneously based on availability of the server for service and then combine them on the client side. On completion of this project, you will gain sufficient expertise in the following skills:
    • Socket programming in python
    • File segmentation and recombination
    • Server setup and handling the server failure
    • Download resuming


3 Functionalities
3.1 Servers
You have to create virtual servers with a copy of a video file on each server. The file should be segmented on each server. 
Your server program file should be named ‘server.py’. The command line syntax for the server is given below:
server.py	-i	<status_interval>	-n <num_servers>	-f <file_location> -p   <list_of_server_port_numbers>

-i	(Required)	Time interval in seconds between server status reporting
-n	(Required)	Total number of  virtual servers
-f	(Required)	Address pointing to the file location
-p	(Required)	List of port numbers(‘n’ port numbers, one for each server)
3.2 Client 
Your client should be named client.py. The command line syntax for the client is given below:
Client.py	-r -i <metric_interval> -o <output_location> -a <server_ip_address> -p <list_of_server_port_numbers>
-i	(Required)	Time interval in seconds between metric reporting (section 3.4)
-o	(Required)	path of output directory
-a	(Required)	IP address of server
-p	(Required)	List of port numbers (one for each server)
-r	(optional)	Whether to resume the existing download in progress
Once the client is executed, it should actively seek all the servers available at the given port numbers, upon unsuccessful communication to any of the the server should follow the Server Failure Handling explained in section 3.3.
When the client finishes downloading the file segments, it should combine all the segments of the file and place the file in the output directory.
3.3 Handling Server Failure and Load Balancing
The program should have basic server failure tolerance i.e upon any server crashing or simply closing any server, the client shouldn’t lose that chunk of data and rather send request to the currently live servers and divide the load among them in a way that ensures load balancing and still successfully obtain the video file at the client side. 
3.4  Output and metric reporting
3.4.1 Client
The client should print an output that indicates the download status according to the interval specified to -i flag. Suppose the file is being downloaded from 4 simultaneous servers,  the output in this case should be according to the follow format:
Server 1: <downloaded_bytes>/<total_bytes>, download speed: <speed>kb/s
Server 2: <downloaded_bytes>/<total_bytes>, download speed: <speed>kb/s
Server 3: <downloaded_bytes>/<total_bytes>, download speed: <speed>kb/s
Server 4: <downloaded_bytes>/<total_bytes>, download speed: <speed>kb/s
Total: <downloaded_bytes>/<total_bytes>, download speed: <speed>kb/s
If the interval specified to -i flag is 2, then this output should be printed every 2 seconds. You should report the download speed from each server as specified.
3.4.2 Server
The server  should print an output that indicates the port number, options to shutdown each server and  the status of each server according to the interval specified to -i flag. Suppose there are four servers, the output in this case should be according to the following format:
Server 1: Port: <port_no> Status: <dead/alive>, To Shutdown Server 1 Enter: E1
Server 2: Port: <port_no> Status: <dead/alive>, To Shutdown Server 2 Enter: E2
Server 3: Port: <port_no> Status: <dead/alive>, To Shutdown Server 3 Enter: E3
Server 4: Port: <port_no> Status: <dead/alive>, To Shutdown Server 4 Enter: E4
3.5 Download Resuming
In a scenario where we lose all servers or connection to client is simply lost, upon re-establishing connection the download should resume from the progress where the connection was lost between client and server.
4 Specifications
 Following are some of the points you need to keep in mind before working on your project:
    • You are required to use the Python programming language while working on this project.
    • You cannot use any high level abstract libraries to achieve the full functionality via simple use, you need to create your own program for the core functionalities of this project.
    • You can use sockets library for basic TCP  functionality.
    • You need to make sure the client makes use of all the servers available
    • The Request mechanism should not be static in nature i.e the client should make use of the available servers and apply load balancing
    • The file used for transferring should specifically be a video file and the minimum size should be at least 5Mb and at most 10Mb.
    • The servers should not be aware of other servers and not communicate with them in any capacity. 
    • For demo client and server both should be on separate machines also bring the client code in a flash drive.