bittorrent-python

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bittorrent-python

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A BitTorrent-like network written in python

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# bittorrent-python
This repository contains the implementation of a bittorrent-like P2P network written
in python in collabration with 
[@arman-aminian](https://github.com/arman-aminian "Arman Aminian") and was 
the course project of the Fall 2020 Computer Networks course.

Each node in the network first contacts the tracker to transfer the essential
information and then acts based on that.

## General Explanation
As said before, nodes need to communicate with the tracker to send or receive
the information required for their action, which is either uploading a file or
downloading one. Note that sending/receiving multiple files do not create an
issue since every action is done via a corresponding thread.
Each node's files are placed in a separate folder to simulate the real world.

Possible actions are:
- Upload: The node first tells the tracker it wants to upload a file and the
tracker adds that node to a list holding the `owners` of a file. Then, it 
waits for download requests from other nodes.
- Download: After telling the tracker, the node receives the list of `owners`
of that requested file. Then, asks the file size from one of the owners and
divides that size by the `owners` length. After that,
each uploader sends its portion of the file and the whole process is done via
a thread for each part. After all threads are done, the file is glued together.
- Exit: Exits the network while de-allocating the previously held socket. The
tracker then removes this node from the `owners` list.

## Communication Messages
There are **four** distinct types of message that is transferred between objects
in the network:
1. NodeToTracker: Tells the tracker whether it has a file and wants to upload 
it (mode `have`), wants to receive (download) a file (mode `need`), or wants
to exit the network (mode `exit`).
2. TrackerToNode: Responds to a node who wants to download a file and transfers
the `owner` list of that file to them.
3. SizeInformation: Sent when a node starts downloading a file and wants to 
know the size of that. `size = -1` when the downloader asks the size. 
4. FileCommunication: The most crucial message type which contains the actual
parts of data sent by different nodes.

We tried to make the code self-explanatory, so everything else should be easy
to understand by just looking at the code.

## Usage
First, you need to run the tracker; To do that, simply run `python3 tracker.py`. 
Then you need to run some nodes using the following line:
```commandline
python3 node.py -n <node name> -p <input port> <output port>
```
Now the `node.py` waits for your command to be entered. Possible commands are:
- `torrent -setMode upload <filename>` to upload a file and wait for requests.
- `torrent -setMode download <filename>` to start downloading a file.
- `torrent exit` to exit the network.

## More
`project_files/` contains two files: the project explanation and the project 
report which is a complete guide of how this program works. Both written in
persian.

These are some improvements that **might** be done in the future:
- Adding Documentation.
- Not every node has the full file, so we need to assign the uploaders their
portion of the file based on some other formula to balance everything.
- The downloader may not receive the whole file, so we need to request the
missing parts again.

## Contributions
Any form of feedback (issues, pull requests, discussion)
would be a huge help to us so thank you in advance!

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