peerjs-py

peerjs-py

peerjs-py is a Python implementation of the PeerJS library, allowing peer-to-peer connections in Python applications.

Installation

To install peerjs-py, use pip:

pip install peerjs-py

Usage

Connecting to a PeerJS Server

First, import the necessary modules and create a Peer instance:

python
from peerjs_python import Peer, PeerOptions

Create a Peer instance

peer = Peer(PeerOptions(
host='your-peerjs-server.com',
port=9000,
secure=True # Use this if your server uses HTTPS
))

Listen for the 'open' event to know when the connection to the server is established

@peer.on('open')
def on_open(id):
print(f"My peer ID is: {id}")

Connecting to Another Peer

To connect to another peer and send text data:

#Establish a connection
conn = peer.connect('remote-peer-id')

@conn.on('open')
def on_open():
  # Connection is now open and ready for use
  conn.send('Hello, remote peer!')
@conn.on('data')
def on_data(data):
  print(f"Received: {data}")

Voice/Video Calls

For voice or video calls, you'll need to use additional libraries like PyAudio for audio processing. Here's a basic example:

python
import pyaudio
# Initialize PyAudio
p = pyaudio.PyAudio()
# Open a call connection

call = peer.call('remote-peer-id', {'audio': True, 'video': False})

@call.on('stream')
def on_stream(stream):
  # Handle the incoming audio stream
  # This is a simplified example and would need more code to actually play the audio

@peer.on('call')
def on_call(call):
  # Answer incoming calls automatically
  call.answer({'audio': True, 'video': False})

@call.on('stream')
def on_stream(stream):
  # Handle the incoming audio stream

File Transfer

To send files between peers:

#Sending a file
with open('file.txt', 'rb') as file:
  data = file.read()
  conn.send({'file': data, 'filename': 'file.txt'})

# Receiving a file
@conn.on('data')
def on_data(data):
  if isinstance(data, dict) and 'file' in data:
     with open(data['filename'], 'wb') as file:
       file.write(data['file'])
    print(f"Received file: {data['filename']}")

Error Handling

Always implement error handling to manage potential connection issues:

@peer.on('error')
def on_error(error):
  print(f"An error occurred: {error}")

Testing

To ensure the reliability and functionality of peerjs-py, we have implemented a comprehensive testing suite. Before running the tests, please note that you must have your own PeerJS signaling server set up.

Running Tests

We use pytest as our testing framework. To run the tests, follow these steps:

• Ensure you have pytest installed:

  pip install pytest
  

• Navigate to the project root directory.

• Run the tests using pytest:

  pytest
  

End-to-End Tests

We have two types of end-to-end (e2e) tests to verify the functionality of peerjs-py in different scenarios:

• Python Client to Python Client Test This test checks the communication between two Python clients using peerjs-py.

  To run this test:

  ./e2e/run-e2e.sh
  

• PeerJS Browser Client to Python Client Test This test verifies the compatibility between a PeerJS browser client and a Python client using peerjs-py.

  To run this test:

  ./e2e/run-e2e-test-py.sh
  

Important Notes

• Ensure your PeerJS signaling server is running and accessible before executing the tests.
• The end-to-end tests may require additional setup or dependencies. Please refer to the respective script files for any specific instructions.
• If you encounter any issues during testing, check your server configuration and network connectivity.

By running these tests, you can verify that peerjs-py is working correctly in various scenarios and is compatible with both Python-to-Python and Browser-to-Python communications.