Websocket Status

[acul71]

Last Update: Sep 2025

WebSocket Missing Go Features Analysis

Overview

This document analyzes the missing WebSocket features in the Python libp2p implementation compared to the Go implementation, providing Go code snippets as reference guides for implementation.

Missing Features Analysis

1. Proxy Support (SOCKS)

Status: ❌ Missing in Python

Go Implementation Reference:

// From: p2p/transport/websocket/websocket_test.go
func TestSocksProxy(t *testing.T) {
    // Test SOCKS proxy configuration
    proxyURL, err := url.Parse("socks5://127.0.0.1:1080")
    require.NoError(t, err)
    
    // Configure WebSocket transport with proxy
    transport, err := New(upgrader, nil, nil, WithProxy(proxyURL))
    require.NoError(t, err)
    
    // Test dialing through proxy
    conn, err := transport.Dial(ctx, multiaddr, peerID)
    require.NoError(t, err)
    defer conn.Close()
}

Python Implementation Needed:

• Add WithProxy() configuration option
• Implement SOCKS proxy dialing in WebsocketTransport.dial()
• Add proxy configuration tests

2. Concurrent Connection Management

Status: ❌ Missing in Python

Go Implementation Reference:

// From: p2p/transport/websocket/websocket_test.go
func TestConcurrentClose(t *testing.T) {
    // Test concurrent connection closing
    conn, err := transport.Dial(ctx, multiaddr, peerID)
    require.NoError(t, err)
    
    // Close connection concurrently from multiple goroutines
    var wg sync.WaitGroup
    for i := 0; i < 10; i++ {
        wg.Add(1)
        go func() {
            defer wg.Done()
            conn.Close()
        }()
    }
    wg.Wait()
}

Python Implementation Needed:

• Add concurrent close testing
• Implement proper connection state management
• Add race condition testing

3. Handshake Timeout Configuration

Status: ❌ Missing in Python

Go Implementation Reference:

// From: p2p/transport/websocket/websocket_test.go
func TestHandshakeTimeout(t *testing.T) {
    // Test handshake timeout
    transport, err := New(upgrader, nil, nil, WithHandshakeTimeout(100*time.Millisecond))
    require.NoError(t, err)
    
    // Attempt connection with short timeout
    ctx, cancel := context.WithTimeout(context.Background(), 50*time.Millisecond)
    defer cancel()
    
    _, err = transport.Dial(ctx, multiaddr, peerID)
    require.Error(t, err)
    require.Contains(t, err.Error(), "timeout")
}

Python Implementation Needed:

• Add WithHandshakeTimeout() configuration
• Implement timeout handling in connection establishment
• Add timeout testing

4. Zero-byte Write Handling

Status: ❌ Missing in Python

Go Implementation Reference:

// From: p2p/transport/websocket/websocket_test.go
func TestWriteZero(t *testing.T) {
    // Test zero-byte write handling
    conn, err := transport.Dial(ctx, multiaddr, peerID)
    require.NoError(t, err)
    defer conn.Close()
    
    // Write zero bytes
    n, err := conn.Write([]byte{})
    require.NoError(t, err)
    require.Equal(t, 0, n)
    
    // Write single zero byte
    n, err = conn.Write([]byte{0})
    require.NoError(t, err)
    require.Equal(t, 1, n)
}

Python Implementation Needed:

• Add zero-byte write testing
• Ensure proper handling of empty writes
• Add edge case testing

5. Multiaddr Resolution

Status: ❌ Missing in Python

Go Implementation Reference:

// From: p2p/transport/websocket/websocket_test.go
func TestResolveMultiaddr(t *testing.T) {
    // Test multiaddr resolution
    testCases := []struct {
        input    string
        expected string
    }{
        {"/ip4/127.0.0.1/tcp/0/ws", "/ip4/127.0.0.1/tcp/0/ws"},
        {"/ip6/::1/tcp/0/ws", "/ip6/::1/tcp/0/ws"},
        {"/dns/localhost/tcp/0/ws", "/dns/localhost/tcp/0/ws"},
    }
    
    for _, tc := range testCases {
        addr, err := ma.NewMultiaddr(tc.input)
        require.NoError(t, err)
        
        resolved, err := transport.Resolve(ctx, addr)
        require.NoError(t, err)
        require.Equal(t, tc.expected, resolved.String())
    }
}

Python Implementation Needed:

• Add Resolve() method to transport
• Implement multiaddr resolution logic
• Add resolution testing

6. Listener Address Management

Status: ❌ Missing in Python

Go Implementation Reference:

// From: p2p/transport/websocket/websocket_test.go
func TestListenerAddr(t *testing.T) {
    // Test listener address management
    listener, err := transport.Listen(multiaddr)
    require.NoError(t, err)
    defer listener.Close()
    
    // Get listener address
    addr := listener.Multiaddr()
    require.NotNil(t, addr)
    require.Contains(t, addr.String(), "/ws")
    
    // Verify address is valid
    _, err = ma.NewMultiaddr(addr.String())
    require.NoError(t, err)
}

Python Implementation Needed:

• Add Multiaddr() method to listener
• Implement proper address tracking
• Add listener address testing

7. AutoTLS Integration

Status: ❌ Missing in Python

Go Implementation Reference:

// From: examples/autotls/main.go
func main() {
    // Create AutoTLS certificate manager
    certManager, err := p2pforge.NewP2PForgeCertMgr(
        p2pforge.WithCAEndpoint(p2pforge.DefaultCATestEndpoint),
        p2pforge.WithCertificateStorage(&certmagic.FileStorage{Path: "p2p-forge-certs"}),
        p2pforge.WithLogger(rawLogger.Sugar().Named("autotls")),
    )
    require.NoError(t, err)
    
    // Configure WebSocket transport with AutoTLS
    h, err := libp2p.New(
        libp2p.ListenAddrs(
            fmt.Sprintf("/ip4/0.0.0.0/tcp/5500/tls/sni/*.%s/ws", p2pforge.DefaultForgeDomain),
            fmt.Sprintf("/ip6/::/tcp/5500/tls/sni/*.%s/ws", p2pforge.DefaultForgeDomain),
        ),
        libp2p.Transport(ws.New, ws.WithTLSConfig(certManager.TLSConfig())),
        libp2p.AddrsFactory(certManager.AddressFactory()),
    )
    require.NoError(t, err)
}

Python Implementation Needed:

• Create AutoTLS example
• Implement certificate management
• Add browser connectivity support

8. Advanced TLS Configuration

Status: ❌ Limited in Python

Go Implementation Reference:

// From: p2p/transport/websocket/websocket_test.go
func TestDialWss(t *testing.T) {
    // Test WSS with custom TLS config
    tlsConfig := &tls.Config{
        InsecureSkipVerify: true,
        ServerName:         "localhost",
    }
    
    transport, err := New(upgrader, nil, nil, 
        WithTLSConfig(tlsConfig),
        WithTLSClientConfig(tlsConfig),
    )
    require.NoError(t, err)
    
    // Test WSS connection
    conn, err := transport.Dial(ctx, wssMultiaddr, peerID)
    require.NoError(t, err)
    defer conn.Close()
}

Python Implementation Needed:

• Add WithTLSClientConfig() option
• Implement advanced TLS configuration
• Add SNI support

9. Connection State Management

Status: ❌ Missing in Python

Go Implementation Reference:

// From: p2p/transport/websocket/conn.go
type Conn struct {
    // Connection state tracking
    state    int32
    closed   int32
    closeErr error
    
    // State constants
    const (
        stateOpen = iota
        stateClosed
    )
}

func (c *Conn) Close() error {
    if !atomic.CompareAndSwapInt32(&c.closed, 0, 1) {
        return c.closeErr
    }
    
    // Close WebSocket connection
    err := c.conn.Close()
    atomic.StoreInt32(&c.state, stateClosed)
    
    return err
}

Python Implementation Needed:

• Add atomic state management
• Implement proper connection lifecycle
• Add state transition testing

10. Error Handling and Recovery

Status: ❌ Limited in Python

Go Implementation Reference:

// From: p2p/transport/websocket/websocket_test.go
func TestWebsocketListenSecureFailWithoutTLSConfig(t *testing.T) {
    // Test error handling for missing TLS config
    transport, err := New(upgrader, nil, nil) // No TLS config
    require.NoError(t, err)
    
    // Attempt to listen on WSS without TLS
    _, err = transport.Listen(wssMultiaddr)
    require.Error(t, err)
    require.Contains(t, err.Error(), "TLS config required")
}

Python Implementation Needed:

• Add comprehensive error handling
• Implement error recovery mechanisms
• Add error condition testing

11. Interop Testing (JavaScript/Go/Other Languages)

Status: ❌ Failing in Python

Current Python Status:

# From: tests/interop/test_js_ws_ping.py
@pytest.mark.trio
async def test_ping_with_js_node():
    # Skip this test due to JavaScript dependency issues
    pytest.skip("Skipping JS interop test due to dependency issues")

Go Implementation Reference:

// Go has comprehensive interop testing
func TestWebsocketTransport(t *testing.T) {
    // Test with different language implementations
    t.Run("with-js-libp2p", func(t *testing.T) {
        // Test WebSocket connection with JavaScript libp2p
        conn, err := transport.Dial(ctx, jsMultiaddr, jsPeerID)
        require.NoError(t, err)
        defer conn.Close()
        
        // Test ping protocol
        pingData := make([]byte, 32)
        _, err = conn.Write(pingData)
        require.NoError(t, err)
        
        pongData := make([]byte, 32)
        _, err = conn.Read(pongData)
        require.NoError(t, err)
        require.Equal(t, pingData, pongData)
    })
}

Python Implementation Needed:

• Fix JavaScript interop tests (currently skipped)
• Add Go libp2p interop testing
• Add cross-language compatibility testing
• Implement proper dependency management for interop tests

12. Real-World Examples and Browser Integration

Status: ❌ Missing in Python

Go Implementation Reference:

// From: examples/autotls/main.go - Complete browser integration example
func main() {
    // Create AutoTLS certificate manager for browser compatibility
    certManager, err := p2pforge.NewP2PForgeCertMgr(
        p2pforge.WithCAEndpoint(p2pforge.DefaultCAEndpoint), // Production CA
        p2pforge.WithCertificateStorage(&certmagic.FileStorage{Path: "certs"}),
    )
    require.NoError(t, err)
    
    // Create host with WebSocket support for browsers
    h, err := libp2p.New(
        libp2p.ListenAddrs(
            // AutoTLS WebSocket addresses for browser connectivity
            fmt.Sprintf("/ip4/0.0.0.0/tcp/443/tls/sni/*.%s/ws", p2pforge.DefaultForgeDomain),
            fmt.Sprintf("/ip6/::/tcp/443/tls/sni/*.%s/ws", p2pforge.DefaultForgeDomain),
        ),
        libp2p.Transport(ws.New, ws.WithTLSConfig(certManager.TLSConfig())),
        libp2p.AddrsFactory(certManager.AddressFactory()),
    )
    require.NoError(t, err)
    
    // Start DHT for peer discovery
    dht, err := dht.New(ctx, h)
    require.NoError(t, err)
    
    // Start the host
    err = h.Connect(ctx, peer.AddrInfo{ID: peerID, Addrs: addrs})
    require.NoError(t, err)
}

Python Implementation Needed:

• Create AutoTLS example for browser connectivity
• Add Let's Encrypt integration example
• Create browser-to-Python WebSocket example
• Add production deployment examples
• Create chat application example (like Go examples)

13. Production Deployment Examples

Status: ❌ Missing in Python

Go Implementation Reference:

// From: examples/chat/main.go - Production-ready chat application
func main() {
    // Create host with WebSocket support
    h, err := libp2p.New(
        libp2p.ListenAddrs(
            "/ip4/0.0.0.0/tcp/0/ws",  // WebSocket support
            "/ip4/0.0.0.0/tcp/0",     // TCP fallback
        ),
        libp2p.Transport(ws.New),
        libp2p.Transport(tcp.NewTCPTransport),
    )
    require.NoError(t, err)
    
    // Set up chat protocol
    h.SetStreamHandler("/chat/1.0.0", handleChatStream)
    
    // Start peer discovery
    go discoverPeers(ctx, h)
    
    // Start chat interface
    startChatInterface(ctx, h)
}

Python Implementation Needed:

• Create production chat application example
• Add peer discovery examples
• Create deployment configuration examples
• Add Docker/containerization examples
• Create monitoring and logging examples

Missing Examples Implementation Guide

1. AutoTLS Browser Integration Example

What's Missing: Complete browser-to-Python WebSocket connectivity with automatic TLS certificates.

Python Implementation Guide:

# examples/autotls_browser/main.py
import ssl
import tempfile
from pathlib import Path
from libp2p import new_host
from libp2p.crypto.secp256k1 import create_new_key_pair
from multiaddr import Multiaddr
import trio

class AutoTLSCertManager:
    """Simplified AutoTLS certificate manager for Python"""
    
    def __init__(self, domain: str = "localhost"):
        self.domain = domain
        self.cert_dir = Path("autotls-certs")
        self.cert_dir.mkdir(exist_ok=True)
    
    def generate_self_signed_cert(self):
        """Generate self-signed certificate for development"""
        from cryptography import x509
        from cryptography.hazmat.primitives import hashes, serialization
        from cryptography.hazmat.primitives.asymmetric import rsa
        from cryptography.x509.oid import NameOID
        import datetime
        
        # Generate private key
        private_key = rsa.generate_private_key(
            public_exponent=65537,
            key_size=2048,
        )
        
        # Create certificate
        subject = issuer = x509.Name([
            x509.NameAttribute(NameOID.COUNTRY_NAME, "US"),
            x509.NameAttribute(NameOID.STATE_OR_PROVINCE_NAME, "Test"),
            x509.NameAttribute(NameOID.LOCALITY_NAME, "Test"),
            x509.NameAttribute(NameOID.ORGANIZATION_NAME, "Test"),
            x509.NameAttribute(NameOID.COMMON_NAME, self.domain),
        ])
        
        cert = x509.CertificateBuilder().subject_name(subject).issuer_name(issuer).public_key(
            private_key.public_key()
        ).serial_number(x509.random_serial_number()).not_valid_before(
            datetime.datetime.now(datetime.UTC)
        ).not_valid_after(
            datetime.datetime.now(datetime.UTC) + datetime.timedelta(days=365)
        ).add_extension(
            x509.SubjectAlternativeName([x509.DNSName(self.domain)]),
            critical=False,
        ).sign(private_key, hashes.SHA256())
        
        # Save certificate and key
        cert_path = self.cert_dir / f"{self.domain}.crt"
        key_path = self.cert_dir / f"{self.domain}.key"
        
        with open(cert_path, "wb") as f:
            f.write(cert.public_bytes(serialization.Encoding.PEM))
        
        with open(key_path, "wb") as f:
            f.write(private_key.private_bytes(
                encoding=serialization.Encoding.PEM,
                format=serialization.PrivateFormat.PKCS8,
                encryption_algorithm=serialization.NoEncryption(),
            ))
        
        return str(cert_path), str(key_path)
    
    def get_tls_context(self):
        """Get SSL context for WSS connections"""
        cert_path, key_path = self.generate_self_signed_cert()
        
        context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
        context.load_cert_chain(cert_path, key_path)
        return context

async def main():
    """AutoTLS WebSocket example for browser connectivity"""
    print("🚀 Starting AutoTLS WebSocket example...")
    
    # Create certificate manager
    cert_manager = AutoTLSCertManager("localhost")
    tls_context = cert_manager.get_tls_context()
    
    # Create libp2p host with WebSocket support
    key_pair = create_new_key_pair()
    host = new_host(
        key_pair=key_pair,
        listen_addrs=[
            Multiaddr("/ip4/0.0.0.0/tcp/8443/wss"),  # WSS for browsers
            Multiaddr("/ip4/0.0.0.0/tcp/8080/ws"),   # WS fallback
        ],
        tls_server_config=tls_context,
    )
    
    print(f"📡 Host ID: {host.get_id()}")
    print(f"🌐 Listen addresses: {host.get_addrs()}")
    
    # Set up echo protocol for testing
    from libp2p.custom_types import TProtocol
    echo_protocol = TProtocol("/echo/1.0.0")
    
    async def echo_handler(stream):
        """Handle echo protocol streams"""
        data = await stream.read(1024)
        print(f"📨 Received: {data.decode()}")
        await stream.write(data)  # Echo back
        await stream.close()
    
    host.set_stream_handler(echo_protocol, echo_handler)
    
    # Start the host
    async with host.run():
        print("✅ Host started! Ready for browser connections.")
        print("🔗 Connect from browser using:")
        print(f"   wss://localhost:8443/p2p/{host.get_id()}")
        print("   Press Ctrl+C to stop")
        
        try:
            await trio.sleep_forever()
        except KeyboardInterrupt:
            print("\n👋 Shutting down...")

if __name__ == "__main__":
    trio.run(main)

2. Production Chat Application Example

What's Missing: Complete chat application with WebSocket support, peer discovery, and real-time messaging.

Python Implementation Guide:

# examples/chat_websocket/main.py
import json
import logging
from typing import Set, Dict
from libp2p import new_host
from libp2p.crypto.secp256k1 import create_new_key_pair
from libp2p.custom_types import TProtocol
from libp2p.peer.peerinfo import info_from_p2p_addr
from multiaddr import Multiaddr
import trio

# Configure logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

class ChatApplication:
    """Production-ready chat application with WebSocket support"""
    
    def __init__(self):
        self.host = None
        self.connected_peers: Set[str] = set()
        self.chat_protocol = TProtocol("/chat/1.0.0")
        self.ping_protocol = TProtocol("/ipfs/ping/1.0.0")
    
    async def start(self, listen_addrs: list[Multiaddr] = None):
        """Start the chat application"""
        if listen_addrs is None:
            listen_addrs = [
                Multiaddr("/ip4/0.0.0.0/tcp/0/ws"),   # WebSocket
                Multiaddr("/ip4/0.0.0.0/tcp/0"),      # TCP fallback
            ]
        
        # Create host
        key_pair = create_new_key_pair()
        self.host = new_host(
            key_pair=key_pair,
            listen_addrs=listen_addrs,
        )
        
        # Set up protocol handlers
        self.host.set_stream_handler(self.chat_protocol, self._handle_chat_message)
        self.host.set_stream_handler(self.ping_protocol, self._handle_ping)
        
        # Start the host
        async with self.host.run():
            logger.info(f"💬 Chat started! Host ID: {self.host.get_id()}")
            logger.info(f"🌐 Listen addresses: {self.host.get_addrs()}")
            
            # Start peer discovery
            trio.start_soon(self._discover_peers)
            
            # Start chat interface
            await self._chat_interface()
    
    async def _handle_chat_message(self, stream):
        """Handle incoming chat messages"""
        try:
            data = await stream.read(1024)
            message = json.loads(data.decode())
            
            peer_id = stream.get_peer_id()
            logger.info(f"💬 Message from {peer_id}: {message['text']}")
            
            # Echo to all connected peers
            await self._broadcast_message(message, exclude_peer=peer_id)
            
        except Exception as e:
            logger.error(f"❌ Error handling chat message: {e}")
        finally:
            await stream.close()
    
    async def _handle_ping(self, stream):
        """Handle ping protocol for peer discovery"""
        try:
            data = await stream.read(32)
            await stream.write(data)  # Echo back
            peer_id = stream.get_peer_id()
            self.connected_peers.add(peer_id)
            logger.info(f"🏓 Ping from {peer_id}")
        except Exception as e:
            logger.error(f"❌ Error handling ping: {e}")
        finally:
            await stream.close()
    
    async def _discover_peers(self):
        """Discover peers using mDNS"""
        try:
            from libp2p.discovery.mdns import MDNS
            mdns = MDNS()
            await mdns.start(self.host)
            logger.info("🔍 mDNS discovery started")
        except Exception as e:
            logger.warning(f"⚠️ mDNS discovery failed: {e}")
    
    async def _broadcast_message(self, message: dict, exclude_peer: str = None):
        """Broadcast message to all connected peers"""
        for peer_id in self.connected_peers:
            if peer_id == exclude_peer:
                continue
            
            try:
                stream = await self.host.new_stream(peer_id, [self.chat_protocol])
                await stream.write(json.dumps(message).encode())
                await stream.close()
            except Exception as e:
                logger.error(f"❌ Failed to send to {peer_id}: {e}")
                self.connected_peers.discard(peer_id)
    
    async def _chat_interface(self):
        """Simple chat interface"""
        print("\n💬 Chat Commands:")
        print("  /connect <multiaddr> - Connect to a peer")
        print("  /peers - List connected peers")
        print("  /quit - Exit chat")
        print("  <message> - Send message to all peers\n")
        
        while True:
            try:
                user_input = await trio.to_thread.run_sync(input, "💬 ")
                
                if user_input.startswith("/connect "):
                    multiaddr_str = user_input[9:].strip()
                    await self._connect_to_peer(multiaddr_str)
                elif user_input == "/peers":
                    print(f"👥 Connected peers: {list(self.connected_peers)}")
                elif user_input == "/quit":
                    break
                else:
                    # Send message
                    message = {"text": user_input, "from": str(self.host.get_id())}
                    await self._broadcast_message(message)
                    
            except KeyboardInterrupt:
                break
            except Exception as e:
                logger.error(f"❌ Error in chat interface: {e}")
    
    async def _connect_to_peer(self, multiaddr_str: str):
        """Connect to a peer using multiaddr"""
        try:
            multiaddr = Multiaddr(multiaddr_str)
            peer_info = info_from_p2p_addr(multiaddr)
            await self.host.connect(peer_info)
            
            # Test connection with ping
            stream = await self.host.new_stream(peer_info.peer_id, [self.ping_protocol])
            await stream.write(b"ping")
            await stream.close()
            
            logger.info(f"✅ Connected to {peer_info.peer_id}")
            
        except Exception as e:
            logger.error(f"❌ Failed to connect to {multiaddr_str}: {e}")

async def main():
    """Main function"""
    chat = ChatApplication()
    await chat.start()

if __name__ == "__main__":
    trio.run(main)

3. Interop Testing Example

What's Missing: Cross-language compatibility testing with JavaScript and Go libp2p.

Python Implementation Guide:

# tests/interop/test_websocket_interop.py
import pytest
import trio
import subprocess
import tempfile
import json
from pathlib import Path
from libp2p import new_host
from libp2p.crypto.secp256k1 import create_new_key_pair
from multiaddr import Multiaddr

class InteropTestRunner:
    """Test runner for cross-language WebSocket interop"""
    
    def __init__(self):
        self.temp_dir = Path(tempfile.mkdtemp())
        self.js_node_process = None
        self.go_node_process = None
    
    async def setup_js_node(self):
        """Set up JavaScript libp2p node for testing"""
        js_code = """
const { createLibp2p } = require('libp2p')
const { webSockets } = require('@libp2p/websockets')
const { noise } = require('@chainsafe/libp2p-noise')
const { yamux } = require('@chainsafe/libp2p-yamux')
const { identify } = require('@libp2p/identify')

async function createNode() {
    const node = await createLibp2p({
        addresses: {
            listen: ['/ip4/0.0.0.0/tcp/0/ws']
        },
        transports: [webSockets()],
        connectionEncryption: [noise()],
        streamMuxers: [yamux()],
        services: {
            identify: identify()
        }
    })
    
    await node.start()
    console.log('JS Node started:', node.peerId.toString())
    console.log('Listen addresses:', node.getMultiaddrs().map(ma => ma.toString()))
    
    // Handle ping protocol
    node.handle('/ipfs/ping/1.0.0', ({ stream }) => {
        stream.pipe(stream) // Echo back
    })
    
    // Keep running
    process.on('SIGINT', async () => {
        await node.stop()
        process.exit(0)
    })
}

createNode().catch(console.error)
"""
        
        # Write JS code to temp file
        js_file = self.temp_dir / "js_node.js"
        js_file.write_text(js_code)
        
        # Install dependencies
        package_json = {
            "name": "interop-test",
            "version": "1.0.0",
            "dependencies": {
                "libp2p": "^0.45.0",
                "@libp2p/websockets": "^0.1.0",
                "@chainsafe/libp2p-noise": "^0.1.0",
                "@chainsafe/libp2p-yamux": "^0.1.0",
                "@libp2p/identify": "^0.1.0"
            }
        }
        
        package_file = self.temp_dir / "package.json"
        package_file.write_text(json.dumps(package_json, indent=2))
        
        # Install dependencies
        subprocess.run(["npm", "install"], cwd=self.temp_dir, check=True)
        
        # Start JS node
        self.js_node_process = subprocess.Popen(
            ["node", str(js_file)],
            cwd=self.temp_dir,
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE
        )
        
        # Wait for node to start
        await trio.sleep(2)
        
        # Parse output to get peer ID and addresses
        try:
            stdout, stderr = self.js_node_process.communicate(timeout=5)
            if self.js_node_process.returncode != 0:
                raise Exception(f"JS node failed to start: {stderr.decode()}")
        except subprocess.TimeoutExpired:
            # Node is still running, which is expected
            pass
    
    async def test_python_to_js_websocket(self):
        """Test Python WebSocket client connecting to JS WebSocket server"""
        await self.setup_js_node()
        
        # Create Python host
        key_pair = create_new_key_pair()
        host = new_host(
            key_pair=key_pair,
            listen_addrs=[Multiaddr("/ip4/127.0.0.1/tcp/0/ws")]
        )
        
        async with host.run():
            # Get JS node address (this would be parsed from JS node output)
            js_multiaddr = Multiaddr("/ip4/127.0.0.1/tcp/8080/ws/p2p/QmJS...")  # Example
            
            # Connect to JS node
            from libp2p.peer.peerinfo import info_from_p2p_addr
            peer_info = info_from_p2p_addr(js_multiaddr)
            await host.connect(peer_info)
            
            # Test ping protocol
            from libp2p.custom_types import TProtocol
            ping_protocol = TProtocol("/ipfs/ping/1.0.0")
            
            stream = await host.new_stream(peer_info.peer_id, [ping_protocol])
            ping_data = b"ping test"
            await stream.write(ping_data)
            
            response = await stream.read(len(ping_data))
            await stream.close()
            
            assert response == ping_data, f"Expected {ping_data}, got {response}"
            print("✅ Python to JS WebSocket test passed!")
    
    async def cleanup(self):
        """Clean up test processes"""
        if self.js_node_process:
            self.js_node_process.terminate()
            try:
                self.js_node_process.wait(timeout=5)
            except subprocess.TimeoutExpired:
                self.js_node_process.kill()
                self.js_node_process.wait()
        
        # Clean up temp directory
        import shutil
        shutil.rmtree(self.temp_dir, ignore_errors=True)

@pytest.mark.trio
async def test_websocket_interop():
    """Test WebSocket interop between Python and JavaScript"""
    runner = InteropTestRunner()
    try:
        await runner.test_python_to_js_websocket()
    finally:
        await runner.cleanup()

if __name__ == "__main__":
    trio.run(test_websocket_interop)

4. Docker Deployment Example

What's Missing: Production deployment configuration with Docker.

Python Implementation Guide:

# Dockerfile
FROM python:3.11-slim

WORKDIR /app

# Install system dependencies
RUN apt-get update && apt-get install -y \
    build-essential \
    && rm -rf /var/lib/apt/lists/*

# Copy requirements
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Copy application
COPY . .

# Expose WebSocket ports
EXPOSE 8080 8443

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
    CMD python -c "import requests; requests.get('http://localhost:8080/health')" || exit 1

# Run application
CMD ["python", "examples/chat_websocket/main.py"]

# docker-compose.yml
version: '3.8'

services:
  chat-node-1:
    build: .
    ports:
      - "8080:8080"
      - "8443:8443"
    environment:
      - NODE_NAME=node-1
      - LOG_LEVEL=INFO
    volumes:
      - ./certs:/app/certs
    networks:
      - libp2p-network

  chat-node-2:
    build: .
    ports:
      - "8081:8080"
      - "8444:8443"
    environment:
      - NODE_NAME=node-2
      - LOG_LEVEL=INFO
    volumes:
      - ./certs:/app/certs
    networks:
      - libp2p-network

  nginx:
    image: nginx:alpine
    ports:
      - "80:80"
      - "443:443"
    volumes:
      - ./nginx.conf:/etc/nginx/nginx.conf
      - ./certs:/etc/nginx/certs
    depends_on:
      - chat-node-1
      - chat-node-2
    networks:
      - libp2p-network

networks:
  libp2p-network:
    driver: bridge

Implementation Priority

High Priority

1. Real-World Examples - Essential for validation and testing
2. WSS Testing - Critical for secure WebSocket functionality
3. Browser Integration - Essential for real-world adoption
4. Interop Testing - Critical for cross-language compatibility
5. Production Chat Application - Validate end-to-end functionality

Medium Priority

6. Proxy Support - Essential for production use
7. Handshake Timeout - Critical for reliability
8. Concurrent Connection Management - Required for scalability
9. Error Handling - Essential for robustness
10. Multiaddr Resolution - Important for flexibility

Low Priority

11. Listener Address Management - Needed for proper addressing
12. Advanced TLS Configuration - Required for security
13. Zero-byte Write Handling - Edge case testing
14. AutoTLS Integration - Nice to have for browser support
15. Connection State Management - Optimization
16. Production Deployment Examples - Important for real-world usage

Conclusion

The Python WebSocket implementation has a solid foundation but lacks several critical production features present in the Go implementation. The missing features primarily focus on:

• Cross-Language Compatibility: Failing interop tests with JavaScript and other languages
• Real-World Validation: Missing production examples and browser integration
• Production Readiness: Proxy support, timeout handling, error recovery
• Scalability: Concurrent connection management, state tracking
• Security: Advanced TLS configuration, certificate management
• Reliability: Comprehensive error handling, edge case testing
• Adoption: Lack of real-world examples and deployment guides

Critical Gaps:

1. Interop Testing: JavaScript tests are skipped, no cross-language validation
2. Real-World Examples: No browser integration, AutoTLS, or production chat apps
3. Production Features: Missing proxy support, advanced timeouts, error recovery

Implementing these features would bring the Python implementation to parity with the Go implementation and make it suitable for production use and real-world adoption.

[yashksaini-coder]

@acul71 This is a great discussion page, much better and focused. I've presented a timeline of changes on websocket support here #919

[acul71]

@yashksaini-coder Do you want to collaborate on those issues ?
PR here: #938
Let's wait for @seetadev view on PR #781 (comment)

[yashksaini-coder]

Yes I would like that very much 👍🏼