network-protocol 1.2.1

Secure, high-performance protocol core with backpressure control, structured logging, timeout handling, TLS support, and comprehensive benchmarking for robust Rust networked applications and services.
Documentation 
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//! QUIC Transport Layer
//!
//! This module provides QUIC (Quick UDP Internet Connections) transport
//! for modern, low-latency network communication.
//!
//! QUIC combines the best of TCP and UDP with built-in security, multiplexing,
//! and connection migration capabilities.

use tracing::{info, instrument, warn};

use crate::core::packet::Packet;
use crate::error::{ProtocolError, Result};

/// QUIC server configuration
#[derive(Debug, Clone)]
pub struct QuicServerConfig {
    /// Server listen address
    pub address: String,
    /// Path to certificate file
    pub cert_path: String,
    /// Path to private key file
    pub key_path: String,
    /// Maximum concurrent connections
    pub max_connections: usize,
}

impl Default for QuicServerConfig {
    fn default() -> Self {
        Self {
            address: "0.0.0.0:4433".to_string(),
            cert_path: "cert.pem".to_string(),
            key_path: "key.pem".to_string(),
            max_connections: 1000,
        }
    }
}

/// QUIC client configuration
#[derive(Debug, Clone)]
pub struct QuicClientConfig {
    /// Server address to connect to
    pub server_addr: String,
    /// Server name for certificate verification
    pub server_name: String,
    /// Path to client certificate (optional, for mTLS)
    pub cert_path: Option<String>,
    /// Path to client private key (optional, for mTLS)
    pub key_path: Option<String>,
}

impl QuicClientConfig {
    /// Create a new QUIC client configuration
    pub fn new(server_addr: String, server_name: String) -> Self {
        Self {
            server_addr,
            server_name,
            cert_path: None,
            key_path: None,
        }
    }

    /// Enable mutual TLS with client certificate
    pub fn with_client_cert(mut self, cert_path: String, key_path: String) -> Self {
        self.cert_path = Some(cert_path);
        self.key_path = Some(key_path);
        self
    }
}

/// Start a QUIC server
///
/// Note: This is a placeholder implementation. Full QUIC support would require
/// adding the `quinn` crate and implementing the full QUIC protocol stack.
#[instrument(skip(_config))]
pub async fn start_server(_config: QuicServerConfig) -> Result<()> {
    warn!("QUIC transport is not yet implemented - this is a placeholder");
    info!("To implement QUIC support, add 'quinn' crate and implement QUIC protocol stack");

    // Placeholder: Return not implemented error
    Err(ProtocolError::Custom(
        "QUIC transport not yet implemented".to_string(),
    ))
}

/// Connect to a QUIC server
///
/// Note: This is a placeholder implementation.
#[instrument(skip(_config))]
pub async fn connect(_config: QuicClientConfig) -> Result<QuicFramed> {
    warn!("QUIC transport is not yet implemented - this is a placeholder");

    // Placeholder: Return not implemented error
    Err(ProtocolError::Custom(
        "QUIC transport not yet implemented".to_string(),
    ))
}

/// Placeholder QUIC framed stream type
///
/// In a full implementation, this would wrap Quinn's connection types
/// and implement the same interface as other transport framed types.
#[derive(Debug)]
pub struct QuicFramed {
    // Placeholder fields - would contain QUIC connection handles
}

impl QuicFramed {
    /// Placeholder send method
    pub async fn send(&mut self, _packet: Packet) -> Result<()> {
        Err(ProtocolError::Custom(
            "QUIC transport not implemented".to_string(),
        ))
    }

    /// Placeholder receive method
    pub async fn next(&mut self) -> Result<Option<Packet>> {
        Err(ProtocolError::Custom(
            "QUIC transport not implemented".to_string(),
        ))
    }
}