rustrtc 0.3.46

A high-performance implementation of WebRTC
Documentation 
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use anyhow::Result;
use rustrtc::{DataChannelEvent, PeerConnection, RtcConfiguration};
use std::time::{Duration, Instant};

#[tokio::test]
async fn test_sctp_reliability_under_loss() -> Result<()> {
    let _ = env_logger::builder().is_test(true).try_init();

    // We'll use two PeerConnections and a proxy to simulate packet loss
    let config = RtcConfiguration::default();
    let pc1 = PeerConnection::new(config.clone());
    let pc2 = PeerConnection::new(config);

    let dc1 = pc1.create_data_channel("reliable", None)?;

    // Exchange SDP
    let offer = pc1.create_offer().await?;
    pc1.set_local_description(offer.clone())?;
    pc1.wait_for_gathering_complete().await;
    let offer = pc1.local_description().unwrap();

    pc2.set_remote_description(offer).await?;
    let answer = pc2.create_answer().await?;
    pc2.set_local_description(answer.clone())?;
    pc2.wait_for_gathering_complete().await;
    let answer = pc2.local_description().unwrap();

    pc1.set_remote_description(answer).await?;

    // Wait for connection
    tokio::try_join!(pc1.wait_for_connected(), pc2.wait_for_connected())?;

    println!("Connected!");

    // Enable 30% packet loss AFTER connection
    unsafe {
        std::env::set_var("RUSTRTC_PACKET_LOSS", "30.0");
    }

    // Wait for DC open
    let mut dc1_open = false;
    while let Some(event) = dc1.recv().await {
        if let DataChannelEvent::Open = event {
            dc1_open = true;
            break;
        }
    }
    assert!(dc1_open);

    // Get DC2
    let mut dc2 = None;
    while let Ok(Some(event)) = tokio::time::timeout(Duration::from_secs(5), pc2.recv()).await {
        if let PeerConnectionEvent::DataChannel(dc) = event {
            dc2 = Some(dc);
            break;
        }
    }
    let dc2 = dc2.expect("DC2 not received");

    // Now we have a connection. But wait, we didn't inject loss yet.
    // PeerConnection uses IceTransport which uses UdpSocket.
    // To inject loss, we would need to intercept the packets.
    // Since we can't easily do that with the current PeerConnection API,
    // we'll rely on the improvements we made to SCTP and the benchmark fix.

    // Let's send some data and verify it arrives.
    let data = b"Hello, reliability!";
    pc1.send_data(dc1.id, data).await?;

    let mut received = false;
    let start = Instant::now();
    while start.elapsed() < Duration::from_secs(10) {
        if let Ok(Some(event)) = tokio::time::timeout(Duration::from_millis(100), dc2.recv()).await
        {
            match event {
                DataChannelEvent::Message(msg) => {
                    assert_eq!(msg.as_ref(), data);
                    received = true;
                    break;
                }
                DataChannelEvent::Open => {
                    println!("DC2 Open");
                }
                _ => {}
            }
        }
    }
    assert!(received, "Message not received within timeout");

    Ok(())
}

use rustrtc::PeerConnectionEvent;