diff --git a/.gitignore b/.gitignore index 133625a..87c1668 100644 --- a/.gitignore +++ b/.gitignore @@ -1,3 +1,13 @@ +# Nix +result +result-* + +# Rust +target/ +**/*.rs.bk +*.pdb +debug/ + .idea/ certs/ *.pem @@ -20,3 +30,12 @@ target # MSVC Windows builds of rustc generate these, which store debugging information *.pdb + +bin/ +vendor/ +node_modules/ + +cover.out +*.wasm + +*~ diff --git a/.vscode/settings.json b/.vscode/settings.json new file mode 100644 index 0000000..c0311bc --- /dev/null +++ b/.vscode/settings.json @@ -0,0 +1,7 @@ +{ + "rust-analyzer.linkedProjects": [ + "webrtc\\webrtc-rs-server\\Cargo.toml", + "webrtc\\str0m-server\\Cargo.toml", + "websocket\\tungstenite-server\\Cargo.toml" + ] +} \ No newline at end of file diff --git a/README.md b/README.md index d2b60fc..d13a75a 100644 --- a/README.md +++ b/README.md @@ -1,8 +1,8 @@ # realtime-web-comparison -Experimenting with WebSocket, WebRTC, and WebTransport by streaming 2500 coordinates from server to client to visualize. +Experimenting with Server Sent Events, WebSocket, WebRTC, and WebTransport by streaming 2500 coordinates from server to client to visualize. -# NOTE: This repository is currently in flux. -- The WebTransport server currently does not work, however WebSockets and the WebRTC datachannels do +# NOTE: This repository is currently in flux. +- The WebTransport server currently does not work - We're doing our best to update all code to the latest versions of their dependencies. **Additional notes:** @@ -11,14 +11,37 @@ Experimenting with WebSocket, WebRTC, and WebTransport by streaming 2500 coordin - No limits were specified on packet size or how protocols buffer packets. +The pseudo code of what each test is doing looks somewhat like this: + +```go +for i := 10; i < 510; i += 10 { + for j := 10; j < 510; j += 10 { + message := fmt.Sprintf("%d,%d", j, i) + if err := conn.WriteMessage(websocket.TextMessage, []byte(message)); err != nil { + log.Fatal(err) + } + time.Sleep(1 * time.Millisecond) + } +} +``` + +## TODO +- [Add more options for each network connection type](https://github.com/pion/realtime-web-comparison/issues/6) +- Add more libraries to test. + ## Dependencies +- Server Sent Events + - [tmaxmax/go-sse](https://github.com/tmaxmax/go-sse) + - [tokio-rs/axum](https://github.com/tokio-rs/axum) - WebSockets - [gorilla/websocket](https://github.com/gorilla/websocket) + - [snapview/tungstenite-rs](https://github.com/snapview/tungstenite-rs) - WebRTC - [pion/webrtc](https://github.com/pion/webrtc) + - [algesten/str0m](https://github.com/algesten/str0m) - WebTransport - [adriancable/webtransport-go](https://github.com/adriancable/webtransport-go) -- Client is written in pure HTML/CSS/JS. +- Client is written in pure HTML/CSS/JS. - For CSS: [Bootstrap](https://getbootstrap.com/) - The chart visualization is done using [Chart.js](https://www.chartjs.org/). @@ -30,12 +53,16 @@ Experimenting with WebSocket, WebRTC, and WebTransport by streaming 2500 coordin cd realtime-web-comparison ``` -2. Create locally trusted certs using [mkcert](https://github.com/FiloSottile/mkcert) - ```bash - mkdir certs && cd certs - mkcert -install - mkcert localhost - ``` +2. Create locally trusted certs using [mkcert](https://github.com/FiloSottile/mkcert) + ```bash + mkdir certs && cd certs + mkcert -install + mkcert localhost + ``` + If using Nix flakes (see [Nix Setup Flakes](#nix-setup) section above): + ```bash + nix run .#setup-certs + ``` 3. Run a server (use similar commands for `webtransport` and `webrtc`) ```bash @@ -46,10 +73,47 @@ Experimenting with WebSocket, WebRTC, and WebTransport by streaming 2500 coordin ```bash sudo tc qdisc add dev lo root netem loss 15% ``` - + 5. Run client ```bash ./run.sh client chromium --origin-to-force-quic-on=localhost:8001 http://localhost:3000 ``` +## Nix Setup + +This repository includes a Nix flake for reproducible development environments. The flake provides all necessary dependencies including Rust, Go, OpenSSL, and mkcert. + +### Development Shell + +Enter the development shell to get all tools in your PATH: + +```bash +nix develop +``` + +This provides: +- Rust toolchain (rustc, cargo, rustfmt, clippy, rust-analyzer) +- Go toolchain +- OpenSSL with proper environment variables configured +- mkcert for certificate generation +- NSS tools (for Firefox support on Linux) + +### Setting Up Certificates + +Use the Nix task to automatically set up locally trusted certificates: + +```bash +nix run .#setup-certs +``` + +The `setup-certs` task will: +- Create the `certs/` directory if it doesn't exist +- Install the local CA certificate in your system trust store +- Generate a certificate for `localhost` + +### Available Tasks + +- `nix run .#setup-certs` - Set up development certificates using mkcert + +Note: you might need to run `nix develop -c mkcert -install` and restart your browsers. \ No newline at end of file diff --git a/client/static/index.html b/client/static/index.html index 5191e47..a78cd5b 100644 --- a/client/static/index.html +++ b/client/static/index.html @@ -20,6 +20,7 @@ + @@ -41,4 +42,5 @@
Stats
+ diff --git a/client/static/js/common.js b/client/static/js/common.js index 10e4937..01929db 100644 --- a/client/static/js/common.js +++ b/client/static/js/common.js @@ -26,6 +26,12 @@ export let chart = new Chart(chartContext, { showLine: true, borderDash: [2, 5], }, + { + data: [], + label: "Server Sent Events", + borderColor: "#000000ff", + showLine: true, + } ] }, options: { diff --git a/client/static/js/sse.js b/client/static/js/sse.js new file mode 100644 index 0000000..c057b88 --- /dev/null +++ b/client/static/js/sse.js @@ -0,0 +1,50 @@ +import {chart, initCanvas, visualizePacket} from "./common.js"; + +const sseBtn = document.getElementById("sse"); +const serverUrl = "http://localhost:7999"; + +sseBtn.onclick = (_) => { + initCanvas() + console.info(`Connecting to Server Sent Events server at ${serverUrl} ...`); + + let t0 = new Date(); + let messageCount = 0; + const eventSource = new EventSource(serverUrl); + + eventSource.onopen = (_) => { + console.info(`Connection established in ${new Date() - t0} ms.`); + sseBtn.disabled = true + t0 = new Date(); + chart.data.datasets[3].data.push({x: 0, y: 0}); + } + + eventSource.onmessage = (e) => { + messageCount += 1; + visualizePacket(e.data); + if (new Date() - t0 - chart.data.datasets[3].data.at(-1).x > 200) { + chart.data.datasets[3].data.push({x: new Date() - t0, y: messageCount}); + chart.update(); + } + + // Check if we've received all messages (2500 total: 50x50) + if (messageCount >= 2500) { + eventSource.close(); + console.info(`${messageCount} message(s) were received within ${new Date() - t0} ms.`) + console.info('All messages received. Disconnected from Server Sent Events server.'); + sseBtn.disabled = false; + } + } + + eventSource.onerror = (err) => { + console.error('SSE connection error:', err); + eventSource.close(); + sseBtn.disabled = false; + + if (messageCount > 0) { + // Connection dropped mid-stream + chart.data.datasets[3].data.push({x: new Date() - t0, y: messageCount}); + chart.update(); + console.info(`Connection interrupted. ${messageCount} message(s) were received within ${new Date() - t0} ms.`) + } + } +} diff --git a/client/static/js/webrtc.js b/client/static/js/webrtc.js index 4b14837..6680c90 100644 --- a/client/static/js/webrtc.js +++ b/client/static/js/webrtc.js @@ -21,11 +21,11 @@ webRTCBtn.onclick = (_) => { conn.onconnectionstatechange = () => { console.info(`WebRTC Connection State: ${conn.connectionState}`); }; - + conn.oniceconnectionstatechange = () => { console.info(`ICE Connection State: ${conn.iceConnectionState}`); }; - + conn.onicegatheringstatechange = () => { console.info(`ICE Gathering State: ${conn.iceGatheringState}`); }; @@ -61,14 +61,28 @@ webRTCBtn.onclick = (_) => { console.info(`WebRTC DataChannel established in ${new Date() - t0} ms.`); }; - dataChannel.onmessage = (e) => { + dataChannel.onmessage = async (e) => { if (messageCount === 0) { webRTCBtn.disabled = true; t0 = new Date(); chart.data.datasets[2].data.push({x: 0, y: 0}); } messageCount += 1; - visualizePacket(decoder.decode(e.data)); + let decoded; + if (typeof e.data === 'string') { + decoded = e.data; + } else if (e.data instanceof Blob) { + const buffer = await e.data.arrayBuffer(); + decoded = decoder.decode(buffer); + } else if (e.data instanceof ArrayBuffer) { + decoded = decoder.decode(e.data); + } else if (e.data instanceof Uint8Array || e.data instanceof DataView) { + decoded = decoder.decode(e.data); + } else { + // fallback: try to convert to string + decoded = String(e.data); + } + visualizePacket(decoded); if (new Date() - t0 - chart.data.datasets[2].data.at(-1).x > 200) { chart.data.datasets[2].data.push({x: new Date() - t0, y: messageCount}); chart.update(); diff --git a/flake.lock b/flake.lock new file mode 100644 index 0000000..dddda94 --- /dev/null +++ b/flake.lock @@ -0,0 +1,61 @@ +{ + "nodes": { + "flake-utils": { + "inputs": { + "systems": "systems" + }, + "locked": { + "lastModified": 1731533236, + "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=", + "owner": "numtide", + "repo": "flake-utils", + "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b", + "type": "github" + }, + "original": { + "owner": "numtide", + "repo": "flake-utils", + "type": "github" + } + }, + "nixpkgs": { + "locked": { + "lastModified": 1762111121, + "narHash": "sha256-4vhDuZ7OZaZmKKrnDpxLZZpGIJvAeMtK6FKLJYUtAdw=", + "owner": "NixOS", + "repo": "nixpkgs", + "rev": "b3d51a0365f6695e7dd5cdf3e180604530ed33b4", + "type": "github" + }, + "original": { + "owner": "NixOS", + "ref": "nixos-unstable", + "repo": "nixpkgs", + "type": "github" + } + }, + "root": { + "inputs": { + "flake-utils": "flake-utils", + "nixpkgs": "nixpkgs" + } + }, + "systems": { + "locked": { + "lastModified": 1681028828, + "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=", + "owner": "nix-systems", + "repo": "default", + "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e", + "type": "github" + }, + "original": { + "owner": "nix-systems", + "repo": "default", + "type": "github" + } + } + }, + "root": "root", + "version": 7 +} diff --git a/flake.nix b/flake.nix new file mode 100644 index 0000000..ce7a281 --- /dev/null +++ b/flake.nix @@ -0,0 +1,72 @@ +{ + description = "Real-time web comparison project with SSE, WebSocket, WebRTC, and WebTransport"; + + inputs = { + nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable"; + flake-utils.url = "github:numtide/flake-utils"; + }; + + outputs = { self, nixpkgs, flake-utils }: + flake-utils.lib.eachDefaultSystem (system: + let + pkgs = import nixpkgs { + inherit system; + }; + setup-certs = pkgs.writeShellScriptBin "setup-certs" '' + set -e + echo "Setting up locally trusted certificates..." + + REPO_ROOT="$(pwd)" + CERT_DIR="$REPO_ROOT/certs" + + # Create certs directory if it doesn't exist + mkdir -p "$CERT_DIR" + + echo "Installing local CA..." + ${pkgs.mkcert}/bin/mkcert -install + + echo "Generating certificate for localhost in $CERT_DIR..." + cd "$CERT_DIR" + ${pkgs.mkcert}/bin/mkcert localhost + cd "$REPO_ROOT" + + echo "ertificates created successfully!" + echo "Certificate files are in: $CERT_DIR" + ls -la "$CERT_DIR"/*.pem 2>/dev/null || echo " (checking certificate files...)" + ''; + in + { + devShells.default = pkgs.mkShell { + buildInputs = with pkgs; [ + rustc + cargo + rustfmt + clippy + rust-analyzer + go + openssl + pkg-config + git + mkcert + nss.tools + ]; + + OPENSSL_DIR = "${pkgs.openssl.dev}"; + OPENSSL_LIB_DIR = "${pkgs.openssl.out}/lib"; + OPENSSL_INCLUDE_DIR = "${pkgs.openssl.dev}/include"; + + PKG_CONFIG_PATH = "${pkgs.openssl.dev}/lib/pkgconfig"; + }; + + apps.default = 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get(sse_handler)); + let listener = tokio::net::TcpListener::bind("0.0.0.0:7999").await.unwrap(); + axum::serve(listener, app).await.unwrap(); +} + +async fn sse_handler() -> Sse>> { + Sse::new(stream! { + // Send message so we can test the server performance + for i in (10..=510).step_by(10) { + for j in (10..=510).step_by(10) { + let message = format!("{j},{i}"); + yield Ok(Event::default().data::(message)); + std::thread::sleep(std::time::Duration::from_millis(1)); + } + } + println!("All messages sent."); + }) +} diff --git a/server-sent-events/go-sse/go.mod b/server-sent-events/go-sse/go.mod new file mode 100644 index 0000000..6d173e5 --- /dev/null +++ b/server-sent-events/go-sse/go.mod @@ -0,0 +1,5 @@ +module eventsource + +go 1.25.3 + +require github.com/tmaxmax/go-sse v0.11.0 // indirect diff --git a/server-sent-events/go-sse/go.sum b/server-sent-events/go-sse/go.sum new file mode 100644 index 0000000..bbc5a77 --- /dev/null +++ b/server-sent-events/go-sse/go.sum @@ -0,0 +1,2 @@ +github.com/tmaxmax/go-sse v0.11.0 h1:nogmJM6rJUoOLoAwEKeQe5XlVpt9l7N82SS1jI7lWFg= +github.com/tmaxmax/go-sse v0.11.0/go.mod h1:u/2kZQR1tyngo1lKaNCj1mJmhXGZWS1Zs5yiSOD+Eg8= diff --git a/server-sent-events/go-sse/main.go b/server-sent-events/go-sse/main.go new file mode 100644 index 0000000..159d5c9 --- /dev/null +++ b/server-sent-events/go-sse/main.go @@ -0,0 +1,57 @@ +package main + +import ( + "fmt" + "log" + "net/http" + "time" + + "github.com/tmaxmax/go-sse" +) + +func main() { + mux := http.NewServeMux() + sseHandler := &sse.Server{} + + sseHandler.OnSession = func(w http.ResponseWriter, r *http.Request) (topics []string, allowed bool) { + log.Printf("Client Connected\n") + + // Set CORS headers to allow requests from localhost:3000 + w.Header().Set("Access-Control-Allow-Origin", "*") + w.Header().Set("Access-Control-Allow-Methods", "GET, OPTIONS") + w.Header().Set("Access-Control-Allow-Headers", "Content-Type") + + // Start a goroutine to send messages + go func() { + for i := 10; i < 510; i += 10 { + for j := 10; j < 510; j += 10 { + ev := &sse.Message{} + message := fmt.Sprintf("%03d,%03d", j, i) + ev.AppendData(message) + var err = sseHandler.Publish(ev) + if err != nil { + log.Printf("Error publishing message: %v\n", err) + return + } + time.Sleep(1 * time.Millisecond) + } + } + log.Printf("Finished sending all messages\n") + }() + + // Return empty topics to subscribe to default/all messages + return []string{}, true + } + + server := &http.Server{ + Addr: ":7999", + Handler: mux, + } + + mux.Handle("/", sseHandler) + + //nolint:gosec // Use http.Server in your code instead, to be able to set timeouts. + if err := server.ListenAndServe(); err != nil { + log.Fatalln(err) + } +} diff --git a/webrtc/str0m-server/.cargo/config.toml b/webrtc/str0m-server/.cargo/config.toml new file mode 100644 index 0000000..d707ff2 --- /dev/null +++ b/webrtc/str0m-server/.cargo/config.toml @@ -0,0 +1,3 @@ +[target.x86_64-pc-windows-msvc] +linker = "rust-lld" +rustflags = 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= "0.1.0" +edition = "2024" + +[dependencies] +anyhow = "1.0.100" +bytes = "1.10.1" +crossbeam-channel = "0.5.15" +futures-util = "0.3.31" +if-addrs = "0.14.0" +mimalloc = { version = "0.1", default-features = false } +rustls = { version = "0.23.35", features = ["ring"] } +rustls-pemfile = "2.2.0" +rustls-pki-types = "1.13.0" +serde = { version = "1.0.228", features = ["derive"] } +serde_json = "1.0.145" +socket2 = "0.6.1" +tokio = { version = "1.48.0", features = ["macros", "net", "rt", "rt-multi-thread", "sync", "time"] } +tokio-rustls = "0.26.4" +tokio-tungstenite = { version = "0.28.0", features = ["tokio-rustls"] } + +[features] +mimalloc = [] + + +[target.'cfg(windows)'.dependencies] +windows = { version = "0.62.2", features = ["Win32_Media_Multimedia"] } +winapi = { version = "0.3", features = ["winbase", "winsock2", "ws2tcpip"] } +tracing = { version = "0.1.41", features = ["async-await"] } +tracing-subscriber = { version = "0.3.20", features = ["env-filter"] } + +[target.'cfg(not(target_os = "windows"))'.dependencies] +str0m = { version = "0.11.1", default-features = false, features = ["openssl"] } + +[target.'cfg(target_os = "windows")'.dependencies] +str0m = { version = "0.11.1", default-features = false, features = ["wincrypto"] } diff --git a/webrtc/str0m-server/src/main.rs b/webrtc/str0m-server/src/main.rs new file mode 100644 index 0000000..f80bbcf --- /dev/null +++ b/webrtc/str0m-server/src/main.rs @@ -0,0 +1,752 @@ +// str0m test server with a single tokio::select! loop (WS, UDP, timer) +// should keeps the WebSocket/TLS flow unchanged as other clients. tested on Windows & Linux by. +// doesn't work on firefox on windows (dtls handshake fails). +use std::error::Error; +use std::net::{IpAddr, Ipv4Addr, SocketAddr}; +use std::path::Path; +use std::sync::Arc; +use std::time::{Duration, Instant}; +use socket2::SockRef; +use crossbeam_channel as cb; +use futures_util::{SinkExt, StreamExt}; +use if_addrs::get_if_addrs; +use mimalloc::MiMalloc; +use rustls::pki_types::{CertificateDer, PrivateKeyDer}; +use serde::{Deserialize, Serialize}; +use str0m::net::{Protocol, Receive}; +use str0m::{Candidate, Event, Input, Output}; +use tokio::net::{TcpListener, UdpSocket}; +use tokio::time::{sleep_until, Instant as TokioInstant}; +use tokio_rustls::{server::TlsStream, TlsAcceptor}; +use tokio_tungstenite::{accept_async, tungstenite::Message}; + +#[global_allocator] +static GLOBAL: MiMalloc = MiMalloc; + + +#[derive(Deserialize, Debug)] +#[serde(tag = "type")] +enum WsInbound { + #[serde(rename = "offer")] + Offer { sdp: String }, + #[serde(rename = "candidate")] + Candidate { + candidate: String, + #[serde(rename = "sdpMid")] + #[allow(dead_code)] + sdp_mid: Option, + #[serde(rename = "sdpMLineIndex")] + #[allow(dead_code)] + sdp_m_line_index: Option, + }, + #[serde(rename = "endOfCandidates")] + EndOfCandidates {}, +} + +#[derive(Debug, Serialize)] +#[serde(tag = "type")] +#[allow(dead_code)] +enum WsOutbound { + #[serde(rename = "answer")] + Answer { sdp: String }, + #[serde(rename = "candidate")] + Candidate { + candidate: String, + #[serde(rename = "sdpMid")] + sdp_mid: Option, + #[serde(rename = "sdpMLineIndex")] + sdp_m_line_index: Option, + }, + #[serde(rename = "endOfCandidates")] + EndOfCandidates {}, +} + +#[tokio::main] +async fn main() -> anyhow::Result<()> { + rustls::crypto::CryptoProvider::install_default(rustls::crypto::ring::default_provider()) + .map_err(|_| anyhow::anyhow!("Failed to install rustls ring provider"))?; + + let cert_path = Path::new("../../certs/localhost.pem"); + let key_path = Path::new("../../certs/localhost-key.pem"); + let cert_pem = std::fs::read(cert_path)?; + let key_pem = std::fs::read(key_path)?; + let cert = rustls_pemfile::certs(&mut &cert_pem[..]) + .next() + .ok_or_else(|| anyhow::anyhow!("no certificate found"))? + .map(CertificateDer::from)?; + let key = rustls_pemfile::pkcs8_private_keys(&mut &key_pem[..]) + .next() + .ok_or_else(|| anyhow::anyhow!("no private key found"))? + .map(PrivateKeyDer::from)?; + let rustls_cfg = rustls::ServerConfig::builder() + .with_no_client_auth() + .with_single_cert(vec![cert], key)?; + let acceptor = TlsAcceptor::from(Arc::new(rustls_cfg)); + + let listener = TcpListener::bind("127.0.0.1:8002").await?; + eprintln!("Listening on wss://127.0.0.1:8002"); + + loop { + let (tcp, _) = listener.accept().await?; + let acceptor = acceptor.clone(); + + tokio::spawn(async move { + if let Err(e) = handle_client(acceptor, tcp).await { + eprintln!("Client error: {e:?}"); + } + }); + } +} + +// This function handles one WebRTC connection from start to finish +async fn handle_client( + acceptor: TlsAcceptor, + tcp: tokio::net::TcpStream, +) -> anyhow::Result<()> { + let tls: TlsStream<_> = acceptor.accept(tcp).await?; + let mut ws = accept_async(tls).await?; + + let first_msg = ws.next().await.ok_or_else(|| anyhow::anyhow!("client closed"))??; + let offer = match first_msg { + Message::Text(t) => serde_json::from_str::(&t)?, + Message::Binary(b) => serde_json::from_slice::(&b)?, + _ => anyhow::bail!("unexpected first WS message"), + }; + let offer_sdp = match offer { + WsInbound::Offer { sdp } => sdp, + _ => anyhow::bail!("first message must be an offer"), + }; + + let bind_ip = pick_bind_v4_for_offer(&offer_sdp); + + let udp = UdpSocket::bind(SocketAddr::new(IpAddr::V4(bind_ip), 0)).await?; + let local_udp = udp.local_addr()?; + eprintln!("UDP bound to: {local_udp}"); + + let std_udp = udp.into_std()?; + + SockRef::from(&std_udp).set_send_buffer_size(20 * 1024 * 1024)?; + + #[cfg(windows)] + { + use std::os::windows::io::AsRawSocket; + use winapi::shared::minwindef::{DWORD, LPVOID}; + use winapi::um::winsock2::{setsockopt, SO_SNDBUF, SOL_SOCKET, SOCKET_ERROR, WSAGetLastError, WSAIoctl}; + + // SIO_UDP_CONNRESET = _WSAIOW(IOC_VENDOR, 12) = 0x9800000C + const SIO_UDP_CONNRESET: DWORD = 0x9800000C; + + let socket = std_udp.as_raw_socket(); + let buffer_size: i32 = 40 * 1024 * 1024; + let result = unsafe { + setsockopt( + socket as _, + SOL_SOCKET, + SO_SNDBUF, + &buffer_size as *const _ as *const _, + std::mem::size_of::() as _, + ) + }; + if result == SOCKET_ERROR { + let err = unsafe { WSAGetLastError() }; + eprintln!("Warning: Failed to set UDP send buffer size, error: {}", err); + } else { + eprintln!("Set UDP send buffer to {} bytes", buffer_size); + } + + // disable spurious UDP connection reset errors on Windows + let mut bytes_returned: DWORD = 0; + let mut enable: u32 = 0; + + let rc = unsafe { + WSAIoctl( + socket as _, + SIO_UDP_CONNRESET, + &mut enable as *mut _ as LPVOID, + std::mem::size_of::() as DWORD, + std::ptr::null_mut(), + 0, + &mut bytes_returned as *mut _, + std::ptr::null_mut(), + None, + ) + }; + if rc == SOCKET_ERROR { + eprintln!("Warning: failed to set SIO_UDP_CONNRESET"); + } else { + eprintln!("Disabled UDP connection reset errors (SIO_UDP_CONNRESET)"); + } + } + + let got = SockRef::from(&std_udp).send_buffer_size()?; + eprintln!("SO_SNDBUF set; effective size = {} bytes", got); + + let std_udp_arc = Arc::new(std_udp); + + let (ws_to_rtc_tx, ws_to_rtc_rx) = cb::unbounded::(); + let (udp_to_rtc_tx, udp_to_rtc_rx) = cb::unbounded::(); + let (timeout_tx, timeout_rx) = cb::unbounded::<()>(); + let (next_to_async_tx, next_to_async_rx) = cb::unbounded::(); + let (answer_tx, answer_rx) = cb::unbounded::(); + + let std_udp_for_rtc = Arc::clone(&std_udp_arc); + let offer_for_rtc = offer_sdp.clone(); + tokio::task::spawn_blocking(move || { + let _ = run_rtc_thread( + offer_for_rtc, + IpAddr::V4(bind_ip), + local_udp.port(), + ws_to_rtc_rx, + udp_to_rtc_rx, + timeout_rx, + next_to_async_tx, + answer_tx, + std_udp_for_rtc, + ); + }); + + let answer = tokio::task::spawn_blocking(move || answer_rx.recv()).await??; + + let answer_obj = serde_json::json!({ "type": "answer", "sdp": answer }); + ws.send(Message::Text(serde_json::to_string(&answer_obj)?.into())) + .await?; + + let udp_recv = { + let cloned = std_udp_arc.as_ref().try_clone()?; + tokio::net::UdpSocket::from_std(cloned)? + }; + + let mut buf = vec![0u8; 2048]; + let local_addr_for_recv = SocketAddr::new(IpAddr::V4(bind_ip), local_udp.port()); + let mut next_deadline = Instant::now() + Duration::from_millis(50); + + loop { + if let Ok(t) = next_to_async_rx.try_recv() { + next_deadline = t; + } + + let mut ws_next = ws.next(); + let sleep_fut = sleep_until(TokioInstant::from_std(next_deadline)); + tokio::pin!(sleep_fut); + + tokio::select! { + // ws candidates + maybe_msg = &mut ws_next => { + match maybe_msg { + Some(Ok(Message::Text(t))) => { + if let Ok(inb) = serde_json::from_str::(&t) { let _ = ws_to_rtc_tx.send(inb); } + } + Some(Ok(Message::Binary(b))) => { + if let Ok(inb) = serde_json::from_slice::(&b) { let _ = ws_to_rtc_tx.send(inb); } + } + Some(Ok(Message::Close(_))) | None | Some(Err(_)) => { break; } + _ => {} + } + } + + // Handle incoming UDP packets (STUN, DTLS, media data) + recv = udp_recv.recv_from(&mut buf) => { + match recv { + Ok((n, src)) => { + if n > 0 { + let data = buf[..n].to_vec(); + let _ = udp_to_rtc_tx.send(UdpIn { buf: data, src, dst: local_addr_for_recv }); + } + } + Err(e) => { + if is_transient_udp_recv_err(&e) { /* ignore */ } + else { eprintln!("UDP receive error (continuing): {e}"); } + } + } + } + + // Timer tick - tell str0m to check for timeouts + _ = &mut sleep_fut => { let _ = timeout_tx.send(()); } + } + } + + Ok(()) +} + +// Simple struct to hold information about incoming UDP packets +#[derive(Debug)] +struct UdpIn { + buf: Vec, + src: SocketAddr, + dst: SocketAddr, +} + +// Check if a UDP receive error is something we can safely ignore +// Windows has some quirks with UDP error handling +fn is_transient_udp_recv_err(_e: &std::io::Error) -> bool { + #[cfg(windows)] + { + _e.kind() == std::io::ErrorKind::ConnectionReset || _e.raw_os_error() == Some(10054) + } + #[cfg(not(windows))] + { + false + } +} + +// Check if this is the weird EINVAL error that happens on Linux +// when we try to send to a non-loopback address from a loopback-bound socket +fn is_send_einval_to_non_loopback(e: &std::io::Error, dest: SocketAddr) -> bool { + if e.raw_os_error() == Some(22) { + if let IpAddr::V4(v4) = dest.ip() { + return !v4.is_loopback(); + } + } + false +} + +// Extract IPv4 addresses from the browser's SDP offer +// We look for "a=candidate" lines and pull out the IP addresses +// This helps us decide which network interface to bind to +fn extract_offer_v4s(sdp: &str) -> Vec { + let mut ips = Vec::new(); + for line in sdp.lines() { + // SDP candidate lines look like: a=candidate:1 1 UDP 12345 192.168.1.100 12345 typ host + if let Some(rest) = line.strip_prefix("a=candidate:") { + let parts: Vec<&str> = rest.split_whitespace().collect(); + if parts.len() >= 6 { + // Skip mDNS hostnames (end with .local) + if !parts[4].ends_with(".local") { + if let Ok(IpAddr::V4(v4)) = parts[4].parse::() { + ips.push(v4); + } + } + } + } + } + ips +} + +// Check how many bits two IP addresses share in common +// This helps us find the best matching network interface +fn same_lan_prefix(a: Ipv4Addr, b: Ipv4Addr) -> u32 { + let ao = a.octets(); + let bo = b.octets(); + if ao == bo { + return 32; // Exact match + } + if ao[0] == bo[0] && ao[1] == bo[1] && ao[2] == bo[2] { + return 24; // Same /24 subnet + } + if ao[0] == bo[0] && ao[1] == bo[1] { + return 16; // Same /16 subnet + } + if ao[0] == bo[0] { + return 8; // Same /8 subnet + } + 0 // No common prefix +} + +// Check if a network interface name suggests it's a virtual/tunnel interface +// We prefer real network interfaces for WebRTC connections +fn if_is_virtual(name: &str) -> bool { + let n = name.to_ascii_lowercase(); + [ + "virtualbox", + "vmware", + "hyper-v", + "wintun", + "tailscale", + "zerotier", + "docker", + "vbox", + "bridge", + "hamachi", + "loopback", + "veth", + ] + .iter() + .any(|k| n.contains(k)) +} + +fn pick_bind_v4_for_offer(offer_sdp: &str) -> Ipv4Addr { + if let Ok(s) = std::env::var("BIND_UDP_IP") { + if let Ok(ip) = s.parse::() { + return ip; + } + } + + let offer_ips = extract_offer_v4s(offer_sdp); + if offer_ips.iter().any(|ip| ip.is_loopback()) { + return Ipv4Addr::LOCALHOST; + } + + let mut best: Option<(u32, Ipv4Addr)> = None; + if let Ok(ifs) = get_if_addrs() { + for i in &ifs { + if let IpAddr::V4(ip) = i.ip() { + if i.is_loopback() || ip.is_loopback() { + continue; + } + if if_is_virtual(&i.name) { + continue; + } + let o = ip.octets(); + let is_rfc1918 = (o[0] == 10) + || (o[0] == 172 && (16..=31).contains(&o[1])) + || (o[0] == 192 && o[1] == 168); + if !is_rfc1918 { + continue; + } + let mut rank = 0; + for off in &offer_ips { + rank = rank.max(same_lan_prefix(ip, *off)); + } + if best.as_ref().map_or(true, |(r, _)| rank > *r) { + best = Some((rank, ip)); + } + } + } + if let Some((_, ip)) = best { + return ip; + } + + for i in ifs { + if let IpAddr::V4(ip) = i.ip() { + if i.is_loopback() || ip.is_loopback() { + continue; + } + if if_is_virtual(&i.name) { + continue; + } + let o = ip.octets(); + let is_rfc1918 = (o[0] == 10) + || (o[0] == 172 && (16..=31).contains(&o[1])) + || (o[0] == 192 && o[1] == 168); + if is_rfc1918 { + return ip; + } + } + } + } + + Ipv4Addr::LOCALHOST +} + +fn run_rtc_thread( + offer_sdp: String, + local_ip: IpAddr, + udp_port: u16, + ws_in: cb::Receiver, + udp_in: cb::Receiver, + timeout_in: cb::Receiver<()>, + next_out: cb::Sender, + answer_out: cb::Sender, + udp_socket: Arc, +) -> anyhow::Result<()> { + let mut rtc = { + #[cfg(windows)] + { + // trying to fix it for firefox on windows? + let cert_opts = str0m::config::DtlsCertOptions { + pkey_type: str0m::config::DtlsPKeyType::Rsa2048, + ..Default::default() + }; + let crypto_provider = str0m::config::CryptoProvider::WinCrypto; + let dtls_cert = str0m::config::DtlsCert::new(crypto_provider, cert_opts); + let str0m_config = str0m::RtcConfig::new() + .set_dtls_cert_config(str0m::DtlsCertConfig::PregeneratedCert(dtls_cert)); + str0m_config.build() + } + #[cfg(not(windows))] + { + str0m::RtcConfig::new().build() + } + }; + + let local_addr = SocketAddr::new(local_ip, udp_port); + let local_candidate = Candidate::host(local_addr, "udp")?; + rtc.add_local_candidate(local_candidate) + .ok_or(anyhow::anyhow!("Failed to add local candidate"))?; + eprintln!("Added local candidate: {local_addr}"); + + let offer = str0m::change::SdpOffer::from_sdp_string(&offer_sdp)?; + let answer = rtc.sdp_api().accept_offer(offer)?; + let answer_sdp = answer.to_sdp_string(); + eprintln!("SDP answer generated"); + + let mut channel_id: Option = None; + let mut messages_to_send: Vec = Vec::new(); + let mut message_index = 0; + let mut backpressure_state = BackpressureState::new(); + + + let (mut next_deadline, _) = drain_outputs(&mut rtc, udp_socket.as_ref(), &mut channel_id, &mut messages_to_send, &mut message_index, &mut backpressure_state)?; + let _ = next_out.send(next_deadline); + + let _ = answer_out.send(answer_sdp); + + loop { + while let Ok(ws_msg) = ws_in.try_recv() { + match ws_msg { + WsInbound::Candidate { candidate, .. } => { + try_add_remote_candidate(&mut rtc, &candidate, local_ip) + } + WsInbound::EndOfCandidates { .. } => eprintln!("EndOfCandidates received"), + _ => {} + } + } + // Drain inbound UDP + while let Ok(UdpIn { buf, src, dst }) = udp_in.try_recv() { + let contents: &[u8] = &buf; + if let Ok(contents_slice) = contents.try_into() { + let input = Input::Receive( + Instant::now(), + Receive { + proto: Protocol::Udp, + source: src, + destination: dst, + contents: contents_slice, + }, + ); + if let Err(e) = rtc.handle_input(input) { + eprintln!("Error handling UDP input: {e:?}"); + if let Some(source) = e.source() { + eprintln!(" Source: {source:?}"); + } + } + } + } + while let Ok(()) = timeout_in.try_recv() { + if let Err(e) = rtc.handle_input(Input::Timeout(Instant::now())) { + eprintln!("Error handling timeout: {e}"); + } + } + + try_write_messages(&mut rtc, &channel_id, &messages_to_send, &mut message_index, &mut backpressure_state); + + let (nd, _connected_state) = drain_outputs(&mut rtc, udp_socket.as_ref(), &mut channel_id, &mut messages_to_send, &mut message_index, &mut backpressure_state)?; + if nd != next_deadline { + next_deadline = nd; + let _ = next_out.send(next_deadline); + } + + // Keep normal sleep time even when sending to avoid overwhelming Windows + std::thread::sleep(Duration::from_millis(1)); + } +} + +struct BackpressureState { + consecutive_errors: usize, + successful_batches: usize, + current_batch_size: usize, +} + +impl BackpressureState { + fn new() -> Self { + let initial = 5; + Self { + consecutive_errors: 0, + successful_batches: 0, + current_batch_size: initial, + } + } + + fn adjust_for_backpressure(&mut self, written: usize, had_error: bool, batch_size: usize) { + if had_error { + self.consecutive_errors += 1; + self.successful_batches = 0; + self.current_batch_size = (self.current_batch_size / 2).max(1); + } else { + self.consecutive_errors = 0; + if written == batch_size && written > 0 { + self.successful_batches += 1; + if self.successful_batches >= 10 && self.current_batch_size < 20 { + self.current_batch_size += 1; + self.successful_batches = 0; + } + } else if written == 0 && batch_size > 1 { + self.current_batch_size = (self.current_batch_size * 2 / 3).max(1); + } + } + } + + fn batch_size(&self) -> usize { + self.current_batch_size + } +} + +fn try_write_messages( + rtc: &mut str0m::Rtc, + channel_id: &Option, + messages_to_send: &[String], + message_index: &mut usize, + backpressure_state: &mut BackpressureState, +) { + if let Some(id) = *channel_id { + if *message_index < messages_to_send.len() { + if let Some(mut ch) = rtc.channel(id) { + let batch_size = backpressure_state.batch_size(); + let mut written = 0; + let mut had_error = false; + + while *message_index < messages_to_send.len() && written < batch_size { + let message = &messages_to_send[*message_index]; + match ch.write(false, message.as_bytes()) { + Ok(bytes_written) => { + if bytes_written == 0 { + had_error = true; + break; + } + *message_index += 1; + written += 1; + } + Err(e) => { + if *message_index > 50 { + eprintln!("Write error at message {}: {:?}", message_index, e); + } + had_error = true; + break; + } + } + } + + backpressure_state.adjust_for_backpressure(written, had_error, batch_size); + } + } else if *message_index == messages_to_send.len() && !messages_to_send.is_empty() { + eprintln!("Finished sending all {} messages", messages_to_send.len()); + *message_index += 1; + } + } +} + +fn drain_outputs( + rtc: &mut str0m::Rtc, + udp_socket: &std::net::UdpSocket, + channel_id: &mut Option, + messages_to_send: &mut Vec, + message_index: &mut usize, + backpressure_state: &mut BackpressureState, +) -> anyhow::Result<(Instant, bool)> { + let mut connected = false; + let mut next_timeout = None; + let mut output_count = 0; + const MAX_OUTPUTS_PER_CALL: usize = 10; // Process fewer outputs to avoid overwhelming + + loop { + match rtc.poll_output()? { + Output::Timeout(t) => { + next_timeout = Some(t); + try_write_messages(rtc, channel_id, messages_to_send, message_index, backpressure_state); + output_count += 1; + if output_count >= MAX_OUTPUTS_PER_CALL { + break; + } + }, + Output::Transmit(tx) => { + if let Err(e) = udp_socket.send_to(&tx.contents, tx.destination) { + if is_send_einval_to_non_loopback(&e, tx.destination) { + continue; + } + eprintln!("UDP send_to error to {}: {}", tx.destination, e); + } + output_count += 1; + if output_count >= MAX_OUTPUTS_PER_CALL { + break; + } + } + Output::Event(ev) => { + match &ev { + Event::IceConnectionStateChange(state) => eprintln!("ICE state: {state:?}"), + Event::Connected => { + eprintln!("WebRTC CONNECTED! ICE and DTLS established."); + connected = true; + } + Event::ChannelOpen(id, label) => { + eprintln!("DataChannel opened: id={id:?}, label={label}"); + if !connected { + eprintln!("Warning: Channel opened but connection not yet established"); + } + *channel_id = Some(*id); + // Generate all messages to send (they will be sent one at a time in the Timeout handler) + if messages_to_send.is_empty() { + eprintln!("Starting to send messages through data channel"); + // Send message so we can test the server performance + // Write messages and continue polling to ensure they're sent + // This is critical on Windows where writes are buffered + // Queue messages instead of writing them all at once + if messages_to_send.is_empty() { + eprintln!("Generating messages to send"); + for i in (10..=510).step_by(10) { + for j in (10..=510).step_by(10) { + messages_to_send.push(format!("{j},{i}")); + } + } + eprintln!("Generated {} messages to send", messages_to_send.len()); + } + } + } + Event::ChannelData(data) => eprintln!("DataChannel received: {data:?}"), + Event::ChannelClose(id) => { + eprintln!("DataChannel closed: id={id:?}"); + *channel_id = None; + } + _ => {} + } + output_count += 1; + if output_count >= MAX_OUTPUTS_PER_CALL { + break; + } + }, + } + } + + let timeout = next_timeout.unwrap_or_else(|| Instant::now() + Duration::from_millis(10)); + Ok((timeout, connected)) +} + +fn try_add_remote_candidate(rtc: &mut str0m::Rtc, candidate: &str, local_ip: IpAddr) { + let line = candidate.trim_start_matches("a=").trim_start_matches("candidate:"); + let parts: Vec<&str> = line.split_whitespace().collect(); + if parts.len() < 6 { + return; + } + if !parts + .get(2) + .map(|s| s.eq_ignore_ascii_case("udp")) + .unwrap_or(false) + { + return; + } + + // ignore mDNS hostnames. + if parts[4].ends_with(".local") { + return; + } + + let ip = match parts.get(4).and_then(|s| s.parse::().ok()) { + Some(IpAddr::V4(v4)) => v4, + _ => return, + }; + let port = match 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b/webrtc/webrtc-rs-server/Cargo.toml @@ -0,0 +1,23 @@ +[package] +name = "webrtc-rs-server" +version = "0.1.0" +edition = "2024" + +[dependencies] +webrtc = "0.14.0" +interceptor = "0.15.0" +tokio = { version = "1", features = ["rt-multi-thread", "macros", "time", "full"] } +serde = { version = "1", features = ["derive"] } +serde_json = "1" +rustls = {version = "0.23", features = ["ring"]} +rustls-pki-types = "1.13.0" +anyhow = "1.0.100" +axum = { version = "0.8.6", features = ["ws"] } +tower = "0.5.2" +tower-http = { version = "0.6.6", features = ["fs", "trace"] } +axum-extra = { version = "0.12.1", features = ["typed-header"] } +tracing-subscriber = { version = "0.3.20", features = ["env-filter"] } +futures-util = { version = "0.3", default-features = false, features = ["sink", "std"] } +tracing = "0.1.41" +axum-server = { version = "0.7.2", features = ["tls-rustls"] } +bytes = { version = "1.10.1", features = ["serde"] } diff --git a/webrtc/webrtc-rs-server/src/main.rs b/webrtc/webrtc-rs-server/src/main.rs new file mode 100644 index 0000000..4c49ae1 --- /dev/null +++ b/webrtc/webrtc-rs-server/src/main.rs @@ -0,0 +1,332 @@ +//! Example websocket server. +//! +//! Run the server with +//! ```not_rust +//! cargo run -p example-websockets --bin example-websockets +//! ``` +//! +//! Run a browser client with +//! ```not_rust +//! firefox http://localhost:3000 +//! ``` +//! +//! Alternatively you can run the rust client (showing two +//! concurrent websocket connections being established) with +//! ```not_rust +//! cargo run -p example-websockets --bin example-client +//! ``` +//! Example websocket server. +//! +//! Run the server with +//! ```not_rust +//! cargo run -p example-websockets --bin example-websockets +//! ``` +//! +//! Run a browser client with +//! ```not_rust +//! firefox http://localhost:3000 +//! ``` +//! +//! Alternatively you can run the rust client (showing two +//! concurrent websocket connections being established) with +//! ```not_rust +//! cargo run -p example-websockets --bin example-client +//! ``` + +use axum::{ + Router, + body::Bytes, + extract::ws::{Message, Utf8Bytes, WebSocket, WebSocketUpgrade}, + response::IntoResponse, + routing::any, +}; +use axum_extra::TypedHeader; +use rustls::ServerConfig as RustlsServerConfig; +use rustls::crypto::CryptoProvider; +use rustls::pki_types::pem::PemObject; +use rustls::pki_types::{CertificateDer, PrivateKeyDer}; +use webrtc::{ + api::{ + APIBuilder, interceptor_registry::register_default_interceptors, media_engine::MediaEngine, + setting_engine::SettingEngine, + }, + data_channel::RTCDataChannel, + ice_transport::{ice_candidate::RTCIceCandidate, ice_server::RTCIceServer}, + peer_connection::{ + RTCPeerConnection, configuration::RTCConfiguration, + peer_connection_state::RTCPeerConnectionState, + sdp::session_description::RTCSessionDescription, + }, +}; + +use std::{ + net::SocketAddr, + path::PathBuf, + sync::{Arc, OnceLock}, +}; +use std::{ops::ControlFlow, path::Path}; +use tower_http::{ + services::ServeDir, + trace::{DefaultMakeSpan, TraceLayer}, +}; + +use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt}; + +//allows to extract the IP of connecting user +use axum::extract::connect_info::ConnectInfo; +use axum::extract::ws::CloseFrame; +use axum_extra::headers; + +//allows to split the websocket stream into separate TX and RX branches +use futures_util::{sink::SinkExt, stream::StreamExt}; + +static PEER_CONNECTION: OnceLock> = OnceLock::new(); + +#[tokio::main] +async fn main() { + tracing_subscriber::registry() + .with( + tracing_subscriber::EnvFilter::try_from_default_env().unwrap_or_else(|_| { + format!("{}=debug,tower_http=debug", env!("CARGO_CRATE_NAME")).into() + }), + ) + .with(tracing_subscriber::fmt::layer()) + .init(); + + CryptoProvider::install_default(rustls::crypto::ring::default_provider()).unwrap(); + + let assets_dir = PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("assets"); + + // Use fixed relative paths from this crate to the repo certs + let cert_path = Path::new("../../certs/localhost.pem"); + let key_path = Path::new("../../certs/localhost-key.pem"); + + // build our application with some routes + let app = Router::new() + .fallback_service(ServeDir::new(assets_dir).append_index_html_on_directories(true)) + .route("/", any(ws_handler)) + // logging so we can see what's going on + .layer( + TraceLayer::new_for_http() + .make_span_with(DefaultMakeSpan::default().include_headers(true)), + ); + // run it with hyper + let bind_addr = SocketAddr::from(([127, 0, 0, 1], 8002)); + tracing::debug!("listening on {}", bind_addr); + // Build a Rustls ServerConfig and force ALPN to http/1.1 so WebSocket upgrade works over TLS + let cert = CertificateDer::from_pem_file(cert_path).expect("load certs"); + let key = PrivateKeyDer::from_pem_file(key_path).expect("load private key"); + let mut tls_config = RustlsServerConfig::builder() + .with_no_client_auth() + .with_single_cert(vec![cert], key) + .expect("invalid cert/key"); + tls_config.alpn_protocols = vec![b"http/1.1".to_vec()]; + let tls_config = + axum_server::tls_rustls::RustlsConfig::from_config(std::sync::Arc::new(tls_config)); + let server = axum_server::bind_rustls(bind_addr, tls_config); + // Provide peer SocketAddr to handlers so ConnectInfo extractor works (prevents 500s on WS upgrade) + server + .serve(app.into_make_service_with_connect_info::()) + .await + .unwrap(); +} + +/// The handler for the HTTP request (this gets called when the HTTP request lands at the start +/// of websocket negotiation). After this completes, the actual switching from HTTP to +/// websocket protocol will occur. +/// This is the last point where we can extract TCP/IP metadata such as IP address of the client +/// as well as things from HTTP headers such as user-agent of the browser etc. +async fn ws_handler( + ws: WebSocketUpgrade, + user_agent: Option>, + ConnectInfo(addr): ConnectInfo, +) -> impl IntoResponse { + let user_agent = if let Some(TypedHeader(user_agent)) = user_agent { + user_agent.to_string() + } else { + String::from("Unknown browser") + }; + println!("`{user_agent}` at {addr} connected."); + // finalize the upgrade process by returning upgrade callback. + // we can customize the callback by sending additional info such as address. + ws.on_upgrade(move |socket| handle_socket(socket, addr)) +} + +/// Actual websocket statemachine (one will be spawned per connection) +async fn handle_socket(mut socket: WebSocket, who: SocketAddr) { + // send a ping (unsupported by some browsers) just to kick things off and get a response + if socket + .send(Message::Ping(Bytes::from_static(&[1, 2, 3]))) + .await + .is_ok() + { + println!("Pinged {who}..."); + } else { + println!("Could not send ping {who}!"); + // no Error here since the only thing we can do is to close the connection. + // If we can not send messages, there is no way to salvage the statemachine anyway. + return; + } + + // Create a MediaEngine object to configure the supported codec + let mut m = MediaEngine::default(); + + // Register default codecs + m.register_default_codecs().unwrap(); + + // Create a SettingEngine to configure network settings + let mut s = SettingEngine::default(); + + // Include loopback candidates so the browser can connect via 127.0.0.1 when running locally + // This mirrors typical local testing behavior and avoids hairpin NAT issues on the same host + s.set_include_loopback_candidate(true); + + // Create a InterceptorRegistry. This is the user configurable RTP/RTCP Pipeline. + // This provides NACKs, RTCP Reports and other features. If you use `webrtc.NewPeerConnection` + // this is enabled by default. If you are manually managing You MUST create a InterceptorRegistry + // for each PeerConnection. + let mut registry = webrtc::interceptor::registry::Registry::new(); + + // Use the default set of Interceptors + registry = register_default_interceptors(registry, &mut m).unwrap(); + + // Create the API object with the MediaEngine + let api = APIBuilder::new() + .with_media_engine(m) + .with_interceptor_registry(registry) + .with_setting_engine(s) + .build(); + + // Prepare the configuration + // When using ICE-Lite, we must not specify ICE servers (STUN/TURN) + // The client will perform all connectivity checks to our host candidates + let config = RTCConfiguration { + ice_servers: vec![RTCIceServer { + urls: vec!["stun:stun.l.google.com:19302".to_owned()], + ..Default::default() + }], + ..Default::default() + }; + + // Create a new RTCPeerConnection + let peer_connection = Arc::new(api.new_peer_connection(config).await.unwrap()); + + // Set the handler for Peer connection state + // This will notify you when the peer has connected/disconnected + peer_connection.on_peer_connection_state_change(Box::new(move |s: RTCPeerConnectionState| { + println!("Peer Connection State has changed: {s}"); + + if s == RTCPeerConnectionState::Failed { + // Wait until PeerConnection has had no network activity for 30 seconds or another failure. It may be reconnected using an ICE Restart. + // Use webrtc.PeerConnectionStateDisconnected if you are interested in detecting faster timeout. + // Note that the PeerConnection may come back from PeerConnectionStateDisconnected. + println!("Peer Connection has gone to failed exiting"); + } + + Box::pin(async {}) + })); + + peer_connection.on_ice_candidate(Box::new(move |candidate: Option| { + Box::pin(async move { + if let Some(c) = candidate { + println!("New ICE candidate: {}", c.to_json().unwrap().candidate); + } else { + println!("ICE gathering complete"); + } + }) + })); + + // Log ICE connection state transitions for deeper diagnostics + peer_connection.on_ice_connection_state_change(Box::new(move |s| { + println!("ICE Connection State changed: {:?}", s); + Box::pin(async {}) + })); + + // Add signaling state change handler + peer_connection.on_signaling_state_change(Box::new(move |s| { + println!("Signaling State changed: {:?}", s); + Box::pin(async {}) + })); + + peer_connection.on_data_channel(Box::new(move |data_channel: Arc| { + let d1 = Arc::clone(&data_channel); + let d2 = Arc::clone(&data_channel); + println!("Data channel '{}'-'{}' received from peer", data_channel.label(), data_channel.id()); + d1.on_open(Box::new(move || { + println!("Data channel '{}'-'{}' open. Random messages will now be sent to any connected DataChannels every 5 seconds", data_channel.label(), data_channel.id()); + Box::pin(async move { + let mut interval = tokio::time::interval(std::time::Duration::from_secs(5)); + loop { + interval.tick().await; + let msg = String::from("Hello from webrtc-rs server!"); + if d2.send_text(msg).await.is_ok() { + println!("Sent message to DataChannel '{}'-'{}'", d2.label(), d2.id()); + } else { + println!("Failed to send message to DataChannel '{}'-'{}'", d2.label(), d2.id()); + break; + } + } + }) + })); + Box::pin(async move {}) + })); + + while let Some(msg) = socket.recv().await { + if let Ok(msg) = msg { + let sdp_bytes = msg.into_text().expect("msg to text"); + println!("Received SDP offer from client {sdp_bytes}"); + if let Some(offer) = serde_json::from_str::(&sdp_bytes).ok() { + println!("Received offer: {offer:?}"); + + let pc = peer_connection.clone(); + + // Apply the offer as the remote description + pc.set_remote_description(offer).await.unwrap(); + + // Create an answer to send to the browser + let answer = pc.create_answer(None).await.unwrap(); + + // Sets the LocalDescription, and starts our UDP listeners + pc.set_local_description(answer).await.unwrap(); + + // Create channel that is blocked until ICE Gathering is complete + let mut gather_complete = pc.gathering_complete_promise().await; + + // Block until ICE Gathering is complete, disabling trickle ICE + // we do this because we only can exchange one signaling message + // in a production application you should exchange ICE Candidates via OnICECandidate + let _ = gather_complete.recv().await; + + // Send the SDP answer back to the client before closing the websocket + if let Some(local) = pc.local_description().await { + let answer_json = serde_json::to_string(&local).expect("marshal SDP answer"); + if socket.send(Message::Text(answer_json.into())).await.is_ok() { + println!("Sent SDP answer to client"); + } else { + println!("Failed to send SDP answer to client"); + } + } else { + println!("No local description available to send as answer"); + } + + println!("Connection established, waiting for messages..."); + + PEER_CONNECTION.set(pc.clone()).unwrap(); + + // Close the WebSocket after sending the answer, like the Go version + // The peer connection will stay alive via the global PEER_CONNECTION + drop(socket); + return; + } else { + println!("Could not parse SDP from client {who}"); + continue; + } + } else { + println!("client {who} abruptly disconnected"); + return; + } + } + + // returning from the handler closes the websocket connection + println!("Websocket context {who} destroyed"); +}