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[package] | ||
name = "webrtc-node-app" | ||
version = "0.1.0" | ||
edition = "2021" | ||
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html | ||
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[dependencies] | ||
socketioxide = { path = "../../socketioxide" } | ||
axum.workspace = true | ||
tokio = { workspace = true, features = ["rt-multi-thread", "macros"] } | ||
tower-http = { version = "0.5.0", features = ["cors", "fs"] } | ||
tower.workspace = true | ||
tracing-subscriber.workspace = true | ||
tracing.workspace = true | ||
serde.workspace = true | ||
serde_json.workspace = true |
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# WebRTC Node App | ||
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Simple implementation of a webrtc application with socket.io for the signaling part. | ||
The implementation is taken from this article: | ||
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https://acidtango.com/thelemoncrunch/how-to-implement-a-video-conference-with-webrtc-and-node/ | ||
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Here is the repository of the original author: | ||
https://github.com/borjanebbal/webrtc-node-app |
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// DOM elements. | ||
const roomSelectionContainer = document.getElementById( | ||
"room-selection-container", | ||
); | ||
const roomInput = document.getElementById("room-input"); | ||
const connectButton = document.getElementById("connect-button"); | ||
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const videoChatContainer = document.getElementById("video-chat-container"); | ||
const localVideoComponent = document.getElementById("local-video"); | ||
const remoteVideoComponent = document.getElementById("remote-video"); | ||
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// Variables. | ||
const socket = io(); | ||
const mediaConstraints = { | ||
audio: true, | ||
video: { width: 1280, height: 720 }, | ||
}; | ||
let localStream; | ||
let remoteStream; | ||
let isRoomCreator; | ||
let rtcPeerConnection; // Connection between the local device and the remote peer. | ||
let roomId; | ||
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// Free public STUN servers provided by Google. | ||
const iceServers = { | ||
iceServers: [ | ||
{ urls: "stun:stun.l.google.com:19302" }, | ||
{ urls: "stun:stun1.l.google.com:19302" }, | ||
{ urls: "stun:stun2.l.google.com:19302" }, | ||
{ urls: "stun:stun3.l.google.com:19302" }, | ||
{ urls: "stun:stun4.l.google.com:19302" }, | ||
], | ||
}; | ||
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// BUTTON LISTENER ============================================================ | ||
connectButton.addEventListener("click", () => { | ||
joinRoom(roomInput.value); | ||
}); | ||
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// SOCKET EVENT CALLBACKS ===================================================== | ||
socket.on("room_created", async () => { | ||
console.log("Socket event callback: room_created"); | ||
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await setLocalStream(mediaConstraints); | ||
isRoomCreator = true; | ||
}); | ||
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socket.on("room_joined", async () => { | ||
console.log("Socket event callback: room_joined"); | ||
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await setLocalStream(mediaConstraints); | ||
socket.emit("start_call", roomId); | ||
}); | ||
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socket.on("full_room", () => { | ||
console.log("Socket event callback: full_room"); | ||
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alert("The room is full, please try another one"); | ||
}); | ||
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socket.on("start_call", async () => { | ||
console.log("Socket event callback: start_call"); | ||
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if (isRoomCreator) { | ||
rtcPeerConnection = new RTCPeerConnection(iceServers); | ||
addLocalTracks(rtcPeerConnection); | ||
rtcPeerConnection.ontrack = setRemoteStream; | ||
rtcPeerConnection.onicecandidate = sendIceCandidate; | ||
await createOffer(rtcPeerConnection); | ||
} | ||
}); | ||
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socket.on("webrtc_offer", async (event) => { | ||
console.log("Socket event callback: webrtc_offer"); | ||
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if (!isRoomCreator) { | ||
rtcPeerConnection = new RTCPeerConnection(iceServers); | ||
addLocalTracks(rtcPeerConnection); | ||
rtcPeerConnection.ontrack = setRemoteStream; | ||
rtcPeerConnection.onicecandidate = sendIceCandidate; | ||
rtcPeerConnection.setRemoteDescription(new RTCSessionDescription(event)); | ||
await createAnswer(rtcPeerConnection); | ||
} | ||
}); | ||
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socket.on("webrtc_answer", (event) => { | ||
console.log("Socket event callback: webrtc_answer"); | ||
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rtcPeerConnection.setRemoteDescription(new RTCSessionDescription(event)); | ||
}); | ||
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socket.on("webrtc_ice_candidate", (event) => { | ||
console.log("Socket event callback: webrtc_ice_candidate"); | ||
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// ICE candidate configuration. | ||
const candidate = new RTCIceCandidate({ | ||
sdpMLineIndex: event.label, | ||
candidate: event.candidate, | ||
}); | ||
rtcPeerConnection.addIceCandidate(candidate); | ||
}); | ||
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// FUNCTIONS ================================================================== | ||
function joinRoom(room) { | ||
if (room === "") { | ||
alert("Please type a room ID"); | ||
} else { | ||
roomId = room; | ||
socket.emit("join", room); | ||
showVideoConference(); | ||
} | ||
} | ||
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function showVideoConference() { | ||
roomSelectionContainer.style.display = "none"; | ||
videoChatContainer.style.display = "block"; | ||
} | ||
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async function setLocalStream(mediaConstraints) { | ||
try { | ||
localStream = await navigator.mediaDevices.getUserMedia(mediaConstraints); | ||
localVideoComponent.srcObject = localStream; | ||
} catch (error) { | ||
console.error("Could not get user media", error); | ||
} | ||
} | ||
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function addLocalTracks(rtcPeerConnection) { | ||
localStream.getTracks().forEach((track) => { | ||
rtcPeerConnection.addTrack(track, localStream); | ||
}); | ||
} | ||
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async function createOffer(rtcPeerConnection) { | ||
try { | ||
const sessionDescription = await rtcPeerConnection.createOffer(); | ||
rtcPeerConnection.setLocalDescription(sessionDescription); | ||
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socket.emit("webrtc_offer", { | ||
type: "webrtc_offer", | ||
sdp: sessionDescription, | ||
roomId, | ||
}); | ||
} catch (error) { | ||
console.error(error); | ||
} | ||
} | ||
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async function createAnswer(rtcPeerConnection) { | ||
try { | ||
const sessionDescription = await rtcPeerConnection.createAnswer(); | ||
rtcPeerConnection.setLocalDescription(sessionDescription); | ||
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socket.emit("webrtc_answer", { | ||
type: "webrtc_answer", | ||
sdp: sessionDescription, | ||
roomId, | ||
}); | ||
} catch (error) { | ||
console.error(error); | ||
} | ||
} | ||
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function setRemoteStream(event) { | ||
remoteVideoComponent.srcObject = event.streams[0]; | ||
remoteStream = event.stream; | ||
} | ||
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function sendIceCandidate(event) { | ||
if (event.candidate) { | ||
socket.emit("webrtc_ice_candidate", { | ||
roomId, | ||
label: event.candidate.sdpMLineIndex, | ||
candidate: event.candidate.candidate, | ||
}); | ||
} | ||
} |
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<!doctype html> | ||
<html lang="en"> | ||
<head> | ||
<meta charset="UTF-8" /> | ||
<meta name="viewport" content="width=device-width, initial-scale=1.0" /> | ||
<title>WebRTC</title> | ||
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<style type="text/css"> | ||
body { | ||
margin: 0; | ||
font-size: 20px; | ||
} | ||
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.centered { | ||
position: absolute; | ||
top: 40%; | ||
left: 50%; | ||
transform: translate(-50%, -50%); | ||
} | ||
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.video-position { | ||
position: absolute; | ||
top: 35%; | ||
left: 50%; | ||
transform: translate(-50%, -50%); | ||
} | ||
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#video-chat-container { | ||
width: 100%; | ||
background-color: black; | ||
} | ||
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#local-video { | ||
position: absolute; | ||
height: 30%; | ||
width: 30%; | ||
bottom: 0px; | ||
left: 0px; | ||
} | ||
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#remote-video { | ||
height: 100%; | ||
width: 100%; | ||
} | ||
</style> | ||
</head> | ||
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<body> | ||
<div id="room-selection-container" class="centered"> | ||
<h1>WebRTC video conference</h1> | ||
<label>Enter the number of the room you want to connect</label> | ||
<input id="room-input" type="text" /> | ||
<button id="connect-button">CONNECT</button> | ||
</div> | ||
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<div | ||
id="video-chat-container" | ||
class="video-position" | ||
style="display: none" | ||
> | ||
<video id="local-video" autoplay="autoplay" muted="muted"></video> | ||
<video id="remote-video" autoplay="autoplay"></video> | ||
</div> | ||
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<script | ||
src="https://cdn.socket.io/4.6.0/socket.io.min.js" | ||
integrity="sha384-c79GN5VsunZvi+Q/WObgk2in0CbZsHnjEqvFxC5DxHn9lTfNce2WW6h2pH6u/kF+" | ||
crossorigin="anonymous" | ||
></script> | ||
<script type="text/javascript" src="client.js"></script> | ||
</body> | ||
</html> |
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use socketioxide::{ | ||
extract::{Data, SocketRef}, | ||
SocketIo, | ||
}; | ||
use tower::ServiceBuilder; | ||
use tower_http::{cors::CorsLayer, services::ServeDir}; | ||
use tracing::info; | ||
use tracing_subscriber::FmtSubscriber; | ||
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#[derive(serde::Deserialize, serde::Serialize)] | ||
#[serde(rename_all = "camelCase")] | ||
struct Event { | ||
room_id: String, | ||
sdp: serde_json::Value, | ||
} | ||
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#[derive(serde::Deserialize, serde::Serialize)] | ||
#[serde(rename_all = "camelCase")] | ||
struct IceCandidate { | ||
room_id: String, | ||
#[serde(flatten)] | ||
data: serde_json::Value, | ||
} | ||
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#[tokio::main] | ||
async fn main() -> Result<(), Box<dyn std::error::Error>> { | ||
let subscriber = FmtSubscriber::new(); | ||
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tracing::subscriber::set_global_default(subscriber)?; | ||
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info!("Starting server"); | ||
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let (layer, io) = SocketIo::new_layer(); | ||
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io.ns("/", |s: SocketRef| { | ||
s.on("join", |s: SocketRef, Data(room_id): Data<String>| { | ||
let socket_cnt = s.within(room_id.clone()).sockets().unwrap().len(); | ||
if socket_cnt == 0 { | ||
tracing::info!("creating room {room_id} and emitting room_created socket event"); | ||
s.join(room_id.clone()).unwrap(); | ||
s.emit("room_created", room_id).unwrap(); | ||
} else if socket_cnt == 1 { | ||
tracing::info!("joining room {room_id} and emitting room_joined socket event"); | ||
s.join(room_id.clone()).unwrap(); | ||
s.emit("room_joined", room_id).unwrap(); | ||
} else { | ||
tracing::info!("Can't join room {room_id}, emitting full_room socket event"); | ||
s.emit("full_room", room_id); | ||
} | ||
}); | ||
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s.on("start_call", |s: SocketRef, Data(room_id): Data<String>| { | ||
tracing::info!("broadcasting start_call event to peers in room {room_id}"); | ||
s.to(room_id.clone()).emit("start_call", room_id); | ||
}); | ||
s.on("webrtc_offer", |s: SocketRef, Data(event): Data<Event>| { | ||
tracing::info!( | ||
"broadcasting webrtc_offer event to peers in room {}", | ||
event.room_id | ||
); | ||
s.to(event.room_id).emit("webrtc_offer", event.sdp); | ||
}); | ||
s.on("webrtc_answer", |s: SocketRef, Data(event): Data<Event>| { | ||
tracing::info!( | ||
"broadcasting webrtc_answer event to peers in room {}", | ||
event.room_id | ||
); | ||
s.to(event.room_id).emit("webrtc_answer", event.sdp); | ||
}); | ||
s.on( | ||
"webrtc_ice_candidate", | ||
|s: SocketRef, Data(event): Data<IceCandidate>| { | ||
tracing::info!( | ||
"broadcasting ice_candidate event to peers in room {}", | ||
event.room_id | ||
); | ||
s.to(event.room_id.clone()) | ||
.emit("webrtc_ice_candidate", event); | ||
}, | ||
); | ||
}); | ||
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let app = axum::Router::new() | ||
.nest_service("/", ServeDir::new("public")) | ||
.layer( | ||
ServiceBuilder::new() | ||
.layer(CorsLayer::permissive()) // Enable CORS policy | ||
.layer(layer), | ||
); | ||
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let listener = tokio::net::TcpListener::bind("0.0.0.0:3000").await.unwrap(); | ||
axum::serve(listener, app).await.unwrap(); | ||
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Ok(()) | ||
} |