Trigger ice restart in case of the network changed

Author: mustafaboleken

src/main/js/webrtc_adaptor.js

@@ -162,6 +162,12 @@ export class WebRTCAdaptor {
 		 */
 		this.debug = false;
 
+		/**
+		 * This is the flag to indicate if the stream is published or not after the connection fails
+		 * @type {boolean}
+		 */
+		this.iceRestart = false;
+
 		/**
 		 * This is the Stream Id for the publisher. One @WebRCTCAdaptor supports only one publishing
 		 * session for now (23.02.2022).
@@ -1092,8 +1098,18 @@ export class WebRTCAdaptor {
 				this.onTrack(event, closedStreamId);
 			}
 
-			this.remotePeerConnection[streamId].onnegotiationneeded = event => {
+			this.remotePeerConnection[streamId].onnegotiationneeded = async event => {
 				Logger.debug("onnegotiationneeded");
+				//If ice restart is not true, then server will handle negotiation
+				if (!this.iceRestart) {
+					return;
+				}
+				try {
+					await this.remotePeerConnection[streamId].setLocalDescription(await this.remotePeerConnection[streamId].createOffer({iceRestart: this.iceRestart}));
+					this.webSocketAdaptor.send({desc: this.remotePeerConnection[streamId].localDescription});
+				} catch (error) {
+					Logger.error('Error during negotiation', error);
+				}
 			}
 
 			if (this.dataChannelEnabled) {
@@ -1136,7 +1152,12 @@ export class WebRTCAdaptor {
 
 			this.remotePeerConnection[streamId].oniceconnectionstatechange = event => {
 				var obj = { state: this.remotePeerConnection[streamId].iceConnectionState, streamId: streamId };
-				if (obj.state == "failed" || obj.state == "disconnected" || obj.state == "closed") {
+				if (obj.state === "stable") {
+					this.iceRestart = false;
+				} else if (obj.state === "failed") {
+					this.iceRestart = true;
+					this.remotePeerConnection[streamId].restartIce();
+				} else if (obj.state === "disconnected" || obj.state === "closed") {
 					this.reconnectIfRequired(3000);
 				}
 				this.notifyEventListeners("ice_connection_state_changed", obj);

src/test/js/webrtc_adaptor.test.js

@@ -1923,6 +1923,28 @@ describe("WebRTCAdaptor", function() {
 
 	});
 
+	describe("oniceconnectionstatechange", function () {
+		let adaptor;
+		let mockPeerConnection;
+
+		beforeEach(function () {
+			adaptor = new WebRTCAdaptor({
+				websocketURL: "ws://example.com",
+				initializeComponents: false,
+			});
+			mockPeerConnection = { iceConnectionState: "", restartIce: sinon.fake(), oniceconnectionstatechange: sinon.fake()};
+			adaptor.remotePeerConnection["stream1"] = mockPeerConnection;
+		});
+
+		it("should set iceRestart to false when state is stable", function () {
+			mockPeerConnection.iceConnectionState = "stable";
+
+			adaptor.remotePeerConnection["stream1"].oniceconnectionstatechange();
+
+			expect(adaptor.iceRestart).to.be.false;
+		});
+	});
+
 
 
 });