feat: use long living socket connection for sync

lib/definitions/livesync.d.ts

@@ -398,6 +398,11 @@ interface IAndroidNativeScriptDeviceLiveSyncService extends INativeScriptDeviceL
 }
 
 interface IAndroidLivesyncTool {
+	/**
+	 * The protocol version the current app(adnroid runtime) is using.
+	 */
+	protocolVersion: string;
+
 	/**
 	 * Creates new socket connection.
 	 * @param configuration - The configuration to the socket connection.
@@ -457,6 +462,11 @@ interface IAndroidLivesyncTool {
 	 * @param error - Optional error for rejecting pending sync operations
 	 */
 	end(error?: Error): void;
+
+	/**
+	 * Returns true if a connection has been already established
+	 */
+	hasConnection(): boolean;
 }
 
 interface IAndroidLivesyncToolConfiguration {

lib/services/livesync/android-device-livesync-sockets-service.ts

@@ -6,10 +6,12 @@ import { LiveSyncPaths } from "../../common/constants";
 import { AndroidLivesyncTool } from "./android-livesync-tool";
 import * as path from "path";
 import * as temp from "temp";
+import * as semver from "semver";
 
 export class AndroidDeviceSocketsLiveSyncService extends DeviceLiveSyncServiceBase implements IAndroidNativeScriptDeviceLiveSyncService, INativeScriptDeviceLiveSyncService {
 	private livesyncTool: IAndroidLivesyncTool;
 	private static STATUS_UPDATE_INTERVAL = 10000;
+	private static MINIMAL_VERSION_LONG_LIVING_CONNECTION = "0.2.0";
 
 	constructor(
 		private data: IProjectData,
@@ -20,19 +22,18 @@ export class AndroidDeviceSocketsLiveSyncService extends DeviceLiveSyncServiceBa
 		protected device: Mobile.IAndroidDevice,
 		private $options: ICommonOptions,
 		private $processService: IProcessService,
-		private $fs: IFileSystem) {
+		private $fs: IFileSystem,
+		private $devicePlatformsConstants: Mobile.IDevicePlatformsConstants) {
 		super($platformsData, device);
 		this.livesyncTool = this.$injector.resolve(AndroidLivesyncTool);
 	}
 
 	public async beforeLiveSyncAction(deviceAppData: Mobile.IDeviceAppData): Promise<void> {
-		const platformData = this.$platformsData.getPlatformData(deviceAppData.platform, this.data);
-		const projectFilesPath = path.join(platformData.appDestinationDirectoryPath, APP_FOLDER_NAME);
 		const pathToLiveSyncFile = temp.path({ prefix: "livesync" });
 		this.$fs.writeFile(pathToLiveSyncFile, "");
 		await this.device.fileSystem.putFile(pathToLiveSyncFile, this.getPathToLiveSyncFileOnDevice(deviceAppData.appIdentifier), deviceAppData.appIdentifier);
 		await this.device.applicationManager.startApplication({ appId: deviceAppData.appIdentifier, projectName: this.data.projectName, justLaunch: true });
-		await this.connectLivesyncTool(projectFilesPath, this.data.projectId);
+		await this.connectLivesyncTool(this.data.projectId);
 	}
 
 	private getPathToLiveSyncFileOnDevice(appIdentifier: string): string {
@@ -42,8 +43,11 @@ export class AndroidDeviceSocketsLiveSyncService extends DeviceLiveSyncServiceBa
 	public async finalizeSync(liveSyncInfo: ILiveSyncResultInfo, projectData: IProjectData): Promise<IAndroidLivesyncSyncOperationResult> {
 		try {
 			const result = await this.doSync(liveSyncInfo, projectData);
+			if (!semver.gte(this.livesyncTool.protocolVersion, AndroidDeviceSocketsLiveSyncService.MINIMAL_VERSION_LONG_LIVING_CONNECTION)) {
+				this.livesyncTool.end();
+			}
 			return result;
-		} finally {
+		} catch (e) {
 			this.livesyncTool.end();
 		}
 	}
@@ -85,6 +89,13 @@ export class AndroidDeviceSocketsLiveSyncService extends DeviceLiveSyncServiceBa
 		const canExecuteFastSync = !liveSyncInfo.isFullSync && this.canExecuteFastSyncForPaths(liveSyncInfo.modifiedFilesData, projectData, this.device.deviceInfo.platform);
 		if (!canExecuteFastSync || !liveSyncInfo.didRefresh) {
 			await this.device.applicationManager.restartApplication({ appId: liveSyncInfo.deviceAppData.appIdentifier, projectName: projectData.projectName });
+			if (this.livesyncTool.protocolVersion && semver.gte(this.livesyncTool.protocolVersion, AndroidDeviceSocketsLiveSyncService.MINIMAL_VERSION_LONG_LIVING_CONNECTION)) {
+				try {
+					await this.connectLivesyncTool(liveSyncInfo.deviceAppData.appIdentifier);
+				} catch (e) {
+					this.$logger.trace("Failed to connect after app restart.");
+				}
+			}
 		}
 	}
 
@@ -143,12 +154,16 @@ export class AndroidDeviceSocketsLiveSyncService extends DeviceLiveSyncServiceBa
 		return transferredLocalToDevicePaths;
 	}
 
-	private async connectLivesyncTool(projectFilesPath: string, appIdentifier: string) {
-		await this.livesyncTool.connect({
-			appIdentifier,
-			deviceIdentifier: this.device.deviceInfo.identifier,
-			appPlatformsPath: projectFilesPath
-		});
+	private async connectLivesyncTool(appIdentifier: string) {
+		const platformData = this.$platformsData.getPlatformData(this.$devicePlatformsConstants.Android, this.data);
+		const projectFilesPath = path.join(platformData.appDestinationDirectoryPath, APP_FOLDER_NAME);
+		if (!this.livesyncTool.hasConnection()) {
+			await this.livesyncTool.connect({
+				appIdentifier,
+				deviceIdentifier: this.device.deviceInfo.identifier,
+				appPlatformsPath: projectFilesPath
+			});
+		}
 	}
 
 	public getDeviceHashService(appIdentifier: string): Mobile.IAndroidDeviceHashService {

lib/services/livesync/android-livesync-tool.ts

@@ -20,6 +20,7 @@ const TRY_CONNECT_TIMEOUT = 30000;
 const DEFAULT_LOCAL_HOST_ADDRESS = "127.0.0.1";
 
 export class AndroidLivesyncTool implements IAndroidLivesyncTool {
+	public protocolVersion: string;
 	private operationPromises: IDictionary<any>;
 	private socketError: string | Error;
 	private socketConnection: INetSocket;
@@ -179,6 +180,10 @@ export class AndroidLivesyncTool implements IAndroidLivesyncTool {
 		}
 	}
 
+	public hasConnection(): boolean {
+		return !!this.socketConnection;
+	}
+
 	private sendFileHeader(filePath: string): Promise<void> {
 		return new Promise((resolve, reject) => {
 			let error;
@@ -292,6 +297,7 @@ export class AndroidLivesyncTool implements IAndroidLivesyncTool {
 		const protocolVersion = versionBuffer.toString();
 		const appIdentifier = appIdentifierBuffer.toString();
 		this.$logger.trace(`Handle socket connection for app identifier: ${appIdentifier} with protocol version: ${protocolVersion}.`);
+		this.protocolVersion = protocolVersion;
 
 		this.socketConnection.on("data", (connectionData: NodeBuffer) => this.handleData(socket.uid, connectionData));
 		this.socketConnection.on("close", (hasError: boolean) => this.handleSocketClose(socket.uid, hasError));