vscode源码分析【七】主进程启动消息通信服务

2019-07-02 17:36:35 浏览数 (1)

在mian.ts中的doStartup方法里,创建了一个命名管道服务 (srcvscodeelectron-mainmain.ts)

代码语言:javascript复制
server = await serve(environmentService.mainIPCHandle);
once(lifecycleService.onWillShutdown)(() => server.dispose());

传入的environmentService.mainIPCHandle是命名管道的识别路径, 一个有规则的字符串,规则如下:

代码语言:javascript复制
function getWin32IPCHandle(userDataPath: string, type: string): string {
	const scope = crypto.createHash('md5').update(userDataPath).digest('hex');
	return `\\.\pipe\${scope}-${pkg.version}-${type}-sock`;
}

注意:每次启动程序,取这个字符串的时候,都会获得同样的值(而且这个值是会被缓存起来的); 以后监听消息、发送消息,都根据这个字符串来; 创建服务的代码(serve):

代码语言:javascript复制
export function serve(hook: any): Promise<Server> {
	return new Promise<Server>((c, e) => {
		const server = createServer();
		server.on('error', e);
		server.listen(hook, () => {
			server.removeListener('error', e);
			c(new Server(server));
		});
	});
}

这个方法返回了一个Promise的对象, c和e是Promise的参数,c代表成功时的回调,e代表失败时的回调(有点类似es6的Promise) 匿名函数内createServer就是nodejs里的原生接口, Server类绑定了连接和断开的事件,暂时不细说; 回头看看main.ts startup方法里有这么一句:

代码语言:javascript复制
instantiationService.createInstance(CodeApplication, mainIpcServer, instanceEnvironment).startup();

这句显然是创建了CodeApplication的实例,然后执行了实例的startup方法 注意:创建这个实例的时候,把我们前面创建的mainIpcServer传递进去了; CodeApplication(srcvscodeelectron-mainapp.ts)的startup方法,还启动了Electron的IPCServer

代码语言:javascript复制
const electronIpcServer = new ElectronIPCServer();

vscode把electron默认的通信机制也接入到了自己的事件体系内,有消息过来,会触发事件; 具体先不细说,后面再讲. 接着就跳转到同类型里的openFirstWindow方法(是不是很熟悉,我们在第一篇文章中讲到过这里) 在这里,给这两个服务(mainIpcServer和electronIpcServer ),创建了一堆信道:

代码语言:javascript复制
const launchService = accessor.get(ILaunchService);
		const launchChannel = new LaunchChannel(launchService);
		this.mainIpcServer.registerChannel('launch', launchChannel);

		const updateService = accessor.get(IUpdateService);
		const updateChannel = new UpdateChannel(updateService);
		electronIpcServer.registerChannel('update', updateChannel);

		const issueService = accessor.get(IIssueService);
		const issueChannel = new IssueChannel(issueService);
		electronIpcServer.registerChannel('issue', issueChannel);

		const workspacesService = accessor.get(IWorkspacesMainService);
		const workspacesChannel = new WorkspacesChannel(workspacesService);
		electronIpcServer.registerChannel('workspaces', workspacesChannel);

		const windowsService = accessor.get(IWindowsService);
		const windowsChannel = new WindowsChannel(windowsService);
		electronIpcServer.registerChannel('windows', windowsChannel);
		sharedProcessClient.then(client => client.registerChannel('windows', windowsChannel));

		const menubarService = accessor.get(IMenubarService);
		const menubarChannel = new MenubarChannel(menubarService);
		electronIpcServer.registerChannel('menubar', menubarChannel);

		const urlService = accessor.get(IURLService);
		const urlChannel = new URLServiceChannel(urlService);
		electronIpcServer.registerChannel('url', urlChannel);

		const storageMainService = accessor.get(IStorageMainService);
		const storageChannel = this._register(new GlobalStorageDatabaseChannel(this.logService, storageMainService as StorageMainService));
		electronIpcServer.registerChannel('storage', storageChannel);


		const logLevelChannel = new LogLevelSetterChannel(accessor.get(ILogService));
		electronIpcServer.registerChannel('loglevel', logLevelChannel);

有存储、日志、菜单栏、工作台、升级.....等等 主要的通信还是用electronIpcServer 来干的,mainIpcServer只有一个launch信道; 下面我们看看消息是怎么传递的 我们随便打开一个信道的类型(srcvsplatformwindowsnodewindowsIpc.ts) 它有两个主要的函数,listen和call,

代码语言:javascript复制
	listen(_: unknown, event: string): Event<any> {
		switch (event) {
			case 'onWindowOpen': return this.onWindowOpen;
			case 'onWindowFocus': return this.onWindowFocus;
			case 'onWindowBlur': return this.onWindowBlur;
			case 'onWindowMaximize': return this.onWindowMaximize;
			case 'onWindowUnmaximize': return this.onWindowUnmaximize;
			case 'onRecentlyOpenedChange': return this.onRecentlyOpenedChange;
		}
		throw new Error(`Event not found: ${event}`);
	}
代码语言:javascript复制
	call(_: unknown, command: string, arg?: any): Promise<any> {
		switch (command) {
			case 'pickFileFolderAndOpen': return this.service.pickFileFolderAndOpen(arg);
			case 'pickFileAndOpen': return this.service.pickFileAndOpen(arg);
			case 'pickFolderAndOpen': return this.service.pickFolderAndOpen(arg);
			case 'pickWorkspaceAndOpen': return this.service.pickWorkspaceAndOpen(arg);
			case 'showMessageBox': return this.service.showMessageBox(arg[0], arg[1]);
			case 'showSaveDialog': return this.service.showSaveDialog(arg[0], arg[1]);
			case 'showOpenDialog': return this.service.showOpenDialog(arg[0], arg[1]);
//......

消息来了,进入listen函数,发送消息,进入call函数; 注意,消息来了,触发的也不是他自己的方法,我们看看它的构造函数:

代码语言:javascript复制
	constructor(private service: IWindowsService) {
		this.onWindowOpen = Event.buffer(service.onWindowOpen, true);
		this.onWindowFocus = Event.buffer(service.onWindowFocus, true);
		this.onWindowBlur = Event.buffer(service.onWindowBlur, true);
		this.onWindowMaximize = Event.buffer(service.onWindowMaximize, true);
		this.onWindowUnmaximize = Event.buffer(service.onWindowUnmaximize, true);
		this.onRecentlyOpenedChange = Event.buffer(service.onRecentlyOpenedChange, true);
	}

看到没,触发的其实是一个事件,事件是关联到service实例的; 这个实例是这样创建的:

代码语言:javascript复制
const windowsService = accessor.get(IWindowsService);

具体的代码在:srcvsplatformwindowselectron-browserwindowsService.ts

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