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cs-channel

v1.0.4

Published

一个跨端调用通信库,让socket、web worker、iframe通信、vscode(`webview`)、electron(`ipcMain`、`ipcRenderer`)等全双工通信调用像调用ajax(`async/await`)一样马上得到处理结果: ```javascript (async () => { const params = { ... }; const data = await channel.call('server-api', params);

Downloads

59

Readme

cs-channel

一个跨端调用通信库,让socket、web worker、iframe通信、vscode(webview)、electron(ipcMainipcRenderer)等全双工通信调用像调用ajax(async/await)一样马上得到处理结果:

  (async () => {
    const params = { ... };
    const data = await channel.call('server-api', params);
  })();

连异常都能处理得非常优雅哦!

try {
  await clientChannel.call<string>('http_post', data);
} catch(e) {
  expect(e.message).toBe('can not find api http_post');
}
const data = { url: 'http://www.baidu.com' };
const error = 'something wrong...';
serverChannel.on('http_get', async param => {
  throw new Error(error);
});
try {
  await clientChannel.call<string>('http_get', data);
} catch(e) {
  expect(e.message).toBe(error);
}

两端(客户端、服务端)同时使用,若服务端环境非nodejs(比如socket下的.NET或java),也可以使用预定的消息协议处理,不影响客户端使用(消息协议后文会说明)。

使用方法

初始化channel实例,定义sender发送与receiver接收两个回调(用vscode的webview开发举例):

客户端

  const vscode = acquireVsCodeApi();
  const clientChannel = new Channel({
    sender: message => void vscode.postMessage(message),
    receiver: callback => {
      window.addEventListener('message', (event: { data: any }) => {
        event && event.data && callback(event.data);
      });
    }
  });

服务端

  const serverChannel = new Channel({
    sender: message => void panel.webview.postMessage(message),
    receiver: callback => {
      panel.webview.onDidReceiveMessage((message: IMessage) => {
        message.api && callback(message);
      }), undefined, context.subscriptions);
    }
  });

此举目的是适配不同场景的消息通信方案。

然后,分为两个场景:

  • 客户端调服务端api
  • 服务端调客户端api
  // 客户端调服务端api

  // 服务端订阅api
  serverChannel.on('server-api', async param => {
    // 处理完成后返回结果
    return await http.get(param.url, param.data);
  });
  // 客户端调用api得到服务端返回的结果
  const result = await clientChannel.call('server-api', {
    url: 'http://...',
    data: { id: 1 }
  });
  // 服务端调客户端api

  // 客户订阅api
  clientChannel.on('client-api', async param => {
    // 客户端收到消息后显示出来,不返回任何数据
    document.querySelector('#msg').innerHTML = param.message;
    document.querySelector('#sendor').innerHTML = param.sendor;
  });
  // 服务端调用api得到客户端返回的结果
  const result = await serverChannel.call('client-api', {
    message: 'hello, client!',
    sender: 'server'
  });

消息协议

  interface IMessage<T=IKeyValueMap> {
    api: string;
    data: T;
    error?: Error;
    msgId: string;
  }
  • 13个单元测试已通过
  • TypeScript静态类型约束 + d.ts声明