Aurelia，Electron：检测到可能的 EventEmitter 内存泄漏

Question

我正在使用 electron 和 aurelia 构建一个系统资源监视器作为一个项目。

Main.js

  var ramInfo = {};
  var result = await si.mem()
  ramInfo.total = parseInt(result.total / 1024 / 1024);
  ramInfo.used = parseInt(result.used / 1024 / 1024);
  ramInfo.percentUsed = parseInt((ramInfo.used / ramInfo.total) * 100);
  ramInfo.percentAvailable = parseInt((ramInfo.percentUsed - 100) * -1);
  event.sender.send('ram-reply', ramInfo);
})

Overview.js:

  async attached () {
    await this.getRamInfo();
    this.startDataRefresh();

  }

  async getRamInfo () {
    window.ipc.send('ram');
     await window.ipc.on('ram-reply', (event, result) => {
        this.system.ram = result;
        //This line gets logged an additional time each time the setInterval function runs
        console.log(this.system.ram);
        this.ramData.series = [this.system.ram.percentAvailable, this.system.ram.percentUsed];
        new Chartist.Pie('.ram-chart', this.ramData , this.options);
      });
      console.log("Break");
    }

  startDataRefresh() {
    let scope = this;
    setInterval(function() {
      scope.getRamInfo();
    }, 3000);
  }

我在电子控制台中收到以下错误：

MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 ram-reply listeners added to [EventEmitter]. Use emitter.setMaxListeners() to increase limit

我只认为 getRamInfo() 函数会运行每三秒一次，但是，函数的 console.log 部分会在每次函数运行秒。我很确定这就是问题所在，我只是不确定为什么每个间隔运行宁多次。

编辑：我已经找到了将 setInterval 函数移动到 main.js:

的部分解决方案

ipcMain.on('ram', async (event) => {
  setInterval(async function() {
    var ramInfo = {};
    var result = await si.mem()
    ramInfo.total = parseInt(result.total / 1024 / 1024);
    ramInfo.used = parseInt(result.used / 1024 / 1024);
    ramInfo.percentUsed = parseInt((ramInfo.used / ramInfo.total) * 100);
    ramInfo.percentAvailable = parseInt((ramInfo.percentUsed - 100) * -1);
    event.sender.send('ram-reply', ramInfo)
  }, 3000);
})

似乎每次原始 setInterval 调用 ipcMain 都会创建一个新的侦听器，并且每次每个侦听器都返回结果。我希望它依赖于打开的视图，因此最好通过视图控制它。

Answer 1

试试这个：

async getRamInfo () {
    window.ipc.send('ram');
    return new Promise(resolve => window.ipc.once('ram-reply', (event, result) => resolve(result));
}

async refresh() {
    const ramInfo = await this.getRamInfo();
    this.ramData.series = [this.system.ram.percentAvailable, this.system.ram.percentUsed];
    new Chartist.Pie('.ram-chart', this.ramData , this.options);
    // ...
}

startDataRefresh() {
    if(!this.interval) {
        this.interval = setInterval(() => this.refresh(), 3000);
    }
}

stopDataRefresh() {
    if(this.interval) {
        clearInterval(this.interval);
        delete this.interval;
    }
}

主要部分 - window.ipc.once('ram-reply' - 使用 once 进行 one-time 事件订阅

Aurelia，Electron：检测到可能的 EventEmitter 内存泄漏

Aurelia, Electron: Possible EventEmitter memory leak detected

aurelia

electron