promisify节点tls.connect方法

Question

什么是正确的promisifying方法tls.connect方法，它应该解决与socket实例上成功connect.I发现它有点棘手，因为它似乎没有出路该框用于区分连接时的错误和与TCP服务器通信期间的常规错误（连接成功后）。虽然看起来有点臭也可能是像

const connect = (port, host, options) => { 
    /** 
    * Some workaround to be able 
    * to distinguish between error on connection 
    * and error after connection was established successfully 
    */ 
    let connected = false 

    return new Promise((resolve, reject) => { 
    const socket = tls.connect(port, host, options,() => { 
     connected = true 
     return resolve(socket) 
    }) 

    socket.on('data', (data) => {...}) 
    socket.on('end',() => {...}) 
    socket.on('disconnect',() => {...}) 
    socket.on('error', (err) => { 
     if (!connected) { 
     return reject(err) 
     } 
     console.error(err) 
    }) 
    }) 
} 

Answer 1

返回插座立即添加connected承诺插座代替 - 这样你可以同步附加其他处理程序，并依然能听到并承诺连接：

const connect = (port, host, options) => { 
    let resolve, reject; 
    var connected = new Promise((res, rej) => { resolve = res; reject = rej; }); 
    const socket = tls.connect(port, host, options, resolve); 
    socket.connected = connected; 
    socket.on('error', reject); // it's fine to calll reject/resolve several times 
    return socket; 
};