Node中的SFTP模块下载和删除文件 [英] SFTP modules in Node to download and delete files

问题描述

我的任务(或者更好，应该)很简单:从 Node 应用程序中获取 SFTP 目录的内容，然后下载其中的所有文件，最后远程删除它们.

my task is (or better, should be) simple: to fetch the content of a directory in SFTP from a Node application, then download all the files in there and finally delete them remotely.

现在，我检查了不同的模块.在我看来，非常干净的是 ssh2-sftp-client.我可以这样使用它:

Now, I've checked different modules. Very clean, in my opinion, is ssh2-sftp-client. I can use it like this:

let Client = require('ssh2-sftp-client');
let sftp = new Client();

sftp.connect({
    host: myhost,
    port: '22',
    username: myusername,
    password: mypassword
}).then(() => {
    return sftp.list('/path/to/my/files');
}).then((data) => {

    for(var i = 0 ; i < data.length; i++) {
        sftp.get('/path/to/my/files/'+data[i].name); 
        }   
}).catch((err) => {
    console.log(err, 'catch error');
});

我可以列出所有文件并在控制台中查看生成的 json，但是 .get 命令似乎什么也没做，我不知道出了什么问题.从文档(https://www.npmjs.com/package/ssh2-sftp-客户端)你可以像我一样简单地获取文件.但是:

I can list all files and see the resulting jSon in console, but the .get command seems to do nothing and I have no idea what is wrong. From the documentation (https://www.npmjs.com/package/ssh2-sftp-client) you can get files simply like I'm doing. But:

1) 它似乎不起作用2)我如何调试正在发生的事情?3)如果我没有机会选择本地目录，这些文件很可能会下载到node启动js的地方，对吗?

1) it doesn't seem to work 2) how can I debug what's going on? 3) if I have no chance to choose the local directory, will these files most probably be downloaded where the js is launched by node, right?

那么，如果使用此模块(或其他模块，如果有)成功下载文件，我如何才能实际下载并可能远程删除文件?

So, how could I get the files actually downloaded and possibly deleted remotely if they were successfully downloaded with this module (or others if any)?

谢谢，法比奥

推荐答案

sftp.get() 返回一个返回流的 Promise，所以如果你想将流保存到磁盘，你将需要管道它.例如:

sftp.get() returns a Promise that returns a stream, so if you want to save the stream to disk, you will need to pipe it. For example:

var fs = require('fs');

// ...

for(var i = 0; i < data.length; i++) {
  const remoteFilename = '/path/to/remote/files/' + data[i].name;
  const localFilename = '/path/to/local/files/' + data[i].name;
  sftp.get(remoteFilename).then((stream) => {
    stream.pipe(fs.createWriteStream(localFilename));
  });
}

此外，ssh2-sftp-client 似乎没有使用 ssh2 模块的最新版本分支(在撰写本文时为 v0.5.x)，如果您遇到问题，请记住这一点.

Also, it appears that ssh2-sftp-client is not using the latest version branch of the ssh2 module (v0.5.x as of this writing), so keep that in mind if you run into issues.

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