Node.js 如何将tar目录存储在节点js中的s3上？

使用AWS SDK，我能够存储文件（压缩或未压缩）和压缩目录（使用tar），但不能存储未压缩目录

设置和依赖项：

var aws = require('aws-sdk'),
    s3 = new aws.S3(),
    fs = require('fs'),
    fstream = require('fstream'),
    zlib = require('zlib'),
    tar = require('tar'),
    key = 'test',
    bucket = 'mybucket';

精简上传代码：

var params = {
    Bucket: bucket,
    Key: key,
    Body: body
};
s3.upload(params)
    .send(function(err, data) {
            console.log("data:", data);
        }
    });

存储文件，未压缩：

body = fs.createReadStream('/var/www/file.txt');

body = fs.createReadStream('/var/www/file.txt')
    .pipe(zlib.createGzip());

body = fstream.Reader({type: "Directory", path: "/var/www"})
    .pipe(tar.Pack())
    .pipe(zlib.Gzip());

存储文件，压缩：

body = fs.createReadStream('/var/www/file.txt');

body = fs.createReadStream('/var/www/file.txt')
    .pipe(zlib.createGzip());

body = fstream.Reader({type: "Directory", path: "/var/www"})
    .pipe(tar.Pack())
    .pipe(zlib.Gzip());

存储目录，压缩：

body = fs.createReadStream('/var/www/file.txt');

body = fs.createReadStream('/var/www/file.txt')
    .pipe(zlib.createGzip());

body = fstream.Reader({type: "Directory", path: "/var/www"})
    .pipe(tar.Pack())
    .pipe(zlib.Gzip());

存储目录，未压缩（不工作）：

body = fstream.Reader({type: "Directory", path: "/var/www"})
    .pipe(tar.Pack());

我得到的错误是：

node_modules/aws-sdk/lib/s3/managed_upload.js:346
    var buf = self.body.read(self.partSize - self.partBuffer.length) ||
                        ^
TypeError: undefined is not a function
    at ManagedUpload.fillStream (node_modules/aws-sdk/lib/s3/managed_upload.js:346:25)
    at Pack.<anonymous> (node_modules/aws-sdk/lib/s3/managed_upload.js:167:28)
    at Pack.emit (events.js:129:20)
    at Pack._process (node_modules/tar/lib/pack.js:121:8)
    at Pack.end (node_modules/tar/lib/pack.js:87:8)
    at DirReader.onend (stream.js:79:10)
    at DirReader.emit (events.js:129:20)
    at DirReader._read (node_modules/fstream/lib/dir-reader.js:82:10)
    at FileReader.onend (node_modules/fstream/lib/dir-reader.js:172:12)
    at FileReader.emit (events.js:129:20)

node_modules/aws sdk/lib/s3/managed_upload.js:346
var buf=self.body.read（self.partSize-self.partBuffer.length）||
^
TypeError:undefined不是函数
在ManagedUpload.fillStream（node_modules/aws sdk/lib/s3/managed_upload.js:346:25）
打包。（node_modules/aws sdk/lib/s3/managed_upload.js:167:28）
在Pack.emit（events.js:129:20）
at Pack.\u进程（node\u modules/tar/lib/Pack.js:121:8）
在Pack.end（node_modules/tar/lib/Pack.js:87:8）
在DirReader.onend（stream.js:79:10）
在DirReader.emit（events.js:129:20）
在DirReader.\u read（node\u modules/fstream/lib/dir reader.js:82:10）
在FileReader.onend（node_modules/fstream/lib/dir reader.js:172:12）
在FileReader.emit（events.js:129:20）

我是否需要将tar结果通过管道传输到aws sdk可以处理的东西中，或者什么