S3 multipart upload with NodeJS

s3multipart.js

var express = require('express')
var app = express()
var AWS = require('aws-sdk');
var bodyParser = require('body-parser');
var fs = require('fs');
var zlib = require('zlib'); // gzip compression

var multiparty = require('connect-multiparty'),
    multipartyMiddleware = multiparty();

var AWS_ACCESS_KEY = '**';
var AWS_SECRET_KEY = '**';
AWS.config.update({accessKeyId: AWS_ACCESS_KEY, secretAccessKey: AWS_SECRET_KEY});
AWS.config.region = 'us-west-2';

app.use("/public",express.static(__dirname + '/public'));
app.use("/node_modules",express.static(__dirname + '/node_modules'));

// parse application/x-www-form-urlencoded
app.use(bodyParser.urlencoded({ extended: false }))

// parse application/json
app.use(bodyParser.json())

app.post('/s', multipartyMiddleware, function (req, res) {
  var s3 = new AWS.S3();

  var file = req.files.file;
  var buffer = fs.readFileSync(file.path);

  var startTime = new Date();
  var partNum = 0;
  var partSize = 1024 * 1024 * 5; // 5mb chunks except last part
  var numPartsLeft = Math.ceil(buffer.length / partSize);
  var maxUploadTries = 3;

  var multipartParams = {
    Bucket: 'videos.imstillreallybored',
    Key: file.name,
    ContentType: file.type
  };

  var multipartMap = {
    Parts: []
  };

  console.log('Creating multipart upload for:', file.name);
  s3.createMultipartUpload(multipartParams, function(mpErr, multipart) {
    if (mpErr) return console.error('Error!', mpErr);
    console.log('Got upload ID', multipart.UploadId);

    for (var start = 0; start < buffer.length; start += partSize) {
      partNum++;
      var end = Math.min(start + partSize, buffer.length);
      var partParams = {
        Body: buffer.slice(start, end),
        Bucket: multipartParams.Bucket,
        Key: multipartParams.Key,
        PartNumber: String(partNum),
        UploadId: multipart.UploadId
      };

      console.log('Uploading part: #', partParams.PartNumber, ', Start:', start);
      uploadPart(s3, multipart, partParams);
    }
  });

  function completeMultipartUpload(s3, doneParams) {
    s3.completeMultipartUpload(doneParams, function(err, data) {
      if (err) return console.error('An error occurred while completing multipart upload');
      var delta = (new Date() - startTime) / 1000;
      console.log('Completed upload in', delta, 'seconds');
      console.log('Final upload data:', data);
    });
  }

  function uploadPart(s3, multipart, partParams, tryNum) {
    var tryNum = tryNum || 1;
    s3.uploadPart(partParams, function(multiErr, mData) {
      console.log('started');
      if (multiErr) {
        console.log('Upload part error:', multiErr);

        if (tryNum < maxUploadTries) {
          console.log('Retrying upload of part: #', partParams.PartNumber);
          uploadPart(s3, multipart, partParams, tryNum + 1);
        } else {
          console.log('Failed uploading part: #', partParams.PartNumber);
        }
        // return;
      }

      multipartMap.Parts[this.request.params.PartNumber - 1] = {
        ETag: mData.ETag,
        PartNumber: Number(this.request.params.PartNumber)
      };
      console.log('Completed part', this.request.params.PartNumber);
      console.log('mData', mData);
      if (--numPartsLeft > 0) return; // complete only when all parts uploaded

      var doneParams = {
        Bucket: multipartParams.Bucket,
        Key: multipartParams.Key,
        MultipartUpload: multipartMap,
        UploadId: multipart.UploadId
      };

      console.log('Completing upload...');
      completeMultipartUpload(s3, doneParams);
    }).on('httpUploadProgress', function(progress) {  console.log(Math.round(progress.loaded/progress.total*100)+ '% done') });
  }

  // console.log(stream);
  // s3.upload(params).
  //   on('httpUploadProgress', function(progress) { console.log(progress); }).
  //   send(function(err, data) { console.log(err, data) });
	// var s3 = new AWS.S3();
	// var params = {Bucket: 'videos.imstillreallybored', Key: req.body.name, ContentType: req.body.type};
	// s3.getSignedUrl('putObject', params, function(err, url) {
	// 	if(err) console.log(err);
	// 	res.json({url: url});
  //
	// });
  // console.log(Math.round(progress.loaded/progress.total*100)+ '% done')
})


var server = app.listen(3000, function () {

  var host = server.address().address
  var port = server.address().port

  console.log('Example app listening at http://%s:%s', host, port)

})

Thank you for the script. I adapted it to allow copying files over 5GB from one bucket to another in a memory efficient manner.

function copyS3MP(from_bucket, from_key, to_bucket, to_key) {
    const AWS = require('aws-sdk');
    AWS.config.update({region: 'us-west-2'});

    let s3 = new AWS.S3();

    let head, uploadId, numParts, fileSize;

    let startTime = new Date();
    let partNum = 0;
    let partSize = 1024 * 1024 * 10; // 10mb chunks except last part
    let maxUploadTries = 3;

    let multiPartParams = {
        Bucket: to_bucket,
        Key: to_key,
        ContentType: getContentType(to_key)
    };

    let multipartMap = {
        Parts: []
    };

    function getHead() {
        return new Promise(async (resolve, reject) => {
            try {
                const h = await s3.headObject({
                    Bucket: from_bucket,
                    Key: from_key
                }).promise();

                resolve(h);
            } catch (e) {
                reject(e);
            }
        });
    }

    function createMultipartUpload() {
        return new Promise(async (resolve, reject) => {
            try {
                s3.createMultipartUpload(multiPartParams, function(mpErr, multipart) {
                    if (mpErr) {
                        console.error(mpErr);
                        return reject(mpErr);
                    }

                    console.log('Got upload ID', multipart.UploadId);

                    return resolve(multipart.UploadId);
                });
            } catch (e) {
                reject(e);
            }
        });
    }

    function copyPart(start, partNum) {
        let tryNum = 1;

        function copyLogic(copyParams) {
            return new Promise((resolve, reject) => {
                s3.uploadPartCopy(copyParams, function(multiErr, mData) {
                    if (multiErr) {
                        console.log('Upload part error:', multiErr);
                        return reject(multiErr);
                    } else {
                        multipartMap.Parts[this.request.params.PartNumber - 1] = {
                            ETag: mData.ETag,
                            PartNumber: Number(this.request.params.PartNumber)
                        };

                        console.log('Completed part', this.request.params.PartNumber);
                        console.log('mData', mData);

                        return resolve();
                    }
                }).on('httpUploadProgress', function(progress) {  console.log(Math.round(progress.loaded/progress.total*100)+ '% done') });
            });
        }

        return new Promise(async (resolve, reject) => {
            let end = Math.min(start + partSize, fileSize);

            try {
                let partParams = {
                    Bucket: to_bucket,
                    Key: to_key,
                    PartNumber: String(partNum),
                    UploadId: uploadId,
                    CopySource: `${from_bucket}/${from_key}`,
                    CopySourceRange: `bytes=${start}-${end - 1}`
                };

                while (tryNum <= maxUploadTries) {
                    try {
                        await copyLogic(partParams);
                        return resolve();
                    } catch (e) {
                        tryNum++;
                        if (tryNum <= maxUploadTries) {
                            console.log('Retrying copy of part: #', partParams.PartNumber);
                            await module.exports.sleep(1);
                        } else {
                            console.log('Failed uploading part: #', partParams.PartNumber);
                            return reject(e);
                        }
                    }
                }

                resolve();
            } catch (e) {
                return reject(e);
            }
        });
    }

    function completeMultipartUpload() {
        return new Promise((resolve, reject) => {
            let doneParams = {
                Bucket: to_bucket,
                Key: to_key,
                MultipartUpload: multipartMap,
                UploadId: uploadId
            };

            s3.completeMultipartUpload(doneParams, function(err, data) {
                if (err) {
                    return reject(err);
                }

                var delta = (new Date() - startTime) / 1000;
                console.log('Completed upload in', delta, 'seconds');
                console.log('Final upload data:', data);

                return resolve();
            });
        });
    }

    return new Promise(async (resolve, reject) => {
        try {
            head = await getHead();
            fileSize = head.ContentLength;
        } catch (e) {
            return reject(e);
        }

        numParts = Math.ceil(fileSize / partSize);

        console.log('Creating multipart upload for:', to_key);

        try {
            uploadId = await createMultipartUpload();
        } catch (e) {
            return reject(e);
        }

        for (let start = 0; start < fileSize; start += partSize) {
            partNum++;
            console.log("Part Num: " + partNum);

            try {
                await copyPart(start, partNum);
            } catch (e) {
                console.error(e);
                return reject(e);
            }
        }

        try {
            await completeMultipartUpload();
        } catch (e) {
            return reject(e);
        }

        resolve();
    });
}

Hi,
While using S3Multipart upload functionality, I am facing a issue with the ETag null for one of the part and the script execution fails.
Error:

Upload part error: { 
RequestTimeTooSkewed: The difference between the request time and the current time is too large,
message:
   'The difference between the request time and the current time is too large.',
  code: 'RequestTimeTooSkewed',
  region: null,
  time: 2020-08-18T16:08:46.209Z,
  requestId: 'B2F9C493F61440E3',
  extendedRequestId:
   'mIP9HfZoqxZVBWaDtj900m/KwIA2uLu2oyWrfp7GnJhj7hg8mygRJVEdOS3TYMp/QSuj4mLhjPc=',
  cfId: undefined,
  statusCode: 403,
  retryable: false,
  retryDelay: 28.44339801766571 
}

Has anyone come across such error ?

Hey @egekhter, was just looking at your code, wondering where is the getContentType(to_key) method coming from?

Just one question. Does this occupy the nodejs server's diskspace during the upload process?

Wrote part of this script in a less verbose way
https://gist.github.com/danicunhac/b458cf1fbb40482b74254f18c8492ad3