// upload will perform a multipart upload using the firstPart buffer containing
// the first chunk of data.
func (u *multiuploader) upload(firstPart []byte) (*UploadOutput, error) {
params := &s3.CreateMultipartUploadInput{}
awsutil.Copy(params, u.in)
// Create the multipart
resp, err := u.s.CreateMultipartUpload(params)
if err != nil {
return nil, err
}
u.uploadID = *resp.UploadID
// Create the workers
ch := make(chan chunk, u.opts.Concurrency)
for i := 0; i < u.opts.Concurrency; i++ {
u.wg.Add(1)
go u.readChunk(ch)
}
// Send part 1 to the workers
var num int64 = 1
ch <- chunk{buf: firstPart, num: num}
// Read and queue the rest of the parts
for u.geterr() == nil {
num++
packet := make([]byte, u.opts.PartSize)
n, err := io.ReadFull(u.in.Body, packet)
ch <- chunk{buf: packet[0:n], num: num}
if err != nil {
if err != io.EOF && err != io.ErrUnexpectedEOF {
u.seterr(apierr.New("ReadRequestBody", "read multipart upload data failed", err))
}
break
}
}
// Close the channel, wait for workers, and complete upload
close(ch)
u.wg.Wait()
complete := u.complete()
if err := u.geterr(); err != nil {
return nil, &multiUploadError{
BaseError: apierr.New("MultipartUpload", "upload multipart failed", err),
uploadID: u.uploadID,
}
}
return &UploadOutput{
Location: *complete.Location,
UploadID: u.uploadID,
}, nil
}
// singlePart contains upload logic for uploading a single chunk via
// a regular PutObject request. Multipart requests require at least two
// parts, or at least 5MB of data.
func (u *uploader) singlePart(part []byte) (*UploadOutput, error) {
params := &s3.PutObjectInput{}
awsutil.Copy(params, u.in)
params.Body = bytes.NewReader(part)
req, _ := u.s.PutObjectRequest(params)
if err := req.Send(); err != nil {
return nil, err
}
url := req.HTTPRequest.URL.String()
return &UploadOutput{Location: url}, nil
}