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upload.go
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package s3manager
import (
"bytes"
"fmt"
"io"
"sort"
"sync"
"time"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/awsutil"
"github.com/aws/aws-sdk-go/aws/client"
"github.com/aws/aws-sdk-go/aws/request"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/aws/aws-sdk-go/service/s3/s3iface"
)
// MaxUploadParts is the maximum allowed number of parts in a multi-part upload
// on Amazon S3.
const MaxUploadParts = 10000
// MinUploadPartSize is the minimum allowed part size when uploading a part to
// Amazon S3.
const MinUploadPartSize int64 = 1024 * 1024 * 5
// DefaultUploadPartSize is the default part size to buffer chunks of a
// payload into.
const DefaultUploadPartSize = MinUploadPartSize
// DefaultUploadConcurrency is the default number of goroutines to spin up when
// using Upload().
const DefaultUploadConcurrency = 5
// A MultiUploadFailure wraps a failed S3 multipart upload. An error returned
// will satisfy this interface when a multi part upload failed to upload all
// chucks to S3. In the case of a failure the UploadID is needed to operate on
// the chunks, if any, which were uploaded.
//
// Example:
//
// u := s3manager.NewUploader(opts)
// output, err := u.upload(input)
// if err != nil {
// if multierr, ok := err.(s3manager.MultiUploadFailure); ok {
// // Process error and its associated uploadID
// fmt.Println("Error:", multierr.Code(), multierr.Message(), multierr.UploadID())
// } else {
// // Process error generically
// fmt.Println("Error:", err.Error())
// }
// }
//
type MultiUploadFailure interface {
awserr.Error
// Returns the upload id for the S3 multipart upload that failed.
UploadID() string
}
// So that the Error interface type can be included as an anonymous field
// in the multiUploadError struct and not conflict with the error.Error() method.
type awsError awserr.Error
// A multiUploadError wraps the upload ID of a failed s3 multipart upload.
// Composed of BaseError for code, message, and original error
//
// Should be used for an error that occurred failing a S3 multipart upload,
// and a upload ID is available. If an uploadID is not available a more relevant
type multiUploadError struct {
awsError
// ID for multipart upload which failed.
uploadID string
}
// Error returns the string representation of the error.
//
// See apierr.BaseError ErrorWithExtra for output format
//
// Satisfies the error interface.
func (m multiUploadError) Error() string {
extra := fmt.Sprintf("upload id: %s", m.uploadID)
return awserr.SprintError(m.Code(), m.Message(), extra, m.OrigErr())
}
// String returns the string representation of the error.
// Alias for Error to satisfy the stringer interface.
func (m multiUploadError) String() string {
return m.Error()
}
// UploadID returns the id of the S3 upload which failed.
func (m multiUploadError) UploadID() string {
return m.uploadID
}
// UploadInput contains all input for upload requests to Amazon S3.
type UploadInput struct {
// The canned ACL to apply to the object.
ACL *string `location:"header" locationName:"x-amz-acl" type:"string"`
Bucket *string `location:"uri" locationName:"Bucket" type:"string" required:"true"`
// Specifies caching behavior along the request/reply chain.
CacheControl *string `location:"header" locationName:"Cache-Control" type:"string"`
// Specifies presentational information for the object.
ContentDisposition *string `location:"header" locationName:"Content-Disposition" type:"string"`
// Specifies what content encodings have been applied to the object and thus
// what decoding mechanisms must be applied to obtain the media-type referenced
// by the Content-Type header field.
ContentEncoding *string `location:"header" locationName:"Content-Encoding" type:"string"`
// The language the content is in.
ContentLanguage *string `location:"header" locationName:"Content-Language" type:"string"`
// A standard MIME type describing the format of the object data.
ContentType *string `location:"header" locationName:"Content-Type" type:"string"`
// The date and time at which the object is no longer cacheable.
Expires *time.Time `location:"header" locationName:"Expires" type:"timestamp" timestampFormat:"rfc822"`
// Gives the grantee READ, READ_ACP, and WRITE_ACP permissions on the object.
GrantFullControl *string `location:"header" locationName:"x-amz-grant-full-control" type:"string"`
// Allows grantee to read the object data and its metadata.
GrantRead *string `location:"header" locationName:"x-amz-grant-read" type:"string"`
// Allows grantee to read the object ACL.
GrantReadACP *string `location:"header" locationName:"x-amz-grant-read-acp" type:"string"`
// Allows grantee to write the ACL for the applicable object.
GrantWriteACP *string `location:"header" locationName:"x-amz-grant-write-acp" type:"string"`
Key *string `location:"uri" locationName:"Key" type:"string" required:"true"`
// A map of metadata to store with the object in S3.
Metadata map[string]*string `location:"headers" locationName:"x-amz-meta-" type:"map"`
// Confirms that the requester knows that she or he will be charged for the
// request. Bucket owners need not specify this parameter in their requests.
// Documentation on downloading objects from requester pays buckets can be found
// at http://docs.aws.amazon.com/AmazonS3/latest/dev/ObjectsinRequesterPaysBuckets.html
RequestPayer *string `location:"header" locationName:"x-amz-request-payer" type:"string"`
// Specifies the algorithm to use to when encrypting the object (e.g., AES256,
// aws:kms).
SSECustomerAlgorithm *string `location:"header" locationName:"x-amz-server-side-encryption-customer-algorithm" type:"string"`
// Specifies the customer-provided encryption key for Amazon S3 to use in encrypting
// data. This value is used to store the object and then it is discarded; Amazon
// does not store the encryption key. The key must be appropriate for use with
// the algorithm specified in the x-amz-server-side-encryption-customer-algorithm
// header.
SSECustomerKey *string `location:"header" locationName:"x-amz-server-side-encryption-customer-key" type:"string"`
// Specifies the 128-bit MD5 digest of the encryption key according to RFC 1321.
// Amazon S3 uses this header for a message integrity check to ensure the encryption
// key was transmitted without error.
SSECustomerKeyMD5 *string `location:"header" locationName:"x-amz-server-side-encryption-customer-key-MD5" type:"string"`
// Specifies the AWS KMS key ID to use for object encryption. All GET and PUT
// requests for an object protected by AWS KMS will fail if not made via SSL
// or using SigV4. Documentation on configuring any of the officially supported
// AWS SDKs and CLI can be found at http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingAWSSDK.html#specify-signature-version
SSEKMSKeyId *string `location:"header" locationName:"x-amz-server-side-encryption-aws-kms-key-id" type:"string"`
// The Server-side encryption algorithm used when storing this object in S3
// (e.g., AES256, aws:kms).
ServerSideEncryption *string `location:"header" locationName:"x-amz-server-side-encryption" type:"string"`
// The type of storage to use for the object. Defaults to 'STANDARD'.
StorageClass *string `location:"header" locationName:"x-amz-storage-class" type:"string"`
// If the bucket is configured as a website, redirects requests for this object
// to another object in the same bucket or to an external URL. Amazon S3 stores
// the value of this header in the object metadata.
WebsiteRedirectLocation *string `location:"header" locationName:"x-amz-website-redirect-location" type:"string"`
// The readable body payload to send to S3.
Body io.Reader
}
// UploadOutput represents a response from the Upload() call.
type UploadOutput struct {
// The URL where the object was uploaded to.
Location string
// The version of the object that was uploaded. Will only be populated if
// the S3 Bucket is versioned. If the bucket is not versioned this field
// will not be set.
VersionID *string
// The ID for a multipart upload to S3. In the case of an error the error
// can be cast to the MultiUploadFailure interface to extract the upload ID.
UploadID string
}
// The Uploader structure that calls Upload(). It is safe to call Upload()
// on this structure for multiple objects and across concurrent goroutines.
// Mutating the Uploader's properties is not safe to be done concurrently.
type Uploader struct {
// The buffer size (in bytes) to use when buffering data into chunks and
// sending them as parts to S3. The minimum allowed part size is 5MB, and
// if this value is set to zero, the DefaultPartSize value will be used.
PartSize int64
// The number of goroutines to spin up in parallel when sending parts.
// If this is set to zero, the DefaultUploadConcurrency value will be used.
Concurrency int
// Setting this value to true will cause the SDK to avoid calling
// AbortMultipartUpload on a failure, leaving all successfully uploaded
// parts on S3 for manual recovery.
//
// Note that storing parts of an incomplete multipart upload counts towards
// space usage on S3 and will add additional costs if not cleaned up.
LeavePartsOnError bool
// MaxUploadParts is the max number of parts which will be uploaded to S3.
// Will be used to calculate the partsize of the object to be uploaded.
// E.g: 5GB file, with MaxUploadParts set to 100, will upload the file
// as 100, 50MB parts.
// With a limited of s3.MaxUploadParts (10,000 parts).
MaxUploadParts int
// The client to use when uploading to S3.
S3 s3iface.S3API
}
// NewUploader creates a new Uploader instance to upload objects to S3. Pass In
// additional functional options to customize the uploader's behavior. Requires a
// client.ConfigProvider in order to create a S3 service client. The session.Session
// satisfies the client.ConfigProvider interface.
//
// Example:
// // The session the S3 Uploader will use
// sess := session.New()
//
// // Create an uploader with the session and default options
// uploader := s3manager.NewUploader(sess)
//
// // Create an uploader with the session and custom options
// uploader := s3manager.NewUploader(session, func(u *s3manager.Uploader) {
// u.PartSize = 64 * 1024 * 1024 // 64MB per part
// })
func NewUploader(c client.ConfigProvider, options ...func(*Uploader)) *Uploader {
u := &Uploader{
S3: s3.New(c),
PartSize: DefaultUploadPartSize,
Concurrency: DefaultUploadConcurrency,
LeavePartsOnError: false,
MaxUploadParts: MaxUploadParts,
}
for _, option := range options {
option(u)
}
return u
}
// NewUploaderWithClient creates a new Uploader instance to upload objects to S3. Pass in
// additional functional options to customize the uploader's behavior. Requires
// a S3 service client to make S3 API calls.
//
// Example:
// // S3 service client the Upload manager will use.
// s3Svc := s3.New(session.New())
//
// // Create an uploader with S3 client and default options
// uploader := s3manager.NewUploaderWithClient(s3Svc)
//
// // Create an uploader with S3 client and custom options
// uploader := s3manager.NewUploaderWithClient(s3Svc, func(u *s3manager.Uploader) {
// u.PartSize = 64 * 1024 * 1024 // 64MB per part
// })
func NewUploaderWithClient(svc s3iface.S3API, options ...func(*Uploader)) *Uploader {
u := &Uploader{
S3: svc,
PartSize: DefaultUploadPartSize,
Concurrency: DefaultUploadConcurrency,
LeavePartsOnError: false,
MaxUploadParts: MaxUploadParts,
}
for _, option := range options {
option(u)
}
return u
}
// Upload uploads an object to S3, intelligently buffering large files into
// smaller chunks and sending them in parallel across multiple goroutines. You
// can configure the buffer size and concurrency through the Uploader's parameters.
//
// Additional functional options can be provided to configure the individual
// upload. These options are copies of the Uploader instance Upload is called from.
// Modifying the options will not impact the original Uploader instance.
//
// It is safe to call this method concurrently across goroutines.
//
// Example:
// // Upload input parameters
// upParams := &s3manager.UploadInput{
// Bucket: &bucketName,
// Key: &keyName,
// Body: file,
// }
//
// // Perform an upload.
// result, err := uploader.Upload(upParams)
//
// // Perform upload with options different than the those in the Uploader.
// result, err := uploader.Upload(upParams, func(u *s3manager.Uploader) {
// u.PartSize = 10 * 1024 * 1024 // 10MB part size
// u.LeavePartsOnError = true // Dont delete the parts if the upload fails.
// })
func (u Uploader) Upload(input *UploadInput, options ...func(*Uploader)) (*UploadOutput, error) {
i := uploader{in: input, ctx: u}
for _, option := range options {
option(&i.ctx)
}
return i.upload()
}
// internal structure to manage an upload to S3.
type uploader struct {
ctx Uploader
in *UploadInput
readerPos int64 // current reader position
totalSize int64 // set to -1 if the size is not known
}
// internal logic for deciding whether to upload a single part or use a
// multipart upload.
func (u *uploader) upload() (*UploadOutput, error) {
u.init()
if u.ctx.PartSize < MinUploadPartSize {
msg := fmt.Sprintf("part size must be at least %d bytes", MinUploadPartSize)
return nil, awserr.New("ConfigError", msg, nil)
}
// Do one read to determine if we have more than one part
buf, err := u.nextReader()
if err == io.EOF || err == io.ErrUnexpectedEOF { // single part
return u.singlePart(buf)
} else if err != nil {
return nil, awserr.New("ReadRequestBody", "read upload data failed", err)
}
mu := multiuploader{uploader: u}
return mu.upload(buf)
}
// init will initialize all default options.
func (u *uploader) init() {
if u.ctx.Concurrency == 0 {
u.ctx.Concurrency = DefaultUploadConcurrency
}
if u.ctx.PartSize == 0 {
u.ctx.PartSize = DefaultUploadPartSize
}
// Try to get the total size for some optimizations
u.initSize()
}
// initSize tries to detect the total stream size, setting u.totalSize. If
// the size is not known, totalSize is set to -1.
func (u *uploader) initSize() {
u.totalSize = -1
switch r := u.in.Body.(type) {
case io.Seeker:
pos, _ := r.Seek(0, 1)
defer r.Seek(pos, 0)
n, err := r.Seek(0, 2)
if err != nil {
return
}
u.totalSize = n
// Try to adjust partSize if it is too small and account for
// integer division truncation.
if u.totalSize/u.ctx.PartSize >= int64(u.ctx.MaxUploadParts) {
// Add one to the part size to account for remainders
// during the size calculation. e.g odd number of bytes.
u.ctx.PartSize = (u.totalSize / int64(u.ctx.MaxUploadParts)) + 1
}
}
}
// nextReader returns a seekable reader representing the next packet of data.
// This operation increases the shared u.readerPos counter, but note that it
// does not need to be wrapped in a mutex because nextReader is only called
// from the main thread.
func (u *uploader) nextReader() (io.ReadSeeker, error) {
switch r := u.in.Body.(type) {
case io.ReaderAt:
var err error
n := u.ctx.PartSize
if u.totalSize >= 0 {
bytesLeft := u.totalSize - u.readerPos
if bytesLeft == 0 {
err = io.EOF
n = bytesLeft
} else if bytesLeft <= u.ctx.PartSize {
err = io.ErrUnexpectedEOF
n = bytesLeft
}
}
buf := io.NewSectionReader(r, u.readerPos, n)
u.readerPos += n
return buf, err
default:
packet := make([]byte, u.ctx.PartSize)
n, err := io.ReadFull(u.in.Body, packet)
u.readerPos += int64(n)
return bytes.NewReader(packet[0:n]), err
}
}
// 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(buf io.ReadSeeker) (*UploadOutput, error) {
params := &s3.PutObjectInput{}
awsutil.Copy(params, u.in)
params.Body = buf
req, out := u.ctx.S3.PutObjectRequest(params)
req.Handlers.Build.PushBack(request.MakeAddToUserAgentFreeFormHandler("S3Manager"))
if err := req.Send(); err != nil {
return nil, err
}
url := req.HTTPRequest.URL.String()
return &UploadOutput{
Location: url,
VersionID: out.VersionId,
}, nil
}
// internal structure to manage a specific multipart upload to S3.
type multiuploader struct {
*uploader
wg sync.WaitGroup
m sync.Mutex
err error
uploadID string
parts completedParts
}
// keeps track of a single chunk of data being sent to S3.
type chunk struct {
buf io.ReadSeeker
num int64
}
// completedParts is a wrapper to make parts sortable by their part number,
// since S3 required this list to be sent in sorted order.
type completedParts []*s3.CompletedPart
func (a completedParts) Len() int { return len(a) }
func (a completedParts) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a completedParts) Less(i, j int) bool { return *a[i].PartNumber < *a[j].PartNumber }
// upload will perform a multipart upload using the firstBuf buffer containing
// the first chunk of data.
func (u *multiuploader) upload(firstBuf io.ReadSeeker) (*UploadOutput, error) {
params := &s3.CreateMultipartUploadInput{}
awsutil.Copy(params, u.in)
// Create the multipart
req, resp := u.ctx.S3.CreateMultipartUploadRequest(params)
req.Handlers.Build.PushBack(request.MakeAddToUserAgentFreeFormHandler("S3Manager"))
if err := req.Send(); err != nil {
return nil, err
}
u.uploadID = *resp.UploadId
// Create the workers
ch := make(chan chunk, u.ctx.Concurrency)
for i := 0; i < u.ctx.Concurrency; i++ {
u.wg.Add(1)
go u.readChunk(ch)
}
// Send part 1 to the workers
var num int64 = 1
ch <- chunk{buf: firstBuf, num: num}
// Read and queue the rest of the parts
for u.geterr() == nil {
num++
// This upload exceeded maximum number of supported parts, error now.
if num > int64(u.ctx.MaxUploadParts) || num > int64(MaxUploadParts) {
var msg string
if num > int64(u.ctx.MaxUploadParts) {
msg = fmt.Sprintf("exceeded total allowed configured MaxUploadParts (%d). Adjust PartSize to fit in this limit",
u.ctx.MaxUploadParts)
} else {
msg = fmt.Sprintf("exceeded total allowed S3 limit MaxUploadParts (%d). Adjust PartSize to fit in this limit",
MaxUploadParts)
}
u.seterr(awserr.New("TotalPartsExceeded", msg, nil))
break
}
buf, err := u.nextReader()
if err == io.EOF {
break
}
ch <- chunk{buf: buf, num: num}
if err == io.ErrUnexpectedEOF {
break
} else if err != nil {
u.seterr(awserr.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{
awsError: awserr.New(
"MultipartUpload",
"upload multipart failed",
err),
uploadID: u.uploadID,
}
}
return &UploadOutput{
Location: *complete.Location,
VersionID: complete.VersionId,
UploadID: u.uploadID,
}, nil
}
// readChunk runs in worker goroutines to pull chunks off of the ch channel
// and send() them as UploadPart requests.
func (u *multiuploader) readChunk(ch chan chunk) {
defer u.wg.Done()
for {
data, ok := <-ch
if !ok {
break
}
if u.geterr() == nil {
if err := u.send(data); err != nil {
u.seterr(err)
}
}
}
}
// send performs an UploadPart request and keeps track of the completed
// part information.
func (u *multiuploader) send(c chunk) error {
req, resp := u.ctx.S3.UploadPartRequest(&s3.UploadPartInput{
Bucket: u.in.Bucket,
Key: u.in.Key,
Body: c.buf,
UploadId: &u.uploadID,
PartNumber: &c.num,
})
req.Handlers.Build.PushBack(request.MakeAddToUserAgentFreeFormHandler("S3Manager"))
if err := req.Send(); err != nil {
return err
}
n := c.num
completed := &s3.CompletedPart{ETag: resp.ETag, PartNumber: &n}
u.m.Lock()
u.parts = append(u.parts, completed)
u.m.Unlock()
return nil
}
// geterr is a thread-safe getter for the error object
func (u *multiuploader) geterr() error {
u.m.Lock()
defer u.m.Unlock()
return u.err
}
// seterr is a thread-safe setter for the error object
func (u *multiuploader) seterr(e error) {
u.m.Lock()
defer u.m.Unlock()
u.err = e
}
// fail will abort the multipart unless LeavePartsOnError is set to true.
func (u *multiuploader) fail() {
if u.ctx.LeavePartsOnError {
return
}
req, _ := u.ctx.S3.AbortMultipartUploadRequest(&s3.AbortMultipartUploadInput{
Bucket: u.in.Bucket,
Key: u.in.Key,
UploadId: &u.uploadID,
})
req.Handlers.Build.PushBack(request.MakeAddToUserAgentFreeFormHandler("S3Manager"))
req.Send()
}
// complete successfully completes a multipart upload and returns the response.
func (u *multiuploader) complete() *s3.CompleteMultipartUploadOutput {
if u.geterr() != nil {
u.fail()
return nil
}
// Parts must be sorted in PartNumber order.
sort.Sort(u.parts)
req, resp := u.ctx.S3.CompleteMultipartUploadRequest(&s3.CompleteMultipartUploadInput{
Bucket: u.in.Bucket,
Key: u.in.Key,
UploadId: &u.uploadID,
MultipartUpload: &s3.CompletedMultipartUpload{Parts: u.parts},
})
req.Handlers.Build.PushBack(request.MakeAddToUserAgentFreeFormHandler("S3Manager"))
if err := req.Send(); err != nil {
u.seterr(err)
u.fail()
}
return resp
}