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package azure
import (
"context"
"crypto/rand"
"encoding/base64"
"errors"
"fmt"
"github.com/Azure/azure-pipeline-go/pipeline"
. "github.com/Azure/azure-storage-blob-go/azblob"
"io"
"sync"
)
// copied from https://github.com/Azure/azure-storage-blob-go/blob/master/azblob/highlevel.go#L73:6
// uploadReaderAtToBlockBlob was not public
// uploadReaderAtToBlockBlob uploads a buffer in blocks to a block blob.
func uploadReaderAtToBlockBlob(ctx context.Context, reader io.ReaderAt, readerSize int64,
blockBlobURL BlockBlobURL, o UploadToBlockBlobOptions) (CommonResponse, error) {
if o.BlockSize == 0 {
// If bufferSize > (BlockBlobMaxStageBlockBytes * BlockBlobMaxBlocks), then error
if readerSize > BlockBlobMaxStageBlockBytes*BlockBlobMaxBlocks {
return nil, errors.New("buffer is too large to upload to a block blob")
}
// If bufferSize <= BlockBlobMaxUploadBlobBytes, then Upload should be used with just 1 I/O request
if readerSize <= BlockBlobMaxUploadBlobBytes {
o.BlockSize = BlockBlobMaxUploadBlobBytes // Default if unspecified
} else {
o.BlockSize = readerSize / BlockBlobMaxBlocks // buffer / max blocks = block size to use all 50,000 blocks
if o.BlockSize < BlobDefaultDownloadBlockSize { // If the block size is smaller than 4MB, round up to 4MB
o.BlockSize = BlobDefaultDownloadBlockSize
}
// StageBlock will be called with blockSize blocks and a Parallelism of (BufferSize / BlockSize).
}
}
if readerSize <= BlockBlobMaxUploadBlobBytes {
// If the size can fit in 1 Upload call, do it this way
var body io.ReadSeeker = io.NewSectionReader(reader, 0, readerSize)
if o.Progress != nil {
body = pipeline.NewRequestBodyProgress(body, o.Progress)
}
return blockBlobURL.Upload(ctx, body, o.BlobHTTPHeaders, o.Metadata, o.AccessConditions, o.BlobAccessTier, o.BlobTagsMap, o.ClientProvidedKeyOptions)
}
var numBlocks = uint16(((readerSize - 1) / o.BlockSize) + 1)
blockIDList := make([]string, numBlocks) // Base-64 encoded block IDs
progress := int64(0)
progressLock := &sync.Mutex{}
err := DoBatchTransfer(ctx, BatchTransferOptions{
OperationName: "uploadReaderAtToBlockBlob",
TransferSize: readerSize,
ChunkSize: o.BlockSize,
Parallelism: o.Parallelism,
Operation: func(offset int64, count int64, ctx context.Context) error {
// This function is called once per block.
// It is passed this block's offset within the buffer and its count of bytes
// Prepare to read the proper block/section of the buffer
var body io.ReadSeeker = io.NewSectionReader(reader, offset, count)
blockNum := offset / o.BlockSize
if o.Progress != nil {
blockProgress := int64(0)
body = pipeline.NewRequestBodyProgress(body,
func(bytesTransferred int64) {
diff := bytesTransferred - blockProgress
blockProgress = bytesTransferred
progressLock.Lock() // 1 goroutine at a time gets a progress report
progress += diff
o.Progress(progress)
progressLock.Unlock()
})
}
// Block IDs are unique values to avoid issue if 2+ clients are uploading blocks
// at the same time causing PutBlockList to get a mix of blocks from all the clients.
blockIDList[blockNum] = base64.StdEncoding.EncodeToString(newUUID().bytes())
_, err := blockBlobURL.StageBlock(ctx, blockIDList[blockNum], body, o.AccessConditions.LeaseAccessConditions, nil, o.ClientProvidedKeyOptions)
return err
},
})
if err != nil {
return nil, err
}
// All put blocks were successful, call Put Block List to finalize the blob
return blockBlobURL.CommitBlockList(ctx, blockIDList, o.BlobHTTPHeaders, o.Metadata, o.AccessConditions, o.BlobAccessTier, o.BlobTagsMap, o.ClientProvidedKeyOptions)
}
// The UUID reserved variants.
const (
reservedNCS byte = 0x80
reservedRFC4122 byte = 0x40
reservedMicrosoft byte = 0x20
reservedFuture byte = 0x00
)
type uuid [16]byte
// NewUUID returns a new uuid using RFC 4122 algorithm.
func newUUID() (u uuid) {
u = uuid{}
// Set all bits to randomly (or pseudo-randomly) chosen values.
rand.Read(u[:])
u[8] = (u[8] | reservedRFC4122) & 0x7F // u.setVariant(ReservedRFC4122)
var version byte = 4
u[6] = (u[6] & 0xF) | (version << 4) // u.setVersion(4)
return
}
// String returns an unparsed version of the generated UUID sequence.
func (u uuid) String() string {
return fmt.Sprintf("%x-%x-%x-%x-%x", u[0:4], u[4:6], u[6:8], u[8:10], u[10:])
}
func (u uuid) bytes() []byte {
return u[:]
}