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Merge pull request #76 from ahmetalpbalkan/azure-fixes 

storagedriver/azure: fix azure storage driver methods, implement Stat
master
Stephen Day 2015-02-10 15:02:48 -08:00
parent 4be40d16eb d606948fd7
commit 34c09cb56c
18 changed files with 3819 additions and 120 deletions
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5
Godeps/Godeps.json generated
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@ -22,6 +22,11 @@
"ImportPath": "github.com/AdRoll/goamz/s3",
"Rev": "d3664b76d90508cdda5a6c92042f26eab5db3103"
},
{
"ImportPath": "github.com/MSOpenTech/azure-sdk-for-go/clients/storage",
"Comment": "v1.1-119-g0fbd371",
"Rev": "0fbd37144de3adc2aef74db867c0e15e41c7f74a"
},
{
"ImportPath": "github.com/Sirupsen/logrus",
"Comment": "v0.6.4-12-g467d9d5",

884
Godeps/_workspace/src/github.com/MSOpenTech/azure-sdk-for-go/clients/storage/blob.go generated vendored Normal file
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@ -0,0 +1,884 @@
package storage
import (
"bytes"
"encoding/base64"
"encoding/xml"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"strconv"
"strings"
"time"
)
type BlobStorageClient struct {
client StorageClient
}
// A Container is an entry in ContainerListResponse.
type Container struct {
Name string `xml:"Name"`
Properties ContainerProperties `xml:"Properties"`
// TODO (ahmetalpbalkan) Metadata
}
// ContainerProperties contains various properties of a
// container returned from various endpoints like ListContainers.
type ContainerProperties struct {
LastModified string `xml:"Last-Modified"`
Etag string `xml:"Etag"`
LeaseStatus string `xml:"LeaseStatus"`
LeaseState string `xml:"LeaseState"`
LeaseDuration string `xml:"LeaseDuration"`
// TODO (ahmetalpbalkan) remaining fields
}
// ContainerListResponse contains the response fields from
// ListContainers call. https://msdn.microsoft.com/en-us/library/azure/dd179352.aspx
type ContainerListResponse struct {
XMLName xml.Name `xml:"EnumerationResults"`
Xmlns string `xml:"xmlns,attr"`
Prefix string `xml:"Prefix"`
Marker string `xml:"Marker"`
NextMarker string `xml:"NextMarker"`
MaxResults int64 `xml:"MaxResults"`
Containers []Container `xml:"Containers>Container"`
}
// A Blob is an entry in BlobListResponse.
type Blob struct {
Name string `xml:"Name"`
Properties BlobProperties `xml:"Properties"`
// TODO (ahmetalpbalkan) Metadata
}
// BlobProperties contains various properties of a blob
// returned in various endpoints like ListBlobs or GetBlobProperties.
type BlobProperties struct {
LastModified string `xml:"Last-Modified"`
Etag string `xml:"Etag"`
ContentMD5 string `xml:"Content-MD5"`
ContentLength int64 `xml:"Content-Length"`
ContentType string `xml:"Content-Type"`
ContentEncoding string `xml:"Content-Encoding"`
BlobType BlobType `xml:"x-ms-blob-blob-type"`
SequenceNumber int64 `xml:"x-ms-blob-sequence-number"`
CopyId string `xml:"CopyId"`
CopyStatus string `xml:"CopyStatus"`
CopySource string `xml:"CopySource"`
CopyProgress string `xml:"CopyProgress"`
CopyCompletionTime string `xml:"CopyCompletionTime"`
CopyStatusDescription string `xml:"CopyStatusDescription"`
}
// BlobListResponse contains the response fields from
// ListBlobs call. https://msdn.microsoft.com/en-us/library/azure/dd135734.aspx
type BlobListResponse struct {
XMLName xml.Name `xml:"EnumerationResults"`
Xmlns string `xml:"xmlns,attr"`
Prefix string `xml:"Prefix"`
Marker string `xml:"Marker"`
NextMarker string `xml:"NextMarker"`
MaxResults int64 `xml:"MaxResults"`
Blobs []Blob `xml:"Blobs>Blob"`
}
// ListContainersParameters defines the set of customizable
// parameters to make a List Containers call. https://msdn.microsoft.com/en-us/library/azure/dd179352.aspx
type ListContainersParameters struct {
Prefix string
Marker string
Include string
MaxResults uint
Timeout uint
}
func (p ListContainersParameters) getParameters() url.Values {
out := url.Values{}
if p.Prefix != "" {
out.Set("prefix", p.Prefix)
}
if p.Marker != "" {
out.Set("marker", p.Marker)
}
if p.Include != "" {
out.Set("include", p.Include)
}
if p.MaxResults != 0 {
out.Set("maxresults", fmt.Sprintf("%v", p.MaxResults))
}
if p.Timeout != 0 {
out.Set("timeout", fmt.Sprintf("%v", p.Timeout))
}
return out
}
// ListBlobsParameters defines the set of customizable
// parameters to make a List Blobs call. https://msdn.microsoft.com/en-us/library/azure/dd135734.aspx
type ListBlobsParameters struct {
Prefix string
Delimiter string
Marker string
Include string
MaxResults uint
Timeout uint
}
func (p ListBlobsParameters) getParameters() url.Values {
out := url.Values{}
if p.Prefix != "" {
out.Set("prefix", p.Prefix)
}
if p.Delimiter != "" {
out.Set("delimiter", p.Delimiter)
}
if p.Marker != "" {
out.Set("marker", p.Marker)
}
if p.Include != "" {
out.Set("include", p.Include)
}
if p.MaxResults != 0 {
out.Set("maxresults", fmt.Sprintf("%v", p.MaxResults))
}
if p.Timeout != 0 {
out.Set("timeout", fmt.Sprintf("%v", p.Timeout))
}
return out
}
// BlobType defines the type of the Azure Blob.
type BlobType string
const (
BlobTypeBlock BlobType = "BlockBlob"
BlobTypePage BlobType = "PageBlob"
)
// PageWriteType defines the type updates that are going to be
// done on the page blob.
type PageWriteType string
const (
PageWriteTypeUpdate PageWriteType = "update"
PageWriteTypeClear PageWriteType = "clear"
)
const (
blobCopyStatusPending = "pending"
blobCopyStatusSuccess = "success"
blobCopyStatusAborted = "aborted"
blobCopyStatusFailed = "failed"
)
// BlockListType is used to filter out types of blocks
// in a Get Blocks List call for a block blob. See
// https://msdn.microsoft.com/en-us/library/azure/dd179400.aspx
// for all block types.
type BlockListType string
const (
BlockListTypeAll BlockListType = "all"
BlockListTypeCommitted BlockListType = "committed"
BlockListTypeUncommitted BlockListType = "uncommitted"
)
// ContainerAccessType defines the access level to the container
// from a public request. See https://msdn.microsoft.com/en-us/library/azure/dd179468.aspx
// and "x-ms-blob-public-access" header.
type ContainerAccessType string
const (
ContainerAccessTypePrivate ContainerAccessType = ""
ContainerAccessTypeBlob ContainerAccessType = "blob"
ContainerAccessTypeContainer ContainerAccessType = "container"
)
const (
MaxBlobBlockSize = 4 * 1024 * 1024
MaxBlobPageSize = 4 * 1024 * 1024
)
// BlockStatus defines states a block for a block blob can
// be in.
type BlockStatus string
const (
BlockStatusUncommitted BlockStatus = "Uncommitted"
BlockStatusCommitted BlockStatus = "Committed"
BlockStatusLatest BlockStatus = "Latest"
)
// Block is used to create Block entities for Put Block List
// call.
type Block struct {
Id string
Status BlockStatus
}
// BlockListResponse contains the response fields from
// Get Block List call. https://msdn.microsoft.com/en-us/library/azure/dd179400.aspx
type BlockListResponse struct {
XMLName xml.Name `xml:"BlockList"`
CommittedBlocks []BlockResponse `xml:"CommittedBlocks>Block"`
UncommittedBlocks []BlockResponse `xml:"UncommittedBlocks>Block"`
}
// BlockResponse contains the block information returned
// in the GetBlockListCall.
type BlockResponse struct {
Name string `xml:"Name"`
Size int64 `xml:"Size"`
}
// GetPageRangesResponse contains the reponse fields from
// Get Page Ranges call. https://msdn.microsoft.com/en-us/library/azure/ee691973.aspx
type GetPageRangesResponse struct {
XMLName xml.Name `xml:"PageList"`
PageList []PageRange `xml:"PageRange"`
}
// PageRange contains information about a page of a page blob from
// Get Pages Range call. https://msdn.microsoft.com/en-us/library/azure/ee691973.aspx
type PageRange struct {
Start int64 `xml:"Start"`
End int64 `xml:"End"`
}
var (
ErrNotCreated = errors.New("storage: operation has returned a successful error code other than 201 Created.")
ErrNotAccepted = errors.New("storage: operation has returned a successful error code other than 202 Accepted.")
errBlobCopyAborted = errors.New("storage: blob copy is aborted")
errBlobCopyIdMismatch = errors.New("storage: blob copy id is a mismatch")
)
const errUnexpectedStatus = "storage: was expecting status code: %d, got: %d"
// ListContainers returns the list of containers in a storage account along with
// pagination token and other response details. See https://msdn.microsoft.com/en-us/library/azure/dd179352.aspx
func (b BlobStorageClient) ListContainers(params ListContainersParameters) (ContainerListResponse, error) {
q := mergeParams(params.getParameters(), url.Values{"comp": {"list"}})
uri := b.client.getEndpoint(blobServiceName, "", q)
headers := b.client.getStandardHeaders()
var out ContainerListResponse
resp, err := b.client.exec("GET", uri, headers, nil)
if err != nil {
return out, err
}
err = xmlUnmarshal(resp.body, &out)
return out, err
}
// CreateContainer creates a blob container within the storage account
// with given name and access level. See https://msdn.microsoft.com/en-us/library/azure/dd179468.aspx
// Returns error if container already exists.
func (b BlobStorageClient) CreateContainer(name string, access ContainerAccessType) error {
resp, err := b.createContainer(name, access)
if err != nil {
return err
}
if resp.statusCode != http.StatusCreated {
return ErrNotCreated
}
return nil
}
// CreateContainerIfNotExists creates a blob container if it does not exist. Returns
// true if container is newly created or false if container already exists.
func (b BlobStorageClient) CreateContainerIfNotExists(name string, access ContainerAccessType) (bool, error) {
resp, err := b.createContainer(name, access)
if resp != nil && (resp.statusCode == http.StatusCreated || resp.statusCode == http.StatusConflict) {
return resp.statusCode == http.StatusCreated, nil
}
return false, err
}
func (b BlobStorageClient) createContainer(name string, access ContainerAccessType) (*storageResponse, error) {
verb := "PUT"
uri := b.client.getEndpoint(blobServiceName, pathForContainer(name), url.Values{"restype": {"container"}})
headers := b.client.getStandardHeaders()
headers["Content-Length"] = "0"
if access != "" {
headers["x-ms-blob-public-access"] = string(access)
}
return b.client.exec(verb, uri, headers, nil)
}
// ContainerExists returns true if a container with given name exists
// on the storage account, otherwise returns false.
func (b BlobStorageClient) ContainerExists(name string) (bool, error) {
verb := "HEAD"
uri := b.client.getEndpoint(blobServiceName, pathForContainer(name), url.Values{"restype": {"container"}})
headers := b.client.getStandardHeaders()
resp, err := b.client.exec(verb, uri, headers, nil)
if resp != nil && (resp.statusCode == http.StatusOK || resp.statusCode == http.StatusNotFound) {
return resp.statusCode == http.StatusOK, nil
}
return false, err
}
// DeleteContainer deletes the container with given name on the storage
// account. See https://msdn.microsoft.com/en-us/library/azure/dd179408.aspx
// If the container does not exist returns error.
func (b BlobStorageClient) DeleteContainer(name string) error {
resp, err := b.deleteContainer(name)
if err != nil {
return err
}
if resp.statusCode != http.StatusAccepted {
return ErrNotAccepted
}
return nil
}
// DeleteContainer deletes the container with given name on the storage
// account if it exists. See https://msdn.microsoft.com/en-us/library/azure/dd179408.aspx
// Returns true if container is deleted with this call, or false
// if the container did not exist at the time of the Delete Container operation.
func (b BlobStorageClient) DeleteContainerIfExists(name string) (bool, error) {
resp, err := b.deleteContainer(name)
if resp != nil && (resp.statusCode == http.StatusAccepted || resp.statusCode == http.StatusNotFound) {
return resp.statusCode == http.StatusAccepted, nil
}
return false, err
}
func (b BlobStorageClient) deleteContainer(name string) (*storageResponse, error) {
verb := "DELETE"
uri := b.client.getEndpoint(blobServiceName, pathForContainer(name), url.Values{"restype": {"container"}})
headers := b.client.getStandardHeaders()
return b.client.exec(verb, uri, headers, nil)
}
// ListBlobs returns an object that contains list of blobs in the container,
// pagination token and other information in the response of List Blobs call.
// See https://msdn.microsoft.com/en-us/library/azure/dd135734.aspx
func (b BlobStorageClient) ListBlobs(container string, params ListBlobsParameters) (BlobListResponse, error) {
q := mergeParams(params.getParameters(), url.Values{
"restype": {"container"},
"comp": {"list"}})
uri := b.client.getEndpoint(blobServiceName, pathForContainer(container), q)
headers := b.client.getStandardHeaders()
var out BlobListResponse
resp, err := b.client.exec("GET", uri, headers, nil)
if err != nil {
return out, err
}
err = xmlUnmarshal(resp.body, &out)
return out, err
}
// BlobExists returns true if a blob with given name exists on the
// specified container of the storage account.
func (b BlobStorageClient) BlobExists(container, name string) (bool, error) {
verb := "HEAD"
uri := b.client.getEndpoint(blobServiceName, pathForBlob(container, name), url.Values{})
headers := b.client.getStandardHeaders()
resp, err := b.client.exec(verb, uri, headers, nil)
if resp != nil && (resp.statusCode == http.StatusOK || resp.statusCode == http.StatusNotFound) {
return resp.statusCode == http.StatusOK, nil
}
return false, err
}
// GetBlobUrl gets the canonical URL to the blob with the specified
// name in the specified container. This method does not create a
// publicly accessible URL if the blob or container is private and this
// method does not check if the blob exists.
func (b BlobStorageClient) GetBlobUrl(container, name string) string {
if container == "" {
container = "$root"
}
return b.client.getEndpoint(blobServiceName, pathForBlob(container, name), url.Values{})
}
// GetBlob downloads a blob to a stream. See https://msdn.microsoft.com/en-us/library/azure/dd179440.aspx
func (b BlobStorageClient) GetBlob(container, name string) (io.ReadCloser, error) {
resp, err := b.getBlobRange(container, name, "")
if err != nil {
return nil, err
}
if resp.statusCode != http.StatusOK {
return nil, fmt.Errorf(errUnexpectedStatus, http.StatusOK, resp.statusCode)
}
return resp.body, nil
}
// GetBlobRange reads the specified range of a blob to a stream.
// The bytesRange string must be in a format like "0-", "10-100"
// as defined in HTTP 1.1 spec. See https://msdn.microsoft.com/en-us/library/azure/dd179440.aspx
func (b BlobStorageClient) GetBlobRange(container, name, bytesRange string) (io.ReadCloser, error) {
resp, err := b.getBlobRange(container, name, bytesRange)
if err != nil {
return nil, err
}
if resp.statusCode != http.StatusPartialContent {
return nil, fmt.Errorf(errUnexpectedStatus, http.StatusPartialContent, resp.statusCode)
}
return resp.body, nil
}
func (b BlobStorageClient) getBlobRange(container, name, bytesRange string) (*storageResponse, error) {
verb := "GET"
uri := b.client.getEndpoint(blobServiceName, pathForBlob(container, name), url.Values{})
headers := b.client.getStandardHeaders()
if bytesRange != "" {
headers["Range"] = fmt.Sprintf("bytes=%s", bytesRange)
}
resp, err := b.client.exec(verb, uri, headers, nil)
if err != nil {
return nil, err
}
return resp, err
}
// GetBlobProperties provides various information about the specified
// blob. See https://msdn.microsoft.com/en-us/library/azure/dd179394.aspx
func (b BlobStorageClient) GetBlobProperties(container, name string) (*BlobProperties, error) {
verb := "HEAD"
uri := b.client.getEndpoint(blobServiceName, pathForBlob(container, name), url.Values{})
headers := b.client.getStandardHeaders()
resp, err := b.client.exec(verb, uri, headers, nil)
if err != nil {
return nil, err
}
if resp.statusCode != http.StatusOK {
return nil, fmt.Errorf(errUnexpectedStatus, http.StatusOK, resp.statusCode)
}
var contentLength int64
contentLengthStr := resp.headers.Get("Content-Length")
if contentLengthStr != "" {
contentLength, err = strconv.ParseInt(contentLengthStr, 0, 64)
if err != nil {
return nil, err
}
}
var sequenceNum int64
sequenceNumStr := resp.headers.Get("x-ms-blob-sequence-number")
if sequenceNumStr != "" {
sequenceNum, err = strconv.ParseInt(sequenceNumStr, 0, 64)
if err != nil {
return nil, err
}
}
return &BlobProperties{
LastModified: resp.headers.Get("Last-Modified"),
Etag: resp.headers.Get("Etag"),
ContentMD5: resp.headers.Get("Content-MD5"),
ContentLength: contentLength,
ContentEncoding: resp.headers.Get("Content-Encoding"),
SequenceNumber: sequenceNum,
CopyCompletionTime: resp.headers.Get("x-ms-copy-completion-time"),
CopyStatusDescription: resp.headers.Get("x-ms-copy-status-description"),
CopyId: resp.headers.Get("x-ms-copy-id"),
CopyProgress: resp.headers.Get("x-ms-copy-progress"),
CopySource: resp.headers.Get("x-ms-copy-source"),
CopyStatus: resp.headers.Get("x-ms-copy-status"),
BlobType: BlobType(resp.headers.Get("x-ms-blob-type")),
}, nil
}
// CreateBlockBlob initializes an empty block blob with no blocks.
// See https://msdn.microsoft.com/en-us/library/azure/dd179451.aspx
func (b BlobStorageClient) CreateBlockBlob(container, name string) error {
path := fmt.Sprintf("%s/%s", container, name)
uri := b.client.getEndpoint(blobServiceName, path, url.Values{})
headers := b.client.getStandardHeaders()
headers["x-ms-blob-type"] = string(BlobTypeBlock)
headers["Content-Length"] = fmt.Sprintf("%v", 0)
resp, err := b.client.exec("PUT", uri, headers, nil)
if err != nil {
return err
}
if resp.statusCode != http.StatusCreated {
return ErrNotCreated
}
return nil
}
// PutBlockBlob uploads given stream into a block blob by splitting
// data stream into chunks and uploading as blocks. Commits the block
// list at the end. This is a helper method built on top of PutBlock
// and PutBlockList methods with sequential block ID counting logic.
func (b BlobStorageClient) PutBlockBlob(container, name string, blob io.Reader) error { // TODO (ahmetalpbalkan) consider ReadCloser and closing
return b.putBlockBlob(container, name, blob, MaxBlobBlockSize)
}
func (b BlobStorageClient) putBlockBlob(container, name string, blob io.Reader, chunkSize int) error {
if chunkSize <= 0 || chunkSize > MaxBlobBlockSize {
chunkSize = MaxBlobBlockSize
}
chunk := make([]byte, chunkSize)
n, err := blob.Read(chunk)
if err != nil && err != io.EOF {
return err
}
if err == io.EOF {
// Fits into one block
return b.putSingleBlockBlob(container, name, chunk[:n])
} else {
// Does not fit into one block. Upload block by block then commit the block list
blockList := []Block{}
// Put blocks
for blockNum := 0; ; blockNum++ {
id := base64.StdEncoding.EncodeToString([]byte(fmt.Sprintf("%011d", blockNum)))
data := chunk[:n]
err = b.PutBlock(container, name, id, data)
if err != nil {
return err
}
blockList = append(blockList, Block{id, BlockStatusLatest})
// Read next block
n, err = blob.Read(chunk)
if err != nil && err != io.EOF {
return err
}
if err == io.EOF {
break
}
}
// Commit block list
return b.PutBlockList(container, name, blockList)
}
}
func (b BlobStorageClient) putSingleBlockBlob(container, name string, chunk []byte) error {
if len(chunk) > MaxBlobBlockSize {
return fmt.Errorf("storage: provided chunk (%d bytes) cannot fit into single-block blob (max %d bytes)", len(chunk), MaxBlobBlockSize)
}
uri := b.client.getEndpoint(blobServiceName, pathForBlob(container, name), url.Values{})
headers := b.client.getStandardHeaders()
headers["x-ms-blob-type"] = string(BlobTypeBlock)
headers["Content-Length"] = fmt.Sprintf("%v", len(chunk))
resp, err := b.client.exec("PUT", uri, headers, bytes.NewReader(chunk))
if err != nil {
return err
}
if resp.statusCode != http.StatusCreated {
return ErrNotCreated
}
return nil
}
// PutBlock saves the given data chunk to the specified block blob with
// given ID. See https://msdn.microsoft.com/en-us/library/azure/dd135726.aspx
func (b BlobStorageClient) PutBlock(container, name, blockId string, chunk []byte) error {
return b.PutBlockWithLength(container, name, blockId, uint64(len(chunk)), bytes.NewReader(chunk))
}
// PutBlockWithLength saves the given data stream of exactly specified size to the block blob
// with given ID. See https://msdn.microsoft.com/en-us/library/azure/dd135726.aspx
// It is an alternative to PutBlocks where data comes as stream but the length is
// known in advance.
func (b BlobStorageClient) PutBlockWithLength(container, name, blockId string, size uint64, blob io.Reader) error {
uri := b.client.getEndpoint(blobServiceName, pathForBlob(container, name), url.Values{"comp": {"block"}, "blockid": {blockId}})
headers := b.client.getStandardHeaders()
headers["x-ms-blob-type"] = string(BlobTypeBlock)
headers["Content-Length"] = fmt.Sprintf("%v", size)
resp, err := b.client.exec("PUT", uri, headers, blob)
if err != nil {
return err
}
if resp.statusCode != http.StatusCreated {
return ErrNotCreated
}
return nil
}
// PutBlockList saves list of blocks to the specified block blob. See
// https://msdn.microsoft.com/en-us/library/azure/dd179467.aspx
func (b BlobStorageClient) PutBlockList(container, name string, blocks []Block) error {
blockListXml := prepareBlockListRequest(blocks)
uri := b.client.getEndpoint(blobServiceName, pathForBlob(container, name), url.Values{"comp": {"blocklist"}})
headers := b.client.getStandardHeaders()
headers["Content-Length"] = fmt.Sprintf("%v", len(blockListXml))
resp, err := b.client.exec("PUT", uri, headers, strings.NewReader(blockListXml))
if err != nil {
return err
}
if resp.statusCode != http.StatusCreated {
return ErrNotCreated
}
return nil
}
// GetBlockList retrieves list of blocks in the specified block blob. See
// https://msdn.microsoft.com/en-us/library/azure/dd179400.aspx
func (b BlobStorageClient) GetBlockList(container, name string, blockType BlockListType) (BlockListResponse, error) {
params := url.Values{"comp": {"blocklist"}, "blocklisttype": {string(blockType)}}
uri := b.client.getEndpoint(blobServiceName, pathForBlob(container, name), params)
headers := b.client.getStandardHeaders()
var out BlockListResponse
resp, err := b.client.exec("GET", uri, headers, nil)
if err != nil {
return out, err
}
err = xmlUnmarshal(resp.body, &out)
return out, err
}
// PutPageBlob initializes an empty page blob with specified name and maximum
// size in bytes (size must be aligned to a 512-byte boundary). A page blob must
// be created using this method before writing pages.
// See https://msdn.microsoft.com/en-us/library/azure/dd179451.aspx
func (b BlobStorageClient) PutPageBlob(container, name string, size int64) error {
path := fmt.Sprintf("%s/%s", container, name)
uri := b.client.getEndpoint(blobServiceName, path, url.Values{})
headers := b.client.getStandardHeaders()
headers["x-ms-blob-type"] = string(BlobTypePage)
headers["x-ms-blob-content-length"] = fmt.Sprintf("%v", size)
headers["Content-Length"] = fmt.Sprintf("%v", 0)
resp, err := b.client.exec("PUT", uri, headers, nil)
if err != nil {
return err
}
if resp.statusCode != http.StatusCreated {
return ErrNotCreated
}
return nil
}
// PutPage writes a range of pages to a page blob or clears the given range.
// In case of 'clear' writes, given chunk is discarded. Ranges must be aligned
// with 512-byte boundaries and chunk must be of size multiplies by 512.
// See https://msdn.microsoft.com/en-us/library/ee691975.aspx
func (b BlobStorageClient) PutPage(container, name string, startByte, endByte int64, writeType PageWriteType, chunk []byte) error {
path := fmt.Sprintf("%s/%s", container, name)
uri := b.client.getEndpoint(blobServiceName, path, url.Values{"comp": {"page"}})
headers := b.client.getStandardHeaders()
headers["x-ms-blob-type"] = string(BlobTypePage)
headers["x-ms-page-write"] = string(writeType)
headers["x-ms-range"] = fmt.Sprintf("bytes=%v-%v", startByte, endByte)
var contentLength int64
var data io.Reader
if writeType == PageWriteTypeClear {
contentLength = 0
data = bytes.NewReader([]byte{})
} else {
contentLength = int64(len(chunk))
data = bytes.NewReader(chunk)
}
headers["Content-Length"] = fmt.Sprintf("%v", contentLength)
resp, err := b.client.exec("PUT", uri, headers, data)
if err != nil {
return err
}
if resp.statusCode != http.StatusCreated {
return ErrNotCreated
}
return nil
}
// GetPageRanges returns the list of valid page ranges for a page blob.
// See https://msdn.microsoft.com/en-us/library/azure/ee691973.aspx
func (b BlobStorageClient) GetPageRanges(container, name string) (GetPageRangesResponse, error) {
path := fmt.Sprintf("%s/%s", container, name)
uri := b.client.getEndpoint(blobServiceName, path, url.Values{"comp": {"pagelist"}})
headers := b.client.getStandardHeaders()
var out GetPageRangesResponse
resp, err := b.client.exec("GET", uri, headers, nil)
if err != nil {
return out, err
}
if resp.statusCode != http.StatusOK {
return out, fmt.Errorf(errUnexpectedStatus, http.StatusOK, resp.statusCode)
}
err = xmlUnmarshal(resp.body, &out)
return out, err
}
// CopyBlob starts a blob copy operation and waits for the operation to complete.
// sourceBlob parameter must be a canonical URL to the blob (can be obtained using
// GetBlobURL method.) There is no SLA on blob copy and therefore this helper
// method works faster on smaller files. See https://msdn.microsoft.com/en-us/library/azure/dd894037.aspx
func (b BlobStorageClient) CopyBlob(container, name, sourceBlob string) error {
copyId, err := b.startBlobCopy(container, name, sourceBlob)
if err != nil {
return err
}
return b.waitForBlobCopy(container, name, copyId)
}
func (b BlobStorageClient) startBlobCopy(container, name, sourceBlob string) (string, error) {
uri := b.client.getEndpoint(blobServiceName, pathForBlob(container, name), url.Values{})
headers := b.client.getStandardHeaders()
headers["Content-Length"] = "0"
headers["x-ms-copy-source"] = sourceBlob
resp, err := b.client.exec("PUT", uri, headers, nil)
if err != nil {
return "", err
}
if resp.statusCode != http.StatusAccepted && resp.statusCode != http.StatusCreated {
return "", fmt.Errorf(errUnexpectedStatus, []int{http.StatusAccepted, http.StatusCreated}, resp.statusCode)
}
copyId := resp.headers.Get("x-ms-copy-id")
if copyId == "" {
return "", errors.New("Got empty copy id header")
}
return copyId, nil
}
func (b BlobStorageClient) waitForBlobCopy(container, name, copyId string) error {
for {
props, err := b.GetBlobProperties(container, name)
if err != nil {
return err
}
if props.CopyId != copyId {
return errBlobCopyIdMismatch
}
switch props.CopyStatus {
case blobCopyStatusSuccess:
return nil
case blobCopyStatusPending:
continue
case blobCopyStatusAborted:
return errBlobCopyAborted
case blobCopyStatusFailed:
return fmt.Errorf("storage: blob copy failed. Id=%s Description=%s", props.CopyId, props.CopyStatusDescription)
default:
return fmt.Errorf("storage: unhandled blob copy status: '%s'", props.CopyStatus)
}
}
}
// DeleteBlob deletes the given blob from the specified container.
// If the blob does not exists at the time of the Delete Blob operation, it
// returns error. See https://msdn.microsoft.com/en-us/library/azure/dd179413.aspx
func (b BlobStorageClient) DeleteBlob(container, name string) error {
resp, err := b.deleteBlob(container, name)
if err != nil {
return err
}
if resp.statusCode != http.StatusAccepted {
return ErrNotAccepted
}
return nil
}
// DeleteBlobIfExists deletes the given blob from the specified container
// If the blob is deleted with this call, returns true. Otherwise returns
// false. See https://msdn.microsoft.com/en-us/library/azure/dd179413.aspx
func (b BlobStorageClient) DeleteBlobIfExists(container, name string) (bool, error) {
resp, err := b.deleteBlob(container, name)
if resp != nil && (resp.statusCode == http.StatusAccepted || resp.statusCode == http.StatusNotFound) {
return resp.statusCode == http.StatusAccepted, nil
}
return false, err
}
func (b BlobStorageClient) deleteBlob(container, name string) (*storageResponse, error) {
verb := "DELETE"
uri := b.client.getEndpoint(blobServiceName, pathForBlob(container, name), url.Values{})
headers := b.client.getStandardHeaders()
return b.client.exec(verb, uri, headers, nil)
}
// helper method to construct the path to a container given its name
func pathForContainer(name string) string {
return fmt.Sprintf("/%s", name)
}
// helper method to construct the path to a blob given its container and blob name
func pathForBlob(container, name string) string {
return fmt.Sprintf("/%s/%s", container, name)
}
// GetBlobSASURI creates an URL to the specified blob which contains the Shared Access Signature
// with specified permissions and expiration time. See https://msdn.microsoft.com/en-us/library/azure/ee395415.aspx
func (b BlobStorageClient) GetBlobSASURI(container, name string, expiry time.Time, permissions string) (string, error) {
var (
signedPermissions = permissions
blobUrl = b.GetBlobUrl(container, name)
)
canonicalizedResource, err := b.client.buildCanonicalizedResource(blobUrl)
if err != nil {
return "", err
}
signedExpiry := expiry.Format(time.RFC3339)
signedResource := "b"
stringToSign, err := blobSASStringToSign(b.client.apiVersion, canonicalizedResource, signedExpiry, signedPermissions)
if err != nil {
return "", err
}
sig := b.client.computeHmac256(stringToSign)
sasParams := url.Values{
"sv": {b.client.apiVersion},
"se": {signedExpiry},
"sr": {signedResource},
"sp": {signedPermissions},
"sig": {sig},
}
sasUrl, err := url.Parse(blobUrl)
if err != nil {
return "", err
}
sasUrl.RawQuery = sasParams.Encode()
return sasUrl.String(), nil
}
func blobSASStringToSign(signedVersion, canonicalizedResource, signedExpiry, signedPermissions string) (string, error) {
var signedStart, signedIdentifier, rscc, rscd, rsce, rscl, rsct string
// reference: http://msdn.microsoft.com/en-us/library/azure/dn140255.aspx
if signedVersion >= "2013-08-15" {
return fmt.Sprintf("%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s", signedPermissions, signedStart, signedExpiry, canonicalizedResource, signedIdentifier, signedVersion, rscc, rscd, rsce, rscl, rsct), nil
} else {
return "", errors.New("storage: not implemented SAS for versions earlier than 2013-08-15")
}
}

1123
Godeps/_workspace/src/github.com/MSOpenTech/azure-sdk-for-go/clients/storage/blob_test.go generated vendored Normal file
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315
Godeps/_workspace/src/github.com/MSOpenTech/azure-sdk-for-go/clients/storage/client.go generated vendored Normal file
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@ -0,0 +1,315 @@
package storage
import (
"bytes"
"encoding/base64"
"encoding/xml"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"regexp"
"sort"
"strings"
)
const (
DefaultBaseUrl = "core.windows.net"
DefaultApiVersion = "2014-02-14"
defaultUseHttps = true
blobServiceName = "blob"
tableServiceName = "table"
queueServiceName = "queue"
)
// StorageClient is the object that needs to be constructed
// to perform operations on the storage account.
type StorageClient struct {
accountName string
accountKey []byte
useHttps bool
baseUrl string
apiVersion string
}
type storageResponse struct {
statusCode int
headers http.Header
body io.ReadCloser
}
// StorageServiceError contains fields of the error response from
// Azure Storage Service REST API. See https://msdn.microsoft.com/en-us/library/azure/dd179382.aspx
// Some fields might be specific to certain calls.
type StorageServiceError struct {
Code string `xml:"Code"`
Message string `xml:"Message"`
AuthenticationErrorDetail string `xml:"AuthenticationErrorDetail"`
QueryParameterName string `xml:"QueryParameterName"`
QueryParameterValue string `xml:"QueryParameterValue"`
Reason string `xml:"Reason"`
StatusCode int
RequestId string
}
// NewBasicClient constructs a StorageClient with given storage service name
// and key.
func NewBasicClient(accountName, accountKey string) (*StorageClient, error) {
return NewClient(accountName, accountKey, DefaultBaseUrl, DefaultApiVersion, defaultUseHttps)
}
// NewClient constructs a StorageClient. This should be used if the caller
// wants to specify whether to use HTTPS, a specific REST API version or a
// custom storage endpoint than Azure Public Cloud.
func NewClient(accountName, accountKey, blobServiceBaseUrl, apiVersion string, useHttps bool) (*StorageClient, error) {
if accountName == "" {
return nil, fmt.Errorf("azure: account name required")
} else if accountKey == "" {
return nil, fmt.Errorf("azure: account key required")
} else if blobServiceBaseUrl == "" {
return nil, fmt.Errorf("azure: base storage service url required")
}
key, err := base64.StdEncoding.DecodeString(accountKey)
if err != nil {
return nil, err
}
return &StorageClient{
accountName: accountName,
accountKey: key,
useHttps: useHttps,
baseUrl: blobServiceBaseUrl,
apiVersion: apiVersion}, nil
}
func (c StorageClient) getBaseUrl(service string) string {
scheme := "http"
if c.useHttps {
scheme = "https"
}
host := fmt.Sprintf("%s.%s.%s", c.accountName, service, c.baseUrl)
u := &url.URL{
Scheme: scheme,
Host: host}
return u.String()
}
func (c StorageClient) getEndpoint(service, path string, params url.Values) string {
u, err := url.Parse(c.getBaseUrl(service))
if err != nil {
// really should not be happening
panic(err)
}
if path == "" {
path = "/" // API doesn't accept path segments not starting with '/'
}
u.Path = path
u.RawQuery = params.Encode()
return u.String()
}
// GetBlobService returns a BlobStorageClient which can operate on the
// blob service of the storage account.
func (c StorageClient) GetBlobService() *BlobStorageClient {
return &BlobStorageClient{c}
}
func (c StorageClient) createAuthorizationHeader(canonicalizedString string) string {
signature := c.computeHmac256(canonicalizedString)
return fmt.Sprintf("%s %s:%s", "SharedKey", c.accountName, signature)
}
func (c StorageClient) getAuthorizationHeader(verb, url string, headers map[string]string) (string, error) {
canonicalizedResource, err := c.buildCanonicalizedResource(url)
if err != nil {
return "", err
}
canonicalizedString := c.buildCanonicalizedString(verb, headers, canonicalizedResource)
return c.createAuthorizationHeader(canonicalizedString), nil
}
func (c StorageClient) getStandardHeaders() map[string]string {
return map[string]string{
"x-ms-version": c.apiVersion,
"x-ms-date": currentTimeRfc1123Formatted(),
}
}
func (c StorageClient) buildCanonicalizedHeader(headers map[string]string) string {
cm := make(map[string]string)
for k, v := range headers {
headerName := strings.TrimSpace(strings.ToLower(k))
match, _ := regexp.MatchString("x-ms-", headerName)
if match {
cm[headerName] = v
}
}
if len(cm) == 0 {
return ""
}
keys := make([]string, 0, len(cm))
for key := range cm {
keys = append(keys, key)
}
sort.Strings(keys)
ch := ""
for i, key := range keys {
if i == len(keys)-1 {
ch += fmt.Sprintf("%s:%s", key, cm[key])
} else {
ch += fmt.Sprintf("%s:%s\n", key, cm[key])
}
}
return ch
}
func (c StorageClient) buildCanonicalizedResource(uri string) (string, error) {
errMsg := "buildCanonicalizedResource error: %s"
u, err := url.Parse(uri)
if err != nil {
return "", fmt.Errorf(errMsg, err.Error())
}
cr := "/" + c.accountName
if len(u.Path) > 0 {
cr += u.Path
}
params, err := url.ParseQuery(u.RawQuery)
if err != nil {
return "", fmt.Errorf(errMsg, err.Error())
}
if len(params) > 0 {
cr += "\n"
keys := make([]string, 0, len(params))
for key := range params {
keys = append(keys, key)
}
sort.Strings(keys)
for i, key := range keys {
if len(params[key]) > 1 {
sort.Strings(params[key])
}
if i == len(keys)-1 {
cr += fmt.Sprintf("%s:%s", key, strings.Join(params[key], ","))
} else {
cr += fmt.Sprintf("%s:%s\n", key, strings.Join(params[key], ","))
}
}
}
return cr, nil
}
func (c StorageClient) buildCanonicalizedString(verb string, headers map[string]string, canonicalizedResource string) string {
canonicalizedString := fmt.Sprintf("%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s",
verb,
headers["Content-Encoding"],
headers["Content-Language"],
headers["Content-Length"],
headers["Content-MD5"],
headers["Content-Type"],
headers["Date"],
headers["If-Modified-Singe"],
headers["If-Match"],
headers["If-None-Match"],
headers["If-Unmodified-Singe"],
headers["Range"],
c.buildCanonicalizedHeader(headers),
canonicalizedResource)
return canonicalizedString
}
func (c StorageClient) exec(verb, url string, headers map[string]string, body io.Reader) (*storageResponse, error) {
authHeader, err := c.getAuthorizationHeader(verb, url, headers)
if err != nil {
return nil, err
}
headers["Authorization"] = authHeader
if err != nil {
return nil, err
}
req, err := http.NewRequest(verb, url, body)
for k, v := range headers {
req.Header.Add(k, v)
}
httpClient := http.Client{}
resp, err := httpClient.Do(req)
if err != nil {
return nil, err
}
statusCode := resp.StatusCode
if statusCode >= 400 && statusCode <= 505 {
var respBody []byte
respBody, err = readResponseBody(resp)
if err != nil {
return nil, err
}
if len(respBody) == 0 {
// no error in response body
err = fmt.Errorf("storage: service returned without a response body (%s).", resp.Status)
} else {
// response contains storage service error object, unmarshal
storageErr, errIn := serviceErrFromXml(respBody, resp.StatusCode, resp.Header.Get("x-ms-request-id"))
if err != nil { // error unmarshaling the error response
err = errIn
}
err = storageErr
}
return &storageResponse{
statusCode: resp.StatusCode,
headers: resp.Header,
body: ioutil.NopCloser(bytes.NewReader(respBody)), /* restore the body */
}, err
}
return &storageResponse{
statusCode: resp.StatusCode,
headers: resp.Header,
body: resp.Body}, nil
}
func readResponseBody(resp *http.Response) ([]byte, error) {
defer resp.Body.Close()
out, err := ioutil.ReadAll(resp.Body)
if err == io.EOF {
err = nil
}
return out, err
}
func serviceErrFromXml(body []byte, statusCode int, requestId string) (StorageServiceError, error) {
var storageErr StorageServiceError
if err := xml.Unmarshal(body, &storageErr); err != nil {
return storageErr, err
}
storageErr.StatusCode = statusCode
storageErr.RequestId = requestId
return storageErr, nil
}
func (e StorageServiceError) Error() string {
return fmt.Sprintf("storage: remote server returned error. StatusCode=%d, ErrorCode=%s, ErrorMessage=%s, RequestId=%s", e.StatusCode, e.Code, e.Message, e.RequestId)
}

203
Godeps/_workspace/src/github.com/MSOpenTech/azure-sdk-for-go/clients/storage/client_test.go generated vendored Normal file
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@ -0,0 +1,203 @@
package storage
import (
"encoding/base64"
"net/url"
"testing"
)
func TestGetBaseUrl_Basic_Https(t *testing.T) {
cli, err := NewBasicClient("foo", "YmFy")
if err != nil {
t.Fatal(err)
}
if cli.apiVersion != DefaultApiVersion {
t.Fatalf("Wrong api version. Expected: '%s', got: '%s'", DefaultApiVersion, cli.apiVersion)
}
if err != nil {
t.Fatal(err)
}
output := cli.getBaseUrl("table")
if expected := "https://foo.table.core.windows.net"; output != expected {
t.Fatalf("Wrong base url. Expected: '%s', got: '%s'", expected, output)
}
}
func TestGetBaseUrl_Custom_NoHttps(t *testing.T) {
apiVersion := DefaultApiVersion
cli, err := NewClient("foo", "YmFy", "core.chinacloudapi.cn", apiVersion, false)
if err != nil {
t.Fatal(err)
}
if cli.apiVersion != apiVersion {
t.Fatalf("Wrong api version. Expected: '%s', got: '%s'", apiVersion, cli.apiVersion)
}
output := cli.getBaseUrl("table")
if expected := "http://foo.table.core.chinacloudapi.cn"; output != expected {
t.Fatalf("Wrong base url. Expected: '%s', got: '%s'", expected, output)
}
}
func TestGetEndpoint_None(t *testing.T) {
cli, err := NewBasicClient("foo", "YmFy")
if err != nil {
t.Fatal(err)
}
output := cli.getEndpoint(blobServiceName, "", url.Values{})
if expected := "https://foo.blob.core.windows.net/"; output != expected {
t.Fatalf("Wrong endpoint url. Expected: '%s', got: '%s'", expected, output)
}
}
func TestGetEndpoint_PathOnly(t *testing.T) {
cli, err := NewBasicClient("foo", "YmFy")
if err != nil {
t.Fatal(err)
}
output := cli.getEndpoint(blobServiceName, "path", url.Values{})
if expected := "https://foo.blob.core.windows.net/path"; output != expected {
t.Fatalf("Wrong endpoint url. Expected: '%s', got: '%s'", expected, output)
}
}
func TestGetEndpoint_ParamsOnly(t *testing.T) {
cli, err := NewBasicClient("foo", "YmFy")
if err != nil {
t.Fatal(err)
}
params := url.Values{}
params.Set("a", "b")
params.Set("c", "d")
output := cli.getEndpoint(blobServiceName, "", params)
if expected := "https://foo.blob.core.windows.net/?a=b&c=d"; output != expected {
t.Fatalf("Wrong endpoint url. Expected: '%s', got: '%s'", expected, output)
}
}
func TestGetEndpoint_Mixed(t *testing.T) {
cli, err := NewBasicClient("foo", "YmFy")
if err != nil {
t.Fatal(err)
}
params := url.Values{}
params.Set("a", "b")
params.Set("c", "d")
output := cli.getEndpoint(blobServiceName, "path", params)
if expected := "https://foo.blob.core.windows.net/path?a=b&c=d"; output != expected {
t.Fatalf("Wrong endpoint url. Expected: '%s', got: '%s'", expected, output)
}
}
func Test_getStandardHeaders(t *testing.T) {
cli, err := NewBasicClient("foo", "YmFy")
if err != nil {
t.Fatal(err)
}
headers := cli.getStandardHeaders()
if len(headers) != 2 {
t.Fatal("Wrong standard header count")
}
if v, ok := headers["x-ms-version"]; !ok || v != cli.apiVersion {
t.Fatal("Wrong version header")
}
if _, ok := headers["x-ms-date"]; !ok {
t.Fatal("Missing date header")
}
}
func Test_buildCanonicalizedResource(t *testing.T) {
cli, err := NewBasicClient("foo", "YmFy")
if err != nil {
t.Fatal(err)
}
type test struct{ url, expected string }
tests := []test{
{"https://foo.blob.core.windows.net/path?a=b&c=d", "/foo/path\na:b\nc:d"},
{"https://foo.blob.core.windows.net/?comp=list", "/foo/\ncomp:list"},
{"https://foo.blob.core.windows.net/cnt/blob", "/foo/cnt/blob"},
}
for _, i := range tests {
if out, err := cli.buildCanonicalizedResource(i.url); err != nil {
t.Fatal(err)
} else if out != i.expected {
t.Fatalf("Wrong canonicalized resource. Expected:\n'%s', Got:\n'%s'", i.expected, out)
}
}
}
func Test_buildCanonicalizedHeader(t *testing.T) {
cli, err := NewBasicClient("foo", "YmFy")
if err != nil {
t.Fatal(err)
}
type test struct {
headers map[string]string
expected string
}
tests := []test{
{map[string]string{}, ""},
{map[string]string{"x-ms-foo": "bar"}, "x-ms-foo:bar"},
{map[string]string{"foo:": "bar"}, ""},
{map[string]string{"foo:": "bar", "x-ms-foo": "bar"}, "x-ms-foo:bar"},
{map[string]string{
"x-ms-version": "9999-99-99",
"x-ms-blob-type": "BlockBlob"}, "x-ms-blob-type:BlockBlob\nx-ms-version:9999-99-99"}}
for _, i := range tests {
if out := cli.buildCanonicalizedHeader(i.headers); out != i.expected {
t.Fatalf("Wrong canonicalized resource. Expected:\n'%s', Got:\n'%s'", i.expected, out)
}
}
}
func TestReturnsStorageServiceError(t *testing.T) {
cli, err := getBlobClient()
if err != nil {
t.Fatal(err)
}
// attempt to delete a nonexisting container
_, err = cli.deleteContainer(randContainer())
if err == nil {
t.Fatal("Service has not returned an error")
}
if v, ok := err.(StorageServiceError); !ok {
t.Fatal("Cannot assert to specific error")
} else if v.StatusCode != 404 {
t.Fatalf("Expected status:%d, got: %d", 404, v.StatusCode)
} else if v.Code != "ContainerNotFound" {
t.Fatalf("Expected code: %s, got: %s", "ContainerNotFound", v.Code)
} else if v.RequestId == "" {
t.Fatalf("RequestId does not exist")
}
}
func Test_createAuthorizationHeader(t *testing.T) {
key := base64.StdEncoding.EncodeToString([]byte("bar"))
cli, err := NewBasicClient("foo", key)
if err != nil {
t.Fatal(err)
}
canonicalizedString := `foobarzoo`
expected := `SharedKey foo:h5U0ATVX6SpbFX1H6GNuxIMeXXCILLoIvhflPtuQZ30=`
if out := cli.createAuthorizationHeader(canonicalizedString); out != expected {
t.Fatalf("Wrong authorization header. Expected: '%s', Got:'%s'", expected, out)
}
}

63
Godeps/_workspace/src/github.com/MSOpenTech/azure-sdk-for-go/clients/storage/util.go generated vendored Normal file
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@ -0,0 +1,63 @@
package storage
import (
"crypto/hmac"
"crypto/sha256"
"encoding/base64"
"encoding/xml"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"time"
)
func (c StorageClient) computeHmac256(message string) string {
h := hmac.New(sha256.New, c.accountKey)
h.Write([]byte(message))
return base64.StdEncoding.EncodeToString(h.Sum(nil))
}
func currentTimeRfc1123Formatted() string {
return timeRfc1123Formatted(time.Now().UTC())
}
func timeRfc1123Formatted(t time.Time) string {
return t.Format(http.TimeFormat)
}
func mergeParams(v1, v2 url.Values) url.Values {
out := url.Values{}
for k, v := range v1 {
out[k] = v
}
for k, v := range v2 {
vals, ok := out[k]
if ok {
vals = append(vals, v...)
out[k] = vals
} else {
out[k] = v
}
}
return out
}
func prepareBlockListRequest(blocks []Block) string {
s := `<?xml version="1.0" encoding="utf-8"?><BlockList>`
for _, v := range blocks {
s += fmt.Sprintf("<%s>%s</%s>", v.Status, v.Id, v.Status)
}
s += `</BlockList>`
return s
}
func xmlUnmarshal(body io.ReadCloser, v interface{}) error {
data, err := ioutil.ReadAll(body)
if err != nil {
return err
}
defer body.Close()
return xml.Unmarshal(data, v)
}

80
Godeps/_workspace/src/github.com/MSOpenTech/azure-sdk-for-go/clients/storage/util_test.go generated vendored Normal file
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@ -0,0 +1,80 @@
package storage
import (
"io/ioutil"
"net/url"
"reflect"
"strings"
"testing"
"time"
)
func Test_timeRfc1123Formatted(t *testing.T) {
now := time.Now().UTC()
expectedLayout := "Mon, 02 Jan 2006 15:04:05 GMT"
expected := now.Format(expectedLayout)
if output := timeRfc1123Formatted(now); output != expected {
t.Errorf("Expected: %s, got: %s", expected, output)
}
}
func Test_mergeParams(t *testing.T) {
v1 := url.Values{
"k1": {"v1"},
"k2": {"v2"}}
v2 := url.Values{
"k1": {"v11"},
"k3": {"v3"}}
out := mergeParams(v1, v2)
if v := out.Get("k1"); v != "v1" {
t.Errorf("Wrong value for k1: %s", v)
}
if v := out.Get("k2"); v != "v2" {
t.Errorf("Wrong value for k2: %s", v)
}
if v := out.Get("k3"); v != "v3" {
t.Errorf("Wrong value for k3: %s", v)
}
if v := out["k1"]; !reflect.DeepEqual(v, []string{"v1", "v11"}) {
t.Errorf("Wrong multi-value for k1: %s", v)
}
}
func Test_prepareBlockListRequest(t *testing.T) {
empty := []Block{}
expected := `<?xml version="1.0" encoding="utf-8"?><BlockList></BlockList>`
if out := prepareBlockListRequest(empty); expected != out {
t.Errorf("Wrong block list. Expected: '%s', got: '%s'", expected, out)
}
blocks := []Block{{"foo", BlockStatusLatest}, {"bar", BlockStatusUncommitted}}
expected = `<?xml version="1.0" encoding="utf-8"?><BlockList><Latest>foo</Latest><Uncommitted>bar</Uncommitted></BlockList>`
if out := prepareBlockListRequest(blocks); expected != out {
t.Errorf("Wrong block list. Expected: '%s', got: '%s'", expected, out)
}
}
func Test_xmlUnmarshal(t *testing.T) {
xml := `<?xml version="1.0" encoding="utf-8"?>
<Blob>
<Name>myblob</Name>
</Blob>`
body := ioutil.NopCloser(strings.NewReader(xml))
var blob Blob
err := xmlUnmarshal(body, &blob)
if err != nil {
t.Fatal(err)
}
if blob.Name != "myblob" {
t.Fatal("Got wrong value")
}
}

2
cmd/registry-storagedriver-azure/main.go
View File

@ -14,7 +14,7 @@ import (
// An out-of-process Azure Storage driver, intended to be run by ipc.NewDriverClient
func main() {
parametersBytes := []byte(os.Args[1])
var parameters map[string]string
var parameters map[string]interface{}
err := json.Unmarshal(parametersBytes, &parameters)
if err != nil {
panic(err)

217
storagedriver/azure/azure.go
View File

@ -1,19 +1,18 @@
// +build ignore
// Package azure provides a storagedriver.StorageDriver implementation to
// store blobs in Microsoft Azure Blob Storage Service.
package azure
import (
"bytes"
"encoding/base64"
"fmt"
"io"
"io/ioutil"
"strconv"
"net/http"
"strings"
"time"
"github.com/docker/distribution/storagedriver"
"github.com/docker/distribution/storagedriver/base"
"github.com/docker/distribution/storagedriver/factory"
azure "github.com/MSOpenTech/azure-sdk-for-go/clients/storage"
@ -27,41 +26,45 @@ const (
paramContainer = "container"
)
// Driver is a storagedriver.StorageDriver implementation backed by
// Microsoft Azure Blob Storage Service.
type Driver struct {
client *azure.BlobStorageClient
type driver struct {
client azure.BlobStorageClient
container string
}
type baseEmbed struct{ base.Base }
// Driver is a storagedriver.StorageDriver implementation backed by
// Microsoft Azure Blob Storage Service.
type Driver struct{ baseEmbed }
func init() {
factory.Register(driverName, &azureDriverFactory{})
}
type azureDriverFactory struct{}
func (factory *azureDriverFactory) Create(parameters map[string]string) (storagedriver.StorageDriver, error) {
func (factory *azureDriverFactory) Create(parameters map[string]interface{}) (storagedriver.StorageDriver, error) {
return FromParameters(parameters)
}
// FromParameters constructs a new Driver with a given parameters map.
func FromParameters(parameters map[string]string) (*Driver, error) {
func FromParameters(parameters map[string]interface{}) (*Driver, error) {
accountName, ok := parameters[paramAccountName]
if !ok {
if !ok || fmt.Sprint(accountName) == "" {
return nil, fmt.Errorf("No %s parameter provided", paramAccountName)
}
accountKey, ok := parameters[paramAccountKey]
if !ok {
if !ok || fmt.Sprint(accountKey) == "" {
return nil, fmt.Errorf("No %s parameter provided", paramAccountKey)
}
container, ok := parameters[paramContainer]
if !ok {
if !ok || fmt.Sprint(container) == "" {
return nil, fmt.Errorf("No %s parameter provided", paramContainer)
}
return New(accountName, accountKey, container)
return New(fmt.Sprint(accountName), fmt.Sprint(accountKey), fmt.Sprint(container))
}
// New constructs a new Driver with the given Azure Storage Account credentials
@ -78,15 +81,16 @@ func New(accountName, accountKey, container string) (*Driver, error) {
return nil, err
}
return &Driver{
client: blobClient,
container: container}, nil
d := &driver{
client: *blobClient,
container: container}
return &Driver{baseEmbed: baseEmbed{Base: base.Base{StorageDriver: d}}}, nil
}
// Implement the storagedriver.StorageDriver interface.
// GetContent retrieves the content stored at "path" as a []byte.
func (d *Driver) GetContent(path string) ([]byte, error) {
func (d *driver) GetContent(path string) ([]byte, error) {
blob, err := d.client.GetBlob(d.container, path)
if err != nil {
if is404(err) {
@ -99,26 +103,27 @@ func (d *Driver) GetContent(path string) ([]byte, error) {
}
// PutContent stores the []byte content at a location designated by "path".
func (d *Driver) PutContent(path string, contents []byte) error {
func (d *driver) PutContent(path string, contents []byte) error {
return d.client.PutBlockBlob(d.container, path, ioutil.NopCloser(bytes.NewReader(contents)))
}
// ReadStream retrieves an io.ReadCloser for the content stored at "path" with a
// given byte offset.
func (d *Driver) ReadStream(path string, offset int64) (io.ReadCloser, error) {
func (d *driver) ReadStream(path string, offset int64) (io.ReadCloser, error) {
if ok, err := d.client.BlobExists(d.container, path); err != nil {
return nil, err
} else if !ok {
return nil, storagedriver.PathNotFoundError{Path: path}
}
size, err := d.CurrentSize(path)
info, err := d.client.GetBlobProperties(d.container, path)
if err != nil {
return nil, err
}
if offset >= int64(size) {
return nil, storagedriver.InvalidOffsetError{Path: path, Offset: offset}
size := int64(info.ContentLength)
if offset >= size {
return ioutil.NopCloser(bytes.NewReader(nil)), nil
}
bytesRange := fmt.Sprintf("%v-", offset)
@ -131,91 +136,77 @@ func (d *Driver) ReadStream(path string, offset int64) (io.ReadCloser, error) {
// WriteStream stores the contents of the provided io.ReadCloser at a location
// designated by the given path.
func (d *Driver) WriteStream(path string, offset, size int64, reader io.ReadCloser) error {
var (
lastBlockNum int
resumableOffset int64
blocks []azure.Block
)
func (d *driver) WriteStream(path string, offset int64, reader io.Reader) (int64, error) {
if blobExists, err := d.client.BlobExists(d.container, path); err != nil {
return err
} else if !blobExists { // new blob
lastBlockNum = 0
resumableOffset = 0
} else { // append
if parts, err := d.client.GetBlockList(d.container, path, azure.BlockListTypeCommitted); err != nil {
return err
} else if len(parts.CommittedBlocks) == 0 {
lastBlockNum = 0
resumableOffset = 0
} else {
lastBlock := parts.CommittedBlocks[len(parts.CommittedBlocks)-1]
if lastBlockNum, err = blockNum(lastBlock.Name); err != nil {
return fmt.Errorf("Cannot parse block name as number '%s': %s", lastBlock.Name, err.Error())
}
var totalSize int64
for _, v := range parts.CommittedBlocks {
blocks = append(blocks, azure.Block{
Id: v.Name,
Status: azure.BlockStatusCommitted})
totalSize += int64(v.Size)
}
// NOTE: Azure driver currently supports only append mode (resumable
// index is exactly where the committed blocks of the blob end).
// In order to support writing to offsets other than last index,
// adjacent blocks overlapping with the [offset:offset+size] area
// must be fetched, splitted and should be overwritten accordingly.
// As the current use of this method is append only, that implementation
// is omitted.
resumableOffset = totalSize
return 0, err
} else if !blobExists {
err := d.client.CreateBlockBlob(d.container, path)
if err != nil {
return 0, err
}
}
if offset != resumableOffset {
return storagedriver.InvalidOffsetError{Path: path, Offset: offset}
if offset < 0 {
return 0, storagedriver.InvalidOffsetError{Path: path, Offset: offset}
}
// Put content
buf := make([]byte, azure.MaxBlobBlockSize)
for {
// Read chunks of exactly size N except the last chunk to
// maximize block size and minimize block count.
n, err := io.ReadFull(reader, buf)
if err == io.EOF {
break
}
data := buf[:n]
blockID := toBlockID(lastBlockNum + 1)
if err = d.client.PutBlock(d.container, path, blockID, data); err != nil {
return err
}
blocks = append(blocks, azure.Block{
Id: blockID,
Status: azure.BlockStatusLatest})
lastBlockNum++
}
// Commit block list
return d.client.PutBlockList(d.container, path, blocks)
bs := newAzureBlockStorage(d.client)
bw := newRandomBlobWriter(&bs, azure.MaxBlobBlockSize)
zw := newZeroFillWriter(&bw)
return zw.Write(d.container, path, offset, reader)
}
// CurrentSize retrieves the curernt size in bytes of the object at the given
// path.
func (d *Driver) CurrentSize(path string) (uint64, error) {
props, err := d.client.GetBlobProperties(d.container, path)
if err != nil {
return 0, err
// Stat retrieves the FileInfo for the given path, including the current size
// in bytes and the creation time.
func (d *driver) Stat(path string) (storagedriver.FileInfo, error) {
// Check if the path is a blob
if ok, err := d.client.BlobExists(d.container, path); err != nil {
return nil, err
} else if ok {
blob, err := d.client.GetBlobProperties(d.container, path)
if err != nil {
return nil, err
}
mtim, err := time.Parse(http.TimeFormat, blob.LastModified)
if err != nil {
return nil, err
}
return storagedriver.FileInfoInternal{FileInfoFields: storagedriver.FileInfoFields{
Path: path,
Size: int64(blob.ContentLength),
ModTime: mtim,
IsDir: false,
}}, nil
}
return props.ContentLength, nil
// Check if path is a virtual container
virtContainerPath := path
if !strings.HasSuffix(virtContainerPath, "/") {
virtContainerPath += "/"
}
blobs, err := d.client.ListBlobs(d.container, azure.ListBlobsParameters{
Prefix: virtContainerPath,
MaxResults: 1,
})
if err != nil {
return nil, err
}
if len(blobs.Blobs) > 0 {
// path is a virtual container
return storagedriver.FileInfoInternal{FileInfoFields: storagedriver.FileInfoFields{
Path: path,
IsDir: true,
}}, nil
}
// path is not a blob or virtual container
return nil, storagedriver.PathNotFoundError{Path: path}
}
// List returns a list of the objects that are direct descendants of the given
// path.
func (d *Driver) List(path string) ([]string, error) {
func (d *driver) List(path string) ([]string, error) {
if path == "/" {
path = ""
}
@ -231,7 +222,7 @@ func (d *Driver) List(path string) ([]string, error) {
// Move moves an object stored at sourcePath to destPath, removing the original
// object.
func (d *Driver) Move(sourcePath string, destPath string) error {
func (d *driver) Move(sourcePath string, destPath string) error {
sourceBlobURL := d.client.GetBlobUrl(d.container, sourcePath)
err := d.client.CopyBlob(d.container, destPath, sourceBlobURL)
if err != nil {
@ -245,7 +236,7 @@ func (d *Driver) Move(sourcePath string, destPath string) error {
}
// Delete recursively deletes all objects stored at "path" and its subpaths.
func (d *Driver) Delete(path string) error {
func (d *driver) Delete(path string) error {
ok, err := d.client.DeleteBlobIfExists(d.container, path)
if err != nil {
return err
@ -272,6 +263,21 @@ func (d *Driver) Delete(path string) error {
return nil
}
// URLFor returns a publicly accessible URL for the blob stored at given path
// for specified duration by making use of Azure Storage Shared Access Signatures (SAS).
// See https://msdn.microsoft.com/en-us/library/azure/ee395415.aspx for more info.
func (d *driver) URLFor(path string, options map[string]interface{}) (string, error) {
expiresTime := time.Now().UTC().Add(20 * time.Minute) // default expiration
expires, ok := options["expiry"]
if ok {
t, ok := expires.(time.Time)
if ok {
expiresTime = t
}
}
return d.client.GetBlobSASURI(d.container, path, expiresTime, "r")
}
// directDescendants will find direct descendants (blobs or virtual containers)
// of from list of blob paths and will return their full paths. Elements in blobs
// list must be prefixed with a "/" and
@ -306,7 +312,7 @@ func directDescendants(blobs []string, prefix string) []string {
return keys
}
func (d *Driver) listBlobs(container, virtPath string) ([]string, error) {
func (d *driver) listBlobs(container, virtPath string) ([]string, error) {
if virtPath != "" && !strings.HasSuffix(virtPath, "/") { // containerify the path
virtPath += "/"
}
@ -339,16 +345,3 @@ func is404(err error) bool {
e, ok := err.(azure.StorageServiceError)
return ok && e.StatusCode == 404
}
func blockNum(b64Name string) (int, error) {
s, err := base64.StdEncoding.DecodeString(b64Name)
if err != nil {
return 0, err
}
return strconv.Atoi(string(s))
}
func toBlockID(i int) string {
return base64.StdEncoding.EncodeToString([]byte(strconv.Itoa(i)))
}

12
storagedriver/azure/azure_test.go
View File

@ -1,5 +1,3 @@
// +build ignore
package azure
import (
@ -59,9 +57,9 @@ func init() {
}
testsuites.RegisterInProcessSuite(azureDriverConstructor, skipCheck)
testsuites.RegisterIPCSuite(driverName, map[string]string{
paramAccountName: accountName,
paramAccountKey: accountKey,
paramContainer: container,
}, skipCheck)
// testsuites.RegisterIPCSuite(driverName, map[string]string{
// paramAccountName: accountName,
// paramAccountKey: accountKey,
// paramContainer: container,
// }, skipCheck)
}

24
storagedriver/azure/blockblob.go Normal file
View File

@ -0,0 +1,24 @@
package azure
import (
"fmt"
"io"
azure "github.com/MSOpenTech/azure-sdk-for-go/clients/storage"
)
// azureBlockStorage is adaptor between azure.BlobStorageClient and
// blockStorage interface.
type azureBlockStorage struct {
azure.BlobStorageClient
}
func (b *azureBlockStorage) GetSectionReader(container, blob string, start, length int64) (io.ReadCloser, error) {
return b.BlobStorageClient.GetBlobRange(container, blob, fmt.Sprintf("%v-%v", start, start+length-1))
}
func newAzureBlockStorage(b azure.BlobStorageClient) azureBlockStorage {
a := azureBlockStorage{}
a.BlobStorageClient = b
return a
}

155
storagedriver/azure/blockblob_test.go Normal file
View File

@ -0,0 +1,155 @@
package azure
import (
"bytes"
"fmt"
"io"
"io/ioutil"
azure "github.com/MSOpenTech/azure-sdk-for-go/clients/storage"
)
type StorageSimulator struct {
blobs map[string]*BlockBlob
}
type BlockBlob struct {
blocks map[string]*DataBlock
blockList []string
}
type DataBlock struct {
data []byte
committed bool
}
func (s *StorageSimulator) path(container, blob string) string {
return fmt.Sprintf("%s/%s", container, blob)
}
func (s *StorageSimulator) BlobExists(container, blob string) (bool, error) {
_, ok := s.blobs[s.path(container, blob)]
return ok, nil
}
func (s *StorageSimulator) GetBlob(container, blob string) (io.ReadCloser, error) {
bb, ok := s.blobs[s.path(container, blob)]
if !ok {
return nil, fmt.Errorf("blob not found")
}
var readers []io.Reader
for _, bID := range bb.blockList {
readers = append(readers, bytes.NewReader(bb.blocks[bID].data))
}
return ioutil.NopCloser(io.MultiReader(readers...)), nil
}
func (s *StorageSimulator) GetSectionReader(container, blob string, start, length int64) (io.ReadCloser, error) {
r, err := s.GetBlob(container, blob)
if err != nil {
return nil, err
}
b, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
return ioutil.NopCloser(bytes.NewReader(b[start : start+length])), nil
}
func (s *StorageSimulator) CreateBlockBlob(container, blob string) error {
path := s.path(container, blob)
bb := &BlockBlob{
blocks: make(map[string]*DataBlock),
blockList: []string{},
}
s.blobs[path] = bb
return nil
}
func (s *StorageSimulator) PutBlock(container, blob, blockID string, chunk []byte) error {
path := s.path(container, blob)
bb, ok := s.blobs[path]
if !ok {
return fmt.Errorf("blob not found")
}
data := make([]byte, len(chunk))
copy(data, chunk)
bb.blocks[blockID] = &DataBlock{data: data, committed: false} // add block to blob
return nil
}
func (s *StorageSimulator) GetBlockList(container, blob string, blockType azure.BlockListType) (azure.BlockListResponse, error) {
resp := azure.BlockListResponse{}
bb, ok := s.blobs[s.path(container, blob)]
if !ok {
return resp, fmt.Errorf("blob not found")
}
// Iterate committed blocks (in order)
if blockType == azure.BlockListTypeAll || blockType == azure.BlockListTypeCommitted {
for _, blockID := range bb.blockList {
b := bb.blocks[blockID]
block := azure.BlockResponse{
Name: blockID,
Size: int64(len(b.data)),
}
resp.CommittedBlocks = append(resp.CommittedBlocks, block)
}
}
// Iterate uncommitted blocks (in no order)
if blockType == azure.BlockListTypeAll || blockType == azure.BlockListTypeCommitted {
for blockID, b := range bb.blocks {
block := azure.BlockResponse{
Name: blockID,
Size: int64(len(b.data)),
}
if !b.committed {
resp.UncommittedBlocks = append(resp.UncommittedBlocks, block)
}
}
}
return resp, nil
}
func (s *StorageSimulator) PutBlockList(container, blob string, blocks []azure.Block) error {
bb, ok := s.blobs[s.path(container, blob)]
if !ok {
return fmt.Errorf("blob not found")
}
var blockIDs []string
for _, v := range blocks {
bl, ok := bb.blocks[v.Id]
if !ok { // check if block ID exists
return fmt.Errorf("Block id '%s' not found", v.Id)
}
bl.committed = true
blockIDs = append(blockIDs, v.Id)
}
// Mark all other blocks uncommitted
for k, b := range bb.blocks {
inList := false
for _, v := range blockIDs {
if k == v {
inList = true
break
}
}
if !inList {
b.committed = false
}
}
bb.blockList = blockIDs
return nil
}
func NewStorageSimulator() StorageSimulator {
return StorageSimulator{
blobs: make(map[string]*BlockBlob),
}
}

60
storagedriver/azure/blockid.go Normal file
View File

@ -0,0 +1,60 @@
package azure
import (
"encoding/base64"
"fmt"
"math/rand"
"sync"
"time"
azure "github.com/MSOpenTech/azure-sdk-for-go/clients/storage"
)
type blockIDGenerator struct {
pool map[string]bool
r *rand.Rand
m sync.Mutex
}
// Generate returns an unused random block id and adds the generated ID
// to list of used IDs so that the same block name is not used again.
func (b *blockIDGenerator) Generate() string {
b.m.Lock()
defer b.m.Unlock()
var id string
for {
id = toBlockID(int(b.r.Int()))
if !b.exists(id) {
break
}
}
b.pool[id] = true
return id
}
func (b *blockIDGenerator) exists(id string) bool {
_, used := b.pool[id]
return used
}
func (b *blockIDGenerator) Feed(blocks azure.BlockListResponse) {
b.m.Lock()
defer b.m.Unlock()
for _, bl := range append(blocks.CommittedBlocks, blocks.UncommittedBlocks...) {
b.pool[bl.Name] = true
}
}
func newBlockIDGenerator() *blockIDGenerator {
return &blockIDGenerator{
pool: make(map[string]bool),
r: rand.New(rand.NewSource(time.Now().UnixNano()))}
}
// toBlockId converts given integer to base64-encoded block ID of a fixed length.
func toBlockID(i int) string {
s := fmt.Sprintf("%029d", i) // add zero padding for same length-blobs
return base64.StdEncoding.EncodeToString([]byte(s))
}

74
storagedriver/azure/blockid_test.go Normal file
View File

@ -0,0 +1,74 @@
package azure
import (
"math"
"testing"
azure "github.com/MSOpenTech/azure-sdk-for-go/clients/storage"
)
func Test_blockIdGenerator(t *testing.T) {
r := newBlockIDGenerator()
for i := 1; i <= 10; i++ {
if expected := i - 1; len(r.pool) != expected {
t.Fatalf("rand pool had wrong number of items: %d, expected:%d", len(r.pool), expected)
}
if id := r.Generate(); id == "" {
t.Fatal("returned empty id")
}
if expected := i; len(r.pool) != expected {
t.Fatalf("rand pool has wrong number of items: %d, expected:%d", len(r.pool), expected)
}
}
}
func Test_blockIdGenerator_Feed(t *testing.T) {
r := newBlockIDGenerator()
if expected := 0; len(r.pool) != expected {
t.Fatalf("rand pool had wrong number of items: %d, expected:%d", len(r.pool), expected)
}
// feed empty list
blocks := azure.BlockListResponse{}
r.Feed(blocks)
if expected := 0; len(r.pool) != expected {
t.Fatalf("rand pool had wrong number of items: %d, expected:%d", len(r.pool), expected)
}
// feed blocks
blocks = azure.BlockListResponse{
CommittedBlocks: []azure.BlockResponse{
{"1", 1},
{"2", 2},
},
UncommittedBlocks: []azure.BlockResponse{
{"3", 3},
}}
r.Feed(blocks)
if expected := 3; len(r.pool) != expected {
t.Fatalf("rand pool had wrong number of items: %d, expected:%d", len(r.pool), expected)
}
// feed same block IDs with committed/uncommitted place changed
blocks = azure.BlockListResponse{
CommittedBlocks: []azure.BlockResponse{
{"3", 3},
},
UncommittedBlocks: []azure.BlockResponse{
{"1", 1},
}}
r.Feed(blocks)
if expected := 3; len(r.pool) != expected {
t.Fatalf("rand pool had wrong number of items: %d, expected:%d", len(r.pool), expected)
}
}
func Test_toBlockId(t *testing.T) {
min := 0
max := math.MaxInt64
if len(toBlockID(min)) != len(toBlockID(max)) {
t.Fatalf("different-sized blockIDs are returned")
}
}

208
storagedriver/azure/randomwriter.go Normal file
View File

@ -0,0 +1,208 @@
package azure
import (
"fmt"
"io"
"io/ioutil"
azure "github.com/MSOpenTech/azure-sdk-for-go/clients/storage"
)
// blockStorage is the interface required from a block storage service
// client implementation
type blockStorage interface {
CreateBlockBlob(container, blob string) error
GetBlob(container, blob string) (io.ReadCloser, error)
GetSectionReader(container, blob string, start, length int64) (io.ReadCloser, error)
PutBlock(container, blob, blockID string, chunk []byte) error
GetBlockList(container, blob string, blockType azure.BlockListType) (azure.BlockListResponse, error)
PutBlockList(container, blob string, blocks []azure.Block) error
}
// randomBlobWriter enables random access semantics on Azure block blobs
// by enabling writing arbitrary length of chunks to arbitrary write offsets
// within the blob. Normally, Azure Blob Storage does not support random
// access semantics on block blobs; however, this writer can download, split and
// reupload the overlapping blocks and discards those being overwritten entirely.
type randomBlobWriter struct {
bs blockStorage
blockSize int
}
func newRandomBlobWriter(bs blockStorage, blockSize int) randomBlobWriter {
return randomBlobWriter{bs: bs, blockSize: blockSize}
}
// WriteBlobAt writes the given chunk to the specified position of an existing blob.
// The offset must be equals to size of the blob or smaller than it.
func (r *randomBlobWriter) WriteBlobAt(container, blob string, offset int64, chunk io.Reader) (int64, error) {
rand := newBlockIDGenerator()
blocks, err := r.bs.GetBlockList(container, blob, azure.BlockListTypeCommitted)
if err != nil {
return 0, err
}
rand.Feed(blocks) // load existing block IDs
// Check for write offset for existing blob
size := getBlobSize(blocks)
if offset < 0 || offset > size {
return 0, fmt.Errorf("wrong offset for Write: %v", offset)
}
// Upload the new chunk as blocks
blockList, nn, err := r.writeChunkToBlocks(container, blob, chunk, rand)
if err != nil {
return 0, err
}
// For non-append operations, existing blocks may need to be splitted
if offset != size {
// Split the block on the left end (if any)
leftBlocks, err := r.blocksLeftSide(container, blob, offset, rand)
if err != nil {
return 0, err
}
blockList = append(leftBlocks, blockList...)
// Split the block on the right end (if any)
rightBlocks, err := r.blocksRightSide(container, blob, offset, nn, rand)
if err != nil {
return 0, err
}
blockList = append(blockList, rightBlocks...)
} else {
// Use existing block list
var existingBlocks []azure.Block
for _, v := range blocks.CommittedBlocks {
existingBlocks = append(existingBlocks, azure.Block{Id: v.Name, Status: azure.BlockStatusCommitted})
}
blockList = append(existingBlocks, blockList...)
}
// Put block list
return nn, r.bs.PutBlockList(container, blob, blockList)
}
func (r *randomBlobWriter) GetSize(container, blob string) (int64, error) {
blocks, err := r.bs.GetBlockList(container, blob, azure.BlockListTypeCommitted)
if err != nil {
return 0, err
}
return getBlobSize(blocks), nil
}
// writeChunkToBlocks writes given chunk to one or multiple blocks within specified
// blob and returns their block representations. Those blocks are not committed, yet
func (r *randomBlobWriter) writeChunkToBlocks(container, blob string, chunk io.Reader, rand *blockIDGenerator) ([]azure.Block, int64, error) {
var newBlocks []azure.Block
var nn int64
// Read chunks of at most size N except the last chunk to
// maximize block size and minimize block count.
buf := make([]byte, r.blockSize)
for {
n, err := io.ReadFull(chunk, buf)
if err == io.EOF {
break
}
nn += int64(n)
data := buf[:n]
blockID := rand.Generate()
if err := r.bs.PutBlock(container, blob, blockID, data); err != nil {
return newBlocks, nn, err
}
newBlocks = append(newBlocks, azure.Block{Id: blockID, Status: azure.BlockStatusUncommitted})
}
return newBlocks, nn, nil
}
// blocksLeftSide returns the blocks that are going to be at the left side of
// the writeOffset: [0, writeOffset) by identifying blocks that will remain
// the same and splitting blocks and reuploading them as needed.
func (r *randomBlobWriter) blocksLeftSide(container, blob string, writeOffset int64, rand *blockIDGenerator) ([]azure.Block, error) {
var left []azure.Block
bx, err := r.bs.GetBlockList(container, blob, azure.BlockListTypeAll)
if err != nil {
return left, err
}
o := writeOffset
elapsed := int64(0)
for _, v := range bx.CommittedBlocks {
blkSize := int64(v.Size)
if o >= blkSize { // use existing block
left = append(left, azure.Block{Id: v.Name, Status: azure.BlockStatusCommitted})
o -= blkSize
elapsed += blkSize
} else if o > 0 { // current block needs to be splitted
start := elapsed
size := o
part, err := r.bs.GetSectionReader(container, blob, start, size)
if err != nil {
return left, err
}
newBlockID := rand.Generate()
data, err := ioutil.ReadAll(part)
if err != nil {
return left, err
}
if err = r.bs.PutBlock(container, blob, newBlockID, data); err != nil {
return left, err
}
left = append(left, azure.Block{Id: newBlockID, Status: azure.BlockStatusUncommitted})
break
}
}
return left, nil
}
// blocksRightSide returns the blocks that are going to be at the right side of
// the written chunk: [writeOffset+size, +inf) by identifying blocks that will remain
// the same and splitting blocks and reuploading them as needed.
func (r *randomBlobWriter) blocksRightSide(container, blob string, writeOffset int64, chunkSize int64, rand *blockIDGenerator) ([]azure.Block, error) {
var right []azure.Block
bx, err := r.bs.GetBlockList(container, blob, azure.BlockListTypeAll)
if err != nil {
return nil, err
}
re := writeOffset + chunkSize - 1 // right end of written chunk
var elapsed int64
for _, v := range bx.CommittedBlocks {
var (
bs = elapsed // left end of current block
be = elapsed + int64(v.Size) - 1 // right end of current block
)
if bs > re { // take the block as is
right = append(right, azure.Block{Id: v.Name, Status: azure.BlockStatusCommitted})
} else if be > re { // current block needs to be splitted
part, err := r.bs.GetSectionReader(container, blob, re+1, be-(re+1)+1)
if err != nil {
return right, err
}
newBlockID := rand.Generate()
data, err := ioutil.ReadAll(part)
if err != nil {
return right, err
}
if err = r.bs.PutBlock(container, blob, newBlockID, data); err != nil {
return right, err
}
right = append(right, azure.Block{Id: newBlockID, Status: azure.BlockStatusUncommitted})
}
elapsed += int64(v.Size)
}
return right, nil
}
func getBlobSize(blocks azure.BlockListResponse) int64 {
var n int64
for _, v := range blocks.CommittedBlocks {
n += int64(v.Size)
}
return n
}

339
storagedriver/azure/randomwriter_test.go Normal file
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package azure
import (
"bytes"
"io"
"io/ioutil"
"math/rand"
"reflect"
"strings"
"testing"
azure "github.com/MSOpenTech/azure-sdk-for-go/clients/storage"
)
func TestRandomWriter_writeChunkToBlocks(t *testing.T) {
s := NewStorageSimulator()
rw := newRandomBlobWriter(&s, 3)
rand := newBlockIDGenerator()
c := []byte("AAABBBCCCD")
if err := rw.bs.CreateBlockBlob("a", "b"); err != nil {
t.Fatal(err)
}
bw, nn, err := rw.writeChunkToBlocks("a", "b", bytes.NewReader(c), rand)
if err != nil {
t.Fatal(err)
}
if expected := int64(len(c)); nn != expected {
t.Fatalf("wrong nn:%v, expected:%v", nn, expected)
}
if expected := 4; len(bw) != expected {
t.Fatal("unexpected written block count")
}
bx, err := s.GetBlockList("a", "b", azure.BlockListTypeAll)
if err != nil {
t.Fatal(err)
}
if expected := 0; len(bx.CommittedBlocks) != expected {
t.Fatal("unexpected committed block count")
}
if expected := 4; len(bx.UncommittedBlocks) != expected {
t.Fatalf("unexpected uncommitted block count: %d -- %#v", len(bx.UncommittedBlocks), bx)
}
if err := rw.bs.PutBlockList("a", "b", bw); err != nil {
t.Fatal(err)
}
r, err := rw.bs.GetBlob("a", "b")
if err != nil {
t.Fatal(err)
}
assertBlobContents(t, r, c)
}
func TestRandomWriter_blocksLeftSide(t *testing.T) {
blob := "AAAAABBBBBCCC"
cases := []struct {
offset int64
expectedBlob string
expectedPattern []azure.BlockStatus
}{
{0, "", []azure.BlockStatus{}}, // write to beginning, discard all
{13, blob, []azure.BlockStatus{azure.BlockStatusCommitted, azure.BlockStatusCommitted, azure.BlockStatusCommitted}}, // write to end, no change
{1, "A", []azure.BlockStatus{azure.BlockStatusUncommitted}}, // write at 1
{5, "AAAAA", []azure.BlockStatus{azure.BlockStatusCommitted}}, // write just after first block
{6, "AAAAAB", []azure.BlockStatus{azure.BlockStatusCommitted, azure.BlockStatusUncommitted}}, // split the second block
{9, "AAAAABBBB", []azure.BlockStatus{azure.BlockStatusCommitted, azure.BlockStatusUncommitted}}, // write just after first block
}
for _, c := range cases {
s := NewStorageSimulator()
rw := newRandomBlobWriter(&s, 5)
rand := newBlockIDGenerator()
if err := rw.bs.CreateBlockBlob("a", "b"); err != nil {
t.Fatal(err)
}
bw, _, err := rw.writeChunkToBlocks("a", "b", strings.NewReader(blob), rand)
if err != nil {
t.Fatal(err)
}
if err := rw.bs.PutBlockList("a", "b", bw); err != nil {
t.Fatal(err)
}
bx, err := rw.blocksLeftSide("a", "b", c.offset, rand)
if err != nil {
t.Fatal(err)
}
bs := []azure.BlockStatus{}
for _, v := range bx {
bs = append(bs, v.Status)
}
if !reflect.DeepEqual(bs, c.expectedPattern) {
t.Logf("Committed blocks %v", bw)
t.Fatalf("For offset %v: Expected pattern: %v, Got: %v\n(Returned: %v)", c.offset, c.expectedPattern, bs, bx)
}
if rw.bs.PutBlockList("a", "b", bx); err != nil {
t.Fatal(err)
}
r, err := rw.bs.GetBlob("a", "b")
if err != nil {
t.Fatal(err)
}
cout, err := ioutil.ReadAll(r)
if err != nil {
t.Fatal(err)
}
outBlob := string(cout)
if outBlob != c.expectedBlob {
t.Fatalf("wrong blob contents: %v, expected: %v", outBlob, c.expectedBlob)
}
}
}
func TestRandomWriter_blocksRightSide(t *testing.T) {
blob := "AAAAABBBBBCCC"
cases := []struct {
offset int64
size int64
expectedBlob string
expectedPattern []azure.BlockStatus
}{
{0, 100, "", []azure.BlockStatus{}}, // overwrite the entire blob
{0, 3, "AABBBBBCCC", []azure.BlockStatus{azure.BlockStatusUncommitted, azure.BlockStatusCommitted, azure.BlockStatusCommitted}}, // split first block
{4, 1, "BBBBBCCC", []azure.BlockStatus{azure.BlockStatusCommitted, azure.BlockStatusCommitted}}, // write to last char of first block
{1, 6, "BBBCCC", []azure.BlockStatus{azure.BlockStatusUncommitted, azure.BlockStatusCommitted}}, // overwrite splits first and second block, last block remains
{3, 8, "CC", []azure.BlockStatus{azure.BlockStatusUncommitted}}, // overwrite a block in middle block, split end block
{10, 1, "CC", []azure.BlockStatus{azure.BlockStatusUncommitted}}, // overwrite first byte of rightmost block
{11, 2, "", []azure.BlockStatus{}}, // overwrite the rightmost index
{13, 20, "", []azure.BlockStatus{}}, // append to the end
}
for _, c := range cases {
s := NewStorageSimulator()
rw := newRandomBlobWriter(&s, 5)
rand := newBlockIDGenerator()
if err := rw.bs.CreateBlockBlob("a", "b"); err != nil {
t.Fatal(err)
}
bw, _, err := rw.writeChunkToBlocks("a", "b", strings.NewReader(blob), rand)
if err != nil {
t.Fatal(err)
}
if err := rw.bs.PutBlockList("a", "b", bw); err != nil {
t.Fatal(err)
}
bx, err := rw.blocksRightSide("a", "b", c.offset, c.size, rand)
if err != nil {
t.Fatal(err)
}
bs := []azure.BlockStatus{}
for _, v := range bx {
bs = append(bs, v.Status)
}
if !reflect.DeepEqual(bs, c.expectedPattern) {
t.Logf("Committed blocks %v", bw)
t.Fatalf("For offset %v-size:%v: Expected pattern: %v, Got: %v\n(Returned: %v)", c.offset, c.size, c.expectedPattern, bs, bx)
}
if rw.bs.PutBlockList("a", "b", bx); err != nil {
t.Fatal(err)
}
r, err := rw.bs.GetBlob("a", "b")
if err != nil {
t.Fatal(err)
}
cout, err := ioutil.ReadAll(r)
if err != nil {
t.Fatal(err)
}
outBlob := string(cout)
if outBlob != c.expectedBlob {
t.Fatalf("For offset %v-size:%v: wrong blob contents: %v, expected: %v", c.offset, c.size, outBlob, c.expectedBlob)
}
}
}
func TestRandomWriter_Write_NewBlob(t *testing.T) {
var (
s = NewStorageSimulator()
rw = newRandomBlobWriter(&s, 1024*3) // 3 KB blocks
blob = randomContents(1024 * 7) // 7 KB blob
)
if err := rw.bs.CreateBlockBlob("a", "b"); err != nil {
t.Fatal(err)
}
if _, err := rw.WriteBlobAt("a", "b", 10, bytes.NewReader(blob)); err == nil {
t.Fatal("expected error, got nil")
}
if _, err := rw.WriteBlobAt("a", "b", 100000, bytes.NewReader(blob)); err == nil {
t.Fatal("expected error, got nil")
}
if nn, err := rw.WriteBlobAt("a", "b", 0, bytes.NewReader(blob)); err != nil {
t.Fatal(err)
} else if expected := int64(len(blob)); expected != nn {
t.Fatalf("wrong written bytes count: %v, expected: %v", nn, expected)
}
if out, err := rw.bs.GetBlob("a", "b"); err != nil {
t.Fatal(err)
} else {
assertBlobContents(t, out, blob)
}
if bx, err := rw.bs.GetBlockList("a", "b", azure.BlockListTypeCommitted); err != nil {
t.Fatal(err)
} else if len(bx.CommittedBlocks) != 3 {
t.Fatalf("got wrong number of committed blocks: %v", len(bx.CommittedBlocks))
}
// Replace first 512 bytes
leftChunk := randomContents(512)
blob = append(leftChunk, blob[512:]...)
if nn, err := rw.WriteBlobAt("a", "b", 0, bytes.NewReader(leftChunk)); err != nil {
t.Fatal(err)
} else if expected := int64(len(leftChunk)); expected != nn {
t.Fatalf("wrong written bytes count: %v, expected: %v", nn, expected)
}
if out, err := rw.bs.GetBlob("a", "b"); err != nil {
t.Fatal(err)
} else {
assertBlobContents(t, out, blob)
}
if bx, err := rw.bs.GetBlockList("a", "b", azure.BlockListTypeCommitted); err != nil {
t.Fatal(err)
} else if expected := 4; len(bx.CommittedBlocks) != expected {
t.Fatalf("got wrong number of committed blocks: %v, expected: %v", len(bx.CommittedBlocks), expected)
}
// Replace last 512 bytes with 1024 bytes
rightChunk := randomContents(1024)
offset := int64(len(blob) - 512)
blob = append(blob[:offset], rightChunk...)
if nn, err := rw.WriteBlobAt("a", "b", offset, bytes.NewReader(rightChunk)); err != nil {
t.Fatal(err)
} else if expected := int64(len(rightChunk)); expected != nn {
t.Fatalf("wrong written bytes count: %v, expected: %v", nn, expected)
}
if out, err := rw.bs.GetBlob("a", "b"); err != nil {
t.Fatal(err)
} else {
assertBlobContents(t, out, blob)
}
if bx, err := rw.bs.GetBlockList("a", "b", azure.BlockListTypeCommitted); err != nil {
t.Fatal(err)
} else if expected := 5; len(bx.CommittedBlocks) != expected {
t.Fatalf("got wrong number of committed blocks: %v, expected: %v", len(bx.CommittedBlocks), expected)
}
// Replace 2K-4K (overlaps 2 blocks from L/R)
newChunk := randomContents(1024 * 2)
offset = 1024 * 2
blob = append(append(blob[:offset], newChunk...), blob[offset+int64(len(newChunk)):]...)
if nn, err := rw.WriteBlobAt("a", "b", offset, bytes.NewReader(newChunk)); err != nil {
t.Fatal(err)
} else if expected := int64(len(newChunk)); expected != nn {
t.Fatalf("wrong written bytes count: %v, expected: %v", nn, expected)
}
if out, err := rw.bs.GetBlob("a", "b"); err != nil {
t.Fatal(err)
} else {
assertBlobContents(t, out, blob)
}
if bx, err := rw.bs.GetBlockList("a", "b", azure.BlockListTypeCommitted); err != nil {
t.Fatal(err)
} else if expected := 6; len(bx.CommittedBlocks) != expected {
t.Fatalf("got wrong number of committed blocks: %v, expected: %v\n%v", len(bx.CommittedBlocks), expected, bx.CommittedBlocks)
}
// Replace the entire blob
newBlob := randomContents(1024 * 30)
if nn, err := rw.WriteBlobAt("a", "b", 0, bytes.NewReader(newBlob)); err != nil {
t.Fatal(err)
} else if expected := int64(len(newBlob)); expected != nn {
t.Fatalf("wrong written bytes count: %v, expected: %v", nn, expected)
}
if out, err := rw.bs.GetBlob("a", "b"); err != nil {
t.Fatal(err)
} else {
assertBlobContents(t, out, newBlob)
}
if bx, err := rw.bs.GetBlockList("a", "b", azure.BlockListTypeCommitted); err != nil {
t.Fatal(err)
} else if expected := 10; len(bx.CommittedBlocks) != expected {
t.Fatalf("got wrong number of committed blocks: %v, expected: %v\n%v", len(bx.CommittedBlocks), expected, bx.CommittedBlocks)
} else if expected, size := int64(1024*30), getBlobSize(bx); size != expected {
t.Fatalf("committed block size does not indicate blob size")
}
}
func Test_getBlobSize(t *testing.T) {
// with some committed blocks
if expected, size := int64(151), getBlobSize(azure.BlockListResponse{
CommittedBlocks: []azure.BlockResponse{
{"A", 100},
{"B", 50},
{"C", 1},
},
UncommittedBlocks: []azure.BlockResponse{
{"D", 200},
}}); expected != size {
t.Fatalf("wrong blob size: %v, expected: %v", size, expected)
}
// with no committed blocks
if expected, size := int64(0), getBlobSize(azure.BlockListResponse{
UncommittedBlocks: []azure.BlockResponse{
{"A", 100},
{"B", 50},
{"C", 1},
{"D", 200},
}}); expected != size {
t.Fatalf("wrong blob size: %v, expected: %v", size, expected)
}
}
func assertBlobContents(t *testing.T, r io.Reader, expected []byte) {
out, err := ioutil.ReadAll(r)
if err != nil {
t.Fatal(err)
}
if !reflect.DeepEqual(out, expected) {
t.Fatalf("wrong blob contents. size: %v, expected: %v", len(out), len(expected))
}
}
func randomContents(length int64) []byte {
b := make([]byte, length)
for i := range b {
b[i] = byte(rand.Intn(2 << 8))
}
return b
}

49
storagedriver/azure/zerofillwriter.go Normal file
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@ -0,0 +1,49 @@
package azure
import (
"bytes"
"io"
)
type blockBlobWriter interface {
GetSize(container, blob string) (int64, error)
WriteBlobAt(container, blob string, offset int64, chunk io.Reader) (int64, error)
}
// zeroFillWriter enables writing to an offset outside a block blob's size
// by offering the chunk to the underlying writer as a contiguous data with
// the gap in between filled with NUL (zero) bytes.
type zeroFillWriter struct {
blockBlobWriter
}
func newZeroFillWriter(b blockBlobWriter) zeroFillWriter {
w := zeroFillWriter{}
w.blockBlobWriter = b
return w
}
// Write writes the given chunk to the specified existing blob even though
// offset is out of blob's size. The gaps are filled with zeros. Returned
// written number count does not include zeros written.
func (z *zeroFillWriter) Write(container, blob string, offset int64, chunk io.Reader) (int64, error) {
size, err := z.blockBlobWriter.GetSize(container, blob)
if err != nil {
return 0, err
}
var reader io.Reader
var zeroPadding int64
if offset <= size {
reader = chunk
} else {
zeroPadding = offset - size
offset = size // adjust offset to be the append index
zeros := bytes.NewReader(make([]byte, zeroPadding))
reader = io.MultiReader(zeros, chunk)
}
nn, err := z.blockBlobWriter.WriteBlobAt(container, blob, offset, reader)
nn -= zeroPadding
return nn, err
}

126
storagedriver/azure/zerofillwriter_test.go Normal file
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@ -0,0 +1,126 @@
package azure
import (
"bytes"
"testing"
)
func Test_zeroFillWrite_AppendNoGap(t *testing.T) {
s := NewStorageSimulator()
bw := newRandomBlobWriter(&s, 1024*1)
zw := newZeroFillWriter(&bw)
if err := s.CreateBlockBlob("a", "b"); err != nil {
t.Fatal(err)
}
firstChunk := randomContents(1024*3 + 512)
if nn, err := zw.Write("a", "b", 0, bytes.NewReader(firstChunk)); err != nil {
t.Fatal(err)
} else if expected := int64(len(firstChunk)); expected != nn {
t.Fatalf("wrong written bytes count: %v, expected: %v", nn, expected)
}
if out, err := s.GetBlob("a", "b"); err != nil {
t.Fatal(err)
} else {
assertBlobContents(t, out, firstChunk)
}
secondChunk := randomContents(256)
if nn, err := zw.Write("a", "b", int64(len(firstChunk)), bytes.NewReader(secondChunk)); err != nil {
t.Fatal(err)
} else if expected := int64(len(secondChunk)); expected != nn {
t.Fatalf("wrong written bytes count: %v, expected: %v", nn, expected)
}
if out, err := s.GetBlob("a", "b"); err != nil {
t.Fatal(err)
} else {
assertBlobContents(t, out, append(firstChunk, secondChunk...))
}
}
func Test_zeroFillWrite_StartWithGap(t *testing.T) {
s := NewStorageSimulator()
bw := newRandomBlobWriter(&s, 1024*2)
zw := newZeroFillWriter(&bw)
if err := s.CreateBlockBlob("a", "b"); err != nil {
t.Fatal(err)
}
chunk := randomContents(1024 * 5)
padding := int64(1024*2 + 256)
if nn, err := zw.Write("a", "b", padding, bytes.NewReader(chunk)); err != nil {
t.Fatal(err)
} else if expected := int64(len(chunk)); expected != nn {
t.Fatalf("wrong written bytes count: %v, expected: %v", nn, expected)
}
if out, err := s.GetBlob("a", "b"); err != nil {
t.Fatal(err)
} else {
assertBlobContents(t, out, append(make([]byte, padding), chunk...))
}
}
func Test_zeroFillWrite_AppendWithGap(t *testing.T) {
s := NewStorageSimulator()
bw := newRandomBlobWriter(&s, 1024*2)
zw := newZeroFillWriter(&bw)
if err := s.CreateBlockBlob("a", "b"); err != nil {
t.Fatal(err)
}
firstChunk := randomContents(1024*3 + 512)
if _, err := zw.Write("a", "b", 0, bytes.NewReader(firstChunk)); err != nil {
t.Fatal(err)
}
if out, err := s.GetBlob("a", "b"); err != nil {
t.Fatal(err)
} else {
assertBlobContents(t, out, firstChunk)
}
secondChunk := randomContents(256)
padding := int64(1024 * 4)
if nn, err := zw.Write("a", "b", int64(len(firstChunk))+padding, bytes.NewReader(secondChunk)); err != nil {
t.Fatal(err)
} else if expected := int64(len(secondChunk)); expected != nn {
t.Fatalf("wrong written bytes count: %v, expected: %v", nn, expected)
}
if out, err := s.GetBlob("a", "b"); err != nil {
t.Fatal(err)
} else {
assertBlobContents(t, out, append(firstChunk, append(make([]byte, padding), secondChunk...)...))
}
}
func Test_zeroFillWrite_LiesWithinSize(t *testing.T) {
s := NewStorageSimulator()
bw := newRandomBlobWriter(&s, 1024*2)
zw := newZeroFillWriter(&bw)
if err := s.CreateBlockBlob("a", "b"); err != nil {
t.Fatal(err)
}
firstChunk := randomContents(1024 * 3)
if _, err := zw.Write("a", "b", 0, bytes.NewReader(firstChunk)); err != nil {
t.Fatal(err)
}
if out, err := s.GetBlob("a", "b"); err != nil {
t.Fatal(err)
} else {
assertBlobContents(t, out, firstChunk)
}
// in this case, zerofill won't be used
secondChunk := randomContents(256)
if nn, err := zw.Write("a", "b", 0, bytes.NewReader(secondChunk)); err != nil {
t.Fatal(err)
} else if expected := int64(len(secondChunk)); expected != nn {
t.Fatalf("wrong written bytes count: %v, expected: %v", nn, expected)
}
if out, err := s.GetBlob("a", "b"); err != nil {
t.Fatal(err)
} else {
assertBlobContents(t, out, append(secondChunk, firstChunk[len(secondChunk):]...))
}
}