Fix azure storagedriver methods, implement Stat, URLFor
Signed-off-by: Ahmet Alp Balkan <ahmetalpbalkan@gmail.com>
This commit is contained in:
parent
bdc268bca3
commit
bc42f53ec8
3 changed files with 136 additions and 40 deletions
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@ -14,7 +14,7 @@ import (
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// An out-of-process Azure Storage driver, intended to be run by ipc.NewDriverClient
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func main() {
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parametersBytes := []byte(os.Args[1])
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var parameters map[string]string
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var parameters map[string]interface{}
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err := json.Unmarshal(parametersBytes, ¶meters)
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if err != nil {
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panic(err)
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@ -1,5 +1,3 @@
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// +build ignore
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// Package azure provides a storagedriver.StorageDriver implementation to
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// store blobs in Microsoft Azure Blob Storage Service.
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package azure
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@ -10,8 +8,10 @@ import (
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"strconv"
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"strings"
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"time"
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"github.com/docker/distribution/storagedriver"
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"github.com/docker/distribution/storagedriver/factory"
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@ -40,28 +40,28 @@ func init() {
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type azureDriverFactory struct{}
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func (factory *azureDriverFactory) Create(parameters map[string]string) (storagedriver.StorageDriver, error) {
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func (factory *azureDriverFactory) Create(parameters map[string]interface{}) (storagedriver.StorageDriver, error) {
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return FromParameters(parameters)
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}
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// FromParameters constructs a new Driver with a given parameters map.
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func FromParameters(parameters map[string]string) (*Driver, error) {
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func FromParameters(parameters map[string]interface{}) (*Driver, error) {
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accountName, ok := parameters[paramAccountName]
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if !ok {
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if !ok || fmt.Sprint(accountName) == "" {
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return nil, fmt.Errorf("No %s parameter provided", paramAccountName)
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}
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accountKey, ok := parameters[paramAccountKey]
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if !ok {
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if !ok || fmt.Sprint(accountKey) == "" {
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return nil, fmt.Errorf("No %s parameter provided", paramAccountKey)
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}
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container, ok := parameters[paramContainer]
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if !ok {
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if !ok || fmt.Sprint(container) == "" {
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return nil, fmt.Errorf("No %s parameter provided", paramContainer)
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}
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return New(accountName, accountKey, container)
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return New(fmt.Sprint(accountName), fmt.Sprint(accountKey), fmt.Sprint(container))
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}
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// New constructs a new Driver with the given Azure Storage Account credentials
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@ -87,6 +87,10 @@ func New(accountName, accountKey, container string) (*Driver, error) {
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// GetContent retrieves the content stored at "path" as a []byte.
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func (d *Driver) GetContent(path string) ([]byte, error) {
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if !storagedriver.PathRegexp.MatchString(path) {
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return nil, storagedriver.InvalidPathError{Path: path}
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}
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blob, err := d.client.GetBlob(d.container, path)
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if err != nil {
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if is404(err) {
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@ -100,25 +104,29 @@ func (d *Driver) GetContent(path string) ([]byte, error) {
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// PutContent stores the []byte content at a location designated by "path".
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func (d *Driver) PutContent(path string, contents []byte) error {
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if !storagedriver.PathRegexp.MatchString(path) {
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return storagedriver.InvalidPathError{Path: path}
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}
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return d.client.PutBlockBlob(d.container, path, ioutil.NopCloser(bytes.NewReader(contents)))
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}
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// ReadStream retrieves an io.ReadCloser for the content stored at "path" with a
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// given byte offset.
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func (d *Driver) ReadStream(path string, offset int64) (io.ReadCloser, error) {
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func (d *driver) ReadStream(path string, offset int64) (io.ReadCloser, error) {
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if ok, err := d.client.BlobExists(d.container, path); err != nil {
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return nil, err
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} else if !ok {
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return nil, storagedriver.PathNotFoundError{Path: path}
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}
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size, err := d.CurrentSize(path)
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info, err := d.client.GetBlobProperties(d.container, path)
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if err != nil {
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return nil, err
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}
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if offset >= int64(size) {
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return nil, storagedriver.InvalidOffsetError{Path: path, Offset: offset}
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size := int64(info.ContentLength)
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if offset >= size {
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return ioutil.NopCloser(bytes.NewReader(nil)), nil
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}
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bytesRange := fmt.Sprintf("%v-", offset)
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@ -131,7 +139,11 @@ func (d *Driver) ReadStream(path string, offset int64) (io.ReadCloser, error) {
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// WriteStream stores the contents of the provided io.ReadCloser at a location
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// designated by the given path.
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func (d *Driver) WriteStream(path string, offset, size int64, reader io.ReadCloser) error {
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func (d *Driver) WriteStream(path string, offset int64, reader io.Reader) (int64, error) {
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if !storagedriver.PathRegexp.MatchString(path) {
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return 0, storagedriver.InvalidPathError{Path: path}
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}
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var (
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lastBlockNum int
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resumableOffset int64
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@ -139,20 +151,20 @@ func (d *Driver) WriteStream(path string, offset, size int64, reader io.ReadClos
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)
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if blobExists, err := d.client.BlobExists(d.container, path); err != nil {
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return err
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return 0, err
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} else if !blobExists { // new blob
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lastBlockNum = 0
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resumableOffset = 0
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} else { // append
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if parts, err := d.client.GetBlockList(d.container, path, azure.BlockListTypeCommitted); err != nil {
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return err
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return 0, err
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} else if len(parts.CommittedBlocks) == 0 {
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lastBlockNum = 0
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resumableOffset = 0
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} else {
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lastBlock := parts.CommittedBlocks[len(parts.CommittedBlocks)-1]
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if lastBlockNum, err = blockNum(lastBlock.Name); err != nil {
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return fmt.Errorf("Cannot parse block name as number '%s': %s", lastBlock.Name, err.Error())
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if lastBlockNum, err = fromBlockID(lastBlock.Name); err != nil {
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return 0, fmt.Errorf("Cannot parse block name as number '%s': %s", lastBlock.Name, err.Error())
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}
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var totalSize int64
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@ -174,11 +186,17 @@ func (d *Driver) WriteStream(path string, offset, size int64, reader io.ReadClos
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}
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}
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if offset != resumableOffset {
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return storagedriver.InvalidOffsetError{Path: path, Offset: offset}
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if offset < resumableOffset {
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// only writing at the end or after the end of the file is supported
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return 0, storagedriver.InvalidOffsetError{Path: path, Offset: offset}
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} else if offset > resumableOffset {
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// zero-fill in between, construct a multi-reader
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zeroReader := bytes.NewReader(make([]byte, offset-resumableOffset))
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reader = io.MultiReader(zeroReader, reader)
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}
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// Put content
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var nn int64
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buf := make([]byte, azure.MaxBlobBlockSize)
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for {
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// Read chunks of exactly size N except the last chunk to
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@ -187,35 +205,89 @@ func (d *Driver) WriteStream(path string, offset, size int64, reader io.ReadClos
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if err == io.EOF {
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break
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}
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nn += int64(n)
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data := buf[:n]
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blockID := toBlockID(lastBlockNum + 1)
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lastBlockNum++
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blockID := toBlockID(lastBlockNum)
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if err = d.client.PutBlock(d.container, path, blockID, data); err != nil {
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return err
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return 0, err
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}
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blocks = append(blocks, azure.Block{
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Id: blockID,
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Status: azure.BlockStatusLatest})
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lastBlockNum++
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}
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// If there was a zero-fill, adjust nn to exclude zeros
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if offset > resumableOffset {
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nn -= offset - resumableOffset
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}
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// Commit block list
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return d.client.PutBlockList(d.container, path, blocks)
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return nn, d.client.PutBlockList(d.container, path, blocks)
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}
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// CurrentSize retrieves the curernt size in bytes of the object at the given
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// path.
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func (d *Driver) CurrentSize(path string) (uint64, error) {
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props, err := d.client.GetBlobProperties(d.container, path)
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if err != nil {
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return 0, err
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// Stat retrieves the FileInfo for the given path, including the current size
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// in bytes and the creation time.
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func (d *Driver) Stat(path string) (storagedriver.FileInfo, error) {
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if !storagedriver.PathRegexp.MatchString(path) {
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return nil, storagedriver.InvalidPathError{Path: path}
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}
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return props.ContentLength, nil
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// Check if the path is a blob
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if ok, err := d.client.BlobExists(d.container, path); err != nil {
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return nil, err
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} else if ok {
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blob, err := d.client.GetBlobProperties(d.container, path)
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if err != nil {
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return nil, err
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}
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mtim, err := time.Parse(http.TimeFormat, blob.LastModified)
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if err != nil {
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return nil, err
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}
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return storagedriver.FileInfoInternal{FileInfoFields: storagedriver.FileInfoFields{
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Path: path,
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Size: int64(blob.ContentLength),
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ModTime: mtim,
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IsDir: false,
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}}, nil
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}
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// Check if path is a virtual container
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virtContainerPath := path
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if !strings.HasSuffix(virtContainerPath, "/") {
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virtContainerPath += "/"
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}
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blobs, err := d.client.ListBlobs(d.container, azure.ListBlobsParameters{
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Prefix: virtContainerPath,
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MaxResults: 1,
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})
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if err != nil {
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return nil, err
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}
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if len(blobs.Blobs) > 0 {
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// path is a virtual container
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return storagedriver.FileInfoInternal{FileInfoFields: storagedriver.FileInfoFields{
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Path: path,
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IsDir: true,
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}}, nil
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}
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// path is not a blob or virtual container
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return nil, storagedriver.PathNotFoundError{Path: path}
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}
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// List returns a list of the objects that are direct descendants of the given
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// path.
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func (d *Driver) List(path string) ([]string, error) {
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if !storagedriver.PathRegexp.MatchString(path) && path != "/" {
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return nil, storagedriver.InvalidPathError{Path: path}
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}
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if path == "/" {
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path = ""
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}
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@ -232,6 +304,12 @@ func (d *Driver) List(path string) ([]string, error) {
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// Move moves an object stored at sourcePath to destPath, removing the original
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// object.
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func (d *Driver) Move(sourcePath string, destPath string) error {
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if !storagedriver.PathRegexp.MatchString(sourcePath) {
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return storagedriver.InvalidPathError{Path: sourcePath}
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} else if !storagedriver.PathRegexp.MatchString(destPath) {
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return storagedriver.InvalidPathError{Path: destPath}
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}
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sourceBlobURL := d.client.GetBlobUrl(d.container, sourcePath)
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err := d.client.CopyBlob(d.container, destPath, sourceBlobURL)
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if err != nil {
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@ -246,6 +324,10 @@ func (d *Driver) Move(sourcePath string, destPath string) error {
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// Delete recursively deletes all objects stored at "path" and its subpaths.
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func (d *Driver) Delete(path string) error {
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if !storagedriver.PathRegexp.MatchString(path) {
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return storagedriver.InvalidPathError{Path: path}
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}
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ok, err := d.client.DeleteBlobIfExists(d.container, path)
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if err != nil {
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return err
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@ -272,6 +354,21 @@ func (d *Driver) Delete(path string) error {
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return nil
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}
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// URLFor returns a publicly accessible URL for the blob stored at given path
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// for specified duration by making use of Azure Storage Shared Access Signatures (SAS).
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// See https://msdn.microsoft.com/en-us/library/azure/ee395415.aspx for more info.
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func (d *driver) URLFor(path string, options map[string]interface{}) (string, error) {
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expiresTime := time.Now().UTC().Add(20 * time.Minute) // default expiration
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expires, ok := options["expiry"]
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if ok {
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t, ok := expires.(time.Time)
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if ok {
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expiresTime = t
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}
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}
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return d.client.GetBlobSASURI(d.container, path, expiresTime, "r")
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}
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// directDescendants will find direct descendants (blobs or virtual containers)
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// of from list of blob paths and will return their full paths. Elements in blobs
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// list must be prefixed with a "/" and
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@ -340,7 +437,7 @@ func is404(err error) bool {
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return ok && e.StatusCode == 404
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}
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func blockNum(b64Name string) (int, error) {
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func fromBlockID(b64Name string) (int, error) {
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s, err := base64.StdEncoding.DecodeString(b64Name)
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if err != nil {
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return 0, err
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@ -350,5 +447,6 @@ func blockNum(b64Name string) (int, error) {
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}
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func toBlockID(i int) string {
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return base64.StdEncoding.EncodeToString([]byte(strconv.Itoa(i)))
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s := fmt.Sprintf("%010d", i) // add zero padding
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return base64.StdEncoding.EncodeToString([]byte(s))
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}
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@ -1,5 +1,3 @@
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// +build ignore
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package azure
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import (
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@ -59,9 +57,9 @@ func init() {
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}
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testsuites.RegisterInProcessSuite(azureDriverConstructor, skipCheck)
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testsuites.RegisterIPCSuite(driverName, map[string]string{
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paramAccountName: accountName,
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paramAccountKey: accountKey,
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paramContainer: container,
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}, skipCheck)
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// testsuites.RegisterIPCSuite(driverName, map[string]string{
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// paramAccountName: accountName,
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// paramAccountKey: accountKey,
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// paramContainer: container,
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// }, skipCheck)
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}
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