"io/ioutil"
"log"
"os"
+ "regexp"
"strings"
"time"
azureStorageAccountName string
azureStorageAccountKeyFile string
azureStorageReplication int
- azureWriteRaceInterval time.Duration = 15 * time.Second
- azureWriteRacePollTime time.Duration = time.Second
+ azureWriteRaceInterval = 15 * time.Second
+ azureWriteRacePollTime = time.Second
)
func readKeyFromFile(file string) (string, error) {
replication int
}
+// NewAzureBlobVolume returns a new AzureBlobVolume using the given
+// client and container name. The replication argument specifies the
+// replication level to report when writing data.
func NewAzureBlobVolume(client storage.Client, containerName string, readonly bool, replication int) *AzureBlobVolume {
return &AzureBlobVolume{
azClient: client,
return nil
}
+// Get reads a Keep block that has been stored as a block blob in the
+// container.
+//
+// If the block is younger than azureWriteRaceInterval and is
+// unexpectedly empty, assume a PutBlob operation is in progress, and
+// wait for it to finish writing.
func (v *AzureBlobVolume) Get(loc string) ([]byte, error) {
var deadline time.Time
haveDeadline := false
}
}
+// Compare the given data with existing stored data.
func (v *AzureBlobVolume) Compare(loc string, expect []byte) error {
rdr, err := v.bsClient.GetBlob(v.containerName, loc)
if err != nil {
return compareReaderWithBuf(rdr, expect, loc[:32])
}
+// Put sotres a Keep block as a block blob in the container.
func (v *AzureBlobVolume) Put(loc string, block []byte) error {
if v.readonly {
return MethodDisabledError
return v.bsClient.CreateBlockBlobFromReader(v.containerName, loc, uint64(len(block)), bytes.NewReader(block))
}
+// Touch updates the last-modified property of a block blob.
func (v *AzureBlobVolume) Touch(loc string) error {
if v.readonly {
return MethodDisabledError
})
}
+// Mtime returns the last-modified property of a block blob.
func (v *AzureBlobVolume) Mtime(loc string) (time.Time, error) {
props, err := v.bsClient.GetBlobProperties(v.containerName, loc)
if err != nil {
return time.Parse(time.RFC1123, props.LastModified)
}
+// IndexTo writes a list of Keep blocks that are stored in the
+// container.
func (v *AzureBlobVolume) IndexTo(prefix string, writer io.Writer) error {
params := storage.ListBlobsParameters{
Prefix: prefix,
if err != nil {
return err
}
+ if !v.isKeepBlock(b.Name) {
+ continue
+ }
if b.Properties.ContentLength == 0 && t.Add(azureWriteRaceInterval).After(time.Now()) {
// A new zero-length blob is probably
// just a new non-empty blob that
}
}
+// Delete a Keep block.
func (v *AzureBlobVolume) Delete(loc string) error {
if v.readonly {
return MethodDisabledError
})
}
+// Status returns a VolumeStatus struct with placeholder data.
func (v *AzureBlobVolume) Status() *VolumeStatus {
return &VolumeStatus{
DeviceNum: 1,
}
}
+// String returns a volume label, including the container name.
func (v *AzureBlobVolume) String() string {
return fmt.Sprintf("azure-storage-container:%+q", v.containerName)
}
+// Writable returns true, unless the -readonly flag was on when the
+// volume was added.
func (v *AzureBlobVolume) Writable() bool {
return !v.readonly
}
+// Replication returns the replication level of the container, as
+// specified by the -azure-storage-replication argument.
func (v *AzureBlobVolume) Replication() int {
return v.replication
}
return err
}
}
+
+var keepBlockRegexp = regexp.MustCompile(`^[0-9a-f]{32}$`)
+func (v *AzureBlobVolume) isKeepBlock(s string) bool {
+ return keepBlockRegexp.MatchString(s)
+}