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cleanup: a small Azure driver cleanup

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Just so we can make the code a bit more consistent with the rest of the
storage drivers.

Signed-off-by: Milos Gajdos <milosthegajdos@gmail.com>
This commit is contained in:
Milos Gajdos 2023-10-27 10:44:53 +01:00
parent 6c694cbcf6
commit e8e46b2195
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1 changed files with 48 additions and 29 deletions
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77
registry/storage/driver/azure/azure.go
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@ -18,6 +18,7 @@ import (
"github.com/Azure/azure-sdk-for-go/sdk/azcore/streaming"
"github.com/Azure/azure-sdk-for-go/sdk/storage/azblob/blob"
"github.com/Azure/azure-sdk-for-go/sdk/storage/azblob/bloberror"
"github.com/Azure/azure-sdk-for-go/sdk/storage/azblob/blockblob"
"github.com/Azure/azure-sdk-for-go/sdk/storage/azblob/container"
)
@ -26,6 +27,8 @@ const (
maxChunkSize = 4 * 1024 * 1024
)
var _ storagedriver.StorageDriver = &driver{}
type driver struct {
azClient *azureClient
client *container.Client
@ -34,11 +37,15 @@ type driver struct {
copyStatusPollDelay time.Duration
}
type baseEmbed struct{ base.Base }
type baseEmbed struct {
base.Base
}
// Driver is a storagedriver.StorageDriver implementation backed by
// Microsoft Azure Blob Storage Service.
type Driver struct{ baseEmbed }
type Driver struct {
baseEmbed
}
func init() {
factory.Register(driverName, &azureDriverFactory{})
@ -74,7 +81,12 @@ func New(params *Parameters) (*Driver, error) {
copyStatusPollMaxRetry: params.CopyStatusPollMaxRetry,
copyStatusPollDelay: copyStatusPollDelay,
}
return &Driver{baseEmbed: baseEmbed{Base: base.Base{StorageDriver: d}}}, nil
return &Driver{
baseEmbed: baseEmbed{
Base: base.Base{
StorageDriver: d,
},
}}, nil
}
// Implement the storagedriver.StorageDriver interface.
@ -84,25 +96,25 @@ func (d *driver) Name() string {
// GetContent retrieves the content stored at "path" as a []byte.
func (d *driver) GetContent(ctx context.Context, path string) ([]byte, error) {
downloadResponse, err := d.client.NewBlobClient(d.blobName(path)).DownloadStream(ctx, nil)
// TODO(milosgajdos): should we get a RetryReader here?
resp, err := d.client.NewBlobClient(d.blobName(path)).DownloadStream(ctx, nil)
if err != nil {
if is404(err) {
return nil, storagedriver.PathNotFoundError{Path: path}
}
return nil, err
}
body := downloadResponse.Body
defer body.Close()
return io.ReadAll(body)
defer resp.Body.Close()
return io.ReadAll(resp.Body)
}
// PutContent stores the []byte content at a location designated by "path".
func (d *driver) PutContent(ctx context.Context, path string, contents []byte) error {
// TODO(milosgajdos): this check is not needed as UploadBuffer will return error if we exceed the max blockbytes limit
// max size for block blobs uploaded via single "Put Blob" for version after "2016-05-31"
// https://docs.microsoft.com/en-us/rest/api/storageservices/put-blob#remarks
const limit = 256 * 1024 * 1024
if len(contents) > limit {
return fmt.Errorf("uploading %d bytes with PutContent is not supported; limit: %d bytes", len(contents), limit)
if len(contents) > blockblob.MaxUploadBlobBytes {
return fmt.Errorf("content size exceeds max allowed limit (%d): %d", blockblob.MaxUploadBlobBytes, len(contents))
}
// Historically, blobs uploaded via PutContent used to be of type AppendBlob
@ -128,6 +140,7 @@ func (d *driver) PutContent(ctx context.Context, path string, contents []byte) e
}
}
// TODO(milosgajdos): should we set some concurrency options on UploadBuffer
_, err = d.client.NewBlockBlobClient(blobName).UploadBuffer(ctx, contents, nil)
return err
}
@ -149,13 +162,14 @@ func (d *driver) Reader(ctx context.Context, path string, offset int64) (io.Read
return nil, fmt.Errorf("failed to get blob properties: %v", err)
}
if props.ContentLength == nil {
return nil, fmt.Errorf("failed to get ContentLength for path: %s", path)
return nil, fmt.Errorf("missing ContentLength: %s", path)
}
size := *props.ContentLength
if offset >= size {
return io.NopCloser(bytes.NewReader(nil)), nil
}
// TODO(milosgajdos): should we get a RetryReader here?
resp, err := blobRef.DownloadStream(ctx, &options)
if err != nil {
if is404(err) {
@ -168,7 +182,7 @@ func (d *driver) Reader(ctx context.Context, path string, offset int64) (io.Read
// Writer returns a FileWriter which will store the content written to it
// at the location designated by "path" after the call to Commit.
func (d *driver) Writer(ctx context.Context, path string, append bool) (storagedriver.FileWriter, error) {
func (d *driver) Writer(ctx context.Context, path string, appendMode bool) (storagedriver.FileWriter, error) {
blobName := d.blobName(path)
blobRef := d.client.NewBlobClient(blobName)
@ -183,9 +197,9 @@ func (d *driver) Writer(ctx context.Context, path string, append bool) (storaged
var size int64
if blobExists {
if append {
if appendMode {
if props.ContentLength == nil {
return nil, fmt.Errorf("cannot append to blob because no ContentLength property was returned for: %s", blobName)
return nil, fmt.Errorf("missing ContentLength: %s", blobName)
}
size = *props.ContentLength
} else {
@ -194,7 +208,7 @@ func (d *driver) Writer(ctx context.Context, path string, append bool) (storaged
}
}
} else {
if append {
if appendMode {
return nil, storagedriver.PathNotFoundError{Path: path}
}
if _, err = d.client.NewAppendBlobClient(blobName).Create(ctx, nil); err != nil {
@ -225,14 +239,15 @@ func (d *driver) Stat(ctx context.Context, path string) (storagedriver.FileInfo,
}
if len(missing) > 0 {
return nil, fmt.Errorf("required blob properties %s are missing for blob: %s", missing, blobName)
return nil, fmt.Errorf("missing required prroperties (%s) for blob: %s", missing, blobName)
}
return storagedriver.FileInfoInternal{FileInfoFields: storagedriver.FileInfoFields{
Path: path,
Size: *props.ContentLength,
ModTime: *props.LastModified,
IsDir: false,
}}, nil
return storagedriver.FileInfoInternal{
FileInfoFields: storagedriver.FileInfoFields{
Path: path,
Size: *props.ContentLength,
ModTime: *props.LastModified,
IsDir: false,
}}, nil
}
// Check if path is a virtual container
@ -253,10 +268,11 @@ func (d *driver) Stat(ctx context.Context, path string) (storagedriver.FileInfo,
}
if len(resp.Segment.BlobItems) > 0 {
// path is a virtual container
return storagedriver.FileInfoInternal{FileInfoFields: storagedriver.FileInfoFields{
Path: path,
IsDir: true,
}}, nil
return storagedriver.FileInfoInternal{
FileInfoFields: storagedriver.FileInfoFields{
Path: path,
IsDir: true,
}}, nil
}
}
@ -452,10 +468,9 @@ func (d *driver) listBlobs(ctx context.Context, virtPath string) ([]string, erro
}
for _, blob := range resp.Segment.BlobItems {
if blob.Name == nil {
return nil, fmt.Errorf("required blob property Name is missing while listing blobs under: %s", listPrefix)
return nil, fmt.Errorf("missing blob Name when listing prefix: %s", listPrefix)
}
name := *blob.Name
out = append(out, strings.Replace(name, blobPrefix, prefix, 1))
out = append(out, strings.Replace(*blob.Name, blobPrefix, prefix, 1))
}
}
@ -473,6 +488,7 @@ func (d *driver) blobName(path string) string {
return strings.TrimLeft(strings.TrimRight(d.rootDirectory, "/")+path, "/")
}
// TODO(milosgajdos): consider renaming this func
func is404(err error) bool {
return bloberror.HasCode(
err,
@ -483,6 +499,8 @@ func is404(err error) bool {
)
}
var _ storagedriver.FileWriter = &writer{}
type writer struct {
driver *driver
path string
@ -498,6 +516,7 @@ func (d *driver) newWriter(ctx context.Context, path string, size int64) storage
driver: d,
path: path,
size: size,
// TODO(milosgajdos): I'm not sure about the maxChunkSize
bw: bufio.NewWriterSize(&blockWriter{
ctx: ctx,
client: d.client,