/
azure.go
319 lines (259 loc) · 8.69 KB
/
azure.go
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package azure
import (
"bufio"
"bytes"
"context"
"encoding/base64"
"encoding/binary"
"fmt"
"io"
"path"
"strings"
blob "github.com/Azure/azure-storage-blob-go/azblob"
"github.com/opentracing/opentracing-go"
"github.com/pkg/errors"
"github.com/grafana/tempo/tempodb/backend"
)
const (
// dir represents the char separator used by the blob virtual directory structure
dir = "/"
// max parallelism on uploads
maxParallelism = 3
)
type readerWriter struct {
cfg *Config
containerURL blob.ContainerURL
hedgedContainerURL blob.ContainerURL
}
type appendTracker struct {
Name string
}
// NewNoConfirm gets the Azure blob container without testing it
func NewNoConfirm(cfg *Config) (backend.RawReader, backend.RawWriter, backend.Compactor, error) {
return internalNew(cfg, false)
}
// New gets the Azure blob container
func New(cfg *Config) (backend.RawReader, backend.RawWriter, backend.Compactor, error) {
return internalNew(cfg, true)
}
func internalNew(cfg *Config, confirm bool) (backend.RawReader, backend.RawWriter, backend.Compactor, error) {
ctx := context.Background()
container, err := GetContainer(ctx, cfg, false)
if err != nil {
return nil, nil, nil, errors.Wrap(err, "getting storage container")
}
hedgedContainer, err := GetContainer(ctx, cfg, true)
if err != nil {
return nil, nil, nil, errors.Wrap(err, "getting hedged storage container")
}
if confirm {
// Getting container properties to check if container exists
_, err = container.GetProperties(ctx, blob.LeaseAccessConditions{})
if err != nil {
return nil, nil, nil, fmt.Errorf("failed to GetProperties: %w", err)
}
}
rw := &readerWriter{
cfg: cfg,
containerURL: container,
hedgedContainerURL: hedgedContainer,
}
return rw, rw, rw, nil
}
// Write implements backend.Writer
func (rw *readerWriter) Write(ctx context.Context, name string, keypath backend.KeyPath, data io.Reader, _ int64, _ bool) error {
return rw.writer(ctx, bufio.NewReader(data), backend.ObjectFileName(keypath, name))
}
// Append implements backend.Writer
func (rw *readerWriter) Append(ctx context.Context, name string, keypath backend.KeyPath, tracker backend.AppendTracker, buffer []byte) (backend.AppendTracker, error) {
var a appendTracker
if tracker == nil {
a.Name = backend.ObjectFileName(keypath, name)
err := rw.writeAll(ctx, a.Name, buffer)
if err != nil {
return nil, err
}
} else {
a = tracker.(appendTracker)
err := rw.append(ctx, buffer, a.Name)
if err != nil {
return nil, err
}
}
return a, nil
}
// CloseAppend implements backend.Writer
func (rw *readerWriter) CloseAppend(ctx context.Context, tracker backend.AppendTracker) error {
return nil
}
// List implements backend.Reader
func (rw *readerWriter) List(ctx context.Context, keypath backend.KeyPath) ([]string, error) {
marker := blob.Marker{}
prefix := path.Join(keypath...)
if len(prefix) > 0 {
prefix = prefix + dir
}
objects := make([]string, 0)
for {
list, err := rw.containerURL.ListBlobsHierarchySegment(ctx, marker, dir, blob.ListBlobsSegmentOptions{
Prefix: prefix,
Details: blob.BlobListingDetails{},
})
if err != nil {
return objects, errors.Wrap(err, "iterating tenants")
}
marker = list.NextMarker
for _, blob := range list.Segment.BlobPrefixes {
objects = append(objects, strings.TrimPrefix(strings.TrimSuffix(blob.Name, dir), prefix))
}
// Continue iterating if we are not done.
if !marker.NotDone() {
break
}
}
return objects, nil
}
// Read implements backend.Reader
func (rw *readerWriter) Read(ctx context.Context, name string, keypath backend.KeyPath, _ bool) (io.ReadCloser, int64, error) {
span, derivedCtx := opentracing.StartSpanFromContext(ctx, "Read")
defer span.Finish()
object := backend.ObjectFileName(keypath, name)
b, err := rw.readAll(derivedCtx, object)
if err != nil {
return nil, 0, readError(err)
}
return io.NopCloser(bytes.NewReader(b)), int64(len(b)), nil
}
// ReadRange implements backend.Reader
func (rw *readerWriter) ReadRange(ctx context.Context, name string, keypath backend.KeyPath, offset uint64, buffer []byte) error {
span, derivedCtx := opentracing.StartSpanFromContext(ctx, "azure.ReadRange", opentracing.Tags{
"len": len(buffer),
"offset": offset,
})
defer span.Finish()
object := backend.ObjectFileName(keypath, name)
err := rw.readRange(derivedCtx, object, int64(offset), buffer)
if err != nil {
return readError(err)
}
return nil
}
// Shutdown implements backend.Reader
func (rw *readerWriter) Shutdown() {
}
func (rw *readerWriter) writeAll(ctx context.Context, name string, b []byte) error {
err := rw.writer(ctx, bytes.NewReader(b), name)
if err != nil {
return err
}
return nil
}
func (rw *readerWriter) append(ctx context.Context, src []byte, name string) error {
appendBlobURL := rw.containerURL.NewBlockBlobURL(name)
// These helper functions convert a binary block ID to a base-64 string and vice versa
// NOTE: The blockID must be <= 64 bytes and ALL blockIDs for the block must be the same length
blockIDBinaryToBase64 := func(blockID []byte) string { return base64.StdEncoding.EncodeToString(blockID) }
blockIDIntToBase64 := func(blockID int) string {
binaryBlockID := (&[64]byte{})[:]
binary.LittleEndian.PutUint32(binaryBlockID, uint32(blockID))
return blockIDBinaryToBase64(binaryBlockID)
}
l, err := appendBlobURL.GetBlockList(ctx, blob.BlockListAll, blob.LeaseAccessConditions{})
if err != nil {
return err
}
// generate the next block id
id := blockIDIntToBase64(len(l.CommittedBlocks) + 1)
_, err = appendBlobURL.StageBlock(ctx, id, bytes.NewReader(src), blob.LeaseAccessConditions{}, nil, blob.ClientProvidedKeyOptions{})
if err != nil {
return err
}
base64BlockIDs := make([]string, len(l.CommittedBlocks)+1)
for i := 0; i < len(l.CommittedBlocks); i++ {
base64BlockIDs[i] = l.CommittedBlocks[i].Name
}
base64BlockIDs[len(l.CommittedBlocks)] = id
// After all the blocks are uploaded, atomically commit them to the blob.
_, err = appendBlobURL.CommitBlockList(ctx, base64BlockIDs, blob.BlobHTTPHeaders{}, blob.Metadata{}, blob.BlobAccessConditions{}, blob.DefaultAccessTier, nil, blob.ClientProvidedKeyOptions{})
if err != nil {
return err
}
return nil
}
func (rw *readerWriter) writer(ctx context.Context, src io.Reader, name string) error {
blobURL := rw.containerURL.NewBlockBlobURL(name)
if _, err := blob.UploadStreamToBlockBlob(ctx, src, blobURL,
blob.UploadStreamToBlockBlobOptions{
BufferSize: rw.cfg.BufferSize,
MaxBuffers: rw.cfg.MaxBuffers,
},
); err != nil {
return errors.Wrapf(err, "cannot upload blob, name: %s", name)
}
return nil
}
func (rw *readerWriter) readRange(ctx context.Context, name string, offset int64, destBuffer []byte) error {
blobURL := rw.hedgedContainerURL.NewBlockBlobURL(name)
var props *blob.BlobGetPropertiesResponse
props, err := blobURL.GetProperties(ctx, blob.BlobAccessConditions{}, blob.ClientProvidedKeyOptions{})
if err != nil {
return err
}
length := int64(len(destBuffer))
var size int64
if length > 0 && length <= props.ContentLength()-offset {
size = length
} else {
size = props.ContentLength() - offset
}
if err := blob.DownloadBlobToBuffer(context.Background(), blobURL.BlobURL, offset, size,
destBuffer, blob.DownloadFromBlobOptions{
BlockSize: blob.BlobDefaultDownloadBlockSize,
Parallelism: maxParallelism,
Progress: nil,
RetryReaderOptionsPerBlock: blob.RetryReaderOptions{
MaxRetryRequests: maxRetries,
},
},
); err != nil {
return err
}
_, err = bytes.NewReader(destBuffer).Read(destBuffer)
if err != nil {
return err
}
return nil
}
func (rw *readerWriter) readAll(ctx context.Context, name string) ([]byte, error) {
blobURL := rw.hedgedContainerURL.NewBlockBlobURL(name)
var props *blob.BlobGetPropertiesResponse
props, err := blobURL.GetProperties(ctx, blob.BlobAccessConditions{}, blob.ClientProvidedKeyOptions{})
if err != nil {
return nil, err
}
destBuffer := make([]byte, props.ContentLength())
if err := blob.DownloadBlobToBuffer(context.Background(), blobURL.BlobURL, 0, props.ContentLength(),
destBuffer, blob.DownloadFromBlobOptions{
BlockSize: blob.BlobDefaultDownloadBlockSize,
Parallelism: uint16(maxParallelism),
Progress: nil,
RetryReaderOptionsPerBlock: blob.RetryReaderOptions{
MaxRetryRequests: maxRetries,
},
},
); err != nil {
return nil, err
}
return destBuffer, nil
}
func readError(err error) error {
var storageError blob.StorageError
errors.As(err, &storageError)
if storageError == nil {
return errors.Wrap(err, "reading storage container")
}
if storageError.ServiceCode() == blob.ServiceCodeBlobNotFound {
return backend.ErrDoesNotExist
}
return errors.Wrap(storageError, "reading Azure blob container")
}