forked from minio/minio
/
gateway-azure.go
1040 lines (925 loc) · 33.6 KB
/
gateway-azure.go
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/*
* Minio Cloud Storage, (C) 2017, 2018 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package azure
import (
"bytes"
"context"
"crypto/rand"
"encoding/base64"
"encoding/hex"
"encoding/json"
"fmt"
"io"
"net/http"
"sort"
"strconv"
"strings"
"time"
"github.com/Azure/azure-sdk-for-go/storage"
humanize "github.com/dustin/go-humanize"
"github.com/minio/cli"
"github.com/minio/minio-go/pkg/policy"
"github.com/minio/minio/pkg/auth"
"github.com/minio/minio/pkg/errors"
"github.com/minio/minio/pkg/hash"
sha256 "github.com/minio/sha256-simd"
minio "github.com/minio/minio/cmd"
)
const (
globalAzureAPIVersion = "2016-05-31"
azureBlockSize = 100 * humanize.MiByte
azureS3MinPartSize = 5 * humanize.MiByte
metadataObjectNameTemplate = minio.GatewayMinioSysTmp + "multipart/v1/%s.%x/azure.json"
azureBackend = "azure"
)
func init() {
const azureGatewayTemplate = `NAME:
{{.HelpName}} - {{.Usage}}
USAGE:
{{.HelpName}} {{if .VisibleFlags}}[FLAGS]{{end}} [ENDPOINT]
{{if .VisibleFlags}}
FLAGS:
{{range .VisibleFlags}}{{.}}
{{end}}{{end}}
ENDPOINT:
Azure server endpoint. Default ENDPOINT is https://core.windows.net
ENVIRONMENT VARIABLES:
ACCESS:
MINIO_ACCESS_KEY: Username or access key of Azure storage.
MINIO_SECRET_KEY: Password or secret key of Azure storage.
BROWSER:
MINIO_BROWSER: To disable web browser access, set this value to "off".
CACHE:
MINIO_CACHE_DRIVES: List of mounted drives or directories delimited by ";".
MINIO_CACHE_EXCLUDE: List of cache exclusion patterns delimited by ";".
MINIO_CACHE_EXPIRY: Cache expiry duration in days.
UPDATE:
MINIO_UPDATE: To turn off in-place upgrades, set this value to "off".
DOMAIN:
MINIO_DOMAIN: To enable virtual-host-style requests, set this value to Minio host domain name.
EXAMPLES:
1. Start minio gateway server for Azure Blob Storage backend.
$ export MINIO_ACCESS_KEY=azureaccountname
$ export MINIO_SECRET_KEY=azureaccountkey
$ {{.HelpName}}
2. Start minio gateway server for Azure Blob Storage backend on custom endpoint.
$ export MINIO_ACCESS_KEY=azureaccountname
$ export MINIO_SECRET_KEY=azureaccountkey
$ {{.HelpName}} https://azure.example.com
3. Start minio gateway server for Azure Blob Storage backend with edge caching enabled.
$ export MINIO_ACCESS_KEY=azureaccountname
$ export MINIO_SECRET_KEY=azureaccountkey
$ export MINIO_CACHE_DRIVES="/mnt/drive1;/mnt/drive2;/mnt/drive3;/mnt/drive4"
$ export MINIO_CACHE_EXCLUDE="bucket1/*;*.png"
$ export MINIO_CACHE_EXPIRY=40
$ {{.HelpName}}
`
minio.RegisterGatewayCommand(cli.Command{
Name: azureBackend,
Usage: "Microsoft Azure Blob Storage.",
Action: azureGatewayMain,
CustomHelpTemplate: azureGatewayTemplate,
HideHelpCommand: true,
})
}
// Handler for 'minio gateway azure' command line.
func azureGatewayMain(ctx *cli.Context) {
// Validate gateway arguments.
host := ctx.Args().First()
// Validate gateway arguments.
minio.FatalIf(minio.ValidateGatewayArguments(ctx.GlobalString("address"), host), "Invalid argument")
minio.StartGateway(ctx, &Azure{host})
}
// Azure implements Gateway.
type Azure struct {
host string
}
// Name implements Gateway interface.
func (g *Azure) Name() string {
return azureBackend
}
// NewGatewayLayer initializes azure blob storage client and returns AzureObjects.
func (g *Azure) NewGatewayLayer(creds auth.Credentials) (minio.ObjectLayer, error) {
var err error
var endpoint = storage.DefaultBaseURL
var secure = true
// If user provided some parameters
if g.host != "" {
endpoint, secure, err = minio.ParseGatewayEndpoint(g.host)
if err != nil {
return nil, err
}
}
if endpoint == fmt.Sprintf("%s.blob.%s", creds.AccessKey, storage.DefaultBaseURL) {
// If, by mistake, user provides endpoint as accountname.blob.core.windows.net
endpoint = storage.DefaultBaseURL
}
c, err := storage.NewClient(creds.AccessKey, creds.SecretKey, endpoint, globalAzureAPIVersion, secure)
if err != nil {
return &azureObjects{}, err
}
c.HTTPClient = &http.Client{Transport: minio.NewCustomHTTPTransport()}
return &azureObjects{
client: c.GetBlobService(),
}, nil
}
// Production - Azure gateway is production ready.
func (g *Azure) Production() bool {
return true
}
// s3MetaToAzureProperties converts metadata meant for S3 PUT/COPY
// object into Azure data structures - BlobMetadata and
// BlobProperties.
//
// BlobMetadata contains user defined key-value pairs and each key is
// automatically prefixed with `X-Ms-Meta-` by the Azure SDK. S3
// user-metadata is translated to Azure metadata by removing the
// `X-Amz-Meta-` prefix.
//
// BlobProperties contains commonly set metadata for objects such as
// Content-Encoding, etc. Such metadata that is accepted by S3 is
// copied into BlobProperties.
//
// Header names are canonicalized as in http.Header.
func s3MetaToAzureProperties(s3Metadata map[string]string) (storage.BlobMetadata,
storage.BlobProperties, error) {
for k := range s3Metadata {
if strings.Contains(k, "--") {
return storage.BlobMetadata{}, storage.BlobProperties{}, errors.Trace(minio.UnsupportedMetadata{})
}
}
// Encoding technique for each key is used here is as follows
// Each '-' is converted to '_'
// Each '_' is converted to '__'
// With this basic assumption here are some of the expected
// translations for these keys.
// i: 'x-S3cmd_attrs' -> o: 'x_s3cmd__attrs' (mixed)
// i: 'x__test__value' -> o: 'x____test____value' (double '_')
encodeKey := func(key string) string {
tokens := strings.Split(key, "_")
for i := range tokens {
tokens[i] = strings.Replace(tokens[i], "-", "_", -1)
}
return strings.Join(tokens, "__")
}
var blobMeta storage.BlobMetadata = make(map[string]string)
var props storage.BlobProperties
for k, v := range s3Metadata {
k = http.CanonicalHeaderKey(k)
switch {
case strings.HasPrefix(k, "X-Amz-Meta-"):
// Strip header prefix, to let Azure SDK
// handle it for storage.
k = strings.Replace(k, "X-Amz-Meta-", "", 1)
blobMeta[encodeKey(k)] = v
// All cases below, extract common metadata that is
// accepted by S3 into BlobProperties for setting on
// Azure - see
// https://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectPUT.html
case k == "Cache-Control":
props.CacheControl = v
case k == "Content-Disposition":
props.ContentDisposition = v
case k == "Content-Encoding":
props.ContentEncoding = v
case k == "Content-Length":
// assume this doesn't fail
props.ContentLength, _ = strconv.ParseInt(v, 10, 64)
case k == "Content-Md5":
props.ContentMD5 = v
case k == "Content-Type":
props.ContentType = v
}
}
return blobMeta, props, nil
}
// azurePropertiesToS3Meta converts Azure metadata/properties to S3
// metadata. It is the reverse of s3MetaToAzureProperties. Azure's
// `.GetMetadata()` lower-cases all header keys, so this is taken into
// account by this function.
func azurePropertiesToS3Meta(meta storage.BlobMetadata, props storage.BlobProperties) map[string]string {
// Decoding technique for each key is used here is as follows
// Each '_' is converted to '-'
// Each '__' is converted to '_'
// With this basic assumption here are some of the expected
// translations for these keys.
// i: 'x_s3cmd__attrs' -> o: 'x-s3cmd_attrs' (mixed)
// i: 'x____test____value' -> o: 'x__test__value' (double '_')
decodeKey := func(key string) string {
tokens := strings.Split(key, "__")
for i := range tokens {
tokens[i] = strings.Replace(tokens[i], "_", "-", -1)
}
return strings.Join(tokens, "_")
}
s3Metadata := make(map[string]string)
for k, v := range meta {
// k's `x-ms-meta-` prefix is already stripped by
// Azure SDK, so we add the AMZ prefix.
k = "X-Amz-Meta-" + decodeKey(k)
k = http.CanonicalHeaderKey(k)
s3Metadata[k] = v
}
// Add each property from BlobProperties that is supported by
// S3 PUT/COPY common metadata.
if props.CacheControl != "" {
s3Metadata["Cache-Control"] = props.CacheControl
}
if props.ContentDisposition != "" {
s3Metadata["Content-Disposition"] = props.ContentDisposition
}
if props.ContentEncoding != "" {
s3Metadata["Content-Encoding"] = props.ContentEncoding
}
if props.ContentLength != 0 {
s3Metadata["Content-Length"] = fmt.Sprintf("%d", props.ContentLength)
}
if props.ContentMD5 != "" {
s3Metadata["Content-MD5"] = props.ContentMD5
}
if props.ContentType != "" {
s3Metadata["Content-Type"] = props.ContentType
}
return s3Metadata
}
// azureObjects - Implements Object layer for Azure blob storage.
type azureObjects struct {
minio.GatewayUnsupported
client storage.BlobStorageClient // Azure sdk client
}
// Convert azure errors to minio object layer errors.
func azureToObjectError(err error, params ...string) error {
if err == nil {
return nil
}
e, ok := err.(*errors.Error)
if !ok {
// Code should be fixed if this function is called without doing errors.Trace()
// Else handling different situations in this function makes this function complicated.
minio.ErrorIf(err, "Expected type *Error")
return err
}
err = e.Cause
bucket := ""
object := ""
if len(params) >= 1 {
bucket = params[0]
}
if len(params) == 2 {
object = params[1]
}
azureErr, ok := err.(storage.AzureStorageServiceError)
if !ok {
// We don't interpret non Azure errors. As azure errors will
// have StatusCode to help to convert to object errors.
return e
}
switch azureErr.Code {
case "ContainerAlreadyExists":
err = minio.BucketExists{Bucket: bucket}
case "InvalidResourceName":
err = minio.BucketNameInvalid{Bucket: bucket}
case "RequestBodyTooLarge":
err = minio.PartTooBig{}
case "InvalidMetadata":
err = minio.UnsupportedMetadata{}
default:
switch azureErr.StatusCode {
case http.StatusNotFound:
if object != "" {
err = minio.ObjectNotFound{
Bucket: bucket,
Object: object,
}
} else {
err = minio.BucketNotFound{Bucket: bucket}
}
case http.StatusBadRequest:
err = minio.BucketNameInvalid{Bucket: bucket}
}
}
e.Cause = err
return e
}
// mustGetAzureUploadID - returns new upload ID which is hex encoded 8 bytes random value.
// this 8 byte restriction is needed because Azure block id has a restriction of length
// upto 8 bytes.
func mustGetAzureUploadID() string {
var id [8]byte
n, err := io.ReadFull(rand.Reader, id[:])
if err != nil {
panic(fmt.Errorf("unable to generate upload ID for azure. %s", err))
}
if n != len(id) {
panic(fmt.Errorf("insufficient random data (expected: %d, read: %d)", len(id), n))
}
return hex.EncodeToString(id[:])
}
// checkAzureUploadID - returns error in case of given string is upload ID.
func checkAzureUploadID(uploadID string) (err error) {
if len(uploadID) != 16 {
return errors.Trace(minio.MalformedUploadID{
UploadID: uploadID,
})
}
if _, err = hex.DecodeString(uploadID); err != nil {
return errors.Trace(minio.MalformedUploadID{
UploadID: uploadID,
})
}
return nil
}
// Encode partID, subPartNumber, uploadID and md5Hex to blockID.
func azureGetBlockID(partID, subPartNumber int, uploadID, md5Hex string) string {
return base64.StdEncoding.EncodeToString([]byte(fmt.Sprintf("%05d.%02d.%s.%s", partID, subPartNumber, uploadID, md5Hex)))
}
// Parse blockID into partID, subPartNumber and md5Hex.
func azureParseBlockID(blockID string) (partID, subPartNumber int, uploadID, md5Hex string, err error) {
var blockIDBytes []byte
if blockIDBytes, err = base64.StdEncoding.DecodeString(blockID); err != nil {
return
}
tokens := strings.Split(string(blockIDBytes), ".")
if len(tokens) != 4 {
err = fmt.Errorf("invalid block id '%s'", string(blockIDBytes))
return
}
if partID, err = strconv.Atoi(tokens[0]); err != nil || partID <= 0 {
err = fmt.Errorf("invalid part number in block id '%s'", string(blockIDBytes))
return
}
if subPartNumber, err = strconv.Atoi(tokens[1]); err != nil || subPartNumber <= 0 {
err = fmt.Errorf("invalid sub-part number in block id '%s'", string(blockIDBytes))
return
}
uploadID = tokens[2]
md5Hex = tokens[3]
return
}
// Shutdown - save any gateway metadata to disk
// if necessary and reload upon next restart.
func (a *azureObjects) Shutdown(ctx context.Context) error {
return nil
}
// StorageInfo - Not relevant to Azure backend.
func (a *azureObjects) StorageInfo(ctx context.Context) (si minio.StorageInfo) {
return si
}
// MakeBucketWithLocation - Create a new container on azure backend.
func (a *azureObjects) MakeBucketWithLocation(ctx context.Context, bucket, location string) error {
container := a.client.GetContainerReference(bucket)
err := container.Create(&storage.CreateContainerOptions{
Access: storage.ContainerAccessTypePrivate,
})
return azureToObjectError(errors.Trace(err), bucket)
}
// GetBucketInfo - Get bucket metadata..
func (a *azureObjects) GetBucketInfo(ctx context.Context, bucket string) (bi minio.BucketInfo, e error) {
// Verify if bucket (container-name) is valid.
// IsValidBucketName has same restrictions as container names mentioned
// in azure documentation, so we will simply use the same function here.
// Ref - https://docs.microsoft.com/en-us/rest/api/storageservices/naming-and-referencing-containers--blobs--and-metadata
if !minio.IsValidBucketName(bucket) {
return bi, errors.Trace(minio.BucketNameInvalid{Bucket: bucket})
}
// Azure does not have an equivalent call, hence use
// ListContainers with prefix
resp, err := a.client.ListContainers(storage.ListContainersParameters{
Prefix: bucket,
})
if err != nil {
return bi, azureToObjectError(errors.Trace(err), bucket)
}
for _, container := range resp.Containers {
if container.Name == bucket {
t, e := time.Parse(time.RFC1123, container.Properties.LastModified)
if e == nil {
return minio.BucketInfo{
Name: bucket,
Created: t,
}, nil
} // else continue
}
}
return bi, errors.Trace(minio.BucketNotFound{Bucket: bucket})
}
// ListBuckets - Lists all azure containers, uses Azure equivalent ListContainers.
func (a *azureObjects) ListBuckets(ctx context.Context) (buckets []minio.BucketInfo, err error) {
resp, err := a.client.ListContainers(storage.ListContainersParameters{})
if err != nil {
return nil, azureToObjectError(errors.Trace(err))
}
for _, container := range resp.Containers {
t, e := time.Parse(time.RFC1123, container.Properties.LastModified)
if e != nil {
return nil, errors.Trace(e)
}
buckets = append(buckets, minio.BucketInfo{
Name: container.Name,
Created: t,
})
}
return buckets, nil
}
// DeleteBucket - delete a container on azure, uses Azure equivalent DeleteContainer.
func (a *azureObjects) DeleteBucket(ctx context.Context, bucket string) error {
container := a.client.GetContainerReference(bucket)
return azureToObjectError(errors.Trace(container.Delete(nil)), bucket)
}
// ListObjects - lists all blobs on azure with in a container filtered by prefix
// and marker, uses Azure equivalent ListBlobs.
func (a *azureObjects) ListObjects(ctx context.Context, bucket, prefix, marker, delimiter string, maxKeys int) (result minio.ListObjectsInfo, err error) {
var objects []minio.ObjectInfo
var prefixes []string
container := a.client.GetContainerReference(bucket)
for len(objects) == 0 && len(prefixes) == 0 {
resp, err := container.ListBlobs(storage.ListBlobsParameters{
Prefix: prefix,
Marker: marker,
Delimiter: delimiter,
MaxResults: uint(maxKeys),
})
if err != nil {
return result, azureToObjectError(errors.Trace(err), bucket, prefix)
}
for _, object := range resp.Blobs {
if strings.HasPrefix(object.Name, minio.GatewayMinioSysTmp) {
continue
}
objects = append(objects, minio.ObjectInfo{
Bucket: bucket,
Name: object.Name,
ModTime: time.Time(object.Properties.LastModified),
Size: object.Properties.ContentLength,
ETag: minio.ToS3ETag(object.Properties.Etag),
ContentType: object.Properties.ContentType,
ContentEncoding: object.Properties.ContentEncoding,
})
}
// Remove minio.sys.tmp prefix.
for _, prefix := range resp.BlobPrefixes {
if prefix != minio.GatewayMinioSysTmp {
prefixes = append(prefixes, prefix)
}
}
marker = resp.NextMarker
if resp.NextMarker == "" {
break
}
}
result.Objects = objects
result.Prefixes = prefixes
result.NextMarker = marker
result.IsTruncated = (marker != "")
return result, nil
}
// ListObjectsV2 - list all blobs in Azure bucket filtered by prefix
func (a *azureObjects) ListObjectsV2(ctx context.Context, bucket, prefix, continuationToken, delimiter string, maxKeys int, fetchOwner bool, startAfter string) (result minio.ListObjectsV2Info, err error) {
marker := continuationToken
if startAfter != "" {
marker = startAfter
}
var resultV1 minio.ListObjectsInfo
resultV1, err = a.ListObjects(ctx, bucket, prefix, marker, delimiter, maxKeys)
if err != nil {
return result, err
}
result.Objects = resultV1.Objects
result.Prefixes = resultV1.Prefixes
result.ContinuationToken = continuationToken
result.NextContinuationToken = resultV1.NextMarker
result.IsTruncated = (resultV1.NextMarker != "")
return result, nil
}
// GetObject - reads an object from azure. Supports additional
// parameters like offset and length which are synonymous with
// HTTP Range requests.
//
// startOffset indicates the starting read location of the object.
// length indicates the total length of the object.
func (a *azureObjects) GetObject(ctx context.Context, bucket, object string, startOffset int64, length int64, writer io.Writer, etag string) error {
// startOffset cannot be negative.
if startOffset < 0 {
return azureToObjectError(errors.Trace(minio.InvalidRange{}), bucket, object)
}
blobRange := &storage.BlobRange{Start: uint64(startOffset)}
if length > 0 {
blobRange.End = uint64(startOffset + length - 1)
}
blob := a.client.GetContainerReference(bucket).GetBlobReference(object)
var rc io.ReadCloser
var err error
if startOffset == 0 && length == 0 {
rc, err = blob.Get(nil)
} else {
rc, err = blob.GetRange(&storage.GetBlobRangeOptions{
Range: blobRange,
})
}
if err != nil {
return azureToObjectError(errors.Trace(err), bucket, object)
}
_, err = io.Copy(writer, rc)
rc.Close()
return errors.Trace(err)
}
// GetObjectInfo - reads blob metadata properties and replies back minio.ObjectInfo,
// uses zure equivalent GetBlobProperties.
func (a *azureObjects) GetObjectInfo(ctx context.Context, bucket, object string) (objInfo minio.ObjectInfo, err error) {
blob := a.client.GetContainerReference(bucket).GetBlobReference(object)
err = blob.GetProperties(nil)
if err != nil {
return objInfo, azureToObjectError(errors.Trace(err), bucket, object)
}
return minio.ObjectInfo{
Bucket: bucket,
UserDefined: azurePropertiesToS3Meta(blob.Metadata, blob.Properties),
ETag: minio.ToS3ETag(blob.Properties.Etag),
ModTime: time.Time(blob.Properties.LastModified),
Name: object,
Size: blob.Properties.ContentLength,
ContentType: blob.Properties.ContentType,
ContentEncoding: blob.Properties.ContentEncoding,
}, nil
}
// PutObject - Create a new blob with the incoming data,
// uses Azure equivalent CreateBlockBlobFromReader.
func (a *azureObjects) PutObject(ctx context.Context, bucket, object string, data *hash.Reader, metadata map[string]string) (objInfo minio.ObjectInfo, err error) {
blob := a.client.GetContainerReference(bucket).GetBlobReference(object)
blob.Metadata, blob.Properties, err = s3MetaToAzureProperties(metadata)
if err != nil {
return objInfo, azureToObjectError(err, bucket, object)
}
err = blob.CreateBlockBlobFromReader(data, nil)
if err != nil {
return objInfo, azureToObjectError(errors.Trace(err), bucket, object)
}
return a.GetObjectInfo(ctx, bucket, object)
}
// CopyObject - Copies a blob from source container to destination container.
// Uses Azure equivalent CopyBlob API.
func (a *azureObjects) CopyObject(ctx context.Context, srcBucket, srcObject, destBucket, destObject string, srcInfo minio.ObjectInfo) (objInfo minio.ObjectInfo, err error) {
srcBlobURL := a.client.GetContainerReference(srcBucket).GetBlobReference(srcObject).GetURL()
destBlob := a.client.GetContainerReference(destBucket).GetBlobReference(destObject)
azureMeta, props, err := s3MetaToAzureProperties(srcInfo.UserDefined)
if err != nil {
return objInfo, azureToObjectError(err, srcBucket, srcObject)
}
destBlob.Metadata = azureMeta
err = destBlob.Copy(srcBlobURL, nil)
if err != nil {
return objInfo, azureToObjectError(errors.Trace(err), srcBucket, srcObject)
}
destBlob.Properties = props
err = destBlob.SetProperties(nil)
if err != nil {
return objInfo, azureToObjectError(errors.Trace(err), srcBucket, srcObject)
}
return a.GetObjectInfo(ctx, destBucket, destObject)
}
// DeleteObject - Deletes a blob on azure container, uses Azure
// equivalent DeleteBlob API.
func (a *azureObjects) DeleteObject(ctx context.Context, bucket, object string) error {
blob := a.client.GetContainerReference(bucket).GetBlobReference(object)
err := blob.Delete(nil)
if err != nil {
return azureToObjectError(errors.Trace(err), bucket, object)
}
return nil
}
// ListMultipartUploads - It's decided not to support List Multipart Uploads, hence returning empty result.
func (a *azureObjects) ListMultipartUploads(ctx context.Context, bucket, prefix, keyMarker, uploadIDMarker, delimiter string, maxUploads int) (result minio.ListMultipartsInfo, err error) {
// It's decided not to support List Multipart Uploads, hence returning empty result.
return result, nil
}
type azureMultipartMetadata struct {
Name string `json:"name"`
Metadata map[string]string `json:"metadata"`
}
func getAzureMetadataObjectName(objectName, uploadID string) string {
return fmt.Sprintf(metadataObjectNameTemplate, uploadID, sha256.Sum256([]byte(objectName)))
}
func (a *azureObjects) checkUploadIDExists(bucketName, objectName, uploadID string) (err error) {
blob := a.client.GetContainerReference(bucketName).GetBlobReference(
getAzureMetadataObjectName(objectName, uploadID))
err = blob.GetMetadata(nil)
err = azureToObjectError(errors.Trace(err), bucketName, objectName)
oerr := minio.ObjectNotFound{
Bucket: bucketName,
Object: objectName,
}
if errors.Cause(err) == oerr {
err = errors.Trace(minio.InvalidUploadID{
UploadID: uploadID,
})
}
return err
}
// NewMultipartUpload - Use Azure equivalent CreateBlockBlob.
func (a *azureObjects) NewMultipartUpload(ctx context.Context, bucket, object string, metadata map[string]string) (uploadID string, err error) {
uploadID = mustGetAzureUploadID()
metadataObject := getAzureMetadataObjectName(object, uploadID)
var jsonData []byte
if jsonData, err = json.Marshal(azureMultipartMetadata{Name: object, Metadata: metadata}); err != nil {
return "", errors.Trace(err)
}
blob := a.client.GetContainerReference(bucket).GetBlobReference(metadataObject)
err = blob.CreateBlockBlobFromReader(bytes.NewBuffer(jsonData), nil)
if err != nil {
return "", azureToObjectError(errors.Trace(err), bucket, metadataObject)
}
return uploadID, nil
}
// PutObjectPart - Use Azure equivalent PutBlockWithLength.
func (a *azureObjects) PutObjectPart(ctx context.Context, bucket, object, uploadID string, partID int, data *hash.Reader) (info minio.PartInfo, err error) {
if err = a.checkUploadIDExists(bucket, object, uploadID); err != nil {
return info, err
}
if err = checkAzureUploadID(uploadID); err != nil {
return info, err
}
etag := data.MD5HexString()
if etag == "" {
etag = minio.GenETag()
}
subPartSize, subPartNumber := int64(azureBlockSize), 1
for remainingSize := data.Size(); remainingSize >= 0; remainingSize -= subPartSize {
// Allow to create zero sized part.
if remainingSize == 0 && subPartNumber > 1 {
break
}
if remainingSize < subPartSize {
subPartSize = remainingSize
}
id := azureGetBlockID(partID, subPartNumber, uploadID, etag)
blob := a.client.GetContainerReference(bucket).GetBlobReference(object)
err = blob.PutBlockWithLength(id, uint64(subPartSize), io.LimitReader(data, subPartSize), nil)
if err != nil {
return info, azureToObjectError(errors.Trace(err), bucket, object)
}
subPartNumber++
}
info.PartNumber = partID
info.ETag = etag
info.LastModified = minio.UTCNow()
info.Size = data.Size()
return info, nil
}
// ListObjectParts - Use Azure equivalent GetBlockList.
func (a *azureObjects) ListObjectParts(ctx context.Context, bucket, object, uploadID string, partNumberMarker int, maxParts int) (result minio.ListPartsInfo, err error) {
if err = a.checkUploadIDExists(bucket, object, uploadID); err != nil {
return result, err
}
result.Bucket = bucket
result.Object = object
result.UploadID = uploadID
result.MaxParts = maxParts
objBlob := a.client.GetContainerReference(bucket).GetBlobReference(object)
resp, err := objBlob.GetBlockList(storage.BlockListTypeUncommitted, nil)
azureErr, ok := err.(storage.AzureStorageServiceError)
if ok && azureErr.StatusCode == http.StatusNotFound {
// If no parts are uploaded yet then we return empty list.
return result, nil
}
if err != nil {
return result, azureToObjectError(errors.Trace(err), bucket, object)
}
// Build a sorted list of parts and return the requested entries.
partsMap := make(map[int]minio.PartInfo)
for _, block := range resp.UncommittedBlocks {
var partNumber int
var parsedUploadID string
var md5Hex string
if partNumber, _, parsedUploadID, md5Hex, err = azureParseBlockID(block.Name); err != nil {
return result, azureToObjectError(errors.Trace(fmt.Errorf("Unexpected error")), bucket, object)
}
if parsedUploadID != uploadID {
continue
}
part, ok := partsMap[partNumber]
if !ok {
partsMap[partNumber] = minio.PartInfo{
PartNumber: partNumber,
Size: block.Size,
ETag: md5Hex,
}
continue
}
if part.ETag != md5Hex {
// If two parts of same partNumber were uploaded with different contents
// return error as we won't be able to decide which the latest part is.
return result, azureToObjectError(errors.Trace(fmt.Errorf("Unexpected error")), bucket, object)
}
part.Size += block.Size
partsMap[partNumber] = part
}
var parts []minio.PartInfo
for _, part := range partsMap {
parts = append(parts, part)
}
sort.Slice(parts, func(i int, j int) bool {
return parts[i].PartNumber < parts[j].PartNumber
})
partsCount := 0
i := 0
if partNumberMarker != 0 {
// If the marker was set, skip the entries till the marker.
for _, part := range parts {
i++
if part.PartNumber == partNumberMarker {
break
}
}
}
for partsCount < maxParts && i < len(parts) {
result.Parts = append(result.Parts, parts[i])
i++
partsCount++
}
if i < len(parts) {
result.IsTruncated = true
if partsCount != 0 {
result.NextPartNumberMarker = result.Parts[partsCount-1].PartNumber
}
}
result.PartNumberMarker = partNumberMarker
return result, nil
}
// AbortMultipartUpload - Not Implemented.
// There is no corresponding API in azure to abort an incomplete upload. The uncommmitted blocks
// gets deleted after one week.
func (a *azureObjects) AbortMultipartUpload(ctx context.Context, bucket, object, uploadID string) (err error) {
if err = a.checkUploadIDExists(bucket, object, uploadID); err != nil {
return err
}
blob := a.client.GetContainerReference(bucket).GetBlobReference(
getAzureMetadataObjectName(object, uploadID))
return blob.Delete(nil)
}
// CompleteMultipartUpload - Use Azure equivalent PutBlockList.
func (a *azureObjects) CompleteMultipartUpload(ctx context.Context, bucket, object, uploadID string, uploadedParts []minio.CompletePart) (objInfo minio.ObjectInfo, err error) {
metadataObject := getAzureMetadataObjectName(object, uploadID)
if err = a.checkUploadIDExists(bucket, object, uploadID); err != nil {
return objInfo, err
}
if err = checkAzureUploadID(uploadID); err != nil {
return objInfo, err
}
var metadataReader io.Reader
blob := a.client.GetContainerReference(bucket).GetBlobReference(metadataObject)
if metadataReader, err = blob.Get(nil); err != nil {
return objInfo, azureToObjectError(errors.Trace(err), bucket, metadataObject)
}
var metadata azureMultipartMetadata
if err = json.NewDecoder(metadataReader).Decode(&metadata); err != nil {
return objInfo, azureToObjectError(errors.Trace(err), bucket, metadataObject)
}
defer func() {
if err != nil {
return
}
blob := a.client.GetContainerReference(bucket).GetBlobReference(metadataObject)
derr := blob.Delete(nil)
minio.ErrorIf(derr, "unable to remove meta data object for upload ID %s", uploadID)
}()
objBlob := a.client.GetContainerReference(bucket).GetBlobReference(object)
resp, err := objBlob.GetBlockList(storage.BlockListTypeUncommitted, nil)
if err != nil {
return objInfo, azureToObjectError(errors.Trace(err), bucket, object)
}
getBlocks := func(partNumber int, etag string) (blocks []storage.Block, size int64, err error) {
for _, part := range resp.UncommittedBlocks {
var partID int
var readUploadID string
var md5Hex string
if partID, _, readUploadID, md5Hex, err = azureParseBlockID(part.Name); err != nil {
return nil, 0, err
}
if partNumber == partID && uploadID == readUploadID && etag == md5Hex {
blocks = append(blocks, storage.Block{
ID: part.Name,
Status: storage.BlockStatusUncommitted,
})
size += part.Size
}
}
if len(blocks) == 0 {
return nil, 0, minio.InvalidPart{}
}
return blocks, size, nil
}
var allBlocks []storage.Block
partSizes := make([]int64, len(uploadedParts))
for i, part := range uploadedParts {
var blocks []storage.Block
var size int64
blocks, size, err = getBlocks(part.PartNumber, part.ETag)
if err != nil {
return objInfo, errors.Trace(err)
}
allBlocks = append(allBlocks, blocks...)
partSizes[i] = size
}
// Error out if parts except last part sizing < 5MiB.
for i, size := range partSizes[:len(partSizes)-1] {
if size < azureS3MinPartSize {
return objInfo, errors.Trace(minio.PartTooSmall{
PartNumber: uploadedParts[i].PartNumber,
PartSize: size,
PartETag: uploadedParts[i].ETag,
})
}
}
err = objBlob.PutBlockList(allBlocks, nil)
if err != nil {
return objInfo, azureToObjectError(errors.Trace(err), bucket, object)
}
if len(metadata.Metadata) > 0 {
objBlob.Metadata, objBlob.Properties, err = s3MetaToAzureProperties(metadata.Metadata)
if err != nil {
return objInfo, azureToObjectError(err, bucket, object)
}
err = objBlob.SetProperties(nil)
if err != nil {
return objInfo, azureToObjectError(errors.Trace(err), bucket, object)
}
err = objBlob.SetMetadata(nil)
if err != nil {
return objInfo, azureToObjectError(errors.Trace(err), bucket, object)
}
}
return a.GetObjectInfo(ctx, bucket, object)
}
// SetBucketPolicy - Azure supports three types of container policies:
// storage.ContainerAccessTypeContainer - readonly in minio terminology
// storage.ContainerAccessTypeBlob - readonly without listing in minio terminology
// storage.ContainerAccessTypePrivate - none in minio terminology
// As the common denominator for minio and azure is readonly and none, we support
// these two policies at the bucket level.
func (a *azureObjects) SetBucketPolicy(ctx context.Context, bucket string, policyInfo policy.BucketAccessPolicy) error {
var policies []minio.BucketAccessPolicy
for prefix, policy := range policy.GetPolicies(policyInfo.Statements, bucket, "") {
policies = append(policies, minio.BucketAccessPolicy{
Prefix: prefix,
Policy: policy,
})
}
prefix := bucket + "/*" // For all objects inside the bucket.
if len(policies) != 1 {
return errors.Trace(minio.NotImplemented{})
}
if policies[0].Prefix != prefix {
return errors.Trace(minio.NotImplemented{})
}
if policies[0].Policy != policy.BucketPolicyReadOnly {