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azureBlobStoragemanager.go
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azureBlobStoragemanager.go
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package filemanager
import (
"bytes"
"context"
"errors"
"fmt"
"net/url"
"os"
"path"
"strings"
"time"
"github.com/Azure/azure-storage-blob-go/azblob"
)
func suppressMinorErrors(err error) error {
if err != nil {
if storageError, ok := err.(azblob.StorageError); ok { // This error is a Service-specific
switch storageError.ServiceCode() { // Compare serviceCode to ServiceCodeXxx constants
case azblob.ServiceCodeContainerAlreadyExists:
pkgLogger.Debug("Received 409. Container already exists")
return nil
}
}
}
return err
}
func (manager *AzureBlobStorageManager) getBaseURL() *url.URL {
protocol := "https"
if manager.Config.DisableSSL != nil && *manager.Config.DisableSSL {
protocol = "http"
}
endpoint := "blob.core.windows.net"
if manager.Config.EndPoint != nil && *manager.Config.EndPoint != "" {
endpoint = *manager.Config.EndPoint
}
baseURL := url.URL{
Scheme: protocol,
Host: fmt.Sprintf("%s.%s", manager.Config.AccountName, endpoint),
}
if manager.Config.UseSASTokens {
baseURL.RawQuery = manager.Config.SASToken
}
if manager.Config.ForcePathStyle != nil && *manager.Config.ForcePathStyle {
baseURL.Host = endpoint
baseURL.Path = fmt.Sprintf("/%s/", manager.Config.AccountName)
}
return &baseURL
}
func (manager *AzureBlobStorageManager) getContainerURL() (azblob.ContainerURL, error) {
if manager.Config.Container == "" {
return azblob.ContainerURL{}, errors.New("no container configured")
}
credential, err := manager.getCredentials()
if err != nil {
return azblob.ContainerURL{}, err
}
p := azblob.NewPipeline(credential, azblob.PipelineOptions{})
// From the Azure portal, get your storage account blob service URL endpoint.
baseURL := manager.getBaseURL()
serviceURL := azblob.NewServiceURL(*baseURL, p)
containerURL := serviceURL.NewContainerURL(manager.Config.Container)
return containerURL, nil
}
func (manager *AzureBlobStorageManager) getCredentials() (azblob.Credential, error) {
if manager.Config.UseSASTokens {
return azblob.NewAnonymousCredential(), nil
}
accountName, accountKey := manager.Config.AccountName, manager.Config.AccountKey
if accountName == "" || accountKey == "" {
return nil, errors.New("either accountName or accountKey is empty")
}
// Create a default request pipeline using your storage account name and account key.
return azblob.NewSharedKeyCredential(accountName, accountKey)
}
// Upload passed in file to Azure Blob Storage
func (manager *AzureBlobStorageManager) Upload(ctx context.Context, file *os.File, prefixes ...string) (UploadOutput, error) {
containerURL, err := manager.getContainerURL()
if err != nil {
return UploadOutput{}, err
}
ctx, cancel := context.WithTimeout(ctx, manager.getTimeout())
defer cancel()
if manager.createContainer() {
_, err = containerURL.Create(ctx, azblob.Metadata{}, azblob.PublicAccessNone)
err = suppressMinorErrors(err)
if err != nil {
return UploadOutput{}, err
}
}
fileName := path.Join(manager.Config.Prefix, path.Join(prefixes...), path.Base(file.Name()))
// Here's how to upload a blob.
blobURL := containerURL.NewBlockBlobURL(fileName)
_, err = azblob.UploadFileToBlockBlob(ctx, file, blobURL, azblob.UploadToBlockBlobOptions{
BlockSize: 4 * 1024 * 1024,
Parallelism: 16,
})
if err != nil {
return UploadOutput{}, err
}
return UploadOutput{Location: manager.blobLocation(&blobURL), ObjectName: fileName}, nil
}
func (manager *AzureBlobStorageManager) createContainer() bool {
return !manager.Config.UseSASTokens
}
func (manager *AzureBlobStorageManager) blobLocation(blobURL *azblob.BlockBlobURL) string {
if !manager.Config.UseSASTokens {
return blobURL.String()
}
// Reset SAS Query parameters
blobURLParts := azblob.NewBlobURLParts(blobURL.URL())
blobURLParts.SAS = azblob.SASQueryParameters{}
newBlobURL := blobURLParts.URL()
return newBlobURL.String()
}
func (manager *AzureBlobStorageManager) ListFilesWithPrefix(ctx context.Context, startAfter, prefix string, maxItems int64) (fileObjects []*FileObject, err error) {
containerURL, err := manager.getContainerURL()
if err != nil {
return []*FileObject{}, err
}
blobListingDetails := azblob.BlobListingDetails{
Metadata: true,
}
segmentOptions := azblob.ListBlobsSegmentOptions{
Details: blobListingDetails,
Prefix: prefix,
MaxResults: int32(maxItems),
}
ctx, cancel := context.WithTimeout(ctx, manager.getTimeout())
defer cancel()
// List the blobs in the container
var response *azblob.ListBlobsFlatSegmentResponse
// Checking if maxItems > 0 to avoid function calls which expect only maxItems to be returned and not more in the code
for maxItems > 0 && manager.Config.Marker.NotDone() {
response, err = containerURL.ListBlobsFlatSegment(ctx, manager.Config.Marker, segmentOptions)
if err != nil {
return
}
manager.Config.Marker = response.NextMarker
fileObjects = make([]*FileObject, 0)
for idx := range response.Segment.BlobItems {
if strings.Compare(response.Segment.BlobItems[idx].Name, startAfter) > 0 {
fileObjects = append(fileObjects, &FileObject{response.Segment.BlobItems[idx].Name, response.Segment.BlobItems[idx].Properties.LastModified})
maxItems--
}
}
}
return
}
func (manager *AzureBlobStorageManager) Download(ctx context.Context, output *os.File, key string) error {
containerURL, err := manager.getContainerURL()
if err != nil {
return err
}
blobURL := containerURL.NewBlockBlobURL(key)
ctx, cancel := context.WithTimeout(ctx, manager.getTimeout())
defer cancel()
// Here's how to download the blob
downloadResponse, err := blobURL.Download(ctx, 0, azblob.CountToEnd, azblob.BlobAccessConditions{}, false, azblob.ClientProvidedKeyOptions{})
if err != nil {
return err
}
// NOTE: automatically retries are performed if the connection fails
bodyStream := downloadResponse.Body(azblob.RetryReaderOptions{MaxRetryRequests: 20})
// read the body into a buffer
downloadedData := bytes.Buffer{}
_, err = downloadedData.ReadFrom(bodyStream)
if err != nil {
return err
}
_, err = output.Write(downloadedData.Bytes())
return err
}
/*
GetObjectNameFromLocation gets the object name/key name from the object location url
https://account-name.blob.core.windows.net/container-name/key - >> key
*/
func (manager *AzureBlobStorageManager) GetObjectNameFromLocation(location string) (string, error) {
strToken := strings.Split(location, fmt.Sprintf("%s/", manager.Config.Container))
return strToken[len(strToken)-1], nil
}
func (manager *AzureBlobStorageManager) GetDownloadKeyFromFileLocation(location string) string {
str := strings.Split(location, fmt.Sprintf("%s/", manager.Config.Container))
return str[len(str)-1]
}
type AzureBlobStorageManager struct {
Config *AzureBlobStorageConfig
timeout time.Duration
}
func (manager *AzureBlobStorageManager) SetTimeout(timeout time.Duration) {
manager.timeout = timeout
}
func (manager *AzureBlobStorageManager) getTimeout() time.Duration {
if manager.timeout > 0 {
return manager.timeout
}
return getBatchRouterTimeoutConfig("AZURE_BLOB")
}
func GetAzureBlogStorageConfig(config map[string]interface{}) *AzureBlobStorageConfig {
var containerName, accountName, accountKey, sasToken, prefix string
var endPoint *string
var marker azblob.Marker
var forcePathStyle, disableSSL *bool
var useSASTokens bool
if config["containerName"] != nil {
tmp, ok := config["containerName"].(string)
if ok {
containerName = tmp
}
}
if config["prefix"] != nil {
tmp, ok := config["prefix"].(string)
if ok {
prefix = tmp
}
}
if config["accountName"] != nil {
tmp, ok := config["accountName"].(string)
if ok {
accountName = tmp
}
}
if config["useSASTokens"] != nil {
tmp, ok := config["useSASTokens"].(bool)
if ok {
useSASTokens = tmp
}
}
if config["sasToken"] != nil {
tmp, ok := config["sasToken"].(string)
if ok {
sasToken = strings.TrimPrefix(tmp, "?")
}
}
if config["accountKey"] != nil {
tmp, ok := config["accountKey"].(string)
if ok {
accountKey = tmp
}
}
if config["endPoint"] != nil {
tmp, ok := config["endPoint"].(string)
if ok {
endPoint = &tmp
}
}
if config["forcePathStyle"] != nil {
tmp, ok := config["forcePathStyle"].(bool)
if ok {
forcePathStyle = &tmp
}
}
if config["disableSSL"] != nil {
tmp, ok := config["disableSSL"].(bool)
if ok {
disableSSL = &tmp
}
}
return &AzureBlobStorageConfig{
Container: containerName,
Prefix: prefix,
AccountName: accountName,
AccountKey: accountKey,
UseSASTokens: useSASTokens,
SASToken: sasToken,
EndPoint: endPoint,
ForcePathStyle: forcePathStyle,
DisableSSL: disableSSL,
Marker: marker,
}
}
type AzureBlobStorageConfig struct {
Container string
Prefix string
AccountName string
AccountKey string
SASToken string
EndPoint *string
ForcePathStyle *bool
DisableSSL *bool
Marker azblob.Marker
UseSASTokens bool
}
func (manager *AzureBlobStorageManager) DeleteObjects(ctx context.Context, keys []string) (err error) {
containerURL, err := manager.getContainerURL()
if err != nil {
return err
}
for _, key := range keys {
blobURL := containerURL.NewBlockBlobURL(key)
_ctx, cancel := context.WithTimeout(ctx, manager.getTimeout())
_, err := blobURL.Delete(_ctx, azblob.DeleteSnapshotsOptionNone, azblob.BlobAccessConditions{})
if err != nil {
cancel()
return err
}
cancel()
}
return
}
func (manager *AzureBlobStorageManager) GetConfiguredPrefix() string {
return manager.Config.Prefix
}