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Added a support of the azure blob storage
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,184 @@ | ||
| package skbn | ||
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| import ( | ||
| "bytes" | ||
| "context" | ||
| "fmt" | ||
| "log" | ||
| "net/url" | ||
| "os" | ||
| "path/filepath" | ||
| "strings" | ||
|
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||
| "github.com/Azure/azure-pipeline-go/pipeline" | ||
| "github.com/Azure/azure-storage-blob-go/azblob" | ||
| ) | ||
|
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| var err error | ||
|
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| func validateAbsPath(pathSplit []string) error { | ||
| if len(pathSplit) >= 1 { | ||
| return nil | ||
| } | ||
| return fmt.Errorf("illegal path: %s", filepath.Join(pathSplit...)) | ||
| } | ||
|
|
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| func initAbsVariables(split []string) (string, string, string) { | ||
| account := split[0] | ||
| container := split[1] | ||
| path := filepath.Join(split[2:]...) | ||
|
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| return account, container, path | ||
| } | ||
|
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| func getNewPipeline() (pipeline.Pipeline, error) { | ||
| accountName, accountKey := os.Getenv("AZURE_STORAGE_ACCOUNT"), os.Getenv("AZURE_STORAGE_ACCESS_KEY") | ||
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| if len(accountName) == 0 || len(accountKey) == 0 { | ||
| log.Fatal("Either the AZURE_STORAGE_ACCOUNT or AZURE_STORAGE_ACCESS_KEY environment variable is not set") | ||
| } | ||
|
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| credential, err := azblob.NewSharedKeyCredential(accountName, accountKey) | ||
|
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| if err != nil { | ||
| log.Fatal("Invalid credentials with error: " + err.Error()) | ||
| } | ||
| pl := azblob.NewPipeline(credential, azblob.PipelineOptions{}) | ||
|
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| return pl, err | ||
| } | ||
|
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| func getServiceURL(pl pipeline.Pipeline, accountName string) (azblob.ServiceURL, error) { | ||
| URL, err := url.Parse( | ||
| fmt.Sprintf("https://%s.blob.core.windows.net/", accountName)) | ||
|
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| surl := azblob.NewServiceURL(*URL, pl) | ||
| return surl, err | ||
| } | ||
|
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| func getContainerURL(pl pipeline.Pipeline, accountName string, containerName string) (azblob.ContainerURL, error) { | ||
| URL, err := url.Parse( | ||
| fmt.Sprintf("https://%s.blob.core.windows.net/%s", accountName, containerName)) | ||
|
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| curl := azblob.NewContainerURL(*URL, pl) | ||
| return curl, err | ||
| } | ||
|
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| func getBlobURL(curl azblob.ContainerURL, blob string) (azblob.BlockBlobURL, error) { | ||
| return curl.NewBlockBlobURL(blob), err | ||
| } | ||
|
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| func createContainer(ctx context.Context, pl pipeline.Pipeline, curl azblob.ContainerURL) (*azblob.ContainerCreateResponse, error) { | ||
| cr, err := curl.Create(ctx, azblob.Metadata{}, azblob.PublicAccessNone) | ||
| return cr, err | ||
| } | ||
|
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| func listContainers(ctx context.Context, surl azblob.ServiceURL) ([]azblob.ContainerItem, error) { | ||
| lc, err := surl.ListContainersSegment(ctx, azblob.Marker{}, azblob.ListContainersSegmentOptions{}) | ||
| return lc.ContainerItems, err | ||
| } | ||
|
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| func containerExists(list []azblob.ContainerItem, containerName string) bool { | ||
| exists := false | ||
| for _, v := range list { | ||
| if containerName == v.Name { | ||
| exists = true | ||
| } | ||
| } | ||
| return exists | ||
| } | ||
|
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| // GetClientToAbs checks the connection to azure blob storage and returns the tested client (pipeline) | ||
| func GetClientToAbs(ctx context.Context, path string) (pipeline.Pipeline, error) { | ||
| pSplit := strings.Split(path, "/") | ||
| a, c, _ := initAbsVariables(pSplit) | ||
| pl, err := getNewPipeline() | ||
| su, err := getServiceURL(pl, a) | ||
| lc, err := listContainers(ctx, su) | ||
| cu, err := getContainerURL(pl, a, c) | ||
|
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| if !containerExists(lc, c) { | ||
| _, err := createContainer(ctx, pl, cu) | ||
|
|
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| if err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
|
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| return pl, err | ||
| } | ||
|
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| // GetListOfFilesFromAbs gets list of files in path from azure blob storage (recursive) | ||
| func GetListOfFilesFromAbs(ctx context.Context, iClient interface{}, path string) ([]string, error) { | ||
| pSplit := strings.Split(path, "/") | ||
|
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| if err := validateAbsPath(pSplit); err != nil { | ||
| return nil, err | ||
| } | ||
|
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| a, c, p := initAbsVariables(pSplit) | ||
| pl := iClient.(pipeline.Pipeline) | ||
| cu, err := getContainerURL(pl, a, c) | ||
| bl := []string{} | ||
|
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| for marker := (azblob.Marker{}); marker.NotDone(); { | ||
| listBlob, err := cu.ListBlobsFlatSegment(ctx, marker, azblob.ListBlobsSegmentOptions{}) | ||
|
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| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| marker = listBlob.NextMarker | ||
|
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| for _, blobInfo := range listBlob.Segment.BlobItems { | ||
| bl = append(bl, strings.Replace(blobInfo.Name, p, "", 1)) | ||
| } | ||
| } | ||
|
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| return bl, err | ||
| } | ||
|
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| // DownloadFromAbs downloads a single file from azure blob storage | ||
| func DownloadFromAbs(ctx context.Context, iClient interface{}, path string) ([]byte, error) { | ||
| pSplit := strings.Split(path, "/") | ||
|
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| if err := validateAbsPath(pSplit); err != nil { | ||
| return nil, err | ||
| } | ||
|
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| a, c, p := initAbsVariables(pSplit) | ||
| pl := iClient.(pipeline.Pipeline) | ||
| cu, err := getContainerURL(pl, a, c) | ||
| bu, err := getBlobURL(cu, p) | ||
| dr, err := bu.Download(ctx, 0, azblob.CountToEnd, azblob.BlobAccessConditions{}, false) | ||
| bs := dr.Body(azblob.RetryReaderOptions{MaxRetryRequests: 20}) | ||
| dd := bytes.Buffer{} | ||
| _, err = dd.ReadFrom(bs) | ||
|
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| return dd.Bytes(), err | ||
| } | ||
|
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| // UploadToAbs uploads a single file to azure blob storage | ||
| func UploadToAbs(ctx context.Context, iClient interface{}, toPath, fromPath string, buffer []byte) error { | ||
| pSplit := strings.Split(toPath, "/") | ||
|
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| if err := validateAbsPath(pSplit); err != nil { | ||
| return err | ||
| } | ||
|
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| if len(pSplit) == 1 { | ||
| _, fn := filepath.Split(fromPath) | ||
| pSplit = append(pSplit, fn) | ||
| } | ||
|
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| a, c, p := initAbsVariables(pSplit) | ||
| pl := iClient.(pipeline.Pipeline) | ||
| cu, err := getContainerURL(pl, a, c) | ||
| bu, err := getBlobURL(cu, p) | ||
|
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| _, err = azblob.UploadBufferToBlockBlob(ctx, buffer, bu, azblob.UploadToBlockBlobOptions{ | ||
| BlockSize: 4 * 1024 * 1024, | ||
| Parallelism: 16}) | ||
|
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||
| return err | ||
| } |
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