forked from benthosdev/benthos
/
azure_blob_storage.go
183 lines (166 loc) · 5.79 KB
/
azure_blob_storage.go
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//go:build !wasm
// +build !wasm
package writer
import (
"bytes"
"context"
"errors"
"fmt"
"net/url"
"strings"
"time"
"github.com/Azure/azure-sdk-for-go/storage"
"github.com/Azure/go-autorest/autorest/azure"
"github.com/dafanshu/benthos/v3/internal/bloblang/field"
"github.com/dafanshu/benthos/v3/internal/interop"
"github.com/dafanshu/benthos/v3/lib/log"
"github.com/dafanshu/benthos/v3/lib/metrics"
"github.com/dafanshu/benthos/v3/lib/types"
)
//------------------------------------------------------------------------------
// AzureBlobStorage is a benthos writer. Type implementation that writes messages to an
// Azure Blob Storage storage account.
type AzureBlobStorage struct {
conf AzureBlobStorageConfig
container *field.Expression
path *field.Expression
blobType *field.Expression
accessLevel *field.Expression
client storage.BlobStorageClient
log log.Modular
stats metrics.Type
}
// NewAzureBlobStorage creates a new AzureBlobStorage writer.Type.
// Deprecated
func NewAzureBlobStorage(
conf AzureBlobStorageConfig,
log log.Modular,
stats metrics.Type,
) (*AzureBlobStorage, error) {
return NewAzureBlobStorageV2(types.NoopMgr(), conf, log, stats)
}
// NewAzureBlobStorageV2 creates a new AzureBlobStorage writer.Type.
func NewAzureBlobStorageV2(
mgr types.Manager,
conf AzureBlobStorageConfig,
log log.Modular,
stats metrics.Type,
) (*AzureBlobStorage, error) {
if conf.StorageAccount == "" && conf.StorageConnectionString == "" {
return nil, errors.New("invalid azure storage account credentials")
}
var client storage.Client
var err error
if len(conf.StorageConnectionString) > 0 {
if strings.Contains(conf.StorageConnectionString, "UseDevelopmentStorage=true;") {
client, err = storage.NewEmulatorClient()
} else {
client, err = storage.NewClientFromConnectionString(conf.StorageConnectionString)
}
} else if len(conf.StorageAccessKey) > 0 {
client, err = storage.NewBasicClient(conf.StorageAccount, conf.StorageAccessKey)
} else {
// The SAS token in the Azure UI is provided as an URL query string with
// the '?' prepended to it which confuses url.ParseQuery
token, err := url.ParseQuery(strings.TrimPrefix(conf.StorageSASToken, "?"))
if err != nil {
return nil, fmt.Errorf("invalid azure storage SAS token: %v", err)
}
client = storage.NewAccountSASClient(conf.StorageAccount, token, azure.PublicCloud)
}
if err != nil {
return nil, fmt.Errorf("invalid azure storage account credentials: %v", err)
}
a := &AzureBlobStorage{
conf: conf,
log: log,
stats: stats,
client: client.GetBlobService(),
}
if a.container, err = interop.NewBloblangField(mgr, conf.Container); err != nil {
return nil, fmt.Errorf("failed to parse container expression: %v", err)
}
if a.path, err = interop.NewBloblangField(mgr, conf.Path); err != nil {
return nil, fmt.Errorf("failed to parse path expression: %v", err)
}
if a.blobType, err = interop.NewBloblangField(mgr, conf.BlobType); err != nil {
return nil, fmt.Errorf("failed to parse blob type expression: %v", err)
}
if a.accessLevel, err = interop.NewBloblangField(mgr, conf.PublicAccessLevel); err != nil {
return nil, fmt.Errorf("failed to parse public access level expression: %v", err)
}
return a, nil
}
// ConnectWithContext attempts to establish a connection to the target Blob Storage Account.
func (a *AzureBlobStorage) ConnectWithContext(ctx context.Context) error {
return a.Connect()
}
// Connect attempts to establish a connection to the target Blob Storage Account.
func (a *AzureBlobStorage) Connect() error {
return nil
}
// Write attempts to write message contents to a target Azure Blob Storage container as files.
func (a *AzureBlobStorage) Write(msg types.Message) error {
return a.WriteWithContext(context.Background(), msg)
}
func (a *AzureBlobStorage) uploadBlob(b *storage.Blob, blobType string, message []byte) error {
if blobType == "APPEND" {
exists, err := b.Exists()
if err != nil {
return err
}
if !exists {
if err := b.PutAppendBlob(nil); err != nil {
return err
}
}
return b.AppendBlock(message, nil)
}
return b.CreateBlockBlobFromReader(bytes.NewReader(message), nil)
}
func (a *AzureBlobStorage) createContainer(c *storage.Container, accessLevel string) error {
opts := storage.CreateContainerOptions{}
switch accessLevel {
case "BLOB":
opts.Access = storage.ContainerAccessTypeBlob
case "CONTAINER":
opts.Access = storage.ContainerAccessTypeContainer
}
return c.Create(&opts)
}
// WriteWithContext attempts to write message contents to a target storage account as files.
func (a *AzureBlobStorage) WriteWithContext(_ context.Context, msg types.Message) error {
return IterateBatchedSend(msg, func(i int, p types.Part) error {
c := a.client.GetContainerReference(a.container.String(i, msg))
b := c.GetBlobReference(a.path.String(i, msg))
if err := a.uploadBlob(b, a.blobType.String(i, msg), p.Get()); err != nil {
if containerNotFound(err) {
if cerr := a.createContainer(c, a.accessLevel.String(i, msg)); cerr != nil {
a.log.Debugf("error creating container: %v.", cerr)
return cerr
}
err = a.uploadBlob(b, a.blobType.String(i, msg), p.Get())
if err != nil {
a.log.Debugf("error retrying to upload blob: %v.", err)
}
}
return err
}
return nil
})
}
func containerNotFound(err error) bool {
if serr, ok := err.(storage.AzureStorageServiceError); ok {
return serr.Code == "ContainerNotFound"
}
return false
}
// CloseAsync begins cleaning up resources used by this reader asynchronously.
func (a *AzureBlobStorage) CloseAsync() {
}
// WaitForClose will block until either the reader is closed or a specified
// timeout occurs.
func (a *AzureBlobStorage) WaitForClose(time.Duration) error {
return nil
}
//------------------------------------------------------------------------------