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azure.go
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azure.go
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package azure
import (
"context"
"encoding/base64"
"fmt"
"io/ioutil"
"os"
"sort"
"strconv"
"strings"
"time"
storage "github.com/Azure/azure-sdk-for-go/storage"
"github.com/Azure/go-autorest/autorest/azure"
metrics "github.com/armon/go-metrics"
"github.com/hashicorp/errwrap"
cleanhttp "github.com/hashicorp/go-cleanhttp"
log "github.com/hashicorp/go-hclog"
"github.com/hashicorp/vault/sdk/helper/strutil"
"github.com/hashicorp/vault/sdk/physical"
)
const (
// MaxBlobSize at this time
MaxBlobSize = 1024 * 1024 * 4
// MaxListResults is the current default value, setting explicitly
MaxListResults = 5000
)
// AzureBackend is a physical backend that stores data
// within an Azure blob container.
type AzureBackend struct {
container *storage.Container
logger log.Logger
permitPool *physical.PermitPool
}
// Verify AzureBackend satisfies the correct interfaces
var _ physical.Backend = (*AzureBackend)(nil)
// NewAzureBackend constructs an Azure backend using a pre-existing
// bucket. Credentials can be provided to the backend, sourced
// from the environment, AWS credential files or by IAM role.
func NewAzureBackend(conf map[string]string, logger log.Logger) (physical.Backend, error) {
name := os.Getenv("AZURE_BLOB_CONTAINER")
if name == "" {
name = conf["container"]
if name == "" {
return nil, fmt.Errorf("'container' must be set")
}
}
accountName := os.Getenv("AZURE_ACCOUNT_NAME")
if accountName == "" {
accountName = conf["accountName"]
if accountName == "" {
return nil, fmt.Errorf("'accountName' must be set")
}
}
accountKey := os.Getenv("AZURE_ACCOUNT_KEY")
if accountKey == "" {
accountKey = conf["accountKey"]
if accountKey == "" {
return nil, fmt.Errorf("'accountKey' must be set")
}
}
environmentName := os.Getenv("AZURE_ENVIRONMENT")
if environmentName == "" {
environmentName = conf["environment"]
if environmentName == "" {
environmentName = "AzurePublicCloud"
}
}
environmentUrl := os.Getenv("AZURE_ARM_ENDPOINT")
if environmentUrl == "" {
environmentUrl = conf["arm_endpoint"]
}
var environment azure.Environment
var err error
if environmentUrl != "" {
environment, err = azure.EnvironmentFromURL(environmentUrl)
if err != nil {
errorMsg := fmt.Sprintf("failed to look up Azure environment descriptor for URL %q: {{err}}",
environmentUrl)
return nil, errwrap.Wrapf(errorMsg, err)
}
} else {
environment, err = azure.EnvironmentFromName(environmentName)
if err != nil {
errorMsg := fmt.Sprintf("failed to look up Azure environment descriptor for name %q: {{err}}",
environmentName)
return nil, errwrap.Wrapf(errorMsg, err)
}
}
client, err := storage.NewBasicClientOnSovereignCloud(accountName, accountKey, environment)
if err != nil {
return nil, errwrap.Wrapf("failed to create Azure client: {{err}}", err)
}
client.HTTPClient = cleanhttp.DefaultPooledClient()
blobClient := client.GetBlobService()
container := blobClient.GetContainerReference(name)
_, err = container.CreateIfNotExists(&storage.CreateContainerOptions{
Access: storage.ContainerAccessTypePrivate,
})
if err != nil {
return nil, errwrap.Wrapf(fmt.Sprintf("failed to create %q container: {{err}}", name), err)
}
maxParStr, ok := conf["max_parallel"]
var maxParInt int
if ok {
maxParInt, err = strconv.Atoi(maxParStr)
if err != nil {
return nil, errwrap.Wrapf("failed parsing max_parallel parameter: {{err}}", err)
}
if logger.IsDebug() {
logger.Debug("max_parallel set", "max_parallel", maxParInt)
}
}
a := &AzureBackend{
container: container,
logger: logger,
permitPool: physical.NewPermitPool(maxParInt),
}
return a, nil
}
// Put is used to insert or update an entry
func (a *AzureBackend) Put(ctx context.Context, entry *physical.Entry) error {
defer metrics.MeasureSince([]string{"azure", "put"}, time.Now())
if len(entry.Value) >= MaxBlobSize {
return fmt.Errorf("value is bigger than the current supported limit of 4MBytes")
}
blockID := base64.StdEncoding.EncodeToString([]byte("AAAA"))
blocks := make([]storage.Block, 1)
blocks[0] = storage.Block{ID: blockID, Status: storage.BlockStatusLatest}
a.permitPool.Acquire()
defer a.permitPool.Release()
blob := &storage.Blob{
Container: a.container,
Name: entry.Key,
}
if err := blob.PutBlock(blockID, entry.Value, nil); err != nil {
return err
}
return blob.PutBlockList(blocks, nil)
}
// Get is used to fetch an entry
func (a *AzureBackend) Get(ctx context.Context, key string) (*physical.Entry, error) {
defer metrics.MeasureSince([]string{"azure", "get"}, time.Now())
a.permitPool.Acquire()
defer a.permitPool.Release()
blob := &storage.Blob{
Container: a.container,
Name: key,
}
exists, err := blob.Exists()
if err != nil {
return nil, err
}
if !exists {
return nil, nil
}
reader, err := blob.Get(nil)
if err != nil {
return nil, err
}
defer reader.Close()
data, err := ioutil.ReadAll(reader)
ent := &physical.Entry{
Key: key,
Value: data,
}
return ent, err
}
// Delete is used to permanently delete an entry
func (a *AzureBackend) Delete(ctx context.Context, key string) error {
defer metrics.MeasureSince([]string{"azure", "delete"}, time.Now())
blob := &storage.Blob{
Container: a.container,
Name: key,
}
a.permitPool.Acquire()
defer a.permitPool.Release()
_, err := blob.DeleteIfExists(nil)
return err
}
// List is used to list all the keys under a given
// prefix, up to the next prefix.
func (a *AzureBackend) List(ctx context.Context, prefix string) ([]string, error) {
defer metrics.MeasureSince([]string{"azure", "list"}, time.Now())
a.permitPool.Acquire()
defer a.permitPool.Release()
var marker string
keys := []string{}
for {
list, err := a.container.ListBlobs(storage.ListBlobsParameters{
Prefix: prefix,
Marker: marker,
MaxResults: MaxListResults,
})
if err != nil {
return nil, err
}
for _, blob := range list.Blobs {
key := strings.TrimPrefix(blob.Name, prefix)
if i := strings.Index(key, "/"); i == -1 {
// file
keys = append(keys, key)
} else {
// subdirectory
keys = strutil.AppendIfMissing(keys, key[:i+1])
}
}
if list.NextMarker == "" {
break
}
marker = list.NextMarker
}
sort.Strings(keys)
return keys, nil
}