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package azblob
import (
"context"
"net/url"
"os"
"path/filepath"
"strings"
"time"
"github.com/Azure/azure-sdk-for-go/sdk/azidentity"
"github.com/Azure/azure-sdk-for-go/sdk/storage/azblob"
"github.com/pkg/errors"
)
const (
attrSecretAccessKey = "secret_access_key"
attrAccountName = "account_name"
attrAccountURL = "account_url"
attrPrefix = "prefix"
attrManifestsPrefix = "manifests_prefix"
attrBlobsPrefix = "blobs_prefix"
attrName = "name"
attrContainer = "container"
IOConcurrency = 4
IOChunkSize = 32 * 1024 * 1024
)
type Config struct {
AccountURL string
Container string
Prefix string
ManifestsPrefix string
BlobsPrefix string
Names []string
AccountName string
secretAccessKey string
}
func getConfig(attrs map[string]string) (*Config, error) {
accountURLString, ok := attrs[attrAccountURL]
if !ok {
accountURLString, ok = os.LookupEnv("BUILDKIT_AZURE_STORAGE_ACCOUNT_URL")
if !ok {
return &Config{}, errors.New("either ${BUILDKIT_AZURE_STORAGE_ACCOUNT_URL} or account_url attribute is required for azblob cache")
}
}
accountURL, err := url.Parse(accountURLString)
if err != nil {
return &Config{}, errors.Wrap(err, "azure storage account url provided is not a valid url")
}
accountName, ok := attrs[attrAccountName]
if !ok {
accountName, ok = os.LookupEnv("BUILDKIT_AZURE_STORAGE_ACCOUNT_NAME")
if !ok {
accountName = strings.Split(accountURL.Hostname(), ".")[0]
}
}
if accountName == "" {
return &Config{}, errors.New("unable to retrieve account name from account url or ${BUILDKIT_AZURE_STORAGE_ACCOUNT_NAME} or account_name attribute for azblob cache")
}
container, ok := attrs[attrContainer]
if !ok {
container, ok = os.LookupEnv("BUILDKIT_AZURE_STORAGE_CONTAINER")
if !ok {
container = "buildkit-cache"
}
}
prefix, ok := attrs[attrPrefix]
if !ok {
prefix, _ = os.LookupEnv("BUILDKIT_AZURE_STORAGE_PREFIX")
}
manifestsPrefix, ok := attrs[attrManifestsPrefix]
if !ok {
manifestsPrefix = "manifests"
}
blobsPrefix, ok := attrs[attrBlobsPrefix]
if !ok {
blobsPrefix = "blobs"
}
names := []string{"buildkit"}
name, ok := attrs[attrName]
if ok {
splittedNames := strings.Split(name, ";")
if len(splittedNames) > 0 {
names = splittedNames
}
}
secretAccessKey := attrs[attrSecretAccessKey]
config := Config{
AccountURL: accountURLString,
AccountName: accountName,
Container: container,
Prefix: prefix,
Names: names,
ManifestsPrefix: manifestsPrefix,
BlobsPrefix: blobsPrefix,
secretAccessKey: secretAccessKey,
}
return &config, nil
}
func createContainerClient(ctx context.Context, config *Config) (*azblob.ContainerClient, error) {
var serviceClient *azblob.ServiceClient
if config.secretAccessKey != "" {
sharedKey, err := azblob.NewSharedKeyCredential(config.AccountName, config.secretAccessKey)
if err != nil {
return nil, errors.Wrap(err, "failed to create shared key")
}
serviceClient, err = azblob.NewServiceClientWithSharedKey(config.AccountURL, sharedKey, &azblob.ClientOptions{})
if err != nil {
return nil, errors.Wrap(err, "failed to created service client from shared key")
}
} else {
cred, err := azidentity.NewDefaultAzureCredential(nil)
if err != nil {
return nil, errors.Wrap(err, "failed to create default azure credentials")
}
serviceClient, err = azblob.NewServiceClient(config.AccountURL, cred, &azblob.ClientOptions{})
if err != nil {
return nil, errors.Wrap(err, "failed to create service client")
}
}
ctx, cnclFn := context.WithCancelCause(ctx)
ctx, _ = context.WithTimeoutCause(ctx, time.Second*60, errors.WithStack(context.DeadlineExceeded))
defer cnclFn(errors.WithStack(context.Canceled))
containerClient, err := serviceClient.NewContainerClient(config.Container)
if err != nil {
return nil, errors.Wrap(err, "error creating container client")
}
_, err = containerClient.GetProperties(ctx, &azblob.ContainerGetPropertiesOptions{})
if err == nil {
return containerClient, nil
}
var se *azblob.StorageError
if errors.As(err, &se) && se.ErrorCode == azblob.StorageErrorCodeContainerNotFound {
ctx, cnclFn := context.WithCancelCause(ctx)
ctx, _ = context.WithTimeoutCause(ctx, time.Minute*5, errors.WithStack(context.DeadlineExceeded))
defer cnclFn(errors.WithStack(context.Canceled))
_, err := containerClient.Create(ctx, &azblob.ContainerCreateOptions{})
if err != nil {
return nil, errors.Wrapf(err, "failed to create cache container %s", config.Container)
}
return containerClient, nil
}
return nil, errors.Wrapf(err, "failed to get properties of cache container %s", config.Container)
}
func manifestKey(config *Config, name string) string {
key := filepath.Join(config.Prefix, config.ManifestsPrefix, name)
return key
}
func blobKey(config *Config, digest string) string {
key := filepath.Join(config.Prefix, config.BlobsPrefix, digest)
return key
}
func blobExists(ctx context.Context, containerClient *azblob.ContainerClient, blobKey string) (bool, error) {
blobClient, err := containerClient.NewBlobClient(blobKey)
if err != nil {
return false, errors.Wrap(err, "error creating blob client")
}
ctx, cnclFn := context.WithCancelCause(ctx)
ctx, _ = context.WithTimeoutCause(ctx, time.Second*60, errors.WithStack(context.DeadlineExceeded))
defer cnclFn(errors.WithStack(context.Canceled))
_, err = blobClient.GetProperties(ctx, &azblob.BlobGetPropertiesOptions{})
if err == nil {
return true, nil
}
var se *azblob.StorageError
if errors.As(err, &se) && se.ErrorCode == azblob.StorageErrorCodeBlobNotFound {
return false, nil
}
return false, errors.Wrapf(err, "failed to check blob %s existence", blobKey)
}
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