seaweedfs/weed/remote_storage/gcs/gcs_storage_client.go

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package s3
import (
"cloud.google.com/go/storage"
"context"
"fmt"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/chrislusf/seaweedfs/weed/remote_storage"
"github.com/chrislusf/seaweedfs/weed/util"
"google.golang.org/api/iterator"
"google.golang.org/api/option"
"io"
"io/ioutil"
"os"
"reflect"
)
func init() {
remote_storage.RemoteStorageClientMakers["gcs"] = new(gcsRemoteStorageMaker)
}
type gcsRemoteStorageMaker struct{}
func (s gcsRemoteStorageMaker) Make(conf *filer_pb.RemoteConf) (remote_storage.RemoteStorageClient, error) {
client := &gcsRemoteStorageClient{
conf: conf,
}
googleApplicationCredentials := conf.GcsGoogleApplicationCredentials
if googleApplicationCredentials == "" {
found := false
googleApplicationCredentials, found = os.LookupEnv("GOOGLE_APPLICATION_CREDENTIALS")
if !found {
return nil, fmt.Errorf("need to specific GOOGLE_APPLICATION_CREDENTIALS env variable")
}
}
googleApplicationCredentials = util.ResolvePath(googleApplicationCredentials)
c, err := storage.NewClient(context.Background(), option.WithCredentialsFile(googleApplicationCredentials))
if err != nil {
return nil, fmt.Errorf("failed to create client: %v", err)
}
client.client = c
return client, nil
}
type gcsRemoteStorageClient struct {
conf *filer_pb.RemoteConf
client *storage.Client
}
var _ = remote_storage.RemoteStorageClient(&gcsRemoteStorageClient{})
func (gcs *gcsRemoteStorageClient) Traverse(loc *filer_pb.RemoteStorageLocation, visitFn remote_storage.VisitFunc) (err error) {
pathKey := loc.Path[1:]
objectIterator := gcs.client.Bucket(loc.Bucket).Objects(context.Background(), &storage.Query{
Delimiter: "",
Prefix: pathKey,
Versions: false,
})
var objectAttr *storage.ObjectAttrs
for err == nil {
objectAttr, err = objectIterator.Next()
if err != nil {
if err == iterator.Done {
return nil
}
return err
}
key := objectAttr.Name
key = "/" + key
dir, name := util.FullPath(key).DirAndName()
err = visitFn(dir, name, false, &filer_pb.RemoteEntry{
RemoteMtime: objectAttr.Updated.Unix(),
RemoteSize: objectAttr.Size,
RemoteETag: objectAttr.Etag,
StorageName: gcs.conf.Name,
})
}
return
}
func (gcs *gcsRemoteStorageClient) ReadFile(loc *filer_pb.RemoteStorageLocation, offset int64, size int64) (data []byte, err error) {
key := loc.Path[1:]
rangeReader, readErr := gcs.client.Bucket(loc.Bucket).Object(key).NewRangeReader(context.Background(), offset, size)
if readErr != nil {
return nil, readErr
}
data, err = ioutil.ReadAll(rangeReader)
if err != nil {
return nil, fmt.Errorf("failed to download file %s%s: %v", loc.Bucket, loc.Path, err)
}
return
}
func (gcs *gcsRemoteStorageClient) WriteDirectory(loc *filer_pb.RemoteStorageLocation, entry *filer_pb.Entry) (err error) {
return nil
}
func (gcs *gcsRemoteStorageClient) WriteFile(loc *filer_pb.RemoteStorageLocation, entry *filer_pb.Entry, reader io.Reader) (remoteEntry *filer_pb.RemoteEntry, err error) {
key := loc.Path[1:]
wc := gcs.client.Bucket(loc.Bucket).Object(key).NewWriter(context.Background())
if _, err = io.Copy(wc, reader); err != nil {
wc.Close()
return nil, fmt.Errorf("upload to gcs %s/%s%s: %v", loc.Name, loc.Bucket, loc.Path, err)
}
if err = wc.Close(); err != nil {
return nil, fmt.Errorf("close gcs %s/%s%s: %v", loc.Name, loc.Bucket, loc.Path, err)
}
metadata := toMetadata(entry.Extended)
if len(metadata) > 0 {
if _, err = gcs.client.Bucket(loc.Bucket).Object(key).Update(context.Background(), storage.ObjectAttrsToUpdate{
Metadata: metadata,
}); err != nil {
return nil, fmt.Errorf("update metadata gcs %s/%s%s: %v", loc.Name, loc.Bucket, loc.Path, err)
}
}
// read back the remote entry
return gcs.readFileRemoteEntry(loc)
}
func (gcs *gcsRemoteStorageClient) readFileRemoteEntry(loc *filer_pb.RemoteStorageLocation) (*filer_pb.RemoteEntry, error) {
key := loc.Path[1:]
attr, err := gcs.client.Bucket(loc.Bucket).Object(key).Attrs(context.Background())
if err != nil {
return nil, err
}
return &filer_pb.RemoteEntry{
RemoteMtime: attr.Updated.Unix(),
RemoteSize: attr.Size,
RemoteETag: attr.Etag,
StorageName: gcs.conf.Name,
}, nil
}
func toMetadata(attributes map[string][]byte) map[string]string {
metadata := make(map[string]string)
for k, v := range attributes {
metadata[k] = string(v)
}
return metadata
}
func (gcs *gcsRemoteStorageClient) UpdateFileMetadata(loc *filer_pb.RemoteStorageLocation, oldEntry *filer_pb.Entry, newEntry *filer_pb.Entry) (err error) {
if reflect.DeepEqual(oldEntry.Extended, newEntry.Extended) {
return nil
}
metadata := toMetadata(newEntry.Extended)
key := loc.Path[1:]
if len(metadata) > 0 {
_, err = gcs.client.Bucket(loc.Bucket).Object(key).Update(context.Background(), storage.ObjectAttrsToUpdate{
Metadata: metadata,
})
} else {
// no way to delete the metadata yet
}
return
}
func (gcs *gcsRemoteStorageClient) DeleteFile(loc *filer_pb.RemoteStorageLocation) (err error) {
key := loc.Path[1:]
if err = gcs.client.Bucket(loc.Bucket).Object(key).Delete(context.Background()); err != nil {
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return fmt.Errorf("gcs delete %s%s: %v", loc.Bucket, key, err)
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}
return
}