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objstorage.go
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objstorage.go
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package objstorage
import (
"context"
"io"
"time"
"cloud.google.com/go/storage"
"github.com/pkg/errors"
"google.golang.org/api/option"
)
type Storage struct {
client *storage.Client
bucket string
predefinedAcl string
}
func NewStorage(ctx context.Context, credentialsOption option.ClientOption, bucket string, predefinedAcl string, opts ...option.ClientOption) (*Storage, error) {
if credentialsOption == nil {
return nil, errors.New("missing google credentials")
}
accessOpts := make([]option.ClientOption, 0)
if len(opts) == 0 || opts == nil {
accessOpts = append(accessOpts, credentialsOption)
} else {
accessOpts = append(opts, credentialsOption)
}
client, err := storage.NewClient(ctx, accessOpts...)
if err != nil {
return nil, errors.Wrap(err, "create google client fail")
}
return &Storage{client: client, bucket: bucket, predefinedAcl: predefinedAcl}, nil
}
func (g *Storage) UploadWithRetries(ctx context.Context, name string, data []byte, retryCount int, waitDuration time.Duration) error {
var err error
for i := 0; i < retryCount; i++ {
err = g.Upload(ctx, name, data)
if err == nil {
return nil
}
time.Sleep(waitDuration)
}
return err
}
func (g *Storage) Upload(ctx context.Context, name string, data []byte) (err error) {
objectHandle := g.client.Bucket(g.bucket).Object(name)
writer := objectHandle.NewWriter(ctx)
defer func() {
if writerErr := writer.Close(); err == nil && writerErr != nil {
err = errors.Wrap(writerErr, "failed to close writer")
}
}()
if g.predefinedAcl != "" {
writer.PredefinedACL = g.predefinedAcl
}
if _, err := writer.Write(data); err != nil {
return errors.Wrap(err, "failed to write data")
}
return nil
}
func (g *Storage) GetWriter(ctx context.Context, name, contentType string) io.WriteCloser {
objectHandle := g.client.Bucket(g.bucket).Object(name)
writer := objectHandle.NewWriter(ctx)
if g.predefinedAcl != "" {
writer.PredefinedACL = g.predefinedAcl
}
if contentType != "" {
writer.ContentType = contentType
}
return writer
}
func (g *Storage) CopyWithRetries(ctx context.Context, source string, destination string, retryCount int, waitDuration time.Duration) error {
var err error
for i := 0; i < retryCount; i++ {
err = g.Copy(ctx, source, destination)
if err == nil {
return nil
}
time.Sleep(waitDuration)
}
return err
}
func (g *Storage) Copy(ctx context.Context, source string, destination string) error {
src := g.client.Bucket(g.bucket).Object(source)
dst := g.client.Bucket(g.bucket).Object(destination)
copier := dst.CopierFrom(src)
if g.predefinedAcl != "" {
copier.PredefinedACL = g.predefinedAcl
}
_, err := copier.Run(ctx)
if err != nil {
return errors.Wrapf(err, "failed to copy from %s to %s", source, destination)
}
return nil
}
func (g *Storage) Check(ctx context.Context, name string) (bool, error) {
objectHandle := g.client.Bucket(g.bucket).Object(name)
attr, err := objectHandle.Attrs(ctx)
if err != nil {
if err == storage.ErrObjectNotExist {
return false, nil
}
return false, errors.Wrap(err, "failed to read data")
}
return attr != nil, nil
}
func (g *Storage) Download(ctx context.Context, name string) (data []byte, err error) {
objectHandle := g.client.Bucket(g.bucket).Object(name)
reader, err := objectHandle.NewReader(ctx)
if err != nil {
return nil, errors.Wrap(err, "failed to read data")
}
defer func() {
if readerErr := reader.Close(); err == nil && readerErr != nil {
err = errors.Wrap(readerErr, "reader error")
}
}()
if data, err = io.ReadAll(reader); err != nil {
return nil, errors.Wrap(err, "failed to read stream")
}
return data, nil
}
func (g *Storage) Delete(ctx context.Context, bucket string, name string) error {
objectHandle := g.client.Bucket(bucket).Object(name)
if err := objectHandle.Delete(ctx); err != nil {
return errors.Wrap(err, "failed to delete data")
}
return nil
}