forked from pachyderm/pachyderm
/
google_client.go
91 lines (79 loc) · 2.35 KB
/
google_client.go
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package obj
import (
"io"
"strings"
"cloud.google.com/go/storage"
"golang.org/x/net/context"
"google.golang.org/api/googleapi"
"google.golang.org/api/iterator"
"google.golang.org/api/option"
)
type googleClient struct {
bucket *storage.BucketHandle
}
func newGoogleClient(bucket string, opts []option.ClientOption) (*googleClient, error) {
opts = append(opts, option.WithScopes(storage.ScopeFullControl))
client, err := storage.NewClient(context.Background(), opts...)
if err != nil {
return nil, err
}
return &googleClient{client.Bucket(bucket)}, nil
}
func (c *googleClient) Exists(ctx context.Context, name string) bool {
_, err := c.bucket.Object(name).Attrs(ctx)
return err == nil
}
func (c *googleClient) Writer(ctx context.Context, name string) (io.WriteCloser, error) {
return newBackoffWriteCloser(ctx, c, c.bucket.Object(name).NewWriter(ctx)), nil
}
func (c *googleClient) Walk(ctx context.Context, name string, fn func(name string) error) error {
objectIter := c.bucket.Objects(ctx, &storage.Query{Prefix: name})
for {
objectAttrs, err := objectIter.Next()
if err != nil {
if err == iterator.Done {
break
}
return err
}
if err := fn(objectAttrs.Name); err != nil {
return err
}
}
return nil
}
func (c *googleClient) Reader(ctx context.Context, name string, offset uint64, size uint64) (io.ReadCloser, error) {
var reader io.ReadCloser
var err error
if size == 0 {
// a negative length will cause the object to be read till the end
reader, err = c.bucket.Object(name).NewRangeReader(ctx, int64(offset), -1)
} else {
reader, err = c.bucket.Object(name).NewRangeReader(ctx, int64(offset), int64(size))
}
if err != nil {
return nil, err
}
return newBackoffReadCloser(ctx, c, reader), nil
}
func (c *googleClient) Delete(ctx context.Context, name string) error {
return c.bucket.Object(name).Delete(ctx)
}
func (c *googleClient) IsRetryable(err error) (ret bool) {
googleErr, ok := err.(*googleapi.Error)
if !ok {
return false
}
// https://github.com/pachyderm/pachyderm/issues/912
return googleErr.Code >= 500 || strings.Contains(err.Error(), "Parse Error")
}
func (c *googleClient) IsNotExist(err error) (result bool) {
return err == storage.ErrObjectNotExist
}
func (c *googleClient) IsIgnorable(err error) bool {
googleErr, ok := err.(*googleapi.Error)
if !ok {
return false
}
return googleErr.Code == 429
}