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google_client.go
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/
google_client.go
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package obj
import (
"io"
"strings"
"cloud.google.com/go/storage"
"golang.org/x/net/context"
"golang.org/x/oauth2/google"
"google.golang.org/api/googleapi"
"google.golang.org/api/iterator"
"google.golang.org/api/option"
)
type googleClient struct {
ctx context.Context
bucket *storage.BucketHandle
}
func newGoogleClient(ctx context.Context, bucket string, credFile string) (*googleClient, error) {
opts := []option.ClientOption{option.WithScopes(storage.ScopeFullControl)}
if credFile == "" {
opts = append(opts, option.WithTokenSource(google.ComputeTokenSource("")))
} else {
opts = append(opts, option.WithCredentialsFile(credFile))
}
client, err := storage.NewClient(ctx, opts...)
if err != nil {
return nil, err
}
return &googleClient{ctx, client.Bucket(bucket)}, nil
}
func (c *googleClient) Exists(name string) bool {
_, err := c.bucket.Object(name).Attrs(c.ctx)
return err == nil
}
func (c *googleClient) Writer(name string) (io.WriteCloser, error) {
return newBackoffWriteCloser(c, c.bucket.Object(name).NewWriter(c.ctx)), nil
}
func (c *googleClient) Walk(name string, fn func(name string) error) error {
objectIter := c.bucket.Objects(c.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(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(c.ctx, int64(offset), -1)
} else {
reader, err = c.bucket.Object(name).NewRangeReader(c.ctx, int64(offset), int64(size))
}
if err != nil {
return nil, err
}
return newBackoffReadCloser(c, reader), nil
}
func (c *googleClient) Delete(name string) error {
return c.bucket.Object(name).Delete(c.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
}