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google_client.go
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google_client.go
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package obj
import (
"context"
"io"
"net/http"
"strings"
"time"
"cloud.google.com/go/storage"
"github.com/pachyderm/pachyderm/v2/src/internal/errors"
"github.com/pachyderm/pachyderm/v2/src/internal/pacherr"
"github.com/pachyderm/pachyderm/v2/src/internal/pctx"
"github.com/pachyderm/pachyderm/v2/src/internal/promutil"
"github.com/pachyderm/pachyderm/v2/src/internal/tracing"
"google.golang.org/api/googleapi"
"google.golang.org/api/iterator"
"google.golang.org/api/option"
ghttp "google.golang.org/api/transport/http"
)
type googleClient struct {
bucketName string
bucket *storage.BucketHandle
}
func newGoogleClient(bucket string, opts []option.ClientOption) (*googleClient, error) {
ctx := context.Background()
opts = append(opts, option.WithScopes(storage.ScopeFullControl))
// We have to build the transport and supply it to NewClient in order to instrument the
// roundtripper. If we pass the instrumented client directly to NewClient with
// WithHTTPClient, the client won't have any credentials and won't be able to make requests.
tr, err := ghttp.NewTransport(ctx, promutil.InstrumentRoundTripper("google_cloud_storage", http.DefaultTransport), opts...)
if err != nil {
return nil, errors.Errorf("init google transport: %w", err)
}
opts = append(opts, option.WithHTTPClient(&http.Client{
Transport: tr,
}))
client, err := storage.NewClient(context.Background(), opts...)
if err != nil {
return nil, errors.EnsureStack(err)
}
return &googleClient{bucketName: bucket, bucket: client.Bucket(bucket)}, nil
}
func (c *googleClient) Exists(ctx context.Context, name string) (bool, error) {
_, err := c.bucket.Object(name).Attrs(ctx)
if err != nil {
err = c.transformError(err, name)
if pacherr.IsNotExist(err) {
err = nil
}
return false, err
}
tracing.TagAnySpan(ctx, "err", err)
return true, nil
}
func (c *googleClient) Put(ctx context.Context, name string, r io.Reader) (retErr error) {
defer func() { retErr = c.transformError(retErr, name) }()
ctx, cf := pctx.WithCancel(ctx)
defer cf() // this aborts the write if the writer is not already closed
wc := c.bucket.Object(name).NewWriter(ctx)
if _, err := io.Copy(wc, r); err != nil {
return errors.EnsureStack(err)
}
return errors.EnsureStack(wc.Close())
}
func (c *googleClient) Walk(ctx context.Context, name string, fn func(name string) error) (retErr error) {
defer func() { retErr = c.transformError(retErr, name) }()
objectIter := c.bucket.Objects(ctx, &storage.Query{Prefix: name})
for {
objectAttrs, err := objectIter.Next()
if err != nil {
if errors.Is(err, iterator.Done) {
break
}
return errors.EnsureStack(err)
}
if err := fn(objectAttrs.Name); err != nil {
return err
}
}
return nil
}
func (c *googleClient) Get(ctx context.Context, name string, w io.Writer) (retErr error) {
defer func() { retErr = c.transformError(retErr, name) }()
reader, err := c.bucket.Object(name).NewReader(ctx)
if err != nil {
return errors.EnsureStack(err)
}
defer func() {
if err := reader.Close(); retErr == nil {
retErr = err
}
}()
_, err = io.Copy(w, reader)
return errors.EnsureStack(err)
}
func (c *googleClient) Delete(ctx context.Context, name string) (retErr error) {
defer func() { retErr = c.transformError(retErr, name) }()
return errors.EnsureStack(c.bucket.Object(name).Delete(ctx))
}
func (c *googleClient) BucketURL() ObjectStoreURL {
return ObjectStoreURL{
Scheme: "gcs",
Bucket: c.bucketName,
}
}
func (c *googleClient) transformError(err error, objectPath string) error {
const minWait = 250 * time.Millisecond
if err == nil {
return nil
}
if errors.Is(err, storage.ErrObjectNotExist) {
return pacherr.NewNotExist(c.bucketName, objectPath)
}
// https://github.com/pachyderm/pachyderm/v2/issues/912
if strings.Contains(err.Error(), "ParseError") {
return err
}
googleErr := &googleapi.Error{}
if !errors.As(err, &googleErr) {
return err
}
switch googleErr.Code {
case 429:
return pacherr.WrapTransient(err, minWait)
// https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
case 500, 502, 503, 504:
return pacherr.WrapTransient(err, minWait)
}
return err
}