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moby--moby/distribution/errors.go
Derek McGowan cca0132fcf Add class to repository scope
Expose registry error translation for plugin distribution

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
(cherry picked from commit a12b466183)
Signed-off-by: Victor Vieux <vieux@docker.com>
2016-12-09 14:10:29 -08:00

159 lines
4.6 KiB
Go

package distribution
import (
"net/url"
"strings"
"syscall"
"github.com/Sirupsen/logrus"
"github.com/docker/distribution"
"github.com/docker/distribution/registry/api/errcode"
"github.com/docker/distribution/registry/api/v2"
"github.com/docker/distribution/registry/client"
"github.com/docker/distribution/registry/client/auth"
"github.com/docker/docker/distribution/xfer"
"github.com/docker/docker/reference"
"github.com/pkg/errors"
)
// ErrNoSupport is an error type used for errors indicating that an operation
// is not supported. It encapsulates a more specific error.
type ErrNoSupport struct{ Err error }
func (e ErrNoSupport) Error() string {
if e.Err == nil {
return "not supported"
}
return e.Err.Error()
}
// fallbackError wraps an error that can possibly allow fallback to a different
// endpoint.
type fallbackError struct {
// err is the error being wrapped.
err error
// confirmedV2 is set to true if it was confirmed that the registry
// supports the v2 protocol. This is used to limit fallbacks to the v1
// protocol.
confirmedV2 bool
// transportOK is set to true if we managed to speak HTTP with the
// registry. This confirms that we're using appropriate TLS settings
// (or lack of TLS).
transportOK bool
}
// Error renders the FallbackError as a string.
func (f fallbackError) Error() string {
return f.Cause().Error()
}
func (f fallbackError) Cause() error {
return f.err
}
// shouldV2Fallback returns true if this error is a reason to fall back to v1.
func shouldV2Fallback(err errcode.Error) bool {
switch err.Code {
case errcode.ErrorCodeUnauthorized, v2.ErrorCodeManifestUnknown, v2.ErrorCodeNameUnknown:
return true
}
return false
}
// TranslatePullError is used to convert an error from a registry pull
// operation to an error representing the entire pull operation. Any error
// information which is not used by the returned error gets output to
// log at info level.
func TranslatePullError(err error, ref reference.Named) error {
switch v := err.(type) {
case errcode.Errors:
if len(v) != 0 {
for _, extra := range v[1:] {
logrus.Infof("Ignoring extra error returned from registry: %v", extra)
}
return TranslatePullError(v[0], ref)
}
case errcode.Error:
var newErr error
switch v.Code {
case errcode.ErrorCodeDenied:
// ErrorCodeDenied is used when access to the repository was denied
newErr = errors.Errorf("repository %s not found: does not exist or no pull access", ref.Name())
case v2.ErrorCodeManifestUnknown:
newErr = errors.Errorf("manifest for %s not found", ref.String())
case v2.ErrorCodeNameUnknown:
newErr = errors.Errorf("repository %s not found", ref.Name())
}
if newErr != nil {
logrus.Infof("Translating %q to %q", err, newErr)
return newErr
}
case xfer.DoNotRetry:
return TranslatePullError(v.Err, ref)
}
return err
}
// continueOnError returns true if we should fallback to the next endpoint
// as a result of this error.
func continueOnError(err error) bool {
switch v := err.(type) {
case errcode.Errors:
if len(v) == 0 {
return true
}
return continueOnError(v[0])
case ErrNoSupport:
return continueOnError(v.Err)
case errcode.Error:
return shouldV2Fallback(v)
case *client.UnexpectedHTTPResponseError:
return true
case ImageConfigPullError:
return false
case error:
return !strings.Contains(err.Error(), strings.ToLower(syscall.ENOSPC.Error()))
}
// let's be nice and fallback if the error is a completely
// unexpected one.
// If new errors have to be handled in some way, please
// add them to the switch above.
return true
}
// retryOnError wraps the error in xfer.DoNotRetry if we should not retry the
// operation after this error.
func retryOnError(err error) error {
switch v := err.(type) {
case errcode.Errors:
if len(v) != 0 {
return retryOnError(v[0])
}
case errcode.Error:
switch v.Code {
case errcode.ErrorCodeUnauthorized, errcode.ErrorCodeUnsupported, errcode.ErrorCodeDenied, errcode.ErrorCodeTooManyRequests, v2.ErrorCodeNameUnknown:
return xfer.DoNotRetry{Err: err}
}
case *url.Error:
switch v.Err {
case auth.ErrNoBasicAuthCredentials, auth.ErrNoToken:
return xfer.DoNotRetry{Err: v.Err}
}
return retryOnError(v.Err)
case *client.UnexpectedHTTPResponseError:
return xfer.DoNotRetry{Err: err}
case error:
if err == distribution.ErrBlobUnknown {
return xfer.DoNotRetry{Err: err}
}
if strings.Contains(err.Error(), strings.ToLower(syscall.ENOSPC.Error())) {
return xfer.DoNotRetry{Err: err}
}
}
// let's be nice and fallback if the error is a completely
// unexpected one.
// If new errors have to be handled in some way, please
// add them to the switch above.
return err
}