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https://github.com/moby/moby.git
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113 lines
3.2 KiB
Go
113 lines
3.2 KiB
Go
package distribution
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import (
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"net/url"
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"strings"
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"syscall"
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"github.com/docker/distribution/registry/api/errcode"
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"github.com/docker/distribution/registry/api/v2"
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"github.com/docker/distribution/registry/client"
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"github.com/docker/distribution/registry/client/auth"
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"github.com/docker/docker/distribution/xfer"
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)
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// ErrNoSupport is an error type used for errors indicating that an operation
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// is not supported. It encapsulates a more specific error.
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type ErrNoSupport struct{ Err error }
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func (e ErrNoSupport) Error() string {
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if e.Err == nil {
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return "not supported"
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}
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return e.Err.Error()
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}
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// fallbackError wraps an error that can possibly allow fallback to a different
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// endpoint.
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type fallbackError struct {
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// err is the error being wrapped.
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err error
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// confirmedV2 is set to true if it was confirmed that the registry
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// supports the v2 protocol. This is used to limit fallbacks to the v1
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// protocol.
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confirmedV2 bool
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// transportOK is set to true if we managed to speak HTTP with the
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// registry. This confirms that we're using appropriate TLS settings
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// (or lack of TLS).
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transportOK bool
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}
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// Error renders the FallbackError as a string.
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func (f fallbackError) Error() string {
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return f.err.Error()
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}
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// shouldV2Fallback returns true if this error is a reason to fall back to v1.
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func shouldV2Fallback(err errcode.Error) bool {
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switch err.Code {
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case errcode.ErrorCodeUnauthorized, v2.ErrorCodeManifestUnknown, v2.ErrorCodeNameUnknown:
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return true
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}
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return false
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}
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// continueOnError returns true if we should fallback to the next endpoint
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// as a result of this error.
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func continueOnError(err error) bool {
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switch v := err.(type) {
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case errcode.Errors:
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if len(v) == 0 {
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return true
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}
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return continueOnError(v[0])
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case ErrNoSupport:
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return continueOnError(v.Err)
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case errcode.Error:
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return shouldV2Fallback(v)
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case *client.UnexpectedHTTPResponseError:
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return true
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case ImageConfigPullError:
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return false
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case error:
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return !strings.Contains(err.Error(), strings.ToLower(syscall.ENOSPC.Error()))
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}
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// let's be nice and fallback if the error is a completely
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// unexpected one.
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// If new errors have to be handled in some way, please
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// add them to the switch above.
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return true
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}
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// retryOnError wraps the error in xfer.DoNotRetry if we should not retry the
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// operation after this error.
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func retryOnError(err error) error {
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switch v := err.(type) {
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case errcode.Errors:
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if len(v) != 0 {
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return retryOnError(v[0])
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}
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case errcode.Error:
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switch v.Code {
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case errcode.ErrorCodeUnauthorized, errcode.ErrorCodeUnsupported, errcode.ErrorCodeDenied, errcode.ErrorCodeTooManyRequests:
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return xfer.DoNotRetry{Err: err}
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}
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case *url.Error:
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switch v.Err {
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case auth.ErrNoBasicAuthCredentials, auth.ErrNoToken:
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return xfer.DoNotRetry{Err: v.Err}
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}
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return retryOnError(v.Err)
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case *client.UnexpectedHTTPResponseError:
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return xfer.DoNotRetry{Err: err}
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case error:
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if strings.Contains(err.Error(), strings.ToLower(syscall.ENOSPC.Error())) {
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return xfer.DoNotRetry{Err: err}
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}
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}
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// let's be nice and fallback if the error is a completely
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// unexpected one.
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// If new errors have to be handled in some way, please
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// add them to the switch above.
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return err
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}
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