log

type DebugMessage struct {
	Operation string `json:"operation,omitempty"`
	Command   string `json:"job,omitempty"`
	Err       string `json:"error"`
}

type ErrorMessage struct {
	Operation string `json:"operation,omitempty"`
	Command   string `json:"command,omitempty"`
	Err       string `json:"error"`
}

type InfoMessage struct {
	Operation   string   `json:"operation"`
	Success     bool     `json:"success"`
	Source      *url.URL `json:"source,omitempty"`
	Destination *url.URL `json:"destination,omitempty"`
	Object      Message  `json:"object,omitempty"`

	// the VersionID field exist only for JSON Marshall, it must not be used for
	// any other purpose.
	VersionID string `json:"version_id,omitempty"`
}

type LogLevel int

type Logger struct {
	// contains filtered or unexported fields
}

type Message interface {
	fmt.Stringer
	JSON() string
}

type TraceMessage struct {
	Message string `json:"message"`
}