go_goutils/logging/types.go

package logging

import (
	"log"
	"os"
)

/*
	Logger is one of the various loggers offered by this module.
*/
type Logger interface {
	Alert(s string, v ...interface{}) (err error)
	Crit(s string, v ...interface{}) (err error)
	Debug(s string, v ...interface{}) (err error)
	Emerg(s string, v ...interface{}) (err error)
	Err(s string, v ...interface{}) (err error)
	Info(s string, v ...interface{}) (err error)
	Notice(s string, v ...interface{}) (err error)
	Warning(s string, v ...interface{}) (err error)
	DoDebug(d bool)
	SetPrefix(p string)
	GetPrefix() (p string)
	Setup()
	Shutdown()
}

// StdLogger uses the log package in stdlib to perform all logging.
type StdLogger struct {
	// All log.Logger fields/methods are exposed.
	*log.Logger
	/*
		EnableDebug indicates if the debug filter should be disabled (true) or if the filter should be enabled (false).
		This prevents potential data leak of sensitive information, as some loggers (e.g. FileLogger) will otherwise write all messages.
	*/
	EnableDebug bool
	// Prefix indicates the prefix for log entries; in shared logs, this helps differentiate the source.
	Prefix string
}

// FileLogger uses a StdLogger with a file handle writer to write to the file given at Path.
type FileLogger struct {
	// StdLogger is used for the log formation and handling.
	StdLogger
	// Path is the path to the logfile.
	Path string
	// writer is used for the writing out of the log file.
	writer *os.File
}

// MultiLogger is used to contain one or more Loggers and present them all as a single Logger.
type MultiLogger struct {
	/*
		EnableDebug indicates if the debug filter should be disabled (true) or if the filter should be enabled (false).
		This prevents potential data leak of sensitive information, as some loggers (e.g. FileLogger) will otherwise write all messages.
	*/
	EnableDebug bool
	// Prefix indicates the prefix for log entries; in shared logs, this helps differentiate the source.
	Prefix string
	/*
		Loggers contains a map of map[logname]Logger. It can be used to set log-specific options, or replace a Logger
		with one of a different type or options.
	*/
	Loggers map[string]Logger
}