log

Documentation

Overview

package log provides a simple logger with leveled log messages.

• DebugLevel (highest verbosity)
• InfoLevel
• WarningLevel
• ErrorLevel
• FatalLevel (lowest verbosity)

Output is by default written to STDERR. A different output can be specified. Dates and terminal colors can be turned on.

Example

SetOutput(os.Stdout)
SetLevel(WarningLevel)
SetDate(false)
SetColor(false)

Debug("some debug number: %d\n", 10)
Info("some info number: %d\n", 20)
Warning("some warning number: %d\n", 30)
Error("some error number: %d\n", 40)

Output:

[WARN] some warning number: 30
[ERRO] some error number: 40

Index

• Constants
• func Debug(format string, v ...interface{})
• func Error(format string, v ...interface{})
• func Fatal(format string, v ...interface{})
• func Info(format string, v ...interface{})
• func SetColor(ok bool)
• func SetDate(ok bool)
• func SetLevel(lv level)
• func SetOutput(writer io.Writer)
• func Warning(format string, v ...interface{})

Examples

• Package

Constants

const (
	DebugLevel   level = iota // DebugLevel logs all messages
	InfoLevel                 // InfoLevel logs info messages and and above
	WarningLevel              // WarningLevel logs warning messages and above
	ErrorLevel                // ErrorLevel logs error messages and above
	FatalLevel                // FatalLevel only logs fatal messages
)

Functions

func Debug

func Debug(format string, v ...interface{})

func Error

func Error(format string, v ...interface{})

func Fatal

func Fatal(format string, v ...interface{})

func Info

func Info(format string, v ...interface{})

func SetColor

func SetColor(ok bool)

SetColor (un)sets terminal colors.

func SetDate

func SetDate(ok bool)

SetDate (un)sets date output.

func SetLevel

func SetLevel(lv level)

SetLevel sets the logging level. Available options: DebugLevel, InfoLevel, WarningLevel, ErrorLevel, FatalLevel.

func SetOutput

func SetOutput(writer io.Writer)

SetOutput sets the logging output to a particular writer.

func Warning

func Warning(format string, v ...interface{})