Go--Logger學習

Go語言的log

Logger struct

type Logger struct {
    mu      sync.Mutex
    prefix  string
    flag    int
    out     io.Writer
    buf     []byte
}
           

用于記錄日志，sync.Mutex 鎖mu, prefix 每條日志的字首，flag 有Ldata Ltime Lmicroseconds Llongfile Lshortfile LUTC LstdfFlags(Ldate | Ltime), out 輸出端， buf 日志緩存端

New

func New(out io.Writer, prefix string, flag int) *Logger 
           

生成Logger對象

Logger::SetOutput

func (l *Logger)SetOutput(w io.Writer) 
           

設定輸出端

itoa

func itoa(buf *[]byte, i int, wid int)
           

将i轉換為ASCII 寬度限制為wid

Logger::formatHeader

func (l *Logger)formatHeader(buf *[]byte, t time.Time, file string, line int) 
           

格式化輸出 Ldate+’ ‘+Ltime+’ ‘+Llongfile/Lshortfile+’:’+line

Logger::Output

func (l *Logger) Output(calldepth int, s string) error
           

輸出：格式化+’\n’+out.Write(l.buf), calldepth: file路徑深度

Logger::Printf

func (l *Logger) Printf(format string, v ...interface{})
           

Printf 調用Logger::Output并且path=2

Logger::Print

func (l *Logger) Print(v interface{})
           

Print無格式直接輸出

Logger::Println

func (l *Logger) Println(v ...interface{})
           

Println->fmt.Sprintln()->fmt.Println()->l.Output

Logger::Fatal

func (l *Logger) Fatal(v ...interface{})
           

l.Fatal->fmt.Sprint->l.Output->os.Exit(1)

Logger::Fatalf

func (l *Logger) Fatalf(format string, v ...interface{})
           

l.Fatalf->fmt.Sprintf->l.Output->os.Exit(1)

Logger::Fatalln

func (l *Logger) Fatalln(v ...interface{})
           

l.Fatalln->fmt.Sprintln->l.Output->os.Exit(1)

Logger::Panic

func (l *Logger) Panic(v ...interface{})
           

l.Panic->fmt.Sprint->l.Output->panic(s)

Logger::Panicf

func (l *Logger) Panicf(format string, v ...interface{})
           

l.Panicf->fmt.Sprintf->l.Output->panic(s)

Logger::Panicln

func (l *Logger) Panicln(v ...interface{})
           

l.Panicln->fmt.Sprintln->l.Output(2, s)->panic(s)

Flags

func (l *Logger) Flags() int
           

擷取flag

SetFlags

func (l *logger) SetFlags(flag int)
           

設定Flag

Prefix

func (l *Logger) Prefix() string
           

擷取prefix string

SetPrefix

func (l *Logger) SetPrefix(prefix string)
           

設定prefix string

std

New std

var std = New(os.Stderr, "", LstdFlags)
           

标準錯誤輸出

std functions

func Flag()int
func SetFlag(flag int)
           

調用std.Flag std.SetFlag

func Prefix()string
func SetPrefix(prefix string)
           

調用std.Prefix std.SetPrefix

func Print(v ...interface{})
func Printf(format string, v ...interface{})
func Println(v ...interface{})
           

調用std.Print std.Printf…

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

調用std.Fatal std.Fatalf…

func Panic(v ...interface{})
func Panicf(format string, v ...interface{})
func Panicln(v ...interface{})
           

調用std.Panic std.Panicf std.Panicln..

func Output(calldepth int, s string) error
           

調用std.Output

// Calldepth is the count of the number of

// frames to skip when computing the file name and line number

// if Llongfile or Lshortfile is set;