package log

Import Path
	log (on golang.org and go.dev)

Dependency Relation
	imports 6 packages, and imported by 11 packages

Involved Source Files
	d-> log.go

Exported Type Names

type Logger (struct) A Logger represents an active logging object that generates lines of output to an io.Writer. Each logging operation makes a single call to the Writer's Write method. A Logger can be used simultaneously from multiple goroutines; it guarantees to serialize access to the Writer. (*T) Fatal(v ...interface{}) (*T) Fatalf(format string, v ...interface{}) (*T) Fatalln(v ...interface{}) (*T) Flags() int (*T) Output(calldepth int, s string) error (*T) Panic(v ...interface{}) (*T) Panicf(format string, v ...interface{}) (*T) Panicln(v ...interface{}) (*T) Prefix() string (*T) Print(v ...interface{}) (*T) Printf(format string, v ...interface{}) (*T) Println(v ...interface{}) (*T) SetFlags(flag int) (*T) SetOutput(w io.Writer) (*T) SetPrefix(prefix string) (*T) Writer() io.Writer func New(out io.Writer, prefix string, flag int) *Logger func log/syslog.NewLogger(p syslog.Priority, logFlag int) (*Logger, error)
Exported Values
func Fatal(v ...interface{}) Fatal is equivalent to Print() followed by a call to os.Exit(1).
func Fatalf(format string, v ...interface{}) Fatalf is equivalent to Printf() followed by a call to os.Exit(1).
func Fatalln(v ...interface{}) Fatalln is equivalent to Println() followed by a call to os.Exit(1).
func Flags() int Flags returns the output flags for the standard logger. The flag bits are Ldate, Ltime, and so on.
const Ldate = 1 // the date in the local time zone: 2009/01/23 These flags define which text to prefix to each log entry generated by the Logger. Bits are or'ed together to control what's printed. With the exception of the Lmsgprefix flag, there is no control over the order they appear (the order listed here) or the format they present (as described in the comments). The prefix is followed by a colon only when Llongfile or Lshortfile is specified. For example, flags Ldate | Ltime (or LstdFlags) produce, 2009/01/23 01:23:23 message while flags Ldate | Ltime | Lmicroseconds | Llongfile produce, 2009/01/23 01:23:23.123123 /a/b/c/d.go:23: message
const Llongfile = 8 // full file name and line number: /a/b/c/d.go:23 These flags define which text to prefix to each log entry generated by the Logger. Bits are or'ed together to control what's printed. With the exception of the Lmsgprefix flag, there is no control over the order they appear (the order listed here) or the format they present (as described in the comments). The prefix is followed by a colon only when Llongfile or Lshortfile is specified. For example, flags Ldate | Ltime (or LstdFlags) produce, 2009/01/23 01:23:23 message while flags Ldate | Ltime | Lmicroseconds | Llongfile produce, 2009/01/23 01:23:23.123123 /a/b/c/d.go:23: message
const Lmicroseconds = 4 // microsecond resolution: 01:23:23.123123. assumes Ltime. These flags define which text to prefix to each log entry generated by the Logger. Bits are or'ed together to control what's printed. With the exception of the Lmsgprefix flag, there is no control over the order they appear (the order listed here) or the format they present (as described in the comments). The prefix is followed by a colon only when Llongfile or Lshortfile is specified. For example, flags Ldate | Ltime (or LstdFlags) produce, 2009/01/23 01:23:23 message while flags Ldate | Ltime | Lmicroseconds | Llongfile produce, 2009/01/23 01:23:23.123123 /a/b/c/d.go:23: message
const Lmsgprefix = 64 // move the "prefix" from the beginning of the line to before the message These flags define which text to prefix to each log entry generated by the Logger. Bits are or'ed together to control what's printed. With the exception of the Lmsgprefix flag, there is no control over the order they appear (the order listed here) or the format they present (as described in the comments). The prefix is followed by a colon only when Llongfile or Lshortfile is specified. For example, flags Ldate | Ltime (or LstdFlags) produce, 2009/01/23 01:23:23 message while flags Ldate | Ltime | Lmicroseconds | Llongfile produce, 2009/01/23 01:23:23.123123 /a/b/c/d.go:23: message
const Lshortfile = 16 // final file name element and line number: d.go:23. overrides Llongfile These flags define which text to prefix to each log entry generated by the Logger. Bits are or'ed together to control what's printed. With the exception of the Lmsgprefix flag, there is no control over the order they appear (the order listed here) or the format they present (as described in the comments). The prefix is followed by a colon only when Llongfile or Lshortfile is specified. For example, flags Ldate | Ltime (or LstdFlags) produce, 2009/01/23 01:23:23 message while flags Ldate | Ltime | Lmicroseconds | Llongfile produce, 2009/01/23 01:23:23.123123 /a/b/c/d.go:23: message
const LstdFlags = 3 // initial values for the standard logger These flags define which text to prefix to each log entry generated by the Logger. Bits are or'ed together to control what's printed. With the exception of the Lmsgprefix flag, there is no control over the order they appear (the order listed here) or the format they present (as described in the comments). The prefix is followed by a colon only when Llongfile or Lshortfile is specified. For example, flags Ldate | Ltime (or LstdFlags) produce, 2009/01/23 01:23:23 message while flags Ldate | Ltime | Lmicroseconds | Llongfile produce, 2009/01/23 01:23:23.123123 /a/b/c/d.go:23: message
const Ltime = 2 // the time in the local time zone: 01:23:23 These flags define which text to prefix to each log entry generated by the Logger. Bits are or'ed together to control what's printed. With the exception of the Lmsgprefix flag, there is no control over the order they appear (the order listed here) or the format they present (as described in the comments). The prefix is followed by a colon only when Llongfile or Lshortfile is specified. For example, flags Ldate | Ltime (or LstdFlags) produce, 2009/01/23 01:23:23 message while flags Ldate | Ltime | Lmicroseconds | Llongfile produce, 2009/01/23 01:23:23.123123 /a/b/c/d.go:23: message
const LUTC = 32 // if Ldate or Ltime is set, use UTC rather than the local time zone These flags define which text to prefix to each log entry generated by the Logger. Bits are or'ed together to control what's printed. With the exception of the Lmsgprefix flag, there is no control over the order they appear (the order listed here) or the format they present (as described in the comments). The prefix is followed by a colon only when Llongfile or Lshortfile is specified. For example, flags Ldate | Ltime (or LstdFlags) produce, 2009/01/23 01:23:23 message while flags Ldate | Ltime | Lmicroseconds | Llongfile produce, 2009/01/23 01:23:23.123123 /a/b/c/d.go:23: message
func New(out io.Writer, prefix string, flag int) *Logger New creates a new Logger. The out variable sets the destination to which log data will be written. The prefix appears at the beginning of each generated log line, or after the log header if the Lmsgprefix flag is provided. The flag argument defines the logging properties.
func Output(calldepth int, s string) error Output writes the output for a logging event. The string s contains the text to print after the prefix specified by the flags of the Logger. A newline is appended if the last character of s is not already a newline. 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; a value of 1 will print the details for the caller of Output.
func Panic(v ...interface{}) Panic is equivalent to Print() followed by a call to panic().
func Panicf(format string, v ...interface{}) Panicf is equivalent to Printf() followed by a call to panic().
func Panicln(v ...interface{}) Panicln is equivalent to Println() followed by a call to panic().
func Prefix() string Prefix returns the output prefix for the standard logger.
func Print(v ...interface{}) Print calls Output to print to the standard logger. Arguments are handled in the manner of fmt.Print.
func Printf(format string, v ...interface{}) Printf calls Output to print to the standard logger. Arguments are handled in the manner of fmt.Printf.
func Println(v ...interface{}) Println calls Output to print to the standard logger. Arguments are handled in the manner of fmt.Println.
func SetFlags(flag int) SetFlags sets the output flags for the standard logger. The flag bits are Ldate, Ltime, and so on.
func SetOutput(w io.Writer) SetOutput sets the output destination for the standard logger.
func SetPrefix(prefix string) SetPrefix sets the output prefix for the standard logger.
func Writer() io.Writer Writer returns the output destination for the standard logger.