Documentation
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Overview ¶
Package log implements a work-alike to the standard library's log package that writes logging on os.Stdout and os.Stderr to a JSON even stream written to os.Stdout. All other output io.Writers are treated the same as if written to by the stdlib log package.
Index ¶
- Constants
- func Fatal(v ...interface{})
- func Fatalf(format string, v ...interface{})
- func Fatalln(v ...interface{})
- func Flags() int
- func Output(calldepth int, s string) error
- func Panic(v ...interface{})
- func Panicf(format string, v ...interface{})
- func Panicln(v ...interface{})
- func Prefix() string
- func Print(v ...interface{})
- func Printf(format string, v ...interface{})
- func Println(v ...interface{})
- func SetFlags(flag int)
- func SetOutput(w io.Writer)
- func SetPrefix(prefix string)
- func Writer() io.Writer
- type Logger
Constants ¶
const ( Ldate = 1 << iota // the date in the local time zone: 2009/01/23 Ltime // the time in the local time zone: 01:23:23 Lmicroseconds // microsecond resolution: 01:23:23.123123. assumes Ltime. Llongfile // full file name and line number: /a/b/c/d.go:23 Lshortfile // final file name element and line number: d.go:23. overrides Llongfile LUTC // if Ldate or Ltime is set, use UTC rather than the local time zone Lmsgprefix // move the "prefix" from the beginning of the line to before the message LstdFlags = Ldate | Ltime // 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
Variables ¶
This section is empty.
Functions ¶
func Fatalf ¶
func Fatalf(format string, v ...interface{})
Fatalf mimics Printf() followed by a call to os.Exit(1).
func Fatalln ¶
func Fatalln(v ...interface{})
Fatalln mimics Println() followed by a call to os.Exit(1).
func Flags ¶
func Flags() int
Flags returns the output flags for the standard logger. The flag bits are Ldate, Ltime, and so on.
func Output ¶
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 Panicf ¶
func Panicf(format string, v ...interface{})
Panicf minics Printf() followed by a call to panic().
func Panicln ¶
func Panicln(v ...interface{})
Panicln mimics to Println() followed by a call to panic().
func Print ¶
func Print(v ...interface{})
Print calls Output to print to the standard logger. Arguments are handled in the manner of fmt.Print.
func Printf ¶
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 ¶
func Println(v ...interface{})
Println calls Output to print to the standard logger. Arguments are handled in the manner of fmt.Println.
func SetFlags ¶
func SetFlags(flag int)
SetFlags sets the output flags for the standard logger. The flag bits are Ldate, Ltime, and so on.
Types ¶
type Logger ¶
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.
Source Files