log/log.go

package log

import (
	"fmt"
	"github.com/davecgh/go-spew/spew"
	"os"
	"path/filepath"
	"runtime"
	"time"
)

var level = 0

const (
	// TRACE level
	TRACE = 0

	// DEBUG level
	DEBUG = 1

	// INFO level
	INFO = 2

	// WARNING level
	WARNING = 3

	// ERROR level
	ERROR = 4

	// FATAL level
	FATAL = 5
)

// Stringer interface
type Stringer interface {
	LogString() string
}

// Init logger
func Init(plevel int) {
	level = plevel
}

// Dump object
func Dump(a ...interface{}) string {
	return spew.Sdump(a...)
}

func dump(a ...interface{}) []interface{} {
	for ai, av := range a {
		if avf, ok := av.(func() string); ok {
			a[ai] = avf()
		} else if avf, ok := av.(Stringer); ok {
			a[ai] = avf.LogString()
		} else if avf, ok := av.(fmt.GoStringer); ok {
			a[ai] = avf.GoString()
		} else if avf, ok := av.(fmt.Stringer); ok {
			a[ai] = avf.String()
		}
	}
	return a
}

// Trace log
func Trace(a ...interface{}) {
	if level <= TRACE {
		_, path, line, _ := runtime.Caller(1)
		_, file := filepath.Split(path)
		fmt.Printf("TRACE: %s %v:%v: %s\n", time.Now().Format("01:04:05.000"), file, line, fmt.Sprint(dump(a...)...))
	}
}

// Tracef log
func Tracef(format string, a ...interface{}) {
	if level <= TRACE {
		_, path, line, _ := runtime.Caller(1)
		_, file := filepath.Split(path)
		fmt.Printf("TRACE: %s %v:%v: %s\n", time.Now().Format("01:04:05.000"), file, line, fmt.Sprintf(format, dump(a...)...))
	}
}

// Debug log
func Debug(a ...interface{}) {
	if level <= DEBUG {
		_, path, line, _ := runtime.Caller(1)
		_, file := filepath.Split(path)
		fmt.Printf("DEBUG: %s %v:%v: %s\n", time.Now().Format("01:04:05.000"), file, line, fmt.Sprint(dump(a...)...))
	}
}

// Debugf log
func Debugf(format string, a ...interface{}) {
	if level <= DEBUG {
		_, path, line, _ := runtime.Caller(1)
		_, file := filepath.Split(path)
		fmt.Printf("DEBUG: %s %v:%v: %s\n", time.Now().Format("01:04:05.000"), file, line, fmt.Sprintf(format, dump(a...)...))
	}
}

// Info log
func Info(a ...interface{}) {
	if level <= INFO {
		_, path, line, _ := runtime.Caller(1)
		_, file := filepath.Split(path)
		fmt.Printf("INFO: %s %v:%v: %s\n", time.Now().Format("01:04:05.000"), file, line, fmt.Sprint(dump(a...)...))
	}
}

// Infof log
func Infof(format string, a ...interface{}) {
	if level <= INFO {
		_, path, line, _ := runtime.Caller(1)
		_, file := filepath.Split(path)
		fmt.Printf("INFO: %s %v:%v: %s\n", time.Now().Format("01:04:05.000"), file, line, fmt.Sprintf(format, dump(a...)...))
	}
}

// Warning log
func Warning(a ...interface{}) {
	if level <= WARNING {
		_, path, line, _ := runtime.Caller(1)
		_, file := filepath.Split(path)
		fmt.Printf("WARN: %s %v:%v: %s\n", time.Now().Format("01:04:05.000"), file, line, fmt.Sprint(dump(a...)...))
	}
}

// Warningf log
func Warningf(format string, a ...interface{}) {
	if level <= WARNING {
		_, path, line, _ := runtime.Caller(1)
		_, file := filepath.Split(path)
		fmt.Printf("WARN: %s %v:%v: %s\n", time.Now().Format("01:04:05.000"), file, line, fmt.Sprintf(format, dump(a...)...))
	}
}

// Error log
func Error(a ...interface{}) {
	if level <= ERROR {
		_, path, line, _ := runtime.Caller(1)
		_, file := filepath.Split(path)
		fmt.Fprintf(os.Stderr, "ERROR: %s %v:%v: %s\n", time.Now().Format("01:04:05.000"), file, line, fmt.Sprint(dump(a...)...))
	}
}

// Errorf log
func Errorf(format string, a ...interface{}) {
	if level <= ERROR {
		_, path, line, _ := runtime.Caller(1)
		_, file := filepath.Split(path)
		fmt.Fprintf(os.Stderr, "ERROR: %s %v:%v: %s\n", time.Now().Format("01:04:05.000"), file, line, fmt.Sprintf(format, dump(a...)...))
	}
}