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logger.go
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logger.go
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package cio
import (
"fmt"
"log"
"os"
)
//Logger is pkg/log Logger with prefixing and 2 log levels
type Logger struct {
Info, Debug bool
//internal
prefix string
logger *log.Logger
info, debug *bool
}
func NewLogger(prefix string) *Logger {
return NewLoggerFlag(prefix, log.Ldate|log.Ltime)
}
func NewLoggerFlag(prefix string, flag int) *Logger {
l := &Logger{
prefix: prefix,
logger: log.New(os.Stderr, "", flag),
Info: false,
Debug: false,
}
return l
}
func (l *Logger) Infof(f string, args ...interface{}) {
if l.IsInfo() {
l.logger.Printf(l.prefix+": "+f, args...)
}
}
func (l *Logger) Debugf(f string, args ...interface{}) {
if l.IsDebug() {
l.logger.Printf(l.prefix+": "+f, args...)
}
}
func (l *Logger) Errorf(f string, args ...interface{}) error {
return fmt.Errorf(l.prefix+": "+f, args...)
}
func (l *Logger) Fork(prefix string, args ...interface{}) *Logger {
//slip the parent prefix at the front
args = append([]interface{}{l.prefix}, args...)
ll := NewLogger(fmt.Sprintf("%s: "+prefix, args...))
//store link to parent settings too
ll.Info = l.Info
if l.info != nil {
ll.info = l.info
} else {
ll.info = &l.Info
}
ll.Debug = l.Debug
if l.debug != nil {
ll.debug = l.debug
} else {
ll.debug = &l.Debug
}
return ll
}
func (l *Logger) Prefix() string {
return l.prefix
}
func (l *Logger) IsInfo() bool {
return l.Info || (l.info != nil && *l.info)
}
func (l *Logger) IsDebug() bool {
return l.Debug || (l.debug != nil && *l.debug)
}