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logger.go
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logger.go
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package log
import (
"github.com/configcat/go-sdk/v9"
"io"
"log"
"os"
)
type Level int
type Logger interface {
GetConfigCatLevel() configcat.LogLevel // for the SDK
Level() Level
WithLevel(level Level) Logger
WithPrefix(prefix string) Logger
Debugf(format string, args ...interface{})
Infof(format string, args ...interface{})
Warnf(format string, args ...interface{})
Errorf(format string, args ...interface{})
// Reportf logs regardless of level
Reportf(format string, args ...interface{})
}
const (
Debug Level = iota
Info
Warn
Error
None
)
type logger struct {
level Level
errorLogger *log.Logger
outLogger *log.Logger
prefix string
}
func NewNullLogger() Logger {
return &logger{level: None}
}
func NewDebugLogger() Logger {
return &logger{
level: Debug,
errorLogger: log.New(os.Stderr, "", log.Ldate),
outLogger: log.New(os.Stdout, "", log.Ldate),
}
}
func NewLogger(err io.Writer, out io.Writer, level Level) Logger {
return &logger{
level: level,
errorLogger: log.New(err, "", log.Ldate|log.Ltime|log.LUTC),
outLogger: log.New(out, "", log.Ldate|log.Ltime|log.LUTC),
}
}
func (l *logger) WithLevel(level Level) Logger {
return &logger{
level: level,
errorLogger: l.errorLogger,
outLogger: l.outLogger,
prefix: l.prefix,
}
}
func (l *logger) WithPrefix(prefix string) Logger {
if l.prefix != "" {
prefix = l.prefix + "/" + prefix
}
return &logger{
level: l.level,
errorLogger: l.errorLogger,
outLogger: l.outLogger,
prefix: prefix,
}
}
func (l *logger) GetConfigCatLevel() configcat.LogLevel {
switch l.level {
case Debug:
return configcat.LogLevelDebug
case Info:
return configcat.LogLevelInfo
case Warn:
return configcat.LogLevelWarn
case Error:
return configcat.LogLevelError
case None:
return configcat.LogLevelNone
default:
return configcat.LogLevelWarn
}
}
func (l *logger) Level() Level {
return l.level
}
func (l *logger) Debugf(format string, values ...interface{}) {
l.logf(Debug, format, values...)
}
func (l *logger) Infof(format string, values ...interface{}) {
l.logf(Info, format, values...)
}
func (l *logger) Warnf(format string, values ...interface{}) {
l.logf(Warn, format, values...)
}
func (l *logger) Errorf(format string, values ...interface{}) {
l.logf(Error, format, values...)
}
func (l *logger) Reportf(format string, values ...interface{}) {
if l.level == None {
return
}
pref := ""
if l.prefix != "" {
pref = "<" + l.prefix + ">"
}
if pref == "" {
l.outLogger.Printf(format, values...)
} else {
l.outLogger.Printf(pref+" "+format, values...)
}
}
func (l *logger) logf(level Level, format string, values ...interface{}) {
if level >= l.level {
var lo *log.Logger
if level == Error {
lo = l.errorLogger
} else {
lo = l.outLogger
}
pref := ""
if l.prefix != "" {
pref = " <" + l.prefix + ">"
}
lo.Printf(level.prefix()+pref+" "+format, values...)
}
}
func (level Level) prefix() string {
switch level {
case Debug:
return "[debug]"
case Info:
return "[info]"
case Warn:
return "[warning]"
case Error:
return "[error]"
case None:
return ""
}
return "-"
}