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package logging
import (
"io"
"log"
)
type Logger interface {
Print(v ...interface{})
Printf(format string, v ...interface{})
Println(v ...interface{})
}
type NopLogger struct{}
func (NopLogger) Print(v ...interface{}) {}
func (NopLogger) Printf(format string, v ...interface{}) {}
func (NopLogger) Println(v ...interface{}) {}
type Level int
const (
LQuiet Level = iota
LError
LWarn
LInfo
LDebug
)
type Log struct {
err, warn, info, debug Logger
}
func (l Log) Error() Logger { return l.err }
func (l Log) Warn() Logger { return l.warn }
func (l Log) Info() Logger { return l.info }
func (l Log) Debug() Logger { return l.debug }
func buildLogger(out io.Writer, prefix string, lWant, lHave Level) Logger {
if lWant <= lHave {
return log.New(out, prefix, log.LstdFlags)
} else {
return NopLogger{}
}
}
func NewLog(out io.Writer, level Level) *Log {
l := new(Log)
l.err = buildLogger(out, "[Err]", LError, level)
l.warn = buildLogger(out, "[Warn]", LWarn, level)
l.info = buildLogger(out, "[Info]", LInfo, level)
l.debug = buildLogger(out, "[Debug]", LDebug, level)
return l
}
// NewNopLog creates a logger that is completly silent / doesn't log on any log level
func NewNopLog() *Log {
return &Log{
NopLogger{},
NopLogger{},
NopLogger{},
NopLogger{},
}
}
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