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package logger
import (
"io"
"log"
"sync/atomic"
)
// LogSystem is implemented by log output devices.
// All methods can be called concurrently from multiple goroutines.
type LogSystem interface {
LogPrint(LogMsg)
}
// NewStdLogSystem creates a LogSystem that prints to the given writer.
// The flag values are defined package log.
func NewStdLogSystem(writer io.Writer, flags int, level LogLevel) *StdLogSystem {
logger := log.New(writer, "", flags)
return &StdLogSystem{logger, uint32(level)}
}
type StdLogSystem struct {
logger *log.Logger
level uint32
}
func (t *StdLogSystem) LogPrint(msg LogMsg) {
stdmsg, ok := msg.(stdMsg)
if ok {
if t.GetLogLevel() >= stdmsg.Level() {
t.logger.Print(stdmsg.String())
}
}
}
func (t *StdLogSystem) SetLogLevel(i LogLevel) {
atomic.StoreUint32(&t.level, uint32(i))
}
func (t *StdLogSystem) GetLogLevel() LogLevel {
return LogLevel(atomic.LoadUint32(&t.level))
}
// NewJSONLogSystem creates a LogSystem that prints to the given writer without
// adding extra information irrespective of loglevel only if message is JSON type
func NewJsonLogSystem(writer io.Writer) LogSystem {
logger := log.New(writer, "", 0)
return &jsonLogSystem{logger}
}
type jsonLogSystem struct {
logger *log.Logger
}
func (t *jsonLogSystem) LogPrint(msg LogMsg) {
jsonmsg, ok := msg.(jsonMsg)
if ok {
t.logger.Print(jsonmsg.String())
}
}
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