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otel_log.go
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otel_log.go
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package otellog
import (
"fmt"
"io"
"sync"
"time"
)
type Logger interface {
Log(level LogLevel, msg fmt.Stringer)
}
type LogLevel int
const (
// LogLevelTrace is used to for fine-grained debugging event and disabled in default configurations.
LogLevelTrace LogLevel = iota + 1
// LogLevelDebug is usually only enabled when debugging.
LogLevelDebug
// LogLevelInfo is used only for informal event indicates that event has happened.
LogLevelInfo
// LogLevelWarn is non-critical entries that deserve eyes.
LogLevelWarn
// LogLevelError is used for errors that should definitely be noted.
LogLevelError
// LogLevelError is used for fatal errors such as application or system crash.
LogLevelFatal
)
func (ll LogLevel) String() string {
switch ll {
case LogLevelTrace:
return "TRACE"
case LogLevelDebug:
return "DEBUG"
case LogLevelInfo:
return "INFO"
case LogLevelWarn:
return "WARN"
case LogLevelError:
return "ERROR"
case LogLevelFatal:
return "FATAL"
default:
return fmt.Sprintf("UNKNOWNLOGLEVEL<%d>", ll)
}
}
func NewDefaultLogger(w io.Writer, minLogLevel LogLevel) Logger {
return &defaultLogger{w: w, minLevel: minLogLevel}
}
type defaultLogger struct {
mu sync.Mutex
w io.Writer
minLevel LogLevel
}
func (l *defaultLogger) Log(ll LogLevel, msg fmt.Stringer) {
if ll < l.minLevel {
return
}
l.mu.Lock()
defer l.mu.Unlock()
_, _ = fmt.Fprintf(l.w, "%s\t[%s]\t%s\n", time.Now().Format(time.RFC3339), ll, msg)
}
var NullLogger = nullLogger{}
type nullLogger struct{}
func (nl nullLogger) Log(ll LogLevel, msg fmt.Stringer) {
}