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observable.go
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observable.go
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package log
import (
"context"
"io"
"os"
"time"
"github.com/sagernet/sing/common"
F "github.com/sagernet/sing/common/format"
"github.com/sagernet/sing/common/observable"
"github.com/sagernet/sing/service/filemanager"
)
var _ Factory = (*defaultFactory)(nil)
type defaultFactory struct {
ctx context.Context
formatter Formatter
platformFormatter Formatter
writer io.Writer
file *os.File
filePath string
platformWriter PlatformWriter
needObservable bool
level Level
subscriber *observable.Subscriber[Entry]
observer *observable.Observer[Entry]
}
func NewDefaultFactory(
ctx context.Context,
formatter Formatter,
writer io.Writer,
filePath string,
platformWriter PlatformWriter,
needObservable bool,
) ObservableFactory {
factory := &defaultFactory{
ctx: ctx,
formatter: formatter,
platformFormatter: Formatter{
BaseTime: formatter.BaseTime,
DisableLineBreak: true,
},
writer: writer,
filePath: filePath,
platformWriter: platformWriter,
needObservable: needObservable,
level: LevelTrace,
subscriber: observable.NewSubscriber[Entry](128),
}
if platformWriter != nil {
factory.platformFormatter.DisableColors = platformWriter.DisableColors()
}
if needObservable {
factory.observer = observable.NewObserver[Entry](factory.subscriber, 64)
}
return factory
}
func (f *defaultFactory) Start() error {
if f.filePath != "" {
logFile, err := filemanager.OpenFile(f.ctx, f.filePath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0o644)
if err != nil {
return err
}
f.writer = logFile
f.file = logFile
}
return nil
}
func (f *defaultFactory) Close() error {
return common.Close(
common.PtrOrNil(f.file),
f.subscriber,
)
}
func (f *defaultFactory) Level() Level {
return f.level
}
func (f *defaultFactory) SetLevel(level Level) {
f.level = level
}
func (f *defaultFactory) Logger() ContextLogger {
return f.NewLogger("")
}
func (f *defaultFactory) NewLogger(tag string) ContextLogger {
return &observableLogger{f, tag}
}
func (f *defaultFactory) Subscribe() (subscription observable.Subscription[Entry], done <-chan struct{}, err error) {
return f.observer.Subscribe()
}
func (f *defaultFactory) UnSubscribe(sub observable.Subscription[Entry]) {
f.observer.UnSubscribe(sub)
}
var _ ContextLogger = (*observableLogger)(nil)
type observableLogger struct {
*defaultFactory
tag string
}
func (l *observableLogger) Log(ctx context.Context, level Level, args []any) {
level = OverrideLevelFromContext(level, ctx)
if level > l.level {
return
}
nowTime := time.Now()
if l.needObservable {
message, messageSimple := l.formatter.FormatWithSimple(ctx, level, l.tag, F.ToString(args...), nowTime)
if level == LevelPanic {
panic(message)
}
l.writer.Write([]byte(message))
if level == LevelFatal {
os.Exit(1)
}
l.subscriber.Emit(Entry{level, messageSimple})
} else {
message := l.formatter.Format(ctx, level, l.tag, F.ToString(args...), nowTime)
if level == LevelPanic {
panic(message)
}
l.writer.Write([]byte(message))
if level == LevelFatal {
os.Exit(1)
}
}
if l.platformWriter != nil {
l.platformWriter.WriteMessage(level, l.platformFormatter.Format(ctx, level, l.tag, F.ToString(args...), nowTime))
}
}
func (l *observableLogger) Trace(args ...any) {
l.TraceContext(context.Background(), args...)
}
func (l *observableLogger) Debug(args ...any) {
l.DebugContext(context.Background(), args...)
}
func (l *observableLogger) Info(args ...any) {
l.InfoContext(context.Background(), args...)
}
func (l *observableLogger) Warn(args ...any) {
l.WarnContext(context.Background(), args...)
}
func (l *observableLogger) Error(args ...any) {
l.ErrorContext(context.Background(), args...)
}
func (l *observableLogger) Fatal(args ...any) {
l.FatalContext(context.Background(), args...)
}
func (l *observableLogger) Panic(args ...any) {
l.PanicContext(context.Background(), args...)
}
func (l *observableLogger) TraceContext(ctx context.Context, args ...any) {
l.Log(ctx, LevelTrace, args)
}
func (l *observableLogger) DebugContext(ctx context.Context, args ...any) {
l.Log(ctx, LevelDebug, args)
}
func (l *observableLogger) InfoContext(ctx context.Context, args ...any) {
l.Log(ctx, LevelInfo, args)
}
func (l *observableLogger) WarnContext(ctx context.Context, args ...any) {
l.Log(ctx, LevelWarn, args)
}
func (l *observableLogger) ErrorContext(ctx context.Context, args ...any) {
l.Log(ctx, LevelError, args)
}
func (l *observableLogger) FatalContext(ctx context.Context, args ...any) {
l.Log(ctx, LevelFatal, args)
}
func (l *observableLogger) PanicContext(ctx context.Context, args ...any) {
l.Log(ctx, LevelPanic, args)
}