significant rewrite of wrapped logger

i always want traces emitted for a few reasons
- debugging. never know when something will break.
- at some point i'm gonna want to capture and replay sessions for
  testing purposes. the trace log will make that easier

cmd/echo/main.go

@@ -36,7 +36,28 @@ func main() {
 	defer l.Close()
 	wmLogger := watermill.NewStdLogger(false, false)
 
-	wrappedSlogger := logger.NewWrappedSlogger(os.Stdout, verbose)
+	traceFile, err := os.OpenFile("trace.log", os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
+	if err != nil {
+		log.Fatalf("couldn't open trace log: %s\n", err)
+	}
+
+	traceLogConfig := logger.LogConfig{
+		Writer: traceFile,
+		Format: "json",
+		Level:  -5,
+	}
+
+	stdoutLogConfig := logger.LogConfig{
+		Writer: os.Stdout,
+		Format: "text",
+		Level:  verbose,
+	}
+
+	wrappedSlogger := logger.NewWrappedSlogger(
+		traceLogConfig,
+		stdoutLogConfig,
+	)
+
 	router, err := message.NewRouter(message.RouterConfig{}, wrappedSlogger)
 
 	router.AddPlugin(plugin.SignalsHandler)
@@ -51,6 +72,8 @@ func main() {
 	ctx := context.Background()
 	ts := telnet.NewTELNETServer(ctx, l, pubSub, wrappedSlogger)
 	tp := telnet.NewTELNETParser(ctx, pubSub, wrappedSlogger)
+
+	wrappedSlogger.Info("booting up, welcome back formers", nil)
 	go tp.Handle()
 
 	for {

logger/wrappedslogger.go

@@ -23,42 +23,76 @@ func LogFieldsToSlogAttrs(in watermill.LogFields) []slog.Attr {
 }
 
 type WrappedSlogger struct {
-	*slog.Logger
+	loggers []*slog.Logger
 }
 
-func NewWrappedSlogger(w io.Writer, verbose int) *WrappedSlogger {
+type LogConfig struct {
+	Format string
+	Writer io.Writer
+	Level  int
+}
+
+func NewWrappedSlogger(configs ...LogConfig) *WrappedSlogger {
+
+	loggers := make([]*slog.Logger, 0)
+	for _, config := range configs {
+
 		opts := &slog.HandlerOptions{
-		Level: slog.Level(verbose),
+			Level: slog.Level(config.Level),
+		}
+
+		var handler slog.Handler
+
+		switch config.Format {
+		case "json":
+			handler = slog.NewJSONHandler(config.Writer, opts)
+		case "text":
+			handler = slog.NewTextHandler(config.Writer, opts)
+
 		}
-	handler := slog.NewTextHandler(w, opts)
+
+		loggers = append(loggers, slog.New(handler))
+	}
+
 	return &WrappedSlogger{
-		slog.New(handler),
+		loggers: loggers,
 	}
 }
 
 func (wl *WrappedSlogger) Error(msg string, err error, fields watermill.LogFields) {
 	attrs := LogFieldsToSlogAttrs(fields)
-	wl.LogAttrs(nil, LevelTrace, msg, attrs...)
+	for _, l := range wl.loggers {
+		l.LogAttrs(nil, slog.LevelError, msg, attrs...)
+	}
 }
 
 func (wl *WrappedSlogger) Info(msg string, fields watermill.LogFields) {
 	attrs := LogFieldsToSlogAttrs(fields)
-	wl.LogAttrs(nil, slog.LevelInfo, msg, attrs...)
+	for _, l := range wl.loggers {
+		l.LogAttrs(nil, slog.LevelInfo, msg, attrs...)
+	}
 }
 
 func (wl *WrappedSlogger) Debug(msg string, fields watermill.LogFields) {
 	attrs := LogFieldsToSlogAttrs(fields)
-	wl.LogAttrs(nil, slog.LevelDebug, msg, attrs...)
+	for _, l := range wl.loggers {
+		l.LogAttrs(nil, slog.LevelDebug, msg, attrs...)
+	}
 }
 
 func (wl *WrappedSlogger) Trace(msg string, fields watermill.LogFields) {
 	attrs := LogFieldsToSlogAttrs(fields)
-	wl.LogAttrs(nil, LevelTrace, msg, attrs...)
+	for _, l := range wl.loggers {
+		l.LogAttrs(nil, LevelTrace, msg, attrs...)
+	}
 }
 
 func (wl *WrappedSlogger) With(fields watermill.LogFields) watermill.LoggerAdapter {
 	attrs := LogFieldsToSlogAttrs(fields)
-	l := slog.Default().With(attrs)
+	newLoggers := make([]*slog.Logger, 0)
-	return &WrappedSlogger{l}
+	for _, l := range wl.loggers {
+		newLoggers = append(newLoggers, l.With(attrs))
+	}
+	return &WrappedSlogger{loggers: newLoggers}
 
 }