feat: add precise diagnostics and optional client copy logging controls

logx/timeZone.go

@@ -0,0 +1,40 @@
+package logx
+
+import (
+	"context"
+	"log/slog"
+	"time"
+
+	"git.yuntuo.hk/k2safe/go-omni/internal/configdiag"
+)
+
+func logLocation(name string) (*time.Location, error) {
+	if name == "" {
+		return nil, nil
+	}
+	location, err := time.LoadLocation(name)
+	if err != nil {
+		return nil, configdiag.Wrap("timeZone", "must be an available IANA time zone or UTC", err)
+	}
+	return location, nil
+}
+
+// Convert only the record timestamp. User time.Time attributes retain their
+// original locations; child loggers inherit this instance's location.
+type zoneHandler struct {
+	slog.Handler
+	location *time.Location
+}
+
+func (h zoneHandler) Handle(ctx context.Context, r slog.Record) error {
+	if !r.Time.IsZero() {
+		r.Time = r.Time.In(h.location)
+	}
+	return h.Handler.Handle(ctx, r)
+}
+func (h zoneHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
+	return zoneHandler{h.Handler.WithAttrs(attrs), h.location}
+}
+func (h zoneHandler) WithGroup(name string) slog.Handler {
+	return zoneHandler{h.Handler.WithGroup(name), h.location}
+}