Initial QSfera import

Server/vendor/github.com/thejerf/suture/v4/shim.go

@@ -0,0 +1,40 @@
+package suture
+
+import (
+	"context"
+)
+
+type DeprecatedService interface {
+	Serve()
+	Stop()
+}
+
+// AsService converts old-style suture service to a new style suture service.
+func AsService(service DeprecatedService) Service {
+	return &serviceShim{service: service}
+}
+
+type serviceShim struct {
+	service DeprecatedService
+}
+
+func (s *serviceShim) Serve(ctx context.Context) error {
+	done := make(chan struct{})
+	go func() {
+		s.service.Serve()
+		close(done)
+	}()
+
+	select {
+	case <-done:
+		// If the service stops by itself (done closes), return straight away, there is no error, and we don't need
+		// to wait for the context.
+		return nil
+	case <-ctx.Done():
+		// If the context is closed, stop the service, then wait for it's termination and return the error from the
+		// context.
+		s.service.Stop()
+		<-done
+		return ctx.Err()
+	}
+}