fix: grpc transport can't be closed

transport/gun/transport_close.go

@@ -0,0 +1,35 @@
+package gun
+
+import (
+	"sync"
+	"unsafe"
+
+	"golang.org/x/net/http2"
+)
+
+type clientConnPool struct {
+	t     *http2.Transport
+	mu    sync.Mutex
+	conns map[string][]*http2.ClientConn // key is host:port
+}
+
+type efaceWords struct {
+	typ  unsafe.Pointer
+	data unsafe.Pointer
+}
+
+func (tw *TransportWrap) Close() error {
+	connPool := transportConnPool(tw.Transport)
+	p := (*clientConnPool)((*efaceWords)(unsafe.Pointer(&connPool)).data)
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	for _, vv := range p.conns {
+		for _, cc := range vv {
+			cc.Close()
+		}
+	}
+	return nil
+}
+
+//go:linkname transportConnPool golang.org/x/net/http2.(*Transport).connPool
+func transportConnPool(t *http2.Transport) http2.ClientConnPool