feat 初次提交

net/grpc/resolver/resolver_mgr.go

@@ -0,0 +1,35 @@
+package resolver
+
+import (
+	"google.golang.org/grpc"
+	"sync"
+)
+
+var (
+	mu   = sync.RWMutex{}
+	conn = make(map[string]*grpc.ClientConn)
+)
+
+func GetGrpcClientConn(target string) (*grpc.ClientConn, error) {
+	mu.RLock()
+	if c, ok := conn[target]; ok && c != nil {
+		mu.RUnlock()
+		return c, nil
+	}
+	mu.RUnlock()
+
+	mu.Lock()
+	defer mu.Unlock()
+
+	if c, ok := conn[target]; ok && c != nil {
+		return c, nil
+	}
+
+	newConn, err := NewGrpcConnection(target)
+	if err != nil {
+		return nil, err
+	}
+
+	conn[target] = newConn
+	return newConn, nil
+}