first

internal/grpc/client.go

@@ -0,0 +1,48 @@
+package grpc
+
+import (
+	"context"
+
+	pb "spektr/internal/grpc/pb"
+
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
+)
+
+type Client struct {
+	conn   *grpc.ClientConn
+	cancel context.CancelFunc
+	stream pb.ReceiverService_ConnectClient
+}
+
+func Dial(ctx context.Context, addr string) (*Client, error) {
+	conn, err := grpc.DialContext(ctx, addr, grpc.WithBlock(), grpc.WithTransportCredentials(insecure.NewCredentials()))
+	if err != nil {
+		return nil, err
+	}
+
+	client := pb.NewReceiverServiceClient(conn)
+	streamCtx, cancel := context.WithCancel(context.Background())
+	stream, err := client.Connect(streamCtx)
+	if err != nil {
+		cancel()
+		_ = conn.Close()
+		return nil, err
+	}
+
+	return &Client{conn: conn, cancel: cancel, stream: stream}, nil
+}
+
+func (c *Client) Send(msg *pb.ClientMessage) (*pb.ServerMessage, error) {
+	if err := c.stream.Send(msg); err != nil {
+		return nil, err
+	}
+	return c.stream.Recv()
+}
+
+func (c *Client) Close() error {
+	if c.cancel != nil {
+		c.cancel()
+	}
+	return c.conn.Close()
+}