[client] add json gateway for netbird daemon (#6272)

* add json gateway for netbird daemon

* client: add optional daemon JSON socket gateway

client/proto/daemon_gateway_test.go

@@ -0,0 +1,80 @@
+package proto
+
+import (
+	"context"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	gatewayruntime "github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
+	"google.golang.org/grpc/test/bufconn"
+)
+
+func TestGatewayServerRoutesCoverDaemonRPCs(t *testing.T) {
+	mux := gatewayruntime.NewServeMux()
+	if err := RegisterDaemonServiceHandlerServer(context.Background(), mux, UnimplementedDaemonServiceServer{}); err != nil {
+		t.Fatalf("register daemon gateway server handlers: %v", err)
+	}
+
+	assertAllDaemonGatewayRoutesRegistered(t, mux)
+}
+
+func TestGatewayClientRoutesCoverDaemonRPCs(t *testing.T) {
+	listener := bufconn.Listen(1024 * 1024)
+	server := grpc.NewServer()
+	RegisterDaemonServiceServer(server, UnimplementedDaemonServiceServer{})
+	go func() {
+		if err := server.Serve(listener); err != nil && err != grpc.ErrServerStopped {
+			t.Errorf("serve bufconn gRPC server: %v", err)
+		}
+	}()
+	t.Cleanup(func() {
+		server.Stop()
+		_ = listener.Close()
+	})
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	mux := gatewayruntime.NewServeMux()
+	opts := []grpc.DialOption{
+		grpc.WithContextDialer(func(context.Context, string) (net.Conn, error) {
+			return listener.Dial()
+		}),
+		grpc.WithTransportCredentials(insecure.NewCredentials()),
+	}
+	if err := RegisterDaemonServiceHandlerFromEndpoint(ctx, mux, "passthrough:///bufnet", opts); err != nil {
+		t.Fatalf("register daemon gateway client handlers: %v", err)
+	}
+
+	assertAllDaemonGatewayRoutesRegistered(t, mux)
+}
+
+func assertAllDaemonGatewayRoutesRegistered(t *testing.T, mux http.Handler) {
+	t.Helper()
+	for _, method := range DaemonService_ServiceDesc.Methods {
+		assertGatewayRouteRegistered(t, mux, method.MethodName)
+	}
+	for _, stream := range DaemonService_ServiceDesc.Streams {
+		assertGatewayRouteRegistered(t, mux, stream.StreamName)
+	}
+}
+
+func assertGatewayRouteRegistered(t *testing.T, mux http.Handler, methodName string) {
+	t.Helper()
+
+	path := "/daemon.DaemonService/" + methodName
+	req := httptest.NewRequest(http.MethodPost, path, strings.NewReader("{}"))
+	req.Header.Set("Content-Type", "application/json")
+	res := httptest.NewRecorder()
+
+	mux.ServeHTTP(res, req)
+
+	if res.Code == http.StatusNotFound {
+		t.Fatalf("gateway route for %s is not registered", methodName)
+	}
+}

client/proto/generate.sh

@@ -12,5 +12,11 @@ script_path=$(dirname "$(realpath "$0")")
 cd "$script_path"
 go install google.golang.org/protobuf/cmd/protoc-gen-go@v1.36.6
 go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@v1.6.1
-protoc -I ./ ./daemon.proto --go_out=../ --go-grpc_out=../ --experimental_allow_proto3_optional
+go install github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-grpc-gateway@v2.26.3
+protoc -I ./ ./daemon.proto \
+  --go_out=../ \
+  --go-grpc_out=../ \
+  --grpc-gateway_out=../ \
+  --grpc-gateway_opt=generate_unbound_methods=true \
+  --experimental_allow_proto3_optional
 cd "$old_pwd"