[#331] pool: Add mocked test tree service and check goroutine leak

Use real gRPC connection in new mocked tree service.

Signed-off-by: Alex Vanin <a.vanin@yadro.com>

pool/tree/pool_server_test.go

@@ -0,0 +1,234 @@
+package tree
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"net"
+	"runtime"
+	"strconv"
+	"testing"
+
+	apinetmap "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/api/netmap"
+	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
+	cidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id/test"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/netmap"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/pool"
+	tree "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/pool/tree/service"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/stretchr/testify/require"
+	"google.golang.org/grpc"
+)
+
+type mockTreeServer struct {
+	id  int
+	srv *grpc.Server
+	lis net.Listener
+	key *keys.PrivateKey
+
+	healthy    bool
+	addCounter int
+}
+
+type mockNetmapSource struct {
+	servers []*mockTreeServer
+	policy  string
+}
+
+func (m *mockNetmapSource) NetMapSnapshot(context.Context) (netmap.NetMap, error) {
+	nm := netmap.NetMap{}
+	nodes := make([]netmap.NodeInfo, len(m.servers))
+	for i, server := range m.servers {
+		ni := apinetmap.NodeInfo{}
+		ni.SetAddresses(server.lis.Addr().String())
+		ni.SetPublicKey(server.key.PublicKey().Bytes())
+		err := nodes[i].ReadFromV2(ni) // no other way to set address field in netmap.NodeInfo
+		if err != nil {
+			return nm, err
+		}
+		nodes[i].SetAttribute("id", strconv.Itoa(server.id))
+	}
+	nm.SetNodes(nodes)
+	return nm, nil
+}
+
+func (m *mockNetmapSource) PlacementPolicy(context.Context, cid.ID) (netmap.PlacementPolicy, error) {
+	p := netmap.PlacementPolicy{}
+	return p, p.DecodeString(m.policy)
+}
+
+func (m *mockTreeServer) Serve() {
+	go m.srv.Serve(m.lis)
+}
+
+func (m *mockTreeServer) Stop() {
+	m.srv.Stop()
+}
+
+func (m *mockTreeServer) Addr() string {
+	return m.lis.Addr().String()
+}
+
+func (m *mockTreeServer) Add(context.Context, *tree.AddRequest) (*tree.AddResponse, error) {
+	m.addCounter++
+	return &tree.AddResponse{}, nil
+}
+
+func (m *mockTreeServer) AddByPath(context.Context, *tree.AddByPathRequest) (*tree.AddByPathResponse, error) {
+	panic("implement me")
+}
+
+func (m *mockTreeServer) Remove(context.Context, *tree.RemoveRequest) (*tree.RemoveResponse, error) {
+	panic("implement me")
+}
+
+func (m *mockTreeServer) Move(context.Context, *tree.MoveRequest) (*tree.MoveResponse, error) {
+	panic("implement me")
+}
+
+func (m *mockTreeServer) GetNodeByPath(context.Context, *tree.GetNodeByPathRequest) (*tree.GetNodeByPathResponse, error) {
+	panic("implement me")
+}
+
+func (m *mockTreeServer) GetSubTree(*tree.GetSubTreeRequest, tree.TreeService_GetSubTreeServer) error {
+	panic("implement me")
+}
+
+func (m *mockTreeServer) TreeList(context.Context, *tree.TreeListRequest) (*tree.TreeListResponse, error) {
+	panic("implement me")
+}
+
+func (m *mockTreeServer) Apply(context.Context, *tree.ApplyRequest) (*tree.ApplyResponse, error) {
+	panic("implement me")
+}
+
+func (m *mockTreeServer) GetOpLog(*tree.GetOpLogRequest, tree.TreeService_GetOpLogServer) error {
+	panic("implement me")
+}
+
+func (m *mockTreeServer) Healthcheck(context.Context, *tree.HealthcheckRequest) (*tree.HealthcheckResponse, error) {
+	if m.healthy {
+		return new(tree.HealthcheckResponse), nil
+	}
+	return nil, errors.New("not healthy")
+}
+
+func createTestServer(t *testing.T, id int) *mockTreeServer {
+	lis, err := net.Listen("tcp", "127.0.0.1:0")
+	require.NoError(t, err)
+
+	key, err := keys.NewPrivateKey()
+	require.NoError(t, err)
+
+	res := &mockTreeServer{
+		id:      id,
+		srv:     grpc.NewServer(),
+		lis:     lis,
+		key:     key,
+		healthy: true,
+	}
+
+	tree.RegisterTreeServiceServer(res.srv, res)
+
+	return res
+}
+
+func preparePoolWithNetmapSource(t *testing.T, n int, p string) (*Pool, []*mockTreeServer, *mockNetmapSource) {
+	poolInitParams := InitParameters{}
+
+	servers := make([]*mockTreeServer, n)
+	for i := range servers {
+		servers[i] = createTestServer(t, i)
+		servers[i].healthy = true
+		servers[i].Serve()
+		poolInitParams.AddNode(pool.NewNodeParam(1, servers[i].Addr(), 1))
+	}
+
+	source := &mockNetmapSource{
+		servers: servers,
+		policy:  p,
+	}
+
+	key, err := keys.NewPrivateKey()
+	require.NoError(t, err)
+	poolInitParams.SetKey(key)
+	poolInitParams.SetNetMapInfoSource(source)
+
+	cli, err := NewPool(poolInitParams)
+	require.NoError(t, err)
+
+	return cli, servers, source
+}
+
+func sortServers(ctx context.Context, servers []*mockTreeServer, source *mockNetmapSource, cnr cid.ID) ([]*mockTreeServer, error) {
+	res := make([]*mockTreeServer, len(servers))
+	snapshot, err := source.NetMapSnapshot(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	policy, err := source.PlacementPolicy(ctx, cnr)
+	if err != nil {
+		return nil, err
+	}
+
+	cnrNodes, err := snapshot.ContainerNodes(policy, cnr[:])
+	if err != nil {
+		return nil, err
+	}
+
+	priorityNodes, err := snapshot.PlacementVectors(cnrNodes, cnr[:])
+	if err != nil {
+		return nil, err
+	}
+
+	// find servers based on public key and store pointers in res
+	for i := range priorityNodes {
+		for j := range priorityNodes[i] {
+			key := priorityNodes[i][j].PublicKey()
+			for k := range servers {
+				if bytes.Equal(servers[k].key.PublicKey().Bytes(), key) {
+					res[i+j] = servers[k]
+				}
+			}
+		}
+	}
+
+	return res, nil
+}
+
+func TestConnectionLeak(t *testing.T) {
+	const (
+		numberOfNodes   = 4
+		placementPolicy = "REP 2"
+	)
+
+	// Initialize gRPC servers and create pool with netmap source
+	treePool, servers, source := preparePoolWithNetmapSource(t, numberOfNodes, placementPolicy)
+	for i := range servers {
+		defer servers[i].Stop()
+	}
+
+	cnr := cidtest.ID()
+	ctx := context.Background()
+
+	// Make priority node for cnr unhealthy, so it is going to be redialled on every request
+	sortedServers, err := sortServers(ctx, servers, source, cnr)
+	require.NoError(t, err)
+	sortedServers[0].healthy = false
+
+	// Make RPC and check that pool switched to healthy server
+	_, err = treePool.AddNode(context.Background(), AddNodeParams{CID: cnr})
+	require.NoError(t, err)
+	require.Equal(t, 0, sortedServers[0].addCounter) // unhealthy
+	require.Equal(t, 1, sortedServers[1].addCounter) // healthy
+
+	// Check that go routines are not leaked during multiple requests
+	routinesBefore := runtime.NumGoroutine()
+	for i := 0; i < 1000; i++ {
+		_, err = treePool.AddNode(context.Background(), AddNodeParams{CID: cnr})
+		require.NoError(t, err)
+	}
+	// not more than 1 extra goroutine is created due to async operations
+	require.LessOrEqual(t, runtime.NumGoroutine()-routinesBefore, 1)
+}