// startFakeServerGossips creates local gossip instances and remote
// faked gossip instance. The remote gossip instance launches its
// faked gossip service just for check the client message.
func startFakeServerGossips(
	t *testing.T, localNodeID roachpb.NodeID,
) (*Gossip, *fakeGossipServer, *stop.Stopper) {
	stopper := stop.NewStopper()
	lRPCContext := rpc.NewContext(log.AmbientContext{}, &base.Config{Insecure: true}, nil, stopper)

	lserver := rpc.NewServer(lRPCContext)
	local := NewTest(localNodeID, lRPCContext, lserver, nil, stopper, metric.NewRegistry())
	lln, err := netutil.ListenAndServeGRPC(stopper, lserver, util.IsolatedTestAddr)
	if err != nil {
		t.Fatal(err)
	}
	local.start(lln.Addr())

	rRPCContext := rpc.NewContext(log.AmbientContext{}, &base.Config{Insecure: true}, nil, stopper)

	rserver := rpc.NewServer(rRPCContext)
	rln, err := netutil.ListenAndServeGRPC(stopper, rserver, util.IsolatedTestAddr)
	if err != nil {
		t.Fatal(err)
	}
	remote := newFakeGossipServer(rserver, stopper)
	addr := rln.Addr()
	remote.nodeAddr = util.MakeUnresolvedAddr(addr.Network(), addr.String())
	return local, remote, stopper
}

// createTestNode creates an rpc server using the specified address,
// gossip instance, KV database and a node using the specified slice
// of engines. The server, clock and node are returned. If gossipBS is
// not nil, the gossip bootstrap address is set to gossipBS.
func createTestNode(
	addr net.Addr, engines []engine.Engine, gossipBS net.Addr, t *testing.T,
) (*grpc.Server, net.Addr, *hlc.Clock, *Node, *stop.Stopper) {
	cfg := storage.StoreConfig{}

	stopper := stop.NewStopper()
	cfg.Clock = hlc.NewClock(hlc.UnixNano)
	nodeRPCContext := rpc.NewContext(log.AmbientContext{}, nodeTestBaseContext, cfg.Clock, stopper)
	cfg.ScanInterval = 10 * time.Hour
	cfg.ConsistencyCheckInterval = 10 * time.Hour
	grpcServer := rpc.NewServer(nodeRPCContext)
	serverCfg := makeTestConfig()
	cfg.Gossip = gossip.NewTest(
		0,
		nodeRPCContext,
		grpcServer,
		serverCfg.GossipBootstrapResolvers,
		stopper,
		metric.NewRegistry(),
	)
	ln, err := netutil.ListenAndServeGRPC(stopper, grpcServer, addr)
	if err != nil {
		t.Fatal(err)
	}
	if gossipBS != nil {
		// Handle possibility of a :0 port specification.
		if gossipBS.Network() == addr.Network() && gossipBS.String() == addr.String() {
			gossipBS = ln.Addr()
		}
		r, err := resolver.NewResolverFromAddress(gossipBS)
		if err != nil {
			t.Fatalf("bad gossip address %s: %s", gossipBS, err)
		}
		cfg.Gossip.SetResolvers([]resolver.Resolver{r})
		cfg.Gossip.Start(ln.Addr())
	}
	retryOpts := base.DefaultRetryOptions()
	retryOpts.Closer = stopper.ShouldQuiesce()
	distSender := kv.NewDistSender(kv.DistSenderConfig{
		Clock:           cfg.Clock,
		RPCContext:      nodeRPCContext,
		RPCRetryOptions: &retryOpts,
	}, cfg.Gossip)
	cfg.AmbientCtx.Tracer = tracing.NewTracer()
	sender := kv.NewTxnCoordSender(
		cfg.AmbientCtx,
		distSender,
		cfg.Clock,
		false,
		stopper,
		kv.MakeTxnMetrics(metric.TestSampleInterval),
	)
	cfg.DB = client.NewDB(sender)
	cfg.Transport = storage.NewDummyRaftTransport()
	cfg.MetricsSampleInterval = metric.TestSampleInterval
	node := NewNode(cfg, status.NewMetricsRecorder(cfg.Clock), metric.NewRegistry(), stopper,
		kv.MakeTxnMetrics(metric.TestSampleInterval), sql.MakeEventLogger(nil))
	roachpb.RegisterInternalServer(grpcServer, node)
	return grpcServer, ln.Addr(), cfg.Clock, node, stopper
}

func gossipSucceedsSoon(
	t *testing.T,
	stopper *stop.Stopper,
	disconnected chan *client,
	gossip map[*client]*Gossip,
	f func() error,
) {
	// Use an insecure context since we don't need a valid cert.
	rpcContext := rpc.NewContext(log.AmbientContext{}, &base.Config{Insecure: true}, nil, stopper)

	for c := range gossip {
		disconnected <- c
	}

	util.SucceedsSoon(t, func() error {
		select {
		case client := <-disconnected:
			// If the client wasn't able to connect, restart it.
			client.start(gossip[client], disconnected, rpcContext, stopper, gossip[client].NodeID.Get(), rpcContext.NewBreaker())
		default:
		}

		return f()
	})
}

func startGossipAtAddr(
	nodeID roachpb.NodeID,
	addr net.Addr,
	stopper *stop.Stopper,
	t *testing.T,
	registry *metric.Registry,
) *Gossip {
	rpcContext := rpc.NewContext(log.AmbientContext{}, &base.Config{Insecure: true}, nil, stopper)
	server := rpc.NewServer(rpcContext)
	g := NewTest(nodeID, rpcContext, server, nil, stopper, registry)
	ln, err := netutil.ListenAndServeGRPC(stopper, server, addr)
	if err != nil {
		t.Fatal(err)
	}
	addr = ln.Addr()
	if err := g.SetNodeDescriptor(&roachpb.NodeDescriptor{
		NodeID:  nodeID,
		Address: util.MakeUnresolvedAddr(addr.Network(), addr.String()),
	}); err != nil {
		t.Fatal(err)
	}
	g.start(addr)
	time.Sleep(time.Millisecond)
	return g
}

func newKVNative(b *testing.B) kvInterface {
	enableTracing := tracing.Disable()
	s, _, _ := serverutils.StartServer(b, base.TestServerArgs{})

	// TestServer.DB() returns the TxnCoordSender wrapped client. But that isn't
	// a fair comparison with SQL as we want these client requests to be sent
	// over the network.
	sender, err := client.NewSender(
		rpc.NewContext(log.AmbientContext{}, &base.Config{
			User:       security.NodeUser,
			SSLCA:      filepath.Join(security.EmbeddedCertsDir, security.EmbeddedCACert),
			SSLCert:    filepath.Join(security.EmbeddedCertsDir, "node.crt"),
			SSLCertKey: filepath.Join(security.EmbeddedCertsDir, "node.key"),
		}, nil, s.Stopper()),
		s.ServingAddr())
	if err != nil {
		b.Fatal(err)
	}

	return &kvNative{
		db: client.NewDB(sender),
		doneFn: func() {
			s.Stopper().Stop()
			enableTracing()
		},
	}
}

// NewNetwork creates nodeCount gossip nodes.
func NewNetwork(stopper *stop.Stopper, nodeCount int, createResolvers bool) *Network {
	log.Infof(context.TODO(), "simulating gossip network with %d nodes", nodeCount)

	n := &Network{
		Nodes:   []*Node{},
		Stopper: stopper,
	}
	n.rpcContext = rpc.NewContext(
		log.AmbientContext{},
		&base.Config{Insecure: true},
		hlc.NewClock(hlc.UnixNano, time.Nanosecond),
		n.Stopper,
	)
	var err error
	n.tlsConfig, err = n.rpcContext.GetServerTLSConfig()
	if err != nil {
		log.Fatal(context.TODO(), err)
	}

	for i := 0; i < nodeCount; i++ {
		node, err := n.CreateNode()
		if err != nil {
			log.Fatal(context.TODO(), err)
		}
		// Build a resolver for each instance or we'll get data races.
		if createResolvers {
			r, err := resolver.NewResolverFromAddress(n.Nodes[0].Addr())
			if err != nil {
				log.Fatalf(context.TODO(), "bad gossip address %s: %s", n.Nodes[0].Addr(), err)
			}
			node.Gossip.SetResolvers([]resolver.Resolver{r})
		}
	}
	return n
}

func TestSpanStatsGRPCResponse(t *testing.T) {
	defer leaktest.AfterTest(t)()
	ts := startServer(t)
	defer ts.Stopper().Stop()

	rpcStopper := stop.NewStopper()
	defer rpcStopper.Stop()
	rpcContext := rpc.NewContext(log.AmbientContext{}, ts.RPCContext().Config, ts.Clock(), rpcStopper)
	request := serverpb.SpanStatsRequest{
		NodeID:   "1",
		StartKey: []byte(roachpb.RKeyMin),
		EndKey:   []byte(roachpb.RKeyMax),
	}

	url := ts.ServingAddr()
	conn, err := rpcContext.GRPCDial(url)
	if err != nil {
		t.Fatal(err)
	}
	client := serverpb.NewStatusClient(conn)

	response, err := client.SpanStats(context.Background(), &request)
	if err != nil {
		t.Fatal(err)
	}
	if a, e := int(response.RangeCount), ExpectedInitialRangeCount(); a != e {
		t.Errorf("expected %d ranges, found %d", e, a)
	}
}

func newInsecureRPCContext(stopper *stop.Stopper) *rpc.Context {
	return rpc.NewContext(
		log.AmbientContext{},
		&base.Config{Insecure: true},
		hlc.NewClock(hlc.UnixNano, time.Nanosecond),
		stopper,
	)
}

// Start starts the test cluster by bootstrapping an in-memory store
// (defaults to maximum of 50M). The server is started, launching the
// node RPC server and all HTTP endpoints. Use the value of
// TestServer.Addr after Start() for client connections. Use Stop()
// to shutdown the server after the test completes.
func (ltc *LocalTestCluster) Start(t util.Tester, baseCtx *base.Config, initSender InitSenderFn) {
	ambient := log.AmbientContext{Tracer: tracing.NewTracer()}
	nc := &base.NodeIDContainer{}
	ambient.AddLogTag("n", nc)

	nodeID := roachpb.NodeID(1)
	nodeDesc := &roachpb.NodeDescriptor{NodeID: nodeID}

	ltc.tester = t
	ltc.Manual = hlc.NewManualClock(0)
	ltc.Clock = hlc.NewClock(ltc.Manual.UnixNano)
	ltc.Stopper = stop.NewStopper()
	rpcContext := rpc.NewContext(ambient, baseCtx, ltc.Clock, ltc.Stopper)
	server := rpc.NewServer(rpcContext) // never started
	ltc.Gossip = gossip.New(ambient, nc, rpcContext, server, nil, ltc.Stopper, metric.NewRegistry())
	ltc.Eng = engine.NewInMem(roachpb.Attributes{}, 50<<20)
	ltc.Stopper.AddCloser(ltc.Eng)

	ltc.Stores = storage.NewStores(ambient, ltc.Clock)

	ltc.Sender = initSender(nodeDesc, ambient.Tracer, ltc.Clock, ltc.Latency, ltc.Stores, ltc.Stopper,
		ltc.Gossip)
	if ltc.DBContext == nil {
		dbCtx := client.DefaultDBContext()
		ltc.DBContext = &dbCtx
	}
	ltc.DB = client.NewDBWithContext(ltc.Sender, *ltc.DBContext)
	transport := storage.NewDummyRaftTransport()
	cfg := storage.TestStoreConfig()
	if ltc.RangeRetryOptions != nil {
		cfg.RangeRetryOptions = *ltc.RangeRetryOptions
	}
	cfg.AmbientCtx = ambient
	cfg.Clock = ltc.Clock
	cfg.DB = ltc.DB
	cfg.Gossip = ltc.Gossip
	cfg.Transport = transport
	cfg.MetricsSampleInterval = metric.TestSampleInterval
	ltc.Store = storage.NewStore(cfg, ltc.Eng, nodeDesc)
	if err := ltc.Store.Bootstrap(roachpb.StoreIdent{NodeID: nodeID, StoreID: 1}); err != nil {
		t.Fatalf("unable to start local test cluster: %s", err)
	}
	ltc.Stores.AddStore(ltc.Store)
	if err := ltc.Store.BootstrapRange(nil); err != nil {
		t.Fatalf("unable to start local test cluster: %s", err)
	}
	if err := ltc.Store.Start(context.Background(), ltc.Stopper); err != nil {
		t.Fatalf("unable to start local test cluster: %s", err)
	}
	nc.Set(context.TODO(), nodeDesc.NodeID)
	if err := ltc.Gossip.SetNodeDescriptor(nodeDesc); err != nil {
		t.Fatalf("unable to set node descriptor: %s", err)
	}
}

// NewClient implements the Cluster interface.
func (f *Farmer) NewClient(t *testing.T, i int) (*client.DB, *stop.Stopper) {
	stopper := stop.NewStopper()
	rpcContext := rpc.NewContext(log.AmbientContext{}, &base.Config{
		Insecure: true,
		User:     security.NodeUser,
	}, nil, stopper)
	sender, err := client.NewSender(rpcContext, f.Addr(i, base.DefaultPort))
	if err != nil {
		t.Fatal(err)
	}
	return client.NewDB(sender), stopper
}

func createTestClientForUser(t *testing.T, stopper *stop.Stopper, addr, user string) *client.DB {
	var ctx base.Config
	ctx.InitDefaults()
	ctx.User = user
	ctx.SSLCA = filepath.Join(security.EmbeddedCertsDir, security.EmbeddedCACert)
	ctx.SSLCert = filepath.Join(security.EmbeddedCertsDir, fmt.Sprintf("%s.crt", user))
	ctx.SSLCertKey = filepath.Join(security.EmbeddedCertsDir, fmt.Sprintf("%s.key", user))
	sender, err := client.NewSender(rpc.NewContext(log.AmbientContext{}, &ctx, nil, stopper), addr)
	if err != nil {
		t.Fatal(err)
	}
	return client.NewDB(sender)
}

// NewClient implements the Cluster interface.
func (l *LocalCluster) NewClient(t *testing.T, i int) (*roachClient.DB, *stop.Stopper) {
	stopper := stop.NewStopper()
	rpcContext := rpc.NewContext(log.AmbientContext{}, &base.Config{
		User:       security.NodeUser,
		SSLCA:      filepath.Join(l.CertsDir, security.EmbeddedCACert),
		SSLCert:    filepath.Join(l.CertsDir, security.EmbeddedNodeCert),
		SSLCertKey: filepath.Join(l.CertsDir, security.EmbeddedNodeKey),
	}, hlc.NewClock(hlc.UnixNano, 0), stopper)
	conn, err := rpcContext.GRPCDial(l.Nodes[i].Addr(DefaultTCP).String())
	if err != nil {
		t.Fatal(err)
	}
	return roachClient.NewDB(roachClient.NewSender(conn)), stopper
}

func createTestClientForUser(
	t *testing.T, stopper *stop.Stopper, addr, user string, dbCtx client.DBContext,
) *client.DB {
	rpcContext := rpc.NewContext(log.AmbientContext{}, &base.Config{
		User:       user,
		SSLCA:      filepath.Join(security.EmbeddedCertsDir, security.EmbeddedCACert),
		SSLCert:    filepath.Join(security.EmbeddedCertsDir, fmt.Sprintf("%s.crt", user)),
		SSLCertKey: filepath.Join(security.EmbeddedCertsDir, fmt.Sprintf("%s.key", user)),
	}, nil, stopper)
	sender, err := client.NewSender(rpcContext, addr)
	if err != nil {
		t.Fatal(err)
	}
	return client.NewDBWithContext(sender, dbCtx)
}

func createTestClientForUser(
	t *testing.T, s serverutils.TestServerInterface, user string,
) *client.DB {
	var ctx base.Config
	ctx.InitDefaults()
	ctx.User = user
	ctx.SSLCA = filepath.Join(security.EmbeddedCertsDir, security.EmbeddedCACert)
	ctx.SSLCert = filepath.Join(security.EmbeddedCertsDir, fmt.Sprintf("%s.crt", user))
	ctx.SSLCertKey = filepath.Join(security.EmbeddedCertsDir, fmt.Sprintf("%s.key", user))
	conn, err := rpc.NewContext(log.AmbientContext{}, &ctx, s.Clock(), s.Stopper()).GRPCDial(s.ServingAddr())
	if err != nil {
		t.Fatal(err)
	}
	return client.NewDB(client.NewSender(conn))
}

func createTestClientForUser(
	t *testing.T, s serverutils.TestServerInterface, user string, dbCtx client.DBContext,
) *client.DB {
	rpcContext := rpc.NewContext(log.AmbientContext{}, &base.Config{
		User:       user,
		SSLCA:      filepath.Join(security.EmbeddedCertsDir, security.EmbeddedCACert),
		SSLCert:    filepath.Join(security.EmbeddedCertsDir, fmt.Sprintf("%s.crt", user)),
		SSLCertKey: filepath.Join(security.EmbeddedCertsDir, fmt.Sprintf("%s.key", user)),
	}, s.Clock(), s.Stopper())
	conn, err := rpcContext.GRPCDial(s.ServingAddr())
	if err != nil {
		t.Fatal(err)
	}
	return client.NewDBWithContext(client.NewSender(conn), dbCtx)
}

func newRaftTransportTestContext(t testing.TB) *raftTransportTestContext {
	rttc := &raftTransportTestContext{
		t:          t,
		stopper:    stop.NewStopper(),
		transports: map[roachpb.NodeID]*storage.RaftTransport{},
	}
	rttc.nodeRPCContext = rpc.NewContext(
		log.AmbientContext{}, testutils.NewNodeTestBaseContext(), nil, rttc.stopper,
	)
	server := rpc.NewServer(rttc.nodeRPCContext) // never started
	rttc.gossip = gossip.NewTest(
		1, rttc.nodeRPCContext, server, nil, rttc.stopper, metric.NewRegistry(),
	)
	return rttc
}

// TestClientRegisterInitNodeID verifies two client's gossip request with NodeID 0.
func TestClientRegisterWithInitNodeID(t *testing.T) {
	defer leaktest.AfterTest(t)()
	stopper := stop.NewStopper()
	defer stopper.Stop()

	// Create three gossip nodes, and connect to the first with NodeID 0.
	var g []*Gossip
	var gossipAddr string
	for i := 0; i < 3; i++ {
		RPCContext := rpc.NewContext(log.AmbientContext{}, &base.Config{Insecure: true}, nil, stopper)

		server := rpc.NewServer(RPCContext)
		ln, err := netutil.ListenAndServeGRPC(stopper, server, util.IsolatedTestAddr)
		if err != nil {
			t.Fatal(err)
		}

		// Connect to the first gossip node.
		if gossipAddr == "" {
			gossipAddr = ln.Addr().String()
		}

		var resolvers []resolver.Resolver
		resolver, err := resolver.NewResolver(gossipAddr)
		if err != nil {
			t.Fatal(err)
		}
		resolvers = append(resolvers, resolver)
		// node ID must be non-zero
		gnode := NewTest(
			roachpb.NodeID(i+1), RPCContext, server, resolvers, stopper, metric.NewRegistry(),
		)
		g = append(g, gnode)
		gnode.Start(ln.Addr())
	}

	util.SucceedsSoon(t, func() error {
		// The first gossip node should have two gossip client address
		// in nodeMap if these three gossip nodes registered success.
		g[0].mu.Lock()
		defer g[0].mu.Unlock()
		if a, e := len(g[0].mu.nodeMap), 2; a != e {
			return errors.Errorf("expected %s to contain %d nodes, got %d", g[0].mu.nodeMap, e, a)
		}
		return nil
	})
}

// TestGossipInfoStore verifies operation of gossip instance infostore.
func TestGossipInfoStore(t *testing.T) {
	defer leaktest.AfterTest(t)()
	stopper := stop.NewStopper()
	defer stopper.Stop()
	rpcContext := rpc.NewContext(log.AmbientContext{}, &base.Config{Insecure: true}, nil, stopper)
	g := NewTest(1, rpcContext, rpc.NewServer(rpcContext), nil, stopper, metric.NewRegistry())
	slice := []byte("b")
	if err := g.AddInfo("s", slice, time.Hour); err != nil {
		t.Fatal(err)
	}
	if val, err := g.GetInfo("s"); !bytes.Equal(val, slice) || err != nil {
		t.Errorf("error fetching string: %v", err)
	}
	if _, err := g.GetInfo("s2"); err == nil {
		t.Errorf("expected error fetching nonexistent key \"s2\"")
	}
}

// createTestStorePool creates a stopper, gossip and storePool for use in
// tests. Stopper must be stopped by the caller.
func createTestStorePool(
	timeUntilStoreDead time.Duration,
) (*stop.Stopper, *gossip.Gossip, *hlc.ManualClock, *StorePool) {
	stopper := stop.NewStopper()
	mc := hlc.NewManualClock(0)
	clock := hlc.NewClock(mc.UnixNano)
	rpcContext := rpc.NewContext(log.AmbientContext{}, &base.Config{Insecure: true}, clock, stopper)
	server := rpc.NewServer(rpcContext) // never started
	g := gossip.NewTest(1, rpcContext, server, nil, stopper, metric.NewRegistry())
	storePool := NewStorePool(
		log.AmbientContext{},
		g,
		clock,
		rpcContext,
		timeUntilStoreDead,
		stopper,
	)
	return stopper, g, mc, storePool
}

// Start starts a cluster. The numWorkers parameter controls the SQL connection
// settings to avoid unnecessary connection creation. The args parameter can be
// used to pass extra arguments to each node.
func (c *Cluster) Start(db string, numWorkers int, args, env []string) {
	c.started = timeutil.Now()

	baseCtx := &base.Config{
		User:     security.NodeUser,
		Insecure: true,
	}
	c.rpcCtx = rpc.NewContext(log.AmbientContext{}, baseCtx, nil, c.stopper)

	for i := range c.Nodes {
		c.Nodes[i] = c.makeNode(i, args, env)
		c.Clients[i] = c.makeClient(i)
		c.Status[i] = c.makeStatus(i)
		c.DB[i] = c.makeDB(i, numWorkers, db)
	}

	log.Infof(context.Background(), "started %.3fs", timeutil.Since(c.started).Seconds())
	c.waitForFullReplication()
}