// BootstrapCluster bootstraps a multiple stores using the provided engines and
// cluster ID. The first bootstrapped store contains a single range spanning
// all keys. Initial range lookup metadata is populated for the range.
//
// Returns a KV client for unittest purposes. Caller should close the returned
// client.
func BootstrapCluster(clusterID string, engines []engine.Engine, stopper *stop.Stopper) (*client.DB, error) {
	ctx := storage.StoreContext{}
	ctx.ScanInterval = 10 * time.Minute
	ctx.Clock = hlc.NewClock(hlc.UnixNano)
	// Create a KV DB with a local sender.
	stores := storage.NewStores(ctx.Clock)
	sender := kv.NewTxnCoordSender(stores, ctx.Clock, false, nil, stopper)
	ctx.DB = client.NewDB(sender)
	ctx.Transport = storage.NewLocalRPCTransport(stopper)
	for i, eng := range engines {
		sIdent := roachpb.StoreIdent{
			ClusterID: clusterID,
			NodeID:    1,
			StoreID:   roachpb.StoreID(i + 1),
		}

		// The bootstrapping store will not connect to other nodes so its
		// StoreConfig doesn't really matter.
		s := storage.NewStore(ctx, eng, &roachpb.NodeDescriptor{NodeID: 1})

		// Verify the store isn't already part of a cluster.
		if len(s.Ident.ClusterID) > 0 {
			return nil, util.Errorf("storage engine already belongs to a cluster (%s)", s.Ident.ClusterID)
		}

		// Bootstrap store to persist the store ident.
		if err := s.Bootstrap(sIdent, stopper); err != nil {
			return nil, err
		}
		// Create first range, writing directly to engine. Note this does
		// not create the range, just its data.  Only do this if this is the
		// first store.
		if i == 0 {
			initialValues := GetBootstrapSchema().GetInitialValues()
			if err := s.BootstrapRange(initialValues); err != nil {
				return nil, err
			}
		}
		if err := s.Start(stopper); err != nil {
			return nil, err
		}

		stores.AddStore(s)

		// Initialize node and store ids.  Only initialize the node once.
		if i == 0 {
			if nodeID, err := allocateNodeID(ctx.DB); nodeID != sIdent.NodeID || err != nil {
				return nil, util.Errorf("expected to initialize node id allocator to %d, got %d: %s",
					sIdent.NodeID, nodeID, err)
			}
		}
		if storeID, err := allocateStoreIDs(sIdent.NodeID, 1, ctx.DB); storeID != sIdent.StoreID || err != nil {
			return nil, util.Errorf("expected to initialize store id allocator to %d, got %d: %s",
				sIdent.StoreID, storeID, err)
		}
	}
	return ctx.DB, nil
}

// 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) (
	*rpc.Server, net.Addr, *hlc.Clock, *Node, *stop.Stopper) {
	ctx := storage.StoreContext{}

	stopper := stop.NewStopper()
	ctx.Clock = hlc.NewClock(hlc.UnixNano)
	nodeRPCContext := rpc.NewContext(nodeTestBaseContext, ctx.Clock, stopper)
	ctx.ScanInterval = 10 * time.Hour
	rpcServer := rpc.NewServer(nodeRPCContext)
	grpcServer := grpc.NewServer()
	tlsConfig, err := nodeRPCContext.GetServerTLSConfig()
	if err != nil {
		t.Fatal(err)
	}
	ln, err := util.ListenAndServe(stopper, grpcutil.GRPCHandlerFunc(grpcServer, rpcServer), addr, tlsConfig)
	if err != nil {
		t.Fatal(err)
	}
	g := gossip.New(nodeRPCContext, testContext.GossipBootstrapResolvers, stopper)
	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)
		}
		g.SetResolvers([]resolver.Resolver{r})
		g.Start(grpcServer, ln.Addr())
	}
	ctx.Gossip = g
	retryOpts := kv.GetDefaultDistSenderRetryOptions()
	retryOpts.Closer = stopper.ShouldDrain()
	distSender := kv.NewDistSender(&kv.DistSenderContext{
		Clock:           ctx.Clock,
		RPCContext:      nodeRPCContext,
		RPCRetryOptions: &retryOpts,
	}, g)
	tracer := tracing.NewTracer()
	sender := kv.NewTxnCoordSender(distSender, ctx.Clock, false, tracer, stopper)
	ctx.DB = client.NewDB(sender)
	// TODO(bdarnell): arrange to have the transport closed.
	// (or attach LocalRPCTransport.Close to the stopper)
	ctx.Transport = storage.NewLocalRPCTransport(stopper)
	ctx.EventFeed = util.NewFeed(stopper)
	ctx.Tracer = tracer
	node := NewNode(ctx, metric.NewRegistry(), stopper, nil)
	return rpcServer, ln.Addr(), ctx.Clock, node, 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) (
	*rpc.Server, net.Addr, *hlc.Clock, *Node, *stop.Stopper) {
	ctx := storage.StoreContext{}

	stopper := stop.NewStopper()
	ctx.Clock = hlc.NewClock(hlc.UnixNano)
	nodeRPCContext := rpc.NewContext(nodeTestBaseContext, ctx.Clock, stopper)
	ctx.ScanInterval = 10 * time.Hour
	rpcServer := rpc.NewServer(nodeRPCContext)
	tlsConfig, err := nodeRPCContext.GetServerTLSConfig()
	if err != nil {
		t.Fatal(err)
	}
	ln, err := util.ListenAndServe(stopper, rpcServer, addr, tlsConfig)
	if err != nil {
		t.Fatal(err)
	}
	g := gossip.New(nodeRPCContext, testContext.GossipBootstrapResolvers)
	if gossipBS != nil {
		// Handle possibility of a :0 port specification.
		if gossipBS == addr {
			gossipBS = ln.Addr()
		}
		r, err := resolver.NewResolverFromAddress(gossipBS)
		if err != nil {
			t.Fatalf("bad gossip address %s: %s", gossipBS, err)
		}
		g.SetResolvers([]resolver.Resolver{r})
		g.Start(rpcServer, ln.Addr(), stopper)
	}
	ctx.Gossip = g
	sender := kv.NewDistSender(&kv.DistSenderContext{Clock: ctx.Clock, RPCContext: nodeRPCContext}, g)
	ctx.DB = client.NewDB(sender)
	// TODO(bdarnell): arrange to have the transport closed.
	// (or attach LocalRPCTransport.Close to the stopper)
	ctx.Transport = storage.NewLocalRPCTransport(stopper)
	ctx.EventFeed = util.NewFeed(stopper)
	node := NewNode(ctx, metric.NewRegistry(), stopper)
	return rpcServer, ln.Addr(), ctx.Clock, node, 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) {

	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(testutils.NewNodeTestBaseContext(), ltc.Clock, ltc.Stopper)
	ltc.Gossip = gossip.New(rpcContext, gossip.TestBootstrap)
	ltc.Eng = engine.NewInMem(roachpb.Attributes{}, 50<<20, ltc.Stopper)

	ltc.stores = storage.NewStores(ltc.Clock)
	var rpcSend rpcSendFn = func(_ rpc.Options, _ string, _ []net.Addr,
		getArgs func(addr net.Addr) proto.Message, getReply func() proto.Message,
		_ *rpc.Context) ([]proto.Message, error) {
		// TODO(tschottdorf): remove getReply().
		if ltc.Latency > 0 {
			time.Sleep(ltc.Latency)
		}
		br, pErr := ltc.stores.Send(context.Background(), *getArgs(nil).(*roachpb.BatchRequest))
		if br == nil {
			br = &roachpb.BatchResponse{}
		}
		if br.Error != nil {
			panic(roachpb.ErrorUnexpectedlySet(ltc.stores, br))
		}
		br.Error = pErr
		return []proto.Message{br}, nil
	}
	ltc.distSender = NewDistSender(&DistSenderContext{
		Clock: ltc.Clock,
		RangeDescriptorCacheSize: defaultRangeDescriptorCacheSize,
		RangeLookupMaxRanges:     defaultRangeLookupMaxRanges,
		LeaderCacheSize:          defaultLeaderCacheSize,
		RPCRetryOptions:          &defaultRPCRetryOptions,
		nodeDescriptor:           nodeDesc,
		RPCSend:                  rpcSend,    // defined above
		RangeDescriptorDB:        ltc.stores, // for descriptor lookup
	}, ltc.Gossip)

	ltc.Sender = NewTxnCoordSender(ltc.distSender, ltc.Clock, false /* !linearizable */, nil /* tracer */, ltc.Stopper)
	ltc.DB = client.NewDB(ltc.Sender)

	transport := storage.NewLocalRPCTransport(ltc.Stopper)
	ltc.Stopper.AddCloser(transport)
	ctx := storage.TestStoreContext
	ctx.Clock = ltc.Clock
	ctx.DB = ltc.DB
	ctx.Gossip = ltc.Gossip
	ctx.Transport = transport
	ltc.Store = storage.NewStore(ctx, ltc.Eng, nodeDesc)
	if err := ltc.Store.Bootstrap(roachpb.StoreIdent{NodeID: nodeID, StoreID: 1}, ltc.Stopper); 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(ltc.Stopper); err != nil {
		t.Fatalf("unable to start local test cluster: %s", err)
	}
	ltc.Gossip.SetNodeID(nodeDesc.NodeID)
	if err := ltc.Gossip.SetNodeDescriptor(nodeDesc); err != nil {
		t.Fatalf("unable to set node descriptor: %s", err)
	}
}

// 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) {
	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(testutils.NewNodeTestBaseContext(), ltc.Clock, ltc.Stopper)
	ltc.Gossip = gossip.New(rpcContext, gossip.TestBootstrap, ltc.Stopper)
	ltc.Eng = engine.NewInMem(roachpb.Attributes{}, 50<<20, ltc.Stopper)

	ltc.stores = storage.NewStores(ltc.Clock)
	tracer := tracing.NewTracer()
	var rpcSend rpcSendFn = func(_ SendOptions, _ ReplicaSlice,
		args roachpb.BatchRequest, _ *rpc.Context) (proto.Message, error) {
		if ltc.Latency > 0 {
			time.Sleep(ltc.Latency)
		}
		sp := tracer.StartSpan("node")
		defer sp.Finish()
		ctx, _ := opentracing.ContextWithSpan(context.Background(), sp)
		sp.LogEvent(args.String())
		br, pErr := ltc.stores.Send(ctx, args)
		if br == nil {
			br = &roachpb.BatchResponse{}
		}
		if br.Error != nil {
			panic(roachpb.ErrorUnexpectedlySet(ltc.stores, br))
		}
		br.Error = pErr
		if pErr != nil {
			sp.LogEvent("error: " + pErr.String())
		}
		return br, nil
	}
	retryOpts := GetDefaultDistSenderRetryOptions()
	retryOpts.Closer = ltc.Stopper.ShouldDrain()
	ltc.distSender = NewDistSender(&DistSenderContext{
		Clock: ltc.Clock,
		RangeDescriptorCacheSize: defaultRangeDescriptorCacheSize,
		RangeLookupMaxRanges:     defaultRangeLookupMaxRanges,
		LeaderCacheSize:          defaultLeaderCacheSize,
		RPCRetryOptions:          &retryOpts,
		nodeDescriptor:           nodeDesc,
		RPCSend:                  rpcSend,    // defined above
		RangeDescriptorDB:        ltc.stores, // for descriptor lookup
	}, ltc.Gossip)

	ltc.Sender = NewTxnCoordSender(ltc.distSender, ltc.Clock, false /* !linearizable */, tracer, ltc.Stopper)
	ltc.DB = client.NewDB(ltc.Sender)
	transport := storage.NewLocalRPCTransport(ltc.Stopper)
	ltc.Stopper.AddCloser(transport)
	ctx := storage.TestStoreContext
	ctx.Clock = ltc.Clock
	ctx.DB = ltc.DB
	ctx.Gossip = ltc.Gossip
	ctx.Transport = transport
	ctx.Tracer = tracer
	ltc.Store = storage.NewStore(ctx, ltc.Eng, nodeDesc)
	if err := ltc.Store.Bootstrap(roachpb.StoreIdent{NodeID: nodeID, StoreID: 1}, ltc.Stopper); 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(ltc.Stopper); err != nil {
		t.Fatalf("unable to start local test cluster: %s", err)
	}
	ltc.Gossip.SetNodeID(nodeDesc.NodeID)
	if err := ltc.Gossip.SetNodeDescriptor(nodeDesc); err != nil {
		t.Fatalf("unable to set node descriptor: %s", err)
	}
}