package consul

import (
	"bytes"
	"fmt"
	"os"
	"reflect"
	"testing"

	"time"

	"github.com/hashicorp/consul/api"
	"github.com/hashicorp/consul/consul/state"
	"github.com/hashicorp/consul/consul/structs"
	"github.com/hashicorp/consul/lib"
	"github.com/hashicorp/consul/types"
	"github.com/hashicorp/go-uuid"
	"github.com/hashicorp/raft"
)

type MockSink struct {
	*bytes.Buffer
	cancel bool
}

func (m *MockSink) ID() string {
	return "Mock"
}

func (m *MockSink) Cancel() error {
	m.cancel = true
	return nil
}

func (m *MockSink) Close() error {
	return nil
}

func makeLog(buf []byte) *raft.Log {
	return &raft.Log{
		Index: 1,
		Term:  1,
		Type:  raft.LogCommand,
		Data:  buf,
	}
}

func generateUUID() (ret string) {
	var err error
	if ret, err = uuid.GenerateUUID(); err != nil {
		panic(fmt.Sprintf("Unable to generate a UUID, %v", err))
	}
	return ret
}

func TestFSM_RegisterNode(t *testing.T) {
	t.Parallel()
	fsm, err := NewFSM(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	req := structs.RegisterRequest{
		Datacenter: "dc1",
		Node:       "foo",
		Address:    "127.0.0.1",
	}
	buf, err := structs.Encode(structs.RegisterRequestType, req)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	resp := fsm.Apply(makeLog(buf))
	if resp != nil {
		t.Fatalf("resp: %v", resp)
	}

	// Verify we are registered
	_, node, err := fsm.state.GetNode("foo")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if node == nil {
		t.Fatalf("not found!")
	}
	if node.ModifyIndex != 1 {
		t.Fatalf("bad index: %d", node.ModifyIndex)
	}

	// Verify service registered
	_, services, err := fsm.state.NodeServices(nil, "foo")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if len(services.Services) != 0 {
		t.Fatalf("Services: %v", services)
	}
}

func TestFSM_RegisterNode_Service(t *testing.T) {
	t.Parallel()
	fsm, err := NewFSM(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	req := structs.RegisterRequest{
		Datacenter: "dc1",
		Node:       "foo",
		Address:    "127.0.0.1",
		Service: &structs.NodeService{
			ID:      "db",
			Service: "db",
			Tags:    []string{"master"},
			Port:    8000,
		},
		Check: &structs.HealthCheck{
			Node:      "foo",
			CheckID:   "db",
			Name:      "db connectivity",
			Status:    api.HealthPassing,
			ServiceID: "db",
		},
	}
	buf, err := structs.Encode(structs.RegisterRequestType, req)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	resp := fsm.Apply(makeLog(buf))
	if resp != nil {
		t.Fatalf("resp: %v", resp)
	}

	// Verify we are registered
	_, node, err := fsm.state.GetNode("foo")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if node == nil {
		t.Fatalf("not found!")
	}

	// Verify service registered
	_, services, err := fsm.state.NodeServices(nil, "foo")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if _, ok := services.Services["db"]; !ok {
		t.Fatalf("not registered!")
	}

	// Verify check
	_, checks, err := fsm.state.NodeChecks(nil, "foo")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if checks[0].CheckID != "db" {
		t.Fatalf("not registered!")
	}
}

func TestFSM_DeregisterService(t *testing.T) {
	t.Parallel()
	fsm, err := NewFSM(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	req := structs.RegisterRequest{
		Datacenter: "dc1",
		Node:       "foo",
		Address:    "127.0.0.1",
		Service: &structs.NodeService{
			ID:      "db",
			Service: "db",
			Tags:    []string{"master"},
			Port:    8000,
		},
	}
	buf, err := structs.Encode(structs.RegisterRequestType, req)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	resp := fsm.Apply(makeLog(buf))
	if resp != nil {
		t.Fatalf("resp: %v", resp)
	}

	dereg := structs.DeregisterRequest{
		Datacenter: "dc1",
		Node:       "foo",
		ServiceID:  "db",
	}
	buf, err = structs.Encode(structs.DeregisterRequestType, dereg)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	resp = fsm.Apply(makeLog(buf))
	if resp != nil {
		t.Fatalf("resp: %v", resp)
	}

	// Verify we are registered
	_, node, err := fsm.state.GetNode("foo")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if node == nil {
		t.Fatalf("not found!")
	}

	// Verify service not registered
	_, services, err := fsm.state.NodeServices(nil, "foo")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if _, ok := services.Services["db"]; ok {
		t.Fatalf("db registered!")
	}
}

func TestFSM_DeregisterCheck(t *testing.T) {
	t.Parallel()
	fsm, err := NewFSM(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	req := structs.RegisterRequest{
		Datacenter: "dc1",
		Node:       "foo",
		Address:    "127.0.0.1",
		Check: &structs.HealthCheck{
			Node:    "foo",
			CheckID: "mem",
			Name:    "memory util",
			Status:  api.HealthPassing,
		},
	}
	buf, err := structs.Encode(structs.RegisterRequestType, req)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	resp := fsm.Apply(makeLog(buf))
	if resp != nil {
		t.Fatalf("resp: %v", resp)
	}

	dereg := structs.DeregisterRequest{
		Datacenter: "dc1",
		Node:       "foo",
		CheckID:    "mem",
	}
	buf, err = structs.Encode(structs.DeregisterRequestType, dereg)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	resp = fsm.Apply(makeLog(buf))
	if resp != nil {
		t.Fatalf("resp: %v", resp)
	}

	// Verify we are registered
	_, node, err := fsm.state.GetNode("foo")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if node == nil {
		t.Fatalf("not found!")
	}

	// Verify check not registered
	_, checks, err := fsm.state.NodeChecks(nil, "foo")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if len(checks) != 0 {
		t.Fatalf("check registered!")
	}
}

func TestFSM_DeregisterNode(t *testing.T) {
	t.Parallel()
	fsm, err := NewFSM(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	req := structs.RegisterRequest{
		Datacenter: "dc1",
		Node:       "foo",
		Address:    "127.0.0.1",
		Service: &structs.NodeService{
			ID:      "db",
			Service: "db",
			Tags:    []string{"master"},
			Port:    8000,
		},
		Check: &structs.HealthCheck{
			Node:      "foo",
			CheckID:   "db",
			Name:      "db connectivity",
			Status:    api.HealthPassing,
			ServiceID: "db",
		},
	}
	buf, err := structs.Encode(structs.RegisterRequestType, req)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	resp := fsm.Apply(makeLog(buf))
	if resp != nil {
		t.Fatalf("resp: %v", resp)
	}

	dereg := structs.DeregisterRequest{
		Datacenter: "dc1",
		Node:       "foo",
	}
	buf, err = structs.Encode(structs.DeregisterRequestType, dereg)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	resp = fsm.Apply(makeLog(buf))
	if resp != nil {
		t.Fatalf("resp: %v", resp)
	}

	// Verify we are not registered
	_, node, err := fsm.state.GetNode("foo")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if node != nil {
		t.Fatalf("found!")
	}

	// Verify service not registered
	_, services, err := fsm.state.NodeServices(nil, "foo")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if services != nil {
		t.Fatalf("Services: %v", services)
	}

	// Verify checks not registered
	_, checks, err := fsm.state.NodeChecks(nil, "foo")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if len(checks) != 0 {
		t.Fatalf("Services: %v", services)
	}
}

func TestFSM_SnapshotRestore(t *testing.T) {
	t.Parallel()
	fsm, err := NewFSM(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	// Add some state
	fsm.state.EnsureNode(1, &structs.Node{Node: "foo", Address: "127.0.0.1"})
	fsm.state.EnsureNode(2, &structs.Node{Node: "baz", Address: "127.0.0.2", TaggedAddresses: map[string]string{"hello": "1.2.3.4"}})
	fsm.state.EnsureService(3, "foo", &structs.NodeService{ID: "web", Service: "web", Tags: nil, Address: "127.0.0.1", Port: 80})
	fsm.state.EnsureService(4, "foo", &structs.NodeService{ID: "db", Service: "db", Tags: []string{"primary"}, Address: "127.0.0.1", Port: 5000})
	fsm.state.EnsureService(5, "baz", &structs.NodeService{ID: "web", Service: "web", Tags: nil, Address: "127.0.0.2", Port: 80})
	fsm.state.EnsureService(6, "baz", &structs.NodeService{ID: "db", Service: "db", Tags: []string{"secondary"}, Address: "127.0.0.2", Port: 5000})
	fsm.state.EnsureCheck(7, &structs.HealthCheck{
		Node:      "foo",
		CheckID:   "web",
		Name:      "web connectivity",
		Status:    api.HealthPassing,
		ServiceID: "web",
	})
	fsm.state.KVSSet(8, &structs.DirEntry{
		Key:   "/test",
		Value: []byte("foo"),
	})
	session := &structs.Session{ID: generateUUID(), Node: "foo"}
	fsm.state.SessionCreate(9, session)
	acl := &structs.ACL{ID: generateUUID(), Name: "User Token"}
	fsm.state.ACLSet(10, acl)

	fsm.state.KVSSet(11, &structs.DirEntry{
		Key:   "/remove",
		Value: []byte("foo"),
	})
	fsm.state.KVSDelete(12, "/remove")
	idx, _, err := fsm.state.KVSList(nil, "/remove")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if idx != 12 {
		t.Fatalf("bad index: %d", idx)
	}

	updates := structs.Coordinates{
		&structs.Coordinate{
			Node:  "baz",
			Coord: generateRandomCoordinate(),
		},
		&structs.Coordinate{
			Node:  "foo",
			Coord: generateRandomCoordinate(),
		},
	}
	if err := fsm.state.CoordinateBatchUpdate(13, updates); err != nil {
		t.Fatalf("err: %s", err)
	}

	query := structs.PreparedQuery{
		ID: generateUUID(),
		Service: structs.ServiceQuery{
			Service: "web",
		},
		RaftIndex: structs.RaftIndex{
			CreateIndex: 14,
			ModifyIndex: 14,
		},
	}
	if err := fsm.state.PreparedQuerySet(14, &query); err != nil {
		t.Fatalf("err: %s", err)
	}

	autopilotConf := &structs.AutopilotConfig{
		CleanupDeadServers:   true,
		LastContactThreshold: 100 * time.Millisecond,
		MaxTrailingLogs:      222,
	}
	if err := fsm.state.AutopilotSetConfig(15, autopilotConf); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Snapshot
	snap, err := fsm.Snapshot()
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	defer snap.Release()

	// Persist
	buf := bytes.NewBuffer(nil)
	sink := &MockSink{buf, false}
	if err := snap.Persist(sink); err != nil {
		t.Fatalf("err: %v", err)
	}

	// Try to restore on a new FSM
	fsm2, err := NewFSM(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	// Do a restore
	if err := fsm2.Restore(sink); err != nil {
		t.Fatalf("err: %v", err)
	}

	// Verify the contents
	_, nodes, err := fsm2.state.Nodes(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if len(nodes) != 2 {
		t.Fatalf("bad: %v", nodes)
	}
	if nodes[0].Node != "baz" ||
		nodes[0].Address != "127.0.0.2" ||
		len(nodes[0].TaggedAddresses) != 1 ||
		nodes[0].TaggedAddresses["hello"] != "1.2.3.4" {
		t.Fatalf("bad: %v", nodes[0])
	}
	if nodes[1].Node != "foo" ||
		nodes[1].Address != "127.0.0.1" ||
		len(nodes[1].TaggedAddresses) != 0 {
		t.Fatalf("bad: %v", nodes[1])
	}

	_, fooSrv, err := fsm2.state.NodeServices(nil, "foo")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if len(fooSrv.Services) != 2 {
		t.Fatalf("Bad: %v", fooSrv)
	}
	if !lib.StrContains(fooSrv.Services["db"].Tags, "primary") {
		t.Fatalf("Bad: %v", fooSrv)
	}
	if fooSrv.Services["db"].Port != 5000 {
		t.Fatalf("Bad: %v", fooSrv)
	}

	_, checks, err := fsm2.state.NodeChecks(nil, "foo")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if len(checks) != 1 {
		t.Fatalf("Bad: %v", checks)
	}

	// Verify key is set
	_, d, err := fsm2.state.KVSGet(nil, "/test")
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if string(d.Value) != "foo" {
		t.Fatalf("bad: %v", d)
	}

	// Verify session is restored
	idx, s, err := fsm2.state.SessionGet(nil, session.ID)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if s.Node != "foo" {
		t.Fatalf("bad: %v", s)
	}
	if idx <= 1 {
		t.Fatalf("bad index: %d", idx)
	}

	// Verify ACL is restored
	_, a, err := fsm2.state.ACLGet(nil, acl.ID)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if a.Name != "User Token" {
		t.Fatalf("bad: %v", a)
	}
	if a.ModifyIndex <= 1 {
		t.Fatalf("bad index: %d", idx)
	}

	// Verify tombstones are restored
	func() {
		snap := fsm2.state.Snapshot()
		defer snap.Close()
		stones, err := snap.Tombstones()
		if err != nil {
			t.Fatalf("err: %s", err)
		}
		stone := stones.Next().(*state.Tombstone)
		if stone == nil {
			t.Fatalf("missing tombstone")
		}
		if stone.Key != "/remove" || stone.Index != 12 {
			t.Fatalf("bad: %v", stone)
		}
		if stones.Next() != nil {
			t.Fatalf("unexpected extra tombstones")
		}
	}()

	// Verify coordinates are restored
	_, coords, err := fsm2.state.Coordinates(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if !reflect.DeepEqual(coords, updates) {
		t.Fatalf("bad: %#v", coords)
	}

	// Verify queries are restored.
	_, queries, err := fsm2.state.PreparedQueryList(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if len(queries) != 1 {
		t.Fatalf("bad: %#v", queries)
	}
	if !reflect.DeepEqual(queries[0], &query) {
		t.Fatalf("bad: %#v", queries[0])
	}

	// Verify autopilot config is restored.
	_, restoredConf, err := fsm2.state.AutopilotConfig()
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if !reflect.DeepEqual(restoredConf, autopilotConf) {
		t.Fatalf("bad: %#v, %#v", restoredConf, autopilotConf)
	}

	// Snapshot
	snap, err = fsm2.Snapshot()
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	defer snap.Release()

	// Persist
	buf = bytes.NewBuffer(nil)
	sink = &MockSink{buf, false}
	if err := snap.Persist(sink); err != nil {
		t.Fatalf("err: %v", err)
	}

	// Try to restore on the old FSM and make sure it abandons the old state
	// store.
	abandonCh := fsm.state.AbandonCh()
	if err := fsm.Restore(sink); err != nil {
		t.Fatalf("err: %v", err)
	}
	select {
	case <-abandonCh:
	default:
		t.Fatalf("bad")
	}

}

func TestFSM_BadRestore(t *testing.T) {
	t.Parallel()
	// Create an FSM with some state.
	fsm, err := NewFSM(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	fsm.state.EnsureNode(1, &structs.Node{Node: "foo", Address: "127.0.0.1"})
	abandonCh := fsm.state.AbandonCh()

	// Do a bad restore.
	buf := bytes.NewBuffer([]byte("bad snapshot"))
	sink := &MockSink{buf, false}
	if err := fsm.Restore(sink); err == nil {
		t.Fatalf("err: %v", err)
	}

	// Verify the contents didn't get corrupted.
	_, nodes, err := fsm.state.Nodes(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if len(nodes) != 1 {
		t.Fatalf("bad: %v", nodes)
	}
	if nodes[0].Node != "foo" ||
		nodes[0].Address != "127.0.0.1" ||
		len(nodes[0].TaggedAddresses) != 0 {
		t.Fatalf("bad: %v", nodes[0])
	}

	// Verify the old state store didn't get abandoned.
	select {
	case <-abandonCh:
		t.Fatalf("bad")
	default:
	}
}

func TestFSM_KVSDelete(t *testing.T) {
	t.Parallel()
	fsm, err := NewFSM(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	req := structs.KVSRequest{
		Datacenter: "dc1",
		Op:         api.KVSet,
		DirEnt: structs.DirEntry{
			Key:   "/test/path",
			Flags: 0,
			Value: []byte("test"),
		},
	}
	buf, err := structs.Encode(structs.KVSRequestType, req)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	resp := fsm.Apply(makeLog(buf))
	if resp != nil {
		t.Fatalf("resp: %v", resp)
	}

	// Run the delete
	req.Op = api.KVDelete
	buf, err = structs.Encode(structs.KVSRequestType, req)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	resp = fsm.Apply(makeLog(buf))
	if resp != nil {
		t.Fatalf("resp: %v", resp)
	}

	// Verify key is not set
	_, d, err := fsm.state.KVSGet(nil, "/test/path")
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if d != nil {
		t.Fatalf("key present")
	}
}

func TestFSM_KVSDeleteTree(t *testing.T) {
	t.Parallel()
	fsm, err := NewFSM(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	req := structs.KVSRequest{
		Datacenter: "dc1",
		Op:         api.KVSet,
		DirEnt: structs.DirEntry{
			Key:   "/test/path",
			Flags: 0,
			Value: []byte("test"),
		},
	}
	buf, err := structs.Encode(structs.KVSRequestType, req)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	resp := fsm.Apply(makeLog(buf))
	if resp != nil {
		t.Fatalf("resp: %v", resp)
	}

	// Run the delete tree
	req.Op = api.KVDeleteTree
	req.DirEnt.Key = "/test"
	buf, err = structs.Encode(structs.KVSRequestType, req)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	resp = fsm.Apply(makeLog(buf))
	if resp != nil {
		t.Fatalf("resp: %v", resp)
	}

	// Verify key is not set
	_, d, err := fsm.state.KVSGet(nil, "/test/path")
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if d != nil {
		t.Fatalf("key present")
	}
}

func TestFSM_KVSDeleteCheckAndSet(t *testing.T) {
	t.Parallel()
	fsm, err := NewFSM(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	req := structs.KVSRequest{
		Datacenter: "dc1",
		Op:         api.KVSet,
		DirEnt: structs.DirEntry{
			Key:   "/test/path",
			Flags: 0,
			Value: []byte("test"),
		},
	}
	buf, err := structs.Encode(structs.KVSRequestType, req)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	resp := fsm.Apply(makeLog(buf))
	if resp != nil {
		t.Fatalf("resp: %v", resp)
	}

	// Verify key is set
	_, d, err := fsm.state.KVSGet(nil, "/test/path")
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if d == nil {
		t.Fatalf("key missing")
	}

	// Run the check-and-set
	req.Op = api.KVDeleteCAS
	req.DirEnt.ModifyIndex = d.ModifyIndex
	buf, err = structs.Encode(structs.KVSRequestType, req)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	resp = fsm.Apply(makeLog(buf))
	if resp.(bool) != true {
		t.Fatalf("resp: %v", resp)
	}

	// Verify key is gone
	_, d, err = fsm.state.KVSGet(nil, "/test/path")
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if d != nil {
		t.Fatalf("bad: %v", d)
	}
}

func TestFSM_KVSCheckAndSet(t *testing.T) {
	t.Parallel()
	fsm, err := NewFSM(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	req := structs.KVSRequest{
		Datacenter: "dc1",
		Op:         api.KVSet,
		DirEnt: structs.DirEntry{
			Key:   "/test/path",
			Flags: 0,
			Value: []byte("test"),
		},
	}
	buf, err := structs.Encode(structs.KVSRequestType, req)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	resp := fsm.Apply(makeLog(buf))
	if resp != nil {
		t.Fatalf("resp: %v", resp)
	}

	// Verify key is set
	_, d, err := fsm.state.KVSGet(nil, "/test/path")
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if d == nil {
		t.Fatalf("key missing")
	}

	// Run the check-and-set
	req.Op = api.KVCAS
	req.DirEnt.ModifyIndex = d.ModifyIndex
	req.DirEnt.Value = []byte("zip")
	buf, err = structs.Encode(structs.KVSRequestType, req)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	resp = fsm.Apply(makeLog(buf))
	if resp.(bool) != true {
		t.Fatalf("resp: %v", resp)
	}

	// Verify key is updated
	_, d, err = fsm.state.KVSGet(nil, "/test/path")
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if string(d.Value) != "zip" {
		t.Fatalf("bad: %v", d)
	}
}

func TestFSM_CoordinateUpdate(t *testing.T) {
	t.Parallel()
	fsm, err := NewFSM(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	// Register some nodes.
	fsm.state.EnsureNode(1, &structs.Node{Node: "node1", Address: "127.0.0.1"})
	fsm.state.EnsureNode(2, &structs.Node{Node: "node2", Address: "127.0.0.1"})

	// Write a batch of two coordinates.
	updates := structs.Coordinates{
		&structs.Coordinate{
			Node:  "node1",
			Coord: generateRandomCoordinate(),
		},
		&structs.Coordinate{
			Node:  "node2",
			Coord: generateRandomCoordinate(),
		},
	}
	buf, err := structs.Encode(structs.CoordinateBatchUpdateType, updates)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	resp := fsm.Apply(makeLog(buf))
	if resp != nil {
		t.Fatalf("resp: %v", resp)
	}

	// Read back the two coordinates to make sure they got updated.
	_, coords, err := fsm.state.Coordinates(nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if !reflect.DeepEqual(coords, updates) {
		t.Fatalf("bad: %#v", coords)
	}
}

func TestFSM_SessionCreate_Destroy(t *testing.T) {
	t.Parallel()
	fsm, err := NewFSM(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	fsm.state.EnsureNode(1, &structs.Node{Node: "foo", Address: "127.0.0.1"})
	fsm.state.EnsureCheck(2, &structs.HealthCheck{
		Node:    "foo",
		CheckID: "web",
		Status:  api.HealthPassing,
	})

	// Create a new session
	req := structs.SessionRequest{
		Datacenter: "dc1",
		Op:         structs.SessionCreate,
		Session: structs.Session{
			ID:     generateUUID(),
			Node:   "foo",
			Checks: []types.CheckID{"web"},
		},
	}
	buf, err := structs.Encode(structs.SessionRequestType, req)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	resp := fsm.Apply(makeLog(buf))
	if err, ok := resp.(error); ok {
		t.Fatalf("resp: %v", err)
	}

	// Get the session
	id := resp.(string)
	_, session, err := fsm.state.SessionGet(nil, id)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if session == nil {
		t.Fatalf("missing")
	}

	// Verify the session
	if session.ID != id {
		t.Fatalf("bad: %v", *session)
	}
	if session.Node != "foo" {
		t.Fatalf("bad: %v", *session)
	}
	if session.Checks[0] != "web" {
		t.Fatalf("bad: %v", *session)
	}

	// Try to destroy
	destroy := structs.SessionRequest{
		Datacenter: "dc1",
		Op:         structs.SessionDestroy,
		Session: structs.Session{
			ID: id,
		},
	}
	buf, err = structs.Encode(structs.SessionRequestType, destroy)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	resp = fsm.Apply(makeLog(buf))
	if resp != nil {
		t.Fatalf("resp: %v", resp)
	}

	_, session, err = fsm.state.SessionGet(nil, id)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if session != nil {
		t.Fatalf("should be destroyed")
	}
}

func TestFSM_KVSLock(t *testing.T) {
	t.Parallel()
	fsm, err := NewFSM(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	fsm.state.EnsureNode(1, &structs.Node{Node: "foo", Address: "127.0.0.1"})
	session := &structs.Session{ID: generateUUID(), Node: "foo"}
	fsm.state.SessionCreate(2, session)

	req := structs.KVSRequest{
		Datacenter: "dc1",
		Op:         api.KVLock,
		DirEnt: structs.DirEntry{
			Key:     "/test/path",
			Value:   []byte("test"),
			Session: session.ID,
		},
	}
	buf, err := structs.Encode(structs.KVSRequestType, req)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	resp := fsm.Apply(makeLog(buf))
	if resp != true {
		t.Fatalf("resp: %v", resp)
	}

	// Verify key is locked
	_, d, err := fsm.state.KVSGet(nil, "/test/path")
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if d == nil {
		t.Fatalf("missing")
	}
	if d.LockIndex != 1 {
		t.Fatalf("bad: %v", *d)
	}
	if d.Session != session.ID {
		t.Fatalf("bad: %v", *d)
	}
}

func TestFSM_KVSUnlock(t *testing.T) {
	t.Parallel()
	fsm, err := NewFSM(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	fsm.state.EnsureNode(1, &structs.Node{Node: "foo", Address: "127.0.0.1"})
	session := &structs.Session{ID: generateUUID(), Node: "foo"}
	fsm.state.SessionCreate(2, session)

	req := structs.KVSRequest{
		Datacenter: "dc1",
		Op:         api.KVLock,
		DirEnt: structs.DirEntry{
			Key:     "/test/path",
			Value:   []byte("test"),
			Session: session.ID,
		},
	}
	buf, err := structs.Encode(structs.KVSRequestType, req)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	resp := fsm.Apply(makeLog(buf))
	if resp != true {
		t.Fatalf("resp: %v", resp)
	}

	req = structs.KVSRequest{
		Datacenter: "dc1",
		Op:         api.KVUnlock,
		DirEnt: structs.DirEntry{
			Key:     "/test/path",
			Value:   []byte("test"),
			Session: session.ID,
		},
	}
	buf, err = structs.Encode(structs.KVSRequestType, req)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	resp = fsm.Apply(makeLog(buf))
	if resp != true {
		t.Fatalf("resp: %v", resp)
	}

	// Verify key is unlocked
	_, d, err := fsm.state.KVSGet(nil, "/test/path")
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if d == nil {
		t.Fatalf("missing")
	}
	if d.LockIndex != 1 {
		t.Fatalf("bad: %v", *d)
	}
	if d.Session != "" {
		t.Fatalf("bad: %v", *d)
	}
}

func TestFSM_ACL_Set_Delete(t *testing.T) {
	t.Parallel()
	fsm, err := NewFSM(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	// Create a new ACL
	req := structs.ACLRequest{
		Datacenter: "dc1",
		Op:         structs.ACLSet,
		ACL: structs.ACL{
			ID:   generateUUID(),
			Name: "User token",
			Type: structs.ACLTypeClient,
		},
	}
	buf, err := structs.Encode(structs.ACLRequestType, req)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	resp := fsm.Apply(makeLog(buf))
	if err, ok := resp.(error); ok {
		t.Fatalf("resp: %v", err)
	}

	// Get the ACL
	id := resp.(string)
	_, acl, err := fsm.state.ACLGet(nil, id)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if acl == nil {
		t.Fatalf("missing")
	}

	// Verify the ACL
	if acl.ID != id {
		t.Fatalf("bad: %v", *acl)
	}
	if acl.Name != "User token" {
		t.Fatalf("bad: %v", *acl)
	}
	if acl.Type != structs.ACLTypeClient {
		t.Fatalf("bad: %v", *acl)
	}

	// Try to destroy
	destroy := structs.ACLRequest{
		Datacenter: "dc1",
		Op:         structs.ACLDelete,
		ACL: structs.ACL{
			ID: id,
		},
	}
	buf, err = structs.Encode(structs.ACLRequestType, destroy)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	resp = fsm.Apply(makeLog(buf))
	if resp != nil {
		t.Fatalf("resp: %v", resp)
	}

	_, acl, err = fsm.state.ACLGet(nil, id)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if acl != nil {
		t.Fatalf("should be destroyed")
	}
}

func TestFSM_PreparedQuery_CRUD(t *testing.T) {
	t.Parallel()
	fsm, err := NewFSM(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	// Register a service to query on.
	fsm.state.EnsureNode(1, &structs.Node{Node: "foo", Address: "127.0.0.1"})
	fsm.state.EnsureService(2, "foo", &structs.NodeService{ID: "web", Service: "web", Tags: nil, Address: "127.0.0.1", Port: 80})

	// Create a new query.
	query := structs.PreparedQueryRequest{
		Op: structs.PreparedQueryCreate,
		Query: &structs.PreparedQuery{
			ID: generateUUID(),
			Service: structs.ServiceQuery{
				Service: "web",
			},
		},
	}
	{
		buf, err := structs.Encode(structs.PreparedQueryRequestType, query)
		if err != nil {
			t.Fatalf("err: %v", err)
		}
		resp := fsm.Apply(makeLog(buf))
		if resp != nil {
			t.Fatalf("resp: %v", resp)
		}
	}

	// Verify it's in the state store.
	{
		_, actual, err := fsm.state.PreparedQueryGet(nil, query.Query.ID)
		if err != nil {
			t.Fatalf("err: %s", err)
		}

		actual.CreateIndex, actual.ModifyIndex = 0, 0
		if !reflect.DeepEqual(actual, query.Query) {
			t.Fatalf("bad: %v", actual)
		}
	}

	// Make an update to the query.
	query.Op = structs.PreparedQueryUpdate
	query.Query.Name = "my-query"
	{
		buf, err := structs.Encode(structs.PreparedQueryRequestType, query)
		if err != nil {
			t.Fatalf("err: %v", err)
		}
		resp := fsm.Apply(makeLog(buf))
		if resp != nil {
			t.Fatalf("resp: %v", resp)
		}
	}

	// Verify the update.
	{
		_, actual, err := fsm.state.PreparedQueryGet(nil, query.Query.ID)
		if err != nil {
			t.Fatalf("err: %s", err)
		}

		actual.CreateIndex, actual.ModifyIndex = 0, 0
		if !reflect.DeepEqual(actual, query.Query) {
			t.Fatalf("bad: %v", actual)
		}
	}

	// Delete the query.
	query.Op = structs.PreparedQueryDelete
	{
		buf, err := structs.Encode(structs.PreparedQueryRequestType, query)
		if err != nil {
			t.Fatalf("err: %v", err)
		}
		resp := fsm.Apply(makeLog(buf))
		if resp != nil {
			t.Fatalf("resp: %v", resp)
		}
	}

	// Make sure it's gone.
	{
		_, actual, err := fsm.state.PreparedQueryGet(nil, query.Query.ID)
		if err != nil {
			t.Fatalf("err: %s", err)
		}

		if actual != nil {
			t.Fatalf("bad: %v", actual)
		}
	}
}

func TestFSM_TombstoneReap(t *testing.T) {
	t.Parallel()
	fsm, err := NewFSM(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	// Create some tombstones
	fsm.state.KVSSet(11, &structs.DirEntry{
		Key:   "/remove",
		Value: []byte("foo"),
	})
	fsm.state.KVSDelete(12, "/remove")
	idx, _, err := fsm.state.KVSList(nil, "/remove")
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if idx != 12 {
		t.Fatalf("bad index: %d", idx)
	}

	// Create a new reap request
	req := structs.TombstoneRequest{
		Datacenter: "dc1",
		Op:         structs.TombstoneReap,
		ReapIndex:  12,
	}
	buf, err := structs.Encode(structs.TombstoneRequestType, req)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	resp := fsm.Apply(makeLog(buf))
	if err, ok := resp.(error); ok {
		t.Fatalf("resp: %v", err)
	}

	// Verify the tombstones are gone
	snap := fsm.state.Snapshot()
	defer snap.Close()
	stones, err := snap.Tombstones()
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if stones.Next() != nil {
		t.Fatalf("unexpected extra tombstones")
	}
}

func TestFSM_Txn(t *testing.T) {
	t.Parallel()
	fsm, err := NewFSM(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	// Set a key using a transaction.
	req := structs.TxnRequest{
		Datacenter: "dc1",
		Ops: structs.TxnOps{
			&structs.TxnOp{
				KV: &structs.TxnKVOp{
					Verb: api.KVSet,
					DirEnt: structs.DirEntry{
						Key:   "/test/path",
						Flags: 0,
						Value: []byte("test"),
					},
				},
			},
		},
	}
	buf, err := structs.Encode(structs.TxnRequestType, req)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	resp := fsm.Apply(makeLog(buf))
	if _, ok := resp.(structs.TxnResponse); !ok {
		t.Fatalf("bad response type: %T", resp)
	}

	// Verify key is set directly in the state store.
	_, d, err := fsm.state.KVSGet(nil, "/test/path")
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if d == nil {
		t.Fatalf("missing")
	}
}

func TestFSM_Autopilot(t *testing.T) {
	t.Parallel()
	fsm, err := NewFSM(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	// Set the autopilot config using a request.
	req := structs.AutopilotSetConfigRequest{
		Datacenter: "dc1",
		Config: structs.AutopilotConfig{
			CleanupDeadServers:   true,
			LastContactThreshold: 10 * time.Second,
			MaxTrailingLogs:      300,
		},
	}
	buf, err := structs.Encode(structs.AutopilotRequestType, req)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	resp := fsm.Apply(makeLog(buf))
	if _, ok := resp.(error); ok {
		t.Fatalf("bad: %v", resp)
	}

	// Verify key is set directly in the state store.
	_, config, err := fsm.state.AutopilotConfig()
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if config.CleanupDeadServers != req.Config.CleanupDeadServers {
		t.Fatalf("bad: %v", config.CleanupDeadServers)
	}
	if config.LastContactThreshold != req.Config.LastContactThreshold {
		t.Fatalf("bad: %v", config.LastContactThreshold)
	}
	if config.MaxTrailingLogs != req.Config.MaxTrailingLogs {
		t.Fatalf("bad: %v", config.MaxTrailingLogs)
	}

	// Now use CAS and provide an old index
	req.CAS = true
	req.Config.CleanupDeadServers = false
	req.Config.ModifyIndex = config.ModifyIndex - 1
	buf, err = structs.Encode(structs.AutopilotRequestType, req)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	resp = fsm.Apply(makeLog(buf))
	if _, ok := resp.(error); ok {
		t.Fatalf("bad: %v", resp)
	}

	_, config, err = fsm.state.AutopilotConfig()
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if !config.CleanupDeadServers {
		t.Fatalf("bad: %v", config.CleanupDeadServers)
	}
}

func TestFSM_IgnoreUnknown(t *testing.T) {
	t.Parallel()
	fsm, err := NewFSM(nil, os.Stderr)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	// Create a new reap request
	type UnknownRequest struct {
		Foo string
	}
	req := UnknownRequest{Foo: "bar"}
	msgType := structs.IgnoreUnknownTypeFlag | 64
	buf, err := structs.Encode(msgType, req)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	// Apply should work, even though not supported
	resp := fsm.Apply(makeLog(buf))
	if err, ok := resp.(error); ok {
		t.Fatalf("resp: %v", err)
	}
}