package agent

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"io/ioutil"
	"net"
	"os"
	"path/filepath"
	"reflect"
	"sync/atomic"
	"testing"
	"time"

	"github.com/hashicorp/consul/consul"
	"github.com/hashicorp/consul/consul/structs"
	"github.com/hashicorp/consul/testutil"
)

const (
	basePortNumber = 10000

	portOffsetDNS = iota
	portOffsetHTTP
	portOffsetRPC
	portOffsetSerfLan
	portOffsetSerfWan
	portOffsetServer

	// Must be last in list
	numPortsPerIndex
)

var offset uint64 = basePortNumber

func nextConfig() *Config {
	idx := int(atomic.AddUint64(&offset, numPortsPerIndex))
	conf := DefaultConfig()

	conf.Version = "a.b"
	conf.VersionPrerelease = "c.d"
	conf.AdvertiseAddr = "127.0.0.1"
	conf.Bootstrap = true
	conf.Datacenter = "dc1"
	conf.NodeName = fmt.Sprintf("Node %d", idx)
	conf.BindAddr = "127.0.0.1"
	conf.Ports.DNS = basePortNumber + idx + portOffsetDNS
	conf.Ports.HTTP = basePortNumber + idx + portOffsetHTTP
	conf.Ports.RPC = basePortNumber + idx + portOffsetRPC
	conf.Ports.SerfLan = basePortNumber + idx + portOffsetSerfLan
	conf.Ports.SerfWan = basePortNumber + idx + portOffsetSerfWan
	conf.Ports.Server = basePortNumber + idx + portOffsetServer
	conf.Server = true
	conf.ACLDatacenter = "dc1"
	conf.ACLMasterToken = "root"

	cons := consul.DefaultConfig()
	conf.ConsulConfig = cons

	cons.SerfLANConfig.MemberlistConfig.SuspicionMult = 3
	cons.SerfLANConfig.MemberlistConfig.ProbeTimeout = 100 * time.Millisecond
	cons.SerfLANConfig.MemberlistConfig.ProbeInterval = 100 * time.Millisecond
	cons.SerfLANConfig.MemberlistConfig.GossipInterval = 100 * time.Millisecond

	cons.SerfWANConfig.MemberlistConfig.SuspicionMult = 3
	cons.SerfWANConfig.MemberlistConfig.ProbeTimeout = 100 * time.Millisecond
	cons.SerfWANConfig.MemberlistConfig.ProbeInterval = 100 * time.Millisecond
	cons.SerfWANConfig.MemberlistConfig.GossipInterval = 100 * time.Millisecond

	cons.RaftConfig.LeaderLeaseTimeout = 20 * time.Millisecond
	cons.RaftConfig.HeartbeatTimeout = 40 * time.Millisecond
	cons.RaftConfig.ElectionTimeout = 40 * time.Millisecond

	cons.DisableCoordinates = false
	cons.CoordinateUpdatePeriod = 100 * time.Millisecond
	return conf
}

func makeAgentLog(t *testing.T, conf *Config, l io.Writer) (string, *Agent) {
	dir, err := ioutil.TempDir("", "agent")
	if err != nil {
		t.Fatalf(fmt.Sprintf("err: %v", err))
	}

	conf.DataDir = dir
	agent, err := Create(conf, l)
	if err != nil {
		os.RemoveAll(dir)
		t.Fatalf(fmt.Sprintf("err: %v", err))
	}

	return dir, agent
}

func makeAgentKeyring(t *testing.T, conf *Config, key string) (string, *Agent) {
	dir, err := ioutil.TempDir("", "agent")
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	conf.DataDir = dir

	fileLAN := filepath.Join(dir, serfLANKeyring)
	if err := initKeyring(fileLAN, key); err != nil {
		t.Fatalf("err: %s", err)
	}
	fileWAN := filepath.Join(dir, serfWANKeyring)
	if err := initKeyring(fileWAN, key); err != nil {
		t.Fatalf("err: %s", err)
	}

	agent, err := Create(conf, nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	return dir, agent
}

func makeAgent(t *testing.T, conf *Config) (string, *Agent) {
	return makeAgentLog(t, conf, nil)
}

func TestAgentStartStop(t *testing.T) {
	dir, agent := makeAgent(t, nextConfig())
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	if err := agent.Leave(); err != nil {
		t.Fatalf("err: %v", err)
	}
	if err := agent.Shutdown(); err != nil {
		t.Fatalf("err: %v", err)
	}

	select {
	case <-agent.ShutdownCh():
	default:
		t.Fatalf("should be closed")
	}
}

func TestAgent_RPCPing(t *testing.T) {
	dir, agent := makeAgent(t, nextConfig())
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	var out struct{}
	if err := agent.RPC("Status.Ping", struct{}{}, &out); err != nil {
		t.Fatalf("err: %v", err)
	}
}

func TestAgent_CheckAdvertiseAddrsSettings(t *testing.T) {
	c := nextConfig()
	c.AdvertiseAddrs.SerfLan, _ = net.ResolveTCPAddr("tcp", "127.0.0.42:1233")
	c.AdvertiseAddrs.SerfWan, _ = net.ResolveTCPAddr("tcp", "127.0.0.43:1234")
	c.AdvertiseAddrs.RPC, _ = net.ResolveTCPAddr("tcp", "127.0.0.44:1235")
	dir, agent := makeAgent(t, c)
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	serfLanAddr := agent.consulConfig().SerfLANConfig.MemberlistConfig.AdvertiseAddr
	if serfLanAddr != "127.0.0.42" {
		t.Fatalf("SerfLan is not properly set to '127.0.0.42': %s", serfLanAddr)
	}
	serfLanPort := agent.consulConfig().SerfLANConfig.MemberlistConfig.AdvertisePort
	if serfLanPort != 1233 {
		t.Fatalf("SerfLan is not properly set to '1233': %d", serfLanPort)
	}
	serfWanAddr := agent.consulConfig().SerfWANConfig.MemberlistConfig.AdvertiseAddr
	if serfWanAddr != "127.0.0.43" {
		t.Fatalf("SerfWan is not properly set to '127.0.0.43': %s", serfWanAddr)
	}
	serfWanPort := agent.consulConfig().SerfWANConfig.MemberlistConfig.AdvertisePort
	if serfWanPort != 1234 {
		t.Fatalf("SerfWan is not properly set to '1234': %d", serfWanPort)
	}
	rpc := agent.consulConfig().RPCAdvertise
	if rpc != c.AdvertiseAddrs.RPC {
		t.Fatalf("RPC is not properly set to %v: %s", c.AdvertiseAddrs.RPC, rpc)
	}
	expected := map[string]string{
		"lan": agent.config.AdvertiseAddr,
		"wan": agent.config.AdvertiseAddrWan,
	}
	if !reflect.DeepEqual(agent.config.TaggedAddresses, expected) {
		t.Fatalf("Tagged addresses not set up properly: %v", agent.config.TaggedAddresses)
	}
}

func TestAgent_ReconnectConfigSettings(t *testing.T) {
	c := nextConfig()
	func() {
		dir, agent := makeAgent(t, c)
		defer os.RemoveAll(dir)
		defer agent.Shutdown()

		lan := agent.consulConfig().SerfLANConfig.ReconnectTimeout
		if lan != 3*24*time.Hour {
			t.Fatalf("bad: %s", lan.String())
		}

		wan := agent.consulConfig().SerfWANConfig.ReconnectTimeout
		if wan != 3*24*time.Hour {
			t.Fatalf("bad: %s", wan.String())
		}
	}()

	c.ReconnectTimeoutLan = 24 * time.Hour
	c.ReconnectTimeoutWan = 36 * time.Hour
	func() {
		dir, agent := makeAgent(t, c)
		defer os.RemoveAll(dir)
		defer agent.Shutdown()

		lan := agent.consulConfig().SerfLANConfig.ReconnectTimeout
		if lan != 24*time.Hour {
			t.Fatalf("bad: %s", lan.String())
		}

		wan := agent.consulConfig().SerfWANConfig.ReconnectTimeout
		if wan != 36*time.Hour {
			t.Fatalf("bad: %s", wan.String())
		}
	}()
}

func TestAgent_AddService(t *testing.T) {
	dir, agent := makeAgent(t, nextConfig())
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	// Service registration with a single check
	{
		srv := &structs.NodeService{
			ID:      "redis",
			Service: "redis",
			Tags:    []string{"foo"},
			Port:    8000,
		}
		chkTypes := CheckTypes{
			&CheckType{
				TTL:   time.Minute,
				Notes: "redis heath check 2",
			},
		}
		err := agent.AddService(srv, chkTypes, false, "")
		if err != nil {
			t.Fatalf("err: %v", err)
		}

		// Ensure we have a state mapping
		if _, ok := agent.state.Services()["redis"]; !ok {
			t.Fatalf("missing redis service")
		}

		// Ensure the check is registered
		if _, ok := agent.state.Checks()["service:redis"]; !ok {
			t.Fatalf("missing redis check")
		}

		// Ensure a TTL is setup
		if _, ok := agent.checkTTLs["service:redis"]; !ok {
			t.Fatalf("missing redis check ttl")
		}

		// Ensure the notes are passed through
		if agent.state.Checks()["service:redis"].Notes == "" {
			t.Fatalf("missing redis check notes")
		}
	}

	// Service registration with multiple checks
	{
		srv := &structs.NodeService{
			ID:      "memcache",
			Service: "memcache",
			Tags:    []string{"bar"},
			Port:    8000,
		}
		chkTypes := CheckTypes{
			&CheckType{
				TTL:   time.Minute,
				Notes: "memcache health check 1",
			},
			&CheckType{
				TTL:   time.Second,
				Notes: "memcache heath check 2",
			},
		}
		if err := agent.AddService(srv, chkTypes, false, ""); err != nil {
			t.Fatalf("err: %v", err)
		}

		// Ensure we have a state mapping
		if _, ok := agent.state.Services()["memcache"]; !ok {
			t.Fatalf("missing memcache service")
		}

		// Ensure both checks were added
		if _, ok := agent.state.Checks()["service:memcache:1"]; !ok {
			t.Fatalf("missing memcache:1 check")
		}
		if _, ok := agent.state.Checks()["service:memcache:2"]; !ok {
			t.Fatalf("missing memcache:2 check")
		}

		// Ensure a TTL is setup
		if _, ok := agent.checkTTLs["service:memcache:1"]; !ok {
			t.Fatalf("missing memcache:1 check ttl")
		}
		if _, ok := agent.checkTTLs["service:memcache:2"]; !ok {
			t.Fatalf("missing memcache:2 check ttl")
		}

		// Ensure the notes are passed through
		if agent.state.Checks()["service:memcache:1"].Notes == "" {
			t.Fatalf("missing redis check notes")
		}
		if agent.state.Checks()["service:memcache:2"].Notes == "" {
			t.Fatalf("missing redis check notes")
		}
	}
}

func TestAgent_RemoveService(t *testing.T) {
	dir, agent := makeAgent(t, nextConfig())
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	// Remove a service that doesn't exist
	if err := agent.RemoveService("redis", false); err != nil {
		t.Fatalf("err: %v", err)
	}

	// Remove the consul service
	if err := agent.RemoveService("consul", false); err == nil {
		t.Fatalf("should have errored")
	}

	// Remove without an ID
	if err := agent.RemoveService("", false); err == nil {
		t.Fatalf("should have errored")
	}

	// Removing a service with a single check works
	{
		srv := &structs.NodeService{
			ID:      "memcache",
			Service: "memcache",
			Port:    8000,
		}
		chkTypes := CheckTypes{&CheckType{TTL: time.Minute}}

		if err := agent.AddService(srv, chkTypes, false, ""); err != nil {
			t.Fatalf("err: %v", err)
		}

		// Add a check after the fact with a specific check ID
		check := &CheckDefinition{
			ID:        "check2",
			Name:      "check2",
			ServiceID: "memcache",
			CheckType: CheckType{TTL: time.Minute},
		}
		hc := check.HealthCheck("node1")
		if err := agent.AddCheck(hc, &check.CheckType, false, ""); err != nil {
			t.Fatalf("err: %s", err)
		}

		if err := agent.RemoveService("memcache", false); err != nil {
			t.Fatalf("err: %s", err)
		}
		if _, ok := agent.state.Checks()["service:memcache"]; ok {
			t.Fatalf("have memcache check")
		}
		if _, ok := agent.state.Checks()["check2"]; ok {
			t.Fatalf("have check2 check")
		}
	}

	// Removing a service with multiple checks works
	{
		srv := &structs.NodeService{
			ID:      "redis",
			Service: "redis",
			Port:    8000,
		}
		chkTypes := CheckTypes{
			&CheckType{TTL: time.Minute},
			&CheckType{TTL: 30 * time.Second},
		}
		if err := agent.AddService(srv, chkTypes, false, ""); err != nil {
			t.Fatalf("err: %v", err)
		}

		// Remove the service
		if err := agent.RemoveService("redis", false); err != nil {
			t.Fatalf("err: %v", err)
		}

		// Ensure we have a state mapping
		if _, ok := agent.state.Services()["redis"]; ok {
			t.Fatalf("have redis service")
		}

		// Ensure checks were removed
		if _, ok := agent.state.Checks()["service:redis:1"]; ok {
			t.Fatalf("check redis:1 should be removed")
		}
		if _, ok := agent.state.Checks()["service:redis:2"]; ok {
			t.Fatalf("check redis:2 should be removed")
		}

		// Ensure a TTL is setup
		if _, ok := agent.checkTTLs["service:redis:1"]; ok {
			t.Fatalf("check ttl for redis:1 should be removed")
		}
		if _, ok := agent.checkTTLs["service:redis:2"]; ok {
			t.Fatalf("check ttl for redis:2 should be removed")
		}
	}
}

func TestAgent_AddCheck(t *testing.T) {
	dir, agent := makeAgent(t, nextConfig())
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	health := &structs.HealthCheck{
		Node:    "foo",
		CheckID: "mem",
		Name:    "memory util",
		Status:  structs.HealthCritical,
	}
	chk := &CheckType{
		Script:   "exit 0",
		Interval: 15 * time.Second,
	}
	err := agent.AddCheck(health, chk, false, "")
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	// Ensure we have a check mapping
	sChk, ok := agent.state.Checks()["mem"]
	if !ok {
		t.Fatalf("missing mem check")
	}

	// Ensure our check is in the right state
	if sChk.Status != structs.HealthCritical {
		t.Fatalf("check not critical")
	}

	// Ensure a TTL is setup
	if _, ok := agent.checkMonitors["mem"]; !ok {
		t.Fatalf("missing mem monitor")
	}
}

func TestAgent_AddCheck_StartPassing(t *testing.T) {
	dir, agent := makeAgent(t, nextConfig())
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	health := &structs.HealthCheck{
		Node:    "foo",
		CheckID: "mem",
		Name:    "memory util",
		Status:  structs.HealthPassing,
	}
	chk := &CheckType{
		Script:   "exit 0",
		Interval: 15 * time.Second,
	}
	err := agent.AddCheck(health, chk, false, "")
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	// Ensure we have a check mapping
	sChk, ok := agent.state.Checks()["mem"]
	if !ok {
		t.Fatalf("missing mem check")
	}

	// Ensure our check is in the right state
	if sChk.Status != structs.HealthPassing {
		t.Fatalf("check not passing")
	}

	// Ensure a TTL is setup
	if _, ok := agent.checkMonitors["mem"]; !ok {
		t.Fatalf("missing mem monitor")
	}
}

func TestAgent_AddCheck_MinInterval(t *testing.T) {
	dir, agent := makeAgent(t, nextConfig())
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	health := &structs.HealthCheck{
		Node:    "foo",
		CheckID: "mem",
		Name:    "memory util",
		Status:  structs.HealthCritical,
	}
	chk := &CheckType{
		Script:   "exit 0",
		Interval: time.Microsecond,
	}
	err := agent.AddCheck(health, chk, false, "")
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	// Ensure we have a check mapping
	if _, ok := agent.state.Checks()["mem"]; !ok {
		t.Fatalf("missing mem check")
	}

	// Ensure a TTL is setup
	if mon, ok := agent.checkMonitors["mem"]; !ok {
		t.Fatalf("missing mem monitor")
	} else if mon.Interval != MinInterval {
		t.Fatalf("bad mem monitor interval")
	}
}

func TestAgent_AddCheck_MissingService(t *testing.T) {
	dir, agent := makeAgent(t, nextConfig())
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	health := &structs.HealthCheck{
		Node:      "foo",
		CheckID:   "baz",
		Name:      "baz check 1",
		ServiceID: "baz",
	}
	chk := &CheckType{
		Script:   "exit 0",
		Interval: time.Microsecond,
	}
	err := agent.AddCheck(health, chk, false, "")
	if err == nil || err.Error() != `ServiceID "baz" does not exist` {
		t.Fatalf("expected service id error, got: %v", err)
	}
}

func TestAgent_AddCheck_RestoreState(t *testing.T) {
	dir, agent := makeAgent(t, nextConfig())
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	// Create some state and persist it
	ttl := &CheckTTL{
		CheckID: "baz",
		TTL:     time.Minute,
	}
	err := agent.persistCheckState(ttl, structs.HealthPassing, "yup")
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	// Build and register the check definition and initial state
	health := &structs.HealthCheck{
		Node:    "foo",
		CheckID: "baz",
		Name:    "baz check 1",
	}
	chk := &CheckType{
		TTL: time.Minute,
	}
	err = agent.AddCheck(health, chk, false, "")
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	// Ensure the check status was restored during registration
	checks := agent.state.Checks()
	check, ok := checks["baz"]
	if !ok {
		t.Fatalf("missing check")
	}
	if check.Status != structs.HealthPassing {
		t.Fatalf("bad: %#v", check)
	}
	if check.Output != "yup" {
		t.Fatalf("bad: %#v", check)
	}
}

func TestAgent_RemoveCheck(t *testing.T) {
	dir, agent := makeAgent(t, nextConfig())
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	// Remove check that doesn't exist
	if err := agent.RemoveCheck("mem", false); err != nil {
		t.Fatalf("err: %v", err)
	}

	// Remove without an ID
	if err := agent.RemoveCheck("", false); err == nil {
		t.Fatalf("should have errored")
	}

	health := &structs.HealthCheck{
		Node:    "foo",
		CheckID: "mem",
		Name:    "memory util",
		Status:  structs.HealthCritical,
	}
	chk := &CheckType{
		Script:   "exit 0",
		Interval: 15 * time.Second,
	}
	err := agent.AddCheck(health, chk, false, "")
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	// Remove check
	if err := agent.RemoveCheck("mem", false); err != nil {
		t.Fatalf("err: %v", err)
	}

	// Ensure we have a check mapping
	if _, ok := agent.state.Checks()["mem"]; ok {
		t.Fatalf("have mem check")
	}

	// Ensure a TTL is setup
	if _, ok := agent.checkMonitors["mem"]; ok {
		t.Fatalf("have mem monitor")
	}
}

func TestAgent_updateTTLCheck(t *testing.T) {
	dir, agent := makeAgent(t, nextConfig())
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	health := &structs.HealthCheck{
		Node:    "foo",
		CheckID: "mem",
		Name:    "memory util",
		Status:  structs.HealthCritical,
	}
	chk := &CheckType{
		TTL: 15 * time.Second,
	}

	// Add check and update it.
	err := agent.AddCheck(health, chk, false, "")
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if err := agent.updateTTLCheck("mem", structs.HealthPassing, "foo"); err != nil {
		t.Fatalf("err: %v", err)
	}

	// Ensure we have a check mapping.
	status := agent.state.Checks()["mem"]
	if status.Status != structs.HealthPassing {
		t.Fatalf("bad: %v", status)
	}
	if status.Output != "foo" {
		t.Fatalf("bad: %v", status)
	}
}

func TestAgent_ConsulService(t *testing.T) {
	dir, agent := makeAgent(t, nextConfig())
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	testutil.WaitForLeader(t, agent.RPC, "dc1")

	// Consul service is registered
	services := agent.state.Services()
	if _, ok := services[consul.ConsulServiceID]; !ok {
		t.Fatalf("%s service should be registered", consul.ConsulServiceID)
	}

	// Perform anti-entropy on consul service
	if err := agent.state.syncService(consul.ConsulServiceID); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Consul service should be in sync
	if !agent.state.serviceStatus[consul.ConsulServiceID].inSync {
		t.Fatalf("%s service should be in sync", consul.ConsulServiceID)
	}
}

func TestAgent_PersistService(t *testing.T) {
	config := nextConfig()
	config.Server = false
	dir, agent := makeAgent(t, config)
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	svc := &structs.NodeService{
		ID:      "redis",
		Service: "redis",
		Tags:    []string{"foo"},
		Port:    8000,
	}

	file := filepath.Join(agent.config.DataDir, servicesDir, stringHash(svc.ID))

	// Check is not persisted unless requested
	if err := agent.AddService(svc, nil, false, ""); err != nil {
		t.Fatalf("err: %v", err)
	}
	if _, err := os.Stat(file); err == nil {
		t.Fatalf("should not persist")
	}

	// Persists to file if requested
	if err := agent.AddService(svc, nil, true, "mytoken"); err != nil {
		t.Fatalf("err: %v", err)
	}
	if _, err := os.Stat(file); err != nil {
		t.Fatalf("err: %s", err)
	}
	expected, err := json.Marshal(persistedService{
		Token:   "mytoken",
		Service: svc,
	})
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	content, err := ioutil.ReadFile(file)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if !bytes.Equal(expected, content) {
		t.Fatalf("bad: %s", string(content))
	}

	// Updates service definition on disk
	svc.Port = 8001
	if err := agent.AddService(svc, nil, true, "mytoken"); err != nil {
		t.Fatalf("err: %v", err)
	}
	expected, err = json.Marshal(persistedService{
		Token:   "mytoken",
		Service: svc,
	})
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	content, err = ioutil.ReadFile(file)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if !bytes.Equal(expected, content) {
		t.Fatalf("bad: %s", string(content))
	}
	agent.Shutdown()

	// Should load it back during later start
	agent2, err := Create(config, nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	defer agent2.Shutdown()

	restored, ok := agent2.state.services[svc.ID]
	if !ok {
		t.Fatalf("bad: %#v", agent2.state.services)
	}
	if agent2.state.serviceTokens[svc.ID] != "mytoken" {
		t.Fatalf("bad: %#v", agent2.state.services[svc.ID])
	}
	if restored.Port != 8001 {
		t.Fatalf("bad: %#v", restored)
	}
}

func TestAgent_persistedService_compat(t *testing.T) {
	// Tests backwards compatibility of persisted services from pre-0.5.1
	config := nextConfig()
	dir, agent := makeAgent(t, config)
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	svc := &structs.NodeService{
		ID:      "redis",
		Service: "redis",
		Tags:    []string{"foo"},
		Port:    8000,
	}

	// Encode the NodeService directly. This is what previous versions
	// would serialize to the file (without the wrapper)
	encoded, err := json.Marshal(svc)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	// Write the content to the file
	file := filepath.Join(agent.config.DataDir, servicesDir, stringHash(svc.ID))
	if err := os.MkdirAll(filepath.Dir(file), 0700); err != nil {
		t.Fatalf("err: %s", err)
	}
	if err := ioutil.WriteFile(file, encoded, 0600); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Load the services
	if err := agent.loadServices(config); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Ensure the service was restored
	services := agent.state.Services()
	result, ok := services["redis"]
	if !ok {
		t.Fatalf("missing service")
	}
	if !reflect.DeepEqual(result, svc) {
		t.Fatalf("bad: %#v", result)
	}
}

func TestAgent_PurgeService(t *testing.T) {
	config := nextConfig()
	dir, agent := makeAgent(t, config)
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	svc := &structs.NodeService{
		ID:      "redis",
		Service: "redis",
		Tags:    []string{"foo"},
		Port:    8000,
	}

	file := filepath.Join(agent.config.DataDir, servicesDir, stringHash(svc.ID))
	if err := agent.AddService(svc, nil, true, ""); err != nil {
		t.Fatalf("err: %v", err)
	}

	// Not removed
	if err := agent.RemoveService(svc.ID, false); err != nil {
		t.Fatalf("err: %s", err)
	}
	if _, err := os.Stat(file); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Removed
	if err := agent.RemoveService(svc.ID, true); err != nil {
		t.Fatalf("err: %s", err)
	}
	if _, err := os.Stat(file); !os.IsNotExist(err) {
		t.Fatalf("bad: %#v", err)
	}
}

func TestAgent_PurgeServiceOnDuplicate(t *testing.T) {
	config := nextConfig()
	config.Server = false
	dir, agent := makeAgent(t, config)
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	svc1 := &structs.NodeService{
		ID:      "redis",
		Service: "redis",
		Tags:    []string{"foo"},
		Port:    8000,
	}

	// First persist the service
	if err := agent.AddService(svc1, nil, true, ""); err != nil {
		t.Fatalf("err: %v", err)
	}
	agent.Shutdown()

	// Try bringing the agent back up with the service already
	// existing in the config
	svc2 := &ServiceDefinition{
		ID:   "redis",
		Name: "redis",
		Tags: []string{"bar"},
		Port: 9000,
	}

	config.Services = []*ServiceDefinition{svc2}
	agent2, err := Create(config, nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	defer agent2.Shutdown()

	file := filepath.Join(agent.config.DataDir, servicesDir, stringHash(svc1.ID))
	if _, err := os.Stat(file); err == nil {
		t.Fatalf("should have removed persisted service")
	}
	result, ok := agent2.state.services[svc2.ID]
	if !ok {
		t.Fatalf("missing service registration")
	}
	if !reflect.DeepEqual(result.Tags, svc2.Tags) || result.Port != svc2.Port {
		t.Fatalf("bad: %#v", result)
	}
}

func TestAgent_PersistCheck(t *testing.T) {
	config := nextConfig()
	config.Server = false
	dir, agent := makeAgent(t, config)
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	check := &structs.HealthCheck{
		Node:    config.NodeName,
		CheckID: "mem",
		Name:    "memory check",
		Status:  structs.HealthPassing,
	}
	chkType := &CheckType{
		Script:   "/bin/true",
		Interval: 10 * time.Second,
	}

	file := filepath.Join(agent.config.DataDir, checksDir, checkIDHash(check.CheckID))

	// Not persisted if not requested
	if err := agent.AddCheck(check, chkType, false, ""); err != nil {
		t.Fatalf("err: %v", err)
	}
	if _, err := os.Stat(file); err == nil {
		t.Fatalf("should not persist")
	}

	// Should persist if requested
	if err := agent.AddCheck(check, chkType, true, "mytoken"); err != nil {
		t.Fatalf("err: %v", err)
	}
	if _, err := os.Stat(file); err != nil {
		t.Fatalf("err: %s", err)
	}
	expected, err := json.Marshal(persistedCheck{
		Check:   check,
		ChkType: chkType,
		Token:   "mytoken",
	})
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	content, err := ioutil.ReadFile(file)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if !bytes.Equal(expected, content) {
		t.Fatalf("bad: %s", string(content))
	}

	// Updates the check definition on disk
	check.Name = "mem1"
	if err := agent.AddCheck(check, chkType, true, "mytoken"); err != nil {
		t.Fatalf("err: %v", err)
	}
	expected, err = json.Marshal(persistedCheck{
		Check:   check,
		ChkType: chkType,
		Token:   "mytoken",
	})
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	content, err = ioutil.ReadFile(file)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	if !bytes.Equal(expected, content) {
		t.Fatalf("bad: %s", string(content))
	}
	agent.Shutdown()

	// Should load it back during later start
	agent2, err := Create(config, nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	defer agent2.Shutdown()

	result, ok := agent2.state.checks[check.CheckID]
	if !ok {
		t.Fatalf("bad: %#v", agent2.state.checks)
	}
	if result.Status != structs.HealthCritical {
		t.Fatalf("bad: %#v", result)
	}
	if result.Name != "mem1" {
		t.Fatalf("bad: %#v", result)
	}

	// Should have restored the monitor
	if _, ok := agent2.checkMonitors[check.CheckID]; !ok {
		t.Fatalf("bad: %#v", agent2.checkMonitors)
	}
	if agent2.state.checkTokens[check.CheckID] != "mytoken" {
		t.Fatalf("bad: %s", agent2.state.checkTokens[check.CheckID])
	}
}

func TestAgent_PurgeCheck(t *testing.T) {
	config := nextConfig()
	dir, agent := makeAgent(t, config)
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	check := &structs.HealthCheck{
		Node:    config.NodeName,
		CheckID: "mem",
		Name:    "memory check",
		Status:  structs.HealthPassing,
	}

	file := filepath.Join(agent.config.DataDir, checksDir, checkIDHash(check.CheckID))
	if err := agent.AddCheck(check, nil, true, ""); err != nil {
		t.Fatalf("err: %v", err)
	}

	// Not removed
	if err := agent.RemoveCheck(check.CheckID, false); err != nil {
		t.Fatalf("err: %s", err)
	}
	if _, err := os.Stat(file); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Removed
	if err := agent.RemoveCheck(check.CheckID, true); err != nil {
		t.Fatalf("err: %s", err)
	}
	if _, err := os.Stat(file); !os.IsNotExist(err) {
		t.Fatalf("bad: %#v", err)
	}
}

func TestAgent_PurgeCheckOnDuplicate(t *testing.T) {
	config := nextConfig()
	config.Server = false
	dir, agent := makeAgent(t, config)
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	check1 := &structs.HealthCheck{
		Node:    config.NodeName,
		CheckID: "mem",
		Name:    "memory check",
		Status:  structs.HealthPassing,
	}

	// First persist the check
	if err := agent.AddCheck(check1, nil, true, ""); err != nil {
		t.Fatalf("err: %v", err)
	}
	agent.Shutdown()

	// Start again with the check registered in config
	check2 := &CheckDefinition{
		ID:    "mem",
		Name:  "memory check",
		Notes: "my cool notes",
		CheckType: CheckType{
			Script:   "/bin/check-redis.py",
			Interval: 30 * time.Second,
		},
	}

	config.Checks = []*CheckDefinition{check2}
	agent2, err := Create(config, nil)
	if err != nil {
		t.Fatalf("err: %s", err)
	}
	defer agent2.Shutdown()

	file := filepath.Join(agent.config.DataDir, checksDir, checkIDHash(check1.CheckID))
	if _, err := os.Stat(file); err == nil {
		t.Fatalf("should have removed persisted check")
	}
	result, ok := agent2.state.checks[check2.ID]
	if !ok {
		t.Fatalf("missing check registration")
	}
	expected := check2.HealthCheck(config.NodeName)
	if !reflect.DeepEqual(expected, result) {
		t.Fatalf("bad: %#v", result)
	}
}

func TestAgent_loadChecks_token(t *testing.T) {
	config := nextConfig()
	config.Checks = append(config.Checks, &CheckDefinition{
		ID:    "rabbitmq",
		Name:  "rabbitmq",
		Token: "abc123",
		CheckType: CheckType{
			TTL: 10 * time.Second,
		},
	})
	dir, agent := makeAgent(t, config)
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	checks := agent.state.Checks()
	if _, ok := checks["rabbitmq"]; !ok {
		t.Fatalf("missing check")
	}
	if token := agent.state.CheckToken("rabbitmq"); token != "abc123" {
		t.Fatalf("bad: %s", token)
	}
}

func TestAgent_unloadChecks(t *testing.T) {
	config := nextConfig()
	dir, agent := makeAgent(t, config)
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	// First register a service
	svc := &structs.NodeService{
		ID:      "redis",
		Service: "redis",
		Tags:    []string{"foo"},
		Port:    8000,
	}
	if err := agent.AddService(svc, nil, false, ""); err != nil {
		t.Fatalf("err: %v", err)
	}

	// Register a check
	check1 := &structs.HealthCheck{
		Node:        config.NodeName,
		CheckID:     "service:redis",
		Name:        "redischeck",
		Status:      structs.HealthPassing,
		ServiceID:   "redis",
		ServiceName: "redis",
	}
	if err := agent.AddCheck(check1, nil, false, ""); err != nil {
		t.Fatalf("err: %s", err)
	}
	found := false
	for check, _ := range agent.state.Checks() {
		if check == check1.CheckID {
			found = true
			break
		}
	}
	if !found {
		t.Fatalf("check should have been registered")
	}

	// Unload all of the checks
	if err := agent.unloadChecks(); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Make sure it was unloaded
	for check, _ := range agent.state.Checks() {
		if check == check1.CheckID {
			t.Fatalf("should have unloaded checks")
		}
	}
}

func TestAgent_loadServices_token(t *testing.T) {
	config := nextConfig()
	config.Services = append(config.Services, &ServiceDefinition{
		ID:    "rabbitmq",
		Name:  "rabbitmq",
		Port:  5672,
		Token: "abc123",
	})
	dir, agent := makeAgent(t, config)
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	services := agent.state.Services()
	if _, ok := services["rabbitmq"]; !ok {
		t.Fatalf("missing service")
	}
	if token := agent.state.ServiceToken("rabbitmq"); token != "abc123" {
		t.Fatalf("bad: %s", token)
	}
}

func TestAgent_unloadServices(t *testing.T) {
	config := nextConfig()
	dir, agent := makeAgent(t, config)
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	svc := &structs.NodeService{
		ID:      "redis",
		Service: "redis",
		Tags:    []string{"foo"},
		Port:    8000,
	}

	// Register the service
	if err := agent.AddService(svc, nil, false, ""); err != nil {
		t.Fatalf("err: %v", err)
	}
	found := false
	for id, _ := range agent.state.Services() {
		if id == svc.ID {
			found = true
			break
		}
	}
	if !found {
		t.Fatalf("should have registered service")
	}

	// Unload all services
	if err := agent.unloadServices(); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Make sure it was unloaded and the consul service remains
	found = false
	for id, _ := range agent.state.Services() {
		if id == svc.ID {
			t.Fatalf("should have unloaded services")
		}
		if id == consul.ConsulServiceID {
			found = true
		}
	}
	if !found {
		t.Fatalf("consul service should not be removed")
	}
}

func TestAgent_Service_MaintenanceMode(t *testing.T) {
	config := nextConfig()
	dir, agent := makeAgent(t, config)
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	svc := &structs.NodeService{
		ID:      "redis",
		Service: "redis",
		Tags:    []string{"foo"},
		Port:    8000,
	}

	// Register the service
	if err := agent.AddService(svc, nil, false, ""); err != nil {
		t.Fatalf("err: %v", err)
	}

	// Enter maintenance mode for the service
	if err := agent.EnableServiceMaintenance("redis", "broken", "mytoken"); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Make sure the critical health check was added
	checkID := serviceMaintCheckID("redis")
	check, ok := agent.state.Checks()[checkID]
	if !ok {
		t.Fatalf("should have registered critical maintenance check")
	}

	// Check that the token was used to register the check
	if token := agent.state.CheckToken(checkID); token != "mytoken" {
		t.Fatalf("expected 'mytoken', got: '%s'", token)
	}

	// Ensure the reason was set in notes
	if check.Notes != "broken" {
		t.Fatalf("bad: %#v", check)
	}

	// Leave maintenance mode
	if err := agent.DisableServiceMaintenance("redis"); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Ensure the check was deregistered
	if _, ok := agent.state.Checks()[checkID]; ok {
		t.Fatalf("should have deregistered maintenance check")
	}

	// Enter service maintenance mode without providing a reason
	if err := agent.EnableServiceMaintenance("redis", "", ""); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Ensure the check was registered with the default notes
	check, ok = agent.state.Checks()[checkID]
	if !ok {
		t.Fatalf("should have registered critical check")
	}
	if check.Notes != defaultServiceMaintReason {
		t.Fatalf("bad: %#v", check)
	}
}

func TestAgent_Service_Reap(t *testing.T) {
	config := nextConfig()
	config.CheckReapInterval = time.Millisecond
	config.CheckDeregisterIntervalMin = 0
	dir, agent := makeAgent(t, config)
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	svc := &structs.NodeService{
		ID:      "redis",
		Service: "redis",
		Tags:    []string{"foo"},
		Port:    8000,
	}
	chkTypes := CheckTypes{
		&CheckType{
			Status: structs.HealthPassing,
			TTL:    10 * time.Millisecond,
			DeregisterCriticalServiceAfter: 100 * time.Millisecond,
		},
	}

	// Register the service.
	if err := agent.AddService(svc, chkTypes, false, ""); err != nil {
		t.Fatalf("err: %v", err)
	}

	// Make sure it's there and there's no critical check yet.
	if _, ok := agent.state.Services()["redis"]; !ok {
		t.Fatalf("should have redis service")
	}
	if checks := agent.state.CriticalChecks(); len(checks) > 0 {
		t.Fatalf("should not have critical checks")
	}

	// Wait for the check TTL to fail.
	time.Sleep(30 * time.Millisecond)
	if _, ok := agent.state.Services()["redis"]; !ok {
		t.Fatalf("should have redis service")
	}
	if checks := agent.state.CriticalChecks(); len(checks) != 1 {
		t.Fatalf("should have a critical check")
	}

	// Pass the TTL.
	if err := agent.updateTTLCheck("service:redis", structs.HealthPassing, "foo"); err != nil {
		t.Fatalf("err: %v", err)
	}
	if _, ok := agent.state.Services()["redis"]; !ok {
		t.Fatalf("should have redis service")
	}
	if checks := agent.state.CriticalChecks(); len(checks) > 0 {
		t.Fatalf("should not have critical checks")
	}

	// Wait for the check TTL to fail again.
	time.Sleep(30 * time.Millisecond)
	if _, ok := agent.state.Services()["redis"]; !ok {
		t.Fatalf("should have redis service")
	}
	if checks := agent.state.CriticalChecks(); len(checks) != 1 {
		t.Fatalf("should have a critical check")
	}

	// Wait for the reap.
	time.Sleep(300 * time.Millisecond)
	if _, ok := agent.state.Services()["redis"]; ok {
		t.Fatalf("redis service should have been reaped")
	}
	if checks := agent.state.CriticalChecks(); len(checks) > 0 {
		t.Fatalf("should not have critical checks")
	}
}

func TestAgent_Service_NoReap(t *testing.T) {
	config := nextConfig()
	config.CheckReapInterval = time.Millisecond
	config.CheckDeregisterIntervalMin = 0
	dir, agent := makeAgent(t, config)
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	svc := &structs.NodeService{
		ID:      "redis",
		Service: "redis",
		Tags:    []string{"foo"},
		Port:    8000,
	}
	chkTypes := CheckTypes{
		&CheckType{
			Status: structs.HealthPassing,
			TTL:    10 * time.Millisecond,
		},
	}

	// Register the service.
	if err := agent.AddService(svc, chkTypes, false, ""); err != nil {
		t.Fatalf("err: %v", err)
	}

	// Make sure it's there and there's no critical check yet.
	if _, ok := agent.state.Services()["redis"]; !ok {
		t.Fatalf("should have redis service")
	}
	if checks := agent.state.CriticalChecks(); len(checks) > 0 {
		t.Fatalf("should not have critical checks")
	}

	// Wait for the check TTL to fail.
	time.Sleep(30 * time.Millisecond)
	if _, ok := agent.state.Services()["redis"]; !ok {
		t.Fatalf("should have redis service")
	}
	if checks := agent.state.CriticalChecks(); len(checks) != 1 {
		t.Fatalf("should have a critical check")
	}

	// Wait a while and make sure it doesn't reap.
	time.Sleep(300 * time.Millisecond)
	if _, ok := agent.state.Services()["redis"]; !ok {
		t.Fatalf("should have redis service")
	}
	if checks := agent.state.CriticalChecks(); len(checks) != 1 {
		t.Fatalf("should have a critical check")
	}
}

func TestAgent_addCheck_restoresSnapshot(t *testing.T) {
	config := nextConfig()
	dir, agent := makeAgent(t, config)
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	// First register a service
	svc := &structs.NodeService{
		ID:      "redis",
		Service: "redis",
		Tags:    []string{"foo"},
		Port:    8000,
	}
	if err := agent.AddService(svc, nil, false, ""); err != nil {
		t.Fatalf("err: %v", err)
	}

	// Register a check
	check1 := &structs.HealthCheck{
		Node:        config.NodeName,
		CheckID:     "service:redis",
		Name:        "redischeck",
		Status:      structs.HealthPassing,
		ServiceID:   "redis",
		ServiceName: "redis",
	}
	if err := agent.AddCheck(check1, nil, false, ""); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Re-registering the service preserves the state of the check
	chkTypes := CheckTypes{&CheckType{TTL: 30 * time.Second}}
	if err := agent.AddService(svc, chkTypes, false, ""); err != nil {
		t.Fatalf("err: %s", err)
	}
	check, ok := agent.state.Checks()["service:redis"]
	if !ok {
		t.Fatalf("missing check")
	}
	if check.Status != structs.HealthPassing {
		t.Fatalf("bad: %s", check.Status)
	}
}

func TestAgent_NodeMaintenanceMode(t *testing.T) {
	config := nextConfig()
	dir, agent := makeAgent(t, config)
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	// Enter maintenance mode for the node
	agent.EnableNodeMaintenance("broken", "mytoken")

	// Make sure the critical health check was added
	check, ok := agent.state.Checks()[nodeMaintCheckID]
	if !ok {
		t.Fatalf("should have registered critical node check")
	}

	// Check that the token was used to register the check
	if token := agent.state.CheckToken(nodeMaintCheckID); token != "mytoken" {
		t.Fatalf("expected 'mytoken', got: '%s'", token)
	}

	// Ensure the reason was set in notes
	if check.Notes != "broken" {
		t.Fatalf("bad: %#v", check)
	}

	// Leave maintenance mode
	agent.DisableNodeMaintenance()

	// Ensure the check was deregistered
	if _, ok := agent.state.Checks()[nodeMaintCheckID]; ok {
		t.Fatalf("should have deregistered critical node check")
	}

	// Enter maintenance mode without passing a reason
	agent.EnableNodeMaintenance("", "")

	// Make sure the check was registered with the default note
	check, ok = agent.state.Checks()[nodeMaintCheckID]
	if !ok {
		t.Fatalf("should have registered critical node check")
	}
	if check.Notes != defaultNodeMaintReason {
		t.Fatalf("bad: %#v", check)
	}
}

func TestAgent_checkStateSnapshot(t *testing.T) {
	config := nextConfig()
	dir, agent := makeAgent(t, config)
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	// First register a service
	svc := &structs.NodeService{
		ID:      "redis",
		Service: "redis",
		Tags:    []string{"foo"},
		Port:    8000,
	}
	if err := agent.AddService(svc, nil, false, ""); err != nil {
		t.Fatalf("err: %v", err)
	}

	// Register a check
	check1 := &structs.HealthCheck{
		Node:        config.NodeName,
		CheckID:     "service:redis",
		Name:        "redischeck",
		Status:      structs.HealthPassing,
		ServiceID:   "redis",
		ServiceName: "redis",
	}
	if err := agent.AddCheck(check1, nil, true, ""); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Snapshot the state
	snap := agent.snapshotCheckState()

	// Unload all of the checks
	if err := agent.unloadChecks(); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Reload the checks
	if err := agent.loadChecks(config); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Restore the state
	agent.restoreCheckState(snap)

	// Search for the check
	out, ok := agent.state.Checks()[check1.CheckID]
	if !ok {
		t.Fatalf("check should have been registered")
	}

	// Make sure state was restored
	if out.Status != structs.HealthPassing {
		t.Fatalf("should have restored check state")
	}
}

func TestAgent_loadChecks_checkFails(t *testing.T) {
	config := nextConfig()
	dir, agent := makeAgent(t, config)
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	// Persist a health check with an invalid service ID
	check := &structs.HealthCheck{
		Node:      config.NodeName,
		CheckID:   "service:redis",
		Name:      "redischeck",
		Status:    structs.HealthPassing,
		ServiceID: "nope",
	}
	if err := agent.persistCheck(check, nil); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Check to make sure the check was persisted
	checkHash := checkIDHash(check.CheckID)
	checkPath := filepath.Join(config.DataDir, checksDir, checkHash)
	if _, err := os.Stat(checkPath); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Try loading the checks from the persisted files
	if err := agent.loadChecks(config); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Ensure the erroneous check was purged
	if _, err := os.Stat(checkPath); err == nil {
		t.Fatalf("should have purged check")
	}
}

func TestAgent_persistCheckState(t *testing.T) {
	config := nextConfig()
	dir, agent := makeAgent(t, config)
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	// Create the TTL check to persist
	check := &CheckTTL{
		CheckID: "check1",
		TTL:     10 * time.Minute,
	}

	// Persist some check state for the check
	err := agent.persistCheckState(check, structs.HealthCritical, "nope")
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	// Check the persisted file exists and has the content
	file := filepath.Join(agent.config.DataDir, checkStateDir, stringHash("check1"))
	buf, err := ioutil.ReadFile(file)
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	// Decode the state
	var p persistedCheckState
	if err := json.Unmarshal(buf, &p); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Check the fields
	if p.CheckID != "check1" {
		t.Fatalf("bad: %#v", p)
	}
	if p.Output != "nope" {
		t.Fatalf("bad: %#v", p)
	}
	if p.Status != structs.HealthCritical {
		t.Fatalf("bad: %#v", p)
	}

	// Check the expiration time was set
	if p.Expires < time.Now().Unix() {
		t.Fatalf("bad: %#v", p)
	}
}

func TestAgent_loadCheckState(t *testing.T) {
	config := nextConfig()
	dir, agent := makeAgent(t, config)
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	// Create a check whose state will expire immediately
	check := &CheckTTL{
		CheckID: "check1",
		TTL:     0,
	}

	// Persist the check state
	err := agent.persistCheckState(check, structs.HealthPassing, "yup")
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	// Try to load the state
	health := &structs.HealthCheck{
		CheckID: "check1",
		Status:  structs.HealthCritical,
	}
	if err := agent.loadCheckState(health); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Should not have restored the status due to expiration
	if health.Status != structs.HealthCritical {
		t.Fatalf("bad: %#v", health)
	}
	if health.Output != "" {
		t.Fatalf("bad: %#v", health)
	}

	// Should have purged the state
	file := filepath.Join(agent.config.DataDir, checksDir, stringHash("check1"))
	if _, err := os.Stat(file); !os.IsNotExist(err) {
		t.Fatalf("should have purged state")
	}

	// Set a TTL which will not expire before we check it
	check.TTL = time.Minute
	err = agent.persistCheckState(check, structs.HealthPassing, "yup")
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	// Try to load
	if err := agent.loadCheckState(health); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Should have restored
	if health.Status != structs.HealthPassing {
		t.Fatalf("bad: %#v", health)
	}
	if health.Output != "yup" {
		t.Fatalf("bad: %#v", health)
	}
}

func TestAgent_purgeCheckState(t *testing.T) {
	config := nextConfig()
	dir, agent := makeAgent(t, config)
	defer os.RemoveAll(dir)
	defer agent.Shutdown()

	// No error if the state does not exist
	if err := agent.purgeCheckState("check1"); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Persist some state to the data dir
	check := &CheckTTL{
		CheckID: "check1",
		TTL:     time.Minute,
	}
	err := agent.persistCheckState(check, structs.HealthPassing, "yup")
	if err != nil {
		t.Fatalf("err: %s", err)
	}

	// Purge the check state
	if err := agent.purgeCheckState("check1"); err != nil {
		t.Fatalf("err: %s", err)
	}

	// Removed the file
	file := filepath.Join(agent.config.DataDir, checkStateDir, stringHash("check1"))
	if _, err := os.Stat(file); !os.IsNotExist(err) {
		t.Fatalf("should have removed file")
	}
}

func TestAgent_GetCoordinate(t *testing.T) {
	check := func(server bool) {
		config := nextConfig()
		config.Server = server
		dir, agent := makeAgent(t, config)
		defer os.RemoveAll(dir)
		defer agent.Shutdown()

		// This doesn't verify the returned coordinate, but it makes
		// sure that the agent chooses the correct Serf instance,
		// depending on how it's configured as a client or a server.
		// If it chooses the wrong one, this will crash.
		if _, err := agent.GetCoordinate(); err != nil {
			t.Fatalf("err: %s", err)
		}
	}

	check(true)
	check(false)
}