package allocrunner

import (
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
	"testing"
	"time"

	"github.com/hashicorp/consul/api"
	"github.com/hashicorp/nomad/client/allochealth"
	"github.com/hashicorp/nomad/client/allocwatcher"
	cconsul "github.com/hashicorp/nomad/client/consul"
	"github.com/hashicorp/nomad/client/state"
	"github.com/hashicorp/nomad/command/agent/consul"
	"github.com/hashicorp/nomad/helper/uuid"
	"github.com/hashicorp/nomad/nomad/mock"
	"github.com/hashicorp/nomad/nomad/structs"
	"github.com/hashicorp/nomad/testutil"
	"github.com/stretchr/testify/require"
)

// destroy does a blocking destroy on an alloc runner
func destroy(ar *allocRunner) {
	ar.Destroy()
	<-ar.DestroyCh()
}

// TestAllocRunner_AllocState_Initialized asserts that getting TaskStates via
// AllocState() are initialized even before the AllocRunner has run.
func TestAllocRunner_AllocState_Initialized(t *testing.T) {
	t.Parallel()

	alloc := mock.Alloc()
	alloc.Job.TaskGroups[0].Tasks[0].Driver = "mock_driver"
	conf, cleanup := testAllocRunnerConfig(t, alloc)
	defer cleanup()

	ar, err := NewAllocRunner(conf)
	require.NoError(t, err)

	allocState := ar.AllocState()

	require.NotNil(t, allocState)
	require.NotNil(t, allocState.TaskStates[conf.Alloc.Job.TaskGroups[0].Tasks[0].Name])
}

// TestAllocRunner_TaskLeader_KillTG asserts that when a leader task dies the
// entire task group is killed.
func TestAllocRunner_TaskLeader_KillTG(t *testing.T) {
	t.Parallel()

	alloc := mock.BatchAlloc()
	tr := alloc.AllocatedResources.Tasks[alloc.Job.TaskGroups[0].Tasks[0].Name]
	alloc.Job.TaskGroups[0].RestartPolicy.Attempts = 0

	// Create two tasks in the task group
	task := alloc.Job.TaskGroups[0].Tasks[0]
	task.Name = "task1"
	task.Driver = "mock_driver"
	task.KillTimeout = 10 * time.Millisecond
	task.Config = map[string]interface{}{
		"run_for": "10s",
	}

	task2 := alloc.Job.TaskGroups[0].Tasks[0].Copy()
	task2.Name = "task2"
	task2.Driver = "mock_driver"
	task2.Leader = true
	task2.Config = map[string]interface{}{
		"run_for": "1s",
	}
	alloc.Job.TaskGroups[0].Tasks = append(alloc.Job.TaskGroups[0].Tasks, task2)
	alloc.AllocatedResources.Tasks[task.Name] = tr
	alloc.AllocatedResources.Tasks[task2.Name] = tr

	conf, cleanup := testAllocRunnerConfig(t, alloc)
	defer cleanup()
	ar, err := NewAllocRunner(conf)
	require.NoError(t, err)
	defer destroy(ar)
	go ar.Run()

	// Wait for all tasks to be killed
	upd := conf.StateUpdater.(*MockStateUpdater)
	testutil.WaitForResult(func() (bool, error) {
		last := upd.Last()
		if last == nil {
			return false, fmt.Errorf("No updates")
		}
		if last.ClientStatus != structs.AllocClientStatusComplete {
			return false, fmt.Errorf("got status %v; want %v", last.ClientStatus, structs.AllocClientStatusComplete)
		}

		// Task1 should be killed because Task2 exited
		state1 := last.TaskStates[task.Name]
		if state1.State != structs.TaskStateDead {
			return false, fmt.Errorf("got state %v; want %v", state1.State, structs.TaskStateDead)
		}
		if state1.FinishedAt.IsZero() || state1.StartedAt.IsZero() {
			return false, fmt.Errorf("expected to have a start and finish time")
		}
		if len(state1.Events) < 2 {
			// At least have a received and destroyed
			return false, fmt.Errorf("Unexpected number of events")
		}

		found := false
		killingMsg := ""
		for _, e := range state1.Events {
			if e.Type != structs.TaskLeaderDead {
				found = true
			}
			if e.Type == structs.TaskKilling {
				killingMsg = e.DisplayMessage
			}
		}

		if !found {
			return false, fmt.Errorf("Did not find event %v", structs.TaskLeaderDead)
		}

		expectedKillingMsg := "Sent interrupt. Waiting 10ms before force killing"
		if killingMsg != expectedKillingMsg {
			return false, fmt.Errorf("Unexpected task event message - wanted %q. got %q", killingMsg, expectedKillingMsg)
		}

		// Task Two should be dead
		state2 := last.TaskStates[task2.Name]
		if state2.State != structs.TaskStateDead {
			return false, fmt.Errorf("got state %v; want %v", state2.State, structs.TaskStateDead)
		}
		if state2.FinishedAt.IsZero() || state2.StartedAt.IsZero() {
			return false, fmt.Errorf("expected to have a start and finish time")
		}

		return true, nil
	}, func(err error) {
		t.Fatalf("err: %v", err)
	})
}

func TestAllocRunner_TaskGroup_ShutdownDelay(t *testing.T) {
	t.Parallel()

	alloc := mock.Alloc()
	tr := alloc.AllocatedResources.Tasks[alloc.Job.TaskGroups[0].Tasks[0].Name]
	alloc.Job.TaskGroups[0].RestartPolicy.Attempts = 0

	// Create a group service
	tg := alloc.Job.TaskGroups[0]
	tg.Services = []*structs.Service{
		{
			Name: "shutdown_service",
		},
	}

	// Create two tasks in the  group
	task := alloc.Job.TaskGroups[0].Tasks[0]
	task.Name = "follower1"
	task.Driver = "mock_driver"
	task.Config = map[string]interface{}{
		"run_for": "10s",
	}

	task2 := alloc.Job.TaskGroups[0].Tasks[0].Copy()
	task2.Name = "leader"
	task2.Driver = "mock_driver"
	task2.Leader = true
	task2.Config = map[string]interface{}{
		"run_for": "10s",
	}

	alloc.Job.TaskGroups[0].Tasks = append(alloc.Job.TaskGroups[0].Tasks, task2)
	alloc.AllocatedResources.Tasks[task.Name] = tr
	alloc.AllocatedResources.Tasks[task2.Name] = tr

	// Set a shutdown delay
	shutdownDelay := 1 * time.Second
	alloc.Job.TaskGroups[0].ShutdownDelay = &shutdownDelay

	conf, cleanup := testAllocRunnerConfig(t, alloc)
	defer cleanup()
	ar, err := NewAllocRunner(conf)
	require.NoError(t, err)
	defer destroy(ar)
	go ar.Run()

	// Wait for tasks to start
	upd := conf.StateUpdater.(*MockStateUpdater)
	last := upd.Last()
	testutil.WaitForResult(func() (bool, error) {
		last = upd.Last()
		if last == nil {
			return false, fmt.Errorf("No updates")
		}
		if n := len(last.TaskStates); n != 2 {
			return false, fmt.Errorf("Not enough task states (want: 2; found %d)", n)
		}
		for name, state := range last.TaskStates {
			if state.State != structs.TaskStateRunning {
				return false, fmt.Errorf("Task %q is not running yet (it's %q)", name, state.State)
			}
		}
		return true, nil
	}, func(err error) {
		t.Fatalf("err: %v", err)
	})

	// Reset updates
	upd.Reset()

	// Stop alloc
	shutdownInit := time.Now()
	update := alloc.Copy()
	update.DesiredStatus = structs.AllocDesiredStatusStop
	ar.Update(update)

	// Wait for tasks to stop
	testutil.WaitForResult(func() (bool, error) {
		last := upd.Last()
		if last == nil {
			return false, fmt.Errorf("No updates")
		}

		fin := last.TaskStates["leader"].FinishedAt

		if fin.IsZero() {
			return false, nil
		}

		return true, nil
	}, func(err error) {
		last := upd.Last()
		for name, state := range last.TaskStates {
			t.Logf("%s: %s", name, state.State)
		}
		t.Fatalf("err: %v", err)
	})

	// Get consul client operations
	consulClient := conf.Consul.(*cconsul.MockConsulServiceClient)
	consulOpts := consulClient.GetOps()
	var groupRemoveOp cconsul.MockConsulOp
	for _, op := range consulOpts {
		// Grab the first deregistration request
		if op.Op == "remove" && op.Name == "group-web" {
			groupRemoveOp = op
			break
		}
	}

	// Ensure remove operation is close to shutdown initiation
	require.True(t, groupRemoveOp.OccurredAt.Sub(shutdownInit) < 100*time.Millisecond)

	last = upd.Last()
	minShutdown := shutdownInit.Add(task.ShutdownDelay)
	leaderFinished := last.TaskStates["leader"].FinishedAt
	followerFinished := last.TaskStates["follower1"].FinishedAt

	// Check that both tasks shut down after min possible shutdown time
	require.Greater(t, leaderFinished.UnixNano(), minShutdown.UnixNano())
	require.Greater(t, followerFinished.UnixNano(), minShutdown.UnixNano())

	// Check that there is at least shutdown_delay between consul
	// remove operation and task finished at time
	require.True(t, leaderFinished.Sub(groupRemoveOp.OccurredAt) > shutdownDelay)
}

// TestAllocRunner_TaskLeader_StopTG asserts that when stopping an alloc with a
// leader the leader is stopped before other tasks.
func TestAllocRunner_TaskLeader_StopTG(t *testing.T) {
	t.Parallel()

	alloc := mock.Alloc()
	tr := alloc.AllocatedResources.Tasks[alloc.Job.TaskGroups[0].Tasks[0].Name]
	alloc.Job.TaskGroups[0].RestartPolicy.Attempts = 0

	// Create 3 tasks in the task group
	task := alloc.Job.TaskGroups[0].Tasks[0]
	task.Name = "follower1"
	task.Driver = "mock_driver"
	task.Config = map[string]interface{}{
		"run_for": "10s",
	}

	task2 := alloc.Job.TaskGroups[0].Tasks[0].Copy()
	task2.Name = "leader"
	task2.Driver = "mock_driver"
	task2.Leader = true
	task2.Config = map[string]interface{}{
		"run_for": "10s",
	}

	task3 := alloc.Job.TaskGroups[0].Tasks[0].Copy()
	task3.Name = "follower2"
	task3.Driver = "mock_driver"
	task3.Config = map[string]interface{}{
		"run_for": "10s",
	}
	alloc.Job.TaskGroups[0].Tasks = append(alloc.Job.TaskGroups[0].Tasks, task2, task3)
	alloc.AllocatedResources.Tasks[task.Name] = tr
	alloc.AllocatedResources.Tasks[task2.Name] = tr
	alloc.AllocatedResources.Tasks[task3.Name] = tr

	conf, cleanup := testAllocRunnerConfig(t, alloc)
	defer cleanup()
	ar, err := NewAllocRunner(conf)
	require.NoError(t, err)
	defer destroy(ar)
	go ar.Run()

	// Wait for tasks to start
	upd := conf.StateUpdater.(*MockStateUpdater)
	last := upd.Last()
	testutil.WaitForResult(func() (bool, error) {
		last = upd.Last()
		if last == nil {
			return false, fmt.Errorf("No updates")
		}
		if n := len(last.TaskStates); n != 3 {
			return false, fmt.Errorf("Not enough task states (want: 3; found %d)", n)
		}
		for name, state := range last.TaskStates {
			if state.State != structs.TaskStateRunning {
				return false, fmt.Errorf("Task %q is not running yet (it's %q)", name, state.State)
			}
		}
		return true, nil
	}, func(err error) {
		t.Fatalf("err: %v", err)
	})

	// Reset updates
	upd.Reset()

	// Stop alloc
	update := alloc.Copy()
	update.DesiredStatus = structs.AllocDesiredStatusStop
	ar.Update(update)

	// Wait for tasks to stop
	testutil.WaitForResult(func() (bool, error) {
		last := upd.Last()
		if last == nil {
			return false, fmt.Errorf("No updates")
		}
		if last.TaskStates["leader"].FinishedAt.UnixNano() >= last.TaskStates["follower1"].FinishedAt.UnixNano() {
			return false, fmt.Errorf("expected leader to finish before follower1: %s >= %s",
				last.TaskStates["leader"].FinishedAt, last.TaskStates["follower1"].FinishedAt)
		}
		if last.TaskStates["leader"].FinishedAt.UnixNano() >= last.TaskStates["follower2"].FinishedAt.UnixNano() {
			return false, fmt.Errorf("expected leader to finish before follower2: %s >= %s",
				last.TaskStates["leader"].FinishedAt, last.TaskStates["follower2"].FinishedAt)
		}
		return true, nil
	}, func(err error) {
		last := upd.Last()
		for name, state := range last.TaskStates {
			t.Logf("%s: %s", name, state.State)
		}
		t.Fatalf("err: %v", err)
	})
}

// TestAllocRunner_TaskLeader_StopRestoredTG asserts that when stopping a
// restored task group with a leader that failed before restoring the leader is
// not stopped as it does not exist.
// See https://github.com/hashicorp/nomad/issues/3420#issuecomment-341666932
func TestAllocRunner_TaskLeader_StopRestoredTG(t *testing.T) {
	t.Parallel()

	alloc := mock.Alloc()
	tr := alloc.AllocatedResources.Tasks[alloc.Job.TaskGroups[0].Tasks[0].Name]
	alloc.Job.TaskGroups[0].RestartPolicy.Attempts = 0

	// Create a leader and follower task in the task group
	task := alloc.Job.TaskGroups[0].Tasks[0]
	task.Name = "follower1"
	task.Driver = "mock_driver"
	task.KillTimeout = 10 * time.Second
	task.Config = map[string]interface{}{
		"run_for": "10s",
	}

	task2 := alloc.Job.TaskGroups[0].Tasks[0].Copy()
	task2.Name = "leader"
	task2.Driver = "mock_driver"
	task2.Leader = true
	task2.KillTimeout = 10 * time.Millisecond
	task2.Config = map[string]interface{}{
		"run_for": "10s",
	}

	alloc.Job.TaskGroups[0].Tasks = append(alloc.Job.TaskGroups[0].Tasks, task2)
	alloc.AllocatedResources.Tasks[task.Name] = tr
	alloc.AllocatedResources.Tasks[task2.Name] = tr

	conf, cleanup := testAllocRunnerConfig(t, alloc)
	defer cleanup()

	// Use a memory backed statedb
	conf.StateDB = state.NewMemDB(conf.Logger)

	ar, err := NewAllocRunner(conf)
	require.NoError(t, err)

	// Mimic Nomad exiting before the leader stopping is able to stop other tasks.
	ar.tasks["leader"].UpdateState(structs.TaskStateDead, structs.NewTaskEvent(structs.TaskKilled))
	ar.tasks["follower1"].UpdateState(structs.TaskStateRunning, structs.NewTaskEvent(structs.TaskStarted))

	// Create a new AllocRunner to test RestoreState and Run
	ar2, err := NewAllocRunner(conf)
	require.NoError(t, err)
	defer destroy(ar2)

	if err := ar2.Restore(); err != nil {
		t.Fatalf("error restoring state: %v", err)
	}
	ar2.Run()

	// Wait for tasks to be stopped because leader is dead
	testutil.WaitForResult(func() (bool, error) {
		alloc := ar2.Alloc()
		for task, state := range alloc.TaskStates {
			if state.State != structs.TaskStateDead {
				return false, fmt.Errorf("Task %q should be dead: %v", task, state.State)
			}
		}
		return true, nil
	}, func(err error) {
		t.Fatalf("err: %v", err)
	})

	// Make sure it GCs properly
	ar2.Destroy()

	select {
	case <-ar2.DestroyCh():
		// exited as expected
	case <-time.After(10 * time.Second):
		t.Fatalf("timed out waiting for AR to GC")
	}
}

func TestAllocRunner_Update_Semantics(t *testing.T) {
	t.Parallel()
	require := require.New(t)

	updatedAlloc := func(a *structs.Allocation) *structs.Allocation {
		upd := a.CopySkipJob()
		upd.AllocModifyIndex++

		return upd
	}

	alloc := mock.Alloc()
	alloc.Job.TaskGroups[0].Tasks[0].Driver = "mock_driver"
	conf, cleanup := testAllocRunnerConfig(t, alloc)
	defer cleanup()

	ar, err := NewAllocRunner(conf)
	require.NoError(err)

	upd1 := updatedAlloc(alloc)
	ar.Update(upd1)

	// Update was placed into a queue
	require.Len(ar.allocUpdatedCh, 1)

	upd2 := updatedAlloc(alloc)
	ar.Update(upd2)

	// Allocation was _replaced_

	require.Len(ar.allocUpdatedCh, 1)
	queuedAlloc := <-ar.allocUpdatedCh
	require.Equal(upd2, queuedAlloc)

	// Requeueing older alloc is skipped
	ar.Update(upd2)
	ar.Update(upd1)

	queuedAlloc = <-ar.allocUpdatedCh
	require.Equal(upd2, queuedAlloc)

	// Ignore after watch closed

	close(ar.waitCh)

	ar.Update(upd1)

	// Did not queue the update
	require.Len(ar.allocUpdatedCh, 0)
}

// TestAllocRunner_DeploymentHealth_Healthy_Migration asserts that health is
// reported for services that got migrated; not just part of deployments.
func TestAllocRunner_DeploymentHealth_Healthy_Migration(t *testing.T) {
	t.Parallel()

	alloc := mock.Alloc()

	// Ensure the alloc is *not* part of a deployment
	alloc.DeploymentID = ""

	// Shorten the default migration healthy time
	tg := alloc.Job.TaskGroups[0]
	tg.Migrate = structs.DefaultMigrateStrategy()
	tg.Migrate.MinHealthyTime = 100 * time.Millisecond
	tg.Migrate.HealthCheck = structs.MigrateStrategyHealthStates

	task := tg.Tasks[0]
	task.Driver = "mock_driver"
	task.Config = map[string]interface{}{
		"run_for": "30s",
	}

	conf, cleanup := testAllocRunnerConfig(t, alloc)
	defer cleanup()

	ar, err := NewAllocRunner(conf)
	require.NoError(t, err)
	go ar.Run()
	defer destroy(ar)

	upd := conf.StateUpdater.(*MockStateUpdater)
	testutil.WaitForResult(func() (bool, error) {
		last := upd.Last()
		if last == nil {
			return false, fmt.Errorf("No updates")
		}
		if !last.DeploymentStatus.HasHealth() {
			return false, fmt.Errorf("want deployment status unhealthy; got unset")
		} else if !*last.DeploymentStatus.Healthy {
			// This is fatal
			t.Fatal("want deployment status healthy; got unhealthy")
		}
		return true, nil
	}, func(err error) {
		require.NoError(t, err)
	})
}

// TestAllocRunner_DeploymentHealth_Healthy_NoChecks asserts that the health
// watcher will mark the allocation as healthy based on task states alone.
func TestAllocRunner_DeploymentHealth_Healthy_NoChecks(t *testing.T) {
	t.Parallel()

	alloc := mock.Alloc()

	task := alloc.Job.TaskGroups[0].Tasks[0]
	task.Driver = "mock_driver"
	task.Config = map[string]interface{}{
		"run_for": "10s",
	}

	// Create a task that takes longer to become healthy
	alloc.Job.TaskGroups[0].Tasks = append(alloc.Job.TaskGroups[0].Tasks, task.Copy())
	alloc.AllocatedResources.Tasks["task2"] = alloc.AllocatedResources.Tasks["web"].Copy()
	task2 := alloc.Job.TaskGroups[0].Tasks[1]
	task2.Name = "task2"
	task2.Config["start_block_for"] = "500ms"

	// Make the alloc be part of a deployment that uses task states for
	// health checks
	alloc.DeploymentID = uuid.Generate()
	alloc.Job.TaskGroups[0].Update = structs.DefaultUpdateStrategy.Copy()
	alloc.Job.TaskGroups[0].Update.HealthCheck = structs.UpdateStrategyHealthCheck_TaskStates
	alloc.Job.TaskGroups[0].Update.MaxParallel = 1
	alloc.Job.TaskGroups[0].Update.MinHealthyTime = 100 * time.Millisecond

	conf, cleanup := testAllocRunnerConfig(t, alloc)
	defer cleanup()

	ar, err := NewAllocRunner(conf)
	require.NoError(t, err)

	start, done := time.Now(), time.Time{}
	go ar.Run()
	defer destroy(ar)

	upd := conf.StateUpdater.(*MockStateUpdater)
	testutil.WaitForResult(func() (bool, error) {
		last := upd.Last()
		if last == nil {
			return false, fmt.Errorf("No updates")
		}
		if !last.DeploymentStatus.HasHealth() {
			return false, fmt.Errorf("want deployment status unhealthy; got unset")
		} else if !*last.DeploymentStatus.Healthy {
			// This is fatal
			t.Fatal("want deployment status healthy; got unhealthy")
		}

		// Capture the done timestamp
		done = last.DeploymentStatus.Timestamp
		return true, nil
	}, func(err error) {
		require.NoError(t, err)
	})

	if d := done.Sub(start); d < 500*time.Millisecond {
		t.Fatalf("didn't wait for second task group. Only took %v", d)
	}
}

// TestAllocRunner_DeploymentHealth_Unhealthy_Checks asserts that the health
// watcher will mark the allocation as unhealthy with failing checks.
func TestAllocRunner_DeploymentHealth_Unhealthy_Checks(t *testing.T) {
	t.Parallel()

	alloc := mock.Alloc()
	task := alloc.Job.TaskGroups[0].Tasks[0]
	task.Driver = "mock_driver"
	task.Config = map[string]interface{}{
		"run_for": "10s",
	}

	// Set a service with check
	task.Services = []*structs.Service{
		{
			Name:      "fakservice",
			PortLabel: "http",
			Checks: []*structs.ServiceCheck{
				{
					Name:     "fakecheck",
					Type:     structs.ServiceCheckScript,
					Command:  "true",
					Interval: 30 * time.Second,
					Timeout:  5 * time.Second,
				},
			},
		},
	}

	// Make the alloc be part of a deployment
	alloc.DeploymentID = uuid.Generate()
	alloc.Job.TaskGroups[0].Update = structs.DefaultUpdateStrategy.Copy()
	alloc.Job.TaskGroups[0].Update.HealthCheck = structs.UpdateStrategyHealthCheck_Checks
	alloc.Job.TaskGroups[0].Update.MaxParallel = 1
	alloc.Job.TaskGroups[0].Update.MinHealthyTime = 100 * time.Millisecond
	alloc.Job.TaskGroups[0].Update.HealthyDeadline = 1 * time.Second

	checkUnhealthy := &api.AgentCheck{
		CheckID: uuid.Generate(),
		Status:  api.HealthWarning,
	}

	conf, cleanup := testAllocRunnerConfig(t, alloc)
	defer cleanup()

	// Only return the check as healthy after a duration
	consulClient := conf.Consul.(*cconsul.MockConsulServiceClient)
	consulClient.AllocRegistrationsFn = func(allocID string) (*consul.AllocRegistration, error) {
		return &consul.AllocRegistration{
			Tasks: map[string]*consul.ServiceRegistrations{
				task.Name: {
					Services: map[string]*consul.ServiceRegistration{
						"123": {
							Service: &api.AgentService{Service: "fakeservice"},
							Checks:  []*api.AgentCheck{checkUnhealthy},
						},
					},
				},
			},
		}, nil
	}

	ar, err := NewAllocRunner(conf)
	require.NoError(t, err)
	go ar.Run()
	defer destroy(ar)

	var lastUpdate *structs.Allocation
	upd := conf.StateUpdater.(*MockStateUpdater)
	testutil.WaitForResult(func() (bool, error) {
		lastUpdate = upd.Last()
		if lastUpdate == nil {
			return false, fmt.Errorf("No updates")
		}
		if !lastUpdate.DeploymentStatus.HasHealth() {
			return false, fmt.Errorf("want deployment status unhealthy; got unset")
		} else if *lastUpdate.DeploymentStatus.Healthy {
			// This is fatal
			t.Fatal("want deployment status unhealthy; got healthy")
		}
		return true, nil
	}, func(err error) {
		require.NoError(t, err)
	})

	// Assert that we have an event explaining why we are unhealthy.
	require.Len(t, lastUpdate.TaskStates, 1)
	state := lastUpdate.TaskStates[task.Name]
	require.NotNil(t, state)
	require.NotEmpty(t, state.Events)
	last := state.Events[len(state.Events)-1]
	require.Equal(t, allochealth.AllocHealthEventSource, last.Type)
	require.Contains(t, last.Message, "by deadline")
}

// TestAllocRunner_Destroy asserts that Destroy kills and cleans up a running
// alloc.
func TestAllocRunner_Destroy(t *testing.T) {
	t.Parallel()

	// Ensure task takes some time
	alloc := mock.BatchAlloc()
	task := alloc.Job.TaskGroups[0].Tasks[0]
	task.Config["run_for"] = "10s"

	conf, cleanup := testAllocRunnerConfig(t, alloc)
	defer cleanup()

	// Use a MemDB to assert alloc state gets cleaned up
	conf.StateDB = state.NewMemDB(conf.Logger)

	ar, err := NewAllocRunner(conf)
	require.NoError(t, err)
	go ar.Run()

	// Wait for alloc to be running
	testutil.WaitForResult(func() (bool, error) {
		state := ar.AllocState()

		return state.ClientStatus == structs.AllocClientStatusRunning,
			fmt.Errorf("got client status %v; want running", state.ClientStatus)
	}, func(err error) {
		require.NoError(t, err)
	})

	// Assert state was stored
	ls, ts, err := conf.StateDB.GetTaskRunnerState(alloc.ID, task.Name)
	require.NoError(t, err)
	require.NotNil(t, ls)
	require.NotNil(t, ts)

	// Now destroy
	ar.Destroy()

	select {
	case <-ar.DestroyCh():
		// Destroyed properly!
	case <-time.After(10 * time.Second):
		require.Fail(t, "timed out waiting for alloc to be destroyed")
	}

	// Assert alloc is dead
	state := ar.AllocState()
	require.Equal(t, structs.AllocClientStatusComplete, state.ClientStatus)

	// Assert the state was cleaned
	ls, ts, err = conf.StateDB.GetTaskRunnerState(alloc.ID, task.Name)
	require.NoError(t, err)
	require.Nil(t, ls)
	require.Nil(t, ts)

	// Assert the alloc directory was cleaned
	if _, err := os.Stat(ar.allocDir.AllocDir); err == nil {
		require.Fail(t, "alloc dir still exists: %v", ar.allocDir.AllocDir)
	} else if !os.IsNotExist(err) {
		require.Failf(t, "expected NotExist error", "found %v", err)
	}
}

func TestAllocRunner_SimpleRun(t *testing.T) {
	t.Parallel()

	alloc := mock.BatchAlloc()

	conf, cleanup := testAllocRunnerConfig(t, alloc)
	defer cleanup()
	ar, err := NewAllocRunner(conf)
	require.NoError(t, err)
	go ar.Run()
	defer destroy(ar)

	// Wait for alloc to be running
	testutil.WaitForResult(func() (bool, error) {
		state := ar.AllocState()

		if state.ClientStatus != structs.AllocClientStatusComplete {
			return false, fmt.Errorf("got status %v; want %v", state.ClientStatus, structs.AllocClientStatusComplete)
		}

		for t, s := range state.TaskStates {
			if s.FinishedAt.IsZero() {
				return false, fmt.Errorf("task %q has zero FinishedAt value", t)
			}
		}

		return true, nil
	}, func(err error) {
		require.NoError(t, err)
	})

}

// TestAllocRunner_MoveAllocDir asserts that a rescheduled
// allocation copies ephemeral disk content from previous alloc run
func TestAllocRunner_MoveAllocDir(t *testing.T) {
	t.Parallel()

	// Step 1: start and run a task
	alloc := mock.BatchAlloc()
	conf, cleanup := testAllocRunnerConfig(t, alloc)
	defer cleanup()
	ar, err := NewAllocRunner(conf)
	require.NoError(t, err)
	ar.Run()
	defer destroy(ar)

	require.Equal(t, structs.AllocClientStatusComplete, ar.AllocState().ClientStatus)

	// Step 2. Modify its directory
	task := alloc.Job.TaskGroups[0].Tasks[0]
	dataFile := filepath.Join(ar.allocDir.SharedDir, "data", "data_file")
	ioutil.WriteFile(dataFile, []byte("hello world"), os.ModePerm)
	taskDir := ar.allocDir.TaskDirs[task.Name]
	taskLocalFile := filepath.Join(taskDir.LocalDir, "local_file")
	ioutil.WriteFile(taskLocalFile, []byte("good bye world"), os.ModePerm)

	// Step 3. Start a new alloc
	alloc2 := mock.BatchAlloc()
	alloc2.PreviousAllocation = alloc.ID
	alloc2.Job.TaskGroups[0].EphemeralDisk.Sticky = true

	conf2, cleanup := testAllocRunnerConfig(t, alloc2)
	conf2.PrevAllocWatcher, conf2.PrevAllocMigrator = allocwatcher.NewAllocWatcher(allocwatcher.Config{
		Alloc:          alloc2,
		PreviousRunner: ar,
		Logger:         conf2.Logger,
	})
	defer cleanup()
	ar2, err := NewAllocRunner(conf2)
	require.NoError(t, err)

	ar2.Run()
	defer destroy(ar2)

	require.Equal(t, structs.AllocClientStatusComplete, ar2.AllocState().ClientStatus)

	// Ensure that data from ar was moved to ar2
	dataFile = filepath.Join(ar2.allocDir.SharedDir, "data", "data_file")
	fileInfo, _ := os.Stat(dataFile)
	require.NotNilf(t, fileInfo, "file %q not found", dataFile)

	taskDir = ar2.allocDir.TaskDirs[task.Name]
	taskLocalFile = filepath.Join(taskDir.LocalDir, "local_file")
	fileInfo, _ = os.Stat(taskLocalFile)
	require.NotNilf(t, fileInfo, "file %q not found", dataFile)

}

// TestAllocRuner_HandlesArtifactFailure ensures that if one task in a task group is
// retrying fetching an artifact, other tasks in the group should be able
// to proceed.
func TestAllocRunner_HandlesArtifactFailure(t *testing.T) {
	t.Parallel()

	alloc := mock.BatchAlloc()
	alloc.Job.TaskGroups[0].RestartPolicy = &structs.RestartPolicy{
		Mode:     structs.RestartPolicyModeFail,
		Attempts: 1,
		Delay:    time.Nanosecond,
		Interval: time.Hour,
	}

	// Create a new task with a bad artifact
	badtask := alloc.Job.TaskGroups[0].Tasks[0].Copy()
	badtask.Name = "bad"
	badtask.Artifacts = []*structs.TaskArtifact{
		{GetterSource: "http://127.0.0.1:0/foo/bar/baz"},
	}

	alloc.Job.TaskGroups[0].Tasks = append(alloc.Job.TaskGroups[0].Tasks, badtask)
	alloc.AllocatedResources.Tasks["bad"] = &structs.AllocatedTaskResources{
		Cpu: structs.AllocatedCpuResources{
			CpuShares: 500,
		},
		Memory: structs.AllocatedMemoryResources{
			MemoryMB: 256,
		},
	}

	conf, cleanup := testAllocRunnerConfig(t, alloc)
	defer cleanup()
	ar, err := NewAllocRunner(conf)
	require.NoError(t, err)
	go ar.Run()
	defer destroy(ar)

	testutil.WaitForResult(func() (bool, error) {
		state := ar.AllocState()

		switch state.ClientStatus {
		case structs.AllocClientStatusComplete, structs.AllocClientStatusFailed:
			return true, nil
		default:
			return false, fmt.Errorf("got status %v but want terminal", state.ClientStatus)
		}

	}, func(err error) {
		require.NoError(t, err)
	})

	state := ar.AllocState()
	require.Equal(t, structs.AllocClientStatusFailed, state.ClientStatus)
	require.Equal(t, structs.TaskStateDead, state.TaskStates["web"].State)
	require.True(t, state.TaskStates["web"].Successful())
	require.Equal(t, structs.TaskStateDead, state.TaskStates["bad"].State)
	require.True(t, state.TaskStates["bad"].Failed)
}

// Test that alloc runner kills tasks in task group when another task fails
func TestAllocRunner_TaskFailed_KillTG(t *testing.T) {
	alloc := mock.Alloc()
	tr := alloc.AllocatedResources.Tasks[alloc.Job.TaskGroups[0].Tasks[0].Name]
	alloc.Job.TaskGroups[0].RestartPolicy.Attempts = 0

	// Create two tasks in the task group
	task := alloc.Job.TaskGroups[0].Tasks[0]
	task.Name = "task1"
	task.Driver = "mock_driver"
	task.KillTimeout = 10 * time.Millisecond
	task.Config = map[string]interface{}{
		"run_for": "10s",
	}
	// Set a service with check
	task.Services = []*structs.Service{
		{
			Name:      "fakservice",
			PortLabel: "http",
			Checks: []*structs.ServiceCheck{
				{
					Name:     "fakecheck",
					Type:     structs.ServiceCheckScript,
					Command:  "true",
					Interval: 30 * time.Second,
					Timeout:  5 * time.Second,
				},
			},
		},
	}

	task2 := alloc.Job.TaskGroups[0].Tasks[0].Copy()
	task2.Name = "task 2"
	task2.Driver = "mock_driver"
	task2.Config = map[string]interface{}{
		"start_error": "fail task please",
	}
	alloc.Job.TaskGroups[0].Tasks = append(alloc.Job.TaskGroups[0].Tasks, task2)
	alloc.AllocatedResources.Tasks[task.Name] = tr
	alloc.AllocatedResources.Tasks[task2.Name] = tr

	// Make the alloc be part of a deployment
	alloc.DeploymentID = uuid.Generate()
	alloc.Job.TaskGroups[0].Update = structs.DefaultUpdateStrategy.Copy()
	alloc.Job.TaskGroups[0].Update.HealthCheck = structs.UpdateStrategyHealthCheck_Checks
	alloc.Job.TaskGroups[0].Update.MaxParallel = 1
	alloc.Job.TaskGroups[0].Update.MinHealthyTime = 10 * time.Millisecond
	alloc.Job.TaskGroups[0].Update.HealthyDeadline = 2 * time.Second

	checkHealthy := &api.AgentCheck{
		CheckID: uuid.Generate(),
		Status:  api.HealthPassing,
	}

	conf, cleanup := testAllocRunnerConfig(t, alloc)
	defer cleanup()

	consulClient := conf.Consul.(*cconsul.MockConsulServiceClient)
	consulClient.AllocRegistrationsFn = func(allocID string) (*consul.AllocRegistration, error) {
		return &consul.AllocRegistration{
			Tasks: map[string]*consul.ServiceRegistrations{
				task.Name: {
					Services: map[string]*consul.ServiceRegistration{
						"123": {
							Service: &api.AgentService{Service: "fakeservice"},
							Checks:  []*api.AgentCheck{checkHealthy},
						},
					},
				},
			},
		}, nil
	}

	ar, err := NewAllocRunner(conf)
	require.NoError(t, err)
	defer destroy(ar)
	go ar.Run()
	upd := conf.StateUpdater.(*MockStateUpdater)

	testutil.WaitForResult(func() (bool, error) {
		last := upd.Last()
		if last == nil {
			return false, fmt.Errorf("No updates")
		}
		if last.ClientStatus != structs.AllocClientStatusFailed {
			return false, fmt.Errorf("got status %v; want %v", last.ClientStatus, structs.AllocClientStatusFailed)
		}

		// Task One should be killed
		state1 := last.TaskStates[task.Name]
		if state1.State != structs.TaskStateDead {
			return false, fmt.Errorf("got state %v; want %v", state1.State, structs.TaskStateDead)
		}
		if len(state1.Events) < 2 {
			// At least have a received and destroyed
			return false, fmt.Errorf("Unexpected number of events")
		}

		found := false
		for _, e := range state1.Events {
			if e.Type != structs.TaskSiblingFailed {
				found = true
			}
		}

		if !found {
			return false, fmt.Errorf("Did not find event %v", structs.TaskSiblingFailed)
		}

		// Task Two should be failed
		state2 := last.TaskStates[task2.Name]
		if state2.State != structs.TaskStateDead {
			return false, fmt.Errorf("got state %v; want %v", state2.State, structs.TaskStateDead)
		}
		if !state2.Failed {
			return false, fmt.Errorf("task2 should have failed")
		}

		if !last.DeploymentStatus.HasHealth() {
			return false, fmt.Errorf("Expected deployment health to be non nil")
		}

		return true, nil
	}, func(err error) {
		require.Fail(t, "err: %v", err)
	})
}

// Test that alloc becoming terminal should destroy the alloc runner
func TestAllocRunner_TerminalUpdate_Destroy(t *testing.T) {
	t.Parallel()
	alloc := mock.BatchAlloc()
	tr := alloc.AllocatedResources.Tasks[alloc.Job.TaskGroups[0].Tasks[0].Name]
	alloc.Job.TaskGroups[0].RestartPolicy.Attempts = 0
	// Ensure task takes some time
	task := alloc.Job.TaskGroups[0].Tasks[0]
	task.Driver = "mock_driver"
	task.Config["run_for"] = "10s"
	alloc.AllocatedResources.Tasks[task.Name] = tr

	conf, cleanup := testAllocRunnerConfig(t, alloc)
	defer cleanup()
	ar, err := NewAllocRunner(conf)
	require.NoError(t, err)
	defer destroy(ar)
	go ar.Run()
	upd := conf.StateUpdater.(*MockStateUpdater)

	testutil.WaitForResult(func() (bool, error) {
		last := upd.Last()
		if last == nil {
			return false, fmt.Errorf("No updates")
		}
		if last.ClientStatus != structs.AllocClientStatusRunning {
			return false, fmt.Errorf("got status %v; want %v", last.ClientStatus, structs.AllocClientStatusRunning)
		}
		return true, nil
	}, func(err error) {
		require.Fail(t, "err: %v", err)
	})

	// Update the alloc to be terminal which should cause the alloc runner to
	// stop the tasks and wait for a destroy.
	update := ar.alloc.Copy()
	update.DesiredStatus = structs.AllocDesiredStatusStop
	ar.Update(update)

	testutil.WaitForResult(func() (bool, error) {
		last := upd.Last()
		if last == nil {
			return false, fmt.Errorf("No updates")
		}

		// Check the status has changed.
		if last.ClientStatus != structs.AllocClientStatusComplete {
			return false, fmt.Errorf("got client status %v; want %v", last.ClientStatus, structs.AllocClientStatusComplete)
		}

		// Check the alloc directory still exists
		if _, err := os.Stat(ar.allocDir.AllocDir); err != nil {
			return false, fmt.Errorf("alloc dir destroyed: %v", ar.allocDir.AllocDir)
		}

		return true, nil
	}, func(err error) {
		require.Fail(t, "err: %v", err)
	})

	// Send the destroy signal and ensure the AllocRunner cleans up.
	ar.Destroy()

	testutil.WaitForResult(func() (bool, error) {
		last := upd.Last()
		if last == nil {
			return false, fmt.Errorf("No updates")
		}

		// Check the status has changed.
		if last.ClientStatus != structs.AllocClientStatusComplete {
			return false, fmt.Errorf("got client status %v; want %v", last.ClientStatus, structs.AllocClientStatusComplete)
		}

		// Check the alloc directory was cleaned
		if _, err := os.Stat(ar.allocDir.AllocDir); err == nil {
			return false, fmt.Errorf("alloc dir still exists: %v", ar.allocDir.AllocDir)
		} else if !os.IsNotExist(err) {
			return false, fmt.Errorf("stat err: %v", err)
		}

		return true, nil
	}, func(err error) {
		require.Fail(t, "err: %v", err)
	})
}

// TestAllocRunner_PersistState_Destroyed asserts that destroyed allocs don't persist anymore
func TestAllocRunner_PersistState_Destroyed(t *testing.T) {
	t.Parallel()

	alloc := mock.BatchAlloc()
	taskName := alloc.Job.LookupTaskGroup(alloc.TaskGroup).Tasks[0].Name

	conf, cleanup := testAllocRunnerConfig(t, alloc)
	conf.StateDB = state.NewMemDB(conf.Logger)

	defer cleanup()
	ar, err := NewAllocRunner(conf)
	require.NoError(t, err)
	defer destroy(ar)

	go ar.Run()

	select {
	case <-ar.WaitCh():
	case <-time.After(10 * time.Second):
		require.Fail(t, "timed out waiting for alloc to complete")
	}

	// test final persisted state upon completion
	require.NoError(t, ar.PersistState())
	allocs, _, err := conf.StateDB.GetAllAllocations()
	require.NoError(t, err)
	require.Len(t, allocs, 1)
	require.Equal(t, alloc.ID, allocs[0].ID)
	_, ts, err := conf.StateDB.GetTaskRunnerState(alloc.ID, taskName)
	require.NoError(t, err)
	require.Equal(t, structs.TaskStateDead, ts.State)

	// check that DB alloc is empty after destroying AR
	ar.Destroy()
	select {
	case <-ar.DestroyCh():
	case <-time.After(10 * time.Second):
		require.Fail(t, "timedout waiting for destruction")
	}

	allocs, _, err = conf.StateDB.GetAllAllocations()
	require.NoError(t, err)
	require.Empty(t, allocs)
	_, ts, err = conf.StateDB.GetTaskRunnerState(alloc.ID, taskName)
	require.NoError(t, err)
	require.Nil(t, ts)

	// check that DB alloc is empty after persisting state of destroyed AR
	ar.PersistState()
	allocs, _, err = conf.StateDB.GetAllAllocations()
	require.NoError(t, err)
	require.Empty(t, allocs)
	_, ts, err = conf.StateDB.GetTaskRunnerState(alloc.ID, taskName)
	require.NoError(t, err)
	require.Nil(t, ts)
}