feat(task): Add task middleware's for checks and notifications

To have checks and notifications happen transactionally we need to be
able to alert the task system when a new task was created using the checks and notifications systems.
These two new middlewares allow us to inform the task system of a update
to a task that was created through the check or notification systems.

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## v2.0.0-alpha.17 [unreleased]
 
 ### Features
+1. [14809](https://github.com/influxdata/influxdb/pull/14809): Add task middleware's for checks and notifications
 1. [14495](https://github.com/influxdata/influxdb/pull/14495): optional gzip compression of the query CSV response.
 1. [14567](https://github.com/influxdata/influxdb/pull/14567): Add task types.
 1. [14604](https://github.com/influxdata/influxdb/pull/14604): When getting task runs from the API, runs will be returned in order of most recently scheduled first.

cmd/influxd/launcher/launcher.go

@@ -459,9 +459,7 @@ func (m *Launcher) run(ctx context.Context) (err error) {
 		labelSvc                platform.LabelService                    = m.kvService
 		secretSvc               platform.SecretService                   = m.kvService
 		lookupSvc               platform.LookupService                   = m.kvService
-		notificationRuleSvc     platform.NotificationRuleStore           = m.kvService
 		notificationEndpointSvc platform.NotificationEndpointService     = m.kvService
-		checkSvc                platform.CheckService                    = m.kvService
 	)
 
 	switch m.secretStore {
@@ -565,6 +563,18 @@ func (m *Launcher) run(ctx context.Context) (err error) {
 		m.taskControlService = combinedTaskService
 	}
 
+	var checkSvc platform.CheckService
+	{
+		coordinator := coordinator.New(m.logger, m.scheduler)
+		checkSvc = middleware.NewCheckService(m.kvService, m.kvService, coordinator)
+	}
+
+	var notificationRuleSvc platform.NotificationRuleStore
+	{
+		coordinator := coordinator.New(m.logger, m.scheduler)
+		notificationRuleSvc = middleware.NewNotificationRuleStore(m.kvService, m.kvService, coordinator)
+	}
+
 	// NATS streaming server
 	m.natsServer = nats.NewServer()
 	if err := m.natsServer.Open(); err != nil {

task/backend/middleware/check_middleware.go

@@ -0,0 +1,120 @@
+package middleware
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/influxdata/influxdb"
+)
+
+// CoordinatingCheckService acts as a CheckService decorator that handles coordinating the api request
+// with the required task control actions asynchronously via a message dispatcher
+type CoordinatingCheckService struct {
+	influxdb.CheckService
+	coordinator Coordinator
+	taskService influxdb.TaskService
+}
+
+// NewCheckService constructs a new coordinating check service
+func NewCheckService(cs influxdb.CheckService, ts influxdb.TaskService, coordinator Coordinator) *CoordinatingCheckService {
+	c := &CoordinatingCheckService{
+		CheckService: cs,
+		taskService:  ts,
+		coordinator:  coordinator,
+	}
+
+	return c
+}
+
+// CreateCheck Creates a check and Publishes the change it can be scheduled.
+func (cs *CoordinatingCheckService) CreateCheck(ctx context.Context, c influxdb.Check, userID influxdb.ID) error {
+
+	if err := cs.CheckService.CreateCheck(ctx, c, userID); err != nil {
+		return err
+	}
+
+	t, err := cs.taskService.FindTaskByID(ctx, c.GetTaskID())
+	if err != nil {
+		return err
+	}
+
+	if err := cs.coordinator.TaskCreated(ctx, t); err != nil {
+		if derr := cs.CheckService.DeleteCheck(ctx, c.GetID()); derr != nil {
+			return fmt.Errorf("schedule task failed: %s\n\tcleanup also failed: %s", err, derr)
+		}
+
+		return err
+	}
+
+	return nil
+}
+
+// UpdateCheck Updates a check and publishes the change so the task owner can act on the update
+func (cs *CoordinatingCheckService) UpdateCheck(ctx context.Context, id influxdb.ID, c influxdb.Check) (influxdb.Check, error) {
+	from, err := cs.CheckService.FindCheckByID(ctx, id)
+	if err != nil {
+		return nil, err
+	}
+
+	fromTask, err := cs.taskService.FindTaskByID(ctx, from.GetTaskID())
+	if err != nil {
+		return nil, err
+	}
+
+	to, err := cs.CheckService.UpdateCheck(ctx, id, c)
+	if err != nil {
+		return to, err
+	}
+
+	toTask, err := cs.taskService.FindTaskByID(ctx, to.GetTaskID())
+	if err != nil {
+		return nil, err
+	}
+
+	return to, cs.coordinator.TaskUpdated(ctx, fromTask, toTask)
+}
+
+// PatchCheck Updates a check and publishes the change so the task owner can act on the update
+func (cs *CoordinatingCheckService) PatchCheck(ctx context.Context, id influxdb.ID, upd influxdb.CheckUpdate) (influxdb.Check, error) {
+	from, err := cs.CheckService.FindCheckByID(ctx, id)
+	if err != nil {
+		return nil, err
+	}
+
+	fromTask, err := cs.taskService.FindTaskByID(ctx, from.GetTaskID())
+	if err != nil {
+		return nil, err
+	}
+
+	to, err := cs.CheckService.PatchCheck(ctx, id, upd)
+	if err != nil {
+		return to, err
+	}
+
+	toTask, err := cs.taskService.FindTaskByID(ctx, to.GetTaskID())
+	if err != nil {
+		return nil, err
+	}
+
+	return to, cs.coordinator.TaskUpdated(ctx, fromTask, toTask)
+
+}
+
+// DeleteCheck delete the check and publishes the change, to allow the task owner to find out about this change faster.
+func (cs *CoordinatingCheckService) DeleteCheck(ctx context.Context, id influxdb.ID) error {
+	check, err := cs.CheckService.FindCheckByID(ctx, id)
+	if err != nil {
+		return err
+	}
+
+	t, err := cs.taskService.FindTaskByID(ctx, check.GetTaskID())
+	if err != nil {
+		return err
+	}
+
+	if err := cs.coordinator.TaskDeleted(ctx, t.ID); err != nil {
+		return err
+	}
+
+	return cs.CheckService.DeleteCheck(ctx, id)
+}

task/backend/middleware/check_middleware_test.go

@@ -0,0 +1,234 @@
+package middleware_test
+
+import (
+	"context"
+	"fmt"
+	"testing"
+
+	"github.com/influxdata/influxdb"
+	"github.com/influxdata/influxdb/mock"
+	"github.com/influxdata/influxdb/notification/check"
+	"github.com/influxdata/influxdb/notification/rule"
+	"github.com/influxdata/influxdb/task/backend/middleware"
+)
+
+type pipingCoordinator struct {
+	err             error
+	taskCreatedPipe chan *influxdb.Task
+	taskUpdatedPipe chan *influxdb.Task
+	taskDeletedPipe chan influxdb.ID
+}
+
+func (p *pipingCoordinator) taskCreatedChan() <-chan *influxdb.Task {
+	if p.taskCreatedPipe == nil {
+		p.taskCreatedPipe = make(chan *influxdb.Task, 1)
+	}
+	return p.taskCreatedPipe
+}
+func (p *pipingCoordinator) taskUpdatedChan() <-chan *influxdb.Task {
+	if p.taskUpdatedPipe == nil {
+		p.taskUpdatedPipe = make(chan *influxdb.Task, 1)
+	}
+	return p.taskUpdatedPipe
+}
+func (p *pipingCoordinator) taskDeletedChan() <-chan influxdb.ID {
+	if p.taskDeletedPipe == nil {
+		p.taskDeletedPipe = make(chan influxdb.ID, 1)
+	}
+	return p.taskDeletedPipe
+}
+
+func (p *pipingCoordinator) TaskCreated(_ context.Context, t *influxdb.Task) error {
+	if p.taskCreatedPipe != nil {
+		p.taskCreatedPipe <- t
+	}
+	return p.err
+}
+func (p *pipingCoordinator) TaskUpdated(_ context.Context, from, to *influxdb.Task) error {
+	if p.taskUpdatedPipe != nil {
+		p.taskUpdatedPipe <- to
+	}
+	return p.err
+}
+func (p *pipingCoordinator) TaskDeleted(_ context.Context, id influxdb.ID) error {
+	if p.taskDeletedPipe != nil {
+		p.taskDeletedPipe <- id
+	}
+	return p.err
+}
+func (p *pipingCoordinator) RunCancelled(ctx context.Context, taskID, runID influxdb.ID) error {
+	return p.err
+}
+func (p *pipingCoordinator) RunRetried(ctx context.Context, task *influxdb.Task, run *influxdb.Run) error {
+	return p.err
+}
+func (p *pipingCoordinator) RunForced(ctx context.Context, task *influxdb.Task, run *influxdb.Run) error {
+	return p.err
+}
+
+type mockedSvc struct {
+	taskSvc           *mock.TaskService
+	checkSvc          *mock.CheckService
+	notificationSvc   *mock.NotificationRuleStore
+	pipingCoordinator *pipingCoordinator
+}
+
+func newMockServices() mockedSvc {
+	return mockedSvc{
+		taskSvc: &mock.TaskService{
+			FindTaskByIDFn: func(_ context.Context, id influxdb.ID) (*influxdb.Task, error) { return &influxdb.Task{ID: id}, nil },
+			CreateTaskFn:   func(context.Context, influxdb.TaskCreate) (*influxdb.Task, error) { return &influxdb.Task{ID: 1}, nil },
+			UpdateTaskFn: func(_ context.Context, id influxdb.ID, _ influxdb.TaskUpdate) (*influxdb.Task, error) {
+				return &influxdb.Task{ID: id}, nil
+			},
+			DeleteTaskFn: func(context.Context, influxdb.ID) error { return nil },
+		},
+		checkSvc: &mock.CheckService{
+			FindCheckByIDFn: func(_ context.Context, id influxdb.ID) (influxdb.Check, error) {
+				c := &check.Deadman{}
+				c.SetID(id)
+				return c, nil
+			},
+			CreateCheckFn: func(context.Context, influxdb.Check, influxdb.ID) error { return nil },
+			UpdateCheckFn: func(_ context.Context, _ influxdb.ID, c influxdb.Check) (influxdb.Check, error) { return c, nil },
+			PatchCheckFn: func(_ context.Context, id influxdb.ID, _ influxdb.CheckUpdate) (influxdb.Check, error) {
+				c := &check.Deadman{}
+				c.SetID(id)
+				return c, nil
+			},
+			DeleteCheckFn: func(context.Context, influxdb.ID) error { return nil },
+		},
+		notificationSvc: &mock.NotificationRuleStore{
+			FindNotificationRuleByIDF: func(_ context.Context, id influxdb.ID) (influxdb.NotificationRule, error) {
+				c := &rule.HTTP{}
+				c.SetID(id)
+				return c, nil
+			},
+			CreateNotificationRuleF: func(context.Context, influxdb.NotificationRule, influxdb.ID) error { return nil },
+			UpdateNotificationRuleF: func(_ context.Context, _ influxdb.ID, c influxdb.NotificationRule, _ influxdb.ID) (influxdb.NotificationRule, error) {
+				return c, nil
+			},
+			PatchNotificationRuleF: func(_ context.Context, id influxdb.ID, _ influxdb.NotificationRuleUpdate) (influxdb.NotificationRule, error) {
+				c := &rule.HTTP{}
+				c.SetID(id)
+				return c, nil
+			},
+			DeleteNotificationRuleF: func(context.Context, influxdb.ID) error { return nil },
+		},
+		pipingCoordinator: &pipingCoordinator{},
+	}
+}
+
+func newCheckSvcStack() (mockedSvc, *middleware.CoordinatingCheckService) {
+	msvcs := newMockServices()
+	return msvcs, middleware.NewCheckService(msvcs.checkSvc, msvcs.taskSvc, msvcs.pipingCoordinator)
+}
+
+func TestCheckCreate(t *testing.T) {
+	mocks, checkService := newCheckSvcStack()
+	ch := mocks.pipingCoordinator.taskCreatedChan()
+
+	check := &check.Deadman{}
+	check.SetTaskID(4)
+
+	err := checkService.CreateCheck(context.Background(), check, 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	select {
+	case task := <-ch:
+		if task.ID != check.GetTaskID() {
+			t.Fatalf("task sent to coordinator doesn't match expected")
+		}
+	default:
+		t.Fatal("didn't receive task")
+	}
+
+	mocks.pipingCoordinator.err = fmt.Errorf("bad")
+	mocks.checkSvc.DeleteCheckFn = func(context.Context, influxdb.ID) error { return fmt.Errorf("AARGH") }
+
+	err = checkService.CreateCheck(context.Background(), check, 1)
+	if err.Error() != "schedule task failed: bad\n\tcleanup also failed: AARGH" {
+		t.Fatal(err)
+	}
+}
+
+func TestCheckUpdate(t *testing.T) {
+	mocks, checkService := newCheckSvcStack()
+	ch := mocks.pipingCoordinator.taskUpdatedChan()
+
+	mocks.checkSvc.UpdateCheckFn = func(_ context.Context, _ influxdb.ID, c influxdb.Check) (influxdb.Check, error) {
+		c.SetTaskID(10)
+		return c, nil
+	}
+
+	deadman := &check.Deadman{}
+	deadman.SetTaskID(4)
+
+	check, err := checkService.UpdateCheck(context.Background(), 1, deadman)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	select {
+	case task := <-ch:
+		if task.ID != check.GetTaskID() {
+			t.Fatalf("task sent to coordinator doesn't match expected")
+		}
+	default:
+		t.Fatal("didn't receive task")
+	}
+}
+
+func TestCheckPatch(t *testing.T) {
+	mocks, checkService := newCheckSvcStack()
+	ch := mocks.pipingCoordinator.taskUpdatedChan()
+
+	deadman := &check.Deadman{}
+	deadman.SetTaskID(4)
+
+	mocks.checkSvc.PatchCheckFn = func(context.Context, influxdb.ID, influxdb.CheckUpdate) (influxdb.Check, error) {
+		return deadman, nil
+	}
+
+	check, err := checkService.PatchCheck(context.Background(), 1, influxdb.CheckUpdate{})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	select {
+	case task := <-ch:
+		if task.ID != check.GetTaskID() {
+			t.Fatalf("task sent to coordinator doesn't match expected")
+		}
+	default:
+		t.Fatal("didn't receive task")
+	}
+}
+
+func TestCheckDelete(t *testing.T) {
+	mocks, checkService := newCheckSvcStack()
+	ch := mocks.pipingCoordinator.taskDeletedChan()
+
+	mocks.checkSvc.FindCheckByIDFn = func(_ context.Context, id influxdb.ID) (influxdb.Check, error) {
+		c := &check.Deadman{}
+		c.SetID(id)
+		c.SetTaskID(21)
+		return c, nil
+	}
+
+	err := checkService.DeleteCheck(context.Background(), 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	select {
+	case id := <-ch:
+		if id != influxdb.ID(21) {
+			t.Fatalf("task sent to coordinator doesn't match expected")
+		}
+	default:
+		t.Fatal("didn't receive task")
+	}
+}