feat(schedules): add the schedule API

* feat(jobs): add job service interface

* feat(jobs): create job execution api

* style(jobs): remove comment

* feat(jobs): add bindings

* feat(jobs): validate payload different cases

* refactor(jobs): rename endpointJob method

* refactor(jobs): return original error

* feat(jobs): pull image before creating container

* feat(jobs): run jobs with sh

* style(jobs): remove comment

* refactor(jobs): change error names

* feat(jobs): sync pull image

* fix(jobs): close image reader after error check

* style(jobs): remove comment and add docs

* refactor(jobs): inline script command

* fix(jobs): handle pul image error

* refactor(jobs): handle image pull output

* fix(docker): set http client timeout to 100s

* feat(api): create schedule type

* feat(agent): add basic schedule api

* feat(schedules): add schedule service in bolt

* feat(schedule): add schedule service to handler

* feat(schedule): add and list schedules from db

* feat(agent): get schedule from db

* feat(schedule): update schedule in db

* feat(agent): delete schedule

* fix(bolt): remove sync method from scheduleService

* feat(schedules): save/delete script in fs

* feat(schedules): schedules cron service implementation

* feat(schedule): integrate handler with cron

* feat(schedules): schedules API overhaul

* refactor(project): remove .idea folder

* fix(schedules): fix script task execute call

* refactor(schedules): refactor/fix golint issues

* refactor(schedules): update SnapshotTask documentation

* refactor(schedules): validate image name in ScheduleCreate operation

api/bolt/schedule/schedule.go

@@ -0,0 +1,103 @@
+package schedule
+
+import (
+	"github.com/portainer/portainer"
+	"github.com/portainer/portainer/bolt/internal"
+
+	"github.com/boltdb/bolt"
+)
+
+const (
+	// BucketName represents the name of the bucket where this service stores data.
+	BucketName = "schedules"
+)
+
+// Service represents a service for managing schedule data.
+type Service struct {
+	db *bolt.DB
+}
+
+// NewService creates a new instance of a service.
+func NewService(db *bolt.DB) (*Service, error) {
+	err := internal.CreateBucket(db, BucketName)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Service{
+		db: db,
+	}, nil
+}
+
+// Schedule returns a schedule by ID.
+func (service *Service) Schedule(ID portainer.ScheduleID) (*portainer.Schedule, error) {
+	var schedule portainer.Schedule
+	identifier := internal.Itob(int(ID))
+
+	err := internal.GetObject(service.db, BucketName, identifier, &schedule)
+	if err != nil {
+		return nil, err
+	}
+
+	return &schedule, nil
+}
+
+// UpdateSchedule updates a schedule.
+func (service *Service) UpdateSchedule(ID portainer.ScheduleID, schedule *portainer.Schedule) error {
+	identifier := internal.Itob(int(ID))
+	return internal.UpdateObject(service.db, BucketName, identifier, schedule)
+}
+
+// DeleteSchedule deletes a schedule.
+func (service *Service) DeleteSchedule(ID portainer.ScheduleID) error {
+	identifier := internal.Itob(int(ID))
+	return internal.DeleteObject(service.db, BucketName, identifier)
+}
+
+// Schedules return a array containing all the schedules.
+func (service *Service) Schedules() ([]portainer.Schedule, error) {
+	var schedules = make([]portainer.Schedule, 0)
+
+	err := service.db.View(func(tx *bolt.Tx) error {
+		bucket := tx.Bucket([]byte(BucketName))
+
+		cursor := bucket.Cursor()
+		for k, v := cursor.First(); k != nil; k, v = cursor.Next() {
+			var schedule portainer.Schedule
+			err := internal.UnmarshalObject(v, &schedule)
+			if err != nil {
+				return err
+			}
+			schedules = append(schedules, schedule)
+		}
+
+		return nil
+	})
+
+	return schedules, err
+}
+
+// CreateSchedule assign an ID to a new schedule and saves it.
+func (service *Service) CreateSchedule(schedule *portainer.Schedule) error {
+	return service.db.Update(func(tx *bolt.Tx) error {
+		bucket := tx.Bucket([]byte(BucketName))
+
+		// We manually manage sequences for schedules
+		err := bucket.SetSequence(uint64(schedule.ID))
+		if err != nil {
+			return err
+		}
+
+		data, err := internal.MarshalObject(schedule)
+		if err != nil {
+			return err
+		}
+
+		return bucket.Put(internal.Itob(int(schedule.ID)), data)
+	})
+}
+
+// GetNextIdentifier returns the next identifier for a schedule.
+func (service *Service) GetNextIdentifier() int {
+	return internal.GetNextIdentifier(service.db, BucketName)
+}