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time_trigger.go
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time_trigger.go
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// This file is part of the Smart Home
// Program complex distribution https://github.com/e154/smart-home
// Copyright (C) 2016-2023, Filippov Alex
//
// This library is free software: you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 3 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library. If not, see
// <https://www.gnu.org/licenses/>.
package triggers
import (
"fmt"
"reflect"
"sync"
"time"
"github.com/e154/smart-home/system/bus"
"github.com/e154/smart-home/system/scheduler"
)
const (
// TimeName ...
TimeName = "time"
// TimeFunctionName ...
TimeFunctionName = "automationTriggerTime"
// TimeQueueSize ...
TimeQueueSize = 10
)
var _ ITrigger = (*TimeTrigger)(nil)
type subscribe struct {
callback reflect.Value
entryID scheduler.EntryID
}
// TimeTrigger ...
type TimeTrigger struct {
baseTrigger
scheduler *scheduler.Scheduler
sync.Mutex
subscribers map[string][]*subscribe
}
// NewTimeTrigger ...
func NewTimeTrigger(eventBus bus.Bus,
scheduler *scheduler.Scheduler) ITrigger {
return &TimeTrigger{
scheduler: scheduler,
subscribers: make(map[string][]*subscribe),
baseTrigger: baseTrigger{
eventBus: eventBus,
msgQueue: bus.NewBus(),
functionName: TimeFunctionName,
name: TimeName,
},
}
}
// AsyncAttach ...
func (t *TimeTrigger) AsyncAttach(wg *sync.WaitGroup) {
wg.Done()
}
// Subscribe ...
func (t *TimeTrigger) Subscribe(options Subscriber) error {
if options.Payload == nil {
return fmt.Errorf("payload is nil")
}
if _, ok := options.Payload[CronOptionTrigger]; !ok {
return fmt.Errorf("cron attribute is nil")
}
schedule := options.Payload[CronOptionTrigger].String()
if schedule == "" {
return fmt.Errorf("error static cast to string %v", options.Payload)
}
callback := reflect.ValueOf(options.Handler)
entryID, err := t.scheduler.AddFunc(schedule, func() {
callback.Call([]reflect.Value{reflect.ValueOf(""), reflect.ValueOf(time.Now())})
})
if err != nil {
return err
}
sub := &subscribe{
callback: callback,
entryID: entryID,
}
t.Lock()
t.subscribers[schedule] = append(t.subscribers[schedule], sub)
t.Unlock()
return nil
}
// Unsubscribe ...
func (t *TimeTrigger) Unsubscribe(options Subscriber) error {
if options.Payload == nil {
return fmt.Errorf("payload is nil")
}
schedule := options.Payload[CronOptionTrigger].String()
if schedule == "" {
return fmt.Errorf("error static cast to string %v", options.Payload)
}
rv := reflect.ValueOf(options.Handler)
t.Lock()
defer t.Unlock()
var indexesToDelete []int
for i, sub := range t.subscribers[schedule] {
if sub.callback == rv || sub.callback.Pointer() == rv.Pointer() {
indexesToDelete = append(indexesToDelete, i)
}
}
for i := len(indexesToDelete) - 1; i >= 0; i-- {
index := indexesToDelete[i]
t.scheduler.Remove(t.subscribers[schedule][index].entryID)
t.subscribers[schedule] = append(t.subscribers[schedule][:index], t.subscribers[schedule][index+1:]...)
}
return nil
}