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system_trigger.go
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system_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 (
"github.com/e154/smart-home/common/events"
"go.uber.org/atomic"
"sync"
"github.com/e154/smart-home/system/bus"
)
const (
// TopicSystem ...
TopicSystem = "system/#"
// SystemName ...
SystemName = "system"
// SystemFunctionName ...
SystemFunctionName = "automationTriggerSystem"
)
var _ ITrigger = (*SystemTrigger)(nil)
// SystemTrigger ...
type SystemTrigger struct {
baseTrigger
counter *atomic.Int32
}
// NewSystemTrigger ...
func NewSystemTrigger(eventBus bus.Bus) ITrigger {
return &SystemTrigger{
baseTrigger: baseTrigger{
eventBus: eventBus,
msgQueue: bus.NewBus(),
functionName: SystemFunctionName,
name: SystemName,
},
counter: atomic.NewInt32(0),
}
}
// AsyncAttach ...
func (t *SystemTrigger) AsyncAttach(wg *sync.WaitGroup) {
if err := t.eventBus.Subscribe(TopicSystem, t.eventHandler); err != nil {
log.Error(err.Error())
}
wg.Done()
}
func (t *SystemTrigger) eventHandler(topic string, event interface{}) {
if t.counter.Load() <= 0 {
return
}
switch event.(type) {
case events.EventStateChanged:
return
}
t.msgQueue.Publish(topic, &SystemTriggerMessage{
Topic: topic,
EventName: events.EventName(event),
Event: event,
})
}
// Subscribe ...
func (t *SystemTrigger) Subscribe(options Subscriber) error {
//log.Infof("subscribe topic %s", TopicSystem)
t.counter.Inc()
return t.msgQueue.Subscribe(TopicSystem, options.Handler)
}
// Unsubscribe ...
func (t *SystemTrigger) Unsubscribe(options Subscriber) error {
//log.Infof("unsubscribe topic %s", TopicSystem)
t.counter.Dec()
return t.msgQueue.Unsubscribe(TopicSystem, options.Handler)
}