/
binds.go
126 lines (106 loc) · 3.18 KB
/
binds.go
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// This file is part of the Smart Home
// Program complex distribution https://github.com/e154/smart-home
// Copyright (C) 2016-2021, 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 modbus_rtu
import (
"encoding/json"
"fmt"
"strings"
"time"
"github.com/pkg/errors"
"github.com/e154/smart-home/common"
"github.com/e154/smart-home/plugins/node"
"github.com/e154/smart-home/system/event_bus"
"go.uber.org/atomic"
)
type modbusRtu func(f string, address, count uint16, command []uint16) (result ModBusResponse)
// NewModbusRtu ...
func NewModbusRtu(eventBus event_bus.EventBus, actor *Actor) (modbus modbusRtu) {
var isStarted = atomic.NewBool(false)
return func(f string, address, count uint16, command []uint16) (result ModBusResponse) {
//fmt.Printf("send message^ func(%s), address(%d), count(%d), command(%b) \n", f, address, count, command)
var err error
defer func() {
if err != nil {
result.Error = err.Error()
}
}()
if isStarted.Load() {
err = fmt.Errorf("in process")
return
}
isStarted.Store(true)
defer isStarted.Store(false)
// time metric
startTime := time.Now()
// set callback func
ch := make(chan node.MessageResponse)
defer close(ch)
fn := func(topic string, msg node.MessageResponse) {
items := strings.Split(topic, "/")
entityId := items[len(items)-1]
if entityId != actor.Id.String() {
return
}
ch <- msg
}
var topic = actor.localTopic(fmt.Sprintf("resp/%s", actor.Id))
if err = eventBus.Subscribe(topic, fn, false); err != nil {
log.Error(err.Error())
return
}
defer func() {
eventBus.Unsubscribe(topic, fn)
}()
var properties []byte
if properties, err = json.Marshal(actor.Settings().Serialize()); err != nil {
log.Error(err.Error())
return
}
cmd := ModBusCommand{
Function: f,
Address: address,
Count: count,
Command: command,
}
var requestCommand []byte
if requestCommand, err = json.Marshal(cmd); err != nil {
log.Error(err.Error())
return
}
msg := node.MessageRequest{
EntityId: actor.Id,
DeviceType: DeviceTypeModbusRtu,
Properties: properties,
Command: requestCommand,
}
eventBus.Publish(actor.localTopic(fmt.Sprintf("req/%s", actor.Id)), msg)
// wait response
ticker := time.NewTimer(time.Second * 1)
defer ticker.Stop()
select {
case <-ticker.C:
err = errors.Wrap(common.ErrTimeout, "wait timeout")
case resp := <-ch:
if err = json.Unmarshal(resp.Response, &result); err != nil {
log.Error(err.Error())
}
}
result.Time = time.Since(startTime).Seconds()
return
}
}