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main.go
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main.go
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package main
import (
"encoding/json"
"flag"
"fmt"
"log"
"net/http"
"time"
MQTT "github.com/eclipse/paho.mqtt.golang"
"github.com/gorilla/websocket"
)
var upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
}
type outlet struct {
id string
commands chan string
}
func (o outlet) CommandTopic() string {
return "/voltson/" + o.id
}
func (o outlet) AvailableTopic() string {
return o.CommandTopic() + "/available"
}
func (o outlet) StateTopic() string {
return o.CommandTopic() + "/state"
}
var subscribes = make(chan outlet)
var unsubscribes = make(chan outlet)
type message struct {
topic string
contents string
}
type RelayMessage struct {
Uri string `json:"uri"`
Action string `json:"action"`
}
type LoginReplyMessage struct {
Uri string `json:"uri"`
Error int `json:"error"`
Wd int `json:"wd"`
Year int `json:"year"`
Month int `json:"month"`
Day int `json:"day"`
Ms int `json:"ms"`
Hh int `json:"hh"`
Hl int `json:"hl"`
Lh int `json:"lh"`
Ll int `json:"ll"`
}
var messages = make(chan message)
type logWriter struct {
}
func (writer logWriter) Write(bytes []byte) (int, error) {
return fmt.Print(time.Now().UTC().Format("15:04:05.999Z") + " " + string(bytes))
}
func websocketRequest(w http.ResponseWriter, r *http.Request) {
c, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Print("upgrade:", err)
return
}
defer c.Close()
log.Println("Client connected")
mqtt := make(chan string)
offline := make(chan bool)
device := make(chan map[string]interface{})
pendingCommand := false
go func() {
for {
var m map[string]interface{}
c.SetReadDeadline(time.Now().Add(20 * time.Second))
err := c.ReadJSON(&m)
if err != nil {
log.Println("read error:", err)
offline <- true
break
}
pendingCommand = false
device <- m
}
}()
ticker := time.NewTicker(5 * time.Second)
defer ticker.Stop()
o := outlet{"", mqtt}
outer:
for {
select {
case <-offline:
log.Printf("[%s] offline", o.id)
messages <- message{o.AvailableTopic(), "offline"}
unsubscribes <- o
break outer
case <-ticker.C:
log.Printf("[%s] ping", o.id)
if !pendingCommand {
err := c.WriteMessage(websocket.TextMessage, []byte("{\"uri\":\"/ka\"}"))
if err != nil {
log.Println("ping err:", err)
}
}
case m := <-device:
log.Printf("[%s] recv: %s", o.id, m)
if m["id"] != nil {
o.id = string(m["id"].(string))
subscribes <- o
messages <- message{o.AvailableTopic(), "online"}
now := time.Now()
msg, _ := json.Marshal(LoginReplyMessage{
Uri: "/loginReply",
Error: 0,
Wd: 3, // No idea what this is.
Year: now.Year(),
Month: int(now.Month()),
Day: now.Day(),
Ms: (now.Nanosecond() / 1000000),
Hh: 0, // No idea what these mean either
Hl: 0,
Lh: 0,
Ll: 0,
})
log.Printf("[%s] send: %s", o.id, msg)
err = c.WriteMessage(websocket.TextMessage, msg)
if m["relay"] == "open" {
messages <- message{o.StateTopic(), "true"}
} else {
messages <- message{o.StateTopic(), "false"}
}
}
if m["uri"] == "/ka" && m["rssi"] != nil {
now := time.Now()
msg, _ := json.Marshal(LoginReplyMessage{
Uri: "/kr",
Error: 0,
Wd: 3, // No idea what this is.
Year: now.Year(),
Month: int(now.Month()),
Day: now.Day(),
Ms: (now.Nanosecond() / 1000000),
})
log.Printf("[%s] send: %s", o.id, msg)
err = c.WriteMessage(websocket.TextMessage, msg)
}
if m["uri"] == "/runtimeInfo" {
if m["relay"] == "open" {
messages <- message{o.StateTopic(), "true"}
} else {
messages <- message{o.StateTopic(), "false"}
}
}
if m["uri"] == "/state" {
if m["relay"] == "open" {
messages <- message{o.StateTopic(), "true"}
} else {
messages <- message{o.StateTopic(), "false"}
}
}
case command := <-mqtt:
log.Printf("[%s] command: %s", o.id, command)
var err error
var msg []byte
if command == "true" {
msg, _ = json.Marshal(RelayMessage{Uri: "/relay", Action: "open"})
} else {
msg, _ = json.Marshal(RelayMessage{Uri: "/relay", Action: "break"})
}
pendingCommand = true
log.Printf("[%s] send: %s", o.id, msg)
err = c.WriteMessage(websocket.TextMessage, msg)
if err != nil {
log.Println("write error:", err)
break outer
}
default:
time.Sleep(100 * time.Millisecond)
}
}
}
func connectMqtt(mqttPtr *string, mqttUserPtr *string, mqttPasswordPtr *string, unsubscribes chan outlet, subscribes chan outlet, messages chan message) {
subscribedOutlets := map[string]outlet{}
opts := MQTT.NewClientOptions()
opts.SetClientID("voltlet")
opts.AddBroker("tcp://" + *mqttPtr)
opts.SetUsername(*mqttUserPtr)
opts.SetPassword(*mqttPasswordPtr)
opts.SetKeepAlive(2 * time.Second)
opts.SetPingTimeout(1 * time.Second)
opts.SetOnConnectHandler(func(client MQTT.Client) {
log.Print("Connected to mqtt broker")
for _, o := range subscribedOutlets {
mqttSubscribe(client, o)
}
})
opts.SetConnectionLostHandler(func(client MQTT.Client, reason error) {
log.Printf("Connection lost to mqtt broker: %s", reason)
})
c := MQTT.NewClient(opts)
if token := c.Connect(); token.Wait() && token.Error() != nil {
panic(token.Error())
}
for {
select {
case o := <-subscribes:
mqttSubscribe(c, o)
subscribedOutlets[o.CommandTopic()] = o
case o := <-unsubscribes:
mqttUnsubscribe(c, o)
delete(subscribedOutlets, o.CommandTopic())
case m := <-messages:
token := c.Publish(m.topic, 0, true, m.contents)
if token.Wait() && token.Error() != nil {
log.Printf("Error publishing %s on %s", m.contents, m.topic)
}
default:
time.Sleep(100 * time.Millisecond)
}
}
}
func mqttSubscribe(c MQTT.Client, o outlet) {
log.Printf("Subscribing to mqtt topic: %s", o.CommandTopic())
if token := c.Subscribe(o.CommandTopic(), 0, func(client MQTT.Client, msg MQTT.Message) {
o.commands <- string(msg.Payload())
}); token.Wait() && token.Error() != nil {
fmt.Println(token.Error())
}
log.Printf("Subscribed to mqtt topic: %s", o.CommandTopic())
}
func mqttUnsubscribe(c MQTT.Client, o outlet) {
log.Printf("Unsubscribing to mqtt topic: %s", o.CommandTopic())
if token := c.Unsubscribe(o.CommandTopic()); token.Wait() && token.Error() != nil {
fmt.Println(token.Error())
}
log.Printf("Unsubscribed to mqtt topic: %s", o.CommandTopic())
}
func startWebsocket() {
log.Print("Starting websocket")
http.HandleFunc("/gnws", websocketRequest)
log.Fatal(http.ListenAndServe("0.0.0.0:17273", nil))
}
func main() {
log.SetFlags(0)
log.SetOutput(new(logWriter))
mqttPtr := flag.String("mqtt-broker", "localhost:1883", "The host and port of the MQTT broker")
mqttUserPtr := flag.String("mqtt-user", "", "The MQTT broker user")
mqttPasswordPtr := flag.String("mqtt-password", "", "The MQTT broker password")
flag.Parse()
go connectMqtt(mqttPtr, mqttUserPtr, mqttPasswordPtr, unsubscribes, subscribes, messages)
startWebsocket()
}