Support NATS cluster

cmd/fermentord/loop.go

@@ -34,7 +34,7 @@ func mainLoop(ctx context.Context, wg *sync.WaitGroup, js nats.JetStream, config
 	defer display.Close()
 
 	// Controller
-	ctrl := controllers.NewChamberController("Chamber 1", *config)
+	ctrl := controllers.NewChamberController(*config)
 
 	// Configuration reload
 	loadConfiguration := func() {

cmd/fermentord/main.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"log"
 	"net/http"
+	"strings"
 	"sync"
 	"time"
 
@@ -31,7 +32,9 @@ func main() {
 	config := configuration.LoadConfiguration()
 
 	// NATS
-	nc, err := nats.Connect(config.NATS.URL)
+	servers := strings.Join(config.NATS.Servers, ",")
+	userInfo := nats.UserInfo(config.NATS.Username, config.NATS.Password)
+	nc, err := nats.Connect(servers, userInfo)
 	if err != nil {
 		log.Fatal(err)
 	}

internal/configuration/config.go

@@ -10,9 +10,11 @@ import (
 
 type Configuration struct {
 	NATS struct {
-		URL     string `mapstructure:"url"`
-		Stream  string `mapstructure:"stream"`
-		Subject struct {
+		Servers  []string `mapstructure:"servers"`
+		Username string   `mapstructure:"username"`
+		Password string   `mapstructure:"password"`
+		Stream   string   `mapstructure:"stream"`
+		Subject  struct {
 			Event string `mapstructure:"event"`
 			State string `mapstructure:"state"`
 			Temp  string `mapstructure:"temp"`

internal/controllers/chamber.go

@@ -36,8 +36,6 @@ type ChamberController struct {
 	C                      chan ChamberState
 	isPaused               bool
 
-	name string
-
 	// Current temperature readings.
 	ambientTemperature float64
 	chamberTemperature float64
@@ -50,10 +48,9 @@ type ChamberController struct {
 	hub *sentry.Hub
 }
 
-func NewChamberController(name string, config configuration.Configuration) *ChamberController {
+func NewChamberController(config configuration.Configuration) *ChamberController {
 	return &ChamberController{
 		C:             make(chan ChamberState),
-		name:          name,
 		config:        config,
 		pid:           NewPIDController(config.PID.Kp, config.PID.Ki, config.PID.Kd),
 		chTemp:        make(chan temperature.TemperatureReading),