Update discovery, go mod, and make a simple commandline control

discovery/main.go

@@ -6,13 +6,16 @@ import (
 	"os"
 	"os/user"
 	"path/filepath"
+	"time"
 
 	"github.com/amimof/huego"
 )
 
 // UserInfo is the saved data struture of a Hue app connection
 type UserInfo struct {
-	User string
+	User     string        `json:",omitempty"`
+	LastSync time.Time     `json:",omitempty"`
+	LastIP   *huego.Bridge `json:",omitempty"`
 }
 
 func DiscoverAndConnectFromConfig(appName string) (*huego.Bridge, error) {
@@ -40,14 +43,27 @@ func DiscoverAndConnectFromConfig(appName string) (*huego.Bridge, error) {
 	if !ok {
 		ui = UserInfo{}
 	}
+
+	if ui.LastIP != nil && ui.LastSync.After(time.Now().Add(-(time.Hour * 24 * 30))) {
+		newb := ui.LastIP.Login(ui.User)
+		return newb, nil
+	}
+
 	b, err := huego.Discover()
 	if err != nil {
 		return nil, err
 	}
 	if ui.User != "" {
+		data[appName] = UserInfo{
+			User:     ui.User,
+			LastSync: time.Now(),
+			LastIP:   b,
+		}
+		err := saveData(data, filename)
 		newb := b.Login(ui.User)
-		return newb, nil
+		return newb, err
 	}
+
 	fmt.Println("Please press the Hue Bridge button, then press Enter")
 	fmt.Scanln()
 	user, err := b.CreateUser(appName)
@@ -57,18 +73,20 @@ func DiscoverAndConnectFromConfig(appName string) (*huego.Bridge, error) {
 	data[appName] = UserInfo{User: user}
 
 	b = b.Login(user)
-
-	f, err := os.Create(filename)
-	defer f.Close()
-	if err != nil {
-		return nil, err
-	}
-	err = json.NewEncoder(f).Encode(data)
+	err = saveData(data, filename)
 	return b, err
 }
 
+func saveData(data map[string]UserInfo, filename string) error {
+	f, err := os.Create(filename)
+	defer f.Close()
+	if err != nil {
+		return err
+	}
+	return json.NewEncoder(f).Encode(data)
+}
+
 func main() {
-	fmt.Println("vim-go")
 	b, err := DiscoverAndConnectFromConfig("barak-hue-test")
 	if err != nil {
 		panic(err)