style(controller): re-organize controller project structure: split controller and pipes

internal/controller/pipes/email.go

@@ -0,0 +1,113 @@
+package pipes
+
+import (
+	"fmt"
+
+	gomail "gopkg.in/mail.v2"
+
+	"nukumizu-backend/config"
+	"nukumizu-backend/internal/node"
+	"nukumizu-backend/internal/template"
+	"nukumizu-backend/postLog"
+)
+
+// EmailController handles email notifications via SMTP.
+type EmailController struct {
+	cfg config.EmailConfig
+}
+
+// NewEmailController creates a new Email controller.
+func NewEmailController(cfg config.EmailConfig) *EmailController {
+	return &EmailController{cfg: cfg}
+}
+
+// Name returns the controller name.
+func (e *EmailController) Name() string {
+	return "email"
+}
+
+// Start initializes the Email controller.
+func (e *EmailController) Start() error {
+	if !e.cfg.Enabled {
+		postLog.Info("Email controller is disabled")
+		return nil
+	}
+	postLog.Info("Email controller started")
+	return nil
+}
+
+// Stop shuts down the Email controller.
+func (e *EmailController) Stop() {
+	postLog.Info("Email controller stopped")
+}
+
+// IsEnabled returns whether the controller is enabled.
+func (e *EmailController) IsEnabled() bool {
+	return e.cfg.Enabled
+}
+
+// HandleCommand is not supported for Email (status-only controller).
+// This controller does not implement CommandController.
+
+// SendStatusChange sends a status change notification via Email.
+func (e *EmailController) SendStatusChange(change node.StatusChange) error {
+	if !e.cfg.Enabled {
+		return nil
+	}
+	if len(e.cfg.To) == 0 {
+		postLog.Debug("Email controller has no recipients configured")
+		return nil
+	}
+
+	cfg := config.GetConfig()
+	params := template.BuildParamsFromStatusChange(change)
+	body := template.Render(cfg.ControllerMessage.ServerStatusChanged, params)
+
+	subject := fmt.Sprintf("Server Status Change: %s - %s", change.Name, change.Event)
+	return e.sendEmail(subject, body)
+}
+
+// SendServerList sends the server list via Email.
+func (e *EmailController) SendServerList(onlineServers, offlineServers string) error {
+	if !e.cfg.Enabled || len(e.cfg.To) == 0 {
+		return nil
+	}
+
+	cfg := config.GetConfig()
+	params := template.BuildParamsFromServerList()
+	body := template.Render(cfg.ControllerMessage.ServerList, params)
+
+	return e.sendEmail("Server List", body)
+}
+
+// SendExecuteResult sends a command execution result via Email.
+func (e *EmailController) SendExecuteResult(serverName, serverUUID, command, result string) error {
+	if !e.cfg.Enabled || len(e.cfg.To) == 0 {
+		return nil
+	}
+
+	cfg := config.GetConfig()
+	params := template.BuildParamsFromExecResult(serverName, serverUUID, command, result)
+	body := template.Render(cfg.ControllerMessage.ServerExecuteResult, params)
+
+	subject := fmt.Sprintf("Command Result: %s on %s", command, serverName)
+	return e.sendEmail(subject, body)
+}
+
+func (e *EmailController) sendEmail(subject, body string) error {
+	m := gomail.NewMessage()
+	m.SetHeader("From", e.cfg.From)
+	m.SetHeader("To", e.cfg.To...)
+	m.SetHeader("Subject", subject)
+	m.SetBody("text/plain", body)
+
+	d := gomail.NewDialer(e.cfg.SMTPHost, e.cfg.SMTPPort, e.cfg.Username, e.cfg.Password)
+
+	if err := d.DialAndSend(m); err != nil {
+		postLog.Warning("Failed to send email: " + err.Error())
+		return err
+	}
+
+	postLog.Debug("Email sent successfully to " + fmt.Sprintf("%v", e.cfg.To))
+	return nil
+}