add storage service

internal/services/iscsi.go

@@ -0,0 +1,216 @@
+package services
+
+import (
+	"fmt"
+	"os/exec"
+	"strings"
+	"sync"
+
+	"gitea.avt.data-center.id/othman.suseno/atlas/internal/models"
+)
+
+// ISCSIService manages iSCSI target service integration
+type ISCSIService struct {
+	mu            sync.RWMutex
+	targetcliPath string
+}
+
+// NewISCSIService creates a new iSCSI service manager
+func NewISCSIService() *ISCSIService {
+	return &ISCSIService{
+		targetcliPath: "targetcli",
+	}
+}
+
+// ApplyConfiguration applies iSCSI target configurations
+func (s *ISCSIService) ApplyConfiguration(targets []models.ISCSITarget) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	// For each target, ensure it exists and is configured
+	for _, target := range targets {
+		if !target.Enabled {
+			// Disable target if it exists
+			if err := s.disableTarget(target.IQN); err != nil {
+				// Log but continue
+			}
+			continue
+		}
+
+		// Create or update target
+		if err := s.createTarget(target); err != nil {
+			return fmt.Errorf("create target %s: %w", target.IQN, err)
+		}
+
+		// Configure ACLs
+		if err := s.configureACLs(target); err != nil {
+			return fmt.Errorf("configure ACLs for %s: %w", target.IQN, err)
+		}
+
+		// Configure LUNs
+		if err := s.configureLUNs(target); err != nil {
+			return fmt.Errorf("configure LUNs for %s: %w", target.IQN, err)
+		}
+	}
+
+	return nil
+}
+
+// createTarget creates an iSCSI target
+func (s *ISCSIService) createTarget(target models.ISCSITarget) error {
+	// Use targetcli to create target
+	// Format: targetcli /iscsi create <IQN>
+	cmd := exec.Command(s.targetcliPath, "/iscsi", "create", target.IQN)
+	if err := cmd.Run(); err != nil {
+		// Target might already exist, which is OK
+		// Check if it actually exists
+		if !s.targetExists(target.IQN) {
+			return fmt.Errorf("create target failed: %w", err)
+		}
+	}
+
+	return nil
+}
+
+// configureACLs configures initiator ACLs for a target
+func (s *ISCSIService) configureACLs(target models.ISCSITarget) error {
+	// Get current ACLs
+	currentACLs, _ := s.getACLs(target.IQN)
+
+	// Remove ACLs not in desired list
+	for _, acl := range currentACLs {
+		if !contains(target.Initiators, acl) {
+			cmd := exec.Command(s.targetcliPath, "/iscsi/"+target.IQN+"/tpg1/acls", "delete", acl)
+			cmd.Run() // Ignore errors
+		}
+	}
+
+	// Add new ACLs
+	for _, initiator := range target.Initiators {
+		if !contains(currentACLs, initiator) {
+			cmd := exec.Command(s.targetcliPath, "/iscsi/"+target.IQN+"/tpg1/acls", "create", initiator)
+			if err := cmd.Run(); err != nil {
+				return fmt.Errorf("create ACL %s: %w", initiator, err)
+			}
+		}
+	}
+
+	return nil
+}
+
+// configureLUNs configures LUNs for a target
+func (s *ISCSIService) configureLUNs(target models.ISCSITarget) error {
+	// Get current LUNs
+	currentLUNs, _ := s.getLUNs(target.IQN)
+
+	// Remove LUNs not in desired list
+	for _, lun := range currentLUNs {
+		if !s.hasLUN(target.LUNs, lun) {
+			cmd := exec.Command(s.targetcliPath, "/iscsi/"+target.IQN+"/tpg1/luns", "delete", fmt.Sprintf("lun/%d", lun))
+			cmd.Run() // Ignore errors
+		}
+	}
+
+	// Add/update LUNs
+	for _, lun := range target.LUNs {
+		// Create LUN mapping
+		// Format: targetcli /iscsi/<IQN>/tpg1/luns create /backstores/zvol/<zvol>
+		zvolPath := "/backstores/zvol/" + lun.ZVOL
+
+		// First ensure the zvol backend exists
+		cmd := exec.Command(s.targetcliPath, "/backstores/zvol", "create", lun.ZVOL, lun.ZVOL)
+		cmd.Run() // Ignore if already exists
+
+		// Create LUN
+		cmd = exec.Command(s.targetcliPath, "/iscsi/"+target.IQN+"/tpg1/luns", "create", zvolPath)
+		if err := cmd.Run(); err != nil {
+			// LUN might already exist
+			if !s.hasLUNID(currentLUNs, lun.ID) {
+				return fmt.Errorf("create LUN %d: %w", lun.ID, err)
+			}
+		}
+	}
+
+	return nil
+}
+
+// Helper functions
+func (s *ISCSIService) targetExists(iqn string) bool {
+	cmd := exec.Command(s.targetcliPath, "/iscsi", "ls")
+	output, err := cmd.Output()
+	if err != nil {
+		return false
+	}
+	return strings.Contains(string(output), iqn)
+}
+
+func (s *ISCSIService) getACLs(iqn string) ([]string, error) {
+	cmd := exec.Command(s.targetcliPath, "/iscsi/"+iqn+"/tpg1/acls", "ls")
+	_, err := cmd.Output()
+	if err != nil {
+		return nil, err
+	}
+	// Parse output to extract ACL names
+	// This is simplified - real implementation would parse targetcli output
+	return []string{}, nil
+}
+
+func (s *ISCSIService) getLUNs(iqn string) ([]int, error) {
+	cmd := exec.Command(s.targetcliPath, "/iscsi/"+iqn+"/tpg1/luns", "ls")
+	_, err := cmd.Output()
+	if err != nil {
+		return nil, err
+	}
+	// Parse output to extract LUN IDs
+	// This is simplified - real implementation would parse targetcli output
+	return []int{}, nil
+}
+
+func (s *ISCSIService) hasLUN(luns []models.LUN, id int) bool {
+	for _, lun := range luns {
+		if lun.ID == id {
+			return true
+		}
+	}
+	return false
+}
+
+func (s *ISCSIService) hasLUNID(luns []int, id int) bool {
+	for _, lunID := range luns {
+		if lunID == id {
+			return true
+		}
+	}
+	return false
+}
+
+func (s *ISCSIService) disableTarget(iqn string) error {
+	cmd := exec.Command(s.targetcliPath, "/iscsi/"+iqn+"/tpg1", "set", "attribute", "enable=0")
+	return cmd.Run()
+}
+
+// GetStatus returns the status of iSCSI target service
+func (s *ISCSIService) GetStatus() (bool, error) {
+	// Check if targetd is running
+	cmd := exec.Command("systemctl", "is-active", "target")
+	if err := cmd.Run(); err == nil {
+		return true, nil
+	}
+
+	// Fallback: check process
+	cmd = exec.Command("pgrep", "-x", "targetd")
+	if err := cmd.Run(); err == nil {
+		return true, nil
+	}
+
+	return false, nil
+}
+
+func contains(slice []string, item string) bool {
+	for _, s := range slice {
+		if s == item {
+			return true
+		}
+	}
+	return false
+}