refactor: Clean up session handling and remove deprecated workspace access endpoints

- Removed deprecated workspace access endpoints from session routes, streamlining API.
- Enhanced session metadata extraction for improved error handling in GetSession.
- Updated comments and TODOs in reconciler and session handler files to reflect ongoing migration to controller-runtime patterns.

Author: Gkrumbach07

components/backend/handlers/sessions.go

@@ -748,10 +748,18 @@ func GetSession(c *gin.Context) {
 		return
 	}
 
+	// Safely extract metadata using type-safe pattern
+	metadata, ok := item.Object["metadata"].(map[string]interface{})
+	if !ok {
+		log.Printf("GetSession: invalid metadata for session %s", sessionName)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "Invalid session metadata"})
+		return
+	}
+
 	session := types.AgenticSession{
 		APIVersion: item.GetAPIVersion(),
 		Kind:       item.GetKind(),
-		Metadata:   item.Object["metadata"].(map[string]interface{}),
+		Metadata:   metadata,
 	}
 
 	if spec, ok := item.Object["spec"].(map[string]interface{}); ok {
@@ -2102,27 +2110,6 @@ func StopSession(c *gin.Context) {
 	c.JSON(http.StatusAccepted, session)
 }
 
-// EnableWorkspaceAccess is deprecated - temporary content pods have been removed
-// POST /api/projects/:projectName/agentic-sessions/:sessionName/workspace/enable
-func EnableWorkspaceAccess(c *gin.Context) {
-	c.JSON(http.StatusGone, gin.H{
-		"error":   "Temporary workspace access has been removed",
-		"message": "Session artifacts are now stored in S3. Access artifacts directly from your S3 bucket.",
-		"hint":    "Configure S3 storage in project settings to persist session state and artifacts.",
-		"s3Path":  fmt.Sprintf("s3://{bucket}/{namespace}/%s/", c.Param("sessionName")),
-	})
-}
-
-// TouchWorkspaceAccess updates the last-accessed timestamp to keep temp pod alive
-// POST /api/projects/:projectName/agentic-sessions/:sessionName/workspace/touch
-func TouchWorkspaceAccess(c *gin.Context) {
-	// Deprecated: Temp-content pods no longer exist
-	c.JSON(http.StatusGone, gin.H{
-		"error":   "Temporary workspace access has been removed",
-		"message": "Session artifacts are stored in S3 and do not require touch/keepalive.",
-	})
-}
-
 // GetSessionK8sResources returns job, pod, and PVC information for a session
 // GET /api/projects/:projectName/agentic-sessions/:sessionName/k8s-resources
 func GetSessionK8sResources(c *gin.Context) {

components/backend/routes.go

@@ -56,8 +56,6 @@ func registerRoutes(r *gin.Engine) {
 			projectGroup.POST("/agentic-sessions/:sessionName/clone", handlers.CloneSession)
 			projectGroup.POST("/agentic-sessions/:sessionName/start", handlers.StartSession)
 			projectGroup.POST("/agentic-sessions/:sessionName/stop", handlers.StopSession)
-			projectGroup.POST("/agentic-sessions/:sessionName/workspace/enable", handlers.EnableWorkspaceAccess)
-			projectGroup.POST("/agentic-sessions/:sessionName/workspace/touch", handlers.TouchWorkspaceAccess)
 			projectGroup.GET("/agentic-sessions/:sessionName/workspace", handlers.ListSessionWorkspace)
 			projectGroup.GET("/agentic-sessions/:sessionName/workspace/*path", handlers.GetSessionWorkspaceFile)
 			projectGroup.PUT("/agentic-sessions/:sessionName/workspace/*path", handlers.PutSessionWorkspaceFile)

components/operator/internal/handlers/reconciler.go

@@ -10,15 +10,20 @@ import (
 	"time"
 
 	corev1 "k8s.io/api/core/v1"
-	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
 
 	"ambient-code-operator/internal/config"
-	"ambient-code-operator/internal/types"
 )
 
 // ReconcilePendingSession handles the Pending phase - creates pod and services.
 // This is the main entry point called from the controller for pending sessions.
+//
+// TODO(controller-runtime-migration): This is a transitional wrapper around the legacy
+// handleAgenticSessionEvent() function (2,300+ lines). Future work should:
+// 1. Extract phase-specific logic into separate functions (ReconcilePending, ReconcileRunning, etc.)
+// 2. Use controller-runtime patterns (Patch, StatusWriter, etc.) instead of direct API calls
+// 3. Remove handleAgenticSessionEvent() entirely
+// This approach allows adopting controller-runtime framework without rewriting all logic at once.
 func ReconcilePendingSession(ctx context.Context, session *unstructured.Unstructured, appConfig *config.Config) error {
 	// Delegate to existing handleAgenticSessionEvent logic
 	// This is a wrapper that allows the existing code to be called from the controller

components/operator/internal/handlers/sessions.go

@@ -25,20 +25,25 @@ import (
 	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
 	intstr "k8s.io/apimachinery/pkg/util/intstr"
-	"k8s.io/apimachinery/pkg/watch"
 	"k8s.io/client-go/util/retry"
 )
 
 // Track which pods are currently being monitored to prevent duplicate goroutines
-// NOTE: This is used by the legacy handleAgenticSessionEvent function which is
-// kept for reference but no longer actively called by the operator.
-// The controller-runtime based reconciler in internal/controller/ handles all
-// AgenticSession reconciliation now.
 var (
 	monitoredPods   = make(map[string]bool)
 	monitoredPodsMu sync.Mutex
 )
 
+// handleAgenticSessionEvent is the legacy reconciliation function containing all session
+// lifecycle logic (~2,300 lines). It's called by ReconcilePendingSession() wrapper.
+//
+// TODO(controller-runtime-migration): This function should be refactored into smaller,
+// phase-specific reconcilers that use controller-runtime patterns. Current architecture:
+// - ✅ Controller-runtime framework adopted (work queue, leader election, metrics)
+// - ⚠️ Business logic still uses legacy patterns (direct API calls, manual status updates)
+// - 🔜 Future: Break into ReconcilePending, ReconcileRunning, ReconcileStopped functions
+//
+// This transitional approach allows framework adoption without rewriting 2,300 lines at once.
 func handleAgenticSessionEvent(obj *unstructured.Unstructured) error {
 	name := obj.GetName()
 	sessionNamespace := obj.GetNamespace()
@@ -681,35 +686,6 @@ func handleAgenticSessionEvent(obj *unstructured.Unstructured) error {
 		})
 	}
 
-	// Extract repos configuration (simplified format: url and branch)
-	type RepoConfig struct {
-		URL    string
-		Branch string
-	}
-
-	var repos []RepoConfig
-
-	// Read repos[] array format
-	if reposArr, found, _ := unstructured.NestedSlice(spec, "repos"); found && len(reposArr) > 0 {
-		repos = make([]RepoConfig, 0, len(reposArr))
-		for _, repoItem := range reposArr {
-			if repoMap, ok := repoItem.(map[string]interface{}); ok {
-				repo := RepoConfig{}
-				if url, ok := repoMap["url"].(string); ok {
-					repo.URL = url
-				}
-				if branch, ok := repoMap["branch"].(string); ok {
-					repo.Branch = branch
-				} else {
-					repo.Branch = "main"
-				}
-				if repo.URL != "" {
-					repos = append(repos, repo)
-				}
-			}
-		}
-	}
-
 	// Read autoPushOnComplete flag
 	autoPushOnComplete, _, _ := unstructured.NestedBool(spec, "autoPushOnComplete")