Refactor error handling and improve code formatting in runners.go. Replace fmt.Errorf with errors.New for better error management. Clean up whitespace and enhance readability in various API response structures.

internal/api/runners.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"database/sql"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"log"
@@ -295,10 +296,10 @@ func (s *Server) handleUpdateTaskStep(w http.ResponseWriter, r *http.Request) {
 	if err == nil {
 		// Broadcast step update to frontend
 		s.broadcastTaskUpdate(jobID, taskID, "step_update", map[string]interface{}{
-			"step_id":      stepID,
-			"step_name":    req.StepName,
-			"status":       req.Status,
-			"duration_ms":  req.DurationMs,
+			"step_id":       stepID,
+			"step_name":     req.StepName,
+			"status":        req.Status,
+			"duration_ms":   req.DurationMs,
 			"error_message": req.ErrorMessage,
 		})
 	}
@@ -338,7 +339,7 @@ func (s *Server) handleDownloadJobContext(w http.ResponseWriter, r *http.Request
 	// Set appropriate headers for tar file
 	w.Header().Set("Content-Type", "application/x-tar")
 	w.Header().Set("Content-Disposition", "attachment; filename=context.tar")
-	
+
 	// Stream the file to the response
 	io.Copy(w, file)
 }
@@ -1153,8 +1154,8 @@ func (s *Server) updateJobStatusFromTasks(jobID int64) {
 			}
 			// Broadcast job update via WebSocket
 			s.broadcastJobUpdate(jobID, "job_update", map[string]interface{}{
-				"status":      jobStatus,
-				"progress":    progress,
+				"status":       jobStatus,
+				"progress":     progress,
 				"completed_at": now,
 			})
 		}
@@ -1184,7 +1185,7 @@ func (s *Server) updateJobStatusFromTasks(jobID int64) {
 					// Broadcast that a new task was added
 					log.Printf("Broadcasting task_added for job %d: video generation task %d", jobID, videoTaskID)
 					s.broadcastTaskUpdate(jobID, videoTaskID, "task_added", map[string]interface{}{
-						"task_id": videoTaskID,
+						"task_id":   videoTaskID,
 						"task_type": types.TaskTypeVideoGeneration,
 					})
 					// Update job status to ensure it's marked as running (has pending video task)
@@ -1790,7 +1791,7 @@ func (s *Server) assignTaskToRunner(runnerID int64, taskID int64) error {
 			types.TaskStatusPending, taskID,
 		)
 		s.logTaskEvent(taskID, nil, types.LogLevelError, errMsg, "")
-		return fmt.Errorf(errMsg)
+		return errors.New(errMsg)
 	}
 
 	// Note: Task is already assigned in database by the atomic update in distributeTasksToRunners