refactor for separation of concern for better readabiliy and maintainability

pkg/task/metrics_store.go

@@ -0,0 +1,87 @@
+package task
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"log/slog"
+	"os"
+	"path/filepath"
+	"time"
+
+	"github.com/LazyBachelor/LazyPM/internal/models"
+)
+
+type MetricsStore interface {
+	Append(ctx context.Context, taskName string, run models.TaskRunMetrics) error
+}
+
+type FileMetricsStore struct {
+	path   string
+	logger *slog.Logger
+}
+
+func NewFileMetricsStore(path string, logger *slog.Logger) *FileMetricsStore {
+	return &FileMetricsStore{
+		path:   path,
+		logger: logger,
+	}
+}
+
+func (s *FileMetricsStore) Append(ctx context.Context, taskName string, run models.TaskRunMetrics) error {
+
+	if s.path == "" {
+		return nil
+	}
+
+	dir := filepath.Dir(s.path)
+	if dir != "." {
+		if err := os.MkdirAll(dir, 0o755); err != nil {
+			return fmt.Errorf("create metrics directory: %w", err)
+		}
+	}
+
+	metrics := models.TaskMetricsFile{
+		TaskName: taskName,
+		Runs:     []models.TaskRunMetrics{},
+	}
+
+	if bytes, err := os.ReadFile(s.path); err == nil {
+		if len(bytes) > 0 {
+			if err := json.Unmarshal(bytes, &metrics); err != nil {
+				return fmt.Errorf("parse metrics file: %w", err)
+			}
+		}
+	} else if !os.IsNotExist(err) {
+		return fmt.Errorf("read metrics file: %w", err)
+	}
+
+	if metrics.TaskName == "" {
+		metrics.TaskName = taskName
+	}
+
+	run.RunID = len(metrics.Runs) + 1
+	metrics.Runs = append(metrics.Runs, run)
+	metrics.Summary = buildTaskStatsSummary(metrics.Runs)
+	metrics.UpdatedAt = time.Now()
+
+	data, err := json.MarshalIndent(metrics, "", "  ")
+	if err != nil {
+		return fmt.Errorf("encode metrics: %w", err)
+	}
+
+	if err := os.WriteFile(s.path, data, 0o644); err != nil {
+		return fmt.Errorf("write metrics file: %w", err)
+	}
+
+	if s.logger != nil {
+		s.logger.Info(
+			"task metrics persisted",
+			"path", s.path,
+			"task", taskName,
+			"run_id", run.RunID,
+		)
+	}
+
+	return nil
+}