feat: design a separate package for health check

internal/health/database.go

@@ -0,0 +1,61 @@
+package health
+
+import (
+	"context"
+	"database/sql"
+	"time"
+
+	"goyco/internal/middleware"
+)
+
+type DatabaseChecker struct {
+	db      *sql.DB
+	monitor middleware.DBMonitor
+}
+
+func NewDatabaseChecker(db *sql.DB, monitor middleware.DBMonitor) *DatabaseChecker {
+	return &DatabaseChecker{
+		db:      db,
+		monitor: monitor,
+	}
+}
+
+func (c *DatabaseChecker) Name() string {
+	return "database"
+}
+
+func (c *DatabaseChecker) Check(ctx context.Context) Result {
+	start := time.Now()
+
+	err := c.db.Ping()
+	latency := time.Since(start)
+
+	result := Result{
+		Status:    StatusHealthy,
+		Latency:   latency,
+		Timestamp: time.Now().UTC(),
+		Details: map[string]any{
+			"ping_time": latency.String(),
+		},
+	}
+
+	if err != nil {
+		result.Status = StatusUnhealthy
+		result.Message = err.Error()
+		return result
+	}
+
+	if c.monitor != nil {
+		stats := c.monitor.GetStats()
+		result.Details["stats"] = map[string]any{
+			"total_queries":    stats.TotalQueries,
+			"slow_queries":     stats.SlowQueries,
+			"average_duration": stats.AverageDuration.String(),
+			"max_duration":     stats.MaxDuration.String(),
+			"error_count":      stats.ErrorCount,
+			"last_query_time":  stats.LastQueryTime.Format(time.RFC3339),
+		}
+	}
+
+	return result
+}