feat: refactor watchdog

internal/server/watchdog/watchdog.go

@@ -0,0 +1,61 @@
+package watchdog
+
+import (
+	"log/slog"
+	"orbits-server/internal/server/bootstrap"
+	"orbits-server/internal/server/database"
+	"time"
+
+	"gorm.io/gorm"
+)
+
+type State struct {
+	FS map[string]struct{}
+	DB map[string]database.File
+}
+
+type Result struct {
+	FSOrphans []string
+	DBOrphans []database.File
+}
+
+func Kickoff(env bootstrap.Environment, db *gorm.DB) {
+	interval := time.Second * time.Duration(env.WatchdogInterval)
+	ticker := time.NewTicker(interval)
+
+	go func() {
+		defer ticker.Stop()
+
+		run(env, db)
+
+		for range ticker.C {
+			run(env, db)
+		}
+	}()
+}
+
+func run(env bootstrap.Environment, db *gorm.DB) {
+	slog.Debug("watchdog cycle start")
+
+	fsState, err := scanFS(env)
+	if err != nil {
+		return
+	}
+
+	dbState, err := scanDB(db)
+	if err != nil {
+		return
+	}
+
+	result := reconcile(fsState, dbState)
+
+	if len(result.FSOrphans) > 0 {
+		slog.Info("filesystem orphans detected")
+		applyFS(env, db, result.FSOrphans)
+	}
+
+	if len(result.DBOrphans) > 0 {
+		slog.Info("database orphans detected")
+		applyDB(db, result.DBOrphans)
+	}
+}