chore: use interfaces for all other services

internal/app/audit/recorder.go

@@ -6,21 +6,35 @@ import (
 	"log/slog"
 	"time"
 
-	evbus "github.com/vardius/message-bus"
-
 	"github.com/h44z/wg-portal/internal/app"
 	"github.com/h44z/wg-portal/internal/config"
 	"github.com/h44z/wg-portal/internal/domain"
 )
 
+// region dependencies
+
+type DatabaseRepo interface {
+	// SaveAuditEntry saves an audit entry to the database
+	SaveAuditEntry(ctx context.Context, entry *domain.AuditEntry) error
+}
+
+type EventBus interface {
+	// Subscribe subscribes to a topic
+	Subscribe(topic string, fn interface{}) error
+}
+
+// endregion dependencies
+
+// Recorder is responsible for recording audit events to the database.
 type Recorder struct {
 	cfg *config.Config
-	bus evbus.MessageBus
+	bus EventBus
 
 	db DatabaseRepo
 }
 
-func NewAuditRecorder(cfg *config.Config, bus evbus.MessageBus, db DatabaseRepo) (*Recorder, error) {
+// NewAuditRecorder creates a new audit recorder instance.
+func NewAuditRecorder(cfg *config.Config, bus EventBus, db DatabaseRepo) (*Recorder, error) {
 	r := &Recorder{
 		cfg: cfg,
 		bus: bus,
@@ -36,6 +50,8 @@ func NewAuditRecorder(cfg *config.Config, bus evbus.MessageBus, db DatabaseRepo)
 	return r, nil
 }
 
+// StartBackgroundJobs starts background jobs for the audit recorder.
+// This method is non-blocking and returns immediately.
 func (r *Recorder) StartBackgroundJobs(ctx context.Context) {
 	if !r.cfg.Statistics.CollectAuditData {
 		return // noting to do