refactor: isolate playback and upload use cases

services/api/internal/playback/events.go

@@ -0,0 +1,88 @@
+package playback
+
+import (
+	"context"
+	"time"
+
+	"github.com/google/uuid"
+
+	"pipu/api/internal/api/gen"
+	"pipu/api/internal/auth"
+)
+
+// EventService owns event acceptance and its transaction; HTTP only authenticates and maps DTOs.
+type EventService struct {
+	store *Store
+	now   func() time.Time
+}
+
+func (s EventService) Accept(ctx context.Context, p auth.Principal, events []gen.PlayEvent) (gen.PostEvents200JSONResponse, error) {
+	now := s.now()
+	ids := make([]uuid.UUID, 0, len(events))
+	for _, e := range events {
+		ids = append(ids, e.TrackId)
+	}
+	durations, err := s.store.TrackDurations(ctx, ids)
+	if err != nil {
+		return gen.PostEvents200JSONResponse{}, err
+	}
+	clientType := s.store.SessionClientType(ctx, p.SessionID)
+
+	out := gen.PostEvents200JSONResponse{}
+	tx, err := s.store.Begin(ctx)
+	if err != nil {
+		return gen.PostEvents200JSONResponse{}, err
+	}
+	defer func() { _ = tx.Rollback(ctx) }()
+	for _, e := range events {
+		dur, known := durations[e.TrackId]
+		at := e.OccurredAt.UTC()
+		if !known || at.Before(now.Add(-maxEventAge)) {
+			out.Rejected++
+			continue
+		}
+		if at.After(now.Add(maxEventClockSkew)) {
+			at = now // часы клиента спешат
+		}
+		ev := Event{
+			ID: e.Id, Type: string(e.Type), TrackID: e.TrackId, OccurredAt: at, PositionMs: e.PositionMs,
+			PlayedMs: e.PlayedMs, ContextID: e.ContextId, WaveSessionID: e.WaveSessionId,
+			Offline: e.Offline != nil && *e.Offline,
+		}
+		if e.ContextType != nil {
+			ct := string(*e.ContextType)
+			ev.ContextType = &ct
+		}
+		inserted, err := s.store.InsertEvent(ctx, tx, p.UserID, clientType, ev)
+		if err != nil {
+			return gen.PostEvents200JSONResponse{}, err
+		}
+		if !inserted {
+			out.Duplicates++
+			continue
+		}
+		out.Accepted++
+		played := 0
+		if e.PlayedMs != nil {
+			played = *e.PlayedMs
+		}
+		o := Judge(ev.Type, played, dur)
+		if o != (Outcome{}) {
+			if err := s.store.ApplyOutcome(ctx, tx, p.UserID, ev, o); err != nil {
+				return gen.PostEvents200JSONResponse{}, err
+			}
+		}
+		if outcome := impressionOutcome(ev.Type, o); outcome != "" && ev.ContextType != nil && *ev.ContextType == "wave" &&
+			ev.ContextID != nil {
+			if sid, err := uuid.Parse(*ev.ContextID); err == nil {
+				if err := s.store.MarkImpression(ctx, tx, sid, ev.TrackID, outcome); err != nil {
+					return gen.PostEvents200JSONResponse{}, err
+				}
+			}
+		}
+	}
+	if err := tx.Commit(ctx); err != nil {
+		return gen.PostEvents200JSONResponse{}, err
+	}
+	return out, nil
+}