feat(social): add listening activity, shared rooms and modern chat

services/api/internal/wave/wave.go

@@ -67,14 +67,15 @@ type Feedback struct {
 
 // BatchRequest — запрос к рекомендателю.
 type BatchRequest struct {
-	UserID     string     `json:"user_id"`
-	SessionID  string     `json:"session_id"`
-	Activity   *string    `json:"activity"`
-	Mood       *string    `json:"mood"`
-	Seed       *Seed      `json:"seed,omitempty"`
-	ExcludeIDs []string   `json:"exclude_ids"`
-	Feedback   []Feedback `json:"feedback"`
-	N          int        `json:"n"`
+	FriendTrackIDs []string   `json:"friend_track_ids,omitempty"`
+	UserID         string     `json:"user_id"`
+	SessionID      string     `json:"session_id"`
+	Activity       *string    `json:"activity"`
+	Mood           *string    `json:"mood"`
+	Seed           *Seed      `json:"seed,omitempty"`
+	ExcludeIDs     []string   `json:"exclude_ids"`
+	Feedback       []Feedback `json:"feedback"`
+	N              int        `json:"n"`
 }
 
 // Seed — от чего запущена волна.
@@ -295,6 +296,11 @@ func (h *Handler) serve(ctx context.Context, s session, fb []Feedback) (gen.Wave
 		UserID: s.UserID.String(), SessionID: s.ID.String(), Activity: s.Activity, Mood: s.Mood,
 		ExcludeIDs: served, Feedback: fb, N: BatchSize,
 	}
+	friendIDs, friendErr := h.friendCandidates(ctx, s.UserID, served)
+	if friendErr != nil {
+		h.log.WarnContext(ctx, "friend music unavailable", "err", friendErr)
+	}
+	req.FriendTrackIDs = friendIDs
 	if s.SeedType != nil && s.SeedID != nil {
 		req.Seed = &Seed{Type: *s.SeedType, ID: s.SeedID.String()}
 	}
@@ -311,6 +317,9 @@ func (h *Handler) serve(ctx context.Context, s session, fb []Feedback) (gen.Wave
 		if picks, err = h.fallback(ctx, s, served); err != nil {
 			return gen.WaveBatch{}, err
 		}
+		if s.SeedType == nil && len(served)%10 >= 5 {
+			picks = blendFriendPick(picks, friendIDs)
+		}
 	}
 
 	ids := make([]uuid.UUID, 0, len(picks))