142 lines
5.1 KiB
Go
142 lines
5.1 KiB
Go
package service
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import (
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"context"
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"fmt"
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"time"
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roomeventsv1 "hyapp/api/proto/events/room/v1"
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roomv1 "hyapp/api/proto/room/v1"
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walletv1 "hyapp/api/proto/wallet/v1"
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"hyapp/pkg/tencentim"
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"hyapp/pkg/xerr"
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"hyapp/services/room-service/internal/room/command"
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"hyapp/services/room-service/internal/room/outbox"
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"hyapp/services/room-service/internal/room/rank"
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"hyapp/services/room-service/internal/room/state"
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)
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// SendGift 先同步调用 wallet，再在 Room Cell 内完成热度、榜单和房间事件落地。
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func (s *Service) SendGift(ctx context.Context, req *roomv1.SendGiftRequest) (*roomv1.SendGiftResponse, error) {
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// SendGift 的账务不在 room-service 内结算，但房间表现、热度和榜单由 Room Cell 同步更新。
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cmd := command.SendGift{
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Base: baseFromMeta(req.GetMeta()),
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TargetUserID: req.GetTargetUserId(),
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GiftID: req.GetGiftId(),
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GiftCount: req.GetGiftCount(),
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GiftUnitValue: req.GetGiftUnitValue(),
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}
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result, err := s.mutateRoom(ctx, cmd, true, func(now time.Time, current *state.RoomState, localRank *rank.LocalRank) (mutationResult, []outbox.Record, error) {
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if _, exists := current.OnlineUsers[cmd.ActorUserID()]; !exists {
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// 送礼者必须在房间业务 presence 内。
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return mutationResult{}, nil, xerr.New(xerr.NotFound, "sender not in room")
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}
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if _, exists := current.OnlineUsers[cmd.TargetUserID]; !exists {
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// v1 要求礼物目标在房间内，避免给不存在的房间表现目标计榜。
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return mutationResult{}, nil, xerr.New(xerr.NotFound, "target not in room")
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}
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if cmd.GiftCount <= 0 || cmd.GiftUnitValue <= 0 {
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// 非正数礼物会破坏账务和榜单累计语义。
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return mutationResult{}, nil, xerr.New(xerr.InvalidArgument, "gift_count and gift_unit_value must be positive")
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}
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// 钱包扣费在房间状态变更前完成；失败时不写 command log、不进入 Room Cell 提交态。
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billing, err := s.wallet.DebitGift(ctx, &walletv1.DebitGiftRequest{
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CommandId: cmd.ID(),
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RoomId: cmd.RoomID(),
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SenderUserId: cmd.ActorUserID(),
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TargetUserId: cmd.TargetUserID,
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GiftId: cmd.GiftID,
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GiftCount: cmd.GiftCount,
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GiftUnitValue: cmd.GiftUnitValue,
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})
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if err != nil {
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return mutationResult{}, nil, err
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}
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// 扣费成功后，Room Cell 同步更新热度和本地礼物榜。
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current.Heat += billing.GetTotalGiftValue()
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current.GiftRank = localRank.ApplyGift(cmd.ActorUserID(), billing.GetTotalGiftValue(), now)
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current.Version++
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// 送礼事件、热度事件和榜单事件使用同一个房间版本，方便消费者关联同一次命令。
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giftEvent, err := outbox.Build(current.RoomID, "RoomGiftSent", current.Version, now, &roomeventsv1.RoomGiftSent{
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SenderUserId: cmd.ActorUserID(),
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TargetUserId: cmd.TargetUserID,
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GiftId: cmd.GiftID,
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GiftCount: cmd.GiftCount,
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GiftValue: billing.GetTotalGiftValue(),
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BillingReceiptId: billing.GetBillingReceiptId(),
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})
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if err != nil {
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return mutationResult{}, nil, err
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}
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heatEvent, err := outbox.Build(current.RoomID, "RoomHeatChanged", current.Version, now, &roomeventsv1.RoomHeatChanged{
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Delta: billing.GetTotalGiftValue(),
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CurrentHeat: current.Heat,
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})
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if err != nil {
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return mutationResult{}, nil, err
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}
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rankItem := findRankItem(current.GiftRank, cmd.ActorUserID())
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rankEvent, err := outbox.Build(current.RoomID, "RoomRankChanged", current.Version, now, &roomeventsv1.RoomRankChanged{
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UserId: rankItem.UserID,
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Score: rankItem.Score,
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GiftValue: rankItem.GiftValue,
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})
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if err != nil {
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return mutationResult{}, nil, err
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}
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return mutationResult{
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snapshot: current.ToProto(),
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billingReceiptID: billing.GetBillingReceiptId(),
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roomHeat: current.Heat,
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giftRank: cloneProtoRank(current.GiftRank),
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syncEvent: &tencentim.RoomEvent{
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// 同步广播只选 GiftSent 主事件作为客户端房间系统消息，Heat/Rank 通过字段携带。
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EventID: giftEvent.EventID,
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RoomID: current.RoomID,
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EventType: "room_gift_sent",
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ActorUserID: cmd.ActorUserID(),
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TargetUserID: cmd.TargetUserID,
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GiftValue: billing.GetTotalGiftValue(),
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RoomHeat: current.Heat,
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RoomVersion: current.Version,
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Attributes: map[string]string{
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"gift_id": cmd.GiftID,
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"gift_count": fmt.Sprintf("%d", cmd.GiftCount),
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"billing_receipt_id": billing.GetBillingReceiptId(),
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},
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},
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}, []outbox.Record{giftEvent, heatEvent, rankEvent}, nil
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})
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if err != nil {
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return nil, err
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}
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return &roomv1.SendGiftResponse{
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Result: commandResult(result.applied, result.snapshot.GetVersion(), s.clock.Now()),
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BillingReceiptId: result.billingReceiptID,
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RoomHeat: result.roomHeat,
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GiftRank: result.giftRank,
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Room: result.snapshot,
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}, nil
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}
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func findRankItem(items []state.RankItem, userID int64) state.RankItem {
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// 送礼后通常能找到发送方榜单项；找不到时返回 user_id 占位避免空事件。
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for _, item := range items {
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if item.UserID == userID {
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return item
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}
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}
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return state.RankItem{UserID: userID}
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}
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