214 lines
7.2 KiB
Go
214 lines
7.2 KiB
Go
package service
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import (
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"bytes"
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"context"
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"time"
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"hyapp/pkg/appcode"
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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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"hyapp/services/room-service/internal/router"
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)
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func (s *Service) mutateRoom(ctx context.Context, cmd command.Command, replayable bool, mutate func(now time.Time, current *state.RoomState, localRank *rank.LocalRank) (mutationResult, []outbox.Record, error)) (mutationResult, error) {
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startedAt := time.Now()
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var idempotencyMS int64
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var leaseMS int64
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var saveMutationMS int64
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var snapshotMS int64
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var projectionMS int64
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if cmd.RoomID() == "" || cmd.ID() == "" || cmd.ActorUserID() == 0 {
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// command meta 是幂等、路由、审计和权限判断的共同基础，缺一不可。
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return mutationResult{}, xerr.New(xerr.InvalidArgument, "command meta is incomplete")
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}
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if s.isDraining() {
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// 下线中的节点只让已经进入执行链路的命令收尾，不再接收新的 Room Cell 命令。
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return mutationResult{}, xerr.New(xerr.Unavailable, "room service is draining")
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}
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idempotencyStartedAt := time.Now()
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payload, seen, err := s.commandPayloadForIdempotency(ctx, cmd)
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idempotencyMS = elapsedMS(idempotencyStartedAt)
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if err != nil {
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return mutationResult{}, err
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}
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if seen {
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// 幂等命令不重新执行 mutate，也不会再次调用 wallet 或写 outbox。
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snapshot, err := s.currentSnapshot(ctx, cmd.RoomID())
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if err != nil {
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return mutationResult{}, err
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}
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return mutationResult{snapshot: snapshot}, nil
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}
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// 确保当前节点持有房间 lease，并在没有内存 Cell 时完成恢复。
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leaseStartedAt := time.Now()
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roomCell, lease, err := s.ensureCell(ctx, cmd.RoomID())
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leaseMS = elapsedMS(leaseStartedAt)
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if err != nil {
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return mutationResult{}, err
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}
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value, err := roomCell.Do(ctx, func(current *state.RoomState, currentRank *rank.LocalRank) (any, error) {
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// 在副本上执行命令，只有 command log/outbox 保存成功后才整体替换当前状态。
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nextState := current.Clone()
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nextRank := currentRank.Clone()
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now := s.clock.Now()
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result, outboxRecords, err := mutate(now, nextState, nextRank)
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if err != nil {
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// 校验、钱包或业务失败时不提交状态，不写 command log。
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return nil, err
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}
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if result.snapshot == nil {
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// 无特殊返回需求的命令默认返回变更后的快照。
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result.snapshot = nextState.ToProto()
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}
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result.snapshot = snapshotWithApp(ctx, result.snapshot)
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if result.snapshot.GetVersion() != current.Version {
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// 版本变化代表本命令产生实际状态变更，需要持久化命令和事件。
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if err := s.ensureLeaseStillOwned(ctx, cmd.RoomID(), lease); err != nil {
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return nil, err
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}
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saveStartedAt := time.Now()
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if err := s.repository.SaveMutation(ctx, MutationCommit{
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Command: CommandRecord{
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AppCode: appcode.FromContext(ctx),
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RoomID: cmd.RoomID(),
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RoomVersion: nextState.Version,
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CommandID: cmd.ID(),
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CommandType: cmd.Type(),
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Payload: commandPayloadForRecord(payload, result),
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Replayable: replayable,
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OwnerNodeID: s.nodeID,
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LeaseToken: lease.LeaseToken,
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CreatedAtMS: now.UnixMilli(),
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},
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OutboxRecords: outboxRecords,
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RoomStatus: result.roomStatus,
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RoomSeatCount: result.roomSeatCount,
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}); err != nil {
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return nil, err
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}
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saveMutationMS += elapsedMS(saveStartedAt)
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// 保存已提交 outbox 记录，出 Cell 锁后由 outbox worker 异步投递 IM/activity，避免外部慢调用占住房间串行执行队列。
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result.outboxRecords = outboxRecords
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// 持久化成功后再替换内存状态，避免内存提交领先于恢复来源。
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current.ReplaceWith(nextState)
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currentRank.ReplaceWith(nextRank)
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result.snapshot = snapshotWithApp(ctx, current.ToProto())
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result.applied = true
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} else {
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// no-op 命令仍写入 command log，保证相同 command_id 重试可命中幂等，
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// 不同 payload 复用 command_id 会被后续入口拒绝为 CONFLICT。
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if err := s.ensureLeaseStillOwned(ctx, cmd.RoomID(), lease); err != nil {
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return nil, err
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}
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saveStartedAt := time.Now()
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if err := s.repository.SaveMutation(ctx, MutationCommit{
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Command: CommandRecord{
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AppCode: appcode.FromContext(ctx),
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RoomID: cmd.RoomID(),
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RoomVersion: current.Version,
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CommandID: cmd.ID(),
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CommandType: cmd.Type(),
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Payload: payload,
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Replayable: false,
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OwnerNodeID: s.nodeID,
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LeaseToken: lease.LeaseToken,
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CreatedAtMS: now.UnixMilli(),
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},
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}); err != nil {
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return nil, err
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}
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saveMutationMS += elapsedMS(saveStartedAt)
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}
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return result, nil
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})
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if err != nil {
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return mutationResult{}, err
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}
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result := value.(mutationResult)
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if result.applied && shouldSnapshot(result.snapshot, s.snapshotEveryN) {
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// 快照失败时返回错误，因为没有快照会增加恢复成本并可能影响 guard 查询。
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snapshotStartedAt := time.Now()
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if err := s.persistSnapshot(ctx, result.snapshot); err != nil {
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return mutationResult{}, err
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}
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snapshotMS = elapsedMS(snapshotStartedAt)
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}
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if result.applied {
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projectionStartedAt := time.Now()
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// 列表读模型最终一致，失败只记录日志，不回滚已经提交的 Room Cell 命令。
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s.projectRoomListBestEffort(ctx, result.snapshot)
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// 当前房间恢复读模型同样最终一致；权威校验仍以 Room Cell 快照为准。
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s.projectRoomPresenceBestEffort(ctx, result.snapshot)
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projectionMS = elapsedMS(projectionStartedAt)
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}
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logRoomCommandTiming(ctx, cmd.RoomID(), cmd.ID(), cmd.Type(), result.applied, elapsedMS(startedAt), idempotencyMS, leaseMS, saveMutationMS, snapshotMS, projectionMS, result.walletDebitMS, 0, 0, len(result.outboxRecords) > 0, result.syncEvent != nil)
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return result, nil
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}
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func (s *Service) commandPayloadForIdempotency(ctx context.Context, cmd command.Command) ([]byte, bool, error) {
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payload, err := command.Serialize(cmd)
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if err != nil {
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return nil, false, err
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}
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record, exists, err := s.repository.GetCommand(ctx, cmd.RoomID(), cmd.ID())
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if err != nil {
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return nil, false, err
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}
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if !exists {
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return payload, false, nil
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}
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currentIDPayload, err := command.IdempotencyPayload(payload)
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if err != nil {
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return nil, true, err
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}
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storedIDPayload, err := command.IdempotencyPayload(record.Payload)
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if err != nil {
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return nil, true, err
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}
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if record.CommandType != cmd.Type() || !bytes.Equal(storedIDPayload, currentIDPayload) {
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return nil, true, xerr.New(xerr.Conflict, "command_id payload conflict")
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}
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return payload, true, nil
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}
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func commandPayloadForRecord(defaultPayload []byte, result mutationResult) []byte {
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if len(result.commandPayload) > 0 {
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return result.commandPayload
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}
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return defaultPayload
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}
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func (s *Service) ensureLeaseStillOwned(ctx context.Context, roomID string, lease router.Lease) error {
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ok, err := s.directory.VerifyOwner(ctx, runtimeRoomKeyFromContext(ctx, roomID), s.nodeID, lease.LeaseToken, s.clock.Now())
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if err != nil {
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return err
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}
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if !ok {
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return xerr.New(xerr.Unavailable, "room lease is no longer owned by this node")
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}
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return nil
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}
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func elapsedMS(start time.Time) int64 {
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return time.Since(start).Milliseconds()
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}
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