136 lines
4.9 KiB
Go
136 lines
4.9 KiB
Go
package events
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import (
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"strconv"
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"strings"
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kafkabus "github.com/LoveLosita/smartflow/backend/infra/kafka"
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outboxinfra "github.com/LoveLosita/smartflow/backend/infra/outbox"
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tokencontracts "github.com/LoveLosita/smartflow/backend/shared/contracts/tokenstore"
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sharedevents "github.com/LoveLosita/smartflow/backend/shared/events"
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)
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// ForumRewardGrantRecorder 描述论坛奖励事件消费后写入 token-store 账本所需的最小能力。
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//
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// 职责边界：
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// 1. 只暴露论坛奖励入账能力，不暴露商品、订单和用户可见查询接口；
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// 2. 由 token-store 自己解析奖励额度和幂等规则，handler 不计算 Token 数量；
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// 3. 接口用于隔离 service/events 与 token-store 具体 RPC client 实现。
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type ForumRewardGrantRecorder interface {
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RecordForumRewardGrant(ctx context.Context, req tokencontracts.RecordForumRewardGrantRequest) (*tokencontracts.TokenGrantView, error)
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}
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// RegisterForumPostLikedRewardHandler 注册计划被点赞奖励消费者。
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func RegisterForumPostLikedRewardHandler(
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bus OutboxBus,
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outboxRepo *outboxinfra.Repository,
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recorder ForumRewardGrantRecorder,
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) error {
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return registerForumRewardHandler(bus, outboxRepo, recorder, sharedevents.ForumPostLikedEventType, sharedevents.ForumRewardSourceLike)
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}
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// RegisterForumPostImportedRewardHandler 注册计划被导入奖励消费者。
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func RegisterForumPostImportedRewardHandler(
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bus OutboxBus,
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outboxRepo *outboxinfra.Repository,
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recorder ForumRewardGrantRecorder,
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) error {
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return registerForumRewardHandler(bus, outboxRepo, recorder, sharedevents.ForumPostImportedEventType, sharedevents.ForumRewardSourceImport)
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}
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// registerForumRewardHandler 收敛论坛奖励事件的通用解析、校验和入账流程。
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//
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// 步骤说明：
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// 1. 先校验 outbox 与 token-store 依赖，避免启动期注册半截 handler；
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// 2. 消费时先检查版本和 payload，明显不可修复的坏消息直接标记 dead；
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// 3. 再调用 token-store 内部 RPC 幂等写 token_grants，RPC 临时失败返回 error 交给 outbox 重试；
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// 4. 入账成功后标记 consumed，确保重复消费不会重复发放。
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func registerForumRewardHandler(
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bus OutboxBus,
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outboxRepo *outboxinfra.Repository,
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recorder ForumRewardGrantRecorder,
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eventType string,
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source string,
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) error {
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if bus == nil {
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return errors.New("event bus is nil")
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}
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if outboxRepo == nil {
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return errors.New("outbox repository is nil")
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}
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if recorder == nil {
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return errors.New("forum reward grant recorder is nil")
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}
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eventOutboxRepo, err := scopedOutboxRepoForEvent(outboxRepo, eventType)
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if err != nil {
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return err
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}
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handler := func(ctx context.Context, envelope kafkabus.Envelope) error {
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if !isAllowedForumRewardEventVersion(envelope.EventVersion) {
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_ = eventOutboxRepo.MarkDead(ctx, envelope.OutboxID, fmt.Sprintf("论坛奖励事件版本不受支持: %s", envelope.EventVersion))
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return nil
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}
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var payload sharedevents.ForumPostRewardPayload
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if unmarshalErr := json.Unmarshal(envelope.Payload, &payload); unmarshalErr != nil {
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_ = eventOutboxRepo.MarkDead(ctx, envelope.OutboxID, "解析论坛奖励载荷失败: "+unmarshalErr.Error())
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return nil
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}
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if validateErr := payload.Validate(); validateErr != nil {
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_ = eventOutboxRepo.MarkDead(ctx, envelope.OutboxID, "论坛奖励载荷非法: "+validateErr.Error())
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return nil
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}
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if payload.EventType() != eventType {
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_ = eventOutboxRepo.MarkDead(ctx, envelope.OutboxID, fmt.Sprintf("论坛奖励事件类型不匹配: envelope=%s payload=%s", eventType, payload.EventType()))
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return nil
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}
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eventID := strings.TrimSpace(envelope.EventID)
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if eventID == "" {
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eventID = strings.TrimSpace(payload.EventID)
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}
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if eventID == "" {
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_ = eventOutboxRepo.MarkDead(ctx, envelope.OutboxID, "论坛奖励 event_id 为空")
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return nil
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}
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_, err := recorder.RecordForumRewardGrant(ctx, tokencontracts.RecordForumRewardGrantRequest{
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EventID: eventID,
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ReceiverUserID: payload.RewardReceiverUserID,
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Source: forumRewardSource(payload, source),
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SourceRefID: forumRewardSourceRefID(payload, source),
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})
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if err != nil {
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return err
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}
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return eventOutboxRepo.MarkConsumed(ctx, envelope.OutboxID)
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}
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return bus.RegisterEventHandler(eventType, handler)
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}
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func isAllowedForumRewardEventVersion(version string) bool {
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version = strings.TrimSpace(version)
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return version == "" || version == sharedevents.ForumRewardEventVersion
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}
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func forumRewardSource(payload sharedevents.ForumPostRewardPayload, fallback string) string {
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source := strings.TrimSpace(payload.Source)
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if source != "" {
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return source
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}
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return fallback
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}
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func forumRewardSourceRefID(payload sharedevents.ForumPostRewardPayload, source string) string {
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if source == sharedevents.ForumRewardSourceImport && payload.ImportID > 0 {
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return strconv.FormatUint(payload.ImportID, 10)
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}
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return strconv.FormatUint(payload.PostID, 10)
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}
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