401 lines
15 KiB
Go
401 lines
15 KiB
Go
// Copyright 2022 E99p1ant. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package db
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import (
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"context"
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"time"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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"github.com/thanhpk/randstr"
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"gorm.io/gorm"
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"gorm.io/gorm/clause"
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"github.com/tamakyi/TamaBox/internal/dbutil"
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)
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var Conversations ConversationStore
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var (
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ErrDailyMessageLimit = errors.New("已达到每日私聊上限")
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ErrConversationLimit = errors.New("会话已达到消息上限或已关闭")
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)
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type ConversationStore interface {
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Create(ctx context.Context, opts CreateConversationOptions) (*Conversation, error)
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// CreateWithFirstMessage 事务化地建会话 + 首条消息 + 消息计数。
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// 单独写首条消息（用于「发第一条私聊」这类一次性动作），避免失败时留下空会话。
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CreateWithFirstMessage(ctx context.Context, opts CreateConversationOptions, senderID uint, content string) (*Conversation, *Message, error)
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SendMessage(ctx context.Context, opts SendConversationMessageOptions) (*Message, error)
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GetByID(ctx context.Context, id uint) (*Conversation, error)
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GetByToken(ctx context.Context, token string) (*Conversation, error)
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GetByIDAndOwner(ctx context.Context, id, ownerID uint) (*Conversation, error)
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GetByIDAndAsker(ctx context.Context, id, askerID uint) (*Conversation, error)
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IncrementMessageCount(ctx context.Context, id uint) error
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IncrementMessageCountIfBelow(ctx context.Context, id uint, max int) (bool, error)
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DecrementMessageCount(ctx context.Context, id uint) error
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MaybeClose(ctx context.Context, id uint, max int) error
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Close(ctx context.Context, id uint) error
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// ListByOwner 返回某箱主拥有的会话。limit>0 时启用分页（取 limit 条、跳过 offset 条），
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// 用于私聊列表分页；导出场景传 limit=0 取全量，行为与改造前一致。
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ListByOwner(ctx context.Context, ownerID uint, limit, offset int) ([]*Conversation, error)
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// CountByOwner 统计某箱主拥有的会话总数（分页看板与"加载更多"判定用）。
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CountByOwner(ctx context.Context, ownerID uint) (int64, error)
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// ListByAsker 返回某提问者发起的会话；分页语义同 ListByOwner。
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ListByAsker(ctx context.Context, askerID uint, limit, offset int) ([]*Conversation, error)
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// CountByAsker 统计某提问者发起的会话总数。
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CountByAsker(ctx context.Context, askerID uint) (int64, error)
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MarkDeletedByOwner(ctx context.Context, id uint) error
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}
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func NewConversationStore(db *gorm.DB) ConversationStore {
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return &conversations{db}
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}
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type conversations struct {
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*gorm.DB
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}
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type Conversation struct {
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dbutil.Model
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OwnerID uint `gorm:"index:idx_conversation_owner" json:"owner_id"`
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AskerID uint `gorm:"index:idx_conversation_asker" json:"asker_id"`
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Token string `gorm:"size:6;uniqueIndex" json:"token"`
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MaxMessages int `gorm:"default:20" json:"max_messages"`
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MessageCount int `gorm:"default:0" json:"message_count"`
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IsClosed bool `gorm:"default:false" json:"is_closed"`
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IsDeletedByOwner bool `gorm:"default:false" json:"is_deleted_by_owner"` // 新增
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}
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func (c *Conversation) BeforeCreate(tx *gorm.DB) error {
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c.MessageCount = 0
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c.Token = randstr.String(6)
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return nil
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}
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type CreateConversationOptions struct {
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OwnerID uint
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AskerID uint
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MaxMessages int
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}
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type SendConversationMessageOptions struct {
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ConversationID uint
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SenderID uint
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Content string
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Image *CreateMessageImageOptions
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}
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func reserveDailyMessageTx(tx *gorm.DB, ownerID, senderID uint) error {
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var sender User
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if err := tx.Clauses(clause.Locking{Strength: "UPDATE"}).Select("id").First(&sender, senderID).Error; err != nil {
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return errors.Wrap(err, "lock message sender")
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}
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var owner User
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if err := tx.Select("daily_message_limit").First(&owner, ownerID).Error; err != nil {
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return errors.Wrap(err, "get owner daily message limit")
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}
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if owner.DailyMessageLimit <= 0 {
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return nil
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}
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now := time.Now()
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start := time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, now.Location())
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var count int64
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if err := tx.Table("messages").Joins("JOIN conversations ON conversations.id = messages.conversation_id").
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Where("conversations.owner_id = ? AND messages.sender_id = ? AND messages.created_at >= ?", ownerID, senderID, start).
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Count(&count).Error; err != nil {
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return errors.Wrap(err, "count today messages")
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}
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if count >= int64(owner.DailyMessageLimit) {
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return ErrDailyMessageLimit
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}
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return nil
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}
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func (db *conversations) Create(ctx context.Context, opts CreateConversationOptions) (*Conversation, error) {
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conversation := &Conversation{
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OwnerID: opts.OwnerID,
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AskerID: opts.AskerID,
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MaxMessages: opts.MaxMessages,
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}
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if err := db.WithContext(ctx).Create(conversation).Error; err != nil {
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return nil, errors.Wrap(err, "create conversation")
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}
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return conversation, nil
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}
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// CreateWithFirstMessage 在一个事务里完成「建会话 + 写首条消息 + 消息计数」。
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//
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// 原来这三步是三次独立写入：第二步失败时会话已经提交，于是留下一条
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// message_count=0、没有任何消息的「空会话」——箱主的私聊列表里能看到它，
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// 点进去什么都没有；更麻烦的是 Conversations.Create 的 BeforeCreate 已经
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// 生成并占用了一个 6 字符 token（唯一索引），孤儿会话会永久占着这个 token。
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func (db *conversations) CreateWithFirstMessage(
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ctx context.Context, opts CreateConversationOptions, senderID uint, content string,
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) (*Conversation, *Message, error) {
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var conv *Conversation
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var msg *Message
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err := db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
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if senderID == opts.AskerID {
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if err := reserveDailyMessageTx(tx, opts.OwnerID, senderID); err != nil {
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return err
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}
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}
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conv = &Conversation{
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OwnerID: opts.OwnerID,
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AskerID: opts.AskerID,
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MaxMessages: opts.MaxMessages,
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}
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// 走 tx 而不是 db：BeforeCreate 里生成 token 的 hook 同样会被触发。
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if err := tx.Create(conv).Error; err != nil {
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return errors.Wrap(err, "create conversation")
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}
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msg = &Message{
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ConversationID: conv.ID,
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SenderID: senderID,
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Content: content,
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}
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if err := tx.Create(msg).Error; err != nil {
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return errors.Wrap(err, "create first message")
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}
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// 原子自增，与 IncrementMessageCount 保持同一写法
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if err := tx.Model(&Conversation{}).
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Where("id = ?", conv.ID).
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UpdateColumn("message_count", gorm.Expr("message_count + 1")).Error; err != nil {
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return errors.Wrap(err, "increment message count")
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}
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// 私聊定量收集：新建会话即计一条（后续往来消息不重复计数）。
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// 放在事务里而不是 handler 里：原来 handler 在事务之后调 IncrementQuota 且
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// 失败只打 Warn，会话建成了但计数没加，箱主的「已收集」偏少、上限被绕过。
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if err := incrementQuotaTx(tx, opts.OwnerID, FeatureChat, 1); err != nil {
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return errors.Wrap(err, "increment chat quota")
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}
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return nil
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})
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if err != nil {
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return nil, nil, err
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}
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return conv, msg, nil
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}
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func (db *conversations) SendMessage(ctx context.Context, opts SendConversationMessageOptions) (*Message, error) {
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msg := &Message{ConversationID: opts.ConversationID, SenderID: opts.SenderID, Content: opts.Content}
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err := db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
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// 先锁发送者，再锁会话，保证与 CreateWithFirstMessage 的锁顺序一致，
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// 避免并发下两条路径互相等待造成配额检查窗口。
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var sender User
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if err := tx.Clauses(clause.Locking{Strength: "UPDATE"}).Select("id").First(&sender, opts.SenderID).Error; err != nil {
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return errors.Wrap(err, "lock message sender")
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}
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var conv Conversation
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if err := tx.Clauses(clause.Locking{Strength: "UPDATE"}).First(&conv, opts.ConversationID).Error; err != nil {
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return errors.Wrap(err, "lock conversation")
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}
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// 发送者必须是会话双方之一
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if conv.OwnerID != opts.SenderID && conv.AskerID != opts.SenderID {
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return errors.New("sender is not part of the conversation")
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}
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// 只有 asker 发送才消耗 owner 的每日配额
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if conv.AskerID == opts.SenderID {
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if err := reserveDailyMessageTx(tx, conv.OwnerID, opts.SenderID); err != nil {
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return err
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}
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}
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res := tx.Model(&Conversation{}).Where("id = ? AND message_count < max_messages AND is_closed = ?", conv.ID, false).
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UpdateColumn("message_count", gorm.Expr("message_count + 1"))
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if res.Error != nil {
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return errors.Wrap(res.Error, "increment message count")
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}
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if res.RowsAffected == 0 {
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return ErrConversationLimit
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}
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if err := tx.Create(msg).Error; err != nil {
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return errors.Wrap(err, "create message")
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}
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if opts.Image != nil {
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image := *opts.Image
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image.MessageID = msg.ID
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if err := tx.Create(&MessageImage{MessageID: image.MessageID, URL: image.URL, ObjectKey: image.ObjectKey, FileName: image.FileName, FileSize: image.FileSize}).Error; err != nil {
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return errors.Wrap(err, "create message image")
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}
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}
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return 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 msg, nil
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}
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func (db *conversations) GetByID(ctx context.Context, id uint) (*Conversation, error) {
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var conv Conversation
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if err := db.WithContext(ctx).First(&conv, id).Error; err != nil {
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return nil, errors.Wrap(err, "get conversation")
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}
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return &conv, nil
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}
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func (db *conversations) GetByToken(ctx context.Context, token string) (*Conversation, error) {
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var conv Conversation
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if err := db.WithContext(ctx).Where("token = ?", token).First(&conv).Error; err != nil {
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return nil, errors.Wrap(err, "get conversation by token")
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}
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return &conv, nil
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}
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func (db *conversations) GetByIDAndOwner(ctx context.Context, id, ownerID uint) (*Conversation, error) {
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var conv Conversation
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if err := db.WithContext(ctx).Where("id = ? AND owner_id = ?", id, ownerID).First(&conv).Error; err != nil {
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return nil, errors.Wrap(err, "get by owner")
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}
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return &conv, nil
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}
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func (db *conversations) GetByIDAndAsker(ctx context.Context, id, askerID uint) (*Conversation, error) {
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var conv Conversation
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if err := db.WithContext(ctx).Where("id = ? AND asker_id = ?", id, askerID).First(&conv).Error; err != nil {
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return nil, errors.Wrap(err, "get by asker")
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}
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return &conv, nil
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}
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func (db *conversations) IncrementMessageCount(ctx context.Context, id uint) error {
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return db.WithContext(ctx).Model(&Conversation{}).Where("id = ?", id).UpdateColumn("message_count", gorm.Expr("message_count + 1")).Error
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}
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// IncrementMessageCountIfBelow 原子地检查并递增消息计数：
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// 仅当 message_count < max 且未关闭时才 +1，返回 true。
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// 并发场景下（同一对话两端同时发送）可防止消息数超出上限。
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func (db *conversations) IncrementMessageCountIfBelow(ctx context.Context, id uint, max int) (bool, error) {
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res := db.WithContext(ctx).Model(&Conversation{}).
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Where("id = ? AND message_count < ? AND is_closed = ?", id, max, false).
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UpdateColumn("message_count", gorm.Expr("message_count + 1"))
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if res.Error != nil {
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return false, errors.Wrap(res.Error, "increment message count if below")
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}
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return res.RowsAffected > 0, nil
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}
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// DecrementMessageCount 回滚一次消息计数（计数已递增但消息落库失败时调用）。
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func (db *conversations) DecrementMessageCount(ctx context.Context, id uint) error {
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return db.WithContext(ctx).Model(&Conversation{}).
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Where("id = ? AND message_count > 0", id).
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UpdateColumn("message_count", gorm.Expr("message_count - 1")).Error
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}
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// MaybeClose 当消息数达到上限时关闭对话（幂等，供发送消息后调用）。
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func (db *conversations) MaybeClose(ctx context.Context, id uint, max int) error {
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return db.WithContext(ctx).Model(&Conversation{}).
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Where("id = ? AND message_count >= ? AND is_closed = ?", id, max, false).
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Update("is_closed", true).Error
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}
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func (db *conversations) Close(ctx context.Context, id uint) error {
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return db.WithContext(ctx).Model(&Conversation{}).Where("id = ?", id).Update("is_closed", true).Error
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}
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func (db *conversations) ListByOwner(ctx context.Context, ownerID uint, limit, offset int) ([]*Conversation, error) {
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var convs []*Conversation
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q := db.WithContext(ctx).Where("owner_id = ? AND is_deleted_by_owner = ? AND token != ''", ownerID, false).
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Order("created_at DESC")
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if limit > 0 {
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q = q.Limit(limit)
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if offset > 0 {
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q = q.Offset(offset)
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}
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}
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if err := q.Find(&convs).Error; err != nil {
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return nil, errors.Wrap(err, "list by owner")
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}
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return convs, nil
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}
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func (db *conversations) CountByOwner(ctx context.Context, ownerID uint) (int64, error) {
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var count int64
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if err := db.WithContext(ctx).Model(&Conversation{}).
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Where("owner_id = ? AND is_deleted_by_owner = ? AND token != ''", ownerID, false).
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Count(&count).Error; err != nil {
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return 0, errors.Wrap(err, "count by owner")
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}
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return count, nil
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}
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func (db *conversations) ListByAsker(ctx context.Context, askerID uint, limit, offset int) ([]*Conversation, error) {
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var convs []*Conversation
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q := db.WithContext(ctx).Where("asker_id = ? AND is_deleted_by_owner = ? AND token != ''", askerID, false).
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Order("created_at DESC")
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if limit > 0 {
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q = q.Limit(limit)
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if offset > 0 {
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q = q.Offset(offset)
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}
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}
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if err := q.Find(&convs).Error; err != nil {
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return nil, errors.Wrap(err, "list by asker")
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}
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return convs, nil
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}
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func (db *conversations) CountByAsker(ctx context.Context, askerID uint) (int64, error) {
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var count int64
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if err := db.WithContext(ctx).Model(&Conversation{}).
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Where("asker_id = ? AND is_deleted_by_owner = ? AND token != ''", askerID, false).
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Count(&count).Error; err != nil {
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return 0, errors.Wrap(err, "count by asker")
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}
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return count, nil
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}
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func (db *conversations) MarkDeletedByOwner(ctx context.Context, id uint) error {
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var conv Conversation
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if err := db.WithContext(ctx).First(&conv, id).Error; err != nil {
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if errors.Is(err, gorm.ErrRecordNotFound) {
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// 已删除或不存在：幂等，不影响调用方。
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return nil
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}
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return errors.Wrap(err, "get conversation for delete")
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}
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if conv.IsDeletedByOwner {
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// 已经是删除状态：幂等返回，避免重复请求多次回退配额计数。
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return nil
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}
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// 用「条件更新 + RowsAffected」代替纯 Update：
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// 原来的写法是 check-then-act，双击「删除会话」或前端重复提交时，两个请求
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// 都能读到 is_deleted_by_owner=false，于是都执行 UPDATE、都执行一次
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// IncrementQuota(-1)。IncrementQuota 有 quota_count>0 兜底不会变负，
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// 但会白吃掉本用户其他会话的计数 —— 表现为定量收集提前关闭，
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// 而箱主重置计数也校准不回来。
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res := db.WithContext(ctx).Model(&Conversation{}).
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Where("id = ? AND is_deleted_by_owner = ?", id, false).
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Update("is_deleted_by_owner", true)
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if res.Error != nil {
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return errors.Wrap(res.Error, "mark conversation deleted by owner")
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}
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if res.RowsAffected == 0 {
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// 并发里被另一个请求抢先删掉了：它已经做过配额回退，这里不能再来一次。
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return nil
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}
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// 回退定量收集计数：删除私聊会话等价于少一条已收集内容，
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// 否则达上限后即便删掉旧会话，功能仍会显示 quota_reached 关闭，须手动重置计数。
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if conv.OwnerID != 0 {
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// 用本 store 的 *gorm.DB 构造，避免依赖包级全局单例（详见 DeleteByID 注释）。
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if err := NewFeatureControlsStore(db.DB).IncrementQuota(ctx, conv.OwnerID, FeatureChat, -1); err != nil {
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logrus.WithContext(ctx).WithError(err).Errorf("Failed to decrement chat quota for user %d", conv.OwnerID)
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}
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}
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return nil
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}
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