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// Copyright 2023 ROC. 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 cache
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import (
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"bytes"
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"encoding/gob"
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"fmt"
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"strconv"
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"strings"
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"time"
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"github.com/Masterminds/semver/v3"
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"github.com/rocboss/paopao-ce/internal/conf"
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"github.com/rocboss/paopao-ce/internal/core"
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"github.com/rocboss/paopao-ce/pkg/types"
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"github.com/sirupsen/logrus"
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)
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const (
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_cacheIndexKey = "paopao_index"
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)
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var (
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_ core.CacheIndexService = (*cacheIndexSrv)(nil)
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_ core.VersionInfo = (*cacheIndexSrv)(nil)
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)
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type postsEntry struct {
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key string
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tweets *core.IndexTweetList
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}
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type tweetsCache interface {
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core.VersionInfo
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getTweetsBytes(key string) ([]byte, error)
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setTweetsBytes(key string, bs []byte) error
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delTweets(keys []string) error
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allKeys() ([]string, error)
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}
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type cacheIndexSrv struct {
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ips core.IndexPostsService
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ams core.AuthorizationManageService
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name string
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version *semver.Version
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indexActionCh chan *core.IndexAction
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cachePostsCh chan *postsEntry
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cache tweetsCache
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lastCacheResetTime time.Time
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preventDuration time.Duration
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}
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func (s *cacheIndexSrv) IndexPosts(user *core.User, offset int, limit int) (*core.IndexTweetList, error) {
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key := s.keyFrom(user, offset, limit)
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posts, err := s.getPosts(key)
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if err == nil {
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logrus.Debugf("cacheIndexSrv.IndexPosts get index posts from cache by key: %s", key)
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return posts, nil
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}
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if posts, err = s.ips.IndexPosts(user, offset, limit); err != nil {
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return nil, err
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}
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logrus.Debugf("cacheIndexSrv.IndexPosts get index posts from database by key: %s", key)
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s.cachePosts(key, posts)
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return posts, nil
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}
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func (s *cacheIndexSrv) getPosts(key string) (*core.IndexTweetList, error) {
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data, err := s.cache.getTweetsBytes(key)
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if err != nil {
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logrus.Debugf("cacheIndexSrv.getPosts get posts by key: %s from cache err: %v", key, err)
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return nil, err
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}
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buf := bytes.NewBuffer(data)
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dec := gob.NewDecoder(buf)
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var resp core.IndexTweetList
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if err := dec.Decode(&resp); err != nil {
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logrus.Debugf("cacheIndexSrv.getPosts get posts from cache in decode err: %v", err)
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return nil, err
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}
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return &resp, nil
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}
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func (s *cacheIndexSrv) cachePosts(key string, tweets *core.IndexTweetList) {
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entry := &postsEntry{key: key, tweets: tweets}
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select {
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case s.cachePostsCh <- entry:
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logrus.Debugf("cacheIndexSrv.cachePosts cachePosts by chan of key: %s", key)
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default:
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go func(ch chan<- *postsEntry, entry *postsEntry) {
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logrus.Debugf("cacheIndexSrv.cachePosts cachePosts indexAction by goroutine of key: %s", key)
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ch <- entry
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}(s.cachePostsCh, entry)
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}
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}
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func (s *cacheIndexSrv) setPosts(entry *postsEntry) {
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var buf bytes.Buffer
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enc := gob.NewEncoder(&buf)
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if err := enc.Encode(entry.tweets); err != nil {
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logrus.Debugf("cacheIndexSrv.setPosts setPosts encode post entry err: %v", err)
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return
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}
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if err := s.cache.setTweetsBytes(entry.key, buf.Bytes()); err != nil {
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logrus.Debugf("cacheIndexSrv.setPosts setPosts set cache err: %v", err)
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}
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logrus.Debugf("cacheIndexSrv.setPosts setPosts set cache by key: %s", entry.key)
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}
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func (s *cacheIndexSrv) keyFrom(user *core.User, offset int, limit int) string {
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var userId int64 = -1
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if user != nil {
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userId = user.ID
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}
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return fmt.Sprintf("%s:%d:%d:%d", _cacheIndexKey, userId, offset, limit)
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}
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func (s *cacheIndexSrv) SendAction(act core.IdxAct, post *core.Post) {
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action := core.NewIndexAction(act, post)
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select {
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case s.indexActionCh <- action:
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logrus.Debugf("cacheIndexSrv.SendAction send indexAction by chan: %s", act)
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default:
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go func(ch chan<- *core.IndexAction, act *core.IndexAction) {
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logrus.Debugf("cacheIndexSrv.SendAction send indexAction by goroutine: %s", action.Act)
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ch <- act
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}(s.indexActionCh, action)
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}
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}
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func (s *cacheIndexSrv) startIndexPosts() {
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for {
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select {
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case entry := <-s.cachePostsCh:
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s.setPosts(entry)
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case action := <-s.indexActionCh:
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s.handleIndexAction(action)
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}
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}
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}
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func (s *cacheIndexSrv) handleIndexAction(action *core.IndexAction) {
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act, post := action.Act, action.Post
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// 创建/删除 私密推文特殊处理
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switch act {
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case core.IdxActCreatePost, core.IdxActDeletePost:
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if post.Visibility == core.PostVisitPrivate {
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s.deleteCacheByUserId(post.UserID, true)
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return
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}
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}
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// 如果在s.preventDuration时间内就清除所有缓存，否则只清除自个儿的缓存
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// TODO: 需要优化只清除受影响的缓存，后续完善
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if time.Since(s.lastCacheResetTime) > s.preventDuration {
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s.deleteCacheByUserId(post.UserID, false)
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} else {
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s.deleteCacheByUserId(post.UserID, true)
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}
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}
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func (s *cacheIndexSrv) deleteCacheByUserId(id int64, oneself bool) {
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var keys []string
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userId := strconv.FormatInt(id, 10)
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friendSet := core.FriendSet{}
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if !oneself {
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friendSet = s.ams.MyFriendSet(id)
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}
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friendSet[userId] = types.Empty{}
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// 获取需要删除缓存的key，目前是仅删除自个儿的缓存
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allKeys, err := s.cache.allKeys()
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if err != nil {
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logrus.Debugf("cacheIndexSrv.deleteCacheByUserId userId: %s err:%s", userId, err)
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}
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for _, key := range allKeys {
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keyParts := strings.Split(key, ":")
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if len(keyParts) > 2 && keyParts[0] == "index" {
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if _, ok := friendSet[keyParts[1]]; ok {
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keys = append(keys, key)
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}
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}
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}
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// 执行删缓存
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s.cache.delTweets(keys)
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s.lastCacheResetTime = time.Now()
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logrus.Debugf("cacheIndexSrv.deleteCacheByUserId userId:%s oneself:%t keys:%d", userId, oneself, len(keys))
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}
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func (s *cacheIndexSrv) Name() string {
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return s.name
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}
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func (s *cacheIndexSrv) Version() *semver.Version {
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return s.version
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}
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func newCacheIndexSrv(ips core.IndexPostsService, ams core.AuthorizationManageService, tc tweetsCache) *cacheIndexSrv {
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cacheIndex := &cacheIndexSrv{
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ips: ips,
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ams: ams,
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cache: tc,
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name: tc.Name(),
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version: tc.Version(),
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preventDuration: 10 * time.Second,
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}
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// indexActionCh capacity custom configure by conf.yaml need in [10, 10000]
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// or re-compile source to adjust min/max capacity
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capacity := conf.CacheIndexSetting.MaxUpdateQPS
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if capacity < 10 {
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capacity = 10
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} else if capacity > 10000 {
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capacity = 10000
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}
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cacheIndex.indexActionCh = make(chan *core.IndexAction, capacity)
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cacheIndex.cachePostsCh = make(chan *postsEntry, capacity)
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// 启动索引更新器
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go cacheIndex.startIndexPosts()
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return cacheIndex
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}
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Michael Li
2 years ago