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107 lines
2.9 KiB
107 lines
2.9 KiB
package cache
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import (
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"sync/atomic"
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"time"
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"github.com/Masterminds/semver/v3"
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"github.com/rocboss/paopao-ce/internal/core"
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"github.com/rocboss/paopao-ce/internal/model"
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"github.com/rocboss/paopao-ce/internal/model/rest"
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"github.com/sirupsen/logrus"
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)
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var (
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_ core.CacheIndexService = (*simpleCacheIndexServant)(nil)
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_ core.VersionInfo = (*simpleCacheIndexServant)(nil)
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)
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type simpleCacheIndexServant struct {
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ips core.IndexPostsService
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indexActionCh chan core.IndexActionT
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indexPosts *rest.IndexTweetsResp
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atomicIndex atomic.Value
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maxIndexSize int
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checkTick *time.Ticker
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expireIndexTick *time.Ticker
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}
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func (s *simpleCacheIndexServant) IndexPosts(user *model.User, offset int, limit int) (*rest.IndexTweetsResp, error) {
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cacheResp := s.atomicIndex.Load().(*rest.IndexTweetsResp)
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end := offset + limit
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if cacheResp != nil {
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size := len(cacheResp.Tweets)
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logrus.Debugf("simpleCacheIndexServant.IndexPosts get index posts from cache posts: %d offset:%d limit:%d start:%d, end:%d", size, offset, limit, offset, end)
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if size >= end {
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return &rest.IndexTweetsResp{
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Tweets: cacheResp.Tweets[offset:end],
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Total: cacheResp.Total,
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}, nil
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}
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}
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logrus.Debugln("simpleCacheIndexServant.IndexPosts get index posts from database")
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return s.ips.IndexPosts(user, offset, limit)
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}
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func (s *simpleCacheIndexServant) SendAction(act core.IndexActionT) {
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select {
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case s.indexActionCh <- act:
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logrus.Debugf("simpleCacheIndexServant.SendAction send indexAction by chan: %s", act)
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default:
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go func(ch chan<- core.IndexActionT, act core.IndexActionT) {
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logrus.Debugf("simpleCacheIndexServant.SendAction send indexAction by goroutine: %s", act)
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ch <- act
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}(s.indexActionCh, act)
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}
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}
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func (s *simpleCacheIndexServant) startIndexPosts() {
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var err error
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for {
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select {
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case <-s.checkTick.C:
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if s.indexPosts == nil {
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logrus.Debugf("index posts by checkTick")
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if s.indexPosts, err = s.ips.IndexPosts(nil, 0, s.maxIndexSize); err == nil {
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s.atomicIndex.Store(s.indexPosts)
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} else {
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logrus.Errorf("get index posts err: %v", err)
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}
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}
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case <-s.expireIndexTick.C:
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logrus.Debugf("expire index posts by expireIndexTick")
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if s.indexPosts != nil {
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s.indexPosts = nil
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s.atomicIndex.Store(s.indexPosts)
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}
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case action := <-s.indexActionCh:
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switch action {
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// TODO: 这里列出来是因为后续可能会精细化处理每种情况
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case core.IdxActCreatePost,
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core.IdxActUpdatePost,
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core.IdxActDeletePost,
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core.IdxActStickPost,
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core.IdxActVisiblePost:
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// prevent many update post in least time
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if s.indexPosts != nil {
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logrus.Debugf("remove index posts by action %s", action)
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s.indexPosts = nil
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s.atomicIndex.Store(s.indexPosts)
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}
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default:
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// nop
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}
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}
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}
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}
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func (s *simpleCacheIndexServant) Name() string {
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return "SimpleCacheIndex"
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}
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func (s *simpleCacheIndexServant) Version() *semver.Version {
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return semver.MustParse("v0.1.0")
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}
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