go-common/app/admin/main/reply/service/fold.go

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2019-04-22 10:49:16 +00:00
package service
import (
"context"
"sync"
"time"
"go-common/app/admin/main/reply/model"
"go-common/library/database/sql"
"go-common/library/ecode"
"go-common/library/sync/errgroup.v2"
)
func compose(oids, tps, rpIDs []int64) (rpMap map[int64][]int64, tpMap map[int64]int64) {
if len(oids) != len(rpIDs) {
return
}
rpMap = make(map[int64][]int64)
tpMap = make(map[int64]int64)
for i, oid := range oids {
if _, ok := rpMap[oid]; ok {
rpMap[oid] = append(rpMap[oid], rpIDs[i])
} else {
rpMap[oid] = []int64{rpIDs[i]}
}
tpMap[oid] = tps[i]
}
return
}
func extend(oid int64, length int) []int64 {
oids := make([]int64, 0, length)
for i := 0; i < length; i++ {
oids = append(oids, oid)
}
return oids
}
// FoldReplies ...
func (s *Service) FoldReplies(ctx context.Context, oids, tps, rpIDs []int64) (err error) {
g := errgroup.WithContext(ctx)
g.GOMAXPROCS(2)
rpMap, tpMap := compose(oids, tps, rpIDs)
for oid, IDs := range rpMap {
if tp, ok := tpMap[oid]; ok {
oid, tp, IDs := oid, tp, IDs
g.Go(func(ctx context.Context) error {
return s.foldReplies(ctx, oid, tp, IDs)
})
}
}
return g.Wait()
}
func (s *Service) foldReplies(ctx context.Context, oid, tp int64, rpIDs []int64) (err error) {
var (
sub *model.Subject
// 所有的评论,包含需要被折叠的子评论的根评论
rpMap = make(map[int64]*model.Reply)
// 需要被折叠的子评论的根评论IDs
roots []int64
rootMap map[int64]*model.Reply
// 应该被折叠的评论map
rps = make(map[int64]*model.Reply)
mu sync.Mutex
)
if sub, err = s.subject(ctx, oid, int32(tp)); err != nil {
return
}
if rpMap, err = s.dao.Replies(ctx, extend(oid, len(rpIDs)), rpIDs); err != nil {
return
}
for _, rp := range rpMap {
if !rp.IsRoot() {
roots = append(roots, rp.Root)
}
rps[rp.ID] = rp
}
if len(roots) > 0 {
if rootMap, err = s.dao.Replies(ctx, extend(oid, len(roots)), roots); err != nil {
return
}
for _, root := range rootMap {
rpMap[root.ID] = root
}
}
g := errgroup.WithContext(ctx)
g.GOMAXPROCS(4)
for rpID := range rps {
rpID := rpID
g.Go(func(ctx context.Context) error {
if err := s.tranFoldReply(ctx, sub.Oid, rpID); err != nil {
mu.Lock()
delete(rps, rpID)
mu.Unlock()
return err
}
return nil
})
}
err = g.Wait()
for _, rp := range rps {
// 这里不是删除是为了让reply-feed去掉热评, 折叠评论是可以有互动行为的, 所以这里异步,丢了也无所谓
rp := rp
s.cache.Do(ctx, func(ctx context.Context) {
s.pubEvent(ctx, "reply_del", 0, sub, rp, nil)
})
}
// 标记数据库有折叠评论, rpMap 是所有的被折叠评论以及他们的根评论
s.markHasFolded(ctx, rps, rpMap, sub)
s.handleCacheByFold(ctx, rps, rpMap, sub)
return err
}
// handleCacheByFold ...
func (s *Service) handleCacheByFold(ctx context.Context, rps map[int64]*model.Reply, rpMap map[int64]*model.Reply, sub *model.Subject) {
var (
roots []int64
childMap = make(map[int64][]int64)
)
for _, rp := range rps {
if rp.IsRoot() {
roots = append(roots, rp.ID)
} else {
childMap[rp.Root] = append(childMap[rp.Root], rp.ID)
}
}
s.cacheOperater.Do(ctx, func(ctx context.Context) {
// 删正常列表的redis缓存
s.dao.RemRdsByFold(ctx, roots, childMap, sub, rpMap)
// 加折叠列表redis缓存
s.dao.AddRdsByFold(ctx, roots, childMap, sub, rpMap)
})
}
// markAsFolded ...
func (s *Service) markHasFolded(ctx context.Context, foldedRp map[int64]*model.Reply, rpMap map[int64]*model.Reply, sub *model.Subject) {
var (
dirtyCacheRpIDs []int64
markedRpIDs []int64
)
for _, rp := range foldedRp {
rp := rp
if rp.IsRoot() {
// 如果subject还没被标记过
if !sub.HasFolded() {
sub.MarkHasFolded()
// 修改数据库标记
s.marker.Do(ctx, func(ctx context.Context) {
if err := s.tranMarkSubHasFolded(ctx, sub.Oid, sub.Type); err != nil {
return
}
})
// 删掉 subject mc
s.cacheOperater.Do(ctx, func(ctx context.Context) {
s.dao.DelSubjectCache(ctx, sub.Oid, sub.Type)
})
}
} else {
if _, ok := rpMap[rp.Root]; ok {
markedRpIDs = append(markedRpIDs, rp.Root)
}
}
dirtyCacheRpIDs = append(dirtyCacheRpIDs, rp.ID)
}
for _, rpID := range markedRpIDs {
// 修改数据库标记
rpID := rpID
s.marker.Do(ctx, func(ctx context.Context) {
if err := s.tranMarkReplyHasFolded(ctx, sub.Oid, rpID); err != nil {
return
}
})
}
dirtyCacheRpIDs = append(dirtyCacheRpIDs, markedRpIDs...)
for _, rpID := range dirtyCacheRpIDs {
// 删除被折叠子评论的根评论以及被折叠的子评论和根评论
rpID := rpID
s.cacheOperater.Do(ctx, func(ctx context.Context) {
s.dao.DelReplyCache(ctx, rpID)
})
}
}
func (s *Service) tranFoldReply(ctx context.Context, oid, rpID int64) (err error) {
var (
tx *sql.Tx
rp *model.Reply
)
if tx, err = s.dao.BeginTran(ctx); err != nil {
return
}
if rp, err = s.dao.TxReplyForUpdate(tx, oid, rpID); err != nil {
tx.Rollback()
return
}
if rp.DenyFolded() {
tx.Rollback()
return ecode.ReplyForbidFolded
}
if _, err = s.dao.TxUpdateReplyState(tx, oid, rpID, model.StateFolded, time.Now()); err != nil {
tx.Rollback()
return
}
return tx.Commit()
}
func (s *Service) tranMarkReplyHasFolded(ctx context.Context, oid, rpID int64) (err error) {
var (
tx *sql.Tx
rp *model.Reply
)
if tx, err = s.dao.BeginTran(ctx); err != nil {
return
}
if rp, err = s.dao.TxReplyForUpdate(tx, oid, rpID); err != nil {
tx.Rollback()
return
}
rp.MarkHasFolded()
if _, err = s.dao.TxUpReplyAttr(tx, oid, rpID, rp.Attr, time.Now()); err != nil {
tx.Rollback()
return
}
return tx.Commit()
}
func (s *Service) tranMarkSubHasFolded(ctx context.Context, oid int64, tp int32) (err error) {
var (
tx *sql.Tx
sub *model.Subject
)
if tx, err = s.dao.BeginTran(ctx); err != nil {
return
}
if sub, err = s.dao.TxSubjectForUpdate(tx, oid, tp); err != nil {
tx.Rollback()
return
}
sub.MarkHasFolded()
if _, err = s.dao.TxUpSubAttr(tx, oid, tp, sub.Attr, time.Now()); err != nil {
tx.Rollback()
return
}
return tx.Commit()
}
// handleFolded 处理折叠评论的逻辑,包括折叠评论被删除等, 状态改变之后标记改变的问题...
func (s *Service) handleFolded(ctx context.Context, rp *model.Reply) {
sub, root, err := s.handleHasFoldedMark(ctx, rp.Oid, rp.Type, rp.Root)
if err != nil {
return
}
if sub != nil {
s.dao.DelSubjectCache(ctx, sub.Oid, sub.Type)
}
if root != nil {
s.dao.DelReplyCache(ctx, root.ID)
}
s.remFoldedCache(ctx, rp)
}
func (s *Service) handleHasFoldedMark(ctx context.Context, oid int64, tp int32, root int64) (sub *model.Subject, reply *model.Reply, err error) {
var (
tx *sql.Tx
count int
)
if tx, err = s.dao.BeginTran(ctx); err != nil {
return
}
// 锁subject表
if sub, err = s.dao.TxSubjectForUpdate(tx, oid, tp); err != nil {
tx.Rollback()
return
}
if count, err = s.dao.TxCountFoldedReplies(tx, oid, tp, root); err != nil || count > 0 {
tx.Rollback()
return
}
// 折叠根评论
if root == 0 {
if !sub.HasFolded() {
tx.Rollback()
return
}
sub.UnmarkHasFolded()
if _, err = s.dao.TxUpSubAttr(tx, oid, tp, sub.Attr, time.Now()); err != nil {
tx.Rollback()
return
}
} else {
if reply, err = s.dao.TxReplyForUpdate(tx, oid, root); err != nil {
tx.Rollback()
return
}
if !reply.HasFolded() {
tx.Rollback()
return
}
reply.UnmarkHasFolded()
if _, err = s.dao.TxUpReplyAttr(tx, oid, root, reply.Attr, time.Now()); err != nil {
tx.Rollback()
return
}
}
if err = tx.Commit(); err != nil {
return
}
return
}
// remFoldedCache ...
func (s *Service) remFoldedCache(ctx context.Context, rp *model.Reply) {
if rp.IsRoot() {
s.dao.RemFolder(ctx, model.FolderKindSub, rp.Oid, rp.ID)
} else {
s.dao.RemFolder(ctx, model.FolderKindRoot, rp.Root, rp.ID)
}
}