109 lines
2.7 KiB
Go
109 lines
2.7 KiB
Go
package counters
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import (
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"database/sql"
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"sync"
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c "git.tuxpa.in/a/gosora/common"
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qgen "git.tuxpa.in/a/gosora/query_gen"
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"github.com/pkg/errors"
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)
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var ForumViewCounter *DefaultForumViewCounter
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// TODO: Unload forum counters without any views over the past 15 minutes, if the admin has configured the forumstore with a cap and it's been hit?
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// Forums can be reloaded from the database at any time, so we want to keep the counters separate from them
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type DefaultForumViewCounter struct {
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oddMap map[int]*RWMutexCounterBucket // map[fid]struct{counter,sync.RWMutex}
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evenMap map[int]*RWMutexCounterBucket
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oddLock sync.RWMutex
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evenLock sync.RWMutex
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insert *sql.Stmt
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}
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func NewDefaultForumViewCounter() (*DefaultForumViewCounter, error) {
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acc := qgen.NewAcc()
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co := &DefaultForumViewCounter{
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oddMap: make(map[int]*RWMutexCounterBucket),
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evenMap: make(map[int]*RWMutexCounterBucket),
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insert: acc.Insert("viewchunks_forums").Columns("count,createdAt,forum").Fields("?,UTC_TIMESTAMP(),?").Prepare(),
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}
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c.Tasks.FifteenMin.Add(co.Tick) // There could be a lot of routes, so we don't want to be running this every second
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//c.Tasks.Sec.Add(co.Tick)
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c.Tasks.Shutdown.Add(co.Tick)
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return co, acc.FirstError()
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}
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func (co *DefaultForumViewCounter) Tick() error {
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cLoop := func(l *sync.RWMutex, m map[int]*RWMutexCounterBucket) error {
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l.RLock()
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for fid, f := range m {
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l.RUnlock()
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var count int
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f.RLock()
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count = f.counter
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f.RUnlock()
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// TODO: Only delete the bucket when it's zero to avoid hitting popular forums?
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l.Lock()
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delete(m, fid)
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l.Unlock()
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e := co.insertChunk(count, fid)
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if e != nil {
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return errors.Wrap(errors.WithStack(e), "forum counter")
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}
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l.RLock()
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}
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l.RUnlock()
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return nil
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}
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e := cLoop(&co.oddLock, co.oddMap)
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if e != nil {
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return e
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}
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return cLoop(&co.evenLock, co.evenMap)
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}
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func (co *DefaultForumViewCounter) insertChunk(count, forum int) error {
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if count == 0 {
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return nil
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}
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c.DebugLogf("Inserting a vchunk with a count of %d for forum %d", count, forum)
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_, e := co.insert.Exec(count, forum)
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return e
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}
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func (co *DefaultForumViewCounter) Bump(fid int) {
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// Is the ID even?
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if fid%2 == 0 {
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co.evenLock.RLock()
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f, ok := co.evenMap[fid]
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co.evenLock.RUnlock()
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if ok {
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f.Lock()
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f.counter++
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f.Unlock()
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} else {
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co.evenLock.Lock()
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co.evenMap[fid] = &RWMutexCounterBucket{counter: 1}
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co.evenLock.Unlock()
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}
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return
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}
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co.oddLock.RLock()
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f, ok := co.oddMap[fid]
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co.oddLock.RUnlock()
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if ok {
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f.Lock()
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f.counter++
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f.Unlock()
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} else {
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co.oddLock.Lock()
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co.oddMap[fid] = &RWMutexCounterBucket{counter: 1}
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co.oddLock.Unlock()
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}
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}
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// TODO: Add a forum counter backed by two maps which grow as forums are created but never shrinks
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