gotosocial/internal/processing/timeline/postindex.go

48 lines
1.0 KiB
Go
Raw Normal View History

2021-06-02 17:52:15 +00:00
package timeline
import (
"container/list"
"errors"
"time"
)
type postIndex struct {
data *list.List
}
type postIndexEntry struct {
createdAt time.Time
statusID string
}
func (p *postIndex) index(i *postIndexEntry) error {
if p.data == nil {
p.data = &list.List{}
}
// if we have no entries yet, this is both the newest and oldest entry, so just put it in the front
if p.data.Len() == 0 {
p.data.PushFront(i)
return nil
}
// we need to iterate through the index to make sure we put this post in the appropriate place according to when it was created
for e := p.data.Front(); e != nil; e = e.Next() {
entry, ok := e.Value.(*postIndexEntry)
if !ok {
return errors.New("Remove: could not parse e as a postIndexEntry")
}
// if the post to index is newer than e, insert it before e in the list
if i.createdAt.After(entry.createdAt) {
p.data.InsertBefore(i, e)
return nil
}
}
// if we reach this point it's the oldest post we've seen so put it at the back
p.data.PushBack(i)
return nil
}