mirror of
https://github.com/superseriousbusiness/gotosocial.git
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92 lines
2.6 KiB
Go
92 lines
2.6 KiB
Go
/*
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GoToSocial
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Copyright (C) 2021-2023 GoToSocial Authors admin@gotosocial.org
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package timeline
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import (
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"container/list"
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"context"
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"errors"
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)
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type preparedItems struct {
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data *list.List
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skipInsert SkipInsertFunction
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}
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type preparedItemsEntry struct {
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itemID string
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boostOfID string
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accountID string
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boostOfAccountID string
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prepared Preparable
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}
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func (p *preparedItems) insertPrepared(ctx context.Context, newEntry *preparedItemsEntry) error {
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if p.data == nil {
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p.data = &list.List{}
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}
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// if we have no entries yet, this is both the newest and oldest entry, so just put it in the front
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if p.data.Len() == 0 {
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p.data.PushFront(newEntry)
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return nil
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}
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var insertMark *list.Element
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var position int
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// We need to iterate through the index to make sure we put this entry in the appropriate place according to when it was created.
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// We also need to make sure we're not inserting a duplicate entry -- this can happen sometimes and it's not nice UX (*shudder*).
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for e := p.data.Front(); e != nil; e = e.Next() {
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position++
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entry, ok := e.Value.(*preparedItemsEntry)
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if !ok {
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return errors.New("insertPrepared: could not parse e as a preparedItemsEntry")
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}
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skip, err := p.skipInsert(ctx, newEntry.itemID, newEntry.accountID, newEntry.boostOfID, newEntry.boostOfAccountID, entry.itemID, entry.accountID, entry.boostOfID, entry.boostOfAccountID, position)
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if err != nil {
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return err
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}
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if skip {
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return nil
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}
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// if the entry to index is newer than e, insert it before e in the list
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if insertMark == nil {
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if newEntry.itemID > entry.itemID {
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insertMark = e
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}
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}
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// make sure we don't insert a duplicate
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if entry.itemID == newEntry.itemID {
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return nil
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}
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}
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if insertMark != nil {
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p.data.InsertBefore(newEntry, insertMark)
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return nil
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}
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// if we reach this point it's the oldest entry we've seen so put it at the back
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p.data.PushBack(newEntry)
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return nil
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}
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