121 lines
3.3 KiB
Go
121 lines
3.3 KiB
Go
// GoToSocial
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// Copyright (C) GoToSocial Authors admin@gotosocial.org
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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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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//
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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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//
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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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package timeline
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import (
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"container/list"
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"context"
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"github.com/superseriousbusiness/gotosocial/internal/gtserror"
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)
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type indexedItems struct {
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data *list.List
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skipInsert SkipInsertFunction
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}
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type indexedItemsEntry 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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// WARNING: ONLY CALL THIS FUNCTION IF YOU ALREADY HAVE
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// A LOCK ON THE TIMELINE CONTAINING THIS INDEXEDITEMS!
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func (i *indexedItems) insertIndexed(ctx context.Context, newEntry *indexedItemsEntry) (bool, error) {
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// Lazily init indexed items.
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if i.data == nil {
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i.data = &list.List{}
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i.data.Init()
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}
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if i.data.Len() == 0 {
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// We have no entries yet, meaning this is both the
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// newest + oldest entry, so just put it in the front.
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i.data.PushFront(newEntry)
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return true, nil
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}
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var (
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insertMark *list.Element
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currentPosition int
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)
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// We need to iterate through the index to make sure we put
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// this item in the appropriate place according to its id.
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// We also need to make sure we're not inserting a duplicate
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// item -- this can happen sometimes and it's sucky UX.
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for e := i.data.Front(); e != nil; e = e.Next() {
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currentPosition++
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currentEntry := e.Value.(*indexedItemsEntry)
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// Check if we need to skip inserting this item based on
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// the current item.
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//
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// For example, if the new item is a boost, and the current
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// item is the original, we may not want to insert the boost
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// if it would appear very shortly after the original.
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if skip, err := i.skipInsert(
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ctx,
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newEntry.itemID,
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newEntry.accountID,
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newEntry.boostOfID,
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newEntry.boostOfAccountID,
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currentEntry.itemID,
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currentEntry.accountID,
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currentEntry.boostOfID,
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currentEntry.boostOfAccountID,
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currentPosition,
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); err != nil {
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return false, gtserror.Newf("error calling skipInsert: %w", err)
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} else if skip {
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// We don't need to insert this at all,
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// so we can safely bail.
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return false, nil
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}
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if insertMark != nil {
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// We already found our mark.
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continue
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}
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if currentEntry.itemID > newEntry.itemID {
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// We're still in items newer than
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// the one we're trying to insert.
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continue
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}
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// We found our spot!
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insertMark = e
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}
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if insertMark == nil {
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// We looked through the whole timeline and didn't find
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// a mark, so the new item is the oldest item we've seen;
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// insert it at the back.
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i.data.PushBack(newEntry)
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return true, nil
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}
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i.data.InsertBefore(newEntry, insertMark)
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return true, nil
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}
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