mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-02 21:36:36 +00:00
139 lines
3.8 KiB
Go
139 lines
3.8 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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"errors"
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"codeberg.org/gruf/go-kv"
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"github.com/superseriousbusiness/gotosocial/internal/db"
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"github.com/superseriousbusiness/gotosocial/internal/gtserror"
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"github.com/superseriousbusiness/gotosocial/internal/log"
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)
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func (t *timeline) prepareXBetweenIDs(ctx context.Context, amount int, behindID string, beforeID string, frontToBack bool) error {
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l := log.
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WithContext(ctx).
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WithFields(kv.Fields{
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{"amount", amount},
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{"behindID", behindID},
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{"beforeID", beforeID},
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{"frontToBack", frontToBack},
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}...)
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l.Trace("entering prepareXBetweenIDs")
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if beforeID >= behindID {
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// This is an impossible situation, we
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// can't prepare anything between these.
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return nil
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}
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if err := t.indexXBetweenIDs(ctx, amount, behindID, beforeID, frontToBack); err != nil {
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// An error here doesn't necessarily mean we
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// can't prepare anything, so log + keep going.
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l.Debugf("error calling prepareXBetweenIDs: %s", err)
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}
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t.Lock()
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defer t.Unlock()
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// Try to prepare everything between (and including) the two points.
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var (
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toPrepare = make(map[*list.Element]*indexedItemsEntry)
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foundToPrepare int
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)
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if frontToBack {
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// Paging forwards / down.
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for e := t.items.data.Front(); e != nil; e = e.Next() {
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entry := e.Value.(*indexedItemsEntry)
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if entry.itemID > behindID {
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l.Trace("item is too new, continuing")
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continue
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}
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if entry.itemID < beforeID {
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// We've gone beyond the bounds of
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// items we're interested in; stop.
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l.Trace("reached older items, breaking")
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break
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}
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// Only prepare entry if it's not
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// already prepared, save db calls.
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if entry.prepared == nil {
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toPrepare[e] = entry
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}
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foundToPrepare++
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if foundToPrepare >= amount {
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break
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}
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}
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} else {
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// Paging backwards / up.
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for e := t.items.data.Back(); e != nil; e = e.Prev() {
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entry := e.Value.(*indexedItemsEntry)
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if entry.itemID < beforeID {
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l.Trace("item is too old, continuing")
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continue
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}
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if entry.itemID > behindID {
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// We've gone beyond the bounds of
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// items we're interested in; stop.
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l.Trace("reached newer items, breaking")
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break
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}
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if entry.prepared == nil {
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toPrepare[e] = entry
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}
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// Only prepare entry if it's not
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// already prepared, save db calls.
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foundToPrepare++
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if foundToPrepare >= amount {
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break
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}
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}
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}
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for e, entry := range toPrepare {
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prepared, err := t.prepareFunction(ctx, t.timelineID, entry.itemID)
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if err != nil {
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if errors.Is(err, db.ErrNoEntries) {
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// ErrNoEntries means something has been deleted,
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// so we'll likely not be able to ever prepare this.
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// This means we can remove it and skip past it.
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l.Debugf("db.ErrNoEntries while trying to prepare %s; will remove from timeline", entry.itemID)
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t.items.data.Remove(e)
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continue
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}
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// We've got a proper db error.
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return gtserror.Newf("db error while trying to prepare %s: %w", entry.itemID, err)
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}
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entry.prepared = prepared
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}
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return nil
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}
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