gotosocial/internal/timeline/prepare.go

140 lines
3.8 KiB
Go

// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package timeline
import (
"container/list"
"context"
"errors"
"codeberg.org/gruf/go-kv"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/gtserror"
"github.com/superseriousbusiness/gotosocial/internal/log"
)
func (t *timeline) prepareXBetweenIDs(ctx context.Context, amount int, behindID string, beforeID string, frontToBack bool) error {
l := log.
WithContext(ctx).
WithFields(kv.Fields{
{"amount", amount},
{"behindID", behindID},
{"beforeID", beforeID},
{"frontToBack", frontToBack},
}...)
l.Trace("entering prepareXBetweenIDs")
if beforeID >= behindID {
// This is an impossible situation, we
// can't prepare anything between these.
return nil
}
if err := t.indexXBetweenIDs(ctx, amount, behindID, beforeID, frontToBack); err != nil {
// An error here doesn't necessarily mean we
// can't prepare anything, so log + keep going.
l.Debugf("error calling prepareXBetweenIDs: %s", err)
}
t.Lock()
defer t.Unlock()
// Try to prepare everything between (and including) the two points.
var (
toPrepare = make(map[*list.Element]*indexedItemsEntry)
foundToPrepare int
)
if frontToBack {
// Paging forwards / down.
for e := t.items.data.Front(); e != nil; e = e.Next() {
entry := e.Value.(*indexedItemsEntry) //nolint:forcetypeassert
if entry.itemID > behindID {
l.Trace("item is too new, continuing")
continue
}
if entry.itemID < beforeID {
// We've gone beyond the bounds of
// items we're interested in; stop.
l.Trace("reached older items, breaking")
break
}
// Only prepare entry if it's not
// already prepared, save db calls.
if entry.prepared == nil {
toPrepare[e] = entry
}
foundToPrepare++
if foundToPrepare >= amount {
break
}
}
} else {
// Paging backwards / up.
for e := t.items.data.Back(); e != nil; e = e.Prev() {
entry := e.Value.(*indexedItemsEntry) //nolint:forcetypeassert
if entry.itemID < beforeID {
l.Trace("item is too old, continuing")
continue
}
if entry.itemID > behindID {
// We've gone beyond the bounds of
// items we're interested in; stop.
l.Trace("reached newer items, breaking")
break
}
if entry.prepared == nil {
toPrepare[e] = entry
}
// Only prepare entry if it's not
// already prepared, save db calls.
foundToPrepare++
if foundToPrepare >= amount {
break
}
}
}
for e, entry := range toPrepare {
prepared, err := t.prepareFunction(ctx, t.timelineID, entry.itemID)
if err != nil {
if errors.Is(err, db.ErrNoEntries) {
// ErrNoEntries means something has been deleted,
// so we'll likely not be able to ever prepare this.
// This means we can remove it and skip past it.
l.Debugf("db.ErrNoEntries while trying to prepare %s; will remove from timeline", entry.itemID)
t.items.data.Remove(e)
continue
}
// We've got a proper db error.
return gtserror.Newf("db error while trying to prepare %s: %w", entry.itemID, err)
}
entry.prepared = prepared
}
return nil
}