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/*
GoToSocial
Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
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"
"fmt"
"codeberg.org/gruf/go-kv"
"github.com/superseriousbusiness/gotosocial/internal/log"
)
func (t *timeline) ItemIndexLength(ctx context.Context) int {
if t.indexedItems == nil || t.indexedItems.data == nil {
return 0
}
return t.indexedItems.data.Len()
}
// func (t *timeline) indexBefore(ctx context.Context, itemID string, amount int) error {
// l := log.WithFields(kv.Fields{{"amount", amount}}...)
// // lazily initialize index if it hasn't been done already
// if t.indexedItems.data == nil {
// t.indexedItems.data = &list.List{}
// t.indexedItems.data.Init()
// }
// toIndex := []Timelineable{}
// offsetID := itemID
// l.Trace("entering grabloop")
// grabloop:
// for i := 0; len(toIndex) < amount && i < 5; i++ { // try the grabloop 5 times only
// // first grab items using the caller-provided grab function
// l.Trace("grabbing...")
// items, stop, err := t.grabFunction(ctx, t.accountID, "", "", offsetID, amount)
// if err != nil {
// return err
// }
// if stop {
// break grabloop
// }
// l.Trace("filtering...")
// // now filter each item using the caller-provided filter function
// for _, item := range items {
// shouldIndex, err := t.filterFunction(ctx, t.accountID, item)
// if err != nil {
// return err
// }
// if shouldIndex {
// toIndex = append(toIndex, item)
// }
// offsetID = item.GetID()
// }
// }
// l.Trace("left grabloop")
// // index the items we got
// for _, s := range toIndex {
// if _, err := t.IndexOne(ctx, s.GetID(), s.GetBoostOfID(), s.GetAccountID(), s.GetBoostOfAccountID()); err != nil {
// return fmt.Errorf("indexBefore: error indexing item with id %s: %s", s.GetID(), err)
// }
// }
// return nil
// }
func (t *timeline) indexBehind(ctx context.Context, itemID string, amount int) error {
l := log.WithFields(kv.Fields{{"amount", amount}}...)
// lazily initialize index if it hasn't been done already
if t.indexedItems.data == nil {
t.indexedItems.data = &list.List{}
t.indexedItems.data.Init()
}
// If we're already indexedBehind given itemID by the required amount, we can return nil.
// First find position of itemID (or as near as possible).
var position int
positionLoop:
for e := t.indexedItems.data.Front(); e != nil; e = e.Next() {
entry, ok := e.Value.(*indexedItemsEntry)
if !ok {
return errors.New("indexBehind: could not parse e as an itemIndexEntry")
}
if entry.itemID <= itemID {
// we've found it
break positionLoop
}
position++
}
// now check if the length of indexed items exceeds the amount of items required (position of itemID, plus amount of posts requested after that)
if t.indexedItems.data.Len() > position+amount {
// we have enough indexed behind already to satisfy amount, so don't need to make db calls
l.Trace("returning nil since we already have enough items indexed")
return nil
}
toIndex := []Timelineable{}
offsetID := itemID
l.Trace("entering grabloop")
grabloop:
for i := 0; len(toIndex) < amount && i < 5; i++ { // try the grabloop 5 times only
// first grab items using the caller-provided grab function
l.Trace("grabbing...")
items, stop, err := t.grabFunction(ctx, t.accountID, offsetID, "", "", amount)
if err != nil {
return err
}
if stop {
break grabloop
}
l.Trace("filtering...")
// now filter each item using the caller-provided filter function
for _, item := range items {
shouldIndex, err := t.filterFunction(ctx, t.accountID, item)
if err != nil {
return err
}
if shouldIndex {
toIndex = append(toIndex, item)
}
offsetID = item.GetID()
}
}
l.Trace("left grabloop")
// index the items we got
for _, s := range toIndex {
if _, err := t.IndexOne(ctx, s.GetID(), s.GetBoostOfID(), s.GetAccountID(), s.GetBoostOfAccountID()); err != nil {
return fmt.Errorf("indexBehind: error indexing item with id %s: %s", s.GetID(), err)
}
}
return nil
}
func (t *timeline) IndexOne(ctx context.Context, itemID string, boostOfID string, accountID string, boostOfAccountID string) (bool, error) {
t.Lock()
defer t.Unlock()
postIndexEntry := &indexedItemsEntry{
itemID: itemID,
boostOfID: boostOfID,
accountID: accountID,
boostOfAccountID: boostOfAccountID,
}
return t.indexedItems.insertIndexed(ctx, postIndexEntry)
}
func (t *timeline) IndexAndPrepareOne(ctx context.Context, statusID string, boostOfID string, accountID string, boostOfAccountID string) (bool, error) {
t.Lock()
defer t.Unlock()
postIndexEntry := &indexedItemsEntry{
itemID: statusID,
boostOfID: boostOfID,
accountID: accountID,
boostOfAccountID: boostOfAccountID,
}
inserted, err := t.indexedItems.insertIndexed(ctx, postIndexEntry)
if err != nil {
return inserted, fmt.Errorf("IndexAndPrepareOne: error inserting indexed: %s", err)
}
if inserted {
if err := t.prepare(ctx, statusID); err != nil {
return inserted, fmt.Errorf("IndexAndPrepareOne: error preparing: %s", err)
}
}
return inserted, nil
}
func (t *timeline) OldestIndexedItemID(ctx context.Context) (string, error) {
var id string
if t.indexedItems == nil || t.indexedItems.data == nil || t.indexedItems.data.Back() == nil {
// return an empty string if postindex hasn't been initialized yet
return id, nil
}
e := t.indexedItems.data.Back()
entry, ok := e.Value.(*indexedItemsEntry)
if !ok {
return id, errors.New("OldestIndexedItemID: could not parse e as itemIndexEntry")
}
return entry.itemID, nil
}
func (t *timeline) NewestIndexedItemID(ctx context.Context) (string, error) {
var id string
if t.indexedItems == nil || t.indexedItems.data == nil || t.indexedItems.data.Front() == nil {
// return an empty string if postindex hasn't been initialized yet
return id, nil
}
e := t.indexedItems.data.Front()
entry, ok := e.Value.(*indexedItemsEntry)
if !ok {
return id, errors.New("NewestIndexedItemID: could not parse e as itemIndexEntry")
}
return entry.itemID, nil
}
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