gotosocial/internal/timeline/index.go

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/*
GoToSocial
Copyright (C) 2021 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"
"time"
"github.com/sirupsen/logrus"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
)
func (t *timeline) IndexBefore(ctx context.Context, statusID string, include bool, amount int) error {
// lazily initialize index if it hasn't been done already
if t.postIndex.data == nil {
t.postIndex.data = &list.List{}
t.postIndex.data.Init()
}
filtered := []*gtsmodel.Status{}
offsetStatus := statusID
if include {
// if we have the status with given statusID in the database, include it in the results set as well
s := &gtsmodel.Status{}
if err := t.db.GetByID(ctx, statusID, s); err == nil {
filtered = append(filtered, s)
}
}
i := 0
grabloop:
for ; len(filtered) < amount && i < 5; i = i + 1 { // try the grabloop 5 times only
statuses, err := t.db.GetHomeTimeline(ctx, t.accountID, "", "", offsetStatus, amount, false)
if err != nil {
if err == db.ErrNoEntries {
break grabloop // we just don't have enough statuses left in the db so index what we've got and then bail
}
return fmt.Errorf("IndexBefore: error getting statuses from db: %s", err)
}
for _, s := range statuses {
timelineable, err := t.filter.StatusHometimelineable(ctx, s, t.account)
if err != nil {
continue
}
if timelineable {
filtered = append(filtered, s)
}
offsetStatus = s.ID
}
}
for _, s := range filtered {
if _, err := t.IndexOne(ctx, s.CreatedAt, s.ID, s.BoostOfID, s.AccountID, s.BoostOfAccountID); err != nil {
return fmt.Errorf("IndexBefore: error indexing status with id %s: %s", s.ID, err)
}
}
return nil
}
func (t *timeline) IndexBehind(ctx context.Context, statusID string, include bool, amount int) error {
l := t.log.WithFields(logrus.Fields{
"func": "IndexBehind",
"include": include,
"amount": amount,
})
// lazily initialize index if it hasn't been done already
if t.postIndex.data == nil {
t.postIndex.data = &list.List{}
t.postIndex.data.Init()
}
// If we're already indexedBehind given statusID by the required amount, we can return nil.
// First find position of statusID (or as near as possible).
var position int
positionLoop:
for e := t.postIndex.data.Front(); e != nil; e = e.Next() {
entry, ok := e.Value.(*postIndexEntry)
if !ok {
return errors.New("IndexBehind: could not parse e as a postIndexEntry")
}
if entry.statusID <= statusID {
// we've found it
break positionLoop
}
position++
}
// now check if the length of indexed posts exceeds the amount of posts required (position of statusID, plus amount of posts requested after that)
if t.postIndex.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 posts indexed")
return nil
}
filtered := []*gtsmodel.Status{}
offsetStatus := statusID
if include {
// if we have the status with given statusID in the database, include it in the results set as well
s := &gtsmodel.Status{}
if err := t.db.GetByID(ctx, statusID, s); err == nil {
filtered = append(filtered, s)
}
}
i := 0
grabloop:
for ; len(filtered) < amount && i < 5; i = i + 1 { // try the grabloop 5 times only
l.Tracef("entering grabloop; i is %d; len(filtered) is %d", i, len(filtered))
statuses, err := t.db.GetHomeTimeline(ctx, t.accountID, offsetStatus, "", "", amount, false)
if err != nil {
if err == db.ErrNoEntries {
break grabloop // we just don't have enough statuses left in the db so index what we've got and then bail
}
return fmt.Errorf("IndexBehind: error getting statuses from db: %s", err)
}
l.Tracef("got %d statuses", len(statuses))
for _, s := range statuses {
timelineable, err := t.filter.StatusHometimelineable(ctx, s, t.account)
if err != nil {
l.Tracef("status was not hometimelineable: %s", err)
continue
}
if timelineable {
filtered = append(filtered, s)
}
offsetStatus = s.ID
}
}
l.Trace("left grabloop")
for _, s := range filtered {
if _, err := t.IndexOne(ctx, s.CreatedAt, s.ID, s.BoostOfID, s.AccountID, s.BoostOfAccountID); err != nil {
return fmt.Errorf("IndexBehind: error indexing status with id %s: %s", s.ID, err)
}
}
l.Trace("exiting function")
return nil
}
func (t *timeline) IndexOne(ctx context.Context, statusCreatedAt time.Time, statusID string, boostOfID string, accountID string, boostOfAccountID string) (bool, error) {
t.Lock()
defer t.Unlock()
postIndexEntry := &postIndexEntry{
statusID: statusID,
boostOfID: boostOfID,
accountID: accountID,
boostOfAccountID: boostOfAccountID,
}
return t.postIndex.insertIndexed(postIndexEntry)
}
func (t *timeline) IndexAndPrepareOne(ctx context.Context, statusCreatedAt time.Time, statusID string, boostOfID string, accountID string, boostOfAccountID string) (bool, error) {
t.Lock()
defer t.Unlock()
postIndexEntry := &postIndexEntry{
statusID: statusID,
boostOfID: boostOfID,
accountID: accountID,
boostOfAccountID: boostOfAccountID,
}
inserted, err := t.postIndex.insertIndexed(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) OldestIndexedPostID(ctx context.Context) (string, error) {
var id string
if t.postIndex == nil || t.postIndex.data == nil || t.postIndex.data.Back() == nil {
// return an empty string if postindex hasn't been initialized yet
return id, nil
}
e := t.postIndex.data.Back()
entry, ok := e.Value.(*postIndexEntry)
if !ok {
return id, errors.New("OldestIndexedPostID: could not parse e as a postIndexEntry")
}
return entry.statusID, nil
}
func (t *timeline) NewestIndexedPostID(ctx context.Context) (string, error) {
var id string
if t.postIndex == nil || t.postIndex.data == nil || t.postIndex.data.Front() == nil {
// return an empty string if postindex hasn't been initialized yet
return id, nil
}
e := t.postIndex.data.Front()
entry, ok := e.Value.(*postIndexEntry)
if !ok {
return id, errors.New("NewestIndexedPostID: could not parse e as a postIndexEntry")
}
return entry.statusID, nil
}