gotosocial/internal/timeline/prepare.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"
"github.com/sirupsen/logrus"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
)
func (t *timeline) prepareNextQuery(ctx context.Context, amount int, maxID string, sinceID string, minID string) error {
l := t.log.WithFields(logrus.Fields{
"func": "prepareNextQuery",
"amount": amount,
"maxID": maxID,
"sinceID": sinceID,
"minID": minID,
})
var err error
// maxID is defined but sinceID isn't so take from behind
if maxID != "" && sinceID == "" {
l.Debug("preparing behind maxID")
err = t.PrepareBehind(ctx, maxID, amount)
}
// maxID isn't defined, but sinceID || minID are, so take x before
if maxID == "" && sinceID != "" {
l.Debug("preparing before sinceID")
err = t.PrepareBefore(ctx, sinceID, false, amount)
}
if maxID == "" && minID != "" {
l.Debug("preparing before minID")
err = t.PrepareBefore(ctx, minID, false, amount)
}
return err
}
func (t *timeline) PrepareBehind(ctx context.Context, statusID string, amount int) error {
// lazily initialize prepared posts if it hasn't been done already
if t.preparedPosts.data == nil {
t.preparedPosts.data = &list.List{}
t.preparedPosts.data.Init()
}
if err := t.IndexBehind(ctx, statusID, true, amount); err != nil {
return fmt.Errorf("PrepareBehind: error indexing behind id %s: %s", statusID, err)
}
// if the postindex is nil, nothing has been indexed yet so there's nothing to prepare
if t.postIndex.data == nil {
return nil
}
var prepared int
var preparing bool
t.Lock()
defer t.Unlock()
prepareloop:
for e := t.postIndex.data.Front(); e != nil; e = e.Next() {
entry, ok := e.Value.(*postIndexEntry)
if !ok {
return errors.New("PrepareBehind: could not parse e as a postIndexEntry")
}
if !preparing {
// we haven't hit the position we need to prepare from yet
if entry.statusID == statusID {
preparing = true
}
}
if preparing {
if err := t.prepare(ctx, entry.statusID); err != nil {
// there's been an error
if err != db.ErrNoEntries {
// it's a real error
return fmt.Errorf("PrepareBehind: error preparing status with id %s: %s", entry.statusID, err)
}
// the status just doesn't exist (anymore) so continue to the next one
continue
}
if prepared == amount {
// we're done
break prepareloop
}
prepared = prepared + 1
}
}
return nil
}
func (t *timeline) PrepareBefore(ctx context.Context, statusID string, include bool, amount int) error {
t.Lock()
defer t.Unlock()
// lazily initialize prepared posts if it hasn't been done already
if t.preparedPosts.data == nil {
t.preparedPosts.data = &list.List{}
t.preparedPosts.data.Init()
}
// if the postindex is nil, nothing has been indexed yet so there's nothing to prepare
if t.postIndex.data == nil {
return nil
}
var prepared int
var preparing bool
prepareloop:
for e := t.postIndex.data.Back(); e != nil; e = e.Prev() {
entry, ok := e.Value.(*postIndexEntry)
if !ok {
return errors.New("PrepareBefore: could not parse e as a postIndexEntry")
}
if !preparing {
// we haven't hit the position we need to prepare from yet
if entry.statusID == statusID {
preparing = true
if !include {
continue
}
}
}
if preparing {
if err := t.prepare(ctx, entry.statusID); err != nil {
// there's been an error
if err != db.ErrNoEntries {
// it's a real error
return fmt.Errorf("PrepareBefore: error preparing status with id %s: %s", entry.statusID, err)
}
// the status just doesn't exist (anymore) so continue to the next one
continue
}
if prepared == amount {
// we're done
break prepareloop
}
prepared = prepared + 1
}
}
return nil
}
func (t *timeline) PrepareFromTop(ctx context.Context, amount int) error {
l := t.log.WithFields(logrus.Fields{
"func": "PrepareFromTop",
"amount": amount,
})
// lazily initialize prepared posts if it hasn't been done already
if t.preparedPosts.data == nil {
t.preparedPosts.data = &list.List{}
t.preparedPosts.data.Init()
}
// if the postindex is nil, nothing has been indexed yet so index from the highest ID possible
if t.postIndex.data == nil {
l.Debug("postindex.data was nil, indexing behind highest possible ID")
if err := t.IndexBehind(ctx, "ZZZZZZZZZZZZZZZZZZZZZZZZZZ", false, amount); err != nil {
return fmt.Errorf("PrepareFromTop: error indexing behind id %s: %s", "ZZZZZZZZZZZZZZZZZZZZZZZZZZ", err)
}
}
l.Trace("entering prepareloop")
t.Lock()
defer t.Unlock()
var prepared int
prepareloop:
for e := t.postIndex.data.Front(); e != nil; e = e.Next() {
if e == nil {
continue
}
entry, ok := e.Value.(*postIndexEntry)
if !ok {
return errors.New("PrepareFromTop: could not parse e as a postIndexEntry")
}
if err := t.prepare(ctx, entry.statusID); err != nil {
// there's been an error
if err != db.ErrNoEntries {
// it's a real error
return fmt.Errorf("PrepareFromTop: error preparing status with id %s: %s", entry.statusID, err)
}
// the status just doesn't exist (anymore) so continue to the next one
continue
}
prepared = prepared + 1
if prepared == amount {
// we're done
l.Trace("leaving prepareloop")
break prepareloop
}
}
l.Trace("leaving function")
return nil
}
func (t *timeline) prepare(ctx context.Context, statusID string) error {
// start by getting the status out of the database according to its indexed ID
gtsStatus := &gtsmodel.Status{}
if err := t.db.GetByID(ctx, statusID, gtsStatus); err != nil {
return err
}
// if the account pointer hasn't been set on this timeline already, set it lazily here
if t.account == nil {
timelineOwnerAccount := &gtsmodel.Account{}
if err := t.db.GetByID(ctx, t.accountID, timelineOwnerAccount); err != nil {
return err
}
t.account = timelineOwnerAccount
}
// serialize the status (or, at least, convert it to a form that's ready to be serialized)
apiModelStatus, err := t.tc.StatusToAPIStatus(ctx, gtsStatus, t.account)
if err != nil {
return err
}
// shove it in prepared posts as a prepared posts entry
preparedPostsEntry := &preparedPostsEntry{
statusID: gtsStatus.ID,
boostOfID: gtsStatus.BoostOfID,
accountID: gtsStatus.AccountID,
boostOfAccountID: gtsStatus.BoostOfAccountID,
prepared: apiModelStatus,
}
return t.preparedPosts.insertPrepared(preparedPostsEntry)
}
func (t *timeline) OldestPreparedPostID(ctx context.Context) (string, error) {
var id string
if t.preparedPosts == nil || t.preparedPosts.data == nil {
// return an empty string if prepared posts hasn't been initialized yet
return id, nil
}
e := t.preparedPosts.data.Back()
if e == nil {
// return an empty string if there's no back entry (ie., the index list hasn't been initialized yet)
return id, nil
}
entry, ok := e.Value.(*preparedPostsEntry)
if !ok {
return id, errors.New("OldestPreparedPostID: could not parse e as a preparedPostsEntry")
}
return entry.statusID, nil
}