gotosocial/internal/timeline/prepare.go
Tobi Smethurst efbd839181
Testrig fixes (#50)
* testrig is runnable again
* little fixes, add some more test models
* address https://github.com/superseriousbusiness/gotosocial/issues/44
2021-06-21 12:27:23 +02:00

236 lines
5.8 KiB
Go

package timeline
import (
"container/list"
"errors"
"fmt"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
)
func (t *timeline) prepareNextQuery(amount int, maxID string, sinceID string, minID string) error {
var err error
// maxID is defined but sinceID isn't so take from behind
if maxID != "" && sinceID == "" {
err = t.PrepareBehind(maxID, amount)
}
// maxID isn't defined, but sinceID || minID are, so take x before
if maxID == "" && sinceID != "" {
err = t.PrepareBefore(sinceID, false, amount)
}
if maxID == "" && minID != "" {
err = t.PrepareBefore(minID, false, amount)
}
return err
}
func (t *timeline) PrepareBehind(statusID string, 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.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(entry.statusID); err != nil {
// there's been an error
if _, ok := err.(db.ErrNoEntries); !ok {
// 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(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(entry.statusID); err != nil {
// there's been an error
if _, ok := err.(db.ErrNoEntries); !ok {
// 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(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
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(entry.statusID); err != nil {
// there's been an error
if _, ok := err.(db.ErrNoEntries); !ok {
// 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
break prepareloop
}
}
return nil
}
func (t *timeline) prepare(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(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(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.StatusToMasto(gtsStatus, t.account)
if err != nil {
return err
}
// shove it in prepared posts as a prepared posts entry
preparedPostsEntry := &preparedPostsEntry{
statusID: statusID,
prepared: apiModelStatus,
}
return t.preparedPosts.insertPrepared(preparedPostsEntry)
}
func (t *timeline) OldestPreparedPostID() (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
}