gotosocial/internal/timeline/manager.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 (
"fmt"
"strings"
"sync"
"github.com/sirupsen/logrus"
apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
"github.com/superseriousbusiness/gotosocial/internal/config"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/typeutils"
)
const (
desiredPostIndexLength = 400
)
// Manager abstracts functions for creating timelines for multiple accounts, and adding, removing, and fetching entries from those timelines.
//
// By the time a status hits the manager interface, it should already have been filtered and it should be established that the status indeed
// belongs in the home timeline of the given account ID.
//
// The manager makes a distinction between *indexed* posts and *prepared* posts.
//
// Indexed posts consist of just that post's ID (in the database) and the time it was created. An indexed post takes up very little memory, so
// it's not a huge priority to keep trimming the indexed posts list.
//
// Prepared posts consist of the post's database ID, the time it was created, AND the apimodel representation of that post, for quick serialization.
// Prepared posts of course take up more memory than indexed posts, so they should be regularly pruned if they're not being actively served.
type Manager interface {
// Ingest takes one status and indexes it into the timeline for the given account ID.
//
// It should already be established before calling this function that the status/post actually belongs in the timeline!
Ingest(status *gtsmodel.Status, timelineAccountID string) error
// IngestAndPrepare takes one status and indexes it into the timeline for the given account ID, and then immediately prepares it for serving.
// This is useful in cases where we know the status will need to be shown at the top of a user's timeline immediately (eg., a new status is created).
//
// It should already be established before calling this function that the status/post actually belongs in the timeline!
IngestAndPrepare(status *gtsmodel.Status, timelineAccountID string) error
// HomeTimeline returns limit n amount of entries from the home timeline of the given account ID, in descending chronological order.
// If maxID is provided, it will return entries from that maxID onwards, inclusive.
HomeTimeline(accountID string, maxID string, sinceID string, minID string, limit int, local bool) ([]*apimodel.Status, error)
// GetIndexedLength returns the amount of posts/statuses that have been *indexed* for the given account ID.
GetIndexedLength(timelineAccountID string) int
// GetDesiredIndexLength returns the amount of posts that we, ideally, index for each user.
GetDesiredIndexLength() int
// GetOldestIndexedID returns the status ID for the oldest post that we have indexed for the given account.
GetOldestIndexedID(timelineAccountID string) (string, error)
// PrepareXFromTop prepares limit n amount of posts, based on their indexed representations, from the top of the index.
PrepareXFromTop(timelineAccountID string, limit int) error
// WipeStatusFromTimeline completely removes a status and from the index and prepared posts of the given account ID
//
// The returned int indicates how many entries were removed.
WipeStatusFromTimeline(timelineAccountID string, statusID string) (int, error)
// WipeStatusFromAllTimelines removes the status from the index and prepared posts of all timelines
WipeStatusFromAllTimelines(statusID string) error
}
// NewManager returns a new timeline manager with the given database, typeconverter, config, and log.
func NewManager(db db.DB, tc typeutils.TypeConverter, config *config.Config, log *logrus.Logger) Manager {
return &manager{
accountTimelines: sync.Map{},
db: db,
tc: tc,
config: config,
log: log,
}
}
type manager struct {
accountTimelines sync.Map
db db.DB
tc typeutils.TypeConverter
config *config.Config
log *logrus.Logger
}
func (m *manager) Ingest(status *gtsmodel.Status, timelineAccountID string) error {
l := m.log.WithFields(logrus.Fields{
"func": "Ingest",
"timelineAccountID": timelineAccountID,
"statusID": status.ID,
})
t := m.getOrCreateTimeline(timelineAccountID)
l.Trace("ingesting status")
return t.IndexOne(status.CreatedAt, status.ID)
}
func (m *manager) IngestAndPrepare(status *gtsmodel.Status, timelineAccountID string) error {
l := m.log.WithFields(logrus.Fields{
"func": "IngestAndPrepare",
"timelineAccountID": timelineAccountID,
"statusID": status.ID,
})
t := m.getOrCreateTimeline(timelineAccountID)
l.Trace("ingesting status")
return t.IndexAndPrepareOne(status.CreatedAt, status.ID)
}
func (m *manager) Remove(statusID string, timelineAccountID string) (int, error) {
l := m.log.WithFields(logrus.Fields{
"func": "Remove",
"timelineAccountID": timelineAccountID,
"statusID": statusID,
})
t := m.getOrCreateTimeline(timelineAccountID)
l.Trace("removing status")
return t.Remove(statusID)
}
func (m *manager) HomeTimeline(timelineAccountID string, maxID string, sinceID string, minID string, limit int, local bool) ([]*apimodel.Status, error) {
l := m.log.WithFields(logrus.Fields{
"func": "HomeTimelineGet",
"timelineAccountID": timelineAccountID,
})
t := m.getOrCreateTimeline(timelineAccountID)
statuses, err := t.Get(limit, maxID, sinceID, minID)
if err != nil {
l.Errorf("error getting statuses: %s", err)
}
return statuses, nil
}
func (m *manager) GetIndexedLength(timelineAccountID string) int {
t := m.getOrCreateTimeline(timelineAccountID)
return t.PostIndexLength()
}
func (m *manager) GetDesiredIndexLength() int {
return desiredPostIndexLength
}
func (m *manager) GetOldestIndexedID(timelineAccountID string) (string, error) {
t := m.getOrCreateTimeline(timelineAccountID)
return t.OldestIndexedPostID()
}
func (m *manager) PrepareXFromTop(timelineAccountID string, limit int) error {
t := m.getOrCreateTimeline(timelineAccountID)
return t.PrepareFromTop(limit)
}
func (m *manager) WipeStatusFromTimeline(timelineAccountID string, statusID string) (int, error) {
t := m.getOrCreateTimeline(timelineAccountID)
return t.Remove(statusID)
}
func (m *manager) WipeStatusFromAllTimelines(statusID string) error {
errors := []string{}
m.accountTimelines.Range(func(k interface{}, i interface{}) bool {
t, ok := i.(Timeline)
if !ok {
panic("couldn't parse entry as Timeline, this should never happen so panic")
}
if _, err := t.Remove(statusID); err != nil {
errors = append(errors, err.Error())
}
return false
})
var err error
if len(errors) > 0 {
err = fmt.Errorf("one or more errors removing status %s from all timelines: %s", statusID, strings.Join(errors, ";"))
}
return err
}
func (m *manager) getOrCreateTimeline(timelineAccountID string) Timeline {
var t Timeline
i, ok := m.accountTimelines.Load(timelineAccountID)
if !ok {
t = NewTimeline(timelineAccountID, m.db, m.tc, m.log)
m.accountTimelines.Store(timelineAccountID, t)
} else {
t, ok = i.(Timeline)
if !ok {
panic("couldn't parse entry as Timeline, this should never happen so panic")
}
}
return t
}