mirror of
https://github.com/superseriousbusiness/gotosocial.git
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218 lines
8 KiB
Go
218 lines
8 KiB
Go
/*
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GoToSocial
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Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package timeline
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import (
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"fmt"
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"strings"
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"sync"
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"github.com/sirupsen/logrus"
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apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
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"github.com/superseriousbusiness/gotosocial/internal/config"
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"github.com/superseriousbusiness/gotosocial/internal/db"
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"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
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"github.com/superseriousbusiness/gotosocial/internal/typeutils"
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)
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const (
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desiredPostIndexLength = 400
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)
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// Manager abstracts functions for creating timelines for multiple accounts, and adding, removing, and fetching entries from those timelines.
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//
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// By the time a status hits the manager interface, it should already have been filtered and it should be established that the status indeed
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// belongs in the home timeline of the given account ID.
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//
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// The manager makes a distinction between *indexed* posts and *prepared* posts.
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//
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// 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
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// it's not a huge priority to keep trimming the indexed posts list.
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//
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// Prepared posts consist of the post's database ID, the time it was created, AND the apimodel representation of that post, for quick serialization.
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// Prepared posts of course take up more memory than indexed posts, so they should be regularly pruned if they're not being actively served.
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type Manager interface {
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// Ingest takes one status and indexes it into the timeline for the given account ID.
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//
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// It should already be established before calling this function that the status/post actually belongs in the timeline!
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Ingest(status *gtsmodel.Status, timelineAccountID string) error
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// IngestAndPrepare takes one status and indexes it into the timeline for the given account ID, and then immediately prepares it for serving.
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// 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).
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//
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// It should already be established before calling this function that the status/post actually belongs in the timeline!
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IngestAndPrepare(status *gtsmodel.Status, timelineAccountID string) error
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// HomeTimeline returns limit n amount of entries from the home timeline of the given account ID, in descending chronological order.
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// If maxID is provided, it will return entries from that maxID onwards, inclusive.
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HomeTimeline(accountID string, maxID string, sinceID string, minID string, limit int, local bool) ([]*apimodel.Status, error)
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// GetIndexedLength returns the amount of posts/statuses that have been *indexed* for the given account ID.
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GetIndexedLength(timelineAccountID string) int
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// GetDesiredIndexLength returns the amount of posts that we, ideally, index for each user.
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GetDesiredIndexLength() int
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// GetOldestIndexedID returns the status ID for the oldest post that we have indexed for the given account.
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GetOldestIndexedID(timelineAccountID string) (string, error)
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// PrepareXFromTop prepares limit n amount of posts, based on their indexed representations, from the top of the index.
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PrepareXFromTop(timelineAccountID string, limit int) error
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// WipeStatusFromTimeline completely removes a status and from the index and prepared posts of the given account ID
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//
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// The returned int indicates how many entries were removed.
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WipeStatusFromTimeline(timelineAccountID string, statusID string) (int, error)
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// WipeStatusFromAllTimelines removes the status from the index and prepared posts of all timelines
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WipeStatusFromAllTimelines(statusID string) error
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}
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// NewManager returns a new timeline manager with the given database, typeconverter, config, and log.
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func NewManager(db db.DB, tc typeutils.TypeConverter, config *config.Config, log *logrus.Logger) Manager {
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return &manager{
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accountTimelines: sync.Map{},
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db: db,
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tc: tc,
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config: config,
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log: log,
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}
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}
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type manager struct {
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accountTimelines sync.Map
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db db.DB
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tc typeutils.TypeConverter
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config *config.Config
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log *logrus.Logger
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}
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func (m *manager) Ingest(status *gtsmodel.Status, timelineAccountID string) error {
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l := m.log.WithFields(logrus.Fields{
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"func": "Ingest",
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"timelineAccountID": timelineAccountID,
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"statusID": status.ID,
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})
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t := m.getOrCreateTimeline(timelineAccountID)
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l.Trace("ingesting status")
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return t.IndexOne(status.CreatedAt, status.ID, status.BoostOfID)
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}
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func (m *manager) IngestAndPrepare(status *gtsmodel.Status, timelineAccountID string) error {
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l := m.log.WithFields(logrus.Fields{
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"func": "IngestAndPrepare",
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"timelineAccountID": timelineAccountID,
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"statusID": status.ID,
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})
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t := m.getOrCreateTimeline(timelineAccountID)
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l.Trace("ingesting status")
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return t.IndexAndPrepareOne(status.CreatedAt, status.ID)
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}
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func (m *manager) Remove(statusID string, timelineAccountID string) (int, error) {
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l := m.log.WithFields(logrus.Fields{
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"func": "Remove",
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"timelineAccountID": timelineAccountID,
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"statusID": statusID,
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})
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t := m.getOrCreateTimeline(timelineAccountID)
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l.Trace("removing status")
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return t.Remove(statusID)
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}
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func (m *manager) HomeTimeline(timelineAccountID string, maxID string, sinceID string, minID string, limit int, local bool) ([]*apimodel.Status, error) {
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l := m.log.WithFields(logrus.Fields{
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"func": "HomeTimelineGet",
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"timelineAccountID": timelineAccountID,
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})
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t := m.getOrCreateTimeline(timelineAccountID)
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statuses, err := t.Get(limit, maxID, sinceID, minID)
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if err != nil {
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l.Errorf("error getting statuses: %s", err)
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}
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return statuses, nil
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}
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func (m *manager) GetIndexedLength(timelineAccountID string) int {
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t := m.getOrCreateTimeline(timelineAccountID)
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return t.PostIndexLength()
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}
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func (m *manager) GetDesiredIndexLength() int {
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return desiredPostIndexLength
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}
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func (m *manager) GetOldestIndexedID(timelineAccountID string) (string, error) {
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t := m.getOrCreateTimeline(timelineAccountID)
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return t.OldestIndexedPostID()
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}
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func (m *manager) PrepareXFromTop(timelineAccountID string, limit int) error {
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t := m.getOrCreateTimeline(timelineAccountID)
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return t.PrepareFromTop(limit)
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}
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func (m *manager) WipeStatusFromTimeline(timelineAccountID string, statusID string) (int, error) {
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t := m.getOrCreateTimeline(timelineAccountID)
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return t.Remove(statusID)
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}
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func (m *manager) WipeStatusFromAllTimelines(statusID string) error {
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errors := []string{}
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m.accountTimelines.Range(func(k interface{}, i interface{}) bool {
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t, ok := i.(Timeline)
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if !ok {
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panic("couldn't parse entry as Timeline, this should never happen so panic")
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}
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if _, err := t.Remove(statusID); err != nil {
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errors = append(errors, err.Error())
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}
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return false
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})
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var err error
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if len(errors) > 0 {
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err = fmt.Errorf("one or more errors removing status %s from all timelines: %s", statusID, strings.Join(errors, ";"))
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}
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return err
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}
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func (m *manager) getOrCreateTimeline(timelineAccountID string) Timeline {
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var t Timeline
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i, ok := m.accountTimelines.Load(timelineAccountID)
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if !ok {
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t = NewTimeline(timelineAccountID, m.db, m.tc, m.log)
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m.accountTimelines.Store(timelineAccountID, t)
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} else {
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t, ok = i.(Timeline)
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if !ok {
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panic("couldn't parse entry as Timeline, this should never happen so panic")
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}
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}
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return t
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}
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