gotosocial/internal/db/bundb/timeline.go

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/*
GoToSocial
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Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
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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 bundb
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import (
"context"
"database/sql"
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"sort"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/uptrace/bun"
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)
type timelineDB struct {
conn *DBConn
}
func (t *timelineDB) GetHomeTimeline(ctx context.Context, accountID string, maxID string, sinceID string, minID string, limit int, local bool) ([]*gtsmodel.Status, db.Error) {
// Ensure reasonable
if limit < 0 {
limit = 0
}
// Make educated guess for slice size
statuses := make([]*gtsmodel.Status, 0, limit)
q := t.conn.
NewSelect().
Model(&statuses)
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q = q.ColumnExpr("status.*").
// Find out who accountID follows.
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Join("LEFT JOIN follows AS f ON f.target_account_id = status.account_id").
// Sort by highest ID (newest) to lowest ID (oldest)
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Order("status.id DESC")
if maxID != "" {
// return only statuses LOWER (ie., older) than maxID
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q = q.Where("status.id < ?", maxID)
}
if sinceID != "" {
// return only statuses HIGHER (ie., newer) than sinceID
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q = q.Where("status.id > ?", sinceID)
}
if minID != "" {
// return only statuses HIGHER (ie., newer) than minID
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q = q.Where("status.id > ?", minID)
}
if local {
// return only statuses posted by local account havers
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q = q.Where("status.local = ?", local)
}
if limit > 0 {
// limit amount of statuses returned
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q = q.Limit(limit)
}
// Use a WhereGroup here to specify that we want EITHER statuses posted by accounts that accountID follows,
// OR statuses posted by accountID itself (since a user should be able to see their own statuses).
//
// This is equivalent to something like WHERE ... AND (... OR ...)
// See: https://bun.uptrace.dev/guide/queries.html#select
whereGroup := func(*bun.SelectQuery) *bun.SelectQuery {
return q.
WhereOr("f.account_id = ?", accountID).
WhereOr("status.account_id = ?", accountID)
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}
q = q.WhereGroup(" AND ", whereGroup)
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if err := q.Scan(ctx); err != nil {
return nil, t.conn.ProcessError(err)
}
return statuses, nil
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}
func (t *timelineDB) GetPublicTimeline(ctx context.Context, accountID string, maxID string, sinceID string, minID string, limit int, local bool) ([]*gtsmodel.Status, db.Error) {
// Ensure reasonable
if limit < 0 {
limit = 0
}
// Make educated guess for slice size
statuses := make([]*gtsmodel.Status, 0, limit)
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q := t.conn.
NewSelect().
Model(&statuses).
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Where("visibility = ?", gtsmodel.VisibilityPublic).
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WhereGroup(" AND ", whereEmptyOrNull("in_reply_to_id")).
WhereGroup(" AND ", whereEmptyOrNull("in_reply_to_uri")).
WhereGroup(" AND ", whereEmptyOrNull("boost_of_id")).
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Order("status.id DESC")
if maxID != "" {
q = q.Where("status.id < ?", maxID)
}
if sinceID != "" {
q = q.Where("status.id > ?", sinceID)
}
if minID != "" {
q = q.Where("status.id > ?", minID)
}
if local {
q = q.Where("status.local = ?", local)
}
if limit > 0 {
q = q.Limit(limit)
}
if err := q.Scan(ctx); err != nil {
return nil, t.conn.ProcessError(err)
}
return statuses, nil
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}
// TODO optimize this query and the logic here, because it's slow as balls -- it takes like a literal second to return with a limit of 20!
// It might be worth serving it through a timeline instead of raw DB queries, like we do for Home feeds.
func (t *timelineDB) GetFavedTimeline(ctx context.Context, accountID string, maxID string, minID string, limit int) ([]*gtsmodel.Status, string, string, db.Error) {
// Ensure reasonable
if limit < 0 {
limit = 0
}
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// Make educated guess for slice size
faves := make([]*gtsmodel.StatusFave, 0, limit)
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fq := t.conn.
NewSelect().
Model(&faves).
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Where("account_id = ?", accountID).
Order("id DESC")
if maxID != "" {
fq = fq.Where("id < ?", maxID)
}
if minID != "" {
fq = fq.Where("id > ?", minID)
}
if limit > 0 {
fq = fq.Limit(limit)
}
err := fq.Scan(ctx)
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if err != nil {
if err == sql.ErrNoRows {
return nil, "", "", db.ErrNoEntries
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}
return nil, "", "", err
}
if len(faves) == 0 {
return nil, "", "", db.ErrNoEntries
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}
// map[statusID]faveID -- we need this to sort statuses by fave ID rather than status ID
statusesFavesMap := make(map[string]string, len(faves))
statusIDs := make([]string, 0, len(faves))
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for _, f := range faves {
statusesFavesMap[f.StatusID] = f.ID
statusIDs = append(statusIDs, f.StatusID)
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}
statuses := make([]*gtsmodel.Status, 0, len(statusIDs))
err = t.conn.
NewSelect().
Model(&statuses).
Where("id IN (?)", bun.In(statusIDs)).
Scan(ctx)
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if err != nil {
return nil, "", "", t.conn.ProcessError(err)
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}
if len(statuses) == 0 {
return nil, "", "", db.ErrNoEntries
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}
// arrange statuses by fave ID
sort.Slice(statuses, func(i int, j int) bool {
statusI := statuses[i]
statusJ := statuses[j]
return statusesFavesMap[statusI.ID] < statusesFavesMap[statusJ.ID]
})
nextMaxID := faves[len(faves)-1].ID
prevMinID := faves[0].ID
return statuses, nextMaxID, prevMinID, nil
}