mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-15 19:56:38 +00:00
63fc9b6c3e
* renames the `GTS` caches to `DB` caches, as it better references what they are * change remaining Caches.GTS uses to Caches.DB
113 lines
3.2 KiB
Go
113 lines
3.2 KiB
Go
// GoToSocial
|
|
// Copyright (C) GoToSocial Authors admin@gotosocial.org
|
|
// SPDX-License-Identifier: AGPL-3.0-or-later
|
|
//
|
|
// 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
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"fmt"
|
|
"time"
|
|
|
|
"github.com/superseriousbusiness/gotosocial/internal/db"
|
|
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
|
|
"github.com/superseriousbusiness/gotosocial/internal/state"
|
|
"github.com/uptrace/bun"
|
|
)
|
|
|
|
type markerDB struct {
|
|
db *bun.DB
|
|
state *state.State
|
|
}
|
|
|
|
/*
|
|
MARKER FUNCTIONS
|
|
*/
|
|
|
|
func (m *markerDB) GetMarker(ctx context.Context, accountID string, name gtsmodel.MarkerName) (*gtsmodel.Marker, error) {
|
|
marker, err := m.state.Caches.DB.Marker.LoadOne(
|
|
"AccountID,Name",
|
|
func() (*gtsmodel.Marker, error) {
|
|
var marker gtsmodel.Marker
|
|
|
|
if err := m.db.NewSelect().
|
|
Model(&marker).
|
|
Where("? = ? AND ? = ?", bun.Ident("account_id"), accountID, bun.Ident("name"), name).
|
|
Scan(ctx); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &marker, nil
|
|
}, accountID, name,
|
|
)
|
|
if err != nil {
|
|
return nil, err // already processed
|
|
}
|
|
|
|
return marker, nil
|
|
}
|
|
|
|
func (m *markerDB) UpdateMarker(ctx context.Context, marker *gtsmodel.Marker) error {
|
|
prevMarker, err := m.GetMarker(ctx, marker.AccountID, marker.Name)
|
|
if err != nil && !errors.Is(err, db.ErrNoEntries) {
|
|
return fmt.Errorf("UpdateMarker: error fetching previous version of marker: %w", err)
|
|
}
|
|
|
|
marker.UpdatedAt = time.Now()
|
|
if prevMarker != nil {
|
|
marker.Version = prevMarker.Version + 1
|
|
}
|
|
|
|
return m.state.Caches.DB.Marker.Store(marker, func() error {
|
|
if prevMarker == nil {
|
|
if _, err := m.db.NewInsert().
|
|
Model(marker).
|
|
Exec(ctx); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Optimistic concurrency control: start a transaction, try to update a row with a previously retrieved version.
|
|
// If the update in the transaction fails to actually change anything, another update happened concurrently, and
|
|
// this update should be retried by the caller, which in this case involves sending HTTP 409 to the API client.
|
|
return m.db.RunInTx(ctx, nil, func(ctx context.Context, tx bun.Tx) error {
|
|
result, err := tx.NewUpdate().
|
|
Model(marker).
|
|
WherePK().
|
|
Where("? = ?", bun.Ident("version"), prevMarker.Version).
|
|
Exec(ctx)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
rowsAffected, err := result.RowsAffected()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if rowsAffected == 0 {
|
|
// Will trigger a rollback, although there should be no changes to roll back.
|
|
return db.ErrAlreadyExists
|
|
} else if rowsAffected > 1 {
|
|
// This shouldn't happen.
|
|
return db.ErrNoEntries
|
|
}
|
|
|
|
return nil
|
|
})
|
|
})
|
|
}
|