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