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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"database/sql"
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"github.com/superseriousbusiness/gotosocial/internal/db"
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"github.com/uptrace/bun"
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"github.com/uptrace/bun/dialect"
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)
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// DBConn wrapps a bun.DB conn to provide SQL-type specific additional functionality
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type DBConn struct {
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errProc func(error) db.Error // errProc is the SQL-type specific error processor
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*bun.DB // DB is the underlying bun.DB connection
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}
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// WrapDBConn wraps a bun DB connection to provide our own error processing dependent on DB dialect.
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func WrapDBConn(dbConn *bun.DB) *DBConn {
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var errProc func(error) db.Error
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switch dbConn.Dialect().Name() {
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case dialect.PG:
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errProc = processPostgresError
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case dialect.SQLite:
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errProc = processSQLiteError
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default:
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panic("unknown dialect name: " + dbConn.Dialect().Name().String())
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}
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return &DBConn{
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errProc: errProc,
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DB: dbConn,
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}
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}
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// RunInTx wraps execution of the supplied transaction function.
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func (conn *DBConn) RunInTx(ctx context.Context, fn func(bun.Tx) error) db.Error {
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return conn.ProcessError(func() error {
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// Acquire a new transaction
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tx, err := conn.BeginTx(ctx, nil)
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if err != nil {
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return err
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}
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var done bool
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defer func() {
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if !done {
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_ = tx.Rollback()
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}
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}()
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// Perform supplied transaction
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if err := fn(tx); err != nil {
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return err
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}
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// Finally, commit
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err = tx.Commit() //nolint:contextcheck
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done = true
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return err
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}())
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}
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// ProcessError processes an error to replace any known values with our own db.Error types,
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// making it easier to catch specific situations (e.g. no rows, already exists, etc)
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func (conn *DBConn) ProcessError(err error) db.Error {
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switch {
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case err == nil:
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return nil
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case err == sql.ErrNoRows:
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return db.ErrNoEntries
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default:
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return conn.errProc(err)
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}
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}
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// Exists checks the results of a SelectQuery for the existence of the data in question, masking ErrNoEntries errors
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func (conn *DBConn) Exists(ctx context.Context, query *bun.SelectQuery) (bool, db.Error) {
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exists, err := query.Exists(ctx)
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// Process error as our own and check if it exists
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switch err := conn.ProcessError(err); err {
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case nil:
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return exists, nil
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case db.ErrNoEntries:
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return false, nil
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default:
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return false, err
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}
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}
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// NotExists is the functional opposite of conn.Exists()
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func (conn *DBConn) NotExists(ctx context.Context, query *bun.SelectQuery) (bool, db.Error) {
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exists, err := conn.Exists(ctx, query)
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return !exists, err
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}
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