259 lines
6.8 KiB
Go
259 lines
6.8 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"
|
|
"database/sql"
|
|
"time"
|
|
|
|
"github.com/superseriousbusiness/gotosocial/internal/db"
|
|
"github.com/superseriousbusiness/gotosocial/internal/gtserror"
|
|
"github.com/uptrace/bun"
|
|
"github.com/uptrace/bun/dialect"
|
|
)
|
|
|
|
// WrappedDB wraps a bun database instance
|
|
// to provide common per-dialect SQL error
|
|
// conversions to common types, and retries
|
|
// on returned busy errors (SQLite only for now).
|
|
type WrappedDB struct {
|
|
errHook func(error) error
|
|
*bun.DB // underlying conn
|
|
}
|
|
|
|
// WrapDB wraps a bun database instance in our own WrappedDB type.
|
|
func WrapDB(db *bun.DB) *WrappedDB {
|
|
var errProc func(error) error
|
|
switch name := db.Dialect().Name(); name {
|
|
case dialect.PG:
|
|
errProc = processPostgresError
|
|
case dialect.SQLite:
|
|
errProc = processSQLiteError
|
|
default:
|
|
panic("unknown dialect name: " + name.String())
|
|
}
|
|
return &WrappedDB{
|
|
errHook: errProc,
|
|
DB: db,
|
|
}
|
|
}
|
|
|
|
// BeginTx wraps bun.DB.BeginTx() with retry-busy timeout.
|
|
func (db *WrappedDB) BeginTx(ctx context.Context, opts *sql.TxOptions) (tx bun.Tx, err error) {
|
|
err = retryOnBusy(ctx, func() error {
|
|
tx, err = db.DB.BeginTx(ctx, opts)
|
|
err = db.ProcessError(err)
|
|
return err
|
|
})
|
|
return
|
|
}
|
|
|
|
// ExecContext wraps bun.DB.ExecContext() with retry-busy timeout.
|
|
func (db *WrappedDB) ExecContext(ctx context.Context, query string, args ...any) (result sql.Result, err error) {
|
|
err = retryOnBusy(ctx, func() error {
|
|
result, err = db.DB.ExecContext(ctx, query, args...)
|
|
err = db.ProcessError(err)
|
|
return err
|
|
})
|
|
return
|
|
}
|
|
|
|
// QueryContext wraps bun.DB.QueryContext() with retry-busy timeout.
|
|
func (db *WrappedDB) QueryContext(ctx context.Context, query string, args ...any) (rows *sql.Rows, err error) {
|
|
err = retryOnBusy(ctx, func() error {
|
|
rows, err = db.DB.QueryContext(ctx, query, args...)
|
|
err = db.ProcessError(err)
|
|
return err
|
|
})
|
|
return
|
|
}
|
|
|
|
// QueryRowContext wraps bun.DB.QueryRowContext() with retry-busy timeout.
|
|
func (db *WrappedDB) QueryRowContext(ctx context.Context, query string, args ...any) (row *sql.Row) {
|
|
_ = retryOnBusy(ctx, func() error {
|
|
row = db.DB.QueryRowContext(ctx, query, args...)
|
|
err := db.ProcessError(row.Err())
|
|
return err
|
|
})
|
|
return
|
|
}
|
|
|
|
// RunInTx is functionally the same as bun.DB.RunInTx() but with retry-busy timeouts.
|
|
func (db *WrappedDB) RunInTx(ctx context.Context, fn func(bun.Tx) error) error {
|
|
// Attempt to start new transaction.
|
|
tx, err := db.BeginTx(ctx, nil)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
var done bool
|
|
|
|
defer func() {
|
|
if !done {
|
|
// Rollback (with retry-backoff).
|
|
_ = retryOnBusy(ctx, func() error {
|
|
err := tx.Rollback()
|
|
return db.errHook(err)
|
|
})
|
|
}
|
|
}()
|
|
|
|
// Perform supplied transaction
|
|
if err := fn(tx); err != nil {
|
|
return db.errHook(err)
|
|
}
|
|
|
|
// Commit (with retry-backoff).
|
|
err = retryOnBusy(ctx, func() error {
|
|
err := tx.Commit()
|
|
return db.errHook(err)
|
|
})
|
|
done = true
|
|
return err
|
|
}
|
|
|
|
func (db *WrappedDB) NewValues(model interface{}) *bun.ValuesQuery {
|
|
return bun.NewValuesQuery(db.DB, model).Conn(db)
|
|
}
|
|
|
|
func (db *WrappedDB) NewMerge() *bun.MergeQuery {
|
|
return bun.NewMergeQuery(db.DB).Conn(db)
|
|
}
|
|
|
|
func (db *WrappedDB) NewSelect() *bun.SelectQuery {
|
|
return bun.NewSelectQuery(db.DB).Conn(db)
|
|
}
|
|
|
|
func (db *WrappedDB) NewInsert() *bun.InsertQuery {
|
|
return bun.NewInsertQuery(db.DB).Conn(db)
|
|
}
|
|
|
|
func (db *WrappedDB) NewUpdate() *bun.UpdateQuery {
|
|
return bun.NewUpdateQuery(db.DB).Conn(db)
|
|
}
|
|
|
|
func (db *WrappedDB) NewDelete() *bun.DeleteQuery {
|
|
return bun.NewDeleteQuery(db.DB).Conn(db)
|
|
}
|
|
|
|
func (db *WrappedDB) NewRaw(query string, args ...interface{}) *bun.RawQuery {
|
|
return bun.NewRawQuery(db.DB, query, args...).Conn(db)
|
|
}
|
|
|
|
func (db *WrappedDB) NewCreateTable() *bun.CreateTableQuery {
|
|
return bun.NewCreateTableQuery(db.DB).Conn(db)
|
|
}
|
|
|
|
func (db *WrappedDB) NewDropTable() *bun.DropTableQuery {
|
|
return bun.NewDropTableQuery(db.DB).Conn(db)
|
|
}
|
|
|
|
func (db *WrappedDB) NewCreateIndex() *bun.CreateIndexQuery {
|
|
return bun.NewCreateIndexQuery(db.DB).Conn(db)
|
|
}
|
|
|
|
func (db *WrappedDB) NewDropIndex() *bun.DropIndexQuery {
|
|
return bun.NewDropIndexQuery(db.DB).Conn(db)
|
|
}
|
|
|
|
func (db *WrappedDB) NewTruncateTable() *bun.TruncateTableQuery {
|
|
return bun.NewTruncateTableQuery(db.DB).Conn(db)
|
|
}
|
|
|
|
func (db *WrappedDB) NewAddColumn() *bun.AddColumnQuery {
|
|
return bun.NewAddColumnQuery(db.DB).Conn(db)
|
|
}
|
|
|
|
func (db *WrappedDB) NewDropColumn() *bun.DropColumnQuery {
|
|
return bun.NewDropColumnQuery(db.DB).Conn(db)
|
|
}
|
|
|
|
// ProcessError processes an error to replace any known values with our own error types,
|
|
// making it easier to catch specific situations (e.g. no rows, already exists, etc)
|
|
func (db *WrappedDB) ProcessError(err error) error {
|
|
if err == nil {
|
|
return nil
|
|
}
|
|
return db.errHook(err)
|
|
}
|
|
|
|
// Exists checks the results of a SelectQuery for the existence of the data in question, masking ErrNoEntries errors
|
|
func (db *WrappedDB) Exists(ctx context.Context, query *bun.SelectQuery) (bool, error) {
|
|
exists, err := query.Exists(ctx)
|
|
switch err {
|
|
case nil:
|
|
return exists, nil
|
|
case sql.ErrNoRows:
|
|
return false, nil
|
|
default:
|
|
return false, err
|
|
}
|
|
}
|
|
|
|
// NotExists is the functional opposite of conn.Exists()
|
|
func (db *WrappedDB) NotExists(ctx context.Context, query *bun.SelectQuery) (bool, error) {
|
|
exists, err := db.Exists(ctx, query)
|
|
return !exists, err
|
|
}
|
|
|
|
// retryOnBusy will retry given function on returned 'errBusy'.
|
|
func retryOnBusy(ctx context.Context, fn func() error) error {
|
|
var backoff time.Duration
|
|
|
|
for i := 0; ; i++ {
|
|
// Perform func.
|
|
err := fn()
|
|
|
|
if err != errBusy {
|
|
// May be nil, or may be
|
|
// some other error, either
|
|
// way return here.
|
|
return err
|
|
}
|
|
|
|
// backoff according to a multiplier of 2ms * 2^2n,
|
|
// up to a maximum possible backoff time of 5 minutes.
|
|
//
|
|
// this works out as the following:
|
|
// 4ms
|
|
// 16ms
|
|
// 64ms
|
|
// 256ms
|
|
// 1.024s
|
|
// 4.096s
|
|
// 16.384s
|
|
// 1m5.536s
|
|
// 4m22.144s
|
|
backoff = 2 * time.Millisecond * (1 << (2*i + 1))
|
|
if backoff >= 5*time.Minute {
|
|
break
|
|
}
|
|
|
|
select {
|
|
// Context cancelled.
|
|
case <-ctx.Done():
|
|
|
|
// Backoff for some time.
|
|
case <-time.After(backoff):
|
|
}
|
|
}
|
|
|
|
return gtserror.Newf("%w (waited > %s)", db.ErrBusyTimeout, backoff)
|
|
}
|