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