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Repeatable reads for /sync (#2783)

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This puts repeatable reads into all sync streams.

Co-authored-by: kegsay <kegan@matrix.org>
This commit is contained in:
Neil Alexander 2022-12-06 18:16:17 +00:00 committed by GitHub
parent ded43e0f2d
commit ba2ffb7da9
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1 changed files with 17 additions and 25 deletions
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42
syncapi/storage/shared/storage_consumer.go
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@ -57,31 +57,23 @@ type Database struct {
}
func (d *Database) NewDatabaseSnapshot(ctx context.Context) (*DatabaseTransaction, error) {
return d.NewDatabaseTransaction(ctx)
/*
TODO: Repeatable read is probably the right thing to do here,
but it seems to cause some problems with the invite tests, so
need to investigate that further.
txn, err := d.DB.BeginTx(ctx, &sql.TxOptions{
// Set the isolation level so that we see a snapshot of the database.
// In PostgreSQL repeatable read transactions will see a snapshot taken
// at the first query, and since the transaction is read-only it can't
// run into any serialisation errors.
// https://www.postgresql.org/docs/9.5/static/transaction-iso.html#XACT-REPEATABLE-READ
Isolation: sql.LevelRepeatableRead,
ReadOnly: true,
})
if err != nil {
return nil, err
}
return &DatabaseTransaction{
Database: d,
ctx: ctx,
txn: txn,
}, nil
*/
txn, err := d.DB.BeginTx(ctx, &sql.TxOptions{
// Set the isolation level so that we see a snapshot of the database.
// In PostgreSQL repeatable read transactions will see a snapshot taken
// at the first query, and since the transaction is read-only it can't
// run into any serialisation errors.
// https://www.postgresql.org/docs/9.5/static/transaction-iso.html#XACT-REPEATABLE-READ
Isolation: sql.LevelRepeatableRead,
ReadOnly: true,
})
if err != nil {
return nil, err
}
return &DatabaseTransaction{
Database: d,
ctx: ctx,
txn: txn,
}, nil
}
func (d *Database) NewDatabaseTransaction(ctx context.Context) (*DatabaseTransaction, error) {