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Use TransactionWriter to reduce database lock issues on SQLite (#1192)

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Neil Alexander 2020-07-09 17:48:56 +01:00 committed by GitHub
parent 99b50f30a0
commit 9cc52f47f3
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1 changed files with 28 additions and 15 deletions
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39
federationsender/storage/sqlite3/storage.go
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@ -36,6 +36,8 @@ type Database struct {
queueJSONStatements
sqlutil.PartitionOffsetStatements
db *sql.DB
queuePDUsWriter *sqlutil.TransactionWriter
queueJSONWriter *sqlutil.TransactionWriter
}
// NewDatabase opens a new database
@ -74,6 +76,9 @@ func (d *Database) prepare() error {
return err
}
d.queuePDUsWriter = sqlutil.NewTransactionWriter()
d.queueJSONWriter = sqlutil.NewTransactionWriter()
return d.PartitionOffsetStatements.Prepare(d.db, "federationsender")
}
@ -145,12 +150,16 @@ func (d *Database) GetJoinedHosts(
// metadata entries.
func (d *Database) StoreJSON(
ctx context.Context, js string,
) (int64, error) {
nid, err := d.insertQueueJSON(ctx, nil, js)
if err != nil {
return 0, fmt.Errorf("d.insertQueueJSON: %w", err)
) (nid int64, err error) {
err = d.queueJSONWriter.Do(d.db, func(txn *sql.Tx) error {
n, e := d.insertQueueJSON(ctx, nil, js)
if e != nil {
return fmt.Errorf("d.insertQueueJSON: %w", e)
}
return nid, nil
nid = n
return nil
})
return
}
// AssociatePDUWithDestination creates an association that the
@ -162,7 +171,7 @@ func (d *Database) AssociatePDUWithDestination(
serverName gomatrixserverlib.ServerName,
nids []int64,
) error {
return sqlutil.WithTransaction(d.db, func(txn *sql.Tx) error {
return d.queuePDUsWriter.Do(d.db, func(txn *sql.Tx) error {
for _, nid := range nids {
if err := d.insertQueuePDU(
ctx, // context
@ -230,18 +239,18 @@ func (d *Database) CleanTransactionPDUs(
serverName gomatrixserverlib.ServerName,
transactionID gomatrixserverlib.TransactionID,
) error {
return sqlutil.WithTransaction(d.db, func(txn *sql.Tx) error {
nids, err := d.selectQueuePDUs(ctx, txn, serverName, transactionID, 50)
var err error
var nids []int64
var deleteNIDs []int64
if err = d.queuePDUsWriter.Do(d.db, func(txn *sql.Tx) error {
nids, err = d.selectQueuePDUs(ctx, txn, serverName, transactionID, 50)
if err != nil {
return fmt.Errorf("d.selectQueuePDUs: %w", err)
}
if err = d.deleteQueueTransaction(ctx, txn, serverName, transactionID); err != nil {
return fmt.Errorf("d.deleteQueueTransaction: %w", err)
}
var count int64
var deleteNIDs []int64
for _, nid := range nids {
count, err = d.selectQueueReferenceJSONCount(ctx, txn, nid)
if err != nil {
@ -251,15 +260,19 @@ func (d *Database) CleanTransactionPDUs(
deleteNIDs = append(deleteNIDs, nid)
}
}
return nil
}); err != nil {
return err
}
err = d.queueJSONWriter.Do(d.db, func(txn *sql.Tx) error {
if len(deleteNIDs) > 0 {
if err = d.deleteQueueJSON(ctx, txn, deleteNIDs); err != nil {
return fmt.Errorf("d.deleteQueueJSON: %w", err)
}
}
return nil
})
return err
}
// GetPendingPDUCount returns the number of PDUs waiting to be