func (si *SchemaInfo) createTable(conn dbconnpool.PoolConnection, tableName string) {
tables, err := conn.ExecuteFetch(fmt.Sprintf("%s and table_name = '%s'", base_show_tables, tableName), 1, false)
if err != nil {
panic(NewTabletError(FAIL, "Error fetching table %s: %v", tableName, err))
}
if len(tables.Rows) != 1 {
panic(NewTabletError(FAIL, "rows for %s !=1: %v", tableName, len(tables.Rows)))
}
tableInfo, err := NewTableInfo(
conn,
tableName,
tables.Rows[0][1].String(), // table_type
tables.Rows[0][2], // create_time
tables.Rows[0][3].String(), // table_comment
si.cachePool,
)
if err != nil {
panic(NewTabletError(FATAL, "Could not get load table %s: %v", tableName, err))
}
if tableInfo.CacheType == schema.CACHE_NONE {
log.Infof("Initialized table: %s", tableName)
} else {
log.Infof("Initialized cached table: %s", tableInfo.Cache.prefix)
}
si.mu.Lock()
defer si.mu.Unlock()
if _, ok := si.tables[tableName]; ok {
panic(NewTabletError(FAIL, "Table %s already exists", tableName))
}
si.tables[tableName] = tableInfo
}
func (axp *ActiveTxPool) SafeBegin(conn dbconnpool.PoolConnection) (transactionId int64, err error) {
defer handleError(&err, nil)
if _, err := conn.ExecuteFetch(BEGIN, 1, false); err != nil {
panic(NewTabletErrorSql(FAIL, err))
}
transactionId = axp.lastId.Add(1)
axp.pool.Register(transactionId, newTxConnection(conn, transactionId, axp))
return transactionId, nil
}
func (ti *TableInfo) fetchColumns(conn dbconnpool.PoolConnection) error {
columns, err := conn.ExecuteFetch(fmt.Sprintf("describe `%s`", ti.Name), 10000, false)
if err != nil {
return err
}
for _, row := range columns.Rows {
ti.AddColumn(row[0].String(), row[1].String(), row[4], row[5].String())
}
return nil
}
func (ti *TableInfo) fetchIndexes(conn dbconnpool.PoolConnection) error {
indexes, err := conn.ExecuteFetch(fmt.Sprintf("show index from `%s`", ti.Name), 10000, false)
if err != nil {
return err
}
var currentIndex *schema.Index
currentName := ""
for _, row := range indexes.Rows {
indexName := row[2].String()
if currentName != indexName {
currentIndex = ti.AddIndex(indexName)
currentName = indexName
}
var cardinality uint64
if !row[6].IsNull() {
cardinality, err = strconv.ParseUint(row[6].String(), 0, 64)
if err != nil {
log.Warningf("%s", err)
}
}
currentIndex.AddColumn(row[4].String(), cardinality)
}
if len(ti.Indexes) == 0 {
return nil
}
pkIndex := ti.Indexes[0]
if pkIndex.Name != "PRIMARY" {
return nil
}
ti.PKColumns = make([]int, len(pkIndex.Columns))
for i, pkCol := range pkIndex.Columns {
ti.PKColumns[i] = ti.FindColumn(pkCol)
}
// Primary key contains all table columns
for _, col := range ti.Columns {
pkIndex.DataColumns = append(pkIndex.DataColumns, col.Name)
}
// Secondary indices contain all primary key columns
for i := 1; i < len(ti.Indexes); i++ {
for _, c := range ti.Indexes[i].Columns {
ti.Indexes[i].DataColumns = append(ti.Indexes[i].DataColumns, c)
}
for _, c := range pkIndex.Columns {
// pk columns may already be part of the index. So,
// check before adding.
if ti.Indexes[i].FindDataColumn(c) != -1 {
continue
}
ti.Indexes[i].DataColumns = append(ti.Indexes[i].DataColumns, c)
}
}
return nil
}
// executeFetchContext calls ExecuteFetch() on the given connection,
// while respecting Context deadline and cancellation.
func (mysqld *Mysqld) executeFetchContext(ctx context.Context, conn dbconnpool.PoolConnection, query string, maxrows int, wantfields bool) (*sqltypes.Result, error) {
// Fast fail if context is done.
select {
case <-ctx.Done():
return nil, ctx.Err()
default:
}
// Execute asynchronously so we can select on both it and the context.
var qr *sqltypes.Result
var executeErr error
done := make(chan struct{})
go func() {
defer close(done)
qr, executeErr = conn.ExecuteFetch(query, maxrows, wantfields)
}()
// Wait for either the query or the context to be done.
select {
case <-done:
return qr, executeErr
case <-ctx.Done():
// If both are done already, we may end up here anyway because select
// chooses among multiple ready channels pseudorandomly.
// Check the done channel and prefer that one if it's ready.
select {
case <-done:
return qr, executeErr
default:
}
// The context expired or was cancelled.
// Try to kill the connection to effectively cancel the ExecuteFetch().
connID := conn.ID()
log.Infof("Mysqld.executeFetchContext(): killing connID %v due to timeout of query: %v", connID, query)
if killErr := mysqld.killConnection(connID); killErr != nil {
// Log it, but go ahead and wait for the query anyway.
log.Warningf("Mysqld.executeFetchContext(): failed to kill connID %v: %v", connID, killErr)
}
// Wait for the conn.ExecuteFetch() call to return.
<-done
// Close the connection. Upon Recycle() it will be thrown out.
conn.Close()
// ExecuteFetch() may have succeeded before we tried to kill it.
// If ExecuteFetch() had returned because we cancelled it,
// then executeErr would be an error like "MySQL has gone away".
if executeErr == nil {
return qr, executeErr
}
return nil, ctx.Err()
}
}
func (rqc *RequestContext) execSQLNoPanic(conn dbconnpool.PoolConnection, sql string, wantfields bool) (*mproto.QueryResult, error) {
if qd := rqc.qe.connKiller.SetDeadline(conn.Id(), rqc.deadline); qd != nil {
defer qd.Done()
}
start := time.Now()
result, err := conn.ExecuteFetch(sql, int(rqc.qe.maxResultSize.Get()), wantfields)
rqc.logStats.AddRewrittenSql(sql, start)
if err != nil {
return nil, NewTabletErrorSql(FAIL, err)
}
return result, nil
}
func (qe *QueryEngine) executeSql(logStats *SQLQueryStats, conn dbconnpool.PoolConnection, sql string, wantfields bool) (*mproto.QueryResult, error) {
connid := conn.Id()
qe.activePool.Put(connid)
defer qe.activePool.Remove(connid)
logStats.QuerySources |= QUERY_SOURCE_MYSQL
logStats.NumberOfQueries++
logStats.AddRewrittenSql(sql)
// NOTE(szopa): I am not doing this measurement inside
// conn.ExecuteFetch because that would require changing the
// PoolConnection interface. Same applies to executeStreamSql.
fetchStart := time.Now()
result, err := conn.ExecuteFetch(sql, int(qe.maxResultSize.Get()), wantfields)
logStats.MysqlResponseTime += time.Now().Sub(fetchStart)
if err != nil {
return nil, NewTabletErrorSql(FAIL, err)
}
return result, nil
}
func (mysqld *Mysqld) restoreAfterSnapshot(slaveStartRequired, readOnly bool, hookExtraEnv map[string]string, connToRelease dbconnpool.PoolConnection) (err error) {
// Try to fix mysqld regardless of snapshot success..
log.Infof("exec UNLOCK TABLES")
_, err = connToRelease.ExecuteFetch("UNLOCK TABLES", 10000, false)
connToRelease.Recycle()
if err != nil {
return fmt.Errorf("failed to UNLOCK TABLES: %v", err)
}
// restore original mysqld state that we saved above
if slaveStartRequired {
if err = mysqld.StartSlave(hookExtraEnv); err != nil {
return
}
// this should be quick, but we might as well just wait
if err = mysqld.WaitForSlaveStart(5); err != nil {
return
}
}
if err = mysqld.SetReadOnly(readOnly); err != nil {
return
}
return nil
}