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query.go
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query.go
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// Copyright 2014, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package mysqlctl
import (
"fmt"
"strings"
"time"
log "github.com/golang/glog"
"github.com/youtube/vitess/go/sqldb"
"github.com/youtube/vitess/go/sqltypes"
"github.com/youtube/vitess/go/vt/dbconnpool"
)
// getPoolReconnect gets a connection from a pool, tests it, and reconnects if
// it gets errno 2006.
func getPoolReconnect(pool *dbconnpool.ConnectionPool, timeout time.Duration) (dbconnpool.PoolConnection, error) {
conn, err := pool.Get(timeout)
if err != nil {
return conn, err
}
// Run a test query to see if this connection is still good.
if _, err := conn.ExecuteFetch("SELECT 1", 1, false); err != nil {
// If we get "MySQL server has gone away (errno 2006)", try to reconnect.
if sqlErr, ok := err.(*sqldb.SQLError); ok && sqlErr.Number() == 2006 {
if err := conn.Reconnect(); err != nil {
conn.Recycle()
return conn, err
}
}
}
return conn, nil
}
// ExecuteSuperQuery allows the user to execute a query as a super user.
func (mysqld *Mysqld) ExecuteSuperQuery(query string) error {
return mysqld.ExecuteSuperQueryList([]string{query})
}
// ExecuteSuperQueryList alows the user to execute queries as a super user.
func (mysqld *Mysqld) ExecuteSuperQueryList(queryList []string) error {
conn, connErr := getPoolReconnect(mysqld.dbaPool, 0)
if connErr != nil {
return connErr
}
defer conn.Recycle()
for _, query := range queryList {
log.Infof("exec %v", redactMasterPassword(query))
if _, err := conn.ExecuteFetch(query, 10000, false); err != nil {
return fmt.Errorf("ExecuteFetch(%v) failed: %v", redactMasterPassword(query), err.Error())
}
}
return nil
}
// FetchSuperQuery returns the results of executing a query as a super user.
func (mysqld *Mysqld) FetchSuperQuery(query string) (*sqltypes.Result, error) {
conn, connErr := getPoolReconnect(mysqld.dbaPool, 0)
if connErr != nil {
return nil, connErr
}
defer conn.Recycle()
log.V(6).Infof("fetch %v", query)
qr, err := conn.ExecuteFetch(query, 10000, true)
if err != nil {
return nil, err
}
return qr, nil
}
// fetchSuperQueryMap returns a map from column names to cell data for a query
// that should return exactly 1 row.
func (mysqld *Mysqld) fetchSuperQueryMap(query string) (map[string]string, error) {
qr, err := mysqld.FetchSuperQuery(query)
if err != nil {
return nil, err
}
if len(qr.Rows) != 1 {
return nil, fmt.Errorf("query %#v returned %d rows, expected 1", query, len(qr.Rows))
}
if len(qr.Fields) != len(qr.Rows[0]) {
return nil, fmt.Errorf("query %#v returned %d column names, expected %d", query, len(qr.Fields), len(qr.Rows[0]))
}
rowMap := make(map[string]string, len(qr.Rows[0]))
for i, value := range qr.Rows[0] {
rowMap[qr.Fields[i].Name] = value.String()
}
return rowMap, nil
}
// fetchVariables returns a map from MySQL variable names to variable value
// for variables that match the given pattern.
func (mysqld *Mysqld) fetchVariables(pattern string) (map[string]string, error) {
query := fmt.Sprintf("SHOW VARIABLES LIKE '%s'", pattern)
qr, err := mysqld.FetchSuperQuery(query)
if err != nil {
return nil, err
}
if len(qr.Fields) != 2 {
return nil, fmt.Errorf("query %#v returned %d columns, expected 2", query, len(qr.Fields))
}
varMap := make(map[string]string, len(qr.Rows))
for _, row := range qr.Rows {
varMap[row[0].String()] = row[1].String()
}
return varMap, nil
}
const masterPasswordStart = " MASTER_PASSWORD = '"
const masterPasswordEnd = "',\n"
func redactMasterPassword(input string) string {
i := strings.Index(input, masterPasswordStart)
if i == -1 {
return input
}
j := strings.Index(input[i+len(masterPasswordStart):], masterPasswordEnd)
if j == -1 {
return input
}
return input[:i+len(masterPasswordStart)] + strings.Repeat("*", j) + input[i+len(masterPasswordStart)+j:]
}