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mysql_engine.go
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mysql_engine.go
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package sqlengine
import (
"database/sql"
"errors"
"fmt"
"github.com/go-sql-driver/mysql" // MySQL Driver
"strings"
"code.cloudfoundry.org/lager"
)
const ER_ACCESS_DENIED_ERROR = 1045
type MySQLEngine struct {
logger lager.Logger
db *sql.DB
requireSSL bool
UsernameGenerator func(string) string
}
func NewMySQLEngine(logger lager.Logger) *MySQLEngine {
return &MySQLEngine{
logger: logger.Session("mysql-engine"),
requireSSL: true,
UsernameGenerator: generateUsername,
}
}
func (d *MySQLEngine) Open(address string, port int64, dbname string, username string, password string) error {
connectionString := d.connectionString(address, port, dbname, username, password)
sanitizedConnectionString := d.connectionString(address, port, dbname, username, "REDACTED")
d.logger.Debug("sql-open", lager.Data{"connection-string": sanitizedConnectionString})
db, err := sql.Open("mysql", connectionString)
if err != nil {
return err
}
d.db = db
// Open() may not actually open the connection so we ping to validate it
err = d.db.Ping()
if err != nil {
// We specifically look for invalid password error and map it to a
// generic error that can be the same across other engines
// See: https://github.com/VividCortex/mysqlerr/blob/master/mysqlerr.go
if mysqlErr, ok := err.(*mysql.MySQLError); ok && mysqlErr.Number == ER_ACCESS_DENIED_ERROR {
return LoginFailedError
}
return err
}
return nil
}
func (d *MySQLEngine) Close() {
if d.db != nil {
d.db.Close()
}
}
func (d *MySQLEngine) CreateUser(bindingID, dbname string, readOnly bool) (username, password string, err error) {
username = d.UsernameGenerator(bindingID)
password = generatePassword()
options := []string{
"SELECT",
"INSERT",
"UPDATE",
"DELETE",
"CREATE",
"DROP",
"REFERENCES",
"INDEX",
"ALTER",
"CREATE TEMPORARY TABLES",
"LOCK TABLES",
"EXECUTE",
"CREATE VIEW",
"SHOW VIEW",
"CREATE ROUTINE",
"ALTER ROUTINE",
"EVENT",
"TRIGGER",
}
var userRequireSSL string
if d.requireSSL {
userRequireSSL = " REQUIRE SSL"
}
createUserStatement := "CREATE USER '" + username + "'@'%' IDENTIFIED BY '" + password + "'" + userRequireSSL + ";"
sanitizedCreateUserStatement := "CREATE USER '" + username + "'@'%' IDENTIFIED BY 'REDACTED'" + userRequireSSL + ";"
d.logger.Debug("create-user", lager.Data{"statement": sanitizedCreateUserStatement})
if _, err := d.db.Exec(createUserStatement); err != nil {
d.logger.Error("sql-error", err)
return "", "", err
}
grantPrivilegesStatement := "GRANT " + strings.Join(options, ", ") + " ON `" + dbname + "`.* TO '" + username + "'@'%';"
d.logger.Debug("grant-privileges", lager.Data{"statement": grantPrivilegesStatement})
if _, err := d.db.Exec(grantPrivilegesStatement); err != nil {
d.logger.Error("sql-error", err)
return "", "", err
}
return username, password, nil
}
func (d *MySQLEngine) DropUser(bindingID string) error {
username := d.UsernameGenerator(bindingID)
dropUserStatement := "DROP USER '" + username + "'@'%';"
d.logger.Debug("drop-user", lager.Data{"statement": dropUserStatement})
_, err := d.db.Exec(dropUserStatement)
if err == nil {
return nil
}
d.logger.Error("sql-error", err)
// Try to drop the username generated the old way
username = generateUsernameOld(bindingID)
dropUserStatement = "DROP USER '" + username + "'@'%';"
d.logger.Debug("drop-user", lager.Data{"statement": dropUserStatement})
_, err = d.db.Exec(dropUserStatement)
if err != nil {
d.logger.Error("sql-error", err)
return err
}
return nil
}
func (d *MySQLEngine) ResetState() error {
// TODO: Not implemented
return errors.New("Not implemented")
}
func (d *MySQLEngine) URI(address string, port int64, dbname string, username string, password string) string {
return fmt.Sprintf("mysql://%s:%s@%s:%d/%s?reconnect=true&useSSL=%t", username, password, address, port, dbname, d.requireSSL)
}
func (d *MySQLEngine) JDBCURI(address string, port int64, dbname string, username string, password string) string {
return fmt.Sprintf("jdbc:mysql://%s:%d/%s?user=%s&password=%s", address, port, dbname, username, password)
}
func (d *MySQLEngine) connectionString(address string, port int64, dbname string, username string, password string) string {
return fmt.Sprintf("%s:%s@tcp(%s:%d)/%s", username, password, address, port, dbname)
}
func (d *MySQLEngine) CreateExtensions(extensions []string) error {
return nil
}
func (d *MySQLEngine) DropExtensions(extensions []string) error {
return nil
}