// writePoolInstances will write (and override) a single cluster name mapping
func writePoolInstances(pool string, instanceKeys [](*InstanceKey)) error {
writeFunc := func() error {
db, err := db.OpenOrchestrator()
if err != nil {
return log.Errore(err)
}
tx, err := db.Begin()
stmt, err := tx.Prepare(`delete from database_instance_pool where pool = ?`)
_, err = stmt.Exec(pool)
if err != nil {
tx.Rollback()
return log.Errore(err)
}
stmt, err = tx.Prepare(`insert into database_instance_pool (hostname, port, pool, registered_at) values (?, ?, ?, now())`)
for _, instanceKey := range instanceKeys {
_, err := stmt.Exec(instanceKey.Hostname, instanceKey.Port, pool)
if err != nil {
tx.Rollback()
return log.Errore(err)
}
}
if err != nil {
tx.Rollback()
return log.Errore(err)
}
tx.Commit()
return nil
}
return ExecDBWriteFunc(writeFunc)
}
// EmptyCommitInstance issues an empty COMMIT on a given instance
func EmptyCommitInstance(instanceKey *InstanceKey) error {
db, err := db.OpenTopology(instanceKey.Hostname, instanceKey.Port)
if err != nil {
return err
}
tx, err := db.Begin()
if err != nil {
return err
}
err = tx.Commit()
if err != nil {
return err
}
return err
}