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db_state_snapshotter.go
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/
db_state_snapshotter.go
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package healthcheck
import (
"database/sql"
"code.cloudfoundry.org/lager"
"github.com/cloudfoundry-incubator/galera-healthcheck/domain"
)
type DBStateSnapshotter struct {
DB *sql.DB
Logger lager.Logger
}
func (s *DBStateSnapshotter) State() (state domain.DBState, err error) {
tx, err := s.DB.Begin()
if err != nil {
return domain.DBState{}, err
}
defer func() {
if err != nil {
tx.Rollback()
return
}
err = tx.Commit()
}()
var (
unused string
localState domain.WsrepLocalState
localIndex uint
readOnly string
)
err = tx.QueryRow("SHOW STATUS LIKE 'wsrep_local_state'").Scan(&unused, &localState)
if err != nil {
return
}
err = tx.QueryRow("SHOW STATUS LIKE 'wsrep_local_index'").Scan(&unused, &localIndex)
if err != nil {
return
}
err = tx.QueryRow("SHOW GLOBAL VARIABLES LIKE 'read_only'").Scan(&unused, &readOnly)
if err != nil {
return
}
return domain.DBState{
WsrepLocalIndex: localIndex,
WsrepLocalState: localState,
ReadOnly: (readOnly == "ON"),
}, nil
}