func fetchStatDatabase(db *sqlx.DB) (map[string]interface{}, error) {
db = db.Unsafe()
rows, err := db.Queryx(`SELECT * FROM pg_stat_database`)
if err != nil {
logger.Errorf("Failed to select pg_stat_database. %s", err)
return nil, err
}
type pgStat struct {
XactCommit uint64 `db:"xact_commit"`
XactRollback uint64 `db:"xact_rollback"`
BlksRead uint64 `db:"blks_read"`
BlksHit uint64 `db:"blks_hit"`
BlkReadTime *float64 `db:"blk_read_time"`
BlkWriteTime *float64 `db:"blk_write_time"`
TupReturned uint64 `db:"tup_returned"`
TupFetched uint64 `db:"tup_fetched"`
TupInserted uint64 `db:"tup_inserted"`
TupUpdated uint64 `db:"tup_updated"`
TupDeleted uint64 `db:"tup_deleted"`
Deadlocks *uint64 `db:"deadlocks"`
TempBytes *uint64 `db:"temp_bytes"`
}
totalStat := pgStat{}
for rows.Next() {
p := pgStat{}
if err := rows.StructScan(&p); err != nil {
logger.Warningf("Failed to scan. %s", err)
continue
}
totalStat.XactCommit += p.XactCommit
totalStat.XactRollback += p.XactRollback
totalStat.BlksRead += p.BlksRead
totalStat.BlksHit += p.BlksHit
if p.BlkReadTime != nil {
if totalStat.BlkReadTime == nil {
totalStat.BlkReadTime = p.BlkReadTime
} else {
*totalStat.BlkReadTime += *p.BlkReadTime
}
}
if p.BlkWriteTime != nil {
if totalStat.BlkWriteTime == nil {
totalStat.BlkWriteTime = p.BlkWriteTime
} else {
*totalStat.BlkWriteTime += *p.BlkWriteTime
}
}
totalStat.TupReturned += p.TupReturned
totalStat.TupFetched += p.TupFetched
totalStat.TupInserted += p.TupInserted
totalStat.TupUpdated += p.TupUpdated
totalStat.TupDeleted += p.TupDeleted
if p.Deadlocks != nil {
if totalStat.Deadlocks == nil {
totalStat.Deadlocks = p.Deadlocks
} else {
*totalStat.Deadlocks += *p.Deadlocks
}
}
if p.TempBytes != nil {
if totalStat.TempBytes == nil {
totalStat.TempBytes = p.TempBytes
} else {
*totalStat.TempBytes += *p.TempBytes
}
}
}
stat := make(map[string]interface{})
stat["xact_commit"] = totalStat.XactCommit
stat["xact_rollback"] = totalStat.XactRollback
stat["blks_read"] = totalStat.BlksRead
stat["blks_hit"] = totalStat.BlksHit
if totalStat.BlkReadTime != nil {
stat["blk_read_time"] = *totalStat.BlkReadTime
}
if totalStat.BlkWriteTime != nil {
stat["blk_write_time"] = *totalStat.BlkWriteTime
}
stat["tup_returned"] = totalStat.TupReturned
stat["tup_fetched"] = totalStat.TupFetched
stat["tup_inserted"] = totalStat.TupInserted
stat["tup_updated"] = totalStat.TupUpdated
stat["tup_deleted"] = totalStat.TupDeleted
if totalStat.Deadlocks != nil {
stat["deadlocks"] = *totalStat.Deadlocks
}
if totalStat.TempBytes != nil {
stat["temp_bytes"] = *totalStat.TempBytes
}
return stat, nil
}