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// SPDX-License-Identifier: GPL-3.0-or-later
package postgres
import (
"fmt"
)
func (p *Postgres) doQueryDatabasesMetrics() error {
if err := p.doQueryDatabaseStats(); err != nil {
return fmt.Errorf("querying database stats error: %v", err)
}
if err := p.doQueryDatabaseSize(); err != nil {
return fmt.Errorf("querying database size error: %v", err)
}
if p.isPGInRecovery() {
if err := p.doQueryDatabaseConflicts(); err != nil {
return fmt.Errorf("querying database conflicts error: %v", err)
}
}
if err := p.doQueryDatabaseLocks(); err != nil {
return fmt.Errorf("querying database locks error: %v", err)
}
return nil
}
func (p *Postgres) doQueryDatabaseStats() error {
q := queryDatabaseStats()
var db string
return p.doQuery(q, func(column, value string, _ bool) {
switch column {
case "datname":
db = value
p.getDBMetrics(db).updated = true
case "numbackends":
p.getDBMetrics(db).numBackends = parseInt(value)
case "datconnlimit":
p.getDBMetrics(db).datConnLimit = parseInt(value)
case "xact_commit":
p.getDBMetrics(db).xactCommit = parseInt(value)
case "xact_rollback":
p.getDBMetrics(db).xactRollback = parseInt(value)
case "blks_read_bytes":
p.getDBMetrics(db).blksRead.last = parseInt(value)
case "blks_hit_bytes":
p.getDBMetrics(db).blksHit.last = parseInt(value)
case "tup_returned":
p.getDBMetrics(db).tupReturned.last = parseInt(value)
case "tup_fetched":
p.getDBMetrics(db).tupFetched.last = parseInt(value)
case "tup_inserted":
p.getDBMetrics(db).tupInserted = parseInt(value)
case "tup_updated":
p.getDBMetrics(db).tupUpdated = parseInt(value)
case "tup_deleted":
p.getDBMetrics(db).tupDeleted = parseInt(value)
case "conflicts":
p.getDBMetrics(db).conflicts = parseInt(value)
case "temp_files":
p.getDBMetrics(db).tempFiles = parseInt(value)
case "temp_bytes":
p.getDBMetrics(db).tempBytes = parseInt(value)
case "deadlocks":
p.getDBMetrics(db).deadlocks = parseInt(value)
}
})
}
func (p *Postgres) doQueryDatabaseSize() error {
q := queryDatabaseSize(p.pgVersion)
var db string
return p.doQuery(q, func(column, value string, _ bool) {
switch column {
case "datname":
db = value
case "size":
p.getDBMetrics(db).size = newInt(parseInt(value))
}
})
}
func (p *Postgres) doQueryDatabaseConflicts() error {
q := queryDatabaseConflicts()
var db string
return p.doQuery(q, func(column, value string, _ bool) {
switch column {
case "datname":
db = value
p.getDBMetrics(db).updated = true
case "confl_tablespace":
p.getDBMetrics(db).conflTablespace = parseInt(value)
case "confl_lock":
p.getDBMetrics(db).conflLock = parseInt(value)
case "confl_snapshot":
p.getDBMetrics(db).conflSnapshot = parseInt(value)
case "confl_bufferpin":
p.getDBMetrics(db).conflBufferpin = parseInt(value)
case "confl_deadlock":
p.getDBMetrics(db).conflDeadlock = parseInt(value)
}
})
}
func (p *Postgres) doQueryDatabaseLocks() error {
q := queryDatabaseLocks()
var db, mode string
var granted bool
return p.doQuery(q, func(column, value string, _ bool) {
switch column {
case "datname":
db = value
p.getDBMetrics(db).updated = true
case "mode":
mode = value
case "granted":
granted = value == "true" || value == "t"
case "locks_count":
// https://github.com/postgres/postgres/blob/7c34555f8c39eeefcc45b3c3f027d7a063d738fc/src/include/storage/lockdefs.h#L36-L45
// https://www.postgresql.org/docs/7.2/locking-tables.html
switch {
case mode == "AccessShareLock" && granted:
p.getDBMetrics(db).accessShareLockHeld = parseInt(value)
case mode == "AccessShareLock":
p.getDBMetrics(db).accessShareLockAwaited = parseInt(value)
case mode == "RowShareLock" && granted:
p.getDBMetrics(db).rowShareLockHeld = parseInt(value)
case mode == "RowShareLock":
p.getDBMetrics(db).rowShareLockAwaited = parseInt(value)
case mode == "RowExclusiveLock" && granted:
p.getDBMetrics(db).rowExclusiveLockHeld = parseInt(value)
case mode == "RowExclusiveLock":
p.getDBMetrics(db).rowExclusiveLockAwaited = parseInt(value)
case mode == "ShareUpdateExclusiveLock" && granted:
p.getDBMetrics(db).shareUpdateExclusiveLockHeld = parseInt(value)
case mode == "ShareUpdateExclusiveLock":
p.getDBMetrics(db).shareUpdateExclusiveLockAwaited = parseInt(value)
case mode == "ShareLock" && granted:
p.getDBMetrics(db).shareLockHeld = parseInt(value)
case mode == "ShareLock":
p.getDBMetrics(db).shareLockAwaited = parseInt(value)
case mode == "ShareRowExclusiveLock" && granted:
p.getDBMetrics(db).shareRowExclusiveLockHeld = parseInt(value)
case mode == "ShareRowExclusiveLock":
p.getDBMetrics(db).shareRowExclusiveLockAwaited = parseInt(value)
case mode == "ExclusiveLock" && granted:
p.getDBMetrics(db).exclusiveLockHeld = parseInt(value)
case mode == "ExclusiveLock":
p.getDBMetrics(db).exclusiveLockAwaited = parseInt(value)
case mode == "AccessExclusiveLock" && granted:
p.getDBMetrics(db).accessExclusiveLockHeld = parseInt(value)
case mode == "AccessExclusiveLock":
p.getDBMetrics(db).accessExclusiveLockAwaited = parseInt(value)
}
}
})
}
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