firehol/netdata

// 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)
            }
        }
    })
}