@clickup/pg-microsharding/dist/internal/getPhysicalReplicas.js

Microshards support for PostgreSQL

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.getPhysicalReplicas = getPhysicalReplicas;
const parseLsn_1 = require("./parseLsn");
const quote_1 = require("./quote");
const runSql_1 = require("./runSql");
/**
 * Returns detailed information about physical replicas of a DSN. Works for
 * vanilla PostgreSQL only: in Aurora, it returns an empty array.
 */
async function getPhysicalReplicas({ dsn, comment, }) {
    const replicas = await (0, runSql_1.runSql)(dsn, (0, quote_1.sql) `
      SELECT
        pid,
        client_addr,
        usename,
        application_name,
        EXTRACT(EPOCH FROM replay_lag),
        EXTRACT(EPOCH FROM (now() - reply_time)),
        sent_lsn,
        replay_lsn
      FROM pg_stat_replication
      WHERE
        application_name = 'walreceiver'
        OR pid IN (SELECT active_pid FROM pg_replication_slots WHERE slot_type = 'physical')
    `, comment);
    return replicas.map(([pid, clientAddr, userName, applicationName, lagSec, feedbackAgoSec, masterLsn, replicaLsn,]) => ({
        pid,
        clientAddr,
        userName,
        applicationName,
        // "If the standby server has entirely caught up with the sending server
        // and there is no more WAL activity, the most recently measured lag times
        // will continue to be displayed for a short time and then show NULL."
        lagSec: lagSec ? Math.round(parseFloat(lagSec)) : 0,
        feedbackAgoSec: feedbackAgoSec !== "" ? Math.round(parseFloat(feedbackAgoSec)) : null,
        masterLsn: (0, parseLsn_1.isLsn)(masterLsn) ? masterLsn : null,
        replicaLsn: (0, parseLsn_1.isLsn)(replicaLsn) ? replicaLsn : null,
        gap: (0, parseLsn_1.subtractLsn)(masterLsn, replicaLsn),
    }));
}
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