rbt_mssql-pool-party/dist/race-warmup-strategy.js

Extension of mssql that provides management of multiple connection pools, dsns, retries, and more

"use strict";var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");Object.defineProperty(exports, "__esModule", { value: true });exports["default"] = raceWarmupStrategy;var _debug = _interopRequireDefault(require("debug"));

var debug = (0, _debug["default"])('mssql-pool-party');

function rejectIfNoRemainingPools(reject, processed, total, resolved) {
  if (processed >= total && !resolved) {
    debug('warmup: failed, no pools healthy pools created');
    reject(new Error("\n      The connectionPoolFactory failed to create any pool(s) using\n      the dsn(s) provided. Warmup has failed.\n    "));



  }
}

// The raceWarmupStrategy attempts to create connection pools in parallel.
// The first to succeed will resolve the promise, signaling that the warmup is done.
// If there is more than one dsn, pools will be created for the rest in the background
// and added to the ConnectionPoolParty pools collection as they are created.
function raceWarmupStrategy(dsns, connectionPoolFactory, onCreation, onError) {
  // have we successfully created a pool?
  var resolved = false;
  // the number of pools we've created/failed
  var numberProcessed = 0;

  return new Promise(function (resolve, reject) {
    // for each dsn, create a pool
    dsns.forEach(function (dsn) {
      connectionPoolFactory(dsn).
      then(
      // if we succeed in creating a pool, pass it to onCreation
      // and resolve if we haven't already done so
      function (pool) {
        numberProcessed += 1;
        debug('warmup: pool %d created %s%O', numberProcessed, pool.error && 'WITH ERROR\n' || '', pool.error);
        onCreation(pool);
        // we only want to resolve once
        if (!resolved && !pool.error) {
          resolved = true;
          debug('warmup: resolved');
          resolve();
        }
        rejectIfNoRemainingPools(reject, numberProcessed, dsns.length, resolved);
      },
      // normally, connectionPoolFactory should never reject,
      // since we want it to create a pool even if it's unhealthy,
      // so we can attempt to heal the pool later
      function (err) {
        numberProcessed += 1;
        debug('warmup: connectionPoolFactory errored');
        onError(err);
        rejectIfNoRemainingPools(reject, numberProcessed, dsns.length, resolved);
      });

    });
  });
}module.exports = exports.default;
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