resolve-local-event-broker/es/publisher-server/broker/resume.js

The reSolve framework's event broker for applications on a local machine.

import { LazinessStrategy, SUBSCRIBERS_TABLE_NAME, SubscriptionStatus, PrivateOperationType } from '../constants';

const resume = async (pool, payload) => {
  const {
    database: {
      runQuery,
      escapeId,
      escapeStr
    },
    invokeOperation,
    parseSubscription
  } = pool;
  const {
    eventSubscriber
  } = payload;
  const subscribersTableNameAsId = escapeId(SUBSCRIBERS_TABLE_NAME);
  const input = {
    type: PrivateOperationType.RESUME_SUBSCRIBER,
    payload: {
      eventSubscriber
    }
  };
  await invokeOperation(pool, LazinessStrategy.EAGER, input);

  for (let attempt = 0;; attempt++) {
    const result = await runQuery(`
      SELECT ${subscribersTableNameAsId}."status" AS "status",
      ${subscribersTableNameAsId}."subscriptionId" AS "subscriptionId"
      FROM ${subscribersTableNameAsId}
      WHERE "eventSubscriber" = ${escapeStr(eventSubscriber)}
    `);

    if (result == null || result.length !== 1) {
      throw new Error(`Event subscriber ${eventSubscriber} does not found`);
    }

    const {
      status,
      subscriptionId
    } = parseSubscription(result[0]);

    if (status === SubscriptionStatus.ERROR) {
      throw new Error(`Event subscriber ${eventSubscriber} is in error state`);
    } else if (status === SubscriptionStatus.DELIVER) {
      return subscriptionId;
    } else if (status === SubscriptionStatus.SKIP && attempt > 10) {
      throw new Error(`Event subscriber ${eventSubscriber} cannot be resumed after ${attempt} attempts - event bus is too busy`);
    } else {
      await new Promise(resolve => setTimeout(resolve, 1000));
    }
  }
};

export default resume;
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