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

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

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

const pause = async (pool, payload) => {
  const {
    database: {
      runQuery,
      runRawQuery,
      escapeId,
      escapeStr
    },
    parseSubscription
  } = pool;
  const subscribersTableNameAsId = escapeId(SUBSCRIBERS_TABLE_NAME);
  await runRawQuery(`
      UPDATE ${subscribersTableNameAsId}
      SET "status" = ${escapeStr(SubscriptionStatus.SKIP)}
      WHERE "eventSubscriber" = ${escapeStr(payload.eventSubscriber)}
      AND "status" <> ${escapeStr(SubscriptionStatus.ERROR)};

      COMMIT;
      BEGIN IMMEDIATE;
    `);
  const result = await runQuery(`
      SELECT * FROM ${subscribersTableNameAsId}
      WHERE ${subscribersTableNameAsId}."eventSubscriber" =
      ${escapeStr(payload.eventSubscriber)}
    `);

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

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

  if (status === SubscriptionStatus.ERROR) {
    throw new Error(`Event subscriber ${payload.eventSubscriber} is in error state`);
  }

  return subscriptionId;
};

export default pause;
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