resolve-local-event-broker/es/publisher-server/core/pull-notifications-as-batch-for-subscriber.js

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

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

const pullNotificationsAsBatchForSubscriber = async (pool, payload) => {
  const {
    database: {
      escapeStr,
      escapeId,
      runQuery,
      runRawQuery
    },
    parseSubscription,
    invokeOperation,
    generateGuid
  } = pool;
  const {
    subscriptionId
  } = payload;
  const notificationsTableNameAsId = escapeId(NOTIFICATIONS_TABLE_NAME);
  const subscribersTableNameAsId = escapeId(SUBSCRIBERS_TABLE_NAME);
  const batchId = generateGuid(subscriptionId);
  await runRawQuery(`
      UPDATE ${notificationsTableNameAsId} SET
      "processStartTimestamp" = CAST(strftime('%s','now') || substr(strftime('%f','now'),4) AS ${LONG_INTEGER_SQL_TYPE}),
      "heartbeatTimestamp" = CAST(strftime('%s','now') || substr(strftime('%f','now'),4) AS ${LONG_INTEGER_SQL_TYPE}),
      "batchId" = ${escapeStr(batchId)}
      WHERE ${notificationsTableNameAsId}."subscriptionId" = ${escapeStr(subscriptionId)}
      AND NOT EXISTS (
        SELECT "N".* FROM ${notificationsTableNameAsId} "N"
        WHERE "N"."subscriptionId" = ${escapeStr(subscriptionId)}
        AND "N"."batchId" IS NOT NULL
      )
      AND EXISTS (
        SELECT "S".* FROM ${subscribersTableNameAsId} "S"
        WHERE "S"."subscriptionId" = ${escapeStr(subscriptionId)}
      );

      COMMIT;
      BEGIN IMMEDIATE;
    `);
  const affectedNotifications = await runQuery(`
      SELECT ${subscribersTableNameAsId}."subscriptionId" AS "subscriptionId",
      ${subscribersTableNameAsId}."eventSubscriber" AS "eventSubscriber"
      FROM ${notificationsTableNameAsId} LEFT JOIN ${subscribersTableNameAsId} ON
      ${subscribersTableNameAsId}."subscriptionId" = ${notificationsTableNameAsId}."subscriptionId"
      WHERE ${subscribersTableNameAsId}."subscriptionId" =
      ${escapeStr(subscriptionId)}
      AND  ${notificationsTableNameAsId}."batchId" = 
      ${escapeStr(batchId)}
      LIMIT 1
    `);

  if (affectedNotifications == null || affectedNotifications.length < 1) {
    return;
  }

  const activeBatch = await parseSubscription({ ...affectedNotifications[0],
    batchId
  });
  const input = {
    type: PrivateOperationType.DELIVER_BATCH,
    payload: {
      activeBatch
    }
  };
  await invokeOperation(pool, LazinessStrategy.EAGER, input);
};

export default pullNotificationsAsBatchForSubscriber;
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