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

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

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

const resumeSubscriber = async (pool, payload) => {
  const {
    database: {
      escapeId,
      escapeStr,
      runQuery,
      runRawQuery
    },
    invokeOperation,
    generateGuid
  } = pool;
  const {
    eventSubscriber,
    conditionalResume
  } = payload;
  const notificationsTableNameAsId = escapeId(NOTIFICATIONS_TABLE_NAME);
  const subscribersTableNameAsId = escapeId(SUBSCRIBERS_TABLE_NAME);
  const insertionId = generateGuid('FORCEUPDATE');
  await runRawQuery(`
      UPDATE ${subscribersTableNameAsId}
      SET "status" = ${escapeStr(SubscriptionStatus.DELIVER)}
      WHERE "eventSubscriber" = ${escapeStr(eventSubscriber)}
      AND ${conditionalResume ? `"status" = ${escapeStr(SubscriptionStatus.DELIVER)}` : `"status" <> ${escapeStr(SubscriptionStatus.ERROR)}`};

      INSERT INTO ${notificationsTableNameAsId}(
        "insertionId",
        "subscriptionId",
        "incomingTimestamp",
        "processStartTimestamp",
        "processEndTimestamp",
        "heartbeatTimestamp",
        "aggregateIdAndVersion",
        "status"
      ) SELECT 
        ${escapeStr(insertionId)} AS "insertionId",
        "subscriptionIds"."subscriptionId" AS "subscriptionId",
        CAST(strftime('%s','now') || substr(strftime('%f','now'),4) AS ${LONG_INTEGER_SQL_TYPE}) AS "incomingTimestamp",
        NULL AS "processStartTimestamp",
        NULL AS "processEndTimestamp",
        NULL AS "heartbeatTimestamp",
        ${escapeStr('FORCEUPDATE')} AS "aggregateIdAndVersion",
        ${escapeStr(NotificationStatus.RECIEVED)} AS "status"
      FROM (
        SELECT ${subscribersTableNameAsId}."subscriptionId"
        FROM ${subscribersTableNameAsId}
        WHERE "eventSubscriber" = ${escapeStr(eventSubscriber)}
        AND "status" = ${escapeStr(SubscriptionStatus.DELIVER)}
        AND "deliveryStrategy" <> ${escapeStr(DeliveryStrategy.PASSTHROUGH)}
      ) "subscriptionIds";

      COMMIT;
      BEGIN IMMEDIATE;
    `);
  const result = await runQuery(`
      SELECT ${subscribersTableNameAsId}."subscriptionId",
      ${subscribersTableNameAsId}."status"
      FROM ${subscribersTableNameAsId}
      WHERE "eventSubscriber" = ${escapeStr(eventSubscriber)}
      AND (
        "status" = ${escapeStr(SubscriptionStatus.DELIVER)} OR
        "status" = ${escapeStr(SubscriptionStatus.SKIP)}
      )
  `);

  if (result == null || result.length !== 1) {
    throw new Error(`Notification for event subscriber ${eventSubscriber} cannot be pushed`);
  }

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

  if (status === SubscriptionStatus.DELIVER) {
    const input = {
      type: PrivateOperationType.PULL_NOTIFICATIONS,
      payload: {
        subscriptionId
      }
    };
    await invokeOperation(pool, LazinessStrategy.EAGER, input);
  }
};

export default resumeSubscriber;
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