resolve-runtime/es/utils/create_pubsub_manager.js

This package create server with resolve.

const createPubsubManager = () => {
  const map = new Map();
  const pubsubManager = {
    subscribe({
      client,
      topicName,
      topicId
    }) {
      if (!map.has(topicName)) {
        map.set(topicName, new Map());
      }

      if (!map.get(topicName).has(topicId)) {
        map.get(topicName).set(topicId, []);
      }

      map.get(topicName).get(topicId).push(client);
    },

    unsubscribe({
      client,
      topicName,
      topicId
    }) {
      if (!map.has(topicName)) {
        return;
      }

      if (!map.get(topicName).has(topicId)) {
        return;
      }

      const clients = map.get(topicName).get(topicId);
      const idx = clients.findIndex(cl => client === cl);
      clients.splice(idx, 1);

      if (clients.length === 0) {
        map.get(topicName).delete(topicId);
      }

      if (map.get(topicName).size === 0) {
        map.delete(topicName);
      }
    },

    unsubscribeClient(client) {
      for (const topicName of map.keys()) {
        for (const topicId of map.get(topicName).keys()) {
          const clients = map.get(topicName).get(topicId);
          const idx = clients.findIndex(cl => client === cl);

          if (idx >= 0) {
            clients.splice(idx, 1);
          }
        }
      }
    },

    dispatch({
      topicName,
      topicId,
      event
    }) {
      const clients = [];

      if (map.has(topicName) && map.get(topicName).has(topicId)) {
        clients.push(...map.get(topicName).get(topicId));
      }

      if (map.has(topicName) && map.get(topicName).has('+')) {
        clients.push(...map.get(topicName).get('+'));
      }

      if (map.has('+') && map.get('+').has(topicId)) {
        clients.push(...map.get('+').get(topicId));
      }

      if (map.has('+') && map.get('+').has('+')) {
        clients.push(...map.get('+').get('+'));
      }

      clients.forEach(client => client(topicName, topicId, event).catch(warning => {
        resolveLog('warn', 'PubSub manager caused warning from client', warning);
      }));
    }

  };
  return pubsubManager;
};

export default createPubsubManager;
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