foreign/node/src/wire/topic/ensure-topic.virtual.command.ts

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// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
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//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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import type { Id } from '../identifier.utils.js';
import type { ClientProvider } from '../../client/index.js';
import { createTopic } from './create-topic.command.js';
import { getTopic } from './get-topic.command.js';


/**
 * Creates a virtual command that ensures a topic exists.
 * If the topic does not exist, it will be created with default settings.
 *
 * @param c - Client provider function
 * @returns Function that ensures a topic exists by name
 */
export const ensureTopic = (c: ClientProvider) =>
  async function ensureTopic(
    streamId: Id,
    topicName: string,
    partitionCount = 1,
    compressionAlgorithm = 1
  ) {
    const topic = await getTopic(c)({ streamId, topicId: topicName });
    return topic === null ?
      createTopic(c)({
        streamId, name: topicName, partitionCount, compressionAlgorithm
      }) : topic;
  };