logos-messaging-js/packages/core/src/lib/base_protocol.ts

import type { Libp2p } from "@libp2p/interface";
import type { Peer, Stream } from "@libp2p/interface";
import type {
  IBaseProtocolCore,
  Libp2pComponents,
  PubsubTopic
} from "@waku/interfaces";

import { StreamManager } from "./stream_manager/index.js";

/**
 * A class with predefined helpers, to be used as a base to implement Waku
 * Protocols.
 */
export class BaseProtocol implements IBaseProtocolCore {
  public readonly addLibp2pEventListener: Libp2p["addEventListener"];
  public readonly removeLibp2pEventListener: Libp2p["removeEventListener"];
  protected streamManager: StreamManager;

  protected constructor(
    public multicodec: string,
    protected components: Libp2pComponents,
    public readonly pubsubTopics: PubsubTopic[]
  ) {
    this.addLibp2pEventListener = components.events.addEventListener.bind(
      components.events
    );
    this.removeLibp2pEventListener = components.events.removeEventListener.bind(
      components.events
    );

    this.streamManager = new StreamManager(
      multicodec,
      components.connectionManager.getConnections.bind(
        components.connectionManager
      ),
      this.addLibp2pEventListener
    );
  }

  protected async getStream(peer: Peer): Promise<Stream> {
    return this.streamManager.getStream(peer);
  }
}