@waku/discovery/dist/dns/fetch_nodes.js

Contains various discovery mechanisms: DNS Discovery (EIP-1459, Peer Exchange, Local Peer Cache Discovery.

import { Logger } from "@waku/utils";
const log = new Logger("discovery:fetch_nodes");
/**
 * Fetch nodes using passed [[getNode]] until it has been called [[maxGet]]
 * times, or it has returned empty or duplicate results more than [[maxErrors]]
 * times.
 */
export async function* fetchNodes(getNode, maxGet = 10, maxErrors = 3) {
    const peerNodeIds = new Set();
    let totalSearches = 0;
    let erroneousSearches = 0;
    while (totalSearches < maxGet &&
        erroneousSearches < maxErrors // Allows a couple of empty results before calling it quit
    ) {
        totalSearches++;
        const peer = await getNode();
        if (!peer || !peer.nodeId) {
            erroneousSearches++;
            continue;
        }
        if (!peerNodeIds.has(peer.nodeId)) {
            peerNodeIds.add(peer.nodeId);
            // ENRs without a waku2 key are ignored.
            if (peer.waku2) {
                yield peer;
            }
            log.info(`got new peer candidate from DNS address=${peer.nodeId}@${peer.ip}`);
        }
    }
}
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