@libp2p/peer-store/dist/src/utils/dedupe-addresses.js

Stores information about peers libp2p knows on the network

import { InvalidParametersError } from '@libp2p/interface';
import { isMultiaddr, multiaddr } from '@multiformats/multiaddr';
export async function dedupeFilterAndSortAddresses(peerId, filter, addresses, existingAddresses) {
    const addressMap = new Map();
    for (const addr of addresses) {
        if (addr == null) {
            continue;
        }
        if (addr.multiaddr instanceof Uint8Array) {
            addr.multiaddr = multiaddr(addr.multiaddr);
        }
        if (!isMultiaddr(addr.multiaddr)) {
            throw new InvalidParametersError('Multiaddr was invalid');
        }
        if (!(await filter(peerId, addr.multiaddr))) {
            continue;
        }
        const isCertified = addr.isCertified ?? false;
        const maStr = addr.multiaddr.toString();
        const existingAddr = addressMap.get(maStr);
        if (existingAddr != null) {
            addr.isCertified = existingAddr.isCertified || isCertified;
        }
        else {
            addressMap.set(maStr, {
                multiaddr: addr.multiaddr,
                isCertified
            });
        }
    }
    return [...addressMap.values()]
        .sort((a, b) => {
        return a.multiaddr.toString().localeCompare(b.multiaddr.toString());
    })
        .map(({ isCertified, multiaddr }) => ({
        isCertified,
        multiaddr: multiaddr.bytes
    }));
}
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