co.rsk.net.discovery.message.NeighborsPeerMessage.java Source code

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Here is the source code for co.rsk.net.discovery.message.NeighborsPeerMessage.java

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/*
 * This file is part of RskJ
 * Copyright (C) 2017 RSK Labs Ltd.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package co.rsk.net.discovery.message;

import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.ethereum.crypto.ECKey;
import org.ethereum.net.rlpx.Node;
import org.ethereum.util.RLP;
import org.ethereum.util.RLPItem;
import org.ethereum.util.RLPList;

import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;

/**
 * Created by mario on 16/02/17.
 */
public class NeighborsPeerMessage extends PeerDiscoveryMessage {

    private List<Node> nodes;
    private String messageId;

    public NeighborsPeerMessage(byte[] wire, byte[] mdc, byte[] signature, byte[] type, byte[] data) {
        super(wire, mdc, signature, type, data);
        this.parse(data);
    }

    private NeighborsPeerMessage() {
    }

    @Override
    public final void parse(byte[] data) {
        RLPList list = (RLPList) RLP.decode2OneItem(data, 0);

        RLPList nodesRLP = (RLPList) list.get(0);
        nodes = new ArrayList<>();

        for (int i = 0; i < nodesRLP.size(); ++i) {
            RLPList nodeRLP = (RLPList) nodesRLP.get(i);
            Node node = new Node(nodeRLP.getRLPData());
            nodes.add(node);
        }
        RLPItem chk = (RLPItem) list.get(1);
        this.messageId = new String(chk.getRLPData(), Charset.forName("UTF-8"));

    }

    public static NeighborsPeerMessage create(List<Node> nodes, String check, ECKey privKey) {

        byte[][] nodeRLPs = null;

        if (nodes != null) {
            nodeRLPs = new byte[nodes.size()][];
            int i = 0;
            for (Node node : nodes) {
                nodeRLPs[i] = node.getRLP();
                ++i;
            }
        }

        byte[] rlpListNodes = RLP.encodeList(nodeRLPs);
        byte[] rlpCheck = RLP.encodeElement(check.getBytes(StandardCharsets.UTF_8));

        byte[] type = new byte[] { (byte) DiscoveryMessageType.NEIGHBORS.getTypeValue() };
        byte[] data = RLP.encodeList(rlpListNodes, rlpCheck);

        NeighborsPeerMessage neighborsMessage = new NeighborsPeerMessage();
        neighborsMessage.encode(type, data, privKey);
        neighborsMessage.nodes = nodes;
        neighborsMessage.messageId = check;

        return neighborsMessage;
    }

    public List<Node> getNodes() {
        return nodes;
    }

    public String getMessageId() {
        return this.messageId;
    }

    @Override
    public DiscoveryMessageType getMessageType() {
        return DiscoveryMessageType.NEIGHBORS;
    }

    public int countNodes() {
        return CollectionUtils.size(this.nodes);
    }

    @Override
    public String toString() {
        return new ToStringBuilder(this).append(this.nodes).append(this.messageId).toString();
    }

}