com.bitsofproof.supernode.core.DNSDiscovery.java Source code

Introduction

Here is the source code for com.bitsofproof.supernode.core.DNSDiscovery.java

Source

/*
 * Copyright 2013 bits of proof zrt.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.bitsofproof.supernode.core;

import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;

public class DNSDiscovery implements Discovery {
    private static final Logger log = LoggerFactory.getLogger(BitcoinNetwork.class);
    private String[] seedHosts;

    @Autowired
    Chain chain;

    @Override
    public List<InetSocketAddress> discover() {
        log.trace("Discovering network using DNS seed");
        int n = 0;
        List<InetSocketAddress> al = new ArrayList<InetSocketAddress>();
        for (String hostName : seedHosts) {
            log.trace("Obtain addresses from " + hostName);
            InetAddress[] hostAddresses;
            try {
                hostAddresses = InetAddress.getAllByName(hostName);
                for (InetAddress inetAddress : hostAddresses) {
                    al.add(new InetSocketAddress(inetAddress, chain.getPort()));
                    ++n;
                }
            } catch (UnknownHostException e) {
            }
        }
        Collections.shuffle(al);
        log.trace("Found " + n + " addresses of seed hosts");
        return al;
    }

    public String[] getSeedHosts() {
        return seedHosts;
    }

    public void setSeedHosts(String[] seedHosts) {
        this.seedHosts = seedHosts;
    }

}