Current File : //home/waritko/yacy/source/net/yacy/cora/federate/yacy/api/Network.java
/**
* Peers
* Copyright 2012 by Michael Peter Christen, mc@yacy.net, Frankfurt am Main, Germany
* First released 21.09.2012 at http://yacy.net
*
* This library 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 2.1 of the License, or (at your option) any later version.
*
* This library 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 in the file lgpl21.txt
* If not, see <http://www.gnu.org/licenses/>.
*/
package net.yacy.cora.federate.yacy.api;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import net.yacy.cora.federate.yacy.Peer;
import net.yacy.cora.federate.yacy.Peers;
import net.yacy.cora.protocol.ClientIdentification;
import net.yacy.cora.protocol.http.HTTPClient;
/**
* discover all peers in the network when only one peer is known.
* this works only for a limited number of peers, not more than some thousands
*/
public class Network {
/**
* get the list of peers from one peer
* @param address
* @return a network as list of peers
* @throws IOException
*/
public static Peers getNetwork(final String address) throws IOException {
Peers peers = new Peers();
final HTTPClient httpclient = new HTTPClient(ClientIdentification.yacyInternetCrawlerAgent);
final byte[] content = httpclient.GETbytes("http://" + address + "/Network.xml?page=1&maxCount=1000&ip=", null, null, false);
ByteArrayInputStream bais = new ByteArrayInputStream(content);
Document doc = null;
try {
doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(bais);
} catch (final Throwable e) {
throw new IOException(e.getMessage());
}
bais.close();
doc.getDocumentElement().normalize();
NodeList objects = doc.getElementsByTagName("peer");
for (int i = 0; i < objects.getLength(); i++) {
Node object = objects.item(i);
if (object.getNodeType() == Node.ELEMENT_NODE) {
Element element = (Element) object;
Peer peer = new Peer();
for (Peer.Schema attr: Peer.Schema.values()) {
peer.put(attr, getAttr(attr.name(), element));
}
peers.add(peer);
//log.info(peer.toString());
}
}
return peers;
}
private static String getAttr(String attr, Element eElement) {
NodeList nl0 = eElement.getElementsByTagName(attr);
if (nl0 == null) return "";
Node n0 = nl0.item(0);
if (n0 == null) return "";
NodeList nl1 = n0.getChildNodes();
if (nl1 == null) return "";
Node n1 = nl1.item(0);
if (n1 == null) return "";
return n1.getNodeValue();
}
public static void main(String[] args) {
//getNetwork("search.yacy.net");
try {getNetwork("sokrates.homeunix.net:9090");} catch (final IOException e1) {}
try {HTTPClient.closeConnectionManager();} catch (final InterruptedException e) {}
}
}
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