/*
* Copyright 2011 Google Inc.
*
* 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.google.feathercoin.examples;
import com.google.feathercoin.core.*;
import com.google.feathercoin.store.BlockStore;
import com.google.feathercoin.store.MemoryBlockStore;
import com.google.feathercoin.utils.BriefLogFormatter;
import java.net.InetAddress;
import java.util.concurrent.Future;
/**
* Downloads the block given a block hash from the localhost node and prints it out.
*/
public class FetchBlock {
public static void main(String[] args) throws Exception {
BriefLogFormatter.init();
System.out.println("Connecting to node");
final NetworkParameters params = NetworkParameters.prodNet();
BlockStore blockStore = new MemoryBlockStore(params);
BlockChain chain = new BlockChain(params, blockStore);
PeerGroup peerGroup = new PeerGroup(params, chain);
peerGroup.startAndWait();
PeerAddress addr = new PeerAddress(InetAddress.getLocalHost(), params.port);
peerGroup.addAddress(addr);
peerGroup.waitForPeers(1).get();
Peer peer = peerGroup.getConnectedPeers().get(0);
Sha256Hash blockHash = new Sha256Hash("7fd90d37349af9057e0dea890971a8c2fa34457f63edb7db116aec9fb0670874");
Future<Block> future = peer.getBlock(blockHash);
System.out.println("Waiting for node to send us the requested block: " + blockHash);
Block block = future.get();
System.out.println(block);
peerGroup.stop();
}
}