/*
* Copyright 2012 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.devcoin.examples;
import com.google.devcoin.core.*;
import com.google.devcoin.params.MainNetParams;
import com.google.devcoin.store.BlockStore;
import com.google.devcoin.store.MemoryBlockStore;
import com.google.devcoin.utils.BriefLogFormatter;
import com.google.common.util.concurrent.ListenableFuture;
import java.net.InetAddress;
import java.util.List;
/**
* Downloads the given transaction and its dependencies from a peers memory pool then prints them out.
*/
public class FetchTransactions {
public static void main(String[] args) throws Exception {
BriefLogFormatter.init();
System.out.println("Connecting to node");
final NetworkParameters params = MainNetParams.get();
BlockStore blockStore = new MemoryBlockStore(params);
BlockChain chain = new BlockChain(params, blockStore);
PeerGroup peerGroup = new PeerGroup(params, chain);
peerGroup.startAndWait();
peerGroup.addAddress(new PeerAddress(InetAddress.getLocalHost(), params.getPort()));
peerGroup.waitForPeers(1).get();
Peer peer = peerGroup.getConnectedPeers().get(0);
Sha256Hash txHash = new Sha256Hash(args[0]);
ListenableFuture<Transaction> future = peer.getPeerMempoolTransaction(txHash);
System.out.println("Waiting for node to send us the requested transaction: " + txHash);
Transaction tx = future.get();
System.out.println(tx);
System.out.println("Waiting for node to send us the dependencies ...");
List<Transaction> deps = peer.downloadDependencies(tx).get();
for (Transaction dep : deps) {
System.out.println("Got dependency " + dep.getHashAsString());
}
System.out.println("Done.");
peerGroup.stopAndWait();
}
}