/**
* 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.devcoin.utils;
import com.google.devcoin.core.*;
import com.google.devcoin.store.BlockStore;
import com.google.devcoin.store.BlockStoreException;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.math.BigInteger;
public class TestUtils {
public static Transaction createFakeTxWithChangeAddress(NetworkParameters params, BigInteger nanocoins, Address to, Address changeOutput)
throws IOException, ProtocolException {
// Create a fake TX of sufficient realism to exercise the unit tests. Two outputs, one to us, one to somewhere
// else to simulate change.
Transaction t = new Transaction(params);
TransactionOutput outputToMe = new TransactionOutput(params, t, nanocoins, to);
t.addOutput(outputToMe);
TransactionOutput change = new TransactionOutput(params, t, Utils.toNanoCoins(1, 11), changeOutput);
t.addOutput(change);
// Make a previous tx simply to send us sufficient coins. This prev tx is not really valid but it doesn't
// matter for our purposes.
Transaction prevTx = new Transaction(params);
TransactionOutput prevOut = new TransactionOutput(params, prevTx, nanocoins, to);
prevTx.addOutput(prevOut);
// Connect it.
t.addInput(prevOut);
// Serialize/deserialize to ensure internal state is stripped, as if it had been read from the wire.
return roundTripTransaction(params, t);
}
public static Transaction createFakeTx(NetworkParameters params, BigInteger nanocoins, Address to) throws IOException, ProtocolException {
return createFakeTxWithChangeAddress(params, nanocoins, to, new ECKey().toAddress(params));
}
public static Transaction createFakeTx(NetworkParameters params, BigInteger nanocoins, ECKey to) throws IOException, ProtocolException {
// Create a fake TX of sufficient realism to exercise the unit tests. Two outputs, one to us, one to somewhere
// else to simulate change.
Transaction t = new Transaction(params);
TransactionOutput outputToMe = new TransactionOutput(params, t, nanocoins, to);
t.addOutput(outputToMe);
TransactionOutput change = new TransactionOutput(params, t, Utils.toNanoCoins(1, 11), new ECKey());
t.addOutput(change);
// Make a previous tx simply to send us sufficient coins. This prev tx is not really valid but it doesn't
// matter for our purposes.
Transaction prevTx = new Transaction(params);
TransactionOutput prevOut = new TransactionOutput(params, prevTx, nanocoins, to);
prevTx.addOutput(prevOut);
// Connect it.
t.addInput(prevOut);
// Serialize/deserialize to ensure internal state is stripped, as if it had been read from the wire.
return roundTripTransaction(params, t);
}
/**
* @return Transaction[] Transaction[0] is a feeder transaction, supplying BTC to Transaction[1]
*/
public static Transaction[] createFakeTx(NetworkParameters params, BigInteger nanocoins,
Address to, Address from) throws IOException, ProtocolException {
// Create fake TXes of sufficient realism to exercise the unit tests. This transaction send BTC from the
// from address, to the to address with to one to somewhere else to simulate change.
Transaction t = new Transaction(params);
TransactionOutput outputToMe = new TransactionOutput(params, t, nanocoins, to);
t.addOutput(outputToMe);
TransactionOutput change = new TransactionOutput(params, t, Utils.toNanoCoins(1, 11), new ECKey().toAddress(params));
t.addOutput(change);
// Make a feeder tx that sends to the from address specified. This feeder tx is not really valid but it doesn't
// matter for our purposes.
Transaction feederTx = new Transaction(params);
TransactionOutput feederOut = new TransactionOutput(params, feederTx, nanocoins, from);
feederTx.addOutput(feederOut);
// make a previous tx that sends from the feeder to the from address
Transaction prevTx = new Transaction(params);
TransactionOutput prevOut = new TransactionOutput(params, prevTx, nanocoins, to);
prevTx.addOutput(prevOut);
// Connect up the txes
prevTx.addInput(feederOut);
t.addInput(prevOut);
// roundtrip the tx so that they are just like they would be from the wire
return new Transaction[]{roundTripTransaction(params, prevTx), roundTripTransaction(params,t)};
}
/**
* Roundtrip a transaction so that it appears as if it has just come from the wire
*/
public static Transaction roundTripTransaction(NetworkParameters params, Transaction tx) throws IOException, ProtocolException {
BitcoinSerializer bs = new BitcoinSerializer(params);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
bs.serialize(tx, bos);
return (Transaction) bs.deserialize(new ByteArrayInputStream(bos.toByteArray()));
}
public static class DoubleSpends {
public Transaction t1, t2, prevTx;
}
/**
* Creates two transactions that spend the same (fake) output. t1 spends to "to". t2 spends somewhere else.
* The fake output goes to the same address as t2.
*/
public static DoubleSpends createFakeDoubleSpendTxns(NetworkParameters params, Address to) {
DoubleSpends doubleSpends = new DoubleSpends();
BigInteger value = Utils.toNanoCoins(1, 0);
Address someBadGuy = new ECKey().toAddress(params);
doubleSpends.t1 = new Transaction(params);
TransactionOutput o1 = new TransactionOutput(params, doubleSpends.t1, value, to);
doubleSpends.t1.addOutput(o1);
doubleSpends.prevTx = new Transaction(params);
TransactionOutput prevOut = new TransactionOutput(params, doubleSpends.prevTx, value, someBadGuy);
doubleSpends.prevTx.addOutput(prevOut);
doubleSpends.t1.addInput(prevOut);
doubleSpends.t2 = new Transaction(params);
doubleSpends.t2.addInput(prevOut);
TransactionOutput o2 = new TransactionOutput(params, doubleSpends.t2, value, someBadGuy);
doubleSpends.t2.addOutput(o2);
try {
doubleSpends.t1 = new Transaction(params, doubleSpends.t1.bitcoinSerialize());
doubleSpends.t2 = new Transaction(params, doubleSpends.t2.bitcoinSerialize());
} catch (ProtocolException e) {
throw new RuntimeException(e);
}
return doubleSpends;
}
public static class BlockPair {
public StoredBlock storedBlock;
public Block block;
}
// Emulates receiving a valid block that builds on top of the chain.
public static BlockPair createFakeBlock(BlockStore blockStore, long timeSeconds, Transaction... transactions) {
try {
Block chainHead = blockStore.getChainHead().getHeader();
Address to = new ECKey().toAddress(chainHead.getParams());
Block b = chainHead.createNextBlock(to, timeSeconds);
// Coinbase tx was already added.
for (Transaction tx : transactions) {
tx.getConfidence().setSource(TransactionConfidence.Source.NETWORK);
b.addTransaction(tx);
}
b.solve();
BlockPair pair = new BlockPair();
pair.block = b;
pair.storedBlock = blockStore.getChainHead().build(b);
blockStore.put(pair.storedBlock);
blockStore.setChainHead(pair.storedBlock);
return pair;
} catch (VerificationException e) {
throw new RuntimeException(e); // Cannot happen.
} catch (BlockStoreException e) {
throw new RuntimeException(e); // Cannot happen.
}
}
public static BlockPair createFakeBlock(BlockStore blockStore, Transaction... transactions) {
return createFakeBlock(blockStore, Utils.now().getTime() / 1000, transactions);
}
public static Block makeSolvedTestBlock(BlockStore blockStore, Address coinsTo) throws BlockStoreException {
Block b = blockStore.getChainHead().getHeader().createNextBlock(coinsTo);
b.solve();
return b;
}
public static Block makeSolvedTestBlock(Block prev, Transaction... transactions) throws BlockStoreException {
Address to = new ECKey().toAddress(prev.getParams());
Block b = prev.createNextBlock(to);
// Coinbase tx already exists.
for (Transaction tx : transactions) {
b.addTransaction(tx);
}
b.solve();
return b;
}
}