public void TestHeight()
{
var fakeHeaders = new FakeHeaders();
var header0 = fakeHeaders.GenesisChained();
var header1 = fakeHeaders.NextChained();
var chainBuilder = new ChainBuilder();
// verify height with 0 blocks
var chainEmpty = chainBuilder.ToImmutable();
Assert.AreEqual(-1, chainEmpty.Height);
// verify height with 1 block
chainBuilder.AddBlock(header0);
var chain0 = chainBuilder.ToImmutable();
Assert.AreEqual(0, chain0.Height);
// verify height with 2 blocks
chainBuilder.AddBlock(header1);
var chain1 = chainBuilder.ToImmutable();
Assert.AreEqual(1, chain1.Height);
}
public void TestLastBlock()
{
var fakeHeaders = new FakeHeaders();
var header0 = fakeHeaders.GenesisChained();
var header1 = fakeHeaders.NextChained();
var chainBuilder = new ChainBuilder();
// verify last block with 0 blocks
var chainEmpty = chainBuilder.ToImmutable();
Assert.IsNull(chainEmpty.LastBlock);
// verify last block with 1 block
chainBuilder.AddBlock(header0);
var chain0 = chainBuilder.ToImmutable();
Assert.AreEqual(header0, chain0.LastBlock);
// verify last block with 2 blocks
chainBuilder.AddBlock(header1);
var chain1 = chainBuilder.ToImmutable();
Assert.AreEqual(header1, chain1.LastBlock);
}
public void TestToImmutable()
{
var fakeHeaders = new FakeHeaders();
var header0 = fakeHeaders.GenesisChained();
var header1 = fakeHeaders.NextChained();
var chainBuilder = new ChainBuilder();
// verify to builder with 0 blocks
var chainEmpty = chainBuilder.ToImmutable();
Assert.AreEqual(0, chainEmpty.Blocks.Count);
Assert.AreEqual(0, chainEmpty.BlocksByHash.Count);
// verify to builder with 1 block
chainBuilder.AddBlock(header0);
var chain0 = chainBuilder.ToImmutable();
CollectionAssert.AreEqual(new[] { header0 }, chain0.Blocks);
CollectionAssert.AreEquivalent(new Dictionary<UInt256, ChainedHeader> { { header0.Hash, header0 } }, chain0.BlocksByHash);
// verify to builder with 2 blocks
chainBuilder.AddBlock(header1);
var chain1 = chainBuilder.ToImmutable();
CollectionAssert.AreEqual(new[] { header0, header1 }, chain1.Blocks);
CollectionAssert.AreEquivalent(new Dictionary<UInt256, ChainedHeader> { { header0.Hash, header0 }, { header1.Hash, header1 } }, chain1.BlocksByHash);
}
public void TestTotalWork()
{
var fakeHeaders = new FakeHeaders();
var header0 = fakeHeaders.GenesisChained();
var header1 = fakeHeaders.NextChained();
var totalWork0 = DataCalculator.CalculateWork(header0);
var totalWork1 = totalWork0 + DataCalculator.CalculateWork(header1);
var chainBuilder = new ChainBuilder();
// verify total work with 0 blocks
var chainEmpty = chainBuilder.ToImmutable();
Assert.AreEqual(0, chainEmpty.TotalWork);
// verify total work with 1 block
chainBuilder.AddBlock(header0);
var chain0 = chainBuilder.ToImmutable();
Assert.AreEqual(totalWork0, chain0.TotalWork);
// verify total work with 2 blocks
chainBuilder.AddBlock(header1);
var chain1 = chainBuilder.ToImmutable();
Assert.AreEqual(totalWork1, chain1.TotalWork);
}
public void TestBlocks()
{
var fakeHeaders = new FakeHeaders();
var header0 = fakeHeaders.GenesisChained();
var header1 = fakeHeaders.NextChained();
var chainBuilder = new ChainBuilder();
// verify block list with 0 blocks
var chainEmpty = chainBuilder.ToImmutable();
Assert.AreEqual(0, chainEmpty.Blocks.Count);
// verify block list with 1 block
chainBuilder.AddBlock(header0);
var chain0 = chainBuilder.ToImmutable();
CollectionAssert.AreEqual(new[] { header0 }, chain0.Blocks);
// verify block list with 2 blocks
chainBuilder.AddBlock(header1);
var chain1 = chainBuilder.ToImmutable();
CollectionAssert.AreEqual(new[] { header0, header1 }, chain1.Blocks);
}
public static bool TryReadChain(UInt256 blockHash, out Chain chain, Func<UInt256, ChainedHeader> getChainedHeader)
{
// return an empty chain for null blockHash
// when retrieving a chain by its tip, a null tip represents an empty chain
if (blockHash == null)
{
chain = new ChainBuilder().ToImmutable();
return true;
}
var retrievedHeaders = new List<ChainedHeader>();
var chainedHeader = getChainedHeader(blockHash);
if (chainedHeader != null)
{
var expectedHeight = chainedHeader.Height;
do
{
if (chainedHeader.Height != expectedHeight)
{
chain = default(Chain);
return false;
}
retrievedHeaders.Add(chainedHeader);
expectedHeight--;
}
while (expectedHeight >= 0 && chainedHeader.PreviousBlockHash != chainedHeader.Hash
&& (chainedHeader = getChainedHeader(chainedHeader.PreviousBlockHash)) != null);
if (retrievedHeaders.Last().Height != 0)
{
chain = default(Chain);
return false;
}
var chainBuilder = new ChainBuilder();
for (var i = retrievedHeaders.Count - 1; i >= 0; i--)
chainBuilder.AddBlock(retrievedHeaders[i]);
chain = chainBuilder.ToImmutable();
return true;
}
else
{
chain = default(Chain);
return false;
}
}
/// <summary>
/// Create a new Chain instance consisting of a single genesis header.
/// </summary>
/// <param name="genesisBlock">The genesis header.</param>
/// <returns>The Chain instance.</returns>
public static Chain CreateForGenesisBlock(ChainedHeader genesisBlock)
{
var chainBuilder = new ChainBuilder();
chainBuilder.AddBlock(genesisBlock);
return chainBuilder.ToImmutable();
}