public Task Sync()
{
return(Task.Run(async() => {
Log += "syncing..." + Environment.NewLine;
OnLogChanged();
while (true)
{
var(index, node) = Nodes.Aggregate((index: BlockChain.Last().Index, node: (Uri)null), (m, n) =>
Task.Run(async() => {
HttpResponseMessage response;
try {
response = await httpClient_.PostAsync(n, new StringContent(JsonConvert.SerializeObject(
new GetCurrentIndex {
PortNumber = PortNumber
})));
} catch (HttpRequestException) {
return m;
}
if (!response.IsSuccessStatusCode)
{
return m;
}
var res = JsonConvert.DeserializeObject <GetCurrentIndexResponse>(await response.Content.ReadAsStringAsync());
if (res.CurrentIndex <= m.index)
{
return m;
}
return (index: res.CurrentIndex, node: n);
}).Result);
if (node == null)
{
break;
}
if (index > BlockChain.Last().Index)
{
IList <Block> branch;
var currentIndex = BlockChain.Last().Index;
{
HttpResponseMessage response;
try {
response = await httpClient_.PostAsync(node, new StringContent(JsonConvert.SerializeObject(
new GetBlocks {
Index = currentIndex + 1, NumBlocks = index - currentIndex
})));
} catch (HttpRequestException) {
continue;
}
if (!response.IsSuccessStatusCode)
{
continue;
}
var res = JsonConvert.DeserializeObject <GetBlocksResponse>(await response.Content.ReadAsStringAsync());
branch = res.Blocks;
}
if (branch.First().PreviousHash == LastHash)
{
var removed = false;
foreach (var block in branch)
{
foreach (var transaction in block.Transactions)
{
if (TransactionPool.Contains(transaction))
{
TransactionPool.Remove(transaction);
removed = true;
}
}
}
if (removed)
{
OnTransactionPoolChanged();
}
BlockChain.AddRange(branch);
break;
}
while (true)
{
HttpResponseMessage response;
try {
response = await httpClient_.PostAsync(node, new StringContent(JsonConvert.SerializeObject(
new GetBlocks {
Index = currentIndex, NumBlocks = 1
})));
} catch (HttpRequestException) {
goto con;
}
if (!response.IsSuccessStatusCode)
{
goto con;
}
var res = JsonConvert.DeserializeObject <GetBlocksResponse>(await response.Content.ReadAsStringAsync());
branch.Insert(0, res.Blocks.First());
if (BlockChain[currentIndex].PreviousHash == branch.First().PreviousHash)
{
break;
}
--currentIndex;
}
BlockChain.RemoveRange(currentIndex, BlockChain.Count - currentIndex);
var removed2 = false;
foreach (var block in branch)
{
foreach (var transaction in block.Transactions)
{
if (TransactionPool.Contains(transaction))
{
TransactionPool.Remove(transaction);
removed2 = true;
}
}
}
if (removed2)
{
OnTransactionPoolChanged();
}
BlockChain.AddRange(branch);
break;
}
con:;
}
LastHash = SerializeHash(GetHash(BlockChain.Last()));
OnBlockChainChanged();
Log += "sync completed." + Environment.NewLine;
OnLogChanged();
}));
}