// TODO: Condense TestUnspents into ONE call for MULTIPLE addresses (separated by | for Unspents according to API docs)
// TODO: Enable backend to call a running bitcoin node for all this instead of callign third party services
public static bool TestUnspents(BitcoinChain chain, string address)
{
// This function queries the Blockchain API for the unspent coin.
bool result = false;
HotBitcoinAddress hotAddress = null;
JObject addressInfoResult;
JObject unspentJsonResult;
switch (chain)
{
case BitcoinChain.Core:
addressInfoResult =
JObject.Parse(
new WebClient().DownloadString(
"https://blockchain.info/address/" + address + "?format=json&api_key=" +
SystemSettings.BlockchainSwarmopsApiKey));
if ((int)addressInfoResult["final_balance"] == 0)
{
return(false); // no funds on address at all at this time
}
try
{
unspentJsonResult = JObject.Parse(
new WebClient().DownloadString("https://blockchain.info/unspent?active=" + address + "&api_key=" +
SystemSettings.BlockchainSwarmopsApiKey));
}
catch (WebException webException)
{
// A 500 on the above _may_ mean that there's no unspent outpoints. It can also mean a data
// retrieval or network error, in which case the exception must absolutely not be interpreted
// as valid data of zero unspent outpoints.
try
{
if (webException.Response == null)
{
throw; // if there's no response at all, we can't do shit
}
string errorResponseContent =
new StreamReader(webException.Response.GetResponseStream()).ReadToEnd();
if (errorResponseContent.Trim().StartsWith("No free outputs to spend"))
{
// all is okay network-wise, there just aren't any UTXOs so we're getting an error code for that
return(false); // no further processing and there are no fresh transactions
}
throw; // otherwise throw upward
}
catch (WebException)
{
// Ok, we tried, but there's apparently a network error so we need to abort this whole thing
throw;
}
}
foreach (var unspentJson in unspentJsonResult["unspent_outputs"])
{
BitcoinUnspentTransactionOutput txUnspent = new BitcoinUnspentTransactionOutput()
{
BitcoinAddress = address,
ConfirmationCount = (UInt32)unspentJson["confirmations"],
Satoshis = (UInt64)unspentJson["value"],
TransactionHash = (string)unspentJson["tx_hash_big_endian"],
TransactionOutputIndex = (UInt32)unspentJson["tx_output_n"]
};
if (txUnspent.ConfirmationCount < 2)
{
// Fresh transactions, return true
result = true;
}
// Add unspent to database
if (hotAddress == null)
{
hotAddress = HotBitcoinAddress.FromAddress(chain, address);
}
SwarmDb.GetDatabaseForWriting()
.CreateHotBitcoinAddressUnspentConditional(hotAddress.Identity, txUnspent.TransactionHash,
(int)txUnspent.TransactionOutputIndex, (Int64)txUnspent.Satoshis,
(int)txUnspent.ConfirmationCount);
}
// Update hotaddress totals
HotBitcoinAddresses.UpdateAllUnspentTotals();
return(result);
case BitcoinChain.Cash:
// TODO: SELECTION OF BLOCK EXPLORER, ADDRESS STRING FORMAT TO GO WITH IT
addressInfoResult =
JObject.Parse(
new WebClient().DownloadString(
"https://bitcoincash.blockexplorer.com/api/addr/" + address));
JArray unspentArray;
if ((int)addressInfoResult["balanceSat"] == 0 && (int)addressInfoResult["unconfirmedBalanceSat"] == 0)
{
return(false); // no funds on address at all at this time
}
try
{
unspentArray = JArray.Parse(
new WebClient().DownloadString("https://bitcoincash.blockexplorer.com/api/addr/" + address + "/utxo"));
}
catch (WebException webException)
{
// A 500 on the above _may_ mean that there's no unspent outpoints. It can also mean a data
// retrieval or network error, in which case the exception must absolutely not be interpreted
// as valid data of zero unspent outpoints.
try
{
if (webException.Response == null)
{
throw; // if there's no response at all, we can't do shit
}
string errorResponseContent =
new StreamReader(webException.Response.GetResponseStream()).ReadToEnd();
if (errorResponseContent.Trim().StartsWith("No free outputs to spend"))
{
// all is okay network-wise, there just aren't any UTXOs so we're getting an error code for that
return(false); // no further processing and there are no fresh transactions
}
throw; // otherwise throw upward
}
catch (WebException)
{
// Ok, we tried, but there's apparently a network error so we need to abort this whole thing
throw;
}
}
foreach (JObject unspentJson in unspentArray.Children())
{
BitcoinUnspentTransactionOutput txUnspent = new BitcoinUnspentTransactionOutput()
{
BitcoinAddress = address,
ConfirmationCount = (UInt32)unspentJson["confirmations"],
Satoshis = (UInt64)unspentJson["satoshis"],
TransactionHash = (string)unspentJson["txid"],
TransactionOutputIndex = (UInt32)unspentJson["vout"]
};
if (txUnspent.ConfirmationCount < 2)
{
// Fresh transactions, return true
result = true;
}
// Add unspent to database
if (hotAddress == null)
{
hotAddress = HotBitcoinAddress.GetAddressOrForkCore(chain, address);
}
SwarmDb.GetDatabaseForWriting()
.CreateHotBitcoinAddressUnspentConditional(hotAddress.Identity, txUnspent.TransactionHash,
(int)txUnspent.TransactionOutputIndex, (Int64)txUnspent.Satoshis,
(int)txUnspent.ConfirmationCount);
}
// Update hotaddress totals
HotBitcoinAddresses.UpdateAllUnspentTotals();
return(result);
default:
throw new NotImplementedException("Unimplemented bitcoin chain: " + chain);
}
}
public static Coin[] GetSpendableCoin(BitcoinChain chain, BitcoinSecret secretKey)
// we're using BitcoinSecret as arg just to reinforce caller must have privkey to spend funds
{
List <Coin> coinList = new List <Coin>();
switch (chain)
{
case BitcoinChain.Core:
// For the Core net, we query the Blockchain API for the unspent coin.
string addressString = secretKey.PubKey.GetAddress(Network.Main).ToString();
var unspentJsonResult =
JObject.Parse(
new WebClient().DownloadString("https://blockchain.info/unspent?active=" + addressString +
"&api_key=" + SystemSettings.BlockchainSwarmopsApiKey));
foreach (var unspentJson in unspentJsonResult["unspent_outputs"])
{
BitcoinUnspentTransactionOutput txUnspent = new BitcoinUnspentTransactionOutput()
{
BitcoinAddress = addressString,
ConfirmationCount = (UInt32)unspentJson["confirmations"],
Satoshis = (UInt64)unspentJson["value"],
TransactionHash = (string)unspentJson["tx_hash_big_endian"],
TransactionOutputIndex = (UInt32)unspentJson["tx_output_n"]
};
coinList.Add(txUnspent); // invokes implicit conversion to NBitcoin.Coin
}
break;
case BitcoinChain.Cash:
JArray unspentArray;
// TODO: SELECT BLOCK EXPLORER AND ITS ACCOMPANYING ADDRESS FORMAT
unspentArray = JArray.Parse(
new WebClient().DownloadString("https://bitcoincash.blockexplorer.com/api/addr/" + secretKey.PubKey.GetAddress(Network.Main) + "/utxo"));
foreach (JObject unspentJson in unspentArray.Children())
{
BitcoinUnspentTransactionOutput txUnspent = new BitcoinUnspentTransactionOutput()
{
BitcoinAddress = secretKey.PubKey.GetAddress(Network.Main).ToString(),
ConfirmationCount = (UInt32)unspentJson["confirmations"],
Satoshis = (UInt64)unspentJson["satoshis"],
TransactionHash = (string)unspentJson["txid"],
TransactionOutputIndex = (UInt32)unspentJson["vout"]
};
coinList.Add(txUnspent); // invokes implicit conversion to NBitcoin.Coin
}
break;
default:
throw new NotImplementedException("Unimplemented chain identity: " + chain);
}
return(coinList.ToArray());
}
