int IComparable.CompareTo(object obj) //sortable by value
{
UTXO x = (UTXO)obj;
if (this.Value == x.Value)
{
return(0);
}
return(this.Value > x.Value ? 1 : -1);
}
//parse json UTXO response
public static UTXO[] ParseUTXO(string msg)
{
List <UTXO> lst = new List <UTXO>();
/*
* {"jsonrpc": "2.0", "id": "1", "result":
* [{"tx_hash": "60c21462d1ddbac55ed34f205b9776303953c2b74de1f4283630e69db78d65ec", "tx_pos": 1, "height": 1260557, "value": 129967000},
* {"tx_hash": "04fa60e351ffedff984e7cad9697a532dd6dc97966ed64b26919cc1741639861", "tx_pos": 0, "height": 1261826, "value": 16230000},
* {"tx_hash": "70c3f2ff2721846bac77bf8aad863efdbc20ed0cc2f59dda6d7dfd02682c2805", "tx_pos": 0, "height": 1261827, "value": 32480000}]
* }
*/
msg = msg.Replace("\"", "").Replace(" ", "");
/*
* {jsonrpc:2.0,id:1,result:
* [{tx_hash:60c21462d1ddbac55ed34f205b9776303953c2b74de1f4283630e69db78d65ec,tx_pos:1,height:1260557,value:129967000},
* {tx_hash:04fa60e351ffedff984e7cad9697a532dd6dc97966ed64b26919cc1741639861,tx_pos:0,height:1261826,value:16230000},
* {tx_hash:70c3f2ff2721846bac77bf8aad863efdbc20ed0cc2f59dda6d7dfd02682c2805,tx_pos:0,height:1261827,value:32480000}]
* }
*/
int pos = 0;
while (true)
{
pos = msg.IndexOf("tx_hash", pos);
if (pos < 0)
{
break;
}
int pos2 = msg.IndexOf("}", pos) - 1;
string oneutxo = msg.Substring(pos, pos2 - pos + 1); //tx_hash:60c21462d1ddbac55ed34f205b9776303953c2b74de1f4283630e69db78d65ec,tx_pos:1,height:1260557,value:129967000
string[] vals = oneutxo.Split(',');
UTXO x = new UTXO();
x.Tx_hash = vals[0].Split(':')[1]; //tx_hash:60c21462d1ddbac55ed34f205b9776303953c2b74de1f4283630e69db78d65ec
x.Tx_pos = int.Parse(vals[1].Split(':')[1]); //tx_pos:1
x.Height = int.Parse(vals[2].Split(':')[1]); //height:1260557
x.Value = int.Parse(vals[3].Split(':')[1]); //value:129967000 (satoshi)
lst.Add(x);
pos = pos2;
}
UTXO[] arr = lst.ToArray();
Array.Sort(arr); //smallest value first
return(arr);
}
//take in tx parameters, return tx object
public static TxSerial CreateTx(string extPubKey, string pubToAddr, string chgAddr, int walletId, long satToSend, long fee, bool testnet)
{
CheckNullOrEmpty(new object[] { extPubKey, pubToAddr, ElectrumXhost },
new string[] { "extPubKey", "pubToAddr", "ElectrumXhost" });
string err = "";
if (satToSend == 0)
{
err += "satoshiToSend = 0, ";
}
if (fee == 0)
{
err += "satoshiFee = 0, ";
}
if (err != "")
{
throw new Exception("[CreateTx] " + err);
}
//get first 100+100 child address from ext pub key
List <Tuple <string, string> > recAddrList = GetDerivedKeys(extPubKey, 0, 20, false, testnet); //receive addresses
List <Tuple <string, string> > chgAddrList = GetDerivedKeys(extPubKey, 0, 20, true, testnet); //change addresses
//TODO - create process for getting next change address, so address never used twice
if (chgAddr == null || chgAddr == "") //get first chg addr for extPubKey
{
chgAddr = chgAddrList.First().Item1;
}
//server status check
string info = ElectrumX.GetServerInfo(ElectrumXhost, ElectrumXport);
if (info == null)
{
throw new Exception("[CreateTx] ElectrumX Server Check Failed");
}
string[] recAddrListAddr = new string[recAddrList.Count]; //short address
string[] recAddrListExt = new string[recAddrList.Count]; //long address
int ctr = 0;
foreach (var t in recAddrList)
{
recAddrListAddr[ctr++] = t.Item1; //short
}
ctr = 0;
foreach (var t in recAddrList)
{
recAddrListExt[ctr++] = t.Item2; //long - hash
}
string[] chgAddrListAddr = new string[recAddrList.Count];
string[] chgAddrListExt = new string[recAddrList.Count];
ctr = 0;
foreach (var t in chgAddrList)
{
chgAddrListAddr[ctr++] = t.Item1;
}
ctr = 0;
foreach (var t in chgAddrList)
{
chgAddrListExt[ctr++] = t.Item2;
}
//get all UTXOs (unspent inputs) from receive addresses
UTXO[] recUTXOs = ElectrumX.GetUTXOs(recAddrList, ElectrumXhost, ElectrumXport);
UTXO.SetAddressType(recUTXOs, 0); //receiver
//get all UTXOs (unspent inputs) from change addresses
UTXO[] chgUTXOs = ElectrumX.GetUTXOs(chgAddrList, ElectrumXhost, ElectrumXport);
UTXO.SetAddressType(chgUTXOs, 1); //change
//start new tx
TransactionBuilder bldr = new TransactionBuilder();
bldr.Send(new BitcoinPubKeyAddress(pubToAddr), Money.Satoshis(satToSend)); //amount to send to recipient
bldr.SetChange(new BitcoinPubKeyAddress(chgAddr)); //send change to this address
bldr.SendFees(Money.Satoshis(fee)); //miner (tx) fee
//collect all UTXOs
List <UTXO> allUTXOs = new List <UTXO>();
allUTXOs.AddRange(recUTXOs);
allUTXOs.AddRange(chgUTXOs);
List <ICoin> lstTxCoins = new List <ICoin>(); //Coin is a UTXO
//add new coin for each UTXO
foreach (UTXO x in allUTXOs) //tx builder will select coins from this list
{
BitcoinPubKeyAddress fromAddr = new BitcoinPubKeyAddress(x.Address);
NBitcoin.Coin cn = null;
//create new coin from UTXO
bldr.AddCoins(cn = new NBitcoin.Coin(
new OutPoint(new uint256(x.Tx_hash), x.Tx_pos), //tx that funded wallet, spend this coin
new TxOut(Money.Satoshis(x.Value), fromAddr.ScriptPubKey))); //specify full coin amount, else SetChange ignored
lstTxCoins.Add(cn); //add coin to transaction, may not be used
x.tmp = cn; //link UTXO with coin
}
List <UTXO> usedUTXOs = new List <UTXO>(); //coins actually used in tx
NBitcoin.Transaction tx = bldr.BuildTransaction(false); //sort\filter coins, some coins will not be needed\used
//coin objects not stored in tx, so we need to determine which coins were used
//scan tx inputs for matching coins, ignore other coins
foreach (UTXO u in allUTXOs)
{
foreach (TxIn i in tx.Inputs)
{
if (i.PrevOut == ((NBitcoin.Coin)u.tmp).Outpoint) //this coin in tx
{
usedUTXOs.Add(u); //this UTXO will be used\spent in tx
}
}
}
//populate return object
TxSerial txs = new TxSerial()
{
SendAmt = satToSend,
Fee = fee,
ExtPublicKey = extPubKey,
ToAddress = pubToAddr,
ChgAddress = chgAddr,
WalletId = walletId
};
txs.ExtPublicKey = extPubKey;
foreach (UTXO u in usedUTXOs)
{
u.tmp = null; //don't serialize coin object, will rebuild coins in signing process
}
txs.InputUTXOs = new List <UTXO>();
txs.InputUTXOs.AddRange(usedUTXOs);
//string jsn = Newtonsoft.Json.JsonConvert.SerializeObject(txs, Newtonsoft.Json.Formatting.Indented);
return(txs);
}
