public VirtualChain(CronAPI api, KeyPair owner, ChainTime time = null)
{
Reset();
if (time == null)
{
time = new RealTime();
}
this.Time = time;
var scripthash = new UInt160(owner.signatureHash.ToArray());
var txs = new List <Transaction>();
foreach (var entry in _assetMap)
{
var assetID = entry.Key;
var tx = new Transaction();
tx.outputs = new Transaction.Output[] { new Transaction.Output()
{
assetID = assetID, scriptHash = scripthash, value = 1000000000
} };
tx.inputs = new Transaction.Input[] { };
txs.Add(tx);
}
GenerateBlock(txs);
}
public static uint FindBlock(CronAPI api, DateTime date)
{
uint min = 0;
var max = api.GetBlockHeight();
var timestamp = date.ToTimestamp();
return(FindBlock(api, timestamp, min, max));
}
public void SyncWithNode(CronAPI api)
{
var max = api.GetBlockHeight();
var min = (uint)_blocks.Count;
for (uint i = min; i <= max; i++)
{
var block = api.GetBlock(i);
AddBlock(block);
}
}
public static Transaction MintTokens(NEP5 token, KeyPair buyer_key, string symbol, decimal amount)
{
var attachs = new List <Transaction.Output>();
attachs.Add(new Transaction.Output()
{
assetID = CronAPI.GetAssetID(symbol), scriptHash = token.ScriptHash, value = amount
});
var response = token.api.CallContract(buyer_key, token.ScriptHash, "mintTokens", new object[] { }, symbol, attachs);
return(response);
}
public Transaction ClaimGas(KeyPair ownerKey)
{
var targetScriptHash = new UInt160(ownerKey.address.AddressToScriptHash());
decimal amount;
var claimable = GetClaimable(targetScriptHash, out amount);
var references = new List <Transaction.Input>();
foreach (var entry in claimable)
{
references.Add(new Transaction.Input()
{
prevHash = entry.hash, prevIndex = entry.index
});
}
if (amount <= 0)
{
throw new ArgumentException("No GAS to claim at this address");
}
List <Transaction.Input> inputs;
List <Transaction.Output> outputs;
GenerateInputsOutputs(ownerKey, "CRON", null, out inputs, out outputs);
outputs.Add(
new Transaction.Output()
{
scriptHash = targetScriptHash,
assetID = CronAPI.GetAssetID("CRON"),
value = amount
});
Transaction tx = new Transaction()
{
type = TransactionType.ClaimTransaction,
version = 0,
script = null,
gas = -1,
claimReferences = references.ToArray(),
inputs = inputs.ToArray(),
outputs = outputs.ToArray(),
};
tx.Sign(ownerKey);
var ok = SendTransaction(tx);
return(ok ? tx : null);
}
private void MergeTransaction(CronAPI api, Transaction tx)
{
transactions[tx.Hash] = tx;
foreach (var input in tx.inputs)
{
if (!transactions.ContainsKey(input.prevHash))
{
var other = api.GetTransaction(input.prevHash);
transactions[other.Hash] = other;
external_txs.Add(other.Hash);
}
}
}
protected override void Reset()
{
base.Reset();
foreach (var entry in CronAPI.Assets)
{
var symbol = entry.Key;
var assetID = CronAPI.GetAssetID(symbol);
_assetMap[assetID] = new Asset()
{
hash = new UInt256(assetID), name = symbol
};
}
}
// transfer to multiple addresses
public Transaction Transfer(KeyPair from_key, Dictionary <byte[], decimal> transfers)
{
if (transfers.Count > max_transfer_count)
{
throw new ArgumentException("Max transfers per call = " + max_transfer_count);
}
var scripts = new List <byte[]>();
var sender_address_hash = from_key.address.GetScriptHashFromAddress();
int index = 0;
foreach (var entry in transfers)
{
if (entry.Value <= 0)
{
var addr = new UInt160(entry.Key).ToAddress();
throw new ArgumentException($"Invalid amount {entry.Value} for address {addr}");
}
BigInteger amount = ConvertToBigInt(entry.Value);
var isLast = index == transfers.Count - 1;
var args = new object[] { sender_address_hash, entry.Key, amount };
var bytes = CronAPI.GenerateScript(ScriptHash, new object[] { "transfer", args }, isLast);
scripts.Add(bytes);
index++;
}
var final_size = scripts.Sum(x => x.Length);
byte[] final_script = new byte[final_size];
using (var stream = new MemoryStream(final_script))
{
foreach (byte[] bytes in scripts)
{
stream.Write(bytes, 0, bytes.Length);
}
}
var response = api.CallContract(from_key, ScriptHash, final_script);
return(response);
}
private static uint FindBlock(CronAPI api, uint timestamp, uint min, uint max)
{
var mid = (1 + max - min) / 2;
do
{
var block = api.GetBlock(mid);
var blockTime = block.Date.ToTimestamp();
if (blockTime == timestamp)
{
return(block.Height);
}
else
if (blockTime < timestamp)
{
var next = api.GetBlock(mid + 1);
var nextTime = next.Date.ToTimestamp();
if (nextTime == timestamp)
{
return(next.Height);
}
else
if (nextTime > timestamp)
{
return(block.Height);
}
else
{
return(FindBlock(api, timestamp, mid + 1, max));
}
}
else
{
return(FindBlock(api, timestamp, min, mid - 1));
}
} while (true);
}
// claim from contract, without having private key
public Transaction ClaimGas(KeyPair ownerKey, UInt160 fromScripthash, byte[] verificationScript)
{
var check = verificationScript.ToScriptHash();
if (check != fromScripthash)
{
throw new ArgumentException("Invalid verification script");
}
decimal amount;
var claimable = GetClaimable(fromScripthash, out amount);
var references = new List <Transaction.Input>();
foreach (var entry in claimable)
{
references.Add(new Transaction.Input()
{
prevHash = entry.hash, prevIndex = entry.index
});
}
if (amount <= 0)
{
throw new ArgumentException("No GAS to claim at this address");
}
List <Transaction.Input> inputs;
List <Transaction.Output> outputs;
GenerateInputsOutputs(ownerKey, "CRON", null, out inputs, out outputs);
outputs.Add(
new Transaction.Output()
{
scriptHash = fromScripthash,
assetID = CronAPI.GetAssetID("CRON"),
value = amount
});
Transaction tx = new Transaction()
{
type = TransactionType.ClaimTransaction,
version = 0,
script = null,
gas = -1,
claimReferences = references.ToArray(),
inputs = inputs.ToArray(),
outputs = outputs.ToArray(),
};
var witness = new Witness {
invocationScript = ("0014" + ownerKey.address.AddressToScriptHash().ByteToHex()).HexToBytes(), verificationScript = verificationScript
};
tx.Sign(ownerKey, new Witness[] { witness });
var ok = SendTransaction(tx);
return(ok ? tx : null);
}
public BlockIterator(CronAPI api)
{
this.currentBlock = api.GetBlockHeight();
this.currentTransaction = 0;
}
public void Execute(CronAPI api, UInt160 script_hash, Action <ListenerVM> visitor)
{
var balances = new Dictionary <UInt160, decimal>();
var vm = new ListenerVM(this);
/*vm.AddScript(token_script);
*
* var debugger = new DebugClient();
* debugger.SendScript(token_script);
*/
throw new NotImplementedException();
IEnumerable <Block> sorted_blocks = blocks.Values.OrderBy(x => x.Date);
foreach (var block in sorted_blocks)
{
vm.SetCurrentBlock(block);
bool executed = false;
foreach (var tx in block.transactions)
{
switch (tx.type)
{
case TransactionType.InvocationTransaction:
{
List <AVMInstruction> ops;
try
{
ops = CronTools.Disassemble(tx.script);
}
catch
{
continue;
}
for (int i = 0; i < ops.Count; i++)
{
var op = ops[i];
if (op.opcode == OpCode.APPCALL && op.data != null && op.data.Length == 20)
{
var otherScriptHash = new UInt160(op.data);
if (otherScriptHash != script_hash)
{
continue;
}
var engine = new ExecutionEngine(tx, vm, vm);
engine.LoadScript(tx.script);
engine.Execute(
x =>
{
//debugger.Step(x);
}
);
executed = true;
}
}
break;
}
}
}
if (executed)
{
visitor(vm);
}
}
}
public NEP5(CronAPI api, string contractHash) : this(api, CronAPI.GetScriptHashFromString(contractHash))
{
}
public Snapshot(UInt160 scriptHash, CronAPI api, uint startBlock, uint endBlock = 0)
{
if (endBlock == 0)
{
endBlock = api.GetBlockHeight();
}
if (endBlock < startBlock)
{
throw new ArgumentException("End block cannot be smaller than start block");
}
for (uint height = startBlock; height <= endBlock; height++)
{
var block = api.GetBlock(height);
var snapCount = 0;
foreach (var tx in block.transactions)
{
switch (tx.type)
{
case TransactionType.ContractTransaction:
{
foreach (var output in tx.outputs)
{
if (output.scriptHash == scriptHash)
{
MergeTransaction(api, tx);
snapCount++;
break;
}
}
break;
}
case TransactionType.InvocationTransaction:
{
List <AVMInstruction> ops;
try
{
ops = CronTools.Disassemble(tx.script);
}
catch
{
continue;
}
for (int i = 0; i < ops.Count; i++)
{
var op = ops[i];
if (op.opcode == OpCode.APPCALL && op.data != null && op.data.Length == 20)
{
var otherScriptHash = new UInt160(op.data);
if (otherScriptHash == scriptHash)
{
MergeTransaction(api, tx);
snapCount++;
break;
}
}
}
break;
}
}
}
if (snapCount > 0)
{
blocks[block.Hash] = block;
}
}
}
public NEP5(CronAPI api, string contractHash, string name, BigInteger decimals)
: this(api, contractHash)
{
this._decimals = decimals;
this._name = name;
}
public NEP5(CronAPI api, UInt160 contractHash)
{
this.api = api;
this.ScriptHash = contractHash;
}
public NEP5(CronAPI api, byte[] contractHash) : this(api, new UInt160(contractHash))
{
}