public static JObject?TryGetAppLog(IExpressReadOnlyStore store, UInt256 hash)
{
var value = store.TryGet(APP_LOGS_PREFIX, hash.ToArray());
if (value != null && value.Length != 0)
{
return(JObject.Parse(Neo.Utility.StrictUTF8.GetString(value)));
}
return(null);
}
public static IEnumerable <Nep17Contract> GetNep17Contracts(IExpressReadOnlyStore store)
{
var scriptHashes = new HashSet <UInt160>();
foreach (var(_, _, notification) in GetNep17Transfers(store))
{
scriptHashes.Add(notification.ScriptHash);
}
scriptHashes.Add(NativeContract.NEO.Hash);
scriptHashes.Add(NativeContract.GAS.Hash);
using var snapshot = Blockchain.Singleton.GetSnapshot();
foreach (var scriptHash in scriptHashes)
{
if (Nep17Contract.TryLoad(snapshot, scriptHash, out var contract))
{
yield return(contract);
}
}
}
static IEnumerable <(uint blockIndex, ushort txIndex, NotificationRecord notification)> GetNep17Transfers(IExpressReadOnlyStore store) => ExpressAppLogsPlugin
public ExpressRpcServer(IExpressReadOnlyStore store, ExpressWalletAccount multiSigAccount)
{
this.store = store;
this.multiSigAccount = multiSigAccount;
cacheId = DateTimeOffset.Now.Ticks.ToString();
}
public static IEnumerable <(Nep17Contract contract, BigInteger balance, uint lastUpdatedBlock)> GetNep17Balances(IExpressReadOnlyStore store, UInt160 address)
{
// assets key is the script hash of the asset contract
// assets value is the last updated block of the assoicated asset for address
var assets = new Dictionary <UInt160, uint>();
foreach (var(blockIndex, _, notification) in GetNep17Transfers(store))
{
var from = ToUInt160(notification.State[0]);
var to = ToUInt160(notification.State[1]);
if (from == address || to == address)
{
assets[notification.ScriptHash] = blockIndex;
}
}
if (!assets.ContainsKey(NativeContract.NEO.Hash))
{
assets[NativeContract.NEO.Hash] = 0;
}
if (!assets.ContainsKey(NativeContract.GAS.Hash))
{
assets[NativeContract.GAS.Hash] = 0;
}
using var snapshot = Blockchain.Singleton.GetSnapshot();
foreach (var kvp in assets)
{
if (TryGetBalance(kvp.Key, out var balance) &&
balance > BigInteger.Zero)
{
var contract = Nep17Contract.TryLoad(snapshot, kvp.Key, out var _contract)
? _contract : Nep17Contract.Unknown(kvp.Key);
yield return(contract, balance, kvp.Value);
}
}
bool TryGetBalance(UInt160 asset, out BigInteger balance)
{
using var sb = new ScriptBuilder();
sb.EmitDynamicCall(asset, "balanceOf", address.ToArray());
using var engine = ApplicationEngine.Run(sb.ToArray(), snapshot);
if (!engine.State.HasFlag(VMState.FAULT) && engine.ResultStack.Count >= 1)
{
balance = engine.ResultStack.Pop <Neo.VM.Types.Integer>().GetInteger();
return(true);
}
balance = default;
return(false);
}
}
public static IEnumerable <(uint blockIndex, ushort txIndex, NotificationRecord notification)> GetNotifications(IExpressReadOnlyStore store)
{
return(store.Seek(NOTIFICATIONS_PREFIX, null, SeekDirection.Forward)
.Select(t =>
{
var(blockIndex, txIndex) = ParseNotificationKey(t.Key);
return (blockIndex, txIndex, t.Value.AsSerializable <NotificationRecord>());
}));