public JObject ExpressEnumNotifications(JArray @params)
{
var contracts = ((JArray)@params[0]).Select(j => UInt160.Parse(j.AsString())).ToHashSet();
var events = ((JArray)@params[1]).Select(j => j.AsString()).ToHashSet(StringComparer.OrdinalIgnoreCase);
int skip = @params.Count >= 3 ? (int)@params[2].AsNumber() : 0;
int take = @params.Count >= 4 ? (int)@params[3].AsNumber() : MAX_NOTIFICATIONS;
if (take > MAX_NOTIFICATIONS)
{
take = MAX_NOTIFICATIONS;
}
var notifications = PersistencePlugin
.GetNotifications(
storageProvider,
SeekDirection.Backward,
contracts.Count > 0 ? contracts : null,
events.Count > 0 ? events : null)
.Skip(skip);
var count = 0;
var jsonNotifications = new JArray();
var truncated = false;
foreach (var(blockIndex, _, notification) in notifications)
{
if (count++ > take)
{
truncated = true;
break;
}
var jNotification = new JObject
{
["block-index"] = blockIndex,
["script-hash"] = notification.ScriptHash.ToString(),
["event-name"] = notification.EventName,
["inventory-type"] = (byte)notification.InventoryType,
["inventory-hash"] = notification.InventoryHash.ToString(),
["state"] = Neo.VM.Helper.ToJson(notification.State),
};
jsonNotifications.Add(jNotification);
}
return(new JObject
{
["truncated"] = truncated,
["notifications"] = jsonNotifications,
});
}
public JObject GetNep17Balances(JArray @params)
{
var address = AsScriptHash(@params[0]);
using var snapshot = neoSystem.GetSnapshot();
// collect the non-zero balances of all the deployed Nep17 contracts for the specified account
var addressBalances = TokenContract.Enumerate(snapshot)
.Where(c => c.standard == TokenStandard.Nep17)
.Select(c => (
scriptHash: c.scriptHash,
balance: snapshot.GetNep17Balance(c.scriptHash, address, neoSystem.Settings)))
.Where(t => !t.balance.IsZero)
.ToList();
// collect the last block index a transfer occurred for all account balances
var updateIndexes = new Dictionary <UInt160, uint>();
if (addressBalances.Count > 0)
{
var notifications = PersistencePlugin.GetNotifications(
storageProvider,
SeekDirection.Backward,
addressBalances.Select(b => b.scriptHash).ToHashSet(),
TRANSFER);
foreach (var(blockIndex, _, notification) in notifications)
{
// iterate backwards thru the notifications looking for all the Transfer events from a contract
// in assets where a Transfer event hasn't already been recorded
if (!updateIndexes.ContainsKey(notification.ScriptHash))
{
var transfer = TransferNotificationRecord.Create(notification);
if (transfer is not null &&
(transfer.From == address || transfer.To == address))
{
// if the specified account was the sender or receiver of the current transfer,
// record the update index. Stop the iteration if indexes for all the assets are
// have been recorded
updateIndexes.Add(notification.ScriptHash, blockIndex);
if (updateIndexes.Count == addressBalances.Count)
{
break;
}
}
}
}
}
var balances = new JArray();
for (int i = 0; i < addressBalances.Count; i++)
{
var(scriptHash, balance) = addressBalances[i];
var lastUpdatedBlock = updateIndexes.TryGetValue(scriptHash, out var _index) ? _index : 0;
balances.Add(new JObject
{
["assethash"] = scriptHash.ToString(),
["amount"] = balance.ToString(),
["lastupdatedblock"] = lastUpdatedBlock,
});
}
return(new JObject
{
["address"] = address.ToAddress(neoSystem.Settings.AddressVersion),
["balance"] = balances,
});
}
