public async Task <ValueTuple <uint, PathFindResponse> > PathFind(PathFindRequest request, CancellationToken cancellationToken = default)
{
jsonBuffer.Clear();
jsonWriter.Reset();
jsonWriter.WriteStartObject();
var requestId = WriteHeader(jsonWriter, "path_find");
jsonWriter.WriteString("subcommand", "create");
jsonWriter.WriteString("source_account", request.SourceAccount.ToString());
jsonWriter.WriteString("destination_account", request.DestinationAccount.ToString());
jsonWriter.WritePropertyName("destination_amount");
request.DestinationAmount.WriteJson(jsonWriter);
if (request.SendMax.HasValue)
{
jsonWriter.WritePropertyName("send_max");
request.SendMax.Value.WriteJson(jsonWriter);
}
if (request.SourceCurrencies != null)
{
jsonWriter.WriteStartArray("source_currencies");
foreach (var entry in request.SourceCurrencies)
{
entry.WriteJson(jsonWriter);
}
jsonWriter.WriteEndArray();
}
WriteFooter(jsonWriter);
jsonWriter.WriteEndObject();
jsonWriter.Flush();
var response = await SendReceiveAsync(requestId, jsonBuffer.WrittenMemory, cancellationToken);
return(requestId, new PathFindResponse(response));
}
public async Task TestGetPath_Event()
{
var accounts = await Task.WhenAll(TestAccount.Create(), TestAccount.Create(), TestAccount.Create(), TestAccount.Create());
await Utils.WaitForAccounts(Api, accounts);
var gbp = new CurrencyCode("GBP");
var A1 = accounts[0];
var A2 = accounts[1];
var G3 = accounts[2];
var M1 = accounts[3];
// Start listening for updates
var tcs = new TaskCompletionSource <PathFindResponse>();
var expectedId = new TaskCompletionSource <uint>();
Api.OnPathFind += (api, id, response) =>
{
Assert.Equal(expectedId.Task.Result, id);
Assert.Same(Api, api);
if (response.Alternatives.Count != 0)
{
tcs.TrySetResult(response);
}
};
// Ask for a path to send XRP to A2 from A1 via GBP
var pathFindRequest = new PathFindRequest();
pathFindRequest.SourceAccount = A1.Address;
pathFindRequest.DestinationAccount = A2.Address;
pathFindRequest.DestinationAmount = XrpAmount.FromXrp(10m);
pathFindRequest.SourceCurrencies = new[] { new CurrencyType(gbp) };
var(requestId, pathFindResponse) = await Api.PathFind(pathFindRequest);
expectedId.SetResult(requestId);
// Should be empty
Assert.Equal(pathFindRequest.SourceAccount, pathFindResponse.SourceAccount);
Assert.Equal(pathFindRequest.DestinationAccount, pathFindResponse.DestinationAccount);
Assert.Equal(pathFindRequest.DestinationAmount, pathFindResponse.DestinationAmount);
Assert.Empty(pathFindResponse.Alternatives);
// Set up trust lines, payments and offers
var accountSet = new AccountSetTransaction();
accountSet.Account = G3.Address;
accountSet.SetFlag = AccountSetFlags.DefaultRipple;
var(_, _) = await SubmitTransaction(G3.Secret, accountSet);
var trustSet = new TrustSetTransaction();
trustSet.LimitAmount = new IssuedAmount(G3.Address, gbp, new Currency(100m));
trustSet.Account = A1.Address;
var(_, _) = await SubmitTransaction(A1.Secret, trustSet);
trustSet.Account = A2.Address;
var(_, _) = await SubmitTransaction(A2.Secret, trustSet);
trustSet.LimitAmount = new IssuedAmount(G3.Address, gbp, new Currency(1000m));
trustSet.Account = M1.Address;
var(_, _) = await SubmitTransaction(M1.Secret, trustSet);
var payment = new PaymentTransaction();
payment.Account = G3.Address;
payment.Amount = new IssuedAmount(G3.Address, gbp, new Currency(50m));
payment.Destination = A1.Address;
var(_, _) = await SubmitTransaction(G3.Secret, payment);
payment.Destination = A2.Address;
var(_, _) = await SubmitTransaction(G3.Secret, payment);
payment.Amount = new IssuedAmount(G3.Address, gbp, new Currency(100m));
payment.Destination = M1.Address;
var(_, _) = await SubmitTransaction(G3.Secret, payment);
var offerCreate = new OfferCreateTransaction();
offerCreate.Account = M1.Address;
offerCreate.TakerPays = new IssuedAmount(G3.Address, gbp, new Currency(1m));
offerCreate.TakerGets = XrpAmount.FromXrp(10m);
var(_, _) = await SubmitTransaction(M1.Secret, offerCreate);
// Assert for the path that should eventually be found
void AssertPath(PathFindResponse pathFindResponse)
{
Assert.Equal(pathFindRequest.SourceAccount, pathFindResponse.SourceAccount);
Assert.Equal(pathFindRequest.DestinationAccount, pathFindResponse.DestinationAccount);
Assert.Equal(pathFindRequest.DestinationAmount, pathFindResponse.DestinationAmount);
var alternative = Assert.Single(pathFindResponse.Alternatives);
Assert.Equal(new IssuedAmount(A1.Address, gbp, new Currency(1m)), alternative.SourceAmount);
var path = Assert.Single(alternative.PathsComputed);
Assert.Collection(path,
item => Assert.Equal(G3.Address, item.Account),
item => Assert.Equal(CurrencyCode.XRP, item.Currency));
}
// Wait for the path to be found
pathFindResponse = tcs.Task.Result;
AssertPath(pathFindResponse);
// Ask for the path explictly
pathFindResponse = await Api.PathFindStatus();
AssertPath(pathFindResponse);
// ... and try and make a payment with that path
payment = new PaymentTransaction();
payment.Account = pathFindRequest.SourceAccount;
payment.Destination = pathFindRequest.DestinationAccount;
payment.Amount = pathFindRequest.DestinationAmount;
var alternative = Assert.Single(pathFindResponse.Alternatives);
payment.SendMax = alternative.SourceAmount;
payment.Paths = alternative.PathsComputed;
var(_, _) = await SubmitTransaction(A1.Secret, payment);
// Stop listening for the path
await Api.PathFindClose();
}
