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Flow_test.cpp
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//------------------------------------------------------------------------------
/*
This file is part of rippled: https://github.com/ripple/rippled
Copyright (c) 2012, 2013 Ripple Labs Inc.
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================
#include <test/jtx.h>
#include <test/jtx/PathSet.h>
#include <xrpld/app/paths/Flow.h>
#include <xrpld/app/paths/detail/Steps.h>
#include <xrpld/core/Config.h>
#include <xrpld/ledger/ApplyViewImpl.h>
#include <xrpld/ledger/PaymentSandbox.h>
#include <xrpld/ledger/Sandbox.h>
#include <xrpl/basics/contract.h>
#include <xrpl/protocol/Feature.h>
#include <xrpl/protocol/jss.h>
namespace ripple {
namespace test {
bool
getNoRippleFlag(
jtx::Env const& env,
jtx::Account const& src,
jtx::Account const& dst,
Currency const& cur)
{
if (auto sle = env.le(keylet::line(src, dst, cur)))
{
auto const flag =
(src.id() > dst.id()) ? lsfHighNoRipple : lsfLowNoRipple;
return sle->isFlag(flag);
}
Throw<std::runtime_error>("No line in getTrustFlag");
return false; // silence warning
}
struct Flow_test : public beast::unit_test::suite
{
void
testDirectStep(FeatureBitset features)
{
testcase("Direct Step");
using namespace jtx;
auto const alice = Account("alice");
auto const bob = Account("bob");
auto const carol = Account("carol");
auto const dan = Account("dan");
auto const erin = Account("erin");
auto const USDA = alice["USD"];
auto const USDB = bob["USD"];
auto const USDC = carol["USD"];
auto const USDD = dan["USD"];
auto const gw = Account("gw");
auto const USD = gw["USD"];
{
// Pay USD, trivial path
Env env(*this, features);
env.fund(XRP(10000), alice, bob, gw);
env.trust(USD(1000), alice, bob);
env(pay(gw, alice, USD(100)));
env(pay(alice, bob, USD(10)), paths(USD));
env.require(balance(bob, USD(10)));
}
{
// XRP transfer
Env env(*this, features);
env.fund(XRP(10000), alice, bob);
env(pay(alice, bob, XRP(100)));
env.require(balance(bob, XRP(10000 + 100)));
env.require(balance(alice, xrpMinusFee(env, 10000 - 100)));
}
{
// Partial payments
Env env(*this, features);
env.fund(XRP(10000), alice, bob, gw);
env.trust(USD(1000), alice, bob);
env(pay(gw, alice, USD(100)));
env(pay(alice, bob, USD(110)), paths(USD), ter(tecPATH_PARTIAL));
env.require(balance(bob, USD(0)));
env(pay(alice, bob, USD(110)),
paths(USD),
txflags(tfPartialPayment));
env.require(balance(bob, USD(100)));
}
{
// Pay by rippling through accounts, use path finder
Env env(*this, features);
env.fund(XRP(10000), alice, bob, carol, dan);
env.trust(USDA(10), bob);
env.trust(USDB(10), carol);
env.trust(USDC(10), dan);
env(pay(alice, dan, USDC(10)), paths(USDA));
env.require(
balance(bob, USDA(10)),
balance(carol, USDB(10)),
balance(dan, USDC(10)));
}
{
// Pay by rippling through accounts, specify path
// and charge a transfer fee
Env env(*this, features);
env.fund(XRP(10000), alice, bob, carol, dan);
env.trust(USDA(10), bob);
env.trust(USDB(10), alice, carol);
env.trust(USDC(10), dan);
env(rate(bob, 1.1));
// alice will redeem to bob; a transfer fee will be charged
env(pay(bob, alice, USDB(6)));
env(pay(alice, dan, USDC(5)),
path(bob, carol),
sendmax(USDA(6)),
txflags(tfNoRippleDirect));
env.require(balance(dan, USDC(5)));
env.require(balance(alice, USDB(0.5)));
}
{
// Pay by rippling through accounts, specify path and transfer fee
// Test that the transfer fee is not charged when alice issues
Env env(*this, features);
env.fund(XRP(10000), alice, bob, carol, dan);
env.trust(USDA(10), bob);
env.trust(USDB(10), alice, carol);
env.trust(USDC(10), dan);
env(rate(bob, 1.1));
env(pay(alice, dan, USDC(5)),
path(bob, carol),
sendmax(USDA(6)),
txflags(tfNoRippleDirect));
env.require(balance(dan, USDC(5)));
env.require(balance(bob, USDA(5)));
}
{
// test best quality path is taken
// Paths: A->B->D->E ; A->C->D->E
Env env(*this, features);
env.fund(XRP(10000), alice, bob, carol, dan, erin);
env.trust(USDA(10), bob, carol);
env.trust(USDB(10), dan);
env.trust(USDC(10), alice, dan);
env.trust(USDD(20), erin);
env(rate(bob, 1));
env(rate(carol, 1.1));
// Pay alice so she redeems to carol and a transfer fee is charged
env(pay(carol, alice, USDC(10)));
env(pay(alice, erin, USDD(5)),
path(carol, dan),
path(bob, dan),
txflags(tfNoRippleDirect));
env.require(balance(erin, USDD(5)));
env.require(balance(dan, USDB(5)));
env.require(balance(dan, USDC(0)));
}
{
// Limit quality
Env env(*this, features);
env.fund(XRP(10000), alice, bob, carol);
env.trust(USDA(10), bob);
env.trust(USDB(10), carol);
env(pay(alice, carol, USDB(5)),
sendmax(USDA(4)),
txflags(tfLimitQuality | tfPartialPayment),
ter(tecPATH_DRY));
env.require(balance(carol, USDB(0)));
env(pay(alice, carol, USDB(5)),
sendmax(USDA(4)),
txflags(tfPartialPayment));
env.require(balance(carol, USDB(4)));
}
}
void
testLineQuality(FeatureBitset features)
{
testcase("Line Quality");
using namespace jtx;
auto const alice = Account("alice");
auto const bob = Account("bob");
auto const carol = Account("carol");
auto const dan = Account("dan");
auto const USDA = alice["USD"];
auto const USDB = bob["USD"];
auto const USDC = carol["USD"];
auto const USDD = dan["USD"];
// Dan -> Bob -> Alice -> Carol; vary bobDanQIn and bobAliceQOut
for (auto bobDanQIn : {80, 100, 120})
for (auto bobAliceQOut : {80, 100, 120})
{
Env env(*this, features);
env.fund(XRP(10000), alice, bob, carol, dan);
env(trust(bob, USDD(100)), qualityInPercent(bobDanQIn));
env(trust(bob, USDA(100)), qualityOutPercent(bobAliceQOut));
env(trust(carol, USDA(100)));
env(pay(alice, bob, USDA(100)));
env.require(balance(bob, USDA(100)));
env(pay(dan, carol, USDA(10)),
path(bob),
sendmax(USDD(100)),
txflags(tfNoRippleDirect));
env.require(balance(bob, USDA(90)));
if (bobAliceQOut > bobDanQIn)
env.require(balance(
bob,
USDD(10.0 * double(bobAliceQOut) / double(bobDanQIn))));
else
env.require(balance(bob, USDD(10)));
env.require(balance(carol, USDA(10)));
}
// bob -> alice -> carol; vary carolAliceQIn
for (auto carolAliceQIn : {80, 100, 120})
{
Env env(*this, features);
env.fund(XRP(10000), alice, bob, carol);
env(trust(bob, USDA(10)));
env(trust(carol, USDA(10)), qualityInPercent(carolAliceQIn));
env(pay(alice, bob, USDA(10)));
env.require(balance(bob, USDA(10)));
env(pay(bob, carol, USDA(5)), sendmax(USDA(10)));
auto const effectiveQ =
carolAliceQIn > 100 ? 1.0 : carolAliceQIn / 100.0;
env.require(balance(bob, USDA(10.0 - 5.0 / effectiveQ)));
}
// bob -> alice -> carol; bobAliceQOut varies.
for (auto bobAliceQOut : {80, 100, 120})
{
Env env(*this, features);
env.fund(XRP(10000), alice, bob, carol);
env(trust(bob, USDA(10)), qualityOutPercent(bobAliceQOut));
env(trust(carol, USDA(10)));
env(pay(alice, bob, USDA(10)));
env.require(balance(bob, USDA(10)));
env(pay(bob, carol, USDA(5)), sendmax(USDA(5)));
env.require(balance(carol, USDA(5)));
env.require(balance(bob, USDA(10 - 5)));
}
}
void
testBookStep(FeatureBitset features)
{
testcase("Book Step");
using namespace jtx;
auto const gw = Account("gateway");
auto const USD = gw["USD"];
auto const BTC = gw["BTC"];
auto const EUR = gw["EUR"];
Account const alice("alice");
Account const bob("bob");
Account const carol("carol");
{
// simple IOU/IOU offer
Env env(*this, features);
env.fund(XRP(10000), alice, bob, carol, gw);
env.trust(USD(1000), alice, bob, carol);
env.trust(BTC(1000), alice, bob, carol);
env(pay(gw, alice, BTC(50)));
env(pay(gw, bob, USD(50)));
env(offer(bob, BTC(50), USD(50)));
env(pay(alice, carol, USD(50)), path(~USD), sendmax(BTC(50)));
env.require(balance(alice, BTC(0)));
env.require(balance(bob, BTC(50)));
env.require(balance(bob, USD(0)));
env.require(balance(carol, USD(50)));
BEAST_EXPECT(!isOffer(env, bob, BTC(50), USD(50)));
}
{
// simple IOU/XRP XRP/IOU offer
Env env(*this, features);
env.fund(XRP(10000), alice, bob, carol, gw);
env.trust(USD(1000), alice, bob, carol);
env.trust(BTC(1000), alice, bob, carol);
env(pay(gw, alice, BTC(50)));
env(pay(gw, bob, USD(50)));
env(offer(bob, BTC(50), XRP(50)));
env(offer(bob, XRP(50), USD(50)));
env(pay(alice, carol, USD(50)), path(~XRP, ~USD), sendmax(BTC(50)));
env.require(balance(alice, BTC(0)));
env.require(balance(bob, BTC(50)));
env.require(balance(bob, USD(0)));
env.require(balance(carol, USD(50)));
BEAST_EXPECT(!isOffer(env, bob, XRP(50), USD(50)));
BEAST_EXPECT(!isOffer(env, bob, BTC(50), XRP(50)));
}
{
// simple XRP -> USD through offer and sendmax
Env env(*this, features);
env.fund(XRP(10000), alice, bob, carol, gw);
env.trust(USD(1000), alice, bob, carol);
env.trust(BTC(1000), alice, bob, carol);
env(pay(gw, bob, USD(50)));
env(offer(bob, XRP(50), USD(50)));
env(pay(alice, carol, USD(50)), path(~USD), sendmax(XRP(50)));
env.require(balance(alice, xrpMinusFee(env, 10000 - 50)));
env.require(balance(bob, xrpMinusFee(env, 10000 + 50)));
env.require(balance(bob, USD(0)));
env.require(balance(carol, USD(50)));
BEAST_EXPECT(!isOffer(env, bob, XRP(50), USD(50)));
}
{
// simple USD -> XRP through offer and sendmax
Env env(*this, features);
env.fund(XRP(10000), alice, bob, carol, gw);
env.trust(USD(1000), alice, bob, carol);
env.trust(BTC(1000), alice, bob, carol);
env(pay(gw, alice, USD(50)));
env(offer(bob, USD(50), XRP(50)));
env(pay(alice, carol, XRP(50)), path(~XRP), sendmax(USD(50)));
env.require(balance(alice, USD(0)));
env.require(balance(bob, xrpMinusFee(env, 10000 - 50)));
env.require(balance(bob, USD(50)));
env.require(balance(carol, XRP(10000 + 50)));
BEAST_EXPECT(!isOffer(env, bob, USD(50), XRP(50)));
}
{
// test unfunded offers are removed when payment succeeds
Env env(*this, features);
env.fund(XRP(10000), alice, bob, carol, gw);
env.trust(USD(1000), alice, bob, carol);
env.trust(BTC(1000), alice, bob, carol);
env.trust(EUR(1000), alice, bob, carol);
env(pay(gw, alice, BTC(60)));
env(pay(gw, bob, USD(50)));
env(pay(gw, bob, EUR(50)));
env(offer(bob, BTC(50), USD(50)));
env(offer(bob, BTC(40), EUR(50)));
env(offer(bob, EUR(50), USD(50)));
// unfund offer
env(pay(bob, gw, EUR(50)));
BEAST_EXPECT(isOffer(env, bob, BTC(50), USD(50)));
BEAST_EXPECT(isOffer(env, bob, BTC(40), EUR(50)));
BEAST_EXPECT(isOffer(env, bob, EUR(50), USD(50)));
env(pay(alice, carol, USD(50)),
path(~USD),
path(~EUR, ~USD),
sendmax(BTC(60)));
env.require(balance(alice, BTC(10)));
env.require(balance(bob, BTC(50)));
env.require(balance(bob, USD(0)));
env.require(balance(bob, EUR(0)));
env.require(balance(carol, USD(50)));
// used in the payment
BEAST_EXPECT(!isOffer(env, bob, BTC(50), USD(50)));
// found unfunded
BEAST_EXPECT(!isOffer(env, bob, BTC(40), EUR(50)));
// unfunded, but should not yet be found unfunded
BEAST_EXPECT(isOffer(env, bob, EUR(50), USD(50)));
}
{
// test unfunded offers are returned when the payment fails.
// bob makes two offers: a funded 50 USD for 50 BTC and an unfunded
// 50 EUR for 60 BTC. alice pays carol 61 USD with 61 BTC. alice
// only has 60 BTC, so the payment will fail. The payment uses two
// paths: one through bob's funded offer and one through his
// unfunded offer. When the payment fails `flow` should return the
// unfunded offer. This test is intentionally similar to the one
// that removes unfunded offers when the payment succeeds.
Env env(*this, features);
env.fund(XRP(10000), alice, bob, carol, gw);
env.trust(USD(1000), alice, bob, carol);
env.trust(BTC(1000), alice, bob, carol);
env.trust(EUR(1000), alice, bob, carol);
env(pay(gw, alice, BTC(60)));
env(pay(gw, bob, USD(60)));
env(pay(gw, bob, EUR(50)));
env(pay(gw, carol, EUR(1)));
env(offer(bob, BTC(50), USD(50)));
env(offer(bob, BTC(60), EUR(50)));
env(offer(carol, BTC(1000), EUR(1)));
env(offer(bob, EUR(50), USD(50)));
// unfund offer
env(pay(bob, gw, EUR(50)));
BEAST_EXPECT(isOffer(env, bob, BTC(50), USD(50)));
BEAST_EXPECT(isOffer(env, bob, BTC(60), EUR(50)));
BEAST_EXPECT(isOffer(env, carol, BTC(1000), EUR(1)));
auto flowJournal = env.app().logs().journal("Flow");
auto const flowResult = [&] {
STAmount deliver(USD(51));
STAmount smax(BTC(61));
PaymentSandbox sb(env.current().get(), tapNONE);
STPathSet paths;
auto IPE = [](Issue const& iss) {
return STPathElement(
STPathElement::typeCurrency | STPathElement::typeIssuer,
xrpAccount(),
iss.currency,
iss.account);
};
{
// BTC -> USD
STPath p1({IPE(USD.issue())});
paths.push_back(p1);
// BTC -> EUR -> USD
STPath p2({IPE(EUR.issue()), IPE(USD.issue())});
paths.push_back(p2);
}
return flow(
sb,
deliver,
alice,
carol,
paths,
false,
false,
true,
OfferCrossing::no,
std::nullopt,
smax,
flowJournal);
}();
BEAST_EXPECT(flowResult.removableOffers.size() == 1);
env.app().openLedger().modify(
[&](OpenView& view, beast::Journal j) {
if (flowResult.removableOffers.empty())
return false;
Sandbox sb(&view, tapNONE);
for (auto const& o : flowResult.removableOffers)
if (auto ok = sb.peek(keylet::offer(o)))
offerDelete(sb, ok, flowJournal);
sb.apply(view);
return true;
});
// used in payment, but since payment failed should be untouched
BEAST_EXPECT(isOffer(env, bob, BTC(50), USD(50)));
BEAST_EXPECT(isOffer(env, carol, BTC(1000), EUR(1)));
// found unfunded
BEAST_EXPECT(!isOffer(env, bob, BTC(60), EUR(50)));
}
{
// Do not produce more in the forward pass than the reverse pass
// This test uses a path that whose reverse pass will compute a
// 0.5 USD input required for a 1 EUR output. It sets a sendmax of
// 0.4 USD, so the payment engine will need to do a forward pass.
// Without limits, the 0.4 USD would produce 1000 EUR in the forward
// pass. This test checks that the payment produces 1 EUR, as
// expected.
Env env(*this, features);
env.fund(XRP(10000), alice, bob, carol, gw);
env.trust(USD(1000), alice, bob, carol);
env.trust(EUR(1000), alice, bob, carol);
env(pay(gw, alice, USD(1000)));
env(pay(gw, bob, EUR(1000)));
Keylet const bobUsdOffer = keylet::offer(bob, env.seq(bob));
env(offer(bob, USD(1), drops(2)), txflags(tfPassive));
env(offer(bob, drops(1), EUR(1000)), txflags(tfPassive));
bool const reducedOffersV2 = features[fixReducedOffersV2];
// With reducedOffersV2, it is not allowed to accept less than
// USD(0.5) of bob's USD offer. If we provide 1 drop for less
// than USD(0.5), then the remaining fractional offer would
// block the order book.
TER const expectedTER =
reducedOffersV2 ? TER(tecPATH_DRY) : TER(tesSUCCESS);
env(pay(alice, carol, EUR(1)),
path(~XRP, ~EUR),
sendmax(USD(0.4)),
txflags(tfNoRippleDirect | tfPartialPayment),
ter(expectedTER));
if (!reducedOffersV2)
{
env.require(balance(carol, EUR(1)));
env.require(balance(bob, USD(0.4)));
env.require(balance(bob, EUR(999)));
// Show that bob's USD offer is now a blocker.
std::shared_ptr<SLE const> const usdOffer = env.le(bobUsdOffer);
if (BEAST_EXPECT(usdOffer))
{
std::uint64_t const bookRate = [&usdOffer]() {
// Extract the least significant 64 bits from the
// book page. That's where the quality is stored.
std::string bookDirStr =
to_string(usdOffer->at(sfBookDirectory));
bookDirStr.erase(0, 48);
return std::stoull(bookDirStr, nullptr, 16);
}();
std::uint64_t const actualRate = getRate(
usdOffer->at(sfTakerGets), usdOffer->at(sfTakerPays));
// We expect the actual rate of the offer to be worse
// (larger) than the rate of the book page holding the
// offer. This is a defect which is corrected by
// fixReducedOffersV2.
BEAST_EXPECT(actualRate > bookRate);
}
}
}
}
void
testTransferRate(FeatureBitset features)
{
testcase("Transfer Rate");
using namespace jtx;
auto const gw = Account("gateway");
auto const USD = gw["USD"];
auto const BTC = gw["BTC"];
auto const EUR = gw["EUR"];
Account const alice("alice");
Account const bob("bob");
Account const carol("carol");
{
// Simple payment through a gateway with a
// transfer rate
Env env(*this, features);
env.fund(XRP(10000), alice, bob, carol, gw);
env(rate(gw, 1.25));
env.trust(USD(1000), alice, bob, carol);
env(pay(gw, alice, USD(50)));
env.require(balance(alice, USD(50)));
env(pay(alice, bob, USD(40)), sendmax(USD(50)));
env.require(balance(bob, USD(40)), balance(alice, USD(0)));
}
{
// transfer rate is not charged when issuer is src or dst
Env env(*this, features);
env.fund(XRP(10000), alice, bob, carol, gw);
env(rate(gw, 1.25));
env.trust(USD(1000), alice, bob, carol);
env(pay(gw, alice, USD(50)));
env.require(balance(alice, USD(50)));
env(pay(alice, gw, USD(40)), sendmax(USD(40)));
env.require(balance(alice, USD(10)));
}
{
// transfer fee on an offer
Env env(*this, features);
env.fund(XRP(10000), alice, bob, carol, gw);
env(rate(gw, 1.25));
env.trust(USD(1000), alice, bob, carol);
env(pay(gw, bob, USD(65)));
env(offer(bob, XRP(50), USD(50)));
env(pay(alice, carol, USD(50)), path(~USD), sendmax(XRP(50)));
env.require(
balance(alice, xrpMinusFee(env, 10000 - 50)),
balance(bob, USD(2.5)), // owner pays transfer fee
balance(carol, USD(50)));
}
{
// Transfer fee two consecutive offers
Env env(*this, features);
env.fund(XRP(10000), alice, bob, carol, gw);
env(rate(gw, 1.25));
env.trust(USD(1000), alice, bob, carol);
env.trust(EUR(1000), alice, bob, carol);
env(pay(gw, bob, USD(50)));
env(pay(gw, bob, EUR(50)));
env(offer(bob, XRP(50), USD(50)));
env(offer(bob, USD(50), EUR(50)));
env(pay(alice, carol, EUR(40)), path(~USD, ~EUR), sendmax(XRP(40)));
env.require(
balance(alice, xrpMinusFee(env, 10000 - 40)),
balance(bob, USD(40)),
balance(bob, EUR(0)),
balance(carol, EUR(40)));
}
{
// First pass through a strand redeems, second pass issues, no
// offers limiting step is not an endpoint
Env env(*this, features);
auto const USDA = alice["USD"];
auto const USDB = bob["USD"];
env.fund(XRP(10000), alice, bob, carol, gw);
env(rate(gw, 1.25));
env.trust(USD(1000), alice, bob, carol);
env.trust(USDA(1000), bob);
env.trust(USDB(1000), gw);
env(pay(gw, bob, USD(50)));
// alice -> bob -> gw -> carol. $50 should have transfer fee; $10,
// no fee
env(pay(alice, carol, USD(50)), path(bob), sendmax(USDA(60)));
env.require(
balance(bob, USD(-10)),
balance(bob, USDA(60)),
balance(carol, USD(50)));
}
{
// First pass through a strand redeems, second pass issues, through
// an offer limiting step is not an endpoint
Env env(*this, features);
auto const USDA = alice["USD"];
auto const USDB = bob["USD"];
Account const dan("dan");
env.fund(XRP(10000), alice, bob, carol, dan, gw);
env(rate(gw, 1.25));
env.trust(USD(1000), alice, bob, carol, dan);
env.trust(EUR(1000), carol, dan);
env.trust(USDA(1000), bob);
env.trust(USDB(1000), gw);
env(pay(gw, bob, USD(50)));
env(pay(gw, dan, EUR(100)));
env(offer(dan, USD(100), EUR(100)));
// alice -> bob -> gw -> carol. $50 should have transfer fee; $10,
// no fee
env(pay(alice, carol, EUR(50)),
path(bob, gw, ~EUR),
sendmax(USDA(60)),
txflags(tfNoRippleDirect));
env.require(
balance(bob, USD(-10)),
balance(bob, USDA(60)),
balance(dan, USD(50)),
balance(dan, EUR(37.5)),
balance(carol, EUR(50)));
}
{
// Offer where the owner is also the issuer, owner pays fee
Env env(*this, features);
env.fund(XRP(10000), alice, bob, gw);
env(rate(gw, 1.25));
env.trust(USD(1000), alice, bob);
env(offer(gw, XRP(100), USD(100)));
env(pay(alice, bob, USD(100)), sendmax(XRP(100)));
env.require(
balance(alice, xrpMinusFee(env, 10000 - 100)),
balance(bob, USD(100)));
}
if (!features[featureOwnerPaysFee])
{
// Offer where the owner is also the issuer, sender pays fee
Env env(*this, features);
env.fund(XRP(10000), alice, bob, gw);
env(rate(gw, 1.25));
env.trust(USD(1000), alice, bob);
env(offer(gw, XRP(125), USD(125)));
env(pay(alice, bob, USD(100)), sendmax(XRP(200)));
env.require(
balance(alice, xrpMinusFee(env, 10000 - 125)),
balance(bob, USD(100)));
}
}
void
testFalseDry(FeatureBitset features)
{
testcase("falseDryChanges");
using namespace jtx;
auto const gw = Account("gateway");
auto const USD = gw["USD"];
auto const EUR = gw["EUR"];
Account const alice("alice");
Account const bob("bob");
Account const carol("carol");
Env env(*this, features);
env.fund(XRP(10000), alice, carol, gw);
env.fund(reserve(env, 5), bob);
env.trust(USD(1000), alice, bob, carol);
env.trust(EUR(1000), alice, bob, carol);
env(pay(gw, alice, EUR(50)));
env(pay(gw, bob, USD(50)));
// Bob has _just_ slightly less than 50 xrp available
// If his owner count changes, he will have more liquidity.
// This is one error case to test (when Flow is used).
// Computing the incoming xrp to the XRP/USD offer will require two
// recursive calls to the EUR/XRP offer. The second call will return
// tecPATH_DRY, but the entire path should not be marked as dry. This
// is the second error case to test (when flowV1 is used).
env(offer(bob, EUR(50), XRP(50)));
env(offer(bob, XRP(50), USD(50)));
env(pay(alice, carol, USD(1000000)),
path(~XRP, ~USD),
sendmax(EUR(500)),
txflags(tfNoRippleDirect | tfPartialPayment));
auto const carolUSD = env.balance(carol, USD).value();
BEAST_EXPECT(carolUSD > USD(0) && carolUSD < USD(50));
}
void
testLimitQuality()
{
// Single path with two offers and limit quality. The quality limit is
// such that the first offer should be taken but the second should not.
// The total amount delivered should be the sum of the two offers and
// sendMax should be more than the first offer.
testcase("limitQuality");
using namespace jtx;
auto const gw = Account("gateway");
auto const USD = gw["USD"];
Account const alice("alice");
Account const bob("bob");
Account const carol("carol");
{
Env env(*this);
env.fund(XRP(10000), alice, bob, carol, gw);
env.trust(USD(100), alice, bob, carol);
env(pay(gw, bob, USD(100)));
env(offer(bob, XRP(50), USD(50)));
env(offer(bob, XRP(100), USD(50)));
env(pay(alice, carol, USD(100)),
path(~USD),
sendmax(XRP(100)),
txflags(tfNoRippleDirect | tfPartialPayment | tfLimitQuality));
env.require(balance(carol, USD(50)));
}
}
// Helper function that returns the reserve on an account based on
// the passed in number of owners.
static XRPAmount
reserve(jtx::Env& env, std::uint32_t count)
{
return env.current()->fees().accountReserve(count);
}
// Helper function that returns the Offers on an account.
static std::vector<std::shared_ptr<SLE const>>
offersOnAccount(jtx::Env& env, jtx::Account account)
{
std::vector<std::shared_ptr<SLE const>> result;
forEachItem(
*env.current(),
account,
[&result](std::shared_ptr<SLE const> const& sle) {
if (sle->getType() == ltOFFER)
result.push_back(sle);
});
return result;
}
void
testSelfPayment1(FeatureBitset features)
{
testcase("Self-payment 1");
// In this test case the new flow code mis-computes the amount
// of money to move. Fortunately the new code's re-execute
// check catches the problem and throws out the transaction.
//
// The old payment code handles the payment correctly.
using namespace jtx;
auto const gw1 = Account("gw1");
auto const gw2 = Account("gw2");
auto const alice = Account("alice");
auto const USD = gw1["USD"];
auto const EUR = gw2["EUR"];
Env env(*this, features);
env.fund(XRP(1000000), gw1, gw2);
env.close();
// The fee that's charged for transactions.
auto const f = env.current()->fees().base;
env.fund(reserve(env, 3) + f * 4, alice);
env.close();
env(trust(alice, USD(2000)));
env(trust(alice, EUR(2000)));
env.close();
env(pay(gw1, alice, USD(1)));
env(pay(gw2, alice, EUR(1000)));
env.close();
env(offer(alice, USD(500), EUR(600)));
env.close();
env.require(owners(alice, 3));
env.require(balance(alice, USD(1)));
env.require(balance(alice, EUR(1000)));
auto aliceOffers = offersOnAccount(env, alice);
BEAST_EXPECT(aliceOffers.size() == 1);
for (auto const& offerPtr : aliceOffers)
{
auto const offer = *offerPtr;
BEAST_EXPECT(offer[sfLedgerEntryType] == ltOFFER);
BEAST_EXPECT(offer[sfTakerGets] == EUR(600));
BEAST_EXPECT(offer[sfTakerPays] == USD(500));
}
env(pay(alice, alice, EUR(600)),
sendmax(USD(500)),
txflags(tfPartialPayment));
env.close();
env.require(owners(alice, 3));
env.require(balance(alice, USD(1)));
env.require(balance(alice, EUR(1000)));
aliceOffers = offersOnAccount(env, alice);
BEAST_EXPECT(aliceOffers.size() == 1);
for (auto const& offerPtr : aliceOffers)
{
auto const offer = *offerPtr;
BEAST_EXPECT(offer[sfLedgerEntryType] == ltOFFER);
BEAST_EXPECT(offer[sfTakerGets] == EUR(598.8));
BEAST_EXPECT(offer[sfTakerPays] == USD(499));
}
}
void
testSelfPayment2(FeatureBitset features)
{
testcase("Self-payment 2");
// In this case the difference between the old payment code and
// the new is the values left behind in the offer. Not saying either
// ios ring, they are just different.
using namespace jtx;
auto const gw1 = Account("gw1");
auto const gw2 = Account("gw2");
auto const alice = Account("alice");
auto const USD = gw1["USD"];
auto const EUR = gw2["EUR"];
Env env(*this, features);
env.fund(XRP(1000000), gw1, gw2);
env.close();
// The fee that's charged for transactions.
auto const f = env.current()->fees().base;
env.fund(reserve(env, 3) + f * 4, alice);
env.close();
env(trust(alice, USD(506)));
env(trust(alice, EUR(606)));
env.close();
env(pay(gw1, alice, USD(500)));
env(pay(gw2, alice, EUR(600)));
env.close();
env(offer(alice, USD(500), EUR(600)));
env.close();
env.require(owners(alice, 3));
env.require(balance(alice, USD(500)));
env.require(balance(alice, EUR(600)));
auto aliceOffers = offersOnAccount(env, alice);
BEAST_EXPECT(aliceOffers.size() == 1);
for (auto const& offerPtr : aliceOffers)
{
auto const offer = *offerPtr;
BEAST_EXPECT(offer[sfLedgerEntryType] == ltOFFER);
BEAST_EXPECT(offer[sfTakerGets] == EUR(600));
BEAST_EXPECT(offer[sfTakerPays] == USD(500));
}
env(pay(alice, alice, EUR(60)),
sendmax(USD(50)),
txflags(tfPartialPayment));
env.close();
env.require(owners(alice, 3));
env.require(balance(alice, USD(500)));
env.require(balance(alice, EUR(600)));
aliceOffers = offersOnAccount(env, alice);
BEAST_EXPECT(aliceOffers.size() == 1);
for (auto const& offerPtr : aliceOffers)
{
auto const offer = *offerPtr;
BEAST_EXPECT(offer[sfLedgerEntryType] == ltOFFER);
BEAST_EXPECT(offer[sfTakerGets] == EUR(594));
BEAST_EXPECT(offer[sfTakerPays] == USD(495));
}
}
void
testSelfFundedXRPEndpoint(bool consumeOffer, FeatureBitset features)
{
// Test that the deferred credit table is not bypassed for
// XRPEndpointSteps. If the account in the first step is sending XRP and
// that account also owns an offer that receives XRP, it should not be
// possible for that step to use the XRP received in the offer as part
// of the payment.
testcase("Self funded XRPEndpoint");
using namespace jtx;
Env env(*this, features);
auto const alice = Account("alice");
auto const gw = Account("gw");
auto const USD = gw["USD"];
env.fund(XRP(10000), alice, gw);
env(trust(alice, USD(20)));
env(pay(gw, alice, USD(10)));
env(offer(alice, XRP(50000), USD(10)));
// Consuming the offer changes the owner count, which could also cause
// liquidity to decrease in the forward pass
auto const toSend = consumeOffer ? USD(10) : USD(9);
env(pay(alice, alice, toSend),
path(~USD),
sendmax(XRP(20000)),
txflags(tfPartialPayment | tfNoRippleDirect));