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CrossingLimits_test.cpp
1#include <test/jtx.h>
2
3#include <xrpl/beast/unit_test.h>
4#include <xrpl/protocol/Feature.h>
5
6namespace ripple {
7namespace test {
8
9class CrossingLimits_test : public beast::unit_test::suite
10{
11public:
12 void
13 testStepLimit(FeatureBitset features)
14 {
15 testcase("Step Limit");
16
17 using namespace jtx;
18 Env env(*this, features);
19
20 auto const gw = Account("gateway");
21 auto const USD = gw["USD"];
22
23 env.fund(XRP(100000000), gw, "alice", "bob", "carol", "dan");
24 env.trust(USD(1), "bob");
25 env(pay(gw, "bob", USD(1)));
26 env.trust(USD(1), "dan");
27 env(pay(gw, "dan", USD(1)));
28 n_offers(env, 2000, "bob", XRP(1), USD(1));
29 n_offers(env, 1, "dan", XRP(1), USD(1));
30
31 // Alice offers to buy 1000 XRP for 1000 USD. She takes Bob's first
32 // offer, removes 999 more as unfunded, then hits the step limit.
33 env(offer("alice", USD(1000), XRP(1000)));
34 env.require(balance("alice", USD(1)));
35 env.require(owners("alice", 2));
36 env.require(balance("bob", USD(0)));
37 env.require(owners("bob", 1001));
38 env.require(balance("dan", USD(1)));
39 env.require(owners("dan", 2));
40
41 // Carol offers to buy 1000 XRP for 1000 USD. She removes Bob's next
42 // 1000 offers as unfunded and hits the step limit.
43 env(offer("carol", USD(1000), XRP(1000)));
44 env.require(balance("carol", USD(none)));
45 env.require(owners("carol", 1));
46 env.require(balance("bob", USD(0)));
47 env.require(owners("bob", 1));
48 env.require(balance("dan", USD(1)));
49 env.require(owners("dan", 2));
50 }
51
52 void
53 testCrossingLimit(FeatureBitset features)
54 {
55 testcase("Crossing Limit");
56
57 using namespace jtx;
58 Env env(*this, features);
59
60 auto const gw = Account("gateway");
61 auto const USD = gw["USD"];
62
63 // The payment engine allows 1000 offers to cross.
64 int const maxConsumed = 1000;
65
66 env.fund(XRP(100000000), gw, "alice", "bob", "carol");
67 int const bobsOfferCount = maxConsumed + 150;
68 env.trust(USD(bobsOfferCount), "bob");
69 env(pay(gw, "bob", USD(bobsOfferCount)));
70 env.close();
71 n_offers(env, bobsOfferCount, "bob", XRP(1), USD(1));
72
73 // Alice offers to buy Bob's offers. However she hits the offer
74 // crossing limit, so she can't buy them all at once.
75 env(offer("alice", USD(bobsOfferCount), XRP(bobsOfferCount)));
76 env.close();
77 env.require(balance("alice", USD(maxConsumed)));
78 env.require(balance("bob", USD(150)));
79 env.require(owners("bob", 150 + 1));
80
81 // Carol offers to buy 1000 XRP for 1000 USD. She takes Bob's
82 // remaining 150 offers without hitting a limit.
83 env(offer("carol", USD(1000), XRP(1000)));
84 env.close();
85 env.require(balance("carol", USD(150)));
86 env.require(balance("bob", USD(0)));
87 env.require(owners("bob", 1));
88 }
89
90 void
91 testStepAndCrossingLimit(FeatureBitset features)
92 {
93 testcase("Step And Crossing Limit");
94
95 using namespace jtx;
96 Env env(*this, features);
97
98 auto const gw = Account("gateway");
99 auto const USD = gw["USD"];
100
101 env.fund(XRP(100000000), gw, "alice", "bob", "carol", "dan", "evita");
102
103 // The payment engine allows 1000 offers to cross.
104 int const maxConsumed = 1000;
105
106 int const evitasOfferCount{maxConsumed + 49};
107 env.trust(USD(1000), "alice");
108 env(pay(gw, "alice", USD(1000)));
109 env.trust(USD(1000), "carol");
110 env(pay(gw, "carol", USD(1)));
111 env.trust(USD(evitasOfferCount + 1), "evita");
112 env(pay(gw, "evita", USD(evitasOfferCount + 1)));
113
114 // The payment engine has a limit of 1000 funded or unfunded offers.
115 int const carolsOfferCount{700};
116 n_offers(env, 400, "alice", XRP(1), USD(1));
117 n_offers(env, carolsOfferCount, "carol", XRP(1), USD(1));
118 n_offers(env, evitasOfferCount, "evita", XRP(1), USD(1));
119
120 // Bob offers to buy 1000 XRP for 1000 USD. He takes all 400 USD from
121 // Alice's offers, 1 USD from Carol's and then removes 599 of Carol's
122 // offers as unfunded, before hitting the step limit.
123 env(offer("bob", USD(1000), XRP(1000)));
124 env.require(balance("bob", USD(401)));
125 env.require(balance("alice", USD(600)));
126 env.require(owners("alice", 1));
127 env.require(balance("carol", USD(0)));
128 env.require(owners("carol", carolsOfferCount - 599));
129 env.require(balance("evita", USD(evitasOfferCount + 1)));
130 env.require(owners("evita", evitasOfferCount + 1));
131
132 // Dan offers to buy maxConsumed + 50 XRP USD. He removes all of
133 // Carol's remaining offers as unfunded, then takes
134 // (maxConsumed - 100) USD from Evita's, hitting the crossing limit.
135 env(offer("dan", USD(maxConsumed + 50), XRP(maxConsumed + 50)));
136 env.require(balance("dan", USD(maxConsumed - 100)));
137 env.require(owners("dan", 2));
138 env.require(balance("alice", USD(600)));
139 env.require(owners("alice", 1));
140 env.require(balance("carol", USD(0)));
141 env.require(owners("carol", 1));
142 env.require(balance("evita", USD(150)));
143 env.require(owners("evita", 150));
144 }
145
146 void
147 testAutoBridgedLimitsTaker(FeatureBitset features)
148 {
149 testcase("Auto Bridged Limits Taker");
150
151 using namespace jtx;
152 Env env(*this, features);
153
154 auto const gw = Account("gateway");
155 auto const USD = gw["USD"];
156 auto const EUR = gw["EUR"];
157
158 env.fund(XRP(100000000), gw, "alice", "bob", "carol", "dan", "evita");
159
160 env.trust(USD(2000), "alice");
161 env(pay(gw, "alice", USD(2000)));
162 env.trust(USD(1000), "carol");
163 env(pay(gw, "carol", USD(3)));
164 env.trust(USD(1000), "evita");
165 env(pay(gw, "evita", USD(1000)));
166
167 n_offers(env, 302, "alice", EUR(2), XRP(1));
168 n_offers(env, 300, "alice", XRP(1), USD(4));
169 n_offers(env, 497, "carol", XRP(1), USD(3));
170 n_offers(env, 1001, "evita", EUR(1), USD(1));
171
172 // Bob offers to buy 2000 USD for 2000 EUR, even though he only has
173 // 1000 EUR.
174 // 1. He spends 600 EUR taking Alice's auto-bridged offers and
175 // gets 1200 USD for that.
176 // 2. He spends another 2 EUR taking one of Alice's EUR->XRP and
177 // one of Carol's XRP-USD offers. He gets 3 USD for that.
178 // 3. The remainder of Carol's offers are now unfunded. We've
179 // consumed 602 offers so far. We now chew through 398 more
180 // of Carol's unfunded offers until we hit the 1000 offer limit.
181 // This sets have_bridge to false -- we will handle no more
182 // bridged offers.
183 // 4. However, have_direct is still true. So we go around one more
184 // time and take one of Evita's offers.
185 // 5. After taking one of Evita's offers we notice (again) that our
186 // offer count was exceeded. So we completely stop after taking
187 // one of Evita's offers.
188 env.trust(EUR(10000), "bob");
189 env.close();
190 env(pay(gw, "bob", EUR(1000)));
191 env.close();
192 env(offer("bob", USD(2000), EUR(2000)));
193 env.require(balance("bob", USD(1204)));
194 env.require(balance("bob", EUR(397)));
195
196 env.require(balance("alice", USD(800)));
197 env.require(balance("alice", EUR(602)));
198 env.require(offers("alice", 1));
199 env.require(owners("alice", 3));
200
201 env.require(balance("carol", USD(0)));
202 env.require(balance("carol", EUR(none)));
203 env.require(offers("carol", 100));
204 env.require(owners("carol", 101));
205
206 env.require(balance("evita", USD(999)));
207 env.require(balance("evita", EUR(1)));
208 env.require(offers("evita", 1000));
209 env.require(owners("evita", 1002));
210
211 // Dan offers to buy 900 EUR for 900 USD.
212 // 1. He removes all 100 of Carol's remaining unfunded offers.
213 // 2. Then takes 850 USD from Evita's offers.
214 // 3. Consuming 850 of Evita's funded offers hits the crossing
215 // limit. So Dan's offer crossing stops even though he would
216 // be willing to take another 50 of Evita's offers.
217 env.trust(EUR(10000), "dan");
218 env.close();
219 env(pay(gw, "dan", EUR(1000)));
220 env.close();
221
222 env(offer("dan", USD(900), EUR(900)));
223 env.require(balance("dan", USD(850)));
224 env.require(balance("dan", EUR(150)));
225
226 env.require(balance("alice", USD(800)));
227 env.require(balance("alice", EUR(602)));
228 env.require(offers("alice", 1));
229 env.require(owners("alice", 3));
230
231 env.require(balance("carol", USD(0)));
232 env.require(balance("carol", EUR(none)));
233 env.require(offers("carol", 0));
234 env.require(owners("carol", 1));
235
236 env.require(balance("evita", USD(149)));
237 env.require(balance("evita", EUR(851)));
238 env.require(offers("evita", 150));
239 env.require(owners("evita", 152));
240 }
241
242 void
243 testAutoBridgedLimits(FeatureBitset features)
244 {
245 testcase("Auto Bridged Limits");
246
247 // If any book step in a payment strand consumes 1000 offers, the
248 // liquidity from the offers is used, but that strand will be marked as
249 // dry for the remainder of the transaction.
250
251 using namespace jtx;
252
253 auto const gw = Account("gateway");
254 auto const alice = Account("alice");
255 auto const bob = Account("bob");
256 auto const carol = Account("carol");
257
258 auto const USD = gw["USD"];
259 auto const EUR = gw["EUR"];
260
261 // There are two almost identical tests. There is a strand with a large
262 // number of unfunded offers that will cause the strand to be marked dry
263 // even though there will still be liquidity available on that strand.
264 // In the first test, the strand has the best initial quality. In the
265 // second test the strand does not have the best quality (the
266 // implementation has to handle this case correct and not mark the
267 // strand dry until the liquidity is actually used)
268
269 // The implementation allows any single step to consume at most 1000
270 // offers. With the `FlowSortStrands` feature enabled, if the total
271 // number of offers consumed by all the steps combined exceeds 1500, the
272 // payment stops.
273 {
274 Env env(*this, features);
275
276 env.fund(XRP(100000000), gw, alice, bob, carol);
277
278 env.trust(USD(4000), alice);
279 env(pay(gw, alice, USD(4000)));
280 env.trust(USD(1000), carol);
281 env(pay(gw, carol, USD(3)));
282
283 // Notice the strand with the 800 unfunded offers has the initial
284 // best quality
285 n_offers(env, 2000, alice, EUR(2), XRP(1));
286 n_offers(env, 100, alice, XRP(1), USD(4));
287 n_offers(
288 env, 801, carol, XRP(1), USD(3)); // only one offer is funded
289 n_offers(env, 1000, alice, XRP(1), USD(3));
290
291 n_offers(env, 1, alice, EUR(500), USD(500));
292
293 // Bob offers to buy 2000 USD for 2000 EUR; He starts with 2000 EUR
294 // 1. The best quality is the autobridged offers that take 2 EUR
295 // and give 4 USD.
296 // Bob spends 200 EUR and receives 400 USD.
297 // 100 EUR->XRP offers consumed.
298 // 100 XRP->USD offers consumed.
299 // 200 total offers consumed.
300 //
301 // 2. The best quality is the autobridged offers that take 2 EUR
302 // and give 3 USD.
303 // a. One of Carol's offers is taken. This leaves her other
304 // offers unfunded.
305 // b. Carol's remaining 800 offers are consumed as unfunded.
306 // c. 199 of alice's XRP(1) to USD(3) offers are consumed.
307 // A book step is allowed to consume a maxium of 1000 offers
308 // at a given quality, and that limit is now reached.
309 // d. Now the strand is dry, even though there are still funded
310 // XRP(1) to USD(3) offers available.
311 // Bob has spent 400 EUR and received 600 USD in this step.
312 // 200 EUR->XRP offers consumed
313 // 800 unfunded XRP->USD offers consumed
314 // 200 funded XRP->USD offers consumed (1 carol, 199 alice)
315 // 1400 total offers consumed so far (100 left before the
316 // limit)
317 // 3. The best is the non-autobridged offers that takes 500 EUR and
318 // gives 500 USD.
319 // Bob started with 2000 EUR
320 // Bob spent 500 EUR (100+400)
321 // Bob has 1500 EUR left
322 // In this step:
323 // Bob spents 500 EUR and receives 500 USD.
324 // In total:
325 // Bob spent 1100 EUR (200 + 400 + 500)
326 // Bob has 900 EUR remaining (2000 - 1100)
327 // Bob received 1500 USD (400 + 600 + 500)
328 // Alice spent 1497 USD (100*4 + 199*3 + 500)
329 // Alice has 2503 remaining (4000 - 1497)
330 // Alice received 1100 EUR (200 + 400 + 500)
331 env.trust(EUR(10000), bob);
332 env.close();
333 env(pay(gw, bob, EUR(2000)));
334 env.close();
335 env(offer(bob, USD(4000), EUR(4000)));
336 env.close();
337
338 env.require(balance(bob, USD(1500)));
339 env.require(balance(bob, EUR(900)));
340 env.require(offers(bob, 1));
341 env.require(owners(bob, 3));
342
343 env.require(balance(alice, USD(2503)));
344 env.require(balance(alice, EUR(1100)));
345 auto const numAOffers =
346 2000 + 100 + 1000 + 1 - (2 * 100 + 2 * 199 + 1 + 1);
347 env.require(offers(alice, numAOffers));
348 env.require(owners(alice, numAOffers + 2));
349
350 env.require(offers(carol, 0));
351 }
352 {
353 Env env(*this, features);
354
355 env.fund(XRP(100000000), gw, alice, bob, carol);
356
357 env.trust(USD(4000), alice);
358 env(pay(gw, alice, USD(4000)));
359 env.trust(USD(1000), carol);
360 env(pay(gw, carol, USD(3)));
361
362 // Notice the strand with the 800 unfunded offers does not have the
363 // initial best quality
364 n_offers(env, 1, alice, EUR(1), USD(10));
365 n_offers(env, 2000, alice, EUR(2), XRP(1));
366 n_offers(env, 100, alice, XRP(1), USD(4));
367 n_offers(
368 env, 801, carol, XRP(1), USD(3)); // only one offer is funded
369 n_offers(env, 1000, alice, XRP(1), USD(3));
370
371 n_offers(env, 1, alice, EUR(499), USD(499));
372
373 // Bob offers to buy 2000 USD for 2000 EUR; He starts with 2000 EUR
374 // 1. The best quality is the offer that takes 1 EUR and gives 10
375 // USD
376 // Bob spends 1 EUR and receives 10 USD.
377 //
378 // 2. The best quality is the autobridged offers that takes 2 EUR
379 // and gives 4 USD.
380 // Bob spends 200 EUR and receives 400 USD.
381 //
382 // 3. The best quality is the autobridged offers that takes 2 EUR
383 // and gives 3 USD.
384 // a. One of Carol's offers is taken. This leaves her other
385 // offers unfunded.
386 // b. Carol's remaining 800 offers are consumed as unfunded.
387 // c. 199 of alice's XRP(1) to USD(3) offers are consumed.
388 // A book step is allowed to consume a maxium of 1000 offers
389 // at a given quality, and that limit is now reached.
390 // d. Now the strand is dry, even though there are still funded
391 // XRP(1) to USD(3) offers available. Bob has spent 400 EUR and
392 // received 600 USD in this step. (200 funded offers consumed
393 // 800 unfunded offers)
394 // 4. The best is the non-autobridged offers that takes 499 EUR and
395 // gives 499 USD.
396 // Bob has 2000 EUR, and has spent 1+200+400=601 EUR. He has
397 // 1399 left. Bob spent 499 EUR and receives 499 USD.
398 // In total: Bob spent EUR(1 + 200 + 400 + 499) = EUR(1100). He
399 // started with 2000 so has 900 remaining
400 // Bob received USD(10 + 400 + 600 + 499) = USD(1509).
401 // Alice spent 10 + 100*4 + 199*3 + 499 = 1506 USD. She
402 // started with 4000 so has 2494 USD remaining. Alice
403 // received 200 + 400 + 500 = 1100 EUR
404 env.trust(EUR(10000), bob);
405 env.close();
406 env(pay(gw, bob, EUR(2000)));
407 env.close();
408 env(offer(bob, USD(4000), EUR(4000)));
409 env.close();
410
411 env.require(balance(bob, USD(1509)));
412 env.require(balance(bob, EUR(900)));
413 env.require(offers(bob, 1));
414 env.require(owners(bob, 3));
415
416 env.require(balance(alice, USD(2494)));
417 env.require(balance(alice, EUR(1100)));
418 auto const numAOffers =
419 1 + 2000 + 100 + 1000 + 1 - (1 + 2 * 100 + 2 * 199 + 1 + 1);
420 env.require(offers(alice, numAOffers));
421 env.require(owners(alice, numAOffers + 2));
422
423 env.require(offers(carol, 0));
424 }
425 }
426
427 void
428 testOfferOverflow(FeatureBitset features)
429 {
430 testcase("Offer Overflow");
431
432 using namespace jtx;
433
434 auto const gw = Account("gateway");
435 auto const alice = Account("alice");
436 auto const bob = Account("bob");
437
438 auto const USD = gw["USD"];
439
440 Env env(*this, features);
441
442 env.fund(XRP(100000000), gw, alice, bob);
443
444 env.trust(USD(8000), alice);
445 env.trust(USD(8000), bob);
446 env.close();
447
448 env(pay(gw, alice, USD(8000)));
449 env.close();
450
451 // The new flow cross handles consuming excessive offers differently
452 // than the old offer crossing code. In the old code, the total number
453 // of consumed offers is tracked, and the crossings will stop after this
454 // limit is hit. In the new code, the number of offers is tracked per
455 // offerbook and per quality. This test shows how they can differ. Set
456 // up a book with many offers. At each quality keep the number of offers
457 // below the limit. However, if all the offers are consumed it would
458 // create a tecOVERSIZE error.
459
460 // The featureFlowSortStrands introduces a way of tracking the total
461 // number of consumed offers; with this feature the transaction no
462 // longer fails with a tecOVERSIZE error.
463 // The implementation allows any single step to consume at most 1000
464 // offers. With the `FlowSortStrands` feature enabled, if the total
465 // number of offers consumed by all the steps combined exceeds 1500, the
466 // payment stops. Since the first set of offers consumes 998 offers, the
467 // second set will consume 998, which is not over the limit and the
468 // payment stops. So 2*998, or 1996 is the expected value when
469 // `FlowSortStrands` is enabled.
470 n_offers(env, 998, alice, XRP(1.00), USD(1));
471 n_offers(env, 998, alice, XRP(0.99), USD(1));
472 n_offers(env, 998, alice, XRP(0.98), USD(1));
473 n_offers(env, 998, alice, XRP(0.97), USD(1));
474 n_offers(env, 998, alice, XRP(0.96), USD(1));
475 n_offers(env, 998, alice, XRP(0.95), USD(1));
476
477 bool const withSortStrands = features[featureFlowSortStrands];
478
479 auto const expectedTER = [&]() -> TER {
480 if (!withSortStrands)
481 return TER{tecOVERSIZE};
482 return tesSUCCESS;
483 }();
484
485 env(offer(bob, USD(8000), XRP(8000)), ter(expectedTER));
486 env.close();
487
488 auto const expectedUSD = [&] {
489 if (!withSortStrands)
490 return USD(0);
491 return USD(1996);
492 }();
493
494 env.require(balance(bob, expectedUSD));
495 }
496
497 void
498 run() override
499 {
500 auto testAll = [this](FeatureBitset features) {
501 testStepLimit(features);
502 testCrossingLimit(features);
503 testStepAndCrossingLimit(features);
504 testAutoBridgedLimits(features);
505 testOfferOverflow(features);
506 };
507 using namespace jtx;
508 auto const sa = testable_amendments();
509 testAll(sa);
510 testAll(sa - featureFlowSortStrands);
511 testAll(sa - featurePermissionedDEX);
512 testAll(sa - featureFlowSortStrands - featurePermissionedDEX);
513 }
514};
515
516BEAST_DEFINE_TESTSUITE_MANUAL_PRIO(CrossingLimits, app, ripple, 10);
517
518} // namespace test
519} // namespace ripple
beast::unit_test::suite
A testsuite class.
Definition suite.h:52
beast::unit_test::suite::testcase
testcase_t testcase
Memberspace for declaring test cases.
Definition suite.h:152
ripple::test::CrossingLimits_test
Definition CrossingLimits_test.cpp:10
ripple::test::CrossingLimits_test::testStepAndCrossingLimit
void testStepAndCrossingLimit(FeatureBitset features)
Definition CrossingLimits_test.cpp:91
ripple::test::CrossingLimits_test::testAutoBridgedLimitsTaker
void testAutoBridgedLimitsTaker(FeatureBitset features)
Definition CrossingLimits_test.cpp:147
ripple::test::CrossingLimits_test::testAutoBridgedLimits
void testAutoBridgedLimits(FeatureBitset features)
Definition CrossingLimits_test.cpp:243
ripple::test::CrossingLimits_test::testStepLimit
void testStepLimit(FeatureBitset features)
Definition CrossingLimits_test.cpp:13
ripple::test::CrossingLimits_test::testCrossingLimit
void testCrossingLimit(FeatureBitset features)
Definition CrossingLimits_test.cpp:53
ripple::test::CrossingLimits_test::run
void run() override
Runs the suite.
Definition CrossingLimits_test.cpp:498
ripple::test::CrossingLimits_test::testOfferOverflow
void testOfferOverflow(FeatureBitset features)
Definition CrossingLimits_test.cpp:428
ripple::test::jtx::Account
Immutable cryptographic account descriptor.
Definition Account.h:20
ripple::test::jtx::Env
A transaction testing environment.
Definition Env.h:102
ripple::test::jtx::Env::require
void require(Args const &... args)
Check a set of requirements.
Definition Env.h:528
ripple::test::jtx::Env::close
bool close(NetClock::time_point closeTime, std::optional< std::chrono::milliseconds > consensusDelay=std::nullopt)
Close and advance the ledger.
Definition Env.cpp:103
ripple::test::jtx::Env::trust
void trust(STAmount const &amount, Account const &account)
Establish trust lines.
Definition Env.cpp:302
ripple::test::jtx::Env::fund
void fund(bool setDefaultRipple, STAmount const &amount, Account const &account)
Definition Env.cpp:271
ripple::test::jtx::balance
A balance matches.
Definition balance.h:20
ripple::test::jtx::owners
Match the number of items in the account's owner directory.
Definition owners.h:54
ripple::test::jtx::ter
Set the expected result code for a JTx The test will fail if the code doesn't match.
Definition ter.h:16
ripple::test::jtx::none
static none_t const none
Definition tags.h:15
ripple::test::jtx::offers
owner_count< ltOFFER > offers
Match the number of offers in the account's owner directory.
Definition owners.h:73
ripple::test::jtx::pay
Json::Value pay(AccountID const &account, AccountID const &to, AnyAmount amount)
Create a payment.
Definition pay.cpp:11
ripple::test::jtx::n_offers
void n_offers(Env &env, std::size_t n, Account const &account, STAmount const &in, STAmount const &out)
Definition TestHelpers.cpp:320
ripple::test::jtx::testable_amendments
FeatureBitset testable_amendments()
Definition Env.h:55
ripple::test::jtx::offer
Json::Value offer(Account const &account, STAmount const &takerPays, STAmount const &takerGets, std::uint32_t flags)
Create an offer.
Definition offer.cpp:10
ripple::test::jtx::XRP
XRP_t const XRP
Converts to XRP Issue or STAmount.
Definition amount.cpp:92
ripple
Use hash_* containers for keys that do not need a cryptographically secure hashing algorithm.
Definition algorithm.h:6
ripple::tecOVERSIZE
@ tecOVERSIZE
Definition TER.h:293
ripple::tesSUCCESS
@ tesSUCCESS
Definition TER.h:226
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