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Init (#614)

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Fixes #617
This commit is contained in:
cyan317
2023-05-02 13:24:23 +01:00
committed by GitHub
parent 4b2d53fc2f
commit 7776a5ffb6
6 changed files with 601 additions and 0 deletions
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2
CMakeLists.txt
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@@ -91,6 +91,7 @@ target_sources(clio PRIVATE
src/rpc/ngHandlers/LedgerData.cpp
src/rpc/ngHandlers/AccountNFTs.cpp
src/rpc/ngHandlers/AccountObjects.cpp
src/rpc/ngHandlers/BookChanges.cpp
## RPC Methods
# Account
src/rpc/handlers/AccountChannels.cpp
@@ -177,6 +178,7 @@ if(BUILD_TESTS)
unittests/rpc/handlers/UnsubscribeTest.cpp
unittests/rpc/handlers/LedgerDataTest.cpp
unittests/rpc/handlers/AccountObjectsTest.cpp
unittests/rpc/handlers/BookChangesTest.cpp
# Backend
unittests/backend/cassandra/BaseTests.cpp
unittests/backend/cassandra/BackendTests.cpp

232
src/rpc/BookChangesHelper.h Normal file
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@@ -0,0 +1,232 @@
//------------------------------------------------------------------------------
/*
This file is part of clio: https://github.com/XRPLF/clio
Copyright (c) 2023, the clio developers.
Permission to use, copy, modify, and 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.
*/
//==============================================================================
#pragma once
#include <rpc/RPCHelpers.h>
#include <set>
namespace RPCng {
/**
* @brief Represents an entry in the book_changes' changes array.
*/
struct BookChange
{
ripple::STAmount sideAVolume;
ripple::STAmount sideBVolume;
ripple::STAmount highRate;
ripple::STAmount lowRate;
ripple::STAmount openRate;
ripple::STAmount closeRate;
};
/**
* @brief Encapsulates the book_changes computations and transformations.
*/
class BookChanges final
{
public:
BookChanges() = delete; // only accessed via static handle function
/**
* @brief Computes all book_changes for the given transactions.
*
* @param transactions The transactions to compute book changes for
* @return std::vector<BookChange> Book changes
*/
[[nodiscard]] static std::vector<BookChange>
compute(std::vector<Backend::TransactionAndMetadata> const& transactions)
{
return HandlerImpl{}(transactions);
}
private:
class HandlerImpl final
{
std::map<std::string, BookChange> tally_ = {};
std::optional<uint32_t> offerCancel_ = {};
public:
[[nodiscard]] std::vector<BookChange>
operator()(std::vector<Backend::TransactionAndMetadata> const& transactions)
{
for (auto const& tx : transactions)
handleBookChange(tx);
// TODO: rewrite this with std::ranges when compilers catch up
std::vector<BookChange> changes;
std::transform(
std::make_move_iterator(std::begin(tally_)),
std::make_move_iterator(std::end(tally_)),
std::back_inserter(changes),
[](auto obj) { return obj.second; });
return changes;
}
private:
void
handleAffectedNode(ripple::STObject const& node)
{
auto const& metaType = node.getFName();
auto const nodeType = node.getFieldU16(ripple::sfLedgerEntryType);
// we only care about ripple::ltOFFER objects being modified or
// deleted
if (nodeType != ripple::ltOFFER || metaType == ripple::sfCreatedNode)
return;
// if either FF or PF are missing we can't compute
// but generally these are cancelled rather than crossed
// so skipping them is consistent
if (!node.isFieldPresent(ripple::sfFinalFields) || !node.isFieldPresent(ripple::sfPreviousFields))
return;
auto const& finalFields = node.peekAtField(ripple::sfFinalFields).downcast<ripple::STObject>();
auto const& previousFields = node.peekAtField(ripple::sfPreviousFields).downcast<ripple::STObject>();
// defensive case that should never be hit
if (!finalFields.isFieldPresent(ripple::sfTakerGets) || !finalFields.isFieldPresent(ripple::sfTakerPays) ||
!previousFields.isFieldPresent(ripple::sfTakerGets) ||
!previousFields.isFieldPresent(ripple::sfTakerPays))
return;
// filter out any offers deleted by explicit offer cancels
if (metaType == ripple::sfDeletedNode && offerCancel_ &&
finalFields.getFieldU32(ripple::sfSequence) == *offerCancel_)
return;
// compute the difference in gets and pays actually
// affected onto the offer
auto const deltaGets =
finalFields.getFieldAmount(ripple::sfTakerGets) - previousFields.getFieldAmount(ripple::sfTakerGets);
auto const deltaPays =
finalFields.getFieldAmount(ripple::sfTakerPays) - previousFields.getFieldAmount(ripple::sfTakerPays);
transformAndStore(deltaGets, deltaPays);
}
void
transformAndStore(ripple::STAmount const& deltaGets, ripple::STAmount const& deltaPays)
{
auto const g = to_string(deltaGets.issue());
auto const p = to_string(deltaPays.issue());
auto const noswap = isXRP(deltaGets) ? true : (isXRP(deltaPays) ? false : (g < p));
auto first = noswap ? deltaGets : deltaPays;
auto second = noswap ? deltaPays : deltaGets;
// defensively programmed, should (probably) never happen
if (second == beast::zero)
return;
auto const rate = divide(first, second, ripple::noIssue());
if (first < beast::zero)
first = -first;
if (second < beast::zero)
second = -second;
auto const key = noswap ? (g + '|' + p) : (p + '|' + g);
if (tally_.contains(key))
{
auto& entry = tally_.at(key);
entry.sideAVolume += first;
entry.sideBVolume += second;
if (entry.highRate < rate)
entry.highRate = rate;
if (entry.lowRate > rate)
entry.lowRate = rate;
entry.closeRate = rate;
}
else
{
// TODO: use paranthesized initialization when clang catches up
tally_[key] = {
first, // sideAVolume
second, // sideBVolume
rate, // highRate
rate, // lowRate
rate, // openRate
rate, // closeRate
};
}
}
void
handleBookChange(Backend::TransactionAndMetadata const& blob)
{
auto const [tx, meta] = RPC::deserializeTxPlusMeta(blob);
if (!tx || !meta || !tx->isFieldPresent(ripple::sfTransactionType))
return;
offerCancel_ = shouldCancelOffer(tx);
for (auto const& node : meta->getFieldArray(ripple::sfAffectedNodes))
handleAffectedNode(node);
}
std::optional<uint32_t>
shouldCancelOffer(std::shared_ptr<ripple::STTx const> const& tx) const
{
switch (tx->getFieldU16(ripple::sfTransactionType))
{
// in future if any other ways emerge to cancel an offer
// this switch makes them easy to add
case ripple::ttOFFER_CANCEL:
case ripple::ttOFFER_CREATE:
if (tx->isFieldPresent(ripple::sfOfferSequence))
return tx->getFieldU32(ripple::sfOfferSequence);
default:
return std::nullopt;
}
}
};
};
inline void
tag_invoke(boost::json::value_from_tag, boost::json::value& jv, BookChange const& change)
{
auto amountStr = [](ripple::STAmount const& amount) -> std::string {
return isXRP(amount) ? to_string(amount.xrp()) : to_string(amount.iou());
};
auto currencyStr = [](ripple::STAmount const& amount) -> std::string {
return isXRP(amount) ? "XRP_drops" : to_string(amount.issue());
};
jv = {
{JS(currency_a), currencyStr(change.sideAVolume)},
{JS(currency_b), currencyStr(change.sideBVolume)},
{JS(volume_a), amountStr(change.sideAVolume)},
{JS(volume_b), amountStr(change.sideBVolume)},
{JS(high), to_string(change.highRate.iou())},
{JS(low), to_string(change.lowRate.iou())},
{JS(open), to_string(change.openRate.iou())},
{JS(close), to_string(change.closeRate.iou())},
};
}
} // namespace RPCng

76
src/rpc/ngHandlers/BookChanges.cpp Normal file
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@@ -0,0 +1,76 @@
//------------------------------------------------------------------------------
/*
This file is part of clio: https://github.com/XRPLF/clio
Copyright (c) 2023, the clio developers.
Permission to use, copy, modify, and 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 <rpc/ngHandlers/BookChanges.h>
namespace RPCng {
BookChangesHandler::Result
BookChangesHandler::process(BookChangesHandler::Input input, Context const& ctx) const
{
auto const range = sharedPtrBackend_->fetchLedgerRange();
auto const lgrInfoOrStatus = RPC::getLedgerInfoFromHashOrSeq(
*sharedPtrBackend_, ctx.yield, input.ledgerHash, input.ledgerIndex, range->maxSequence);
if (auto const status = std::get_if<RPC::Status>(&lgrInfoOrStatus))
return Error{*status};
auto const lgrInfo = std::get<ripple::LedgerInfo>(lgrInfoOrStatus);
auto const transactions = sharedPtrBackend_->fetchAllTransactionsInLedger(lgrInfo.seq, ctx.yield);
Output response;
response.bookChanges = BookChanges::compute(transactions);
response.ledgerHash = ripple::strHex(lgrInfo.hash);
response.ledgerIndex = lgrInfo.seq;
response.ledgerTime = lgrInfo.closeTime.time_since_epoch().count();
return response;
}
void
tag_invoke(boost::json::value_from_tag, boost::json::value& jv, BookChangesHandler::Output const& output)
{
jv = {
{JS(type), "bookChanges"},
{JS(ledger_hash), output.ledgerHash},
{JS(ledger_index), output.ledgerIndex},
{JS(ledger_time), output.ledgerTime},
{JS(validated), output.validated},
{JS(changes), boost::json::value_from(output.bookChanges)}};
}
BookChangesHandler::Input
tag_invoke(boost::json::value_to_tag<BookChangesHandler::Input>, boost::json::value const& jv)
{
auto const& jsonObject = jv.as_object();
BookChangesHandler::Input input;
if (jsonObject.contains(JS(ledger_hash)))
input.ledgerHash = jv.at(JS(ledger_hash)).as_string().c_str();
if (jsonObject.contains(JS(ledger_index)))
{
if (!jsonObject.at(JS(ledger_index)).is_string())
input.ledgerIndex = jv.at(JS(ledger_index)).as_int64();
else if (jsonObject.at(JS(ledger_index)).as_string() != "validated")
input.ledgerIndex = std::stoi(jv.at(JS(ledger_index)).as_string().c_str());
}
return input;
}
} // namespace RPCng

77
src/rpc/ngHandlers/BookChanges.h Normal file
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@@ -0,0 +1,77 @@
//------------------------------------------------------------------------------
/*
This file is part of clio: https://github.com/XRPLF/clio
Copyright (c) 2023, the clio developers.
Permission to use, copy, modify, and 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.
*/
//==============================================================================
#pragma once
#include <backend/BackendInterface.h>
#include <rpc/BookChangesHelper.h>
#include <rpc/RPCHelpers.h>
#include <rpc/common/Types.h>
#include <rpc/common/Validators.h>
namespace RPCng {
class BookChangesHandler
{
std::shared_ptr<BackendInterface> sharedPtrBackend_;
public:
struct Output
{
std::string ledgerHash;
uint32_t ledgerIndex;
uint32_t ledgerTime;
std::vector<BookChange> bookChanges;
bool validated = true;
};
// Clio does not implement deletion_blockers_only
struct Input
{
std::optional<std::string> ledgerHash;
std::optional<uint32_t> ledgerIndex;
};
using Result = RPCng::HandlerReturnType<Output>;
BookChangesHandler(std::shared_ptr<BackendInterface> const& sharedPtrBackend) : sharedPtrBackend_(sharedPtrBackend)
{
}
RpcSpecConstRef
spec() const
{
static auto const rpcSpec = RpcSpec{
{JS(ledger_hash), validation::Uint256HexStringValidator},
{JS(ledger_index), validation::LedgerIndexValidator},
};
return rpcSpec;
}
Result
process(Input input, Context const& ctx) const;
private:
friend void
tag_invoke(boost::json::value_from_tag, boost::json::value& jv, Output const& output);
friend Input
tag_invoke(boost::json::value_to_tag<Input>, boost::json::value const& jv);
};
} // namespace RPCng

1
src/subscriptions/SubscriptionManager.cpp
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@@ -247,6 +247,7 @@ SubscriptionManager::pubBookChanges(
ripple::LedgerInfo const& lgrInfo,
std::vector<Backend::TransactionAndMetadata> const& transactions)
{
// TODO: change to ngRPC after old RPC is removed
auto const json = RPC::computeBookChanges(lgrInfo, transactions);
auto const bookChangesMsg = std::make_shared<Message>(boost::json::serialize(json));
bookChangesSubscribers_.publish(bookChangesMsg);

213
unittests/rpc/handlers/BookChangesTest.cpp Normal file
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@@ -0,0 +1,213 @@
//------------------------------------------------------------------------------
/*
This file is part of clio: https://github.com/XRPLF/clio
Copyright (c) 2023, the clio developers.
Permission to use, copy, modify, and 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 <rpc/common/AnyHandler.h>
#include <rpc/ngHandlers/BookChanges.h>
#include <util/Fixtures.h>
#include <util/TestObject.h>
#include <fmt/core.h>
using namespace RPCng;
namespace json = boost::json;
using namespace testing;
constexpr static auto CURRENCY = "0158415500000000C1F76FF6ECB0BAC600000000";
constexpr static auto ISSUER = "rK9DrarGKnVEo2nYp5MfVRXRYf5yRX3mwD";
constexpr static auto ACCOUNT1 = "rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn";
constexpr static auto ACCOUNT2 = "rLEsXccBGNR3UPuPu2hUXPjziKC3qKSBun";
constexpr static auto LEDGERHASH = "4BC50C9B0D8515D3EAAE1E74B29A95804346C491EE1A95BF25E4AAB854A6A652";
constexpr static auto MAXSEQ = 30;
constexpr static auto MINSEQ = 10;
class RPCBookChangesHandlerTest : public HandlerBaseTest
{
};
struct BookChangesParamTestCaseBundle
{
std::string testName;
std::string testJson;
std::string expectedError;
std::string expectedErrorMessage;
};
// parameterized test cases for parameters check
struct BookChangesParameterTest : public RPCBookChangesHandlerTest,
public WithParamInterface<BookChangesParamTestCaseBundle>
{
struct NameGenerator
{
template <class ParamType>
std::string
operator()(const testing::TestParamInfo<ParamType>& info) const
{
auto bundle = static_cast<BookChangesParamTestCaseBundle>(info.param);
return bundle.testName;
}
};
};
static auto
generateTestValuesForParametersTest()
{
return std::vector<BookChangesParamTestCaseBundle>{
BookChangesParamTestCaseBundle{
"LedgerHashInvalid", R"({"ledger_hash":"1"})", "invalidParams", "ledger_hashMalformed"},
BookChangesParamTestCaseBundle{
"LedgerHashNotString", R"({"ledger_hash":1})", "invalidParams", "ledger_hashNotString"},
BookChangesParamTestCaseBundle{
"LedgerIndexInvalid", R"({"ledger_index":"a"})", "invalidParams", "ledgerIndexMalformed"},
};
}
INSTANTIATE_TEST_CASE_P(
RPCBookChangesGroup1,
BookChangesParameterTest,
ValuesIn(generateTestValuesForParametersTest()),
BookChangesParameterTest::NameGenerator{});
TEST_P(BookChangesParameterTest, InvalidParams)
{
auto const testBundle = GetParam();
runSpawn([&, this](auto& yield) {
auto const handler = AnyHandler{BookChangesHandler{mockBackendPtr}};
auto const req = json::parse(testBundle.testJson);
auto const output = handler.process(req, Context{std::ref(yield)});
ASSERT_FALSE(output);
auto const err = RPC::makeError(output.error());
EXPECT_EQ(err.at("error").as_string(), testBundle.expectedError);
EXPECT_EQ(err.at("error_message").as_string(), testBundle.expectedErrorMessage);
});
}
TEST_F(RPCBookChangesHandlerTest, LedgerNonExistViaIntSequence)
{
auto const rawBackendPtr = static_cast<MockBackend*>(mockBackendPtr.get());
mockBackendPtr->updateRange(MINSEQ); // min
mockBackendPtr->updateRange(MAXSEQ); // max
EXPECT_CALL(*rawBackendPtr, fetchLedgerBySequence).Times(1);
// return empty ledgerinfo
ON_CALL(*rawBackendPtr, fetchLedgerBySequence(MAXSEQ, _))
.WillByDefault(Return(std::optional<ripple::LedgerInfo>{}));
auto const static input = boost::json::parse(R"({"ledger_index":30})");
auto const handler = AnyHandler{BookChangesHandler{mockBackendPtr}};
runSpawn([&](auto& yield) {
auto const output = handler.process(input, Context{std::ref(yield)});
ASSERT_FALSE(output);
auto const err = RPC::makeError(output.error());
EXPECT_EQ(err.at("error").as_string(), "lgrNotFound");
EXPECT_EQ(err.at("error_message").as_string(), "ledgerNotFound");
});
}
TEST_F(RPCBookChangesHandlerTest, LedgerNonExistViaStringSequence)
{
auto const rawBackendPtr = static_cast<MockBackend*>(mockBackendPtr.get());
mockBackendPtr->updateRange(MINSEQ); // min
mockBackendPtr->updateRange(MAXSEQ); // max
EXPECT_CALL(*rawBackendPtr, fetchLedgerBySequence).Times(1);
// return empty ledgerinfo
ON_CALL(*rawBackendPtr, fetchLedgerBySequence(MAXSEQ, _)).WillByDefault(Return(std::nullopt));
auto const static input = boost::json::parse(R"({"ledger_index":"30"})");
auto const handler = AnyHandler{BookChangesHandler{mockBackendPtr}};
runSpawn([&](auto& yield) {
auto const output = handler.process(input, Context{std::ref(yield)});
ASSERT_FALSE(output);
auto const err = RPC::makeError(output.error());
EXPECT_EQ(err.at("error").as_string(), "lgrNotFound");
EXPECT_EQ(err.at("error_message").as_string(), "ledgerNotFound");
});
}
TEST_F(RPCBookChangesHandlerTest, LedgerNonExistViaHash)
{
auto const rawBackendPtr = static_cast<MockBackend*>(mockBackendPtr.get());
mockBackendPtr->updateRange(MINSEQ); // min
mockBackendPtr->updateRange(MAXSEQ); // max
EXPECT_CALL(*rawBackendPtr, fetchLedgerByHash).Times(1);
// return empty ledgerinfo
ON_CALL(*rawBackendPtr, fetchLedgerByHash(ripple::uint256{LEDGERHASH}, _))
.WillByDefault(Return(std::optional<ripple::LedgerInfo>{}));
auto const static input = boost::json::parse(fmt::format(
R"({{
"ledger_hash":"{}"
}})",
LEDGERHASH));
auto const handler = AnyHandler{BookChangesHandler{mockBackendPtr}};
runSpawn([&](auto& yield) {
auto const output = handler.process(input, Context{std::ref(yield)});
ASSERT_FALSE(output);
auto const err = RPC::makeError(output.error());
EXPECT_EQ(err.at("error").as_string(), "lgrNotFound");
EXPECT_EQ(err.at("error_message").as_string(), "ledgerNotFound");
});
}
TEST_F(RPCBookChangesHandlerTest, NormalPath)
{
static auto constexpr expectedOut =
R"({
"type":"bookChanges",
"ledger_hash":"4BC50C9B0D8515D3EAAE1E74B29A95804346C491EE1A95BF25E4AAB854A6A652",
"ledger_index":30,
"ledger_time":0,
"validated":true,
"changes":[
{
"currency_a":"XRP_drops",
"currency_b":"rK9DrarGKnVEo2nYp5MfVRXRYf5yRX3mwD/0158415500000000C1F76FF6ECB0BAC600000000",
"volume_a":"2",
"volume_b":"2",
"high":"-1",
"low":"-1",
"open":"-1",
"close":"-1"
}
]
})";
auto const rawBackendPtr = static_cast<MockBackend*>(mockBackendPtr.get());
mockBackendPtr->updateRange(MINSEQ); // min
mockBackendPtr->updateRange(MAXSEQ); // max
EXPECT_CALL(*rawBackendPtr, fetchLedgerBySequence).Times(1);
ON_CALL(*rawBackendPtr, fetchLedgerBySequence(MAXSEQ, _))
.WillByDefault(Return(CreateLedgerInfo(LEDGERHASH, MAXSEQ)));
auto transactions = std::vector<TransactionAndMetadata>{};
auto trans1 = TransactionAndMetadata();
ripple::STObject obj = CreatePaymentTransactionObject(ACCOUNT1, ACCOUNT2, 1, 1, 32);
trans1.transaction = obj.getSerializer().peekData();
trans1.ledgerSequence = 32;
ripple::STObject metaObj = CreateMetaDataForBookChange(CURRENCY, ISSUER, 22, 1, 3, 3, 1);
trans1.metadata = metaObj.getSerializer().peekData();
transactions.push_back(trans1);
EXPECT_CALL(*rawBackendPtr, fetchAllTransactionsInLedger).Times(1);
ON_CALL(*rawBackendPtr, fetchAllTransactionsInLedger(MAXSEQ, _)).WillByDefault(Return(transactions));
auto const handler = AnyHandler{BookChangesHandler{mockBackendPtr}};
runSpawn([&](auto& yield) {
auto const output = handler.process(json::parse("{}"), Context{std::ref(yield)});
ASSERT_TRUE(output);
EXPECT_EQ(*output, json::parse(expectedOut));
});
}