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fix: provisional PreviousTxn{Id,LedgerSeq} double threading (#515)

Browse Source 
---------

Co-authored-by: tequ <git@tequ.dev>
This commit is contained in:
Niq Dudfield
2025-07-08 15:04:39 +07:00
committed by GitHub
parent 1233694b6c
commit d593f3bef5
9 changed files with 441 additions and 15 deletions
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1
Builds/CMake/RippledCore.cmake
View File

@@ -751,6 +751,7 @@ if (tests)
src/test/app/Path_test.cpp
src/test/app/PayChan_test.cpp
src/test/app/PayStrand_test.cpp
src/test/app/PreviousTxn_test.cpp
src/test/app/PseudoTx_test.cpp
src/test/app/RCLCensorshipDetector_test.cpp
src/test/app/RCLValidations_test.cpp

23
src/ripple/ledger/detail/ApplyStateTable.h
View File

@@ -25,6 +25,7 @@
#include <ripple/ledger/OpenView.h>
#include <ripple/ledger/RawView.h>
#include <ripple/ledger/ReadView.h>
#include <ripple/protocol/Rules.h>
#include <ripple/protocol/TER.h>
#include <ripple/protocol/TxMeta.h>
#include <memory>
@@ -53,6 +54,18 @@ private:
items_t items_;
XRPAmount dropsDestroyed_{0};
// Track original PreviousTxnID/LgrSeq values to restore after provisional
// metadata. This map is populated during provisional metadata generation
// and consumed during final metadata generation. It is not cleared as
// the ApplyStateTable instance is single-use per transaction.
struct ThreadingState
{
uint256 prevTxnID;
uint32_t prevTxnLgrSeq;
bool hasPrevTxnID;
};
mutable std::map<key_type, ThreadingState> originalThreadingState_;
public:
ApplyStateTable() = default;
ApplyStateTable(ApplyStateTable&&) = default;
@@ -73,7 +86,8 @@ public:
std::optional<STAmount> const& deliver,
std::vector<STObject> const& hookExecution,
std::vector<STObject> const& hookEmission,
beast::Journal j);
beast::Journal j,
bool isProvisional = false);
void
apply(
@@ -138,8 +152,11 @@ public:
}
private:
static void
threadItem(TxMeta& meta, std::shared_ptr<SLE> const& to);
void
threadItem(
TxMeta& meta,
std::shared_ptr<SLE> const& to,
Rules const& rules);
std::shared_ptr<SLE>
getForMod(

88
src/ripple/ledger/impl/ApplyStateTable.cpp
View File

@@ -118,7 +118,8 @@ ApplyStateTable::generateTxMeta(
std::optional<STAmount> const& deliver,
std::vector<STObject> const& hookExecution,
std::vector<STObject> const& hookEmission,
beast::Journal j)
beast::Journal j,
bool isProvisional)
{
TxMeta meta(tx.getTransactionID(), to.seq());
if (deliver)
@@ -196,7 +197,7 @@ ApplyStateTable::generateTxMeta(
if (curNode->isThreadedType()) // thread transaction to node
// item modified
threadItem(meta, curNode);
threadItem(meta, curNode, to.rules());
STObject prevs(sfPreviousFields);
for (auto const& obj : *origNode)
@@ -229,7 +230,7 @@ ApplyStateTable::generateTxMeta(
threadOwners(to, meta, curNode, newMod, j);
if (curNode->isThreadedType()) // always thread to self
threadItem(meta, curNode);
threadItem(meta, curNode, to.rules());
STObject news(sfNewFields);
for (auto const& obj : *curNode)
@@ -254,6 +255,34 @@ ApplyStateTable::generateTxMeta(
}
}
// After provisional metadata generation, restore the original PreviousTxnID
// values to prevent contamination of the "before" state used for final
// metadata comparison. This ensures PreviousTxnID appears correctly in
// ModifiedNode metadata.
if (isProvisional && to.rules().enabled(fixProvisionalDoubleThreading))
{
for (auto const& [key, state] : originalThreadingState_)
{
auto iter = items_.find(key);
if (iter != items_.end())
{
auto sle = iter->second.second;
if (state.hasPrevTxnID)
{
sle->setFieldH256(sfPreviousTxnID, state.prevTxnID);
sle->setFieldU32(sfPreviousTxnLgrSeq, state.prevTxnLgrSeq);
// Restored to original PreviousTxnID
}
else
{
sle->makeFieldAbsent(sfPreviousTxnID);
sle->makeFieldAbsent(sfPreviousTxnLgrSeq);
// Restored to no PreviousTxnID
}
}
}
}
return {meta, newMod};
}
@@ -287,6 +316,8 @@ ApplyStateTable::apply(
// VFALCO For diagnostics do we want to show
// metadata even when the base view is open?
JLOG(j.trace()) << "metadata " << meta.getJson(JsonOptions::none);
// Metadata has been generated
}
to.rawTxInsert(tx.getTransactionID(), sTx, sMeta);
apply(to);
@@ -549,9 +580,51 @@ ApplyStateTable::destroyXRP(XRPAmount const& fee)
//------------------------------------------------------------------------------
// Insert this transaction to the SLE's threading list
//
// This method is called during metadata generation to update the
// PreviousTxnID/PreviousTxnLgrSeq fields on SLEs. However, it's called
// twice for each transaction:
// 1. During provisional metadata generation (for hooks to see)
// 2. During final metadata generation (for the actual ledger)
//
// The fixProvisionalDoubleThreading amendment fixes a bug where the
// provisional threading would contaminate the "original" state used
// for metadata comparison, causing PreviousTxnID to be missing from
// the final metadata.
//
// The fix works by:
// - Saving the original PreviousTxnID state for an SLE the first time it's
// threaded during the provisional pass.
// - Restoring the original state for all affected SLEs in a single batch
// after the entire provisional metadata generation is complete.
//
// This batch-restore is critical because threadItem() can be called on the
// same SLE multiple times within one metadata pass. Restoring immediately
// would be incorrect. This approach ensures the final metadata comparison
// starts from the correct, uncontaminated "before" state.
void
ApplyStateTable::threadItem(TxMeta& meta, std::shared_ptr<SLE> const& sle)
ApplyStateTable::threadItem(
TxMeta& meta,
std::shared_ptr<SLE> const& sle,
const Rules& rules)
{
if (rules.enabled(fixProvisionalDoubleThreading))
{
auto const key = sle->key();
if (originalThreadingState_.find(key) == originalThreadingState_.end())
{
// First time (provisional metadata) - save the original state
ThreadingState state;
state.hasPrevTxnID = sle->isFieldPresent(sfPreviousTxnID);
if (state.hasPrevTxnID)
{
state.prevTxnID = sle->getFieldH256(sfPreviousTxnID);
state.prevTxnLgrSeq = sle->getFieldU32(sfPreviousTxnLgrSeq);
}
originalThreadingState_[key] = state;
}
}
key_type prevTxID;
LedgerIndex prevLgrID;
@@ -567,6 +640,11 @@ ApplyStateTable::threadItem(TxMeta& meta, std::shared_ptr<SLE> const& sle)
assert(node.getFieldIndex(sfPreviousTxnLgrSeq) == -1);
node.setFieldH256(sfPreviousTxnID, prevTxID);
node.setFieldU32(sfPreviousTxnLgrSeq, prevLgrID);
// Added PreviousTxnID to metadata
}
else
{
// PreviousTxnID already present in metadata
}
assert(node.getFieldH256(sfPreviousTxnID) == prevTxID);
@@ -640,7 +718,7 @@ ApplyStateTable::threadTx(
JLOG(j.warn()) << "Threading to non-existent account: " << toBase58(to);
return;
}
threadItem(meta, sle);
threadItem(meta, sle, base.rules());
}
void

9
src/ripple/ledger/impl/ApplyViewImpl.cpp
View File

@@ -41,8 +41,13 @@ ApplyViewImpl::generateProvisionalMeta(
beast::Journal j)
{
auto [meta, _] = items_.generateTxMeta(
to, tx, deliver_, hookExecution_, hookEmission_, j);
to,
tx,
deliver_,
hookExecution_,
hookEmission_,
j,
true); // isProvisional = true
return meta;
}

3
src/ripple/protocol/Feature.h
View File

@@ -74,7 +74,7 @@ namespace detail {
// Feature.cpp. Because it's only used to reserve storage, and determine how
// large to make the FeatureBitset, it MAY be larger. It MUST NOT be less than
// the actual number of amendments. A LogicError on startup will verify this.
static constexpr std::size_t numFeatures = 81;
static constexpr std::size_t numFeatures = 82;
/** Amendments that this server supports and the default voting behavior.
Whether they are enabled depends on the Rules defined in the validated
@@ -369,6 +369,7 @@ extern uint256 const fixXahauV3;
extern uint256 const fix20250131;
extern uint256 const featureHookCanEmit;
extern uint256 const fixRewardClaimFlags;
extern uint256 const fixProvisionalDoubleThreading;
} // namespace ripple

1
src/ripple/protocol/impl/Feature.cpp
View File

@@ -475,6 +475,7 @@ REGISTER_FIX (fixXahauV3, Supported::yes, VoteBehavior::De
REGISTER_FIX (fix20250131, Supported::yes, VoteBehavior::DefaultYes);
REGISTER_FEATURE(HookCanEmit, Supported::yes, VoteBehavior::DefaultNo);
REGISTER_FIX (fixRewardClaimFlags, Supported::yes, VoteBehavior::DefaultYes);
REGISTER_FIX (fixProvisionalDoubleThreading, Supported::yes, VoteBehavior::DefaultYes);
// The following amendments are obsolete, but must remain supported
// because they could potentially get enabled.

317
src/test/app/PreviousTxn_test.cpp Normal file
View File

@@ -0,0 +1,317 @@
//------------------------------------------------------------------------------
/*
This file is part of rippled: https://github.com/ripple/rippled
Copyright (c) 2025 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 <ripple/protocol/jss.h>
#include <test/jtx.h>
namespace ripple {
namespace test {
class PreviousTxnID_test : public beast::unit_test::suite
{
public:
void
testPreviousTxnID(FeatureBitset features)
{
using namespace test::jtx;
Env env{
*this, envconfig(), features, nullptr, beast::severities::kNone};
auto j = env.app().logs().journal("PreviousTxnID_test");
auto const alice = Account{"alice"};
auto const bob = Account{"bob"};
auto const USD = bob["USD"];
env.fund(XRP(10000), alice, bob);
env.close();
// Create a trustline
env(trust(alice, USD(1000)));
env.close();
// Get the transaction metadata and ID
auto const meta1 = env.meta();
auto const trustCreateTxID = env.tx()->getTransactionID();
BEAST_EXPECT(meta1);
// Check if ModifiedNode has PreviousTxnID at root level
auto const& affectedNodes = meta1->getFieldArray(sfAffectedNodes);
bool foundPreviousTxnID = false;
bool foundModifiedRippleState = false;
bool foundCreatedRippleState = false;
for (auto const& node : affectedNodes)
{
if (node.getFieldU16(sfLedgerEntryType) == ltRIPPLE_STATE)
{
if (node.getFName() == sfModifiedNode)
{
BEAST_EXPECT(false);
}
else if (node.getFName() == sfCreatedNode)
{
foundCreatedRippleState = true;
foundPreviousTxnID = node.isFieldPresent(sfPreviousTxnID);
}
}
}
BEAST_EXPECT(foundCreatedRippleState);
// Why we expect NO PreviousTxnID in newly created trustline metadata:
//
// PreviousTxnID in metadata indicates which transaction PREVIOUSLY
// modified an object, not which transaction created it. For a newly
// created object, there is no previous transaction - the current
// transaction is the first one to touch this object.
//
// While the SLE itself will have PreviousTxnID set to the creating
// transaction (by ApplyStateTable::threadItem), the metadata correctly
// omits PreviousTxnID from CreatedNode because there was no previous
// modification to reference.
//
// Technical detail: trustCreate() creates the RippleState with
// PreviousTxnID as a defaultObject placeholder (since it's soeREQUIRED
// in LedgerFormats.cpp). ApplyStateTable::generateTxMeta skips fields
// with zero/empty values when generating metadata, so the unset
// PreviousTxnID doesn't appear in the CreatedNode output.
BEAST_EXPECT(foundPreviousTxnID == false);
BEAST_EXPECT(foundModifiedRippleState == false);
// Now let's check the actual ledger entry to see if PreviousTxnID was
// set Get the trustline from the ledger
auto const trustlineKey = keylet::line(alice, bob, USD.currency);
auto const sleTrustline = env.le(trustlineKey);
BEAST_EXPECT(sleTrustline);
if (sleTrustline)
{
// Check if the SLE itself has PreviousTxnID set
// Even though it didn't appear in metadata, the SLE should have it
// because ApplyStateTable::threadItem() sets it after creation
bool sleHasPrevTxnID =
sleTrustline->isFieldPresent(sfPreviousTxnID);
bool sleHasPrevTxnSeq =
sleTrustline->isFieldPresent(sfPreviousTxnLgrSeq);
JLOG(j.info()) << "SLE has PreviousTxnID: " << sleHasPrevTxnID;
JLOG(j.info()) << "SLE has PreviousTxnLgrSeq: " << sleHasPrevTxnSeq;
if (sleHasPrevTxnID && sleHasPrevTxnSeq)
{
auto const prevTxnID =
sleTrustline->getFieldH256(sfPreviousTxnID);
auto const prevTxnSeq =
sleTrustline->getFieldU32(sfPreviousTxnLgrSeq);
auto const creatingTxnID = env.tx()->getTransactionID();
JLOG(j.info()) << "SLE PreviousTxnID: " << prevTxnID;
JLOG(j.info()) << "Creating TxnID: " << creatingTxnID;
JLOG(j.info()) << "SLE PreviousTxnLgrSeq: " << prevTxnSeq;
// The PreviousTxnID in the SLE should match the transaction
// that created it
BEAST_EXPECT(prevTxnID == creatingTxnID);
BEAST_EXPECT(prevTxnSeq == env.closed()->seq());
}
else
{
// This would indicate that ApplyStateTable::threadItem() didn't
// set PreviousTxnID on the newly created trustline
JLOG(j.warn())
<< "Newly created trustline SLE missing PreviousTxnID!";
BEAST_EXPECT(false);
}
}
// Now modify the trustline with a payment
env(pay(bob, alice, USD(100)));
env.close();
// Get the second transaction metadata
auto const meta2 = env.meta();
BEAST_EXPECT(meta2);
// Check ModifiedNode for PreviousTxnID
auto const& affectedNodes2 = meta2->getFieldArray(sfAffectedNodes);
bool foundPreviousTxnIDInModified = false;
bool foundPreviousTxnIDInPreviousFields = false;
for (auto const& node : affectedNodes2)
{
if (node.getFName() == sfModifiedNode &&
node.getFieldU16(sfLedgerEntryType) == ltRIPPLE_STATE)
{
auto json = node.getJson({});
JLOG(j.trace()) << json;
// Why we expect PreviousTxnID in ModifiedNode metadata:
//
// When a transaction modifies an existing RippleState, the
// ApplyView tracks the modification. During metadata
// generation, ApplyStateTable::generateTxMeta compares the
// before and after states of the SLE.
//
// For ModifiedNode entries, the metadata should include
// PreviousTxnID and PreviousTxnLgrSeq at the root level to
// indicate which transaction last modified this object.
// This is different from PreviousFields, which shows what
// field values changed.
//
// The bug fixed by the `fixProvisionalDoubleThreading`
// amendment was that ApplyStateTable::threadItem() was
// modifying the original SLE during provisional metadata
// generation. This contaminated the "before" state used for
// comparison, so when final metadata was generated, the
// comparison didn't see PreviousTxnID as a change because both
// states had the new value.
bool expectPreviousTxnID =
features[fixProvisionalDoubleThreading];
if (node.isFieldPresent(sfPreviousTxnID))
{
foundPreviousTxnIDInModified = true;
auto prevTxnID = node.getFieldH256(sfPreviousTxnID);
auto prevLgrSeq = node.getFieldU32(sfPreviousTxnLgrSeq);
BEAST_EXPECT(node.isFieldPresent(sfPreviousTxnLgrSeq));
BEAST_EXPECT(prevTxnID != beast::zero);
BEAST_EXPECT(prevLgrSeq > 0);
JLOG(j.info()) << "Found PreviousTxnID: " << prevTxnID
<< " at ledger: " << prevLgrSeq << std::endl;
// When the fix is enabled, we should see the trustline
// creation transaction ID as the previous transaction
if (expectPreviousTxnID)
{
BEAST_EXPECT(prevTxnID == trustCreateTxID);
}
}
else
{
// Without the fix, we expect PreviousTxnID to be missing
// due to the provisional metadata contamination bug
JLOG(j.info()) << "PreviousTxnID missing in metadata";
}
// Check if PreviousTxnID appears in PreviousFields
// (it shouldn't - PreviousTxnID is a root-level field)
if (node.isFieldPresent(sfPreviousFields))
{
auto prevFields = dynamic_cast<STObject const*>(
node.peekAtPField(sfPreviousFields));
if (prevFields &&
prevFields->isFieldPresent(sfPreviousTxnID))
{
foundPreviousTxnIDInPreviousFields = true;
JLOG(j.warn()) << "Found PreviousTxnID in "
"PreviousFields (unexpected)";
}
}
}
}
// PreviousTxnID should never appear in PreviousFields
BEAST_EXPECT(!foundPreviousTxnIDInPreviousFields);
// With the fix enabled, we expect to find PreviousTxnID
// Without the fix, we expect it to be missing (the bug)
if (features[fixProvisionalDoubleThreading])
{
BEAST_EXPECT(foundPreviousTxnIDInModified);
}
else
{
BEAST_EXPECT(!foundPreviousTxnIDInModified);
}
// Additional check: Verify the SLE state after the payment
auto const sleTrustlineAfter = env.le(trustlineKey);
BEAST_EXPECT(sleTrustlineAfter);
if (sleTrustlineAfter)
{
// The SLE should always have PreviousTxnID set after modification
BEAST_EXPECT(sleTrustlineAfter->isFieldPresent(sfPreviousTxnID));
BEAST_EXPECT(
sleTrustlineAfter->isFieldPresent(sfPreviousTxnLgrSeq));
auto const currentPrevTxnID =
sleTrustlineAfter->getFieldH256(sfPreviousTxnID);
auto const currentPrevTxnSeq =
sleTrustlineAfter->getFieldU32(sfPreviousTxnLgrSeq);
// The PreviousTxnID should now point to the payment transaction
auto const paymentTxID = env.tx()->getTransactionID();
BEAST_EXPECT(currentPrevTxnID == paymentTxID);
BEAST_EXPECT(currentPrevTxnSeq == env.closed()->seq());
// When the bug is present (feature disabled), the metadata won't
// show the change, but the SLE will still be updated correctly
if (!features[fixProvisionalDoubleThreading])
{
JLOG(j.info())
<< "Bug confirmed: SLE has correct PreviousTxnID ("
<< currentPrevTxnID
<< ") but metadata doesn't show the change";
}
}
// Check account objects were threaded correctly
auto const aliceAccount = env.le(keylet::account(alice));
auto const bobAccount = env.le(keylet::account(bob));
BEAST_EXPECT(aliceAccount);
BEAST_EXPECT(bobAccount);
if (aliceAccount && bobAccount)
{
// Both accounts should have been threaded by the payment
BEAST_EXPECT(aliceAccount->isFieldPresent(sfPreviousTxnID));
BEAST_EXPECT(bobAccount->isFieldPresent(sfPreviousTxnID));
auto const alicePrevTxnID =
aliceAccount->getFieldH256(sfPreviousTxnID);
auto const bobPrevTxnID = bobAccount->getFieldH256(sfPreviousTxnID);
auto const paymentTxID = env.tx()->getTransactionID();
// Both should point to the payment transaction
BEAST_EXPECT(alicePrevTxnID == paymentTxID);
BEAST_EXPECT(bobPrevTxnID == paymentTxID);
}
}
void
run() override
{
using namespace test::jtx;
auto const sa = supported_amendments();
testcase("With fixProvisionalDoubleThreading enabled");
testPreviousTxnID(sa);
testcase("Without fixProvisionalDoubleThreading (bug present)");
testPreviousTxnID(sa - fixProvisionalDoubleThreading);
}
};
BEAST_DEFINE_TESTSUITE(PreviousTxnID, app, ripple);
} // namespace test
} // namespace ripple

11
src/test/app/TxQ_test.cpp
View File

@@ -186,7 +186,8 @@ class TxQ1_test : public beast::unit_test::suite
// In order for the vote to occur, we must run as a validator
p->section("validation_seed")
.legacy("shUwVw52ofnCUX5m7kPTKzJdr4HEH");
.legacy("shUwVw52ofnCUX5m7kPTKzJdr4HEH"); // not-suspicious
// test seed
}
return p;
}
@@ -5049,7 +5050,9 @@ public:
testFailInPreclaim(all);
testQueuedTxFails(all);
testMultiTxnPerAccount(all);
testTieBreaking(all);
// fragile: hardcoded ordering by txID XOR parentHash
// parentHash < txTree Hash < txMeta < PreviousTxnID
testTieBreaking(all - fixProvisionalDoubleThreading);
testAcctTxnID(all);
testMaximum(all);
testUnexpectedBalanceChange(all);
@@ -5067,7 +5070,9 @@ public:
testAcctInQueueButEmpty(all);
testRPC(all);
testExpirationReplacement(all);
testFullQueueGapFill(all);
// fragile: hardcoded ordering by txID XOR parentHash
// parentHash < txTree Hash < txMeta < PreviousTxnID
testFullQueueGapFill(all - fixProvisionalDoubleThreading);
testSignAndSubmitSequence(all);
testAccountInfo(all);
testServerInfo(all);

3
src/test/rpc/LedgerRPC_test.cpp
View File

@@ -2088,7 +2088,8 @@ public:
section.set("normal_consensus_increase_percent", "0");
return cfg;
}),
supported_amendments() - featureXahauGenesis};
supported_amendments() - featureXahauGenesis -
fixProvisionalDoubleThreading};
Json::Value jv;
jv[jss::ledger_index] = "current";