XRPFees: Fee setting and handling improvements (XRPLF#4247)

* Introduces amendment `XRPFees` * Convert fee voting and protocol messages to use XRPAmounts * Includes Validations, Change transactions, the "Fees" ledger object, and subscription messages * Improve handling of 0 drop reference fee with TxQ. For use with networks that do not want to require fees * Note that fee escalation logic is still in place, which may cause the open ledger fee to rise if the network is busy. 0 drop transactions will still queue, and fee escalation can be effectively disabled by modifying the configuration on all nodes * Change default network reserves to match Mainnet * Name the new SFields *Drops (not *XRP) * Reserve SField IDs for Hooks * Clarify comments explaining the ttFEE transaction field validation
Transia-RnD · Mar 5, 2023 · 1819aeb · 1819aeb
1 parent 431fc01
commit 1819aeb
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Showing 46 changed files with 692 additions and 339 deletions.
diff --git a/src/ripple/app/consensus/RCLConsensus.cpp b/src/ripple/app/consensus/RCLConsensus.cpp
@@ -839,7 +839,8 @@ RCLConsensus::Adaptor::validate(
             if (ledger.ledger_->isVotingLedger())
             {
                 // Fees:
-                feeVote_->doValidation(ledger.ledger_->fees(), v);
+                feeVote_->doValidation(
+                    ledger.ledger_->fees(), ledger.ledger_->rules(), v);
 
                 // Amendments
                 // FIXME: pass `v` and have the function insert the array

diff --git a/src/ripple/app/ledger/Ledger.cpp b/src/ripple/app/ledger/Ledger.cpp
@@ -591,29 +591,9 @@ Ledger::setup(Config const& config)
 {
     bool ret = true;
 
-    fees_.base = config.FEE_DEFAULT;
-    fees_.units = config.TRANSACTION_FEE_BASE;
-    fees_.reserve = config.FEE_ACCOUNT_RESERVE;
-    fees_.increment = config.FEE_OWNER_RESERVE;
-
     try
     {
-        if (auto const sle = read(keylet::fees()))
-        {
-            // VFALCO NOTE Why getFieldIndex and not isFieldPresent?
-
-            if (sle->getFieldIndex(sfBaseFee) != -1)
-                fees_.base = sle->getFieldU64(sfBaseFee);
-
-            if (sle->getFieldIndex(sfReferenceFeeUnits) != -1)
-                fees_.units = sle->getFieldU32(sfReferenceFeeUnits);
-
-            if (sle->getFieldIndex(sfReserveBase) != -1)
-                fees_.reserve = sle->getFieldU32(sfReserveBase);
-
-            if (sle->getFieldIndex(sfReserveIncrement) != -1)
-                fees_.increment = sle->getFieldU32(sfReserveIncrement);
-        }
+        rules_ = makeRulesGivenLedger(*this, config.features);
     }
     catch (SHAMapMissingNode const&)
     {
@@ -624,9 +604,56 @@ Ledger::setup(Config const& config)
         Rethrow();
     }
 
+    fees_.base = config.FEE_DEFAULT;
+    fees_.reserve = config.FEE_ACCOUNT_RESERVE;
+    fees_.increment = config.FEE_OWNER_RESERVE;
+
     try
     {
-        rules_ = makeRulesGivenLedger(*this, config.features);
+        if (auto const sle = read(keylet::fees()))
+        {
+            bool oldFees = false;
+            bool newFees = false;
+            {
+                auto const baseFee = sle->at(~sfBaseFee);
+                auto const reserveBase = sle->at(~sfReserveBase);
+                auto const reserveIncrement = sle->at(~sfReserveIncrement);
+                if (baseFee)
+                    fees_.base = *baseFee;
+                if (reserveBase)
+                    fees_.reserve = *reserveBase;
+                if (reserveIncrement)
+                    fees_.increment = *reserveIncrement;
+                oldFees = baseFee || reserveBase || reserveIncrement;
+            }
+            {
+                auto const baseFeeXRP = sle->at(~sfBaseFeeDrops);
+                auto const reserveBaseXRP = sle->at(~sfReserveBaseDrops);
+                auto const reserveIncrementXRP =
+                    sle->at(~sfReserveIncrementDrops);
+                auto assign = [&ret](
+                                  XRPAmount& dest,
+                                  std::optional<STAmount> const& src) {
+                    if (src)
+                    {
+                        if (src->native())
+                            dest = src->xrp();
+                        else
+                            ret = false;
+                    }
+                };
+                assign(fees_.base, baseFeeXRP);
+                assign(fees_.reserve, reserveBaseXRP);
+                assign(fees_.increment, reserveIncrementXRP);
+                newFees = baseFeeXRP || reserveBaseXRP || reserveIncrementXRP;
+            }
+            if (oldFees && newFees)
+                // Should be all of one or the other, but not both
+                ret = false;
+            if (!rules_.enabled(featureXRPFees) && newFees)
+                // Can't populate the new fees before the amendment is enabled
+                ret = false;
+        }
     }
     catch (SHAMapMissingNode const&)
     {

diff --git a/src/ripple/app/misc/FeeVote.h b/src/ripple/app/misc/FeeVote.h
@@ -42,9 +42,6 @@ class FeeVote
         /** The cost of a reference transaction in drops. */
         XRPAmount reference_fee{10};
 
-        /** The cost of a reference transaction in fee units. */
-        static constexpr FeeUnit32 reference_fee_units{10};
-
         /** The account reserve requirement in drops. */
         XRPAmount account_reserve{10 * DROPS_PER_XRP};
 
@@ -60,7 +57,10 @@ class FeeVote
         @param baseValidation
     */
     virtual void
-    doValidation(Fees const& lastFees, STValidation& val) = 0;
+    doValidation(
+        Fees const& lastFees,
+        Rules const& rules,
+        STValidation& val) = 0;
 
     /** Cast our local vote on the fee.