Touch amendment [DO NOT MERGE]

src/ripple/app/tx/impl/Transactor.cpp

@@ -1079,6 +1079,31 @@ Transactor::checkMultiSign(PreclaimContext const& ctx)
 
 //------------------------------------------------------------------------------
 
+// increment the touch counter on an account
+static void
+touchAccount(
+    ApplyView& view,
+    AccountID const& id,
+    std::optional<std::shared_ptr<SLE>> sle)
+{
+    if (!view.rules().enabled(featureTouch))
+        return;
+
+    if (!sle)
+        *sle = view.peek(keylet::account(id));
+
+    if (!(*sle))
+        return;
+
+    uint64_t tc = (*sle)->isFieldPresent(sfTouchCount)
+        ? (*sle)->getFieldU64(sfTouchCount)
+        : 0;
+
+    (*sle)->setFieldU64(sfTouchCount, tc + 1);
+
+    view.update(*sle);
+}
+
 static void
 removeUnfundedOffers(
     ApplyView& view,
@@ -1511,6 +1536,8 @@ Transactor::doTSH(
         if ((!canRollback && strong) || (canRollback && !strong))
             continue;
 
+        touchAccount(view, tshAccountID, {});
+
         auto klTshHook = keylet::hook(tshAccountID);
 
         auto tshHook = view.read(klTshHook);

src/ripple/protocol/Feature.h

@@ -74,7 +74,8 @@ 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 = 70;
+
+static constexpr std::size_t numFeatures = 71;
 
 /** Amendments that this server supports and the default voting behavior.
    Whether they are enabled depends on the Rules defined in the validated
@@ -356,6 +357,7 @@ extern uint256 const featureHooksUpdate1;
 extern uint256 const fixXahauV1;
 extern uint256 const fixXahauV2;
 extern uint256 const featureRemit;
+extern uint256 const featureTouch;
 extern uint256 const featureZeroB2M;
 extern uint256 const fixNSDelete;
 

src/ripple/protocol/SField.h

@@ -433,6 +433,7 @@ extern SF_UINT64 const sfReferenceCount;
 extern SF_UINT64 const sfRewardAccumulator;
 extern SF_UINT64 const sfAccountCount;
 extern SF_UINT64 const sfAccountIndex;
+extern SF_UINT64 const sfTouchCount;
 
 // 128-bit
 extern SF_UINT128 const sfEmailHash;

src/ripple/protocol/impl/Feature.cpp

@@ -462,6 +462,7 @@ REGISTER_FEATURE(HooksUpdate1,                  Supported::yes, VoteBehavior::De
 REGISTER_FIX    (fixXahauV1,                    Supported::yes, VoteBehavior::DefaultNo);
 REGISTER_FIX    (fixXahauV2,                    Supported::yes, VoteBehavior::DefaultNo);
 REGISTER_FEATURE(Remit,                         Supported::yes, VoteBehavior::DefaultNo);
+REGISTER_FEATURE(Touch,                         Supported::yes, VoteBehavior::DefaultNo);
 REGISTER_FEATURE(ZeroB2M,                       Supported::yes, VoteBehavior::DefaultNo);
 REGISTER_FIX    (fixNSDelete,                   Supported::yes, VoteBehavior::DefaultNo);
 

src/ripple/protocol/impl/LedgerFormats.cpp

@@ -66,6 +66,7 @@ LedgerFormats::LedgerFormats()
             {sfGovernanceFlags,      soeOPTIONAL},
             {sfGovernanceMarks,      soeOPTIONAL},
             {sfAccountIndex,         soeOPTIONAL},
+            {sfTouchCount,           soeOPTIONAL},
         },
         commonFields);
 

src/ripple/protocol/impl/SField.cpp

@@ -183,6 +183,7 @@ CONSTRUCT_TYPED_SFIELD(sfEmitBurden,            "EmitBurden",           UINT64,
 CONSTRUCT_TYPED_SFIELD(sfHookInstructionCount,  "HookInstructionCount", UINT64,    17);
 CONSTRUCT_TYPED_SFIELD(sfHookReturnCode,        "HookReturnCode",       UINT64,    18);
 CONSTRUCT_TYPED_SFIELD(sfReferenceCount,        "ReferenceCount",       UINT64,    19);
+CONSTRUCT_TYPED_SFIELD(sfTouchCount,            "TouchCount",           UINT64,    97);
 CONSTRUCT_TYPED_SFIELD(sfAccountIndex,          "AccountIndex",         UINT64,    98);
 CONSTRUCT_TYPED_SFIELD(sfAccountCount,          "AccountCount",         UINT64,    99);
 CONSTRUCT_TYPED_SFIELD(sfRewardAccumulator,     "RewardAccumulator",    UINT64,   100);