txdb: reject rbf.

lib/wallet/browser.js

@@ -176,6 +176,9 @@ layout.txdb = {
   },
   Cc: function Cc(key) {
     return this.ihii(key);
+  },
+  r: function r(hash) {
+    return this.ha('r', hash);
   }
 };
 

lib/wallet/txdb.js

@@ -189,6 +189,9 @@ var layout = {
   },
   Cc: function Cc(key) {
     return layout.ihii(key);
+  },
+  r: function r(hash) {
+    return layout.ha(0x72, hash);
   }
 };
 
@@ -688,18 +691,30 @@ TXDB.prototype.add = co(function* add(tx) {
  */
 
 TXDB.prototype._add = co(function* add(tx, info) {
-  var hash, path, account;
+  var hash = tx.hash('hex');
+  var path, account;
   var i, result, input, output, coin;
   var prevout, key, spender, raw;
 
   assert(!tx.mutable, 'Cannot add mutable TX to wallet.');
 
   if (tx.height === -1) {
+    // We ignore double spends from the mempool.
     if (yield this.isDoubleSpend(tx))
       return false;
+
+    // We ignore any unconfirmed txs
+    // that are replace-by-fee.
+    if (yield this.isRBF(tx)) {
+      this.put(layout.r(hash), DUMMY);
+      return false;
+    }
   } else {
     // This potentially removes double-spenders.
     yield this.removeConflicts(tx, info);
+
+    // Delete the replace-by-fee record.
+    this.del(layout.r(hash));
   }
 
   // Attempt to confirm tx before adding it.
@@ -709,8 +724,6 @@ TXDB.prototype._add = co(function* add(tx, info) {
   if (result)
     return true;
 
-  hash = tx.hash('hex');
-
   this.put(layout.t(hash), tx.toExtended());
 
   if (tx.height === -1)
@@ -903,6 +916,29 @@ TXDB.prototype.isDoubleSpend = co(function* isDoubleSpend(tx) {
   return false;
 });
 
+/**
+ * Test an entire transaction to see
+ * if any of its outpoints are replace by fee.
+ * @param {TX} tx
+ * @returns {Promise} - Returns Boolean.
+ */
+
+TXDB.prototype.isRBF = co(function* isRBF(tx) {
+  var i, input, prevout;
+
+  if (tx.isRBF())
+    return true;
+
+  for (i = 0; i < tx.inputs.length; i++) {
+    input = tx.inputs[i];
+    prevout = input.prevout;
+    if (yield this.has(layout.r(prevout.hash)))
+      return true;
+  }
+
+  return false;
+});
+
 /**
  * Test a whether a coin has been spent.
  * @param {Hash} hash