Reject expired transactions immediately

src/ripple_app/ledger/LedgerMaster.cpp

@@ -104,11 +104,16 @@ public:
     {
     }
 
-    std::uint32_t getCurrentLedgerIndex ()
+    LedgerIndex getCurrentLedgerIndex ()
     {
         return mCurrentLedger.get ()->getLedgerSeq ();
     }
 
+    LedgerIndex getValidLedgerIndex ()
+    {
+        return mValidLedgerSeq;
+    }
+
     int getPublishedLedgerAge ()
     {
         std::uint32_t pubClose = mPubLedgerClose.load();

src/ripple_app/ledger/LedgerMaster.h

@@ -47,7 +47,8 @@ public:
 
     virtual ~LedgerMaster () = 0;
 
-    virtual std::uint32_t getCurrentLedgerIndex () = 0;
+    virtual LedgerIndex getCurrentLedgerIndex () = 0;
+    virtual LedgerIndex getValidLedgerIndex () = 0;
 
     virtual LockType& peekMutex () = 0;