NetworkOPs function to test if we have in our database a specified range of ledger numbers.

src/cpp/ripple/LedgerMaster.cpp

@@ -117,6 +117,12 @@ TER LedgerMaster::doTransaction(const SerializedTransaction& txn, TransactionEng
 	return result;
 }
 
+bool LedgerMaster::haveLedgerRange(uint32 from, uint32 to)
+{
+	uint32 prevMissing = mCompleteLedgers.prevMissing(to + 1);
+	return (prevMissing == RangeSet::RangeSetAbsent) || (prevMissing < from);
+}
+
 void LedgerMaster::acquireMissingLedger(const uint256& ledgerHash, uint32 ledgerSeq)
 {
 	mMissingLedger = theApp->getMasterLedgerAcquire().findCreate(ledgerHash);

src/cpp/ripple/LedgerMaster.h

@@ -93,6 +93,8 @@ public:
 
 	void addHeldTransaction(const Transaction::pointer& trans);
 
+	bool haveLedgerRange(uint32 from, uint32 to);
+
 	void sweep(void) { mLedgerHistory.sweep(); }
 };
 

src/cpp/ripple/NetworkOPs.cpp

@@ -81,6 +81,11 @@ uint32 NetworkOPs::getCurrentLedgerID()
 	return mLedgerMaster->getCurrentLedger()->getLedgerSeq();
 }
 
+bool NetworkOPs::haveLedgerRange(uint32 from, uint32 to)
+{
+	return mLedgerMaster->haveLedgerRange(from, to);
+}
+
 void NetworkOPs::submitTransaction(Job&, SerializedTransaction::pointer iTrans, stCallback callback)
 { // this is an asynchronous interface
 	Serializer s;

src/cpp/ripple/NetworkOPs.h

@@ -134,6 +134,9 @@ public:
 
 	uint256			getClosedLedgerHash()					{ return mLedgerMaster->getClosedLedger()->getHash(); }
 
+	// Do we have this inclusive range of ledgers in our database
+	bool haveLedgerRange(uint32 from, uint32 to);
+
 	SerializedValidation::ref getLastValidation()			{ return mLastValidation; }
 	void setLastValidation(SerializedValidation::ref v)		{ mLastValidation = v; }