Add database memory usage to 'get_counts' output.

src/cpp/database/SqliteDatabase.cpp

@@ -196,6 +196,10 @@ uint64 SqliteDatabase::getBigInt(int colIndex)
 	return(sqlite3_column_int64(mCurrentStmt, colIndex));
 }
 
+int SqliteDatabase::getKBUsed()
+{
+	return static_cast<int>(sqlite3_memory_used() / 1024);
+}
 
 static int SqliteWALHook(void *s, sqlite3* dbCon, const char *dbName, int walSize)
 {

src/cpp/database/SqliteDatabase.h

@@ -57,6 +57,8 @@ public:
 
 	void runWal();
 	void doHook(const char *db, int walSize);
+
+	int getKBUsed();
 };
 
 class SqliteStatement

src/cpp/database/database.h

@@ -89,6 +89,7 @@ public:
 
 	virtual bool setupCheckpointing(JobQueue*)	{ return false; }
 	virtual SqliteDatabase* getSqliteDB()		{ return NULL; }
+	virtual int getKBUsed()						{ return -1; }
 };
 
 #endif

src/cpp/ripple/RPCHandler.cpp

@@ -1803,6 +1803,10 @@ Json::Value RPCHandler::doGetCounts(Json::Value jvRequest)
 	BOOST_FOREACH(InstanceType::InstanceCount& it, count)
 		ret[it.first] = it.second;
 
+	int dbKB = theApp->getLedgerDB()->getDB()->getKBUsed();
+	if (dbKB > 0)
+		ret["dbKB"] = dbKB;
+
 	return ret;
 }