integrate rng for winner tickets

libraries/app/database_api.cpp

@@ -3200,34 +3200,7 @@ vector<uint64_t> database_api::get_random_number_ex(uint64_t minimum, uint64_t m
 
 vector<uint64_t> database_api_impl::get_random_number_ex(uint64_t minimum, uint64_t maximum, uint64_t selections, bool duplicates) const
 {
-   FC_ASSERT( selections <= 100000 );
-   if (duplicates == false) {
-      FC_ASSERT( maximum - minimum >= selections );
-   }
-
-   vector<uint64_t> v;
-   v.reserve(selections);
-
-   if (duplicates) {
-      for (uint64_t i = 0; i < selections; i++) {
-         int64_t rnd = _db.get_random_bits(maximum - minimum) + minimum;
-         v.push_back(rnd);
-      }
-   } else {
-      vector<uint64_t> tmpv;
-      tmpv.reserve(selections);
-      for (uint64_t i = minimum; i < maximum; i++) {
-         tmpv.push_back(i);
-      }
-
-      for (uint64_t i = 0; (i < selections) && (tmpv.size() > 0); i++) {
-         uint64_t idx = _db.get_random_bits(tmpv.size());
-         v.push_back(tmpv.at(idx));
-         tmpv.erase(tmpv.begin() + idx);
-      }
-   }
-
-   return v;
+   return _db.get_random_numbers(minimum, maximum, selections, duplicates);
 }
 
 uint64_t database_api::get_random_number(uint64_t bound) const

libraries/app/include/graphene/app/database_api.hpp

@@ -934,7 +934,7 @@ class database_api
       // ACCOUNT ROLE //
       //////////////////
       vector<account_role_object> get_account_roles_by_owner(account_id_type owner) const;
-private:
+
       /////////////////////////////
       // Random number generator //
       /////////////////////////////

libraries/chain/db_getter.cpp

@@ -315,4 +315,36 @@ bool database::is_son_active( son_id_type son_id )
    return (it_son != active_son_ids.end());
 }
 
+vector<uint64_t> database::get_random_numbers(uint64_t minimum, uint64_t maximum, uint64_t selections, bool duplicates)
+{
+   FC_ASSERT( selections <= 100000 );
+   if (duplicates == false) {
+      FC_ASSERT( maximum - minimum >= selections );
+   }
+
+   vector<uint64_t> v;
+   v.reserve(selections);
+
+   if (duplicates) {
+      for (uint64_t i = 0; i < selections; i++) {
+         int64_t rnd = get_random_bits(maximum - minimum) + minimum;
+         v.push_back(rnd);
+      }
+   } else {
+      vector<uint64_t> tmpv;
+      tmpv.reserve(selections);
+      for (uint64_t i = minimum; i < maximum; i++) {
+         tmpv.push_back(i);
+      }
+
+      for (uint64_t i = 0; (i < selections) && (tmpv.size() > 0); i++) {
+         uint64_t idx = get_random_bits(tmpv.size());
+         v.push_back(tmpv.at(idx));
+         tmpv.erase(tmpv.begin() + idx);
+      }
+   }
+
+   return v;
+}
+
 } }

libraries/chain/include/graphene/chain/database.hpp

@@ -325,6 +325,7 @@ namespace graphene { namespace chain {
 
          uint32_t last_non_undoable_block_num() const;
          vector<authority> get_account_custom_authorities(account_id_type account, const operation& op)const;
+         vector<uint64_t> get_random_numbers(uint64_t minimum, uint64_t maximum, uint64_t selections, bool duplicates);
          //////////////////// db_init.cpp ////////////////////
 
          void initialize_evaluators();

libraries/chain/nft_lottery_object.cpp

@@ -89,7 +89,8 @@ namespace graphene
                     structurized_participants.emplace(holder, vector<uint16_t>());
             }
             uint64_t jackpot = get_lottery_jackpot(db).amount.value;
-            auto winner_numbers = db.get_winner_numbers(id, holders.size(), lottery_options.winning_tickets.size());
+            auto selections = lottery_options.winning_tickets.size() <= holders.size() ? lottery_options.winning_tickets.size() : holders.size();
+            auto winner_numbers = db.get_random_numbers(0, holders.size(), selections, false);
 
             auto &tickets(lottery_options.winning_tickets);
 
@@ -167,4 +168,4 @@ namespace graphene
             db.apply_operation(eval, end_op);
         }
     } // namespace chain
-} // namespace graphene
+} // namespace graphene