merge gpos to develop (#186)

* issue - 154: Don't allow to vote when vesting balance is 0

* changes to withdraw_vesting feature(for both cdd and GPOS)

* Comments update

* update to GPOS hardfork ref

* fix for get_vesting_balance API call

* braces update

* Create .gitlab-ci.yml

* fixing build errors (#150)

* fixing build errors

vest type correction

* fixing build errors

vest type correction

* fixes 

new Dockerfile

* vesting_balance_type correction

vesting_balance_type changed to normal

* gcc5 support to Dockerfile

gcc5 support to Dockerfile

* Changes to compiple with GCC 7(Ubuntu 18.04)

* changes to have separate methods and single withdrawl fee for multiple vest objects

* 163-fix, Return only non-zero vesting balances

* Revert "Revert "GPOS protocol""

This reverts commit 6761641.

* add new line needed to gpos hardfork file

* comment temporally cli_vote_for_2_witnesses until refactor or delete

* fix gpos tests

* fix gitlab-ci conflict

.gitlab-ci.yml

@@ -30,7 +30,7 @@ test:
     - ./tests/cli_test
   tags:
     - builder
-    
+
 code_quality:
   stage: test
   image: docker:stable

libraries/app/database_api.cpp

@@ -171,6 +171,8 @@ class database_api_impl : public std::enable_shared_from_this<database_api_impl>
       vector<tournament_object> get_tournaments_by_state(tournament_id_type stop, unsigned limit, tournament_id_type start, tournament_state state);
       vector<tournament_id_type> get_registered_tournaments(account_id_type account_filter, uint32_t limit) const;
 
+      // gpos
+      gpos_info get_gpos_info(const account_id_type account) const;
 
    //private:
       template<typename T>
@@ -934,7 +936,8 @@ vector<vesting_balance_object> database_api_impl::get_vesting_balances( account_
       auto vesting_range = _db.get_index_type<vesting_balance_index>().indices().get<by_account>().equal_range(account_id);
       std::for_each(vesting_range.first, vesting_range.second,
                     [&result](const vesting_balance_object& balance) {
-                       result.emplace_back(balance);
+                        if(balance.balance.amount > 0)
+                           result.emplace_back(balance);
                     });
       return result;
    }
@@ -2130,6 +2133,55 @@ vector<tournament_id_type> database_api_impl::get_registered_tournaments(account
    return tournament_ids;
 }
 
+//////////////////////////////////////////////////////////////////////
+//                                                                  //
+// GPOS methods                                                     //
+//                                                                  //
+//////////////////////////////////////////////////////////////////////
+
+graphene::app::gpos_info database_api::get_gpos_info(const account_id_type account) const
+{
+   return my->get_gpos_info(account);
+
+}
+graphene::app::gpos_info database_api_impl::get_gpos_info(const account_id_type account) const
+{
+   gpos_info result;
+   result.vesting_factor = _db.calculate_vesting_factor(account(_db));
+
+   const auto& dividend_data = asset_id_type()(_db).dividend_data(_db);
+   const account_object& dividend_distribution_account = dividend_data.dividend_distribution_account(_db);
+   result.award = _db.get_balance(dividend_distribution_account, asset_id_type()(_db));
+
+   share_type total_amount;
+   auto balance_type = vesting_balance_type::gpos;
+#ifdef USE_VESTING_OBJECT_BY_ASSET_BALANCE_INDEX
+   // get only once a collection of accounts that hold nonzero vesting balances of the dividend asset
+   auto vesting_balances_begin =
+      vesting_index.indices().get<by_asset_balance>().lower_bound(boost::make_tuple(asset_id_type(), balance_type));
+   auto vesting_balances_end =
+      vesting_index.indices().get<by_asset_balance>().upper_bound(boost::make_tuple(asset_id_type(), balance_type, share_type()));
+
+   for (const vesting_balance_object& vesting_balance_obj : boost::make_iterator_range(vesting_balances_begin, vesting_balances_end))
+   {
+        total_amount += vesting_balance_obj.balance.amount;
+   }
+#else
+   const vesting_balance_index& vesting_index = _db.get_index_type<vesting_balance_index>();
+   const auto& vesting_balances = vesting_index.indices().get<by_id>();
+   for (const vesting_balance_object& vesting_balance_obj : vesting_balances)
+   {
+      if (vesting_balance_obj.balance.asset_id == asset_id_type() && vesting_balance_obj.balance_type == balance_type)
+      {
+         total_amount += vesting_balance_obj.balance.amount;
+      }
+   }
+#endif
+
+   result.total_amount = total_amount;
+   return result;
+}
+
 //////////////////////////////////////////////////////////////////////
 //                                                                  //
 // Private methods                                                  //

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

@@ -114,6 +114,12 @@ struct market_trade
    double                     value;
 };
 
+struct gpos_info {
+   double vesting_factor;
+   asset award;
+   share_type total_amount;
+};
+
 /**
  * @brief The database_api class implements the RPC API for the chain database.
  *
@@ -673,7 +679,17 @@ class database_api
        */
       vector<tournament_id_type> get_registered_tournaments(account_id_type account_filter, uint32_t limit) const;
 
-   private:
+      //////////
+      // GPOS //
+      //////////
+      /**
+       * @return account and network GPOS information
+       */
+      gpos_info get_gpos_info(const account_id_type account) const;
+
+
+
+private:
       std::shared_ptr< database_api_impl > my;
 };
 
@@ -684,6 +700,8 @@ FC_REFLECT( graphene::app::order_book, (base)(quote)(bids)(asks) );
 FC_REFLECT( graphene::app::market_ticker, (base)(quote)(latest)(lowest_ask)(highest_bid)(percent_change)(base_volume)(quote_volume) );
 FC_REFLECT( graphene::app::market_volume, (base)(quote)(base_volume)(quote_volume) );
 FC_REFLECT( graphene::app::market_trade, (date)(price)(amount)(value) );
+FC_REFLECT( graphene::app::gpos_info, (vesting_factor)(award)(total_amount) );
+
 
 FC_API(graphene::app::database_api,
    // Objects
@@ -801,4 +819,7 @@ FC_API(graphene::app::database_api,
    (get_tournaments_by_state)
    (get_tournaments )
    (get_registered_tournaments)
+
+   // gpos
+   (get_gpos_info)
 )