From 86564e2a1b6e8641d85746f0d3ab3ee68a83f5ce Mon Sep 17 00:00:00 2001
From: Daniel Larimer <dan@bitshares.org>
Date: Mon, 27 Jul 2015 17:50:02 -0400
Subject: [PATCH] Resolve #207 Add API to get required fees.

---
 libraries/app/api.cpp                      | 10 ++++++++++
 libraries/app/include/graphene/app/api.hpp |  7 +++++++
 2 files changed, 17 insertions(+)

diff --git a/libraries/app/api.cpp b/libraries/app/api.cpp
index cbcb9295..a92b9ee7 100644
--- a/libraries/app/api.cpp
+++ b/libraries/app/api.cpp
@@ -1120,4 +1120,14 @@ namespace graphene { namespace app {
        return result;
     }
 
+    vector<asset> database_api::get_required_fees( const vector<operation>& ops, asset_id_type id )const
+    {
+       vector<asset> result;
+       result.reserve(ops.size());
+       const asset_object&  a = id(_db);
+       for( const auto& op : ops )
+          result.push_back( _db.current_fee_schedule().calculate_fee( op, a.options.core_exchange_rate ) );
+       return result;
+    }
+
 } } // graphene::app
diff --git a/libraries/app/include/graphene/app/api.hpp b/libraries/app/include/graphene/app/api.hpp
index 48de0024..50b46278 100644
--- a/libraries/app/include/graphene/app/api.hpp
+++ b/libraries/app/include/graphene/app/api.hpp
@@ -328,6 +328,12 @@ namespace graphene { namespace app {
          vector<blinded_balance_object> get_blinded_balances( const flat_set<commitment_type>& commitments )const;
 
 
+         /**
+          *  For each operation calculate the required fee in the specified asset type.  If the asset type does
+          *  not have a valid core_exchange_rate
+          */
+         vector<asset> get_required_fees( const vector<operation>& ops, asset_id_type id = asset_id_type() )const;
+
       private:
          /** called every time a block is applied to report the objects that were changed */
          void on_objects_changed(const vector<object_id_type>& ids);
@@ -541,6 +547,7 @@ FC_API(graphene::app::database_api,
        (get_required_signatures)
        (verify_authority)
        (get_blinded_balances)
+       (get_required_fees)
      )
 FC_API(graphene::app::history_api,
        (get_account_history)