From b30755718242d5f19935316c49c525fb7e52f98d Mon Sep 17 00:00:00 2001
From: root <oxarbitrage@gmail.com>
Date: Wed, 14 Jun 2017 17:47:18 +0000
Subject: [PATCH] add simple pagination to get_asset_holders

---
 libraries/app/api.cpp                      | 16 +++++++++++++++-
 libraries/app/include/graphene/app/api.hpp |  2 +-
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/libraries/app/api.cpp b/libraries/app/api.cpp
index d346e121..b7e37705 100644
--- a/libraries/app/api.cpp
+++ b/libraries/app/api.cpp
@@ -625,16 +625,25 @@ namespace graphene { namespace app {
     asset_api::asset_api(graphene::chain::database& db) : _db(db) { }
     asset_api::~asset_api() { }
 
-    vector<account_asset_balance> asset_api::get_asset_holders( asset_id_type asset_id ) const {
+    vector<account_asset_balance> asset_api::get_asset_holders( asset_id_type asset_id, uint32_t start, uint32_t limit ) const {
+
+      FC_ASSERT(limit <= 100);
 
       const auto& bal_idx = _db.get_index_type< account_balance_index >().indices().get< by_asset_balance >();
       auto range = bal_idx.equal_range( boost::make_tuple( asset_id ) );
 
       vector<account_asset_balance> result;
 
+      uint32_t total_counter = 0;
+      uint32_t start_counter = 0;
+
       for( const account_balance_object& bal : boost::make_iterator_range( range.first, range.second ) )
       {
+        //wdump((bal));
         if( bal.balance.value == 0 ) continue;
+        
+        start_counter++;
+        if( start >= start_counter ) continue;
 
         auto account = _db.find(bal.owner);
 
@@ -644,6 +653,11 @@ namespace graphene { namespace app {
         aab.amount     = bal.balance.value;
 
         result.push_back(aab);
+
+        if(total_counter >= limit) break;
+
+        total_counter++;
+
       }
 
       return result;
diff --git a/libraries/app/include/graphene/app/api.hpp b/libraries/app/include/graphene/app/api.hpp
index be511d3a..923c870b 100644
--- a/libraries/app/include/graphene/app/api.hpp
+++ b/libraries/app/include/graphene/app/api.hpp
@@ -305,7 +305,7 @@ namespace graphene { namespace app {
          asset_api(graphene::chain::database& db);
          ~asset_api();
 
-         vector<account_asset_balance> get_asset_holders( asset_id_type asset_id )const;
+         vector<account_asset_balance> get_asset_holders( asset_id_type asset_id, uint32_t start, uint32_t limit  )const;
          int get_asset_holders_count( asset_id_type asset_id )const;
          vector<asset_holders> get_all_asset_holders() const;