From 940b158c2a5952610f0faa3d1ace2e5b8f746479 Mon Sep 17 00:00:00 2001
From: liukunyu <boss.liuky@gmail.com>
Date: Fri, 30 Nov 2018 14:34:06 +0800
Subject: [PATCH] fix: fix get_require_fees crash

---
 libraries/app/database_api_impl.cpp | 8 ++++++++
 libraries/chain/wasm_interface.cpp  | 3 ++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/libraries/app/database_api_impl.cpp b/libraries/app/database_api_impl.cpp
index 590b6b06..609ff3d9 100644
--- a/libraries/app/database_api_impl.cpp
+++ b/libraries/app/database_api_impl.cpp
@@ -1283,6 +1283,12 @@ vector< fc::variant > database_api_impl::get_required_fees( const vector<operati
        return result;
    }
 
+
+   transaction trx;
+   for( operation& op : _ops )
+	   trx.operations.push_back(op);
+   _db.set_cur_trx(&trx);
+
    for( operation& op : _ops )
    {
        if (op.which() == operation::tag<contract_call_operation>::value) {
@@ -1327,6 +1333,8 @@ vector< fc::variant > database_api_impl::get_required_fees( const vector<operati
            result.push_back(helper.set_op_fees(op));
       }
    }
+
+   _db.set_cur_trx(nullptr);
    return result;
 }
 
diff --git a/libraries/chain/wasm_interface.cpp b/libraries/chain/wasm_interface.cpp
index 2dfc2fa4..9984c38d 100644
--- a/libraries/chain/wasm_interface.cpp
+++ b/libraries/chain/wasm_interface.cpp
@@ -1083,7 +1083,7 @@ class context_free_transaction_api : public context_aware_api {
       int read_transaction(array_ptr<char> data, size_t buffer_size)
       {
           const transaction* cur_trx = context.db().get_cur_trx();
-          FC_ASSERT(nullptr != cur_trx, "cur_trx is null");
+          FC_ASSERT(nullptr != cur_trx, "current transaction not set");
           bytes trx = fc::raw::pack(*cur_trx);
 
           auto s = trx.size();
@@ -1097,6 +1097,7 @@ class context_free_transaction_api : public context_aware_api {
 
       int transaction_size() {
           const transaction* trx = context.db().get_cur_trx();
+          FC_ASSERT(nullptr != trx, "current transaction not set");
           return fc::raw::pack(*trx).size();
       }