Improved performance for epee serialization:

  - Removed copy of field names in binary deserialization
  - Removed copy of array values in binary deserialization
  - Removed copy of string values in json deserialization
  - Removed unhelpful allocation in json string value parsing
  - Removed copy of blob data on binary and json serialization

7 files changed, 56 insertions, 59 deletions

diff --git a/contrib/epee/include/serialization/keyvalue_serialization_overloads.h b/contrib/epee/include/serialization/keyvalue_serialization_overloads.h
index fc8b90a2c..1f9d6b6d7 100644
--- a/contrib/epee/include/serialization/keyvalue_serialization_overloads.h
+++ b/contrib/epee/include/serialization/keyvalue_serialization_overloads.h
@@ -48,22 +48,10 @@ namespace epee
 
     //-------------------------------------------------------------------------------------------------------------------
     template<class t_type, class t_storage>
-    static bool serialize_t_val(const t_type& d, t_storage& stg, typename t_storage::hsection hparent_section, const char* pname)
-    {
-      return stg.set_value(pname, d, hparent_section);
-    }
-    //-------------------------------------------------------------------------------------------------------------------
-    template<class t_type, class t_storage>
-    static bool unserialize_t_val(t_type& d, t_storage& stg, typename t_storage::hsection hparent_section, const char* pname)
-    {
-      return stg.get_value(pname, d, hparent_section);
-    } 
-    //-------------------------------------------------------------------------------------------------------------------
-    template<class t_type, class t_storage>
     static bool serialize_t_val_as_blob(const t_type& d, t_storage& stg, typename t_storage::hsection hparent_section, const char* pname)
     {      
       std::string blob((const char *)&d, sizeof(d));
-      return stg.set_value(pname, blob, hparent_section);
+      return stg.set_value(pname, std::move(blob), hparent_section);
     }
     //-------------------------------------------------------------------------------------------------------------------
     template<class t_type, class t_storage>
@@ -114,13 +102,15 @@ namespace epee
     template<class stl_container, class t_storage>
     static bool serialize_stl_container_t_val  (const stl_container& container, t_storage& stg, typename t_storage::hsection hparent_section, const char* pname)
     {
+      using value_type = typename stl_container::value_type;
+
       if(!container.size()) return true;
       typename stl_container::const_iterator it = container.begin();
-      typename t_storage::harray hval_array = stg.insert_first_value(pname, *it, hparent_section);
+      typename t_storage::harray hval_array = stg.insert_first_value(pname, value_type(*it), hparent_section);
       CHECK_AND_ASSERT_MES(hval_array, false, "failed to insert first value to storage");
       it++;
       for(;it!= container.end();it++)
-        stg.insert_next_value(hval_array, *it);
+        stg.insert_next_value(hval_array, value_type(*it));
 
       return true;
     }
@@ -149,7 +139,7 @@ namespace epee
         *p_elem = v;
         p_elem++;
       }
-      return stg.set_value(pname, mb, hparent_section);
+      return stg.set_value(pname, std::move(mb), hparent_section);
     }
     //--------------------------------------------------------------------------------------------------------------------
     template<class stl_container, class t_storage>
@@ -221,7 +211,7 @@ namespace epee
       template<class t_type, class t_storage>
       static bool kv_serialize(const t_type& d, t_storage& stg, typename t_storage::hsection hparent_section, const char* pname)
       {
-        return stg.set_value(pname, d, hparent_section);
+        return stg.set_value(pname, t_type(d), hparent_section);
       }
       //-------------------------------------------------------------------------------------------------------------------
       template<class t_type, class t_storage>
diff --git a/contrib/epee/include/storages/parserse_base_utils.h b/contrib/epee/include/storages/parserse_base_utils.h
index fe53628a5..8a498130c 100644
--- a/contrib/epee/include/storages/parserse_base_utils.h
+++ b/contrib/epee/include/storages/parserse_base_utils.h
@@ -157,7 +157,6 @@ namespace misc_utils
         while (fi != buf_end && ((lut[(uint8_t)*fi] & 32)) == 0)
           ++fi;
         val.assign(it, fi);
-        val.reserve(std::distance(star_end_string, buf_end));
         it = fi;
         for(;it != buf_end;it++)
         {
diff --git a/contrib/epee/include/storages/portable_storage.h b/contrib/epee/include/storages/portable_storage.h
index d0e40d606..4b759a24f 100644
--- a/contrib/epee/include/storages/portable_storage.h
+++ b/contrib/epee/include/storages/portable_storage.h
@@ -28,6 +28,8 @@
 
 #pragma once 
 
+#include <type_traits>
+
 #include "misc_language.h"
 #include "portable_storage_base.h"
 #include "portable_storage_to_bin.h"
@@ -59,7 +61,7 @@ namespace epee
       bool       get_value(const std::string& value_name, t_value& val, hsection hparent_section);
       bool       get_value(const std::string& value_name, storage_entry& val, hsection hparent_section);
       template<class t_value>
-      bool       set_value(const std::string& value_name, const t_value& target, hsection hparent_section);
+      bool       set_value(const std::string& value_name, t_value&& target, hsection hparent_section);
 
       //serial access for arrays of values --------------------------------------
       //values
@@ -68,9 +70,9 @@ namespace epee
       template<class t_value>
       bool          get_next_value(harray hval_array, t_value& target);
       template<class t_value>
-      harray insert_first_value(const std::string& value_name, const t_value& target, hsection hparent_section);
+      harray insert_first_value(const std::string& value_name, t_value&& target, hsection hparent_section);
       template<class t_value>
-      bool          insert_next_value(harray hval_array, const t_value& target);
+      bool          insert_next_value(harray hval_array, t_value&& target);
       //sections
       harray get_first_section(const std::string& pSectionName, hsection& h_child_section, hsection hparent_section);
       bool            get_next_section(harray hSecArray, hsection& h_child_section);
@@ -94,7 +96,7 @@ namespace epee
       hsection	get_root_section() {return &m_root;}
       storage_entry* find_storage_entry(const std::string& pentry_name, hsection psection);
       template<class entry_type>
-      storage_entry* insert_new_entry_get_storage_entry(const std::string& pentry_name, hsection psection, const entry_type& entry);
+      storage_entry* insert_new_entry_get_storage_entry(const std::string& pentry_name, hsection psection, entry_type&& entry);
 
       hsection    insert_new_section(const std::string& pentry_name, hsection psection);
 
@@ -241,21 +243,22 @@ namespace epee
     }
     //---------------------------------------------------------------------------------------------------------------
     template<class t_value>
-    bool portable_storage::set_value(const std::string& value_name, const t_value& v, hsection hparent_section)        
+    bool portable_storage::set_value(const std::string& value_name, t_value&& v, hsection hparent_section)
     {
-      BOOST_MPL_ASSERT(( boost::mpl::contains<boost::mpl::push_front<storage_entry::types, storage_entry>::type, t_value> )); 
+      using t_real_value = typename std::decay<t_value>::type;
+      BOOST_MPL_ASSERT(( boost::mpl::contains<boost::mpl::push_front<storage_entry::types, storage_entry>::type, t_real_value> ));
       TRY_ENTRY();
       if(!hparent_section)
         hparent_section = &m_root;
       storage_entry* pentry = find_storage_entry(value_name, hparent_section);
       if(!pentry)
       {
-        pentry = insert_new_entry_get_storage_entry(value_name, hparent_section, v);
+        pentry = insert_new_entry_get_storage_entry(value_name, hparent_section, std::forward<t_value>(v));
         if(!pentry)
           return false;
         return true;
       }
-      *pentry = storage_entry(v);
+      *pentry = std::forward<t_value>(v);
       return true;
       CATCH_ENTRY("portable_storage::template<>set_value", false);
     }
@@ -274,11 +277,12 @@ namespace epee
     }
     //---------------------------------------------------------------------------------------------------------------
     template<class entry_type>
-    storage_entry* portable_storage::insert_new_entry_get_storage_entry(const std::string& pentry_name, hsection psection, const entry_type& entry)
+    storage_entry* portable_storage::insert_new_entry_get_storage_entry(const std::string& pentry_name, hsection psection, entry_type&& entry)
     {
+      static_assert(std::is_rvalue_reference<entry_type&&>(), "unexpected copy of value");
       TRY_ENTRY();
       CHECK_AND_ASSERT(psection, nullptr);
-      auto ins_res = psection->m_entries.insert(std::pair<std::string, storage_entry>(pentry_name, entry));
+      auto ins_res = psection->m_entries.emplace(pentry_name, std::forward<entry_type>(entry));
       return &ins_res.first->second;
       CATCH_ENTRY("portable_storage::insert_new_entry_get_storage_entry", nullptr);
     }
@@ -362,41 +366,45 @@ namespace epee
     } 
     //---------------------------------------------------------------------------------------------------------------
     template<class t_value>
-    harray portable_storage::insert_first_value(const std::string& value_name, const t_value& target, hsection hparent_section)
+    harray portable_storage::insert_first_value(const std::string& value_name, t_value&& target, hsection hparent_section)
     {
+      using t_real_value = typename std::decay<t_value>::type;
+      static_assert(std::is_rvalue_reference<t_value&&>(), "unexpected copy of value");
       TRY_ENTRY();
       if(!hparent_section) hparent_section = &m_root;
       storage_entry* pentry = find_storage_entry(value_name, hparent_section);
       if(!pentry)
       {
-        pentry = insert_new_entry_get_storage_entry(value_name, hparent_section, array_entry(array_entry_t<t_value>()));
+        pentry = insert_new_entry_get_storage_entry(value_name, hparent_section, array_entry(array_entry_t<t_real_value>()));
         if(!pentry)
           return nullptr;
       }
       if(pentry->type() != typeid(array_entry))
-        *pentry = storage_entry(array_entry(array_entry_t<t_value>()));
+        *pentry = storage_entry(array_entry(array_entry_t<t_real_value>()));
 
       array_entry& arr = boost::get<array_entry>(*pentry);
-      if(arr.type() != typeid(array_entry_t<t_value>))
-        arr = array_entry(array_entry_t<t_value>());
+      if(arr.type() != typeid(array_entry_t<t_real_value>))
+        arr = array_entry(array_entry_t<t_real_value>());
 
-      array_entry_t<t_value>& arr_typed = boost::get<array_entry_t<t_value> >(arr);
-      arr_typed.insert_first_val(target);
+      array_entry_t<t_real_value>& arr_typed = boost::get<array_entry_t<t_real_value> >(arr);
+      arr_typed.insert_first_val(std::forward<t_value>(target));
       return &arr;
       CATCH_ENTRY("portable_storage::insert_first_value", nullptr);
     }
     //---------------------------------------------------------------------------------------------------------------
     template<class t_value>
-    bool portable_storage::insert_next_value(harray hval_array, const t_value& target)
+    bool portable_storage::insert_next_value(harray hval_array, t_value&& target)
     {
+      using t_real_value = typename std::decay<t_value>::type;
+      static_assert(std::is_rvalue_reference<t_value&&>(), "unexpected copy of value");
       TRY_ENTRY();
       CHECK_AND_ASSERT(hval_array, false);
 
-      CHECK_AND_ASSERT_MES(hval_array->type() == typeid(array_entry_t<t_value>), 
-        false, "unexpected type in insert_next_value: " << typeid(array_entry_t<t_value>).name());
+      CHECK_AND_ASSERT_MES(hval_array->type() == typeid(array_entry_t<t_real_value>),
+        false, "unexpected type in insert_next_value: " << typeid(array_entry_t<t_real_value>).name());
 
-      array_entry_t<t_value>& arr_typed = boost::get<array_entry_t<t_value> >(*hval_array);
-      arr_typed.insert_next_value(target);
+      array_entry_t<t_real_value>& arr_typed = boost::get<array_entry_t<t_real_value> >(*hval_array);
+      arr_typed.insert_next_value(std::forward<t_value>(target));
       return true;
       CATCH_ENTRY("portable_storage::insert_next_value", false);
     }
diff --git a/contrib/epee/include/storages/portable_storage_base.h b/contrib/epee/include/storages/portable_storage_base.h
index ca7c81ddc..40c7524fb 100644
--- a/contrib/epee/include/storages/portable_storage_base.h
+++ b/contrib/epee/include/storages/portable_storage_base.h
@@ -111,16 +111,16 @@ namespace epee
         return (t_entry_type*)&(*(m_it++));//fuckoff
       }
 
-      t_entry_type& insert_first_val(const t_entry_type& v)
+      t_entry_type& insert_first_val(t_entry_type&& v)
       {
         m_array.clear();
         m_it = m_array.end();
-        return insert_next_value(v);
+        return insert_next_value(std::move(v));
       }
 
-      t_entry_type& insert_next_value(const t_entry_type& v)
+      t_entry_type& insert_next_value(t_entry_type&& v)
       {
-        m_array.push_back(v);
+        m_array.push_back(std::move(v));
         return m_array.back();
       }
 
diff --git a/contrib/epee/include/storages/portable_storage_from_bin.h b/contrib/epee/include/storages/portable_storage_from_bin.h
index c0b6cc7b1..b39dc7c92 100644
--- a/contrib/epee/include/storages/portable_storage_from_bin.h
+++ b/contrib/epee/include/storages/portable_storage_from_bin.h
@@ -143,7 +143,7 @@ namespace epee
       //TODO: add some optimization here later
       while(size--)
         sa.m_array.push_back(read<type_name>());
-      return storage_entry(array_entry(sa));
+      return storage_entry(array_entry(std::move(sa)));
     }
 
     inline 
@@ -213,7 +213,7 @@ namespace epee
     {
       RECURSION_LIMITATION();
       section s;//use extra variable due to vs bug, line "storage_entry se(section()); " can't be compiled in visual studio
-      storage_entry se(s);
+      storage_entry se(std::move(s));
       section& section_entry = boost::get<section>(se);
       read(section_entry);
       return se;
@@ -268,7 +268,7 @@ namespace epee
         //read section name string
         std::string sec_name;
         read_sec_name(sec_name);
-        sec.m_entries.insert(std::make_pair(sec_name, load_storage_entry()));
+        sec.m_entries.emplace(std::move(sec_name), load_storage_entry());
       }
     }
     inline 
diff --git a/contrib/epee/include/storages/portable_storage_from_json.h b/contrib/epee/include/storages/portable_storage_from_json.h
index 3e3052541..2b2dc7ff9 100644
--- a/contrib/epee/include/storages/portable_storage_from_json.h
+++ b/contrib/epee/include/storages/portable_storage_from_json.h
@@ -128,20 +128,20 @@ namespace epee
                   errno = 0;
                   int64_t nval = strtoll(val.data(), NULL, 10);
                   if (errno) throw std::runtime_error("Invalid number: " + std::string(val));
-                  stg.set_value(name, nval, current_section);              
+                  stg.set_value(name, int64_t(nval), current_section);
                 }else
                 {
                   errno = 0;
                   uint64_t nval = strtoull(val.data(), NULL, 10);
                   if (errno) throw std::runtime_error("Invalid number: " + std::string(val));
-                  stg.set_value(name, nval, current_section);              
+                  stg.set_value(name, uint64_t(nval), current_section);
                 }
               }else
               {
                 errno = 0;
                 double nval = strtod(val.data(), NULL);
                 if (errno) throw std::runtime_error("Invalid number: " + std::string(val));
-                stg.set_value(name, nval, current_section);              
+                stg.set_value(name, double(nval), current_section);
               }
               state = match_state_wonder_after_value;
             }else if(isalpha(*it) )
@@ -219,13 +219,13 @@ namespace epee
                   errno = 0;
                   int64_t nval = strtoll(val.data(), NULL, 10);
                   if (errno) throw std::runtime_error("Invalid number: " + std::string(val));
-                  h_array = stg.insert_first_value(name, nval, current_section);
+                  h_array = stg.insert_first_value(name, int64_t(nval), current_section);
                 }else
                 {
                   errno = 0;
                   uint64_t nval = strtoull(val.data(), NULL, 10);
                   if (errno) throw std::runtime_error("Invalid number: " + std::string(val));
-                  h_array = stg.insert_first_value(name, nval, current_section);
+                  h_array = stg.insert_first_value(name, uint64_t(nval), current_section);
                 }
                 CHECK_AND_ASSERT_THROW_MES(h_array, " failed to insert values section entry");
               }else
@@ -233,7 +233,7 @@ namespace epee
                 errno = 0;
                 double nval = strtod(val.data(), NULL);
                 if (errno) throw std::runtime_error("Invalid number: " + std::string(val));
-                h_array = stg.insert_first_value(name, nval, current_section);
+                h_array = stg.insert_first_value(name, double(nval), current_section);
                 CHECK_AND_ASSERT_THROW_MES(h_array, " failed to insert values section entry");
               }
 
@@ -310,20 +310,20 @@ namespace epee
                     errno = 0;
                     int64_t nval = strtoll(val.data(), NULL, 10);
                     if (errno) throw std::runtime_error("Invalid number: " + std::string(val));
-                    insert_res = stg.insert_next_value(h_array, nval);
+                    insert_res = stg.insert_next_value(h_array, int64_t(nval));
                   }else
                   {
                     errno = 0;
                     uint64_t nval = strtoull(val.data(), NULL, 10);
                     if (errno) throw std::runtime_error("Invalid number: " + std::string(val));
-                    insert_res = stg.insert_next_value(h_array, nval);
+                    insert_res = stg.insert_next_value(h_array, uint64_t(nval));
                   }
                 }else
                 {
                   errno = 0;
                   double nval = strtod(val.data(), NULL);
                   if (errno) throw std::runtime_error("Invalid number: " + std::string(val));
-                  insert_res = stg.insert_next_value(h_array, nval);              
+                  insert_res = stg.insert_next_value(h_array, double(nval));
                 }
                 CHECK_AND_ASSERT_THROW_MES(insert_res, "Failed to insert next value");
                 state = match_state_array_after_value;
diff --git a/tests/unit_tests/net.cpp b/tests/unit_tests/net.cpp
index 262541bd2..221dc631d 100644
--- a/tests/unit_tests/net.cpp
+++ b/tests/unit_tests/net.cpp
@@ -271,7 +271,7 @@ TEST(tor_address, epee_serializev_v2)
         EXPECT_EQ(std::strlen(v2_onion), host.size());
 
         host.push_back('k');
-        EXPECT_TRUE(stg.set_value("host", host, stg.open_section("tor", nullptr, false)));
+        EXPECT_TRUE(stg.set_value("host", std::move(host), stg.open_section("tor", nullptr, false)));
         EXPECT_TRUE(command.load(stg)); // poor error reporting from `KV_SERIALIZE`
     }
 
@@ -322,7 +322,7 @@ TEST(tor_address, epee_serializev_v3)
         EXPECT_EQ(std::strlen(v3_onion), host.size());
 
         host.push_back('k');
-        EXPECT_TRUE(stg.set_value("host", host, stg.open_section("tor", nullptr, false)));
+        EXPECT_TRUE(stg.set_value("host", std::move(host), stg.open_section("tor", nullptr, false)));
         EXPECT_TRUE(command.load(stg)); // poor error reporting from `KV_SERIALIZE`
     }
 
@@ -373,7 +373,7 @@ TEST(tor_address, epee_serialize_unknown)
         EXPECT_EQ(std::strlen(net::tor_address::unknown_str()), host.size());
 
         host.push_back('k');
-        EXPECT_TRUE(stg.set_value("host", host, stg.open_section("tor", nullptr, false)));
+        EXPECT_TRUE(stg.set_value("host", std::move(host), stg.open_section("tor", nullptr, false)));
         EXPECT_TRUE(command.load(stg)); // poor error reporting from `KV_SERIALIZE`
     }