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monero/contrib/epee/include/storages/portable_storage.h
Lee Clagett 679d05567d Remove payload copy in all outgoing p2p messages
2021-01-19 02:22:32 +00:00

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// Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of the Andrey N. Sabelnikov nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
#pragma once
#include "portable_storage_base.h"
#include "portable_storage_val_converters.h"
#include "misc_log_ex.h"
#include "span.h"
namespace epee
{
class byte_slice;
class byte_stream;
namespace serialization
{
/************************************************************************/
/* */
/************************************************************************/
class portable_storage
{
public:
typedef epee::serialization::hsection hsection;
typedef epee::serialization::harray harray;
typedef storage_entry meta_entry;
struct limits_t
{
size_t n_objects;
size_t n_fields;
size_t n_strings; // not counting field names
};
portable_storage(){}
virtual ~portable_storage(){}
hsection open_section(const std::string& section_name, hsection hparent_section, bool create_if_notexist = false);
template<class t_value>
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, t_value&& target, hsection hparent_section);
//serial access for arrays of values --------------------------------------
//values
template<class t_value>
harray get_first_value(const std::string& value_name, t_value& target, hsection hparent_section);
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, t_value&& target, hsection hparent_section);
template<class t_value>
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);
harray insert_first_section(const std::string& pSectionName, hsection& hinserted_childsection, hsection hparent_section);
bool insert_next_section(harray hSecArray, hsection& hinserted_childsection);
//------------------------------------------------------------------------
//delete entry (section, value or array)
bool delete_entry(const std::string& pentry_name, hsection hparent_section = nullptr);
//-------------------------------------------------------------------------------
bool store_to_binary(byte_slice& target, std::size_t initial_buffer_size = 8192);
bool store_to_binary(byte_stream& ss);
bool load_from_binary(const epee::span<const uint8_t> target, const limits_t *limits = nullptr);
bool load_from_binary(const std::string& target, const limits_t *limits = nullptr)
{
return load_from_binary(epee::strspan<uint8_t>(target), limits);
}
template<class trace_policy>
bool dump_as_xml(std::string& targetObj, const std::string& root_name = "");
bool dump_as_json(std::string& targetObj, size_t indent = 0, bool insert_newlines = true);
bool load_from_json(const std::string& source);
private:
section m_root;
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, entry_type&& entry);
hsection insert_new_section(const std::string& pentry_name, hsection psection);
#pragma pack(push)
#pragma pack(1)
struct storage_block_header
{
uint32_t m_signature_a;
uint32_t m_signature_b;
uint8_t m_ver;
};
#pragma pack(pop)
};
template<class trace_policy>
bool portable_storage::dump_as_xml(std::string& targetObj, const std::string& root_name)
{
return false;//TODO: don't think i ever again will use xml - ambiguous and "overtagged" format
}
template<class to_type>
struct get_value_visitor: boost::static_visitor<void>
{
to_type& m_target;
get_value_visitor(to_type& target):m_target(target){}
template<class from_type>
void operator()(const from_type& v){convert_t(v, m_target);}
};
template<class t_value>
bool portable_storage::get_value(const std::string& value_name, t_value& val, hsection hparent_section)
{
BOOST_MPL_ASSERT(( boost::mpl::contains<storage_entry::types, t_value> ));
//TRY_ENTRY();
if(!hparent_section) hparent_section = &m_root;
storage_entry* pentry = find_storage_entry(value_name, hparent_section);
if(!pentry)
return false;
get_value_visitor<t_value> gvv(val);
boost::apply_visitor(gvv, *pentry);
return true;
//CATCH_ENTRY("portable_storage::template<>get_value", false);
}
//---------------------------------------------------------------------------------------------------------------
template<class t_value>
bool portable_storage::set_value(const std::string& value_name, t_value&& v, hsection hparent_section)
{
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, std::forward<t_value>(v));
if(!pentry)
return false;
return true;
}
*pentry = std::forward<t_value>(v);
return true;
CATCH_ENTRY("portable_storage::template<>set_value", false);
}
//---------------------------------------------------------------------------------------------------------------
template<class entry_type>
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);
CHECK_AND_ASSERT(!pentry_name.empty(), nullptr);
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);
}
//---------------------------------------------------------------------------------------------------------------
template<class to_type>
struct get_first_value_visitor: boost::static_visitor<bool>
{
to_type& m_target;
get_first_value_visitor(to_type& target):m_target(target){}
template<class from_type>
bool operator()(const array_entry_t<from_type>& a)
{
const from_type* pv = a.get_first_val();
if(!pv)
return false;
convert_t(*pv, m_target);
return true;
}
};
//---------------------------------------------------------------------------------------------------------------
template<class t_value>
harray portable_storage::get_first_value(const std::string& value_name, t_value& target, hsection hparent_section)
{
BOOST_MPL_ASSERT(( boost::mpl::contains<storage_entry::types, t_value> ));
//TRY_ENTRY();
if(!hparent_section) hparent_section = &m_root;
storage_entry* pentry = find_storage_entry(value_name, hparent_section);
if(!pentry)
return nullptr;
if(pentry->type() != typeid(array_entry))
return nullptr;
array_entry& ar_entry = boost::get<array_entry>(*pentry);
get_first_value_visitor<t_value> gfv(target);
if(!boost::apply_visitor(gfv, ar_entry))
return nullptr;
return &ar_entry;
//CATCH_ENTRY("portable_storage::get_first_value", nullptr);
}
//---------------------------------------------------------------------------------------------------------------
template<class to_type>
struct get_next_value_visitor: boost::static_visitor<bool>
{
to_type& m_target;
get_next_value_visitor(to_type& target):m_target(target){}
template<class from_type>
bool operator()(const array_entry_t<from_type>& a)
{
//TODO: optimize code here: work without get_next_val function
const from_type* pv = a.get_next_val();
if(!pv)
return false;
convert_t(*pv, m_target);
return true;
}
};
template<class t_value>
bool portable_storage::get_next_value(harray hval_array, t_value& target)
{
BOOST_MPL_ASSERT(( boost::mpl::contains<storage_entry::types, t_value> ));
//TRY_ENTRY();
CHECK_AND_ASSERT(hval_array, false);
array_entry& ar_entry = *hval_array;
get_next_value_visitor<t_value> gnv(target);
if(!boost::apply_visitor(gnv, ar_entry))
return false;
return true;
//CATCH_ENTRY("portable_storage::get_next_value", false);
}
//---------------------------------------------------------------------------------------------------------------
template<class t_value>
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_real_value>()));
if(!pentry)
return nullptr;
}
if(pentry->type() != typeid(array_entry))
*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_real_value>))
arr = array_entry(array_entry_t<t_real_value>());
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, 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_real_value>),
false, "unexpected type in insert_next_value: " << typeid(array_entry_t<t_real_value>).name());
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);
}
}
}
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