mirror of
https://github.com/triqs/dft_tools
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96 lines
3.5 KiB
C++
96 lines
3.5 KiB
C++
/*******************************************************************************
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*
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* TRIQS: a Toolbox for Research in Interacting Quantum Systems
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*
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* Copyright (C) 2012 by M. Ferrero, O. Parcollet
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*
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* TRIQS is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* TRIQS is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* TRIQS. If not, see <http://www.gnu.org/licenses/>.
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*
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******************************************************************************/
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#ifndef TRIQS_UTILITY_CRASH_LOGGER_H
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#define TRIQS_UTILITY_CRASH_LOGGER_H
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#include "./first_include.hpp"
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#include <string>
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#include <exception>
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#include <stdexcept>
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#include <functional>
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#include <vector>
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#include <iostream>
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#include "./typeid_name.hpp"
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#include "./scope_guard.hpp"
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#include "../h5.hpp"
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namespace triqs { namespace utility {
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/**
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* Usage :
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*
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* Suppose we have objects a,b,c ... which are all H5_Serializable
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* Then :
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* { // a scope, whatever
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* auto log = crash_logger("dump.h5");
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* log(a,"a")(b,"b")(c,"c"); // <---- pls make a macro here !
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* // ... do some work
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* log.dismiss();
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* }
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*
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* Now : if the calculation proceeds correctly, nothing happens. log is destroyed.
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* if however the calculation does not reach the dismiss, e.g. an exception occurs
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* then log is destroyed without a dismiss and it will dump all objects in the hdf5 file.
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*
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* "some work" can be as complex as needed...
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*
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*/
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class crash_logger {
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std::string filename_;
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std::vector<scope_guard<std::function<void()>>> guards;
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std::vector<std::string> names;
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public :
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///
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crash_logger(std::string filename) : filename_(filename){}
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crash_logger(const crash_logger&) = delete;
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crash_logger(crash_logger&&) = default;
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crash_logger& operator=(const crash_logger&) = delete;
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crash_logger& operator=(crash_logger && x) { using std::swap; swap(guards, x.guards); swap(names,x.names); return *this;}
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///
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template<typename Obj> crash_logger & operator()(Obj const & obj, std::string name) {
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names.push_back(name);
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guards.emplace_back([&obj,this, name](){
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using triqs::h5::h5_write; // to have the proper overload for scalar type !!
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try { h5_write( h5::group(H5::H5File(this->filename_.c_str(),H5F_ACC_RDWR)), name, obj); }
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catch(H5::Exception const & e) { std::cerr << "An hdf5 exception has occurred in crash_logger : I can not recover : error is " <<std::endl ; e.printError();}
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catch(...) { std::cerr << "An exception has occurred in crash_logger for an object of type " << typeid_name(obj) << " named " << name<< std::endl ; }
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}); //end lambda
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return *this;
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}
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///
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~crash_logger() {
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try {
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if ((guards.size()>0) && (guards.front().active())) {
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std::cerr << "crash_logger : I am destroyed without being dismissed. Dumping the objects : ";
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for (auto & x : names) std::cerr<< "\""<< x <<"\" ";
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std::cerr<< std::endl;
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H5::H5File(this->filename_.c_str(),H5F_ACC_TRUNC); // create the file
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}
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}
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catch(...) {} // just in case ... destructor can not throw
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}
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///
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void dismiss() {for (auto & g : guards) g.dismiss();}
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};
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}}
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#endif
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