ebaeefa02b
- introcduced "seastarx.hh" header, which does a "using namespace seastar"; - 'net' namespace conflicts with seastar::net, renamed to 'netw'. - 'transport' namespace conflicts with seastar::transport, renamed to cql_transport. - "logger" global variables now conflict with logger global type, renamed to xlogger. - other minor changes
103 lines
3.7 KiB
C++
103 lines
3.7 KiB
C++
/*
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* Copyright 2016 ScyllaDB
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**/
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/* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <boost/signals2.hpp>
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#include <boost/signals2/dummy_mutex.hpp>
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#include <type_traits>
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#include "utils/exceptions.hh"
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#include <core/future.hh>
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#include "seastarx.hh"
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namespace bs2 = boost::signals2;
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using disk_error_signal_type = bs2::signal_type<void (), bs2::keywords::mutex_type<bs2::dummy_mutex>>::type;
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extern thread_local disk_error_signal_type commit_error;
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extern thread_local disk_error_signal_type sstable_read_error;
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extern thread_local disk_error_signal_type sstable_write_error;
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extern thread_local disk_error_signal_type general_disk_error;
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bool should_stop_on_system_error(const std::system_error& e);
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using io_error_handler = std::function<void (std::exception_ptr)>;
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// stores a function that generates a io handler for a given signal.
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using io_error_handler_gen = std::function<io_error_handler (disk_error_signal_type&)>;
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io_error_handler default_io_error_handler(disk_error_signal_type& signal);
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// generates handler that handles exception for a given signal
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io_error_handler_gen default_io_error_handler_gen();
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extern thread_local io_error_handler commit_error_handler;
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extern thread_local io_error_handler sstable_write_error_handler;
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extern thread_local io_error_handler general_disk_error_handler;
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template<typename Func, typename... Args>
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std::enable_if_t<!is_future<std::result_of_t<Func(Args&&...)>>::value,
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std::result_of_t<Func(Args&&...)>>
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do_io_check(const io_error_handler& error_handler, Func&& func, Args&&... args) {
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try {
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// calling function
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return func(std::forward<Args>(args)...);
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} catch (...) {
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error_handler(std::current_exception());
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throw;
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}
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}
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template<typename Func, typename... Args,
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typename RetType = typename std::enable_if<is_future<std::result_of_t<Func(Args&&...)>>::value>::type>
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auto do_io_check(const io_error_handler& error_handler, Func&& func, Args&&... args) {
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try {
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// calling function
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auto fut = func(std::forward<Args>(args)...);
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return fut.handle_exception([&] (auto ep) {
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error_handler(ep);
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return futurize<std::result_of_t<Func(Args&&...)>>::make_exception_future(ep);
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});
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} catch (...) {
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error_handler(std::current_exception());
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throw;
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}
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}
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template<typename Func, typename... Args>
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auto commit_io_check(Func&& func, Args&&... args) {
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return do_io_check(commit_error_handler, func, std::forward<Args>(args)...);
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}
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template<typename Func, typename... Args>
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auto sstable_io_check(const io_error_handler& error_handler, Func&& func, Args&&... args) {
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return do_io_check(error_handler, func, std::forward<Args>(args)...);
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}
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template<typename Func, typename... Args>
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auto io_check(const io_error_handler& error_handler, Func&& func, Args&&... args) {
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return do_io_check(error_handler, general_disk_error, func, std::forward<Args>(args)...);
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}
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template<typename Func, typename... Args>
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auto io_check(Func&& func, Args&&... args) {
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return do_io_check(general_disk_error_handler, func, std::forward<Args>(args)...);
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}
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