b3e01a45d7
This patch adds all functionality needed for Paxos protocol. The implementation does not strictly adhere to Paxos paper since the original paper allows setting a value only once, while for LWT we need to be able to make another Paxos round after "learn" phase completes, which requires things like repair to be introduced.
60 lines
1.8 KiB
C++
60 lines
1.8 KiB
C++
/*
|
|
* Copyright 2016 ScyllaDB
|
|
*/
|
|
|
|
/*
|
|
* This file is part of Scylla.
|
|
*
|
|
* Scylla is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Affero General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* Scylla is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <seastar/core/sstring.hh>
|
|
|
|
#include <functional>
|
|
#include <system_error>
|
|
|
|
namespace seastar { class logger; }
|
|
|
|
typedef std::function<bool (const std::system_error &)> system_error_lambda_t;
|
|
|
|
bool check_exception(system_error_lambda_t f);
|
|
bool is_system_error_errno(int err_no);
|
|
bool is_timeout_exception(std::exception_ptr e);
|
|
|
|
class storage_io_error : public std::exception {
|
|
private:
|
|
std::error_code _code;
|
|
std::string _what;
|
|
public:
|
|
storage_io_error(std::system_error& e) noexcept
|
|
: _code{e.code()}
|
|
, _what{std::string("Storage I/O error: ") + std::to_string(e.code().value()) + ": " + e.what()}
|
|
{ }
|
|
|
|
virtual const char* what() const noexcept override {
|
|
return _what.c_str();
|
|
}
|
|
|
|
const std::error_code& code() const { return _code; }
|
|
};
|
|
|
|
// Controls whether on_internal_error() aborts or throws.
|
|
void set_abort_on_internal_error(bool do_abort);
|
|
|
|
// Handles reporting of violation of internal invariants.
|
|
// Callers can assume that it does not return. May throw.
|
|
[[noreturn]] void on_internal_error(seastar::logger&, const seastar::sstring& reason);
|