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.
99 lines
2.5 KiB
C++
99 lines
2.5 KiB
C++
/*
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* Copyright 2015 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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#include <seastar/core/print.hh>
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#include <seastar/rpc/rpc.hh>
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#include <seastar/util/log.hh>
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#include <seastar/util/backtrace.hh>
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#include <exception>
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#include <system_error>
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#include <atomic>
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#include "exceptions.hh"
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#include <iostream>
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bool check_exception(system_error_lambda_t f)
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{
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auto e = std::current_exception();
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if (!e) {
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return false;
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}
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try {
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std::rethrow_exception(e);
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} catch (std::system_error &e) {
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return f(e);
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} catch (...) {
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return false;
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}
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return false;
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}
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bool is_system_error_errno(int err_no)
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{
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return check_exception([err_no] (const std::system_error &e) {
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auto code = e.code();
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return code.value() == err_no &&
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code.category() == std::system_category();
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});
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}
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bool should_stop_on_system_error(const std::system_error& e) {
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if (e.code().category() == std::system_category()) {
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// Whitelist of errors that don't require us to stop the server:
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switch (e.code().value()) {
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case EEXIST:
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case ENOENT:
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return false;
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default:
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break;
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}
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}
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return true;
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}
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std::atomic<bool> abort_on_internal_error{false};
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void set_abort_on_internal_error(bool do_abort) {
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abort_on_internal_error.store(do_abort);
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}
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void on_internal_error(seastar::logger& logger, const seastar::sstring& msg) {
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if (abort_on_internal_error.load()) {
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logger.error("{}, at: {}", msg.c_str(), seastar::current_backtrace());
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abort();
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} else {
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seastar::throw_with_backtrace<std::runtime_error>(msg.c_str());
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}
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}
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bool is_timeout_exception(std::exception_ptr e) {
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try {
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std::rethrow_exception(e);
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} catch (seastar::rpc::timeout_error& unused) {
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return true;
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} catch (seastar::semaphore_timed_out& unused) {
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return true;
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} catch (...) {
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}
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return false;
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}
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