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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2017 Red Hat, Inc. <contact@redhat.com>
*
* Author: Adam C. Emerson <aemerson@redhat.com>
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version
* 2.1, as published by the Free Software Foundation. See file
* COPYING.
*/
#include <exception>
#include "common/error_code.h"
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wnon-virtual-dtor"
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wnon-virtual-dtor"
using boost::system::error_category;
using boost::system::error_condition;
using boost::system::generic_category;
using boost::system::system_category;
namespace ceph {
// A category for error conditions particular to Ceph
class ceph_error_category : public converting_category {
public:
ceph_error_category(){}
const char* name() const noexcept override;
using converting_category::message;
std::string message(int ev) const override;
const char* message(int ev, char*, std::size_t) const noexcept override;
using converting_category::equivalent;
bool equivalent(const boost::system::error_code& c,
int ev) const noexcept override;
int from_code(int ev) const noexcept override;
};
const char* ceph_error_category::name() const noexcept {
return "ceph";
}
const char* ceph_error_category::message(int ev, char*,
std::size_t) const noexcept {
if (ev == 0)
return "No error";
switch (static_cast<errc>(ev)) {
case errc::not_in_map:
return "Map does not contain requested entry.";
case errc::does_not_exist:
return "Item does not exist";
case errc::failure:
return "An internal fault or inconsistency occurred";
case errc::exists:
return "Already exists";
case errc::limit_exceeded:
return "Attempt to use too much";
case errc::auth:
return "Authentication error";
case errc::conflict:
return "Conflict detected or precondition failed";
}
return "Unknown error.";
}
std::string ceph_error_category::message(int ev) const {
return message(ev, nullptr, 0);
}
bool ceph_error_category::equivalent(const boost::system::error_code& c,
int ev) const noexcept {
if (c.category() == system_category()) {
if (c.value() == boost::system::errc::no_such_file_or_directory) {
if (ev == static_cast<int>(errc::not_in_map) ||
ev == static_cast<int>(errc::does_not_exist)) {
// Blargh. A bunch of stuff returns ENOENT now, so just to be safe.
return true;
}
}
if (c.value() == boost::system::errc::io_error) {
if (ev == static_cast<int>(errc::failure)) {
return true;
}
}
if (c.value() == boost::system::errc::file_exists) {
if (ev == static_cast<int>(errc::exists)) {
return true;
}
}
if (c.value() == boost::system::errc::no_space_on_device ||
c.value() == boost::system::errc::invalid_argument) {
if (ev == static_cast<int>(errc::limit_exceeded)) {
return true;
}
}
if (c.value() == boost::system::errc::operation_not_permitted) {
if (ev == static_cast<int>(ceph::errc::conflict)) {
return true;
}
}
}
return false;
}
int ceph_error_category::from_code(int ev) const noexcept {
if (ev == 0)
return 0;
switch (static_cast<errc>(ev)) {
case errc::not_in_map:
case errc::does_not_exist:
// What we use now.
return -ENOENT;
case errc::failure:
return -EIO;
case errc::exists:
return -EEXIST;
case errc::limit_exceeded:
return -EIO;
case errc::auth:
return -EACCES;
case errc::conflict:
return -EINVAL;
}
return -EDOM;
}
const error_category& ceph_category() noexcept {
static const ceph_error_category c;
return c;
}
// This is part of the glue for hooking new code to old. Since
// Context* and other things give us integer codes from errno, wrap
// them in an error_code.
[[nodiscard]] boost::system::error_code to_error_code(int ret) noexcept
{
if (ret == 0)
return {};
return { std::abs(ret), boost::system::system_category() };
}
// This is more complicated. For the case of categories defined
// elsewhere, we have to convert everything here.
[[nodiscard]] int from_error_code(boost::system::error_code e) noexcept
{
if (!e)
return 0;
auto c = dynamic_cast<const converting_category*>(&e.category());
// For categories we define
if (c)
return c->from_code(e.value());
// For categories matching values of errno
if (e.category() == boost::system::system_category() ||
e.category() == boost::system::generic_category() ||
// ASIO uses the system category for these and matches system
// error values.
e.category() == boost::asio::error::get_netdb_category() ||
e.category() == boost::asio::error::get_addrinfo_category())
return -e.value();
if (e.category() == boost::asio::error::get_misc_category()) {
// These values are specific to asio
switch (e.value()) {
case boost::asio::error::already_open:
return -EIO;
case boost::asio::error::eof:
return -EIO;
case boost::asio::error::not_found:
return -ENOENT;
case boost::asio::error::fd_set_failure:
return -EINVAL;
}
}
// Add any other categories we use here.
// Marcus likes this as a sentinel for 'Error code? What error code?'
return -EDOM;
}
}
#pragma GCC diagnostic pop
#pragma clang diagnostic pop
|
