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Diffstat (limited to 'src/common/error_code.cc')
| -rw-r--r-- | src/common/error_code.cc | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/src/common/error_code.cc b/src/common/error_code.cc new file mode 100644 index 000000000..60086c550 --- /dev/null +++ b/src/common/error_code.cc @@ -0,0 +1,196 @@ +// -*- 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 |