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1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
2 | // vim: ts=8 sw=2 smarttab | |
3 | /* | |
4 | * Ceph - scalable distributed file system | |
5 | * | |
6 | * Copyright (C) 2017 Red Hat, Inc. <contact@redhat.com> | |
7 | * | |
8 | * Author: Adam C. Emerson <aemerson@redhat.com> | |
9 | * | |
10 | * This is free software; you can redistribute it and/or modify it | |
11 | * under the terms of the GNU Lesser General Public License version | |
12 | * 2.1, as published by the Free Software Foundation. See file | |
13 | * COPYING. | |
14 | */ | |
15 | ||
16 | #include <exception> | |
17 | ||
18 | #include "common/error_code.h" | |
19 | ||
20 | #pragma GCC diagnostic push | |
21 | #pragma GCC diagnostic ignored "-Wnon-virtual-dtor" | |
22 | #pragma clang diagnostic push | |
23 | #pragma clang diagnostic ignored "-Wnon-virtual-dtor" | |
24 | ||
25 | using boost::system::error_category; | |
26 | using boost::system::error_condition; | |
27 | using boost::system::generic_category; | |
28 | using boost::system::system_category; | |
29 | ||
30 | namespace ceph { | |
31 | ||
32 | // A category for error conditions particular to Ceph | |
33 | ||
34 | class ceph_error_category : public converting_category { | |
35 | public: | |
36 | ceph_error_category(){} | |
37 | const char* name() const noexcept override; | |
38 | using converting_category::message; | |
39 | std::string message(int ev) const override; | |
40 | const char* message(int ev, char*, std::size_t) const noexcept override; | |
41 | using converting_category::equivalent; | |
42 | bool equivalent(const boost::system::error_code& c, | |
43 | int ev) const noexcept override; | |
44 | int from_code(int ev) const noexcept override; | |
45 | }; | |
46 | ||
47 | const char* ceph_error_category::name() const noexcept { | |
48 | return "ceph"; | |
49 | } | |
50 | ||
51 | const char* ceph_error_category::message(int ev, char*, | |
52 | std::size_t) const noexcept { | |
53 | if (ev == 0) | |
54 | return "No error"; | |
55 | ||
56 | switch (static_cast<errc>(ev)) { | |
57 | ||
58 | case errc::not_in_map: | |
59 | return "Map does not contain requested entry."; | |
60 | case errc::does_not_exist: | |
61 | return "Item does not exist"; | |
62 | case errc::failure: | |
63 | return "An internal fault or inconsistency occurred"; | |
64 | case errc::exists: | |
65 | return "Already exists"; | |
66 | case errc::limit_exceeded: | |
67 | return "Attempt to use too much"; | |
68 | case errc::auth: | |
69 | return "Authentication error"; | |
70 | case errc::conflict: | |
71 | return "Conflict detected or precondition failed"; | |
72 | } | |
73 | ||
74 | return "Unknown error."; | |
75 | } | |
76 | ||
77 | std::string ceph_error_category::message(int ev) const { | |
78 | return message(ev, nullptr, 0); | |
79 | } | |
80 | ||
81 | bool ceph_error_category::equivalent(const boost::system::error_code& c, | |
82 | int ev) const noexcept { | |
83 | if (c.category() == system_category()) { | |
84 | if (c.value() == boost::system::errc::no_such_file_or_directory) { | |
85 | if (ev == static_cast<int>(errc::not_in_map) || | |
86 | ev == static_cast<int>(errc::does_not_exist)) { | |
87 | // Blargh. A bunch of stuff returns ENOENT now, so just to be safe. | |
88 | return true; | |
89 | } | |
90 | } | |
91 | if (c.value() == boost::system::errc::io_error) { | |
92 | if (ev == static_cast<int>(errc::failure)) { | |
93 | return true; | |
94 | } | |
95 | } | |
96 | if (c.value() == boost::system::errc::file_exists) { | |
97 | if (ev == static_cast<int>(errc::exists)) { | |
98 | return true; | |
99 | } | |
100 | } | |
101 | if (c.value() == boost::system::errc::no_space_on_device || | |
102 | c.value() == boost::system::errc::invalid_argument) { | |
103 | if (ev == static_cast<int>(errc::limit_exceeded)) { | |
104 | return true; | |
105 | } | |
106 | } | |
107 | if (c.value() == boost::system::errc::operation_not_permitted) { | |
108 | if (ev == static_cast<int>(ceph::errc::conflict)) { | |
109 | return true; | |
110 | } | |
111 | } | |
112 | } | |
113 | return false; | |
114 | } | |
115 | ||
116 | int ceph_error_category::from_code(int ev) const noexcept { | |
117 | if (ev == 0) | |
118 | return 0; | |
119 | ||
120 | switch (static_cast<errc>(ev)) { | |
121 | case errc::not_in_map: | |
122 | case errc::does_not_exist: | |
123 | // What we use now. | |
124 | return -ENOENT; | |
125 | case errc::failure: | |
126 | return -EIO; | |
127 | case errc::exists: | |
128 | return -EEXIST; | |
129 | case errc::limit_exceeded: | |
130 | return -EIO; | |
131 | case errc::auth: | |
132 | return -EACCES; | |
133 | case errc::conflict: | |
134 | return -EINVAL; | |
135 | } | |
136 | return -EDOM; | |
137 | } | |
138 | ||
139 | const error_category& ceph_category() noexcept { | |
140 | static const ceph_error_category c; | |
141 | return c; | |
142 | } | |
143 | ||
144 | ||
145 | // This is part of the glue for hooking new code to old. Since | |
146 | // Context* and other things give us integer codes from errno, wrap | |
147 | // them in an error_code. | |
148 | [[nodiscard]] boost::system::error_code to_error_code(int ret) noexcept | |
149 | { | |
150 | if (ret == 0) | |
151 | return {}; | |
152 | return { std::abs(ret), boost::system::system_category() }; | |
153 | } | |
154 | ||
155 | // This is more complicated. For the case of categories defined | |
156 | // elsewhere, we have to convert everything here. | |
157 | [[nodiscard]] int from_error_code(boost::system::error_code e) noexcept | |
158 | { | |
159 | if (!e) | |
160 | return 0; | |
161 | ||
162 | auto c = dynamic_cast<const converting_category*>(&e.category()); | |
163 | // For categories we define | |
164 | if (c) | |
165 | return c->from_code(e.value()); | |
166 | ||
167 | // For categories matching values of errno | |
168 | if (e.category() == boost::system::system_category() || | |
169 | e.category() == boost::system::generic_category() || | |
170 | // ASIO uses the system category for these and matches system | |
171 | // error values. | |
172 | e.category() == boost::asio::error::get_netdb_category() || | |
173 | e.category() == boost::asio::error::get_addrinfo_category()) | |
174 | return -e.value(); | |
175 | ||
176 | if (e.category() == boost::asio::error::get_misc_category()) { | |
177 | // These values are specific to asio | |
178 | switch (e.value()) { | |
179 | case boost::asio::error::already_open: | |
180 | return -EIO; | |
181 | case boost::asio::error::eof: | |
182 | return -EIO; | |
183 | case boost::asio::error::not_found: | |
184 | return -ENOENT; | |
185 | case boost::asio::error::fd_set_failure: | |
186 | return -EINVAL; | |
187 | } | |
188 | } | |
189 | // Add any other categories we use here. | |
190 | ||
191 | // Marcus likes this as a sentinel for 'Error code? What error code?' | |
192 | return -EDOM; | |
193 | } | |
194 | } | |
195 | #pragma GCC diagnostic pop | |
196 | #pragma clang diagnostic pop |