mirror of
https://github.com/matrix-construct/construct
synced 2024-08-23 10:04:47 +02:00
148 lines
5.9 KiB
C++
148 lines
5.9 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_M_ERROR_H
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namespace ircd::m
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{
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struct error;
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}
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/// This hierarchy is designed to allow developers to throw an exception with
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/// matrix protocol specific information which has the potential to become a
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/// proper matrix JSON error object sent over HTTP to clients. Many exceptions
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/// aren't intended to reach clients, but just in case, those can utilize an
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/// http::INTERNAL_SERVER_ERROR. A regular IRCD_EXCEPTION won't be rooted in
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/// m::error; if thrown during a client's request and not first caught it
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/// may result in an internal server error sent to the client and may be
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/// further rethrown.
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///
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/// The IRCD_M_EXCEPTION macro is provided and should be used to declare the
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/// error type first rather than throwing an m::error directly if possible.
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///
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class ircd::m::error
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:public http::error
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{
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static thread_local char fmtbuf[4_KiB];
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IRCD_OVERLOAD(internal)
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error(internal_t, const http::code &, std::string object);
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protected:
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IRCD_OVERLOAD(child)
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template<class... args> error(child_t, args&&... a)
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:error{std::forward<args>(a)...}
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{}
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public:
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string_view errcode() const noexcept;
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string_view errstr() const noexcept;
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template<class... args> error(const http::code &, const string_view &errcode, const string_view &fmt, args&&...);
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template<class... args> error(const string_view &errcode, const string_view &fmt, args&&...);
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error(const http::code &, const json::object &object);
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error(const http::code &, const json::members &);
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error(const http::code &, const json::iov &);
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error(const http::code &);
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error(std::string);
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error();
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};
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/// Macro for all matrix exceptions; all errors rooted from m::error
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///
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/// Unfortunately we use another macro here instead of IRCD_EXCEPTION but what
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/// we gain is a more suitable exception hierarchy for the matrix protocol
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/// for fecundity of m::error, which is still the progeny of ircd::error. This
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/// macro takes 3 arguments:
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///
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/// - parent: A parent exception class type similar to the rest of ircd's
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/// system. For this macro, the parent can never be above m::error.
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///
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/// - name: The name of the exception is also what will be seen in the matrix
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/// protocol JSON's errcode. The matrix protocol error codes are UPPER_CASE and
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/// will appear as defined. This is also the name of this class itself too.
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///
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/// - httpcode: An HTTP code which will be used if this exception ever makes
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/// it out to a client.
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///
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#define IRCD_M_EXCEPTION(_parent_, _name_, _httpcode_) \
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struct _name_ \
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: _parent_ \
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{ \
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_name_() \
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: _parent_ \
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{ \
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child, _httpcode_, "M_"#_name_, "%s", http::status(_httpcode_) \
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}{} \
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\
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template<class... args> _name_(const string_view &fmt, args&&... a) \
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: _parent_ \
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{ \
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child, _httpcode_, "M_"#_name_, fmt, std::forward<args>(a)... \
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}{} \
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\
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template<class... args> _name_(child_t, args&&... a) \
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: _parent_ \
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{ \
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child, std::forward<args>(a)... \
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}{} \
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};
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// These are some common m::error, but not all of them; other declarations
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// may be dispersed throughout ircd::m.
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namespace ircd::m
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{
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IRCD_M_EXCEPTION(error, UNKNOWN, http::INTERNAL_SERVER_ERROR);
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IRCD_M_EXCEPTION(error, BAD_REQUEST, http::BAD_REQUEST);
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IRCD_M_EXCEPTION(error, BAD_JSON, http::BAD_REQUEST);
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IRCD_M_EXCEPTION(error, NOT_JSON, http::BAD_REQUEST);
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IRCD_M_EXCEPTION(error, BAD_SIGNATURE, http::UNAUTHORIZED);
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IRCD_M_EXCEPTION(error, ACCESS_DENIED, http::FORBIDDEN);
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IRCD_M_EXCEPTION(error, FORBIDDEN, http::FORBIDDEN);
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IRCD_M_EXCEPTION(error, NOT_FOUND, http::NOT_FOUND);
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IRCD_M_EXCEPTION(error, UNSUPPORTED, http::NOT_IMPLEMENTED);
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IRCD_M_EXCEPTION(error, NEED_MORE_PARAMS, http::MULTIPLE_CHOICES);
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IRCD_M_EXCEPTION(error, UNAVAILABLE, http::SERVICE_UNAVAILABLE);
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IRCD_M_EXCEPTION(error, BAD_PAGINATION, http::BAD_REQUEST);
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}
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template<class... args>
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ircd::m::error::error(const http::code &status,
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const string_view &errcode,
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const string_view &fmt,
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args&&... a)
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:error
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{
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internal, status, [&errcode, &fmt, &a...]() -> json::strung
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{
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const string_view str
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{
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fmt::sprintf{fmtbuf, fmt, std::forward<args>(a)...}
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};
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return json::members
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{
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{ "errcode", errcode },
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{ "error", str },
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};
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}()
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}{}
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template<class... args>
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ircd::m::error::error(const string_view &errcode,
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const string_view &fmt,
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args&&... a)
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:error
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{
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http::INTERNAL_SERVER_ERROR, errcode, fmt, std::forward<args>(a)...
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}
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{}
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