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https://github.com/scylladb/scylladb.git
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8a7b24dea1
Add types exception overloads for ValidationException, ResourceNotFoundException, etc, to avoid writing explicit error type as string everywhere (with the potential for spelling errors ever present). Also allows intellisense etc to complete the exception when coded.
78 lines
2.6 KiB
C++
78 lines
2.6 KiB
C++
/*
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* Copyright 2019 ScyllaDB
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*/
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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 Affero 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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#pragma once
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#include <seastar/http/httpd.hh>
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#include "seastarx.hh"
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namespace alternator {
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namespace detail {
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enum class exception_type {
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ValidationException,
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ResourceNotFoundException,
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AccessDeniedException,
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InvalidSignatureException,
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};
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std::ostream& operator<<(std::ostream&, exception_type);
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}
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// DynamoDB's error messages are described in detail in
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// https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Programming.Errors.html
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// Ah An error message has a "type", e.g., "ResourceNotFoundException", a coarser
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// HTTP code (almost always, 400), and a human readable message. Eventually these
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// will be wrapped into a JSON object returned to the client.
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class api_error : public std::exception {
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public:
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using status_type = httpd::reply::status_type;
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status_type _http_code;
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std::string _type;
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std::string _msg;
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api_error(std::string type, std::string msg, status_type http_code = status_type::bad_request)
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: _http_code(std::move(http_code))
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, _type(std::move(type))
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, _msg(std::move(msg))
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{ }
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api_error() = default;
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virtual const char* what() const noexcept override { return _msg.c_str(); }
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protected:
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api_error(detail::exception_type, std::string msg, status_type http_code);
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};
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namespace detail {
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template<detail::exception_type Type>
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class t_api_error : public api_error {
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public:
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t_api_error(std::string msg, status_type http_code = status_type::bad_request)
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: api_error(Type, std::move(msg), http_code)
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{}
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};
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}
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using validation_exception = detail::t_api_error<detail::exception_type::ValidationException>;
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using resource_not_found_exception = detail::t_api_error<detail::exception_type::ResourceNotFoundException>;
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using access_denied_exception = detail::t_api_error<detail::exception_type::AccessDeniedException>;
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using invalid_signature_exception = detail::t_api_error<detail::exception_type::InvalidSignatureException>;
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}
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