103 lines
4.0 KiB
C++
103 lines
4.0 KiB
C++
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* Copyright (C) 2017 ScyllaDB
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*
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* Modified by 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 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 "cql3/statements/index_target.hh"
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#include <boost/algorithm/string/predicate.hpp>
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#include <regex>
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namespace secondary_index {
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struct target_parser {
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static std::pair<const column_definition*, cql3::statements::index_target::target_type>
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parse(schema_ptr schema, const index_metadata& im)
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{
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sstring target = im.options().at(cql3::statements::index_target::target_option_name);
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auto result = parse(schema, target);
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if (!result) {
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throw exceptions::configuration_exception(sprint("Unable to parse targets for index %s (%s)", im.name(), target));
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}
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return *result;
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}
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static stdx::optional<std::pair<const column_definition*, cql3::statements::index_target::target_type>>
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parse(schema_ptr schema, const sstring& target)
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{
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using namespace cql3::statements;
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// if the regex matches then the target is in the form "keys(foo)", "entries(bar)" etc
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// if not, then it must be a simple column name and implictly its type is VALUES
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sstring column_name;
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index_target::target_type target_type;
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static const std::regex target_regex("^(keys|entries|values|full)\\((.+)\\)$");
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std::cmatch match;
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if (std::regex_match(target.data(), match, target_regex)) {
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target_type = index_target::from_sstring(match[1].str());
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column_name = match[2].str();
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} else {
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column_name = target;
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target_type = index_target::target_type::values;
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}
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// in the case of a quoted column name the name in the target string
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// will be enclosed in quotes, which we need to unwrap. It may also
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// include quote characters internally, escaped like so:
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// abc"def -> abc""def.
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// Because the target string is stored in a CQL compatible form, we
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// need to un-escape any such quotes to get the actual column name
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static const sstring quote{"\""};
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if (boost::starts_with(target, quote)) {
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column_name = column_name.substr(1, column_name.length()-2);
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static const std::regex two_quotes("\"\"");
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column_name = std::regex_replace(std::string{column_name}, two_quotes, std::string{quote});
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}
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auto column = schema->get_column_definition(utf8_type->decompose(column_name));
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if (!column) {
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return stdx::nullopt;
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}
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return std::make_pair(column, target_type);
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}
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};
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}
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