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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include <boost/intrusive_ptr.hpp>
#include <string>
#include "mongo/db/pipeline/accumulation_statement.h"
#include "mongo/db/commands/feature_compatibility_version_documentation.h"
#include "mongo/db/exec/document_value/value.h"
#include "mongo/db/pipeline/accumulator.h"
#include "mongo/db/query/allowed_contexts.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/str.h"
#include "mongo/util/string_map.h"
namespace mongo {
using std::string;
namespace {
// Used to keep track of which Accumulators are registered under which name and in which contexts
// they can be used in.
static StringMap<AccumulationStatement::ParserRegistration> parserMap;
} // namespace
void AccumulationStatement::registerAccumulator(
std::string name,
AccumulationStatement::Parser parser,
AllowedWithApiStrict allowedWithApiStrict,
AllowedWithClientType allowedWithClientType,
boost::optional<multiversion::FeatureCompatibilityVersion> requiredMinVersion) {
auto it = parserMap.find(name);
massert(28722,
str::stream() << "Duplicate accumulator (" << name << ") registered.",
it == parserMap.end());
parserMap[name] = {parser, allowedWithApiStrict, allowedWithClientType, requiredMinVersion};
}
AccumulationStatement::ParserRegistration& AccumulationStatement::getParser(StringData name) {
auto it = parserMap.find(name);
uassert(
15952, str::stream() << "unknown group operator '" << name << "'", it != parserMap.end());
return it->second;
}
boost::intrusive_ptr<AccumulatorState> AccumulationStatement::makeAccumulator() const {
return expr.factory();
}
AccumulationStatement AccumulationStatement::parseAccumulationStatement(
ExpressionContext* const expCtx, const BSONElement& elem, const VariablesParseState& vps) {
auto fieldName = elem.fieldNameStringData();
uassert(40234,
str::stream() << "The field '" << fieldName << "' must be an accumulator object",
elem.type() == BSONType::Object &&
elem.embeddedObject().firstElementFieldName()[0] == '$');
uassert(40235,
str::stream() << "The field name '" << fieldName << "' cannot contain '.'",
fieldName.find('.') == string::npos);
uassert(40236,
str::stream() << "The field name '" << fieldName << "' cannot be an operator name",
fieldName[0] != '$');
uassert(40238,
str::stream() << "The field '" << fieldName << "' must specify one accumulator",
elem.Obj().nFields() == 1);
auto specElem = elem.Obj().firstElement();
auto accName = specElem.fieldNameStringData();
uassert(40237,
str::stream() << "The " << accName << " accumulator is a unary operator",
specElem.type() != BSONType::Array);
auto&& [parser, allowedWithApiStrict, allowedWithClientType, requiredMinVersion] =
AccumulationStatement::getParser(accName);
auto allowedMaxVersion = expCtx->maxFeatureCompatibilityVersion;
uassert(ErrorCodes::QueryFeatureNotAllowed,
// We would like to include the current version and the required minimum version in this
// error message, but using FeatureCompatibilityVersion::toString() would introduce a
// dependency cycle (see SERVER-31968).
str::stream() << accName
<< " is not allowed in the current feature compatibility version. See "
<< feature_compatibility_version_documentation::kCompatibilityLink
<< " for more information.",
!requiredMinVersion || !allowedMaxVersion || *requiredMinVersion <= *allowedMaxVersion);
tassert(5837900, "Accumulators should only appear in a user operation", expCtx->opCtx);
assertLanguageFeatureIsAllowed(
expCtx->opCtx, accName.toString(), allowedWithApiStrict, allowedWithClientType);
auto accExpr = parser(expCtx, specElem, vps);
return AccumulationStatement(fieldName.toString(), std::move(accExpr));
}
MONGO_INITIALIZER_GROUP(BeginAccumulatorRegistration, ("default"), ("EndAccumulatorRegistration"))
MONGO_INITIALIZER_GROUP(EndAccumulatorRegistration, ("BeginAccumulatorRegistration"), ())
} // namespace mongo
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