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/**
* Copyright (C) 2023-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/db/query/query_shape/find_cmd_shape.h"
#include "mongo/db/query/projection_ast_util.h"
#include "mongo/db/query/query_shape/shape_helpers.h"
namespace mongo::query_shape {
namespace {
BSONObj projectionShape(const boost::optional<projection_ast::Projection>& proj,
const SerializationOptions& opts =
SerializationOptions::kRepresentativeQueryShapeSerializeOptions) {
return proj ? projection_ast::serialize(*proj->root(), opts) : BSONObj();
}
BSONObj sortShape(const boost::optional<SortPattern>& sort,
const SerializationOptions& opts =
SerializationOptions::kRepresentativeQueryShapeSerializeOptions) {
return sort
? sort->serialize(SortPattern::SortKeySerialization::kForPipelineSerialization, opts)
.toBson()
: BSONObj();
}
void maybeAddWithName(const OptionalBool& optBool, BSONObjBuilder& bob, StringData name) {
if (optBool.has_value()) {
bob.append(name, bool(optBool));
}
}
void addRemainingFindCommandFields(const FindCmdShapeComponents& components, BSONObjBuilder& bob) {
maybeAddWithName(components.singleBatch, bob, FindCommandRequest::kSingleBatchFieldName);
maybeAddWithName(components.allowDiskUse, bob, FindCommandRequest::kAllowDiskUseFieldName);
maybeAddWithName(components.returnKey, bob, FindCommandRequest::kReturnKeyFieldName);
maybeAddWithName(components.showRecordId, bob, FindCommandRequest::kShowRecordIdFieldName);
maybeAddWithName(components.tailable, bob, FindCommandRequest::kTailableFieldName);
maybeAddWithName(components.awaitData, bob, FindCommandRequest::kAwaitDataFieldName);
maybeAddWithName(components.oplogReplay, bob, FindCommandRequest::kOplogReplayFieldName);
}
} // namespace
FindCmdShapeComponents::FindCmdShapeComponents(
const ParsedFindCommand& request,
const boost::intrusive_ptr<ExpressionContext>& expCtx,
const SerializationOptions& opts)
: filter(request.filter->serialize(opts)),
projection(projectionShape(request.proj, opts)),
sort(sortShape(request.sort, opts)),
min(shape_helpers::extractMinOrMaxShape(request.findCommandRequest->getMin(), opts)),
max(shape_helpers::extractMinOrMaxShape(request.findCommandRequest->getMax(), opts)),
singleBatch(request.findCommandRequest->getSingleBatch()),
allowDiskUse(request.findCommandRequest->getAllowDiskUse().has_value()
? boost::optional<bool>(bool(request.findCommandRequest->getAllowDiskUse()))
: boost::none),
returnKey(request.findCommandRequest->getReturnKey()),
showRecordId(request.findCommandRequest->getShowRecordId()),
tailable(request.findCommandRequest->getTailable()),
awaitData(request.findCommandRequest->getAwaitData()),
oplogReplay(request.findCommandRequest->getOplogReplay()),
hasField(),
serializationOpts(opts) {
hasField.projection = request.proj.has_value();
hasField.sort = request.sort.has_value();
hasField.limit = request.findCommandRequest->getLimit().has_value();
hasField.skip = request.findCommandRequest->getSkip().has_value();
}
void FindCmdShapeComponents::appendTo(BSONObjBuilder& bob) const {
bob.append("command", "find");
std::unique_ptr<MatchExpression> filterExpr;
// Filter.
bob.append(FindCommandRequest::kFilterFieldName, filter);
if (hasField.projection) {
bob.append(FindCommandRequest::kProjectionFieldName, projection);
}
if (!max.isEmpty()) {
bob.append(FindCommandRequest::kMaxFieldName, max);
}
if (!min.isEmpty()) {
bob.append(FindCommandRequest::kMinFieldName, min);
}
// Sort.
if (hasField.sort) {
bob.append(FindCommandRequest::kSortFieldName, sort);
}
// The values here don't matter (assuming we're not using the 'kUnchanged' policy).
tassert(7973601,
"Serialization policy not supported - original values have been discarded",
serializationOpts.literalPolicy != LiteralSerializationPolicy::kUnchanged);
if (hasField.limit) {
serializationOpts.appendLiteral(&bob, FindCommandRequest::kLimitFieldName, 1ll);
}
if (hasField.skip) {
serializationOpts.appendLiteral(&bob, FindCommandRequest::kSkipFieldName, 1ll);
}
// Add the fields that require no transformation.
addRemainingFindCommandFields(*this, bob);
}
void FindCmdShapeComponents::HashValue(absl::HashState state) const {
absl::HashState::combine(std::move(state),
simpleHash(filter),
simpleHash(projection),
simpleHash(sort),
simpleHash(min),
simpleHash(max),
singleBatch,
allowDiskUse,
returnKey,
showRecordId,
tailable,
awaitData,
oplogReplay,
hasField);
}
std::unique_ptr<FindCommandRequest> FindCmdShape::toFindCommandRequest() const {
auto fcr = std::make_unique<FindCommandRequest>(nssOrUUID);
fcr->setFilter(components.filter);
if (components.hasField.projection)
fcr->setProjection(components.projection);
if (components.hasField.sort)
fcr->setSort(components.sort);
fcr->setMin(components.min);
fcr->setMax(components.max);
// Doesn't matter what value to use for limit and skip in the context of a shape.
if (components.hasField.limit)
fcr->setLimit(1ll);
if (components.hasField.skip)
fcr->setSkip(1ll);
// All the booleans.
if (components.singleBatch.has_value())
fcr->setSingleBatch(bool(components.singleBatch));
if (components.allowDiskUse.has_value())
fcr->setAllowDiskUse(bool(components.allowDiskUse));
if (components.returnKey.has_value())
fcr->setReturnKey(bool(components.returnKey));
if (components.showRecordId.has_value())
fcr->setShowRecordId(bool(components.showRecordId));
if (components.tailable.has_value())
fcr->setTailable(bool(components.tailable));
if (components.awaitData.has_value())
fcr->setAwaitData(bool(components.awaitData));
if (components.oplogReplay.has_value())
fcr->setOplogReplay(bool(components.oplogReplay));
// Common shape components.
if (_let.hasLet)
fcr->setLet(_let.shapifiedLet);
if (!collation.isEmpty())
fcr->setCollation(collation);
return fcr;
}
FindCmdShape::FindCmdShape(const ParsedFindCommand& findRequest,
const boost::intrusive_ptr<ExpressionContext>& expCtx)
: CmdWithLetShape(findRequest.findCommandRequest->getLet(),
expCtx,
components,
findRequest.findCommandRequest->getNamespaceOrUUID(),
findRequest.findCommandRequest->getCollation()),
components(findRequest, expCtx) {}
void FindCmdShape::appendLetCmdSpecificShapeComponents(
BSONObjBuilder& bob,
const boost::intrusive_ptr<ExpressionContext>& expCtx,
const SerializationOptions& opts) const {
if (opts == SerializationOptions::kRepresentativeQueryShapeSerializeOptions) {
// Fast path: we already have this.
return components.appendTo(bob);
} else {
// Slow path: we need to re-parse from our representative shapes.
auto request = uassertStatusOKWithContext(
parsed_find_command::parse(expCtx,
toFindCommandRequest(),
ExtensionsCallbackNoop(),
MatchExpressionParser::kAllowAllSpecialFeatures),
"Could not re-parse a representative query shape");
// This constructor will shapify according to the options.
FindCmdShapeComponents{*request, expCtx, opts}.appendTo(bob);
}
}
} // namespace mongo::query_shape
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