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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 "mongo/db/views/resolved_view.h"
#include "mongo/base/init.h"
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/db/pipeline/document_source_index_stats.h"
#include "mongo/db/pipeline/document_source_internal_convert_bucket_index_stats.h"
#include "mongo/db/pipeline/document_source_internal_unpack_bucket.h"
#include "mongo/db/timeseries/timeseries_field_names.h"
#include "mongo/rpc/get_status_from_command_result.h"
namespace mongo {
MONGO_INIT_REGISTER_ERROR_EXTRA_INFO(ResolvedView);
ResolvedView ResolvedView::fromBSON(const BSONObj& commandResponseObj) {
uassert(40248,
"command response expected to have a 'resolvedView' field",
commandResponseObj.hasField("resolvedView"));
auto viewDef = commandResponseObj.getObjectField("resolvedView");
uassert(40249, "resolvedView must be an object", !viewDef.isEmpty());
uassert(40250,
"View definition must have 'ns' field of type string",
viewDef.hasField("ns") && viewDef.getField("ns").type() == BSONType::String);
uassert(40251,
"View definition must have 'pipeline' field of type array",
viewDef.hasField("pipeline") && viewDef.getField("pipeline").type() == BSONType::Array);
std::vector<BSONObj> pipeline;
for (auto&& item : viewDef["pipeline"].Obj()) {
pipeline.push_back(item.Obj().getOwned());
}
BSONObj collationSpec;
if (auto collationElt = viewDef["collation"]) {
uassert(40639,
"View definition 'collation' field must be an object",
collationElt.type() == BSONType::Object);
collationSpec = collationElt.embeddedObject().getOwned();
}
return {NamespaceString(viewDef["ns"].valueStringData()),
std::move(pipeline),
std::move(collationSpec)};
}
void ResolvedView::serialize(BSONObjBuilder* builder) const {
BSONObjBuilder subObj(builder->subobjStart("resolvedView"));
subObj.append("ns", _namespace.ns());
subObj.append("pipeline", _pipeline);
if (!_defaultCollation.isEmpty()) {
subObj.append("collation", _defaultCollation);
}
}
std::shared_ptr<const ErrorExtraInfo> ResolvedView::parse(const BSONObj& cmdReply) {
return std::make_shared<ResolvedView>(fromBSON(cmdReply));
}
AggregateCommandRequest ResolvedView::asExpandedViewAggregation(
const AggregateCommandRequest& request) const {
// Perform the aggregation on the resolved namespace. The new pipeline consists of two parts:
// first, 'pipeline' in this ResolvedView; then, the pipeline in 'request'.
std::vector<BSONObj> resolvedPipeline;
resolvedPipeline.reserve(_pipeline.size() + request.getPipeline().size());
resolvedPipeline.insert(resolvedPipeline.end(), _pipeline.begin(), _pipeline.end());
resolvedPipeline.insert(
resolvedPipeline.end(), request.getPipeline().begin(), request.getPipeline().end());
// $indexStats needs special handling for time-series-collections. Normally for a regular read,
// $_internalUnpackBucket unpacks the buckets entries into time-series document format and then
// passes the time-series documents on through the pipeline. Instead we need to read the buckets
// collection's index stats unmodified and then pass the results through an additional stage to
// specially convert them to the time-series collection's schema, and then onward. There is no
// need for the $_internalUnpackBucket stage with $indexStats, so we remove it.
if (resolvedPipeline.size() >= 2 &&
resolvedPipeline[0][DocumentSourceInternalUnpackBucket::kStageNameInternal] &&
resolvedPipeline[1][DocumentSourceIndexStats::kStageName]) {
// Clear the $_internalUnpackBucket stage.
auto unpackStage = resolvedPipeline[0];
resolvedPipeline[0] = resolvedPipeline[1];
// Grab the $_internalUnpackBucket stage's time-series collection schema options and pass
// them into the $_internalConvertBucketIndexStats stage to use for schema conversion.
BSONObjBuilder builder;
for (const auto& elem :
unpackStage[DocumentSourceInternalUnpackBucket::kStageNameInternal].Obj()) {
if (elem.fieldNameStringData() == timeseries::kTimeFieldName ||
elem.fieldNameStringData() == timeseries::kMetaFieldName) {
builder.append(elem);
}
}
resolvedPipeline[1] =
BSON(DocumentSourceInternalConvertBucketIndexStats::kStageName << builder.obj());
}
AggregateCommandRequest expandedRequest{_namespace, resolvedPipeline};
if (request.getExplain()) {
expandedRequest.setExplain(request.getExplain());
} else {
expandedRequest.setCursor(request.getCursor());
}
expandedRequest.setHint(request.getHint());
expandedRequest.setMaxTimeMS(request.getMaxTimeMS());
expandedRequest.setReadConcern(request.getReadConcern());
expandedRequest.setUnwrappedReadPref(request.getUnwrappedReadPref());
expandedRequest.setBypassDocumentValidation(request.getBypassDocumentValidation());
expandedRequest.setAllowDiskUse(request.getAllowDiskUse());
expandedRequest.setIsMapReduceCommand(request.getIsMapReduceCommand());
expandedRequest.setLet(request.getLet());
// Operations on a view must always use the default collation of the view. We must have already
// checked that if the user's request specifies a collation, it matches the collation of the
// view.
expandedRequest.setCollation(_defaultCollation);
return expandedRequest;
}
} // namespace mongo
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