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/**
* Copyright (C) 2021-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/util/assert_util.h"
#include "mongo/platform/basic.h"
#include "mongo/db/pipeline/document_source_change_stream_add_pre_image.h"
#include "mongo/bson/simple_bsonelement_comparator.h"
#include "mongo/db/change_stream_serverless_helpers.h"
#include "mongo/db/pipeline/change_stream_helpers_legacy.h"
#include "mongo/db/pipeline/change_stream_preimage_gen.h"
#include "mongo/db/transaction/transaction_history_iterator.h"
#include "mongo/util/intrusive_counter.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kCommand
namespace mongo {
namespace {
REGISTER_INTERNAL_DOCUMENT_SOURCE(_internalChangeStreamAddPreImage,
LiteParsedDocumentSourceChangeStreamInternal::parse,
DocumentSourceChangeStreamAddPreImage::createFromBson,
true);
} // namespace
constexpr StringData DocumentSourceChangeStreamAddPreImage::kStageName;
constexpr StringData DocumentSourceChangeStreamAddPreImage::kFullDocumentBeforeChangeFieldName;
boost::intrusive_ptr<DocumentSourceChangeStreamAddPreImage>
DocumentSourceChangeStreamAddPreImage::create(const boost::intrusive_ptr<ExpressionContext>& expCtx,
const DocumentSourceChangeStreamSpec& spec) {
auto mode = spec.getFullDocumentBeforeChange();
return make_intrusive<DocumentSourceChangeStreamAddPreImage>(expCtx, mode);
}
boost::intrusive_ptr<DocumentSourceChangeStreamAddPreImage>
DocumentSourceChangeStreamAddPreImage::createFromBson(
const BSONElement elem, const boost::intrusive_ptr<ExpressionContext>& expCtx) {
uassert(5467610,
str::stream() << "the '" << kStageName << "' stage spec must be an object",
elem.type() == BSONType::Object);
auto parsedSpec = DocumentSourceChangeStreamAddPreImageSpec::parse(
IDLParserContext("DocumentSourceChangeStreamAddPreImageSpec"), elem.Obj());
return make_intrusive<DocumentSourceChangeStreamAddPreImage>(
expCtx, parsedSpec.getFullDocumentBeforeChange());
}
DocumentSource::GetNextResult DocumentSourceChangeStreamAddPreImage::doGetNext() {
auto input = pSource->getNext();
if (!input.isAdvanced()) {
return input;
}
// If this is not an update, replace or delete, then just pass along the result.
const auto kOpTypeField = DocumentSourceChangeStream::kOperationTypeField;
const auto opType = input.getDocument()[kOpTypeField];
DocumentSourceChangeStream::checkValueType(opType, kOpTypeField, BSONType::String);
if (opType.getStringData() != DocumentSourceChangeStream::kUpdateOpType &&
opType.getStringData() != DocumentSourceChangeStream::kReplaceOpType &&
opType.getStringData() != DocumentSourceChangeStream::kDeleteOpType) {
return input;
}
auto preImageId = input.getDocument()[kPreImageIdFieldName];
tassert(6091900, "Pre-image id field is missing", !preImageId.missing());
tassert(5868900,
"Expected pre-image id field to be a document",
preImageId.getType() == BSONType::Object);
// Obtain the pre-image document, if available, given the specified preImageId.
auto preImageDoc = lookupPreImage(pExpCtx, preImageId.getDocument());
uassert(
ErrorCodes::NoMatchingDocument,
str::stream() << "Change stream was configured to require a pre-image for all update, "
"delete and replace events, but the pre-image was not found for event: "
<< makePreImageNotFoundErrorMsg(input.getDocument()),
preImageDoc ||
_fullDocumentBeforeChangeMode != FullDocumentBeforeChangeModeEnum::kRequired);
// Even if no pre-image was found, we have to populate the 'fullDocumentBeforeChange' field.
MutableDocument outputDoc(input.releaseDocument());
outputDoc[kFullDocumentBeforeChangeFieldName] =
(preImageDoc ? Value(*preImageDoc) : Value(BSONNULL));
// Do not propagate preImageId field further through the pipeline.
outputDoc.remove(kPreImageIdFieldName);
return outputDoc.freeze();
}
boost::optional<Document> DocumentSourceChangeStreamAddPreImage::lookupPreImage(
boost::intrusive_ptr<ExpressionContext> pExpCtx, const Document& preImageId) {
// Look up the pre-image document on the local node by id.
const auto tenantId = change_stream_serverless_helpers::resolveTenantId(pExpCtx->ns.tenantId());
auto lookedUpDoc = pExpCtx->mongoProcessInterface->lookupSingleDocumentLocally(
pExpCtx,
NamespaceString::makePreImageCollectionNSS(tenantId),
Document{{ChangeStreamPreImage::kIdFieldName, preImageId}});
// Return boost::none to signify that we failed to find the pre-image.
if (!lookedUpDoc) {
return boost::none;
}
// Return "preImage" field value from the document.
auto preImageField = lookedUpDoc->getField(ChangeStreamPreImage::kPreImageFieldName);
tassert(
6148000, "Pre-image document must contain the 'preImage' field", !preImageField.nullish());
return preImageField.getDocument().getOwned();
}
Value DocumentSourceChangeStreamAddPreImage::serialize(SerializationOptions opts) const {
BSONObjBuilder builder;
if (opts.verbosity) {
BSONObjBuilder sub(builder.subobjStart(DocumentSourceChangeStream::kStageName));
sub.append("stage"_sd, kStageName);
opts.serializeLiteralValue(
FullDocumentBeforeChangeMode_serializer(_fullDocumentBeforeChangeMode))
.addToBsonObj(&sub, kFullDocumentBeforeChangeFieldName);
sub.done();
} else {
BSONObjBuilder sub(builder.subobjStart(kStageName));
if (opts.replacementForLiteralArgs) {
sub.append(
DocumentSourceChangeStreamAddPreImageSpec::kFullDocumentBeforeChangeFieldName,
*opts.replacementForLiteralArgs);
} else {
DocumentSourceChangeStreamAddPreImageSpec(_fullDocumentBeforeChangeMode)
.serialize(&sub);
}
sub.done();
}
return Value(builder.obj());
}
std::string DocumentSourceChangeStreamAddPreImage::makePreImageNotFoundErrorMsg(
const Document& event) {
auto errMsgDoc = Document{{"operationType", event["operationType"]},
{"ns", event["ns"]},
{"clusterTime", event["clusterTime"]},
{"txnNumber", event["txnNumber"]}};
return errMsgDoc.toString();
}
} // namespace mongo
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