Status ShardingMetadata::downconvert(const BSONObj& commandReply,
const BSONObj& replyMetadata,
BSONObjBuilder* legacyCommandReplyBob) {
legacyCommandReplyBob->appendElements(commandReply);
auto swShardingMetadata = readFromMetadata(replyMetadata);
if (swShardingMetadata.isOK()) {
// We can reuse the same logic to write the sharding metadata out to the legacy
// command as the element has the same format whether it is there or on the metadata
// object.
swShardingMetadata.getValue().writeToMetadata(legacyCommandReplyBob);
} else if (swShardingMetadata.getStatus() == ErrorCodes::NoSuchKey) {
// It is valid to not have a $gleStats field.
} else {
return swShardingMetadata.getStatus();
}
return Status::OK();
}
Status ShardingMetadata::upconvert(const BSONObj& legacyCommand,
BSONObjBuilder* commandBob,
BSONObjBuilder* metadataBob) {
// We can reuse the same logic to read the sharding metadata out from the legacy command
// as it has the same format whether it is there or on the metadata object.
auto swShardingMetadata = readFromMetadata(legacyCommand);
if (swShardingMetadata.isOK()) {
swShardingMetadata.getValue().writeToMetadata(metadataBob);
// Write out the command excluding the $gleStats subobject.
for (const auto& elem : legacyCommand) {
if (elem.fieldNameStringData() != StringData(kGLEStatsFieldName)) {
commandBob->append(elem);
}
}
} else if (swShardingMetadata.getStatus() == ErrorCodes::NoSuchKey) {
// it is valid to not have a $gleStats field
commandBob->appendElements(legacyCommand);
} else {
return swShardingMetadata.getStatus();
}
return Status::OK();
}
MetadataSavingCopy::MetadataSavingCopy(Common::BasicKeywordsModel *keywordsModel) {
readFromMetadata(keywordsModel);
}
StatusWith<ServerSelectionMetadata> ServerSelectionMetadata::readFromMetadata(
const BSONObj& metadataObj) {
return readFromMetadata(metadataObj.getField(fieldName()));
}
StatusWith<LogicalTimeMetadata> LogicalTimeMetadata::readFromMetadata(const BSONObj& metadata) {
return readFromMetadata(metadata.getField(fieldName()));
}
