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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.
#
# Document source change stream stage IDL file
global:
cpp_namespace: "mongo"
cpp_includes:
- "mongo/db/pipeline/resume_token.h"
imports:
- "mongo/idl/basic_types.idl"
types:
# A resume token is an opaque document we return to the user that contains all the information
# needed to resume a stream where they left off. It also provides the ordering of streams
# from multiple shards.
resumeToken:
bson_serialization_type: object
description: An object representing a resume token for a change stream
cpp_type: ResumeToken
# The IDL requires a serializer for any custom type. The serializer for this type actually
# needs to know which format to use though, so requires an argument which is not currently
# supported by the IDL. We don't expect anyone to use the IDL to serialize the type, so we
# just provide a dummy serializer here.
serializer: ResumeToken::toBSON_do_not_use
deserializer: ResumeToken::parse
structs:
ResumeTokenClusterTime:
description: The IDL type of cluster time
fields:
ts:
cpp_name: timestamp
type: timestamp
description: The timestamp of the logical time
DocumentSourceChangeStreamSpec:
description: A document used to specify the $changeStream stage of an aggregation
pipeline.
fields:
resumeAfter:
cpp_name: resumeAfter
type: resumeToken
optional: true
description: An object representing the point at which we should resume reporting
changes from.
startAfter:
cpp_name: startAfter
type: resumeToken
optional: true
description: An object representing the point at which we should start reporting
changes from. This is allowed to be a token from an invalidating
command.
startAtOperationTime:
cpp_name: startAtOperationTime
type: timestamp
optional: true
description: The operation time after which we should start reporting changes.
Only one of resumeAfter, _resumeAfterClusterTimeDeprecated, and
startAtOperationTime should be specified.
fullDocument:
cpp_name: fullDocument
type: string
default: '"default"'
description: A string '"updateLookup"' or '"default"', indicating whether or not we
should return a full document or just changes for an update.
allChangesForCluster:
cpp_name: allChangesForCluster
type: bool
default: false
description: A flag indicating whether the stream should report all changes that
occur on the deployment, aside from those on internal databases or
collections.
showMigrationEvents:
cpp_name: showMigrationEvents
type: bool
default: false
description: A flag indicating whether the stream should report changes that occur
on the deployment that are related to chunk migrations. These
operations are reported like normal events. For example, inserts and
deletes may appear that do not reflect actual deletions or insertions
of data. Instead they reflect this data moving from one shard to
another.
allowToRunOnConfigDB:
cpp_name: allowToRunOnConfigDB
type: bool
default: false
description: A flag indicating whether the change stream may be opened on the
'config' database, which is usually banned. This flag is used
internally to allow mongoS to open a stream on 'config.shards', in
order to monitor for the addition of new shards to the cluster.
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