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# Oplog Entry IDL File

global:
    cpp_namespace: "mongo::repl"

imports:
    - "mongo/idl/basic_types.idl"
    - "mongo/db/logical_session_id.idl"
    - "mongo/db/repl/optime_and_wall_time_base.idl"
    - "mongo/db/repl/replication_types.idl"

enums:
    OpType:
        description: "The type of an operation in the oplog"
        type: string
        values:
            kCommand: "c"
            kInsert: "i"
            kUpdate: "u"
            kDelete: "d"
            kNoop: "n"

structs:
    DurableReplOperation:
        description: "A document that represents an operation in a transaction. Should never be
                      used directly in server code. Instead, create an instance of ReplOperation."
        fields:
            op:
                cpp_name: opType
                type: OpType
                description: "The operation type"
            ns:
                cpp_name: nss
                type: namespacestring
                description: "The namespace on which to apply the operation"
            ui:
                cpp_name: uuid
                type: uuid
                optional: true
                description: "The UUID of the collection"
            o:
                cpp_name: object
                type: object
                description: "The operation applied"
            o2:
                cpp_name: object2
                type: object
                optional: true
                description: "Additional information about the operation applied"
            b:
                cpp_name: upsert
                type: bool
                optional: true
                description: "If true, treats this update operation as an upsert.
                              Used when extracting individual update oplog entries from the oplog
                              entry of an applyOps command that was executed with alwaysUpsert true
                              (the default). Originally added for backwards compatibility with
                              updates from 3.6 and before."

    OplogEntryBase:
        description: A document in which the server stores an oplog entry.
        inline_chained_structs: true
        chained_structs:
            OperationSessionInfo : OperationSessionInfo
            DurableReplOperation: DurableReplOperation
            OpTimeAndWallTimeBase: OpTimeAndWallTimeBase
        fields:
            h:
                cpp_name: hash
                type: long
                optional: true # Only used for backwards compatibility with 4.0 and before.
                description: "The hash of the oplog entry"
            v:
                cpp_name: version
                type: safeInt64
                default: 2
                description: "The version of the oplog"
            fromMigrate:
                type: bool
                optional: true
                description: "An operation caused by a chunk migration"
            _id:
                type: objectid
                optional: true
                description: "An optional _id field for tests that manually insert oplog entries"
            stmtId:
                cpp_name: statementId
                type: StmtId
                optional: true
                description: "Identifier of the transaction statement which generated this oplog
                              entry"
            prevOpTime:
                cpp_name: prevWriteOpTimeInTransaction
                type: optime
                optional: true # Only for writes that are part of a transaction
                description: "The opTime of the previous write with the same transaction."
            preImageOpTime:
                type: optime
                optional: true
                description: "The optime of another oplog entry that contains the document
                              before an update/remove was applied."
            postImageOpTime:
                type: optime
                optional: true
                description: "The optime of another oplog entry that contains the document
                              after an update was applied."