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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/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.
                              Added for backwards compatibility with updates from 3.6 and before."

    OplogEntryBase:
        description: A document in which the server stores an oplog entry.
        immutable: true
        inline_chained_structs: true
        chained_structs:
            OperationSessionInfo : OperationSessionInfo
            DurableReplOperation: DurableReplOperation
        fields:
            ts:
                cpp_name: timestamp
                type: timestamp
                description: "The time when the oplog entry was created"
            t:
                cpp_name: term
                type: long
                optional: true # The term is optional for PV0 oplog entries.
                description: "The term of the primary that created the oplog entry"
            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: 1
                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"
            wall:
                cpp_name: wallClockTime
                type: date
                optional: true # Optional for older than 3.6 releases
                description: "A wallclock time with MS resolution"
            stmtId:
                cpp_name: statementId
                type: StmtId
                optional: true # If txnNumber is missing, this will also be absent, otherwise it
                               # must exist.
                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."