syntax = "proto3";
option go_package = "pdu";

service Replication {
    rpc ListFilesystems (ListFilesystemReq) returns (ListFilesystemRes);
    rpc ListFilesystemVersions (ListFilesystemVersionsReq) returns (ListFilesystemVersionsRes);
    rpc DestroySnapshots (DestroySnapshotsReq) returns (DestroySnapshotsRes);
    rpc ReplicationCursor (ReplicationCursorReq) returns (ReplicationCursorRes);
    // for Send and Recv, see package rpc
}

message ListFilesystemReq {}

message ListFilesystemRes {
    repeated Filesystem Filesystems = 1;
    bool Empty = 2;
}

message Filesystem {
    string Path = 1;
    string ResumeToken = 2;
}

message ListFilesystemVersionsReq {
    string Filesystem = 1;
}

message ListFilesystemVersionsRes {
    repeated FilesystemVersion Versions = 1;
}

message FilesystemVersion {
    enum VersionType {
        Snapshot = 0;
        Bookmark = 1;
    }
    VersionType Type = 1;
    string Name = 2;
    uint64 Guid = 3;
    uint64 CreateTXG = 4;
    string Creation = 5; // RFC 3339
}


message SendReq {
    string Filesystem  = 1;
    string From = 2;
    // May be empty / null to request a full transfer of From
    string To = 3;

    // If ResumeToken is not empty, the resume token that CAN be tried for 'zfs send' by the sender.
    // The sender MUST indicate in SendRes.UsedResumeToken
    // If it does not work, the sender SHOULD clear the resume token on their side
    // and use From and To instead
    // If ResumeToken is not empty, the GUIDs of From and To
    // MUST correspond to those encoded in the ResumeToken.
    // Otherwise, the Sender MUST return an error.
    string ResumeToken  = 4;
    bool Compress = 5;
    bool Dedup = 6;

    bool DryRun = 7;
}

message Property {
    string Name = 1;
    string Value = 2;
}

message SendRes {
    // Whether the resume token provided in the request has been used or not.
    bool UsedResumeToken = 2;

    // Expected stream size determined by dry run, not exact.
    // 0 indicates that for the given SendReq, no size estimate could be made.
    int64 ExpectedSize = 3;

    repeated Property Properties = 4;
}

message ReceiveReq {
    string Filesystem = 1; // FIXME should be snapshot name, we can enforce that on recv

    // If true, the receiver should clear the resume token before perfoming the zfs recv of the stream in the request
    bool ClearResumeToken = 2;
}

message ReceiveRes {}

message DestroySnapshotsReq {
    string Filesystem = 1;
    // Path to filesystem, snapshot or bookmark to be destroyed
    repeated FilesystemVersion Snapshots = 2;
}

message DestroySnapshotRes {
    FilesystemVersion Snapshot = 1;
    string Error = 2;
}

message DestroySnapshotsRes {
    repeated DestroySnapshotRes Results = 1;
}

message ReplicationCursorReq {
    string Filesystem = 1;
    message GetOp {}
    message SetOp {
        string Snapshot = 2;
    }
    oneof op {
        GetOp get = 2;
        SetOp set = 3;
    }
}

message ReplicationCursorRes {
    oneof Result {
        uint64 Guid = 1;
        bool Notexist = 2;
    }
}