sirenia/libsirenia/src/communication/persistence.rs

// Copyright 2020 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

//! Defines messages used for communication between Trichechus and Cronista for storing and
//! retrieving persistent data.

use serde::{Deserialize, Serialize};

use crate::storage::StorableMember;

/// Represents the possible status codes from an RPC.
/// Values are assigned to make it easier to interface with D-Bus.
#[derive(Debug, Deserialize, Serialize)]
pub enum Status {
    Success = 0,
    Failure = 1,
}

/// Should the data be globally available or only available within the users' sessions.
/// Values are assigned to make it easier to interface with D-Bus.
#[derive(Debug, Deserialize, Serialize)]
pub enum Scope {
    System = 0,
    Session = 1,
    Test = -1,
}

//TODO These messages also need to carry enough information to prove the entry was recorded in the
//log.
#[derive(Deserialize, Serialize)]
pub enum Request {
    Persist {
        scope: Scope,
        domain: String,
        identifier: String,
        data: StorableMember,
    },
    Retrieve {
        scope: Scope,
        domain: String,
        identifier: String,
    },
}

#[derive(Deserialize, Serialize)]
pub enum Response {
    Persist {
        status: Status,
    },
    Retrieve {
        status: Status,
        data: StorableMember,
    },
}