// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
library fuchsia.developer.ffx;
using zx;
using fuchsia.io;

type DaemonError = strict enum {
    TARGET_CACHE_ERROR = 1;
    TARGET_STATE_ERROR = 2;
    RCS_CONNECTION_ERROR = 3;
    /// A generic timeout error.
    TIMEOUT = 4;

    /// When querying for a target, the cache was empty.
    TARGET_CACHE_EMPTY = 5;
    /// When querying for a target (specified or not), there were
    /// too many matches to be clear on which target was the intent
    /// of the query.
    TARGET_AMBIGUOUS = 6;
    /// When querying for a target, no matches were found.
    TARGET_NOT_FOUND = 7;
    /// When attempting to connect to RCS on a Fastboot device.
    TARGET_IN_FASTBOOT = 8;
    /// Fastboot device expected.
    NON_FASTBOOT_DEVICE = 9;
    /// When attempting to use a protocol that is not supported on the daemon.
    PROTOCOL_NOT_FOUND = 10;
    /// An error was encountered when attempting to open a protocol stream.
    PROTOCOL_OPEN_ERROR = 11;
    /// An error encountered when the daemon's protocol register is in a bad
    /// state internally. This is primarily caused by trying to open a protocol
    /// while the daaemon is actively shutting down, and should be extremely
    /// rare.
    BAD_PROTOCOL_REGISTER_STATE = 12;
    /// When attempting to connect to RCS on a Fastboot device.
    TARGET_IN_ZEDBOOT = 13;
};

@discoverable
protocol Daemon {
    /// Requests for the Daemon to exit. Receives 'true' to indicate the request
    /// was received and the Daemon will then shut down shortly thereafter.
    Quit() -> (struct {
        success bool;
    });

    // Retrieves version information about this daemon instance.
    GetVersionInfo() -> (struct {
        info VersionInfo;
    });

    /// Connects to a daemon protocol.
    ///
    /// Takes a protocol name under which the channel will be connected (the
    /// caller is intended to know the type of the channel a priori).
    ///
    /// Developers are not intended to use this directly. Instead this should
    /// be invoked automatically through the FFX plugin/protocol framework.
    ///
    /// Again for emphasis: if you are a developer and you are invoking this
    /// function directly, you should reconsider your actions.
    ConnectToProtocol(resource struct {
        name fuchsia.io.Name;
        server_end zx.handle:CHANNEL;
    }) -> (struct {}) error DaemonError;
};