sdk/fidl/fuchsia.component.decl/expose.fidl

// Copyright 2021 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.component.decl;

using fuchsia.io;

/// Declares a capability exposed to either a component's containing realm or to the framework.
/// For example, a legacy service exposed by the component at runtime.
type Expose = flexible union {
    1: service ExposeService;
    2: protocol ExposeProtocol;
    3: directory ExposeDirectory;
    4: runner ExposeRunner;
    5: resolver ExposeResolver;
    6: event_stream ExposeEventStream;
};

/// Declares a service exposed to a component's containing realm, such as a
/// service exposed by the component or one of its children at runtime.
///
/// To learn more about services, see:
/// https://fuchsia.dev/fuchsia-src/glossary#service
type ExposeService = table {
    /// The provider of the capability relative to the component itself. Must
    /// be `self` or `child`.
    1: source Ref;

    /// Name identifying the service, by which it was presented to this
    /// component.
    2: source_name name;

    /// The destination to which the service is exposed: either the component's realm or the
    /// framework.
    3: target Ref;

    /// The name by which the capability is being exposed.
    4: target_name name;
};

/// Declares a protocol exposed to a component's containing realm, such as
/// a protocol exposed by the component or one of its children at runtime.
///
/// To learn more about protocols, see:
/// https://fuchsia.dev/fuchsia-src/glossary#protocol
type ExposeProtocol = table {
    /// The provider of the capability relative to the component itself. Must
    /// be `self` or `child`.
    1: source Ref;

    /// Name identifying the protocol, by which it was presented to this
    /// component.
    2: source_name name;

    /// The destination to which the protocol is exposed: either the component's
    /// realm or the framework.
    3: target Ref;

    /// The name by which the capability is being exposed.
    4: target_name name;
};

/// Declares a directory exposed to a component's containing realm, such as a
/// directory exposed by the component or one of its children at runtime.
type ExposeDirectory = table {
    /// The provider of the capability relative to the component itself. Must
    /// be `self` or `child`.
    1: source Ref;

    /// Name identifying the directory, by which it was presented to this
    /// component.
    2: source_name name;

    /// The destination to which the directory is exposed: either the component's realm or the
    /// framework.
    3: target Ref;

    /// The name by which the capability is being exposed.
    4: target_name name;

    /// The maximum rights that can be set by a component using this directory,
    /// required iff `source == self`.
    5: rights fuchsia.io.Rights;

    /// The subdirectory of this directory to expose instead of the root. Optional.
    6: subdir string:MAX_PATH_LENGTH;
};

/// Declares a runner exposed to a component's containing realm, such as a
/// runner exposed by the component or one of its children at runtime.
type ExposeRunner = table {
    /// The provider of the capability relative to the component itself. Must
    /// be `self` or `child`.
    1: source Ref;

    /// The name of the runner, by which it was presented to this component.
    2: source_name name;

    /// The destination to which the runner is exposed: either the component's realm or the
    /// framework.
    3: target Ref;

    /// The name by which the capability is being exposed.
    4: target_name name;
};

/// Declares a resolver exposed to a component's containing realm, such as a
/// resolver exposed by the component or one of its children at runtime.
type ExposeResolver = table {
    /// The provider of the capability relative to the component itself. Must
    /// be `self` or `child`.
    1: source Ref;

    /// The name of the resolver, by which it was presented to this component.
    2: source_name name;

    /// The destination to which the resolver is exposed
    3: target Ref;

    /// The name by which the capability is being exposed.
    4: target_name name;
};

/// Declares an event stream exposed to a component's containing realm, such as
/// an event stream exposed by the component or one of its children at runtime.
type ExposeEventStream = table {
    /// The provider of the capability relative to the component itself. Must
    /// be `child`, or `framework`.
    1: source Ref;

    /// The name of the event stream
    2: source_name name;

    /// When an event is exposed from framework,
    /// the scope is required and allows one to define the
    /// child (or array of children) which the event is about.
    3: scope vector<Ref>:MAX;

    /// The destination to which the event stream is exposed.
    4: target Ref;

    /// The name by which the capability is being exposed.
    5: target_name name;
};