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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_FUCHSIA_SCOPED_SERVICE_BINDING_H_
#define BASE_FUCHSIA_SCOPED_SERVICE_BINDING_H_
// TODO(crbug.com/42050587): Remove this include once the explicit
// async_get_default_dispatcher() is no longer needed.
#include <lib/async/default.h>
#include <lib/fidl/cpp/binding.h>
#include <lib/fidl/cpp/binding_set.h>
#include <lib/fidl/cpp/interface_request.h>
#include <lib/fidl/cpp/wire/connect_service.h>
#include <lib/zx/channel.h>
#include <optional>
#include <string_view>
#include <utility>
#include "base/base_export.h"
#include "base/fuchsia/scoped_service_publisher.h"
#include "base/functional/callback.h"
namespace sys {
class OutgoingDirectory;
} // namespace sys
namespace vfs {
class PseudoDir;
} // namespace vfs
namespace base {
template <typename Interface>
class BASE_EXPORT ScopedServiceBinding {
public:
// Publishes a public service in the specified |outgoing_directory|.
// |outgoing_directory| and |impl| must outlive the binding. The service is
// unpublished on destruction.
ScopedServiceBinding(sys::OutgoingDirectory* outgoing_directory,
Interface* impl,
std::string_view name = Interface::Name_)
: publisher_(outgoing_directory, bindings_.GetHandler(impl), name) {}
// Publishes a service in the specified |pseudo_dir|. |pseudo_dir| and |impl|
// must outlive the binding. The service is unpublished on destruction.
ScopedServiceBinding(vfs::PseudoDir* pseudo_dir,
Interface* impl,
std::string_view name = Interface::Name_)
: publisher_(pseudo_dir, bindings_.GetHandler(impl), name) {}
ScopedServiceBinding(const ScopedServiceBinding&) = delete;
ScopedServiceBinding& operator=(const ScopedServiceBinding&) = delete;
~ScopedServiceBinding() = default;
// |on_last_client_callback| will be called every time the number of connected
// clients drops to 0.
void SetOnLastClientCallback(base::RepeatingClosure on_last_client_callback) {
bindings_.set_empty_set_handler(
[callback = std::move(on_last_client_callback)] { callback.Run(); });
}
bool has_clients() const { return bindings_.size() != 0; }
private:
fidl::BindingSet<Interface> bindings_;
ScopedServicePublisher<Interface> publisher_;
};
template <typename Protocol>
class BASE_EXPORT ScopedNaturalServiceBinding {
public:
// Publishes a public service in the specified |outgoing_directory|.
// |outgoing_directory| and |impl| must outlive the binding. The service is
// unpublished on destruction.
ScopedNaturalServiceBinding(
sys::OutgoingDirectory* outgoing_directory,
fidl::Server<Protocol>* impl,
std::string_view name = fidl::DiscoverableProtocolName<Protocol>)
: publisher_(
outgoing_directory,
bindings_.CreateHandler(
impl,
// TODO(crbug.com/42050587): Remove this param once there's an
// overload of `CreateHandler` that doesn't require it.
async_get_default_dispatcher(),
[](fidl::UnbindInfo info) {}),
name) {}
// Publishes a service in the specified |pseudo_dir|. |pseudo_dir| and |impl|
// must outlive the binding. The service is unpublished on destruction.
ScopedNaturalServiceBinding(
vfs::PseudoDir* pseudo_dir,
fidl::Server<Protocol>* impl,
std::string_view name = fidl::DiscoverableProtocolName<Protocol>)
: publisher_(
pseudo_dir,
bindings_.CreateHandler(
impl,
// TODO(crbug.com/42050587): Remove this param once there's an
// overload of `CreateHandler` that doesn't require it.
async_get_default_dispatcher(),
[](fidl::UnbindInfo info) {}),
name) {}
ScopedNaturalServiceBinding(const ScopedNaturalServiceBinding&) = delete;
ScopedNaturalServiceBinding& operator=(const ScopedNaturalServiceBinding&) =
delete;
~ScopedNaturalServiceBinding() = default;
// Registers `on_last_client_callback` to be called every time the number of
// connected clients drops to 0.
void SetOnLastClientCallback(base::RepeatingClosure on_last_client_callback) {
bindings_.set_empty_set_handler(
[callback = std::move(on_last_client_callback)] { callback.Run(); });
}
bool has_clients() const { return bindings_.size() != 0; }
private:
fidl::ServerBindingGroup<Protocol> bindings_;
ScopedNaturalServicePublisher<Protocol> publisher_;
};
// Scoped service binding which allows only a single client to be connected
// at any time. By default a new connection will disconnect an existing client.
enum class ScopedServiceBindingPolicy {
kPreferNew,
kPreferExisting,
kConnectOnce
};
template <typename Interface,
ScopedServiceBindingPolicy Policy =
ScopedServiceBindingPolicy::kPreferNew>
class BASE_EXPORT ScopedSingleClientServiceBinding {
public:
// |outgoing_directory| and |impl| must outlive the binding.
ScopedSingleClientServiceBinding(sys::OutgoingDirectory* outgoing_directory,
Interface* impl,
std::string_view name = Interface::Name_)
: binding_(impl) {
publisher_.emplace(
outgoing_directory,
fit::bind_member(this, &ScopedSingleClientServiceBinding::BindClient),
name);
binding_.set_error_handler(fit::bind_member(
this, &ScopedSingleClientServiceBinding::OnBindingEmpty));
}
ScopedSingleClientServiceBinding(vfs::PseudoDir* publish_to,
Interface* impl,
std::string_view name = Interface::Name_)
: binding_(impl) {
publisher_.emplace(
publish_to,
fit::bind_member(this, &ScopedSingleClientServiceBinding::BindClient),
name);
binding_.set_error_handler(fit::bind_member(
this, &ScopedSingleClientServiceBinding::OnBindingEmpty));
}
ScopedSingleClientServiceBinding(const ScopedSingleClientServiceBinding&) =
delete;
ScopedSingleClientServiceBinding& operator=(
const ScopedSingleClientServiceBinding&) = delete;
~ScopedSingleClientServiceBinding() = default;
typename Interface::EventSender_& events() { return binding_.events(); }
// |on_last_client_callback| will be called the first time a client
// disconnects. It is still possible for a client to connect after that point
// if Policy is kPreferNew of kPreferExisting.
void SetOnLastClientCallback(base::OnceClosure on_last_client_callback) {
on_last_client_callback_ = std::move(on_last_client_callback);
}
bool has_clients() const { return binding_.is_bound(); }
private:
void BindClient(fidl::InterfaceRequest<Interface> request) {
if (Policy == ScopedServiceBindingPolicy::kPreferExisting &&
binding_.is_bound()) {
return;
}
binding_.Bind(std::move(request));
if (Policy == ScopedServiceBindingPolicy::kConnectOnce) {
publisher_.reset();
}
}
void OnBindingEmpty(zx_status_t status) {
if (on_last_client_callback_) {
std::move(on_last_client_callback_).Run();
}
}
fidl::Binding<Interface> binding_;
std::optional<ScopedServicePublisher<Interface>> publisher_;
base::OnceClosure on_last_client_callback_;
};
} // namespace base
#endif // BASE_FUCHSIA_SCOPED_SERVICE_BINDING_H_
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