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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "mojo/public/cpp/platform/platform_channel_server.h"
#include <memory>
#include <utility>
#include "base/check.h"
#include "base/memory/weak_ptr.h"
#include "base/task/sequenced_task_runner.h"
#include "mojo/public/cpp/platform/platform_channel_endpoint.h"
#include "mojo/public/cpp/platform/platform_handle.h"
namespace mojo {
namespace {
// NOTE: On macOS, PlatformChannelServerEndpoint is not special, as they need to
// perform the same connection handshake as any other PlatformChannelEndpoint.
// PlatformChannelServer acts as a simple passthrough implementation for
// compatibility with application logic on other platforms.
class ListenerImpl : public PlatformChannelServer::Listener {
public:
ListenerImpl() = default;
~ListenerImpl() override = default;
// PlatformChannelServer::Listener:
bool Start(PlatformChannelServerEndpoint& server_endpoint,
PlatformChannelServer::ConnectionCallback& callback) override {
if (!server_endpoint.is_valid() ||
!server_endpoint.platform_handle().is_mach_receive()) {
return false;
}
// Invoke the callback asynchronously to guard against re-entrancy issues.
// This simply repackages the server endpoint as a PlatformChannelEndpoint,
// since they're functionally equivalent on macOS. Note that we post the
// task as a WeakPtr-bound method to ensure that it doesn't run if the
// Listener is destroyed first.
PlatformChannelEndpoint endpoint{server_endpoint.TakePlatformHandle()};
base::SequencedTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE, base::BindOnce(&ListenerImpl::RunCallback,
weak_ptr_factory_.GetWeakPtr(),
std::move(callback), std::move(endpoint)));
return true;
}
private:
void RunCallback(PlatformChannelServer::ConnectionCallback callback,
PlatformChannelEndpoint endpoint) {
std::move(callback).Run(std::move(endpoint));
}
base::WeakPtrFactory<ListenerImpl> weak_ptr_factory_{this};
};
} // namespace
std::unique_ptr<PlatformChannelServer::Listener>
PlatformChannelServer::Listener::Create() {
return std::make_unique<ListenerImpl>();
}
} // namespace mojo
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