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// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_RENDERER_AGENT_SCHEDULING_GROUP_H_
#define CONTENT_RENDERER_AGENT_SCHEDULING_GROUP_H_
#include "base/containers/id_map.h"
#include "content/common/agent_scheduling_group.mojom.h"
#include "content/common/associated_interfaces.mojom.h"
#include "content/common/content_export.h"
#include "mojo/public/cpp/bindings/associated_receiver.h"
#include "mojo/public/cpp/bindings/associated_receiver_set.h"
#include "mojo/public/cpp/bindings/associated_remote.h"
#include "mojo/public/cpp/bindings/receiver.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "third_party/abseil-cpp/absl/types/variant.h"
#include "third_party/blink/public/mojom/associated_interfaces/associated_interfaces.mojom.h"
#include "third_party/blink/public/platform/scheduler/web_agent_group_scheduler.h"
namespace IPC {
class Listener;
class Message;
} // namespace IPC
namespace content {
class RenderThread;
// Renderer-side representation of AgentSchedulingGroup, used for communication
// with the (browser-side) AgentSchedulingGroupHost. AgentSchedulingGroup is
// Blink's unit of scheduling and performance isolation, which is the only way
// to obtain ordering guarantees between different Mojo (associated) interfaces
// and legacy IPC messages.
class CONTENT_EXPORT AgentSchedulingGroup
: public mojom::AgentSchedulingGroup,
public mojom::RouteProvider,
public blink::mojom::AssociatedInterfaceProvider {
public:
AgentSchedulingGroup(
RenderThread& render_thread,
mojo::PendingRemote<mojom::AgentSchedulingGroupHost> host_remote,
mojo::PendingReceiver<mojom::AgentSchedulingGroup> receiver);
AgentSchedulingGroup(
RenderThread& render_thread,
mojo::PendingAssociatedRemote<mojom::AgentSchedulingGroupHost>
host_remote,
mojo::PendingAssociatedReceiver<mojom::AgentSchedulingGroup> receiver);
~AgentSchedulingGroup() override;
AgentSchedulingGroup(const AgentSchedulingGroup&) = delete;
AgentSchedulingGroup(const AgentSchedulingGroup&&) = delete;
AgentSchedulingGroup& operator=(const AgentSchedulingGroup&) = delete;
AgentSchedulingGroup& operator=(const AgentSchedulingGroup&&) = delete;
bool Send(IPC::Message* message);
void AddRoute(int32_t routing_id, IPC::Listener* listener);
void RemoveRoute(int32_t routing_id);
// This is virtual only for unit tests.
virtual mojom::RouteProvider* GetRemoteRouteProvider();
blink::scheduler::WebAgentGroupScheduler& agent_group_scheduler() {
return *agent_group_scheduler_;
}
private:
// `MaybeAssociatedReceiver` and `MaybeAssociatedRemote` are temporary helper
// classes that allow us to switch between using associated and non-associated
// mojo interfaces. This behavior is controlled by the
// `kMbiDetachAgentSchedulingGroupFromChannel` feature flag.
// Associated interfaces are associated with the IPC channel (transitively,
// via the `Renderer` interface), thus preserving cross-agent scheduling group
// message order. Non-associated interfaces are independent from each other
// and do not preserve message order between agent scheduling groups.
// TODO(crbug.com/1111231): Remove these once we can remove the flag.
class MaybeAssociatedReceiver {
public:
MaybeAssociatedReceiver(
AgentSchedulingGroup& impl,
mojo::PendingReceiver<mojom::AgentSchedulingGroup> receiver,
scoped_refptr<base::SingleThreadTaskRunner> task_runner);
MaybeAssociatedReceiver(
AgentSchedulingGroup& impl,
mojo::PendingAssociatedReceiver<mojom::AgentSchedulingGroup> receiver,
scoped_refptr<base::SingleThreadTaskRunner> task_runner);
~MaybeAssociatedReceiver();
private:
absl::variant<mojo::Receiver<mojom::AgentSchedulingGroup>,
mojo::AssociatedReceiver<mojom::AgentSchedulingGroup>>
receiver_;
};
class MaybeAssociatedRemote {
public:
explicit MaybeAssociatedRemote(
mojo::PendingRemote<mojom::AgentSchedulingGroupHost> host_remote,
scoped_refptr<base::SingleThreadTaskRunner> task_runner);
explicit MaybeAssociatedRemote(
mojo::PendingAssociatedRemote<mojom::AgentSchedulingGroupHost>
host_remote,
scoped_refptr<base::SingleThreadTaskRunner> task_runner);
~MaybeAssociatedRemote();
mojom::AgentSchedulingGroupHost* get();
private:
absl::variant<mojo::Remote<mojom::AgentSchedulingGroupHost>,
mojo::AssociatedRemote<mojom::AgentSchedulingGroupHost>>
remote_;
};
// mojom::AgentSchedulingGroup:
void CreateView(mojom::CreateViewParamsPtr params) override;
void DestroyView(int32_t view_id, DestroyViewCallback callback) override;
void CreateFrame(mojom::CreateFrameParamsPtr params) override;
void CreateFrameProxy(
int32_t routing_id,
int32_t render_view_routing_id,
const base::Optional<base::UnguessableToken>& opener_frame_token,
int32_t parent_routing_id,
const FrameReplicationState& replicated_state,
const base::UnguessableToken& frame_token,
const base::UnguessableToken& devtools_frame_token) override;
void BindAssociatedRouteProvider(
mojo::PendingAssociatedRemote<mojom::RouteProvider> remote,
mojo::PendingAssociatedReceiver<mojom::RouteProvider> receiever) override;
// mojom::RouteProvider
void GetRoute(
int32_t routing_id,
mojo::PendingAssociatedReceiver<blink::mojom::AssociatedInterfaceProvider>
receiver) override;
// blink::mojom::AssociatedInterfaceProvider
void GetAssociatedInterface(
const std::string& name,
mojo::PendingAssociatedReceiver<blink::mojom::AssociatedInterface>
receiver) override;
IPC::Listener* GetListener(int32_t routing_id);
// Map of registered IPC listeners.
base::IDMap<IPC::Listener*> listener_map_;
// A dedicated scheduler for this AgentSchedulingGroup.
std::unique_ptr<blink::scheduler::WebAgentGroupScheduler>
agent_group_scheduler_;
RenderThread& render_thread_;
// Implementation of `mojom::AgentSchedulingGroup`, used for responding to
// calls from the (browser-side) `AgentSchedulingGroupHost`.
MaybeAssociatedReceiver receiver_;
// Remote stub of mojom::AgentSchedulingGroupHost, used for sending calls to
// the (browser-side) AgentSchedulingGroupHost.
MaybeAssociatedRemote host_remote_;
// The |mojom::RouteProvider| mojo pair to setup
// |blink::AssociatedInterfaceProvider| routes between us and the browser-side
// |AgentSchedulingGroup|.
mojo::AssociatedRemote<mojom::RouteProvider> remote_route_provider_;
mojo::AssociatedReceiver<mojom::RouteProvider> route_provider_receiver_{this};
// The `blink::mojom::AssociatedInterfaceProvider` receiver set that *all*
// browser-side `blink::AssociatedInterfaceProvider` objects own a remote to.
// `AgentSchedulingGroupHost` will be responsible for routing each associated
// interface request to the appropriate renderer object.
mojo::AssociatedReceiverSet<blink::mojom::AssociatedInterfaceProvider,
int32_t>
associated_interface_provider_receivers_;
};
} // namespace content
#endif
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