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// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef PPAPI_PROXY_PLUGIN_MESSAGE_FILTER_H_
#define PPAPI_PROXY_PLUGIN_MESSAGE_FILTER_H_
#include <set>
#include <vector>
#include "base/compiler_specific.h"
#include "base/memory/scoped_refptr.h"
#include "ipc/ipc_sender.h"
#include "ipc/message_filter.h"
#include "ppapi/c/pp_instance.h"
#include "ppapi/proxy/ppapi_proxy_export.h"
#include "ppapi/proxy/resource_message_filter.h"
namespace ppapi {
namespace proxy {
class ResourceMessageReplyParams;
class ResourceReplyThreadRegistrar;
// Listens for messages on the I/O thread of the plugin and handles some of
// them to avoid needing to block on the plugin.
//
// There is one instance of this class for each renderer channel (same as for
// the PluginDispatchers).
class PPAPI_PROXY_EXPORT PluginMessageFilter : public IPC::MessageFilter,
public IPC::Sender {
public:
// |seen_instance_ids| is a pointer to a set that will be used to uniquify
// PP_Instances across all renderer channels. The same pointer should be
// passed to each MessageFilter to ensure uniqueness, and the value should
// outlive this class. It could be NULL if this filter is for a browser
// channel.
// |thread_registrar| is used to look up handling threads for resource
// reply messages. It shouldn't be NULL.
PluginMessageFilter(
std::set<PP_Instance>* seen_instance_ids,
scoped_refptr<ResourceReplyThreadRegistrar> thread_registrar);
~PluginMessageFilter() override;
// MessageFilter implementation.
void OnFilterAdded(IPC::Channel* channel) override;
void OnFilterRemoved() override;
bool OnMessageReceived(const IPC::Message& message) override;
// IPC::Sender implementation.
bool Send(IPC::Message* msg) override;
void AddResourceMessageFilter(
const scoped_refptr<ResourceMessageFilter>& filter);
// Simulates an incoming resource reply that is handled on the calling thread.
// For testing only.
static void DispatchResourceReplyForTest(
const ResourceMessageReplyParams& reply_params,
const IPC::Message& nested_msg);
private:
void OnMsgReserveInstanceId(PP_Instance instance, bool* usable);
void OnMsgResourceReply(const ResourceMessageReplyParams& reply_params,
const IPC::Message& nested_msg);
// Dispatches the given resource reply to the appropriate resource in the
// plugin process.
static void DispatchResourceReply(
const ResourceMessageReplyParams& reply_params,
const IPC::Message& nested_msg);
// All instance IDs ever queried by any renderer on this plugin. This is used
// to make sure that new instance IDs are unique. This is a non-owning
// pointer. It is managed by PluginDispatcher::PluginDelegate.
std::set<PP_Instance>* seen_instance_ids_;
scoped_refptr<ResourceReplyThreadRegistrar> resource_reply_thread_registrar_;
std::vector<scoped_refptr<ResourceMessageFilter>> resource_filters_;
// The IPC sender to the renderer. May be NULL if we're not currently
// attached as a filter.
IPC::Sender* sender_;
};
} // namespace proxy
} // namespace ppapi
#endif // PPAPI_PROXY_PLUGIN_MESSAGE_FILTER_H_
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