ppapi: PPB_VpnProvider: Implement Resource Stub

ppapi/proxy/vpn_provider_resource.h

+// Copyright (c) 2016 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 PPAPI_PROXY_VPN_PROVIDER_RESOURCE_H_
+#define PPAPI_PROXY_VPN_PROVIDER_RESOURCE_H_
+
+#include <memory>
+#include <queue>
+
+#include "ppapi/proxy/plugin_resource.h"
+#include "ppapi/shared_impl/tracked_callback.h"
+#include "ppapi/shared_impl/var.h"
+#include "ppapi/shared_impl/vpn_provider_util.h"
+#include "ppapi/thunk/ppb_vpn_provider_api.h"
+
+namespace ppapi {
+namespace proxy {
+
+class PPAPI_PROXY_EXPORT VpnProviderResource
+    : public PluginResource,
+      public NON_EXPORTED_BASE(thunk::PPB_VpnProvider_API) {
+ public:
+  VpnProviderResource(Connection connection, PP_Instance instance);
+  virtual ~VpnProviderResource();
+
+  // PluginResource implementation.
+  virtual thunk::PPB_VpnProvider_API* AsPPB_VpnProvider_API() override;
+
+  // PPB_VpnProvider_API implementation.
+  virtual int32_t Bind(const PP_Var& configuration_id,
+                       const PP_Var& configuration_name,
+                       const scoped_refptr<TrackedCallback>& callback) override;
+  virtual int32_t SendPacket(
+      const PP_Var& packet,
+      const scoped_refptr<TrackedCallback>& callback) override;
+  virtual int32_t ReceivePacket(
+      PP_Var* packet,
+      const scoped_refptr<TrackedCallback>& callback) override;
+
+ private:
+  // PluginResource overrides.
+  virtual void OnReplyReceived(const ResourceMessageReplyParams& params,
+                               const IPC::Message& msg) override;
+
+  // PPB_VpnProvider IPC Replies
+  void OnPluginMsgBindReply(const ResourceMessageReplyParams& params,
+                            uint32_t queue_depth,
+                            uint32_t max_packet_size,
+                            int32_t result);
+  void OnPluginMsgSendPacketReply(const ResourceMessageReplyParams& params,
+                                  int32_t result);
+
+  // Browser callbacks
+  void OnPluginMsgOnUnbindReceived(const ResourceMessageReplyParams& params);
+  void OnPluginMsgOnPacketReceived(const ResourceMessageReplyParams& params,
+                                   uint32_t packet_size,
+                                   uint32_t id);
+
+  // Picks up a received packet and moves it to user buffer. This method is used
+  // in both ReceivePacket() for fast returning path, and in
+  // OnPluginMsgOnPacketReceived() for delayed callback invocations.
+  void WritePacket();
+
+  // Send a packet to the browser. This method is used in both SendPacket() for

[bbudge, 2016/05/17 09:50:12]

nit s/Send/Sends

[adrian.belgun, 2016/05/17 11:05:29]

Done.

+  // fast path, and in OnPluginMsgSendPacketReply for processing previously
+  // queued packets.
+  int32_t DoSendPacket(const PP_Var& packet, uint32_t id);
+
+  // Holds user callbacks to invoke later.

[bbudge, 2016/05/17 09:50:12]

nit: Comments don't add much and could be removed.
Here and twice below.

[adrian.belgun, 2016/05/17 11:05:29]

Done.

+  scoped_refptr<TrackedCallback> bind_callback_;
+  scoped_refptr<TrackedCallback> send_packet_callback_;
+  scoped_refptr<TrackedCallback> receive_packet_callback_;
+
+  // Keeps a pointer to the provided callback variable. Received packet will be
+  // copied to this variable on ready.
+  PP_Var* receive_packet_callback_var_;
+
+  // Shared memory buffers used in plugin <---> browser IPC

[bbudge, 2016/05/17 09:50:12]

same

[adrian.belgun, 2016/05/17 11:05:29]

Done.

+  std::unique_ptr<ppapi::VpnProviderSharedBuffer> send_packet_buffer_;
+  std::unique_ptr<ppapi::VpnProviderSharedBuffer> receive_packet_buffer_;
+
+  // Packet buffers

[bbudge, 2016/05/17 09:50:12]

same

[adrian.belgun, 2016/05/17 11:05:29]

Done.

+  std::queue<PP_Var> send_packets_;
+  std::queue<scoped_refptr<Var>> received_packets_;
+
+  // Connection bound state
+  bool bound_;
+
+  DISALLOW_COPY_AND_ASSIGN(VpnProviderResource);
+};
+
+}  // namespace proxy
+}  // namespace ppapi
+
+#endif  // PPAPI_PROXY_VPN_PROVIDER_RESOURCE_H_