PPAPI: Support sending browser-hosted resources synchronously

content/browser/renderer_host/pepper/browser_ppapi_host_impl.h

 // Copyright (c) 2012 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_BROWSER_RENDERER_HOST_PEPPER_BROWSER_PPAPI_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_PEPPER_BROWSER_PPAPI_HOST_IMPL_H_
 
 #include <map>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/containers/scoped_ptr_hash_map.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "content/browser/renderer_host/pepper/content_browser_pepper_host_factory.h"
 #include "content/browser/renderer_host/pepper/ssl_context_helper.h"
 #include "content/common/content_export.h"
 #include "content/common/pepper_renderer_instance_data.h"
 #include "content/public/browser/browser_ppapi_host.h"
 #include "content/public/common/process_type.h"
 #include "ipc/message_filter.h"
 #include "ppapi/host/ppapi_host.h"
 
 #if !defined(ENABLE_PLUGINS)
 #error "Plugins should be enabled"
 #endif
 
 namespace content {
 
+class BrowserMessageFilter;
+class BrowserPpapiHostImpl;
+class PendingHostCreator {
+ public:
+  PendingHostCreator(int routing_id,
+                     int sequence_id,
+                     size_t nested_msgs_size);
+  ~PendingHostCreator();
+
+  // Adds the given resource host as a pending one. The host is remembered as
+  // host number |index|, and will ultimately be sent to the plugin to be
+  // attached to a real resource.
+  void AddPendingResourceHost(size_t index, int host_id);
+
+  bool finished() const {
+    return completed_so_far_ == host_ids_.size();
+  }
+
+  int routing_id() const { return routing_id_; }
+  int sequence_id() const { return sequence_id_; }
+  const std::vector<int>& host_ids() const { return host_ids_; }
+
+  // Swap host_ids with host_ids_, to avoid copying.
+  void TakePendingResourceHostIdsAndReset(std::vector<int>* host_ids);
+
+ private:
+  int routing_id_;
+  int sequence_id_;
+  std::vector<int> host_ids_;
+  size_t completed_so_far_;
+};
+
+// TODO(dmichael) Rename and move this to its own file.
+class InstanceData {
+ public:
+  explicit InstanceData(PP_Instance instance,
+                        BrowserPpapiHostImpl* host,
+                        IPC::Sender* renderer_sender,
+                        PepperRendererInstanceData renderer_data);
+  InstanceData(const InstanceData& instance_data);
+  ~InstanceData();
+
+  const PepperRendererInstanceData& renderer_data() const {
+    return renderer_data_;
+  }
+
+  void CreateResourceHostsFromHost(
+      int routing_id,
+      const ppapi::proxy::ResourceMessageCallParams& params,
+      const std::vector<IPC::Message>& nested_msgs);
+  void GetAllPendingResourceHosts(scoped_ptr<IPC::Message> reply_msg);
+  void RendererDidReceiveHosts(int sequence);
+ private:
+  typedef base::ScopedPtrHashMap<int, PendingHostCreator> HostCreatorMap;
+
+  void SendCompletedResourceHosts(const PendingHostCreator& creator);
+  void SendSyncReplyIfNecessary();
+  void AddPendingResourceHost(PendingHostCreator* creator,
+                              int sequence,
+                              size_t index,
+                              scoped_ptr<ppapi::host::ResourceHost> host);
+  PP_Instance instance_;
+
+  // Weak; host_ owns the InstanceData.
+  BrowserPpapiHostImpl* host_;
+
+  IPC::Sender* renderer_sender_;
+
+  // Maps sequence number to PendingHostCreator.
+  HostCreatorMap host_creator_map_;
+  size_t finished_creators_;
+  // Valid if we are building up a reply to a sync request for this instance.
+  // If null, we are in "normal" mode, where we send created hosts
+  // asynchronously. If valid, this is the reply message to send back to the
+  // renderer to unblock it. Note we only need 1, because the renderer will
+  // be blocked and unable to make another sync request until after we are
+  // finished servicing this one.
+  scoped_ptr<IPC::Message> reply_for_sync_request_;
+  PepperRendererInstanceData renderer_data_;
+
+  base::WeakPtrFactory<InstanceData> weak_ptr_factory_;
+};
+
 class CONTENT_EXPORT BrowserPpapiHostImpl : public BrowserPpapiHost {
  public:
   // The creator is responsible for calling set_plugin_process_handle as soon
   // as it is known (we start the process asynchronously so it won't be known
   // when this object is created).
   // |external_plugin| signfies that this is a proxy created for an embedder's
   // plugin, i.e. using BrowserPpapiHost::CreateExternalPluginProcess.
   BrowserPpapiHostImpl(IPC::Sender* sender,
                        const ppapi::PpapiPermissions& permissions,
                        const std::string& plugin_name,
@@ skipping 21 matching lines @@
   void set_plugin_process_handle(base::ProcessHandle handle) {
     plugin_process_handle_ = handle;
   }
 
   bool external_plugin() const { return external_plugin_; }
 
   // These two functions are notifications that an instance has been created
   // or destroyed. They allow us to maintain a mapping of PP_Instance to data
   // associated with the instance including view IDs in the browser process.
   void AddInstance(PP_Instance instance,
-                   const PepperRendererInstanceData& instance_data);
+                   const PepperRendererInstanceData& instance_data,
+                   IPC::Sender* renderer_sender);
   void DeleteInstance(PP_Instance instance);
 
+  void CreateResourceHostsFromHost(
+      int routing_id,
+      const ppapi::proxy::ResourceMessageCallParams& params,
+      PP_Instance instance,
+      const std::vector<IPC::Message>& nested_msgs);
+  void RendererDidReceiveHosts(PP_Instance instance, int sequence);
+  bool GetAllPendingResourceHosts(
+      PP_Instance instance,
+      scoped_ptr<IPC::Message> reply_msg);
+
   scoped_refptr<IPC::MessageFilter> message_filter() {
     return message_filter_;
   }
 
   const scoped_refptr<SSLContextHelper>& ssl_context_helper() const {
     return ssl_context_helper_;
   }
 
  private:
   friend class BrowserPpapiHostTest;
@@ skipping 33 matching lines @@
 
   // If true, this refers to a plugin running in the renderer process.
   bool in_process_;
 
   // If true, this is an external plugin, i.e. created by the embedder using
   // BrowserPpapiHost::CreateExternalPluginProcess.
   bool external_plugin_;
 
   scoped_refptr<SSLContextHelper> ssl_context_helper_;
 
+  // PendingHostCreator keeps track of a set of hosts that are being created
+  // for a single request message from the renderer. See the body for its
+  // definition.
+  class PendingHostCreator;
+
   // Tracks all PP_Instances in this plugin and associated renderer-related
   // data.
-  typedef std::map<PP_Instance, PepperRendererInstanceData> InstanceMap;
+  typedef std::map<PP_Instance, InstanceData> InstanceMap;
   InstanceMap instance_map_;
 
   scoped_refptr<HostMessageFilter> message_filter_;
 
   BrowserPpapiHost::OnKeepaliveCallback on_keepalive_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserPpapiHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_PEPPER_BROWSER_PPAPI_HOST_IMPL_H_