WebSocket Pepper API: SRPC proxy implementation

ppapi/native_client/src/shared/ppapi_proxy/browser_callback.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
 #include "native_client/src/shared/ppapi_proxy/browser_callback.h"
 
 #include <new>
 
 #include "native_client/src/include/nacl_macros.h"
 #include "native_client/src/include/nacl_scoped_ptr.h"
 #include "native_client/src/shared/platform/nacl_check.h"
 #include "native_client/src/shared/ppapi_proxy/browser_globals.h"
 #include "native_client/src/shared/ppapi_proxy/browser_ppp.h"
+#include "native_client/src/shared/ppapi_proxy/object_serialize.h"
 #include "native_client/src/shared/ppapi_proxy/utility.h"
 #include "native_client/src/shared/srpc/nacl_srpc.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "native_client/src/trusted/plugin/plugin.h"
 #include "srpcgen/ppp_rpc.h"
 
 namespace ppapi_proxy {
 
 namespace {
 
@@ skipping 18 matching lines @@
 // depending on how the callback operation was initiated, and
 // |check_result_func| provides an abstraction to the semantics.
 // |get_size_read_func| is a pointer to a function used to get the
 // number of bytes read.  The way the number of bytes read
 // retrieved/calculated may be different depending on how the callback was
 // initiated, and |get_size_read_func| provides the indirection.
 struct RemoteCallbackInfo {
   NaClSrpcChannel* srpc_channel;
   int32_t callback_id;
   char* read_buffer;
+  PP_Var read_var;
   CheckResultFunc check_result_func;
   GetReadSizeFunc get_size_read_func;
 };
 
 // Calls the remote implementation of a callback on the plugin side.
 // Implements a PP_CompletionCallback_Func type that can be used along with an
 // instance of a RemoteCallbackInfo as |user_data| to provide a
 // PP_CompletionCallback to browser functions.
 //
 // |remote_callback| is a pointer to a RemoteCallbackInfo,
@@ skipping 14 matching lines @@
   if (LookupBrowserPppForInstance(instance) == NULL) {
     DebugPrintf("RunRemoteCallback: proxy=NULL\n", result);
     return;
   }
 
   nacl_abi_size_t read_buffer_size = 0;
   CheckResultFunc check_result_func = remote_callback->check_result_func;
   GetReadSizeFunc get_size_read_func = remote_callback->get_size_read_func;
   if ((*check_result_func)(result) && remote_callback->read_buffer != NULL)
     read_buffer_size = (*get_size_read_func)(result);
+  if (remote_callback->read_var.type != PP_VARTYPE_NULL) {
+    read_buffer_size = kMaxReturnVarSize;
+    read_buffer.reset(
+        Serialize(&remote_callback->read_var, 1, &read_buffer_size));
+  }
 
   NaClSrpcError srpc_result =
       CompletionCallbackRpcClient::RunCompletionCallback(
           remote_callback->srpc_channel,
           remote_callback->callback_id,
           result,
           read_buffer_size,
           read_buffer.get());
   DebugPrintf("RunRemoteCallback: %s\n",
               NaClSrpcErrorString(srpc_result));
   if (srpc_result == NACL_SRPC_RESULT_INTERNAL)
     CleanUpAfterDeadNexe(instance);
 }
 
 }  // namespace
 
 // Builds a RemoteCallbackInfo and returns PP_CompletionCallback corresponding
 // to RunRemoteCallback or NULL on failure.
 struct PP_CompletionCallback MakeRemoteCompletionCallback(
     NaClSrpcChannel* srpc_channel,
     int32_t callback_id,
     int32_t bytes_to_read,
     char** buffer,
+    PP_Var** var,
     CheckResultFunc check_result_func,
     GetReadSizeFunc get_size_read_func) {
-  RemoteCallbackInfo* remote_callback = new(std::nothrow) RemoteCallbackInfo;
-  if (remote_callback == NULL)  // new failed.
+  nacl::scoped_ptr<RemoteCallbackInfo> remote_callback(
+      new(std::nothrow) RemoteCallbackInfo);
+  if (remote_callback.get() == NULL)  // new failed.
     return PP_BlockUntilComplete();
   remote_callback->srpc_channel = srpc_channel;
   remote_callback->callback_id = callback_id;
   remote_callback->read_buffer = NULL;
+  remote_callback->read_var = PP_MakeNull();
   remote_callback->check_result_func = check_result_func;
   remote_callback->get_size_read_func = get_size_read_func;
 
   if (bytes_to_read > 0 && buffer != NULL) {
     *buffer = new(std::nothrow) char[bytes_to_read];
     if (*buffer == NULL)  // new failed.
       return PP_BlockUntilComplete();
     remote_callback->read_buffer = *buffer;
   }
+  if (var)
+    *var = &remote_callback->read_var;
 
   return PP_MakeOptionalCompletionCallback(
-      RunRemoteCallback, remote_callback);
+      RunRemoteCallback, remote_callback.release());
 }
 
 struct PP_CompletionCallback MakeRemoteCompletionCallback(
+    NaClSrpcChannel* srpc_channel,
+    int32_t callback_id,
+    int32_t bytes_to_read,
+    char** buffer,
+    CheckResultFunc check_result_func,
+    GetReadSizeFunc get_size_read_func) {
+  return MakeRemoteCompletionCallback(srpc_channel, callback_id, bytes_to_read,
+                                      buffer, NULL, check_result_func,
+                                      get_size_read_func);
+}
+
+struct PP_CompletionCallback MakeRemoteCompletionCallback(
     NaClSrpcChannel* srpc_channel,
     int32_t callback_id,
     int32_t bytes_to_read,
     char** buffer) {
   return MakeRemoteCompletionCallback(srpc_channel, callback_id, bytes_to_read,
                                       buffer, BytesWereRead, CastToNaClAbiSize);
 }
 
 struct PP_CompletionCallback MakeRemoteCompletionCallback(
     NaClSrpcChannel* srpc_channel,
+    int32_t callback_id,
+    PP_Var** var) {
+  return MakeRemoteCompletionCallback(srpc_channel, callback_id, 0, NULL, var,
+                                      BytesWereRead, CastToNaClAbiSize);
+}
+
+struct PP_CompletionCallback MakeRemoteCompletionCallback(
+    NaClSrpcChannel* srpc_channel,
     int32_t callback_id) {
   return MakeRemoteCompletionCallback(srpc_channel, callback_id, 0, NULL);
 }
 
 void DeleteRemoteCallbackInfo(struct PP_CompletionCallback callback) {
   nacl::scoped_ptr<RemoteCallbackInfo> remote_callback(
       reinterpret_cast<RemoteCallbackInfo*>(callback.user_data));
   nacl::scoped_array<char> read_buffer(remote_callback->read_buffer);
 }
 
 }  // namespace ppapi_proxy