src/ppapi/proxy/extensions_common_resource.cc

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ppapi/proxy/extensions_common_resource.h"
   6
   7 #include "base/bind.h"
   8 #include "base/bind_helpers.h"
   9 #include "base/logging.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/values.h"
  12 #include "ppapi/c/pp_errors.h"
  13 #include "ppapi/proxy/ppapi_messages.h"
  14 #include "ppapi/proxy/resource_message_params.h"
  15 #include "ppapi/shared_impl/tracked_callback.h"
  16 #include "ppapi/shared_impl/var_value_conversions.h"
  17
  18 namespace ppapi {
  19 namespace proxy {
  20
  21 ExtensionsCommonResource::ExtensionsCommonResource(Connection connection,
  22                                                    PP_Instance instance)
  23     : PluginResource(connection, instance) {
  24   SendCreate(RENDERER, PpapiHostMsg_ExtensionsCommon_Create());
  25   SendCreate(BROWSER, PpapiHostMsg_ExtensionsCommon_Create());
  26 }
  27
  28 ExtensionsCommonResource::~ExtensionsCommonResource() {
  29 }
  30
  31 thunk::ExtensionsCommon_API*
  32 ExtensionsCommonResource::AsExtensionsCommon_API() {
  33   return this;
  34 }
  35
  36 int32_t ExtensionsCommonResource::CallRenderer(
  37     const std::string& request_name,
  38     const std::vector<PP_Var>& input_args,
  39     const std::vector<PP_Var*>& output_args,
  40     scoped_refptr<TrackedCallback> callback) {
  41   return CommonCall(RENDERER, request_name, input_args, output_args, callback);
  42 }
  43
  44 void ExtensionsCommonResource::PostRenderer(const std::string& request_name,
  45                                             const std::vector<PP_Var>& args) {
  46   CommonPost(RENDERER, request_name, args);
  47 }
  48
  49 int32_t ExtensionsCommonResource::CallBrowser(
  50     const std::string& request_name,
  51     const std::vector<PP_Var>& input_args,
  52     const std::vector<PP_Var*>& output_args,
  53     scoped_refptr<TrackedCallback> callback) {
  54   return CommonCall(BROWSER, request_name, input_args, output_args, callback);
  55 }
  56
  57 void ExtensionsCommonResource::PostBrowser(const std::string& request_name,
  58                                            const std::vector<PP_Var>& args) {
  59   CommonPost(BROWSER, request_name, args);
  60 }
  61
  62 int32_t ExtensionsCommonResource::CommonCall(
  63     Destination dest,
  64     const std::string& request_name,
  65     const std::vector<PP_Var>& input_args,
  66     const std::vector<PP_Var*>& output_args,
  67     scoped_refptr<TrackedCallback> callback) {
  68   // TODO(yzshen): CreateValueFromVar() doesn't generate null fields for
  69   // dictionary values. That is the expected behavior for most APIs. If later we
  70   // want to support APIs that require to preserve null fields in dictionaries,
  71   // we should change the behavior to always preserve null fields at the plugin
  72   // side, and figure out whether they should be stripped at the renderer side.
  73   scoped_ptr<base::ListValue> input_args_value(
  74       CreateListValueFromVarVector(input_args));
  75   if (!input_args_value.get()) {
  76     LOG(WARNING) << "Failed to convert PP_Var input arguments.";
  77     return PP_ERROR_BADARGUMENT;
  78   }
  79
  80   PluginResource::Call<PpapiPluginMsg_ExtensionsCommon_CallReply>(
  81       dest,
  82       PpapiHostMsg_ExtensionsCommon_Call(request_name, *input_args_value),
  83       base::Bind(&ExtensionsCommonResource::OnPluginMsgCallReply,
  84                  base::Unretained(this), output_args, callback));
  85   return PP_OK_COMPLETIONPENDING;
  86 }
  87
  88 void ExtensionsCommonResource::CommonPost(Destination dest,
  89                                           const std::string& request_name,
  90                                           const std::vector<PP_Var>& args) {
  91   scoped_ptr<base::ListValue> args_value(CreateListValueFromVarVector(args));
  92   if (!args_value.get()) {
  93     LOG(WARNING) << "Failed to convert PP_Var input arguments.";
  94     return;
  95   }
  96
  97   PluginResource::Post(
  98       dest, PpapiHostMsg_ExtensionsCommon_Post(request_name, *args_value));
  99 }
 100
 101 void ExtensionsCommonResource::OnPluginMsgCallReply(
 102     const std::vector<PP_Var*>& output_args,
 103     scoped_refptr<TrackedCallback> callback,
 104     const ResourceMessageReplyParams& params,
 105     const base::ListValue& output) {
 106   // |output_args| may be invalid and shouldn't be accessed if the callback has
 107   // been called.
 108   if (!TrackedCallback::IsPending(callback))
 109     return;
 110
 111   int32_t result = params.result();
 112
 113   // If the size doesn't match, something must be really wrong.
 114   CHECK_EQ(output_args.size(), output.GetSize());
 115
 116   std::vector<PP_Var> output_vars;
 117   if (CreateVarVectorFromListValue(output, &output_vars)) {
 118     DCHECK_EQ(output_args.size(), output_vars.size());
 119     std::vector<PP_Var>::const_iterator src_iter = output_vars.begin();
 120     std::vector<PP_Var*>::const_iterator dest_iter = output_args.begin();
 121     for (; src_iter != output_vars.end() && dest_iter != output_args.end();
 122          ++src_iter, ++dest_iter) {
 123       **dest_iter = *src_iter;
 124     }
 125   } else {
 126     NOTREACHED();
 127     result = PP_ERROR_FAILED;
 128     for (std::vector<PP_Var*>::const_iterator dest_iter = output_args.begin();
 129          dest_iter != output_args.end();
 130          ++dest_iter) {
 131       **dest_iter = PP_MakeUndefined();
 132     }
 133   }
 134
 135   callback->Run(result);
 136 }
 137
 138 }  // namespace proxy
 139 }  // namespace ppapi