1 // Copyright (c) 2012 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/host/resource_message_handler.h" 6 7 #include "base/logging.h" 8 #include "ipc/ipc_message.h" 9 #include "ppapi/c/pp_errors.h" 10 #include "ppapi/host/host_message_context.h" 11 12 namespace ppapi { 13 namespace host { 14 ResourceMessageHandler()15ResourceMessageHandler::ResourceMessageHandler() { 16 } 17 ~ResourceMessageHandler()18ResourceMessageHandler::~ResourceMessageHandler() { 19 } 20 RunMessageHandlerAndReply(const IPC::Message & msg,HostMessageContext * context)21void ResourceMessageHandler::RunMessageHandlerAndReply( 22 const IPC::Message& msg, 23 HostMessageContext* context) { 24 ReplyMessageContext reply_context = context->MakeReplyMessageContext(); 25 // CAUTION: Handling the message may cause the destruction of this object. 26 // The message handler should ensure that if there is a chance that the 27 // object will be destroyed, PP_OK_COMPLETIONPENDING is returned as the 28 // result of the message handler. Otherwise the code below will attempt to 29 // send a reply message on a destroyed object. 30 reply_context.params.set_result(OnResourceMessageReceived(msg, context)); 31 32 // Sanity check the resource handler. Note if the result was 33 // "completion pending" the resource host may have already sent the reply. 34 if (reply_context.params.result() == PP_OK_COMPLETIONPENDING) { 35 // Message handler should have only returned a pending result if a 36 // response will be sent to the plugin. 37 DCHECK(context->params.has_callback()); 38 39 // Message handler should not have written a message to be returned if 40 // completion is pending. 41 DCHECK(context->reply_msg.type() == 0); 42 } else if (!context->params.has_callback()) { 43 // When no response is required, the message handler should not have 44 // written a message to be returned. 45 DCHECK(context->reply_msg.type() == 0); 46 47 // If there is no callback and the result of running the message handler 48 // was not PP_OK the client won't find out. 49 DLOG_IF(WARNING, reply_context.params.result() != PP_OK) 50 << "'Post' message handler failed to complete successfully."; 51 } 52 53 if (context->params.has_callback() && 54 reply_context.params.result() != PP_OK_COMPLETIONPENDING) 55 SendReply(reply_context, context->reply_msg); 56 } 57 OnResourceMessageReceived(const IPC::Message & msg,HostMessageContext * context)58int32_t ResourceMessageHandler::OnResourceMessageReceived( 59 const IPC::Message& msg, 60 HostMessageContext* context) { 61 return PP_ERROR_NOTSUPPORTED; 62 } 63 64 } // namespace host 65 } // namespace ppapi 66