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// Copyright (c) 2011 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 "ppapi/proxy/ppb_file_system_proxy.h"
#include "base/message_loop.h"
#include "base/task.h"
#include "ppapi/c/pp_errors.h"
#include "ppapi/c/ppb_file_system.h"
#include "ppapi/proxy/enter_proxy.h"
#include "ppapi/proxy/host_dispatcher.h"
#include "ppapi/proxy/plugin_dispatcher.h"
#include "ppapi/proxy/plugin_resource.h"
#include "ppapi/proxy/ppapi_messages.h"
#include "ppapi/proxy/serialized_var.h"
#include "ppapi/thunk/enter.h"
#include "ppapi/thunk/ppb_file_system_api.h"
#include "ppapi/thunk/resource_creation_api.h"
#include "ppapi/thunk/thunk.h"
using ppapi::HostResource;
using ppapi::thunk::EnterFunctionNoLock;
using ppapi::thunk::PPB_FileSystem_API;
using ppapi::thunk::ResourceCreationAPI;
namespace pp {
namespace proxy {
namespace {
InterfaceProxy* CreateFileSystemProxy(Dispatcher* dispatcher,
const void* target_interface) {
return new PPB_FileSystem_Proxy(dispatcher, target_interface);
}
} // namespace
// This object maintains most of the state of the ref in the plugin for fast
// querying. It's all set in the constructor from the "create info" sent from
// the host.
class FileSystem : public PluginResource, public PPB_FileSystem_API {
public:
FileSystem(const HostResource& host_resource, PP_FileSystemType type);
virtual ~FileSystem();
// ResourceObjectBase override.
virtual PPB_FileSystem_API* AsPPB_FileSystem_API() OVERRIDE;
// PPB_FileSystem_APi implementation.
virtual int32_t Open(int64_t expected_size,
PP_CompletionCallback callback) OVERRIDE;
virtual PP_FileSystemType GetType() OVERRIDE;
// Called when the host has responded to our open request.
void OpenComplete(int32_t result);
private:
PP_FileSystemType type_;
bool called_open_;
PP_CompletionCallback current_open_callback_;
DISALLOW_COPY_AND_ASSIGN(FileSystem);
};
FileSystem::FileSystem(const HostResource& host_resource,
PP_FileSystemType type)
: PluginResource(host_resource),
type_(type),
called_open_(false),
current_open_callback_(PP_MakeCompletionCallback(NULL, NULL)) {
}
// TODO(brettw) this logic is duplicated with some other resource objects
// like FileChooser. It would be nice to look at all of the different resources
// that need callback tracking and design something that they can all re-use.
FileSystem::~FileSystem() {
// Ensure the callback is always fired.
if (current_open_callback_.func) {
// TODO(brettw) the callbacks at this level should be refactored with a
// more automatic tracking system like we have in the renderer.
MessageLoop::current()->PostTask(FROM_HERE, NewRunnableFunction(
current_open_callback_.func, current_open_callback_.user_data,
static_cast<int32_t>(PP_ERROR_ABORTED)));
}
}
PPB_FileSystem_API* FileSystem::AsPPB_FileSystem_API() {
return this;
}
int32_t FileSystem::Open(int64_t expected_size,
PP_CompletionCallback callback) {
if (current_open_callback_.func)
return PP_ERROR_INPROGRESS;
if (called_open_)
return PP_ERROR_FAILED;
current_open_callback_ = callback;
called_open_ = true;
GetDispatcher()->Send(new PpapiHostMsg_PPBFileSystem_Open(
INTERFACE_ID_PPB_FILE_SYSTEM, host_resource(), expected_size));
return PP_OK_COMPLETIONPENDING;
}
PP_FileSystemType FileSystem::GetType() {
return type_;
}
void FileSystem::OpenComplete(int32_t result) {
PP_RunAndClearCompletionCallback(¤t_open_callback_, result);
}
PPB_FileSystem_Proxy::PPB_FileSystem_Proxy(Dispatcher* dispatcher,
const void* target_interface)
: InterfaceProxy(dispatcher, target_interface),
callback_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
}
PPB_FileSystem_Proxy::~PPB_FileSystem_Proxy() {
}
const InterfaceProxy::Info* PPB_FileSystem_Proxy::GetInfo() {
static const Info info = {
::ppapi::thunk::GetPPB_FileSystem_Thunk(),
PPB_FILESYSTEM_INTERFACE,
INTERFACE_ID_PPB_FILE_SYSTEM,
false,
&CreateFileSystemProxy,
};
return &info;
}
// static
PP_Resource PPB_FileSystem_Proxy::CreateProxyResource(
PP_Instance instance,
PP_FileSystemType type) {
PluginDispatcher* dispatcher = PluginDispatcher::GetForInstance(instance);
if (!dispatcher)
return PP_ERROR_BADARGUMENT;
HostResource result;
dispatcher->Send(new PpapiHostMsg_PPBFileSystem_Create(
INTERFACE_ID_PPB_FILE_SYSTEM, instance, type, &result));
if (result.is_null())
return 0;
return PluginResourceTracker::GetInstance()->AddResource(
new FileSystem(result, type));
}
bool PPB_FileSystem_Proxy::OnMessageReceived(const IPC::Message& msg) {
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(PPB_FileSystem_Proxy, msg)
IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileSystem_Create, OnMsgCreate)
IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileSystem_Open, OnMsgOpen)
IPC_MESSAGE_HANDLER(PpapiMsg_PPBFileSystem_OpenComplete, OnMsgOpenComplete)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
return handled;
}
void PPB_FileSystem_Proxy::OnMsgCreate(PP_Instance instance,
int type,
HostResource* result) {
EnterFunctionNoLock<ResourceCreationAPI> enter(instance, true);
if (enter.failed())
return;
PP_Resource resource = enter.functions()->CreateFileSystem(
instance, static_cast<PP_FileSystemType>(type));
if (!resource)
return; // CreateInfo default constructor initializes to 0.
result->SetHostResource(instance, resource);
}
void PPB_FileSystem_Proxy::OnMsgOpen(const HostResource& host_resource,
int64_t expected_size) {
EnterHostFromHostResourceForceCallback<PPB_FileSystem_API> enter(
host_resource, callback_factory_,
&PPB_FileSystem_Proxy::OpenCompleteInHost, host_resource);
if (enter.succeeded())
enter.SetResult(enter.object()->Open(expected_size, enter.callback()));
}
// Called in the plugin to handle the open callback.
void PPB_FileSystem_Proxy::OnMsgOpenComplete(const HostResource& host_resource,
int32_t result) {
EnterPluginFromHostResource<PPB_FileSystem_API> enter(host_resource);
if (enter.succeeded())
static_cast<FileSystem*>(enter.object())->OpenComplete(result);
}
void PPB_FileSystem_Proxy::OpenCompleteInHost(
int32_t result,
const HostResource& host_resource) {
dispatcher()->Send(new PpapiMsg_PPBFileSystem_OpenComplete(
INTERFACE_ID_PPB_FILE_SYSTEM, host_resource, result));
}
} // namespace proxy
} // namespace pp
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