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// 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 "ppapi/proxy/device_enumeration_resource_helper.h"
#include "base/bind.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "ipc/ipc_message.h"
#include "ipc/ipc_message_macros.h"
#include "ppapi/c/pp_array_output.h"
#include "ppapi/c/pp_errors.h"
#include "ppapi/proxy/dispatch_reply_message.h"
#include "ppapi/proxy/plugin_resource.h"
#include "ppapi/proxy/ppapi_messages.h"
#include "ppapi/proxy/resource_message_params.h"
#include "ppapi/shared_impl/array_writer.h"
#include "ppapi/shared_impl/ppapi_globals.h"
#include "ppapi/shared_impl/ppb_device_ref_shared.h"
#include "ppapi/shared_impl/proxy_lock.h"
#include "ppapi/shared_impl/resource_tracker.h"
#include "ppapi/shared_impl/tracked_callback.h"
namespace ppapi {
namespace proxy {
DeviceEnumerationResourceHelper::DeviceEnumerationResourceHelper(
PluginResource* owner)
: owner_(owner),
pending_enumerate_devices_(false),
monitor_callback_id_(0),
monitor_user_data_(NULL) {
}
DeviceEnumerationResourceHelper::~DeviceEnumerationResourceHelper() {
}
int32_t DeviceEnumerationResourceHelper::EnumerateDevices(
const PP_ArrayOutput& output,
scoped_refptr<TrackedCallback> callback) {
if (pending_enumerate_devices_)
return PP_ERROR_INPROGRESS;
pending_enumerate_devices_ = true;
PpapiHostMsg_DeviceEnumeration_EnumerateDevices msg;
owner_->Call<PpapiPluginMsg_DeviceEnumeration_EnumerateDevicesReply>(
PluginResource::RENDERER, msg,
base::Bind(
&DeviceEnumerationResourceHelper::OnPluginMsgEnumerateDevicesReply,
AsWeakPtr(), output, callback));
return PP_OK_COMPLETIONPENDING;
}
int32_t DeviceEnumerationResourceHelper::EnumerateDevicesSync(
const PP_ArrayOutput& output) {
std::vector<DeviceRefData> devices;
int32_t result =
owner_->SyncCall<PpapiPluginMsg_DeviceEnumeration_EnumerateDevicesReply>(
PluginResource::RENDERER,
PpapiHostMsg_DeviceEnumeration_EnumerateDevices(),
&devices);
if (result == PP_OK)
result = WriteToArrayOutput(devices, output);
return result;
}
int32_t DeviceEnumerationResourceHelper::MonitorDeviceChange(
PP_MonitorDeviceChangeCallback callback,
void* user_data) {
monitor_callback_id_++;
monitor_user_data_ = user_data;
if (callback) {
monitor_callback_.reset(
ThreadAwareCallback<PP_MonitorDeviceChangeCallback>::Create(callback));
if (!monitor_callback_.get())
return PP_ERROR_NO_MESSAGE_LOOP;
owner_->Post(PluginResource::RENDERER,
PpapiHostMsg_DeviceEnumeration_MonitorDeviceChange(
monitor_callback_id_));
} else {
monitor_callback_.reset(NULL);
owner_->Post(PluginResource::RENDERER,
PpapiHostMsg_DeviceEnumeration_StopMonitoringDeviceChange());
}
return PP_OK;
}
bool DeviceEnumerationResourceHelper::HandleReply(
const ResourceMessageReplyParams& params,
const IPC::Message& msg) {
PPAPI_BEGIN_MESSAGE_MAP(DeviceEnumerationResourceHelper, msg)
PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL(
PpapiPluginMsg_DeviceEnumeration_NotifyDeviceChange,
OnPluginMsgNotifyDeviceChange)
PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL_UNHANDLED(return false)
PPAPI_END_MESSAGE_MAP()
return true;
}
void DeviceEnumerationResourceHelper::LastPluginRefWasDeleted() {
// Make sure that no further notifications are sent to the plugin.
monitor_callback_id_++;
monitor_callback_.reset(NULL);
monitor_user_data_ = NULL;
// There is no need to do anything with pending callback of
// EnumerateDevices(), because OnPluginMsgEnumerateDevicesReply*() will handle
// that properly.
}
void DeviceEnumerationResourceHelper::OnPluginMsgEnumerateDevicesReply(
const PP_ArrayOutput& output,
scoped_refptr<TrackedCallback> callback,
const ResourceMessageReplyParams& params,
const std::vector<DeviceRefData>& devices) {
pending_enumerate_devices_ = false;
// We shouldn't access |output| if the callback has been called, which is
// possible if the last plugin reference to the corresponding resource has
// gone away, and the callback has been aborted.
if (!TrackedCallback::IsPending(callback))
return;
int32_t result = params.result();
if (result == PP_OK)
result = WriteToArrayOutput(devices, output);
callback->Run(result);
}
void DeviceEnumerationResourceHelper::OnPluginMsgNotifyDeviceChange(
const ResourceMessageReplyParams& /* params */,
uint32_t callback_id,
const std::vector<DeviceRefData>& devices) {
if (monitor_callback_id_ != callback_id) {
// A new callback or NULL has been set.
return;
}
CHECK(monitor_callback_.get());
scoped_ptr<PP_Resource[]> elements;
uint32_t size = static_cast<uint32_t>(devices.size());
if (size > 0) {
elements.reset(new PP_Resource[size]);
for (size_t index = 0; index < size; ++index) {
PPB_DeviceRef_Shared* device_object = new PPB_DeviceRef_Shared(
OBJECT_IS_PROXY, owner_->pp_instance(), devices[index]);
elements[index] = device_object->GetReference();
}
}
monitor_callback_->RunOnTargetThread(monitor_user_data_, size,
elements.get());
for (size_t index = 0; index < size; ++index)
PpapiGlobals::Get()->GetResourceTracker()->ReleaseResource(elements[index]);
}
int32_t DeviceEnumerationResourceHelper::WriteToArrayOutput(
const std::vector<DeviceRefData>& devices,
const PP_ArrayOutput& output) {
ArrayWriter writer(output);
if (!writer.is_valid())
return PP_ERROR_BADARGUMENT;
std::vector<scoped_refptr<Resource> > device_resources;
for (size_t i = 0; i < devices.size(); ++i) {
device_resources.push_back(new PPB_DeviceRef_Shared(
OBJECT_IS_PROXY, owner_->pp_instance(), devices[i]));
}
if (!writer.StoreResourceVector(device_resources))
return PP_ERROR_FAILED;
return PP_OK;
}
} // namespace proxy
} // namespace ppapi
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