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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 "content/renderer/pepper/pepper_device_enumeration_host_helper.h"
#include "base/bind.h"
#include "base/logging.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop/message_loop.h"
#include "ipc/ipc_message.h"
#include "ppapi/c/pp_errors.h"
#include "ppapi/host/dispatch_host_message.h"
#include "ppapi/host/host_message_context.h"
#include "ppapi/host/ppapi_host.h"
#include "ppapi/host/resource_host.h"
#include "ppapi/proxy/ppapi_messages.h"
#include "ppapi/shared_impl/ppb_device_ref_shared.h"
using ppapi::host::HostMessageContext;
namespace content {
// Makes sure that StopEnumerateDevices() is called for each EnumerateDevices().
class PepperDeviceEnumerationHostHelper::ScopedRequest
: public base::SupportsWeakPtr<ScopedRequest> {
public:
// |owner| must outlive this object.
ScopedRequest(
PepperDeviceEnumerationHostHelper* owner,
const Delegate::EnumerateDevicesCallback& callback)
: owner_(owner),
callback_(callback),
requested_(false),
request_id_(0),
sync_call_(false) {
if (!owner_->document_url_.is_valid())
return;
requested_ = true;
// Note that the callback passed into
// PepperDeviceEnumerationHostHelper::Delegate::EnumerateDevices() may be
// called synchronously. In that case, |request_id_| hasn't been updated
// when the callback is called. Moreover, |callback| may destroy this
// object. So we don't pass in |callback| directly. Instead, we use
// EnumerateDevicesCallbackBody() to ensure that we always call |callback|
// asynchronously.
sync_call_ = true;
request_id_ = owner_->delegate_->EnumerateDevices(
owner_->device_type_,
owner_->document_url_,
base::Bind(&ScopedRequest::EnumerateDevicesCallbackBody, AsWeakPtr()));
sync_call_ = false;
}
~ScopedRequest() {
if (requested_) {
owner_->delegate_->StopEnumerateDevices(request_id_);
}
}
bool requested() const { return requested_; }
private:
void EnumerateDevicesCallbackBody(
int request_id,
const std::vector<ppapi::DeviceRefData>& devices) {
if (sync_call_) {
base::MessageLoop::current()->PostTask(
FROM_HERE,
base::Bind(&ScopedRequest::EnumerateDevicesCallbackBody,
AsWeakPtr(),
request_id,
devices));
} else {
DCHECK_EQ(request_id_, request_id);
callback_.Run(request_id, devices);
// This object may have been destroyed at this point.
}
}
PepperDeviceEnumerationHostHelper* owner_;
PepperDeviceEnumerationHostHelper::Delegate::EnumerateDevicesCallback
callback_;
bool requested_;
int request_id_;
bool sync_call_;
DISALLOW_COPY_AND_ASSIGN(ScopedRequest);
};
PepperDeviceEnumerationHostHelper::PepperDeviceEnumerationHostHelper(
ppapi::host::ResourceHost* resource_host,
Delegate* delegate,
PP_DeviceType_Dev device_type,
const GURL& document_url)
: resource_host_(resource_host),
delegate_(delegate),
device_type_(device_type),
document_url_(document_url) {
}
PepperDeviceEnumerationHostHelper::~PepperDeviceEnumerationHostHelper() {
}
bool PepperDeviceEnumerationHostHelper::HandleResourceMessage(
const IPC::Message& msg,
HostMessageContext* context,
int32_t* result) {
bool return_value = false;
*result = InternalHandleResourceMessage(msg, context, &return_value);
return return_value;
}
int32_t PepperDeviceEnumerationHostHelper::InternalHandleResourceMessage(
const IPC::Message& msg,
HostMessageContext* context,
bool* handled) {
*handled = true;
IPC_BEGIN_MESSAGE_MAP(PepperDeviceEnumerationHostHelper, msg)
PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(
PpapiHostMsg_DeviceEnumeration_EnumerateDevices, OnEnumerateDevices)
PPAPI_DISPATCH_HOST_RESOURCE_CALL(
PpapiHostMsg_DeviceEnumeration_MonitorDeviceChange,
OnMonitorDeviceChange)
PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(
PpapiHostMsg_DeviceEnumeration_StopMonitoringDeviceChange,
OnStopMonitoringDeviceChange)
IPC_END_MESSAGE_MAP()
*handled = false;
return PP_ERROR_FAILED;
}
int32_t PepperDeviceEnumerationHostHelper::OnEnumerateDevices(
HostMessageContext* context) {
if (enumerate_devices_context_)
return PP_ERROR_INPROGRESS;
enumerate_.reset(new ScopedRequest(
this,
base::Bind(&PepperDeviceEnumerationHostHelper::OnEnumerateDevicesComplete,
base::Unretained(this))));
if (!enumerate_->requested())
return PP_ERROR_FAILED;
enumerate_devices_context_.reset(
new ppapi::host::ReplyMessageContext(context->MakeReplyMessageContext()));
return PP_OK_COMPLETIONPENDING;
}
int32_t PepperDeviceEnumerationHostHelper::OnMonitorDeviceChange(
HostMessageContext* /* context */,
uint32_t callback_id) {
monitor_.reset(new ScopedRequest(
this,
base::Bind(&PepperDeviceEnumerationHostHelper::OnNotifyDeviceChange,
base::Unretained(this), callback_id)));
return monitor_->requested() ? PP_OK : PP_ERROR_FAILED;
}
int32_t PepperDeviceEnumerationHostHelper::OnStopMonitoringDeviceChange(
HostMessageContext* /* context */) {
monitor_.reset(NULL);
return PP_OK;
}
void PepperDeviceEnumerationHostHelper::OnEnumerateDevicesComplete(
int /* request_id */,
const std::vector<ppapi::DeviceRefData>& devices) {
DCHECK(enumerate_devices_context_.get());
enumerate_.reset(NULL);
enumerate_devices_context_->params.set_result(PP_OK);
resource_host_->host()->SendReply(
*enumerate_devices_context_,
PpapiPluginMsg_DeviceEnumeration_EnumerateDevicesReply(devices));
enumerate_devices_context_.reset();
}
void PepperDeviceEnumerationHostHelper::OnNotifyDeviceChange(
uint32_t callback_id,
int /* request_id */,
const std::vector<ppapi::DeviceRefData>& devices) {
resource_host_->host()->SendUnsolicitedReply(
resource_host_->pp_resource(),
PpapiPluginMsg_DeviceEnumeration_NotifyDeviceChange(
callback_id,
devices));
}
} // namespace content
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