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// Copyright 2015 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 "device/usb/mojo/device_manager_impl.h"
#include <stddef.h>
#include <utility>
#include "base/bind.h"
#include "base/location.h"
#include "base/memory/scoped_ptr.h"
#include "base/stl_util.h"
#include "device/core/device_client.h"
#include "device/usb/mojo/device_impl.h"
#include "device/usb/mojo/type_converters.h"
#include "device/usb/public/interfaces/device.mojom.h"
#include "device/usb/usb_device.h"
#include "device/usb/usb_device_filter.h"
#include "device/usb/usb_service.h"
#include "mojo/public/cpp/bindings/array.h"
#include "mojo/public/cpp/bindings/interface_request.h"
namespace device {
namespace usb {
namespace {
using DeviceList = DeviceManagerImpl::DeviceList;
using DeviceMap = DeviceManagerImpl::DeviceMap;
void FilterAndConvertDevicesAndThen(
const DeviceMap& devices,
const DeviceManagerImpl::GetDevicesCallback& callback,
mojo::Array<mojo::String> allowed_guids) {
mojo::Array<DeviceInfoPtr> allowed_devices(allowed_guids.size());
for (size_t i = 0; i < allowed_guids.size(); ++i) {
const auto it = devices.find(allowed_guids[i]);
DCHECK(it != devices.end());
allowed_devices[i] = DeviceInfo::From(*it->second);
}
callback.Run(std::move(allowed_devices));
}
} // namespace
// static
void DeviceManagerImpl::Create(PermissionProviderPtr permission_provider,
mojo::InterfaceRequest<DeviceManager> request) {
// The created object is owned by its binding.
new DeviceManagerImpl(std::move(permission_provider), std::move(request));
}
DeviceManagerImpl::DeviceManagerImpl(
PermissionProviderPtr permission_provider,
mojo::InterfaceRequest<DeviceManager> request)
: permission_provider_(std::move(permission_provider)),
observer_(this),
binding_(this, std::move(request)),
weak_factory_(this) {
// This object owns itself and will be destroyed if either the message pipe
// it is bound to is closed or the PermissionProvider it depends on is
// unavailable.
binding_.set_connection_error_handler([this]() { delete this; });
permission_provider_.set_connection_error_handler([this]() { delete this; });
DCHECK(DeviceClient::Get());
usb_service_ = DeviceClient::Get()->GetUsbService();
if (usb_service_)
observer_.Add(usb_service_);
}
DeviceManagerImpl::~DeviceManagerImpl() {
connection_error_handler_.Run();
}
void DeviceManagerImpl::GetDevices(EnumerationOptionsPtr options,
const GetDevicesCallback& callback) {
if (!usb_service_) {
mojo::Array<DeviceInfoPtr> no_devices;
callback.Run(std::move(no_devices));
return;
}
usb_service_->GetDevices(base::Bind(&DeviceManagerImpl::OnGetDevices,
weak_factory_.GetWeakPtr(),
base::Passed(&options), callback));
}
void DeviceManagerImpl::GetDeviceChanges(
const GetDeviceChangesCallback& callback) {
device_change_callbacks_.push(callback);
MaybeRunDeviceChangesCallback();
}
void DeviceManagerImpl::GetDevice(
const mojo::String& guid,
mojo::InterfaceRequest<Device> device_request) {
if (!usb_service_)
return;
scoped_refptr<UsbDevice> device = usb_service_->GetDevice(guid);
if (!device)
return;
mojo::Array<DeviceInfoPtr> requested_devices(1);
requested_devices[0] = DeviceInfo::From(*device);
permission_provider_->HasDevicePermission(
std::move(requested_devices),
base::Bind(&DeviceManagerImpl::OnGetDevicePermissionCheckComplete,
base::Unretained(this), device,
base::Passed(&device_request)));
}
void DeviceManagerImpl::OnGetDevicePermissionCheckComplete(
scoped_refptr<UsbDevice> device,
mojo::InterfaceRequest<Device> device_request,
mojo::Array<mojo::String> allowed_guids) {
if (allowed_guids.size() == 0)
return;
DCHECK(allowed_guids.size() == 1);
PermissionProviderPtr permission_provider;
permission_provider_->Bind(mojo::GetProxy(&permission_provider));
new DeviceImpl(device, std::move(permission_provider),
std::move(device_request));
}
void DeviceManagerImpl::OnGetDevices(EnumerationOptionsPtr options,
const GetDevicesCallback& callback,
const DeviceList& devices) {
std::vector<UsbDeviceFilter> filters;
if (options)
filters = options->filters.To<std::vector<UsbDeviceFilter>>();
std::map<std::string, scoped_refptr<UsbDevice>> device_map;
mojo::Array<DeviceInfoPtr> requested_devices;
for (const auto& device : devices) {
if (filters.empty() || UsbDeviceFilter::MatchesAny(device, filters)) {
device_map[device->guid()] = device;
requested_devices.push_back(DeviceInfo::From(*device));
}
}
permission_provider_->HasDevicePermission(
std::move(requested_devices),
base::Bind(&FilterAndConvertDevicesAndThen, device_map, callback));
}
void DeviceManagerImpl::OnDeviceAdded(scoped_refptr<UsbDevice> device) {
DCHECK(!ContainsKey(devices_removed_, device->guid()));
devices_added_[device->guid()] = device;
MaybeRunDeviceChangesCallback();
}
void DeviceManagerImpl::OnDeviceRemoved(scoped_refptr<UsbDevice> device) {
if (devices_added_.erase(device->guid()) == 0)
devices_removed_[device->guid()] = device;
MaybeRunDeviceChangesCallback();
}
void DeviceManagerImpl::WillDestroyUsbService() {
observer_.RemoveAll();
usb_service_ = nullptr;
}
void DeviceManagerImpl::MaybeRunDeviceChangesCallback() {
if (!permission_request_pending_ && !device_change_callbacks_.empty()) {
DeviceMap devices_added;
devices_added.swap(devices_added_);
DeviceMap devices_removed;
devices_removed.swap(devices_removed_);
mojo::Array<DeviceInfoPtr> requested_devices(devices_added.size() +
devices_removed.size());
{
size_t i = 0;
for (const auto& map_entry : devices_added)
requested_devices[i++] = DeviceInfo::From(*map_entry.second);
for (const auto& map_entry : devices_removed)
requested_devices[i++] = DeviceInfo::From(*map_entry.second);
}
permission_request_pending_ = true;
permission_provider_->HasDevicePermission(
std::move(requested_devices),
base::Bind(&DeviceManagerImpl::OnEnumerationPermissionCheckComplete,
base::Unretained(this), devices_added, devices_removed));
}
}
void DeviceManagerImpl::OnEnumerationPermissionCheckComplete(
const DeviceMap& devices_added,
const DeviceMap& devices_removed,
mojo::Array<mojo::String> allowed_guids) {
permission_request_pending_ = false;
if (allowed_guids.size() > 0) {
DeviceChangeNotificationPtr notification = DeviceChangeNotification::New();
notification->devices_added.resize(0);
notification->devices_removed.resize(0);
for (size_t i = 0; i < allowed_guids.size(); ++i) {
const mojo::String& guid = allowed_guids[i];
auto it = devices_added.find(guid);
if (it != devices_added.end()) {
DCHECK(!ContainsKey(devices_removed, guid));
notification->devices_added.push_back(DeviceInfo::From(*it->second));
} else {
it = devices_removed.find(guid);
DCHECK(it != devices_removed.end());
notification->devices_removed.push_back(DeviceInfo::From(*it->second));
}
}
DCHECK(!device_change_callbacks_.empty());
const GetDeviceChangesCallback& callback = device_change_callbacks_.front();
callback.Run(std::move(notification));
device_change_callbacks_.pop();
}
if (devices_added_.size() > 0 || !devices_removed_.empty())
MaybeRunDeviceChangesCallback();
}
} // namespace usb
} // namespace device
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