device/devices_app/usb/device_manager_impl.h

   1 // Copyright 2015 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 #ifndef DEVICE_USB_DEVICE_MANAGER_IMPL_H_
   6 #define DEVICE_USB_DEVICE_MANAGER_IMPL_H_
   7
   8 #include <queue>
   9 #include <set>
  10
  11 #include "base/containers/scoped_ptr_map.h"
  12 #include "base/macros.h"
  13 #include "base/memory/ref_counted.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/memory/weak_ptr.h"
  16 #include "device/devices_app/usb/public/interfaces/device_manager.mojom.h"
  17 #include "device/devices_app/usb/public/interfaces/permission_provider.mojom.h"
  18 #include "third_party/mojo/src/mojo/public/cpp/bindings/array.h"
  19 #include "third_party/mojo/src/mojo/public/cpp/bindings/binding.h"
  20 #include "third_party/mojo/src/mojo/public/cpp/bindings/interface_request.h"
  21
  22 namespace base {
  23 class SequencedTaskRunner;
  24 }
  25
  26 namespace device {
  27
  28 class UsbDevice;
  29 class UsbDeviceFilter;
  30 class UsbDeviceHandle;
  31
  32 namespace usb {
  33
  34 class DeviceManagerDelegate;
  35
  36 // Implementation of the public DeviceManager interface. This interface can be
  37 // requested from the devices app located at "mojo:devices", if available.
  38 class DeviceManagerImpl : public DeviceManager {
  39  public:
  40   using DeviceList = std::vector<scoped_refptr<UsbDevice>>;
  41   using DeviceMap = std::map<std::string, scoped_refptr<device::UsbDevice>>;
  42
  43   DeviceManagerImpl(
  44       mojo::InterfaceRequest<DeviceManager> request,
  45       PermissionProviderPtr permission_provider,
  46       scoped_refptr<base::SequencedTaskRunner> service_task_runner);
  47   ~DeviceManagerImpl() override;
  48
  49   void set_connection_error_handler(const mojo::Closure& error_handler) {
  50     connection_error_handler_ = error_handler;
  51   }
  52
  53  private:
  54   class ServiceThreadHelper;
  55
  56   // DeviceManager implementation:
  57   void GetDevices(EnumerationOptionsPtr options,
  58                   const GetDevicesCallback& callback) override;
  59   void GetDeviceChanges(const GetDeviceChangesCallback& callback) override;
  60   void GetDevice(const mojo::String& guid,
  61                  mojo::InterfaceRequest<Device> device_request) override;
  62
  63   // Callbacks to handle the async responses from the underlying UsbService.
  64   void OnGetDevice(mojo::InterfaceRequest<Device> device_request,
  65                    scoped_refptr<UsbDevice> device);
  66   void OnGetDevicePermissionCheckComplete(
  67       scoped_refptr<device::UsbDevice> device,
  68       mojo::InterfaceRequest<Device> device_request,
  69       mojo::Array<mojo::String> allowed_guids);
  70   void OnGetDevices(EnumerationOptionsPtr options,
  71                     const GetDevicesCallback& callback,
  72                     const DeviceList& devices);
  73
  74   // Methods called by |helper_| when devices are added or removed.
  75   void OnDeviceAdded(scoped_refptr<device::UsbDevice> device);
  76   void OnDeviceRemoved(scoped_refptr<device::UsbDevice> device);
  77   void MaybeRunDeviceChangesCallback();
  78   void OnEnumerationPermissionCheckComplete(
  79       const DeviceMap& devices_added,
  80       const DeviceMap& devices_removed,
  81       mojo::Array<mojo::String> allowed_guids);
  82
  83   PermissionProviderPtr permission_provider_;
  84   scoped_refptr<base::SequencedTaskRunner> service_task_runner_;
  85
  86   // If there are unfinished calls to GetDeviceChanges their callbacks
  87   // are stored in |device_change_callbacks_|. Otherwise device changes
  88   // are collected in |devices_added_| and |devices_removed_| until the
  89   // next call to GetDeviceChanges.
  90   std::queue<GetDeviceChangesCallback> device_change_callbacks_;
  91   DeviceMap devices_added_;
  92   DeviceMap devices_removed_;
  93   // To ensure that GetDeviceChangesCallbacks are called in the correct order
  94   // only perform a single request to |permission_provider_| at a time.
  95   bool permission_request_pending_ = false;
  96
  97   // |helper_| is owned by the service thread and holds a weak reference
  98   // back to the device manager that created it.
  99   ServiceThreadHelper* helper_;
 100
 101   mojo::Closure connection_error_handler_;
 102
 103   mojo::Binding<DeviceManager> binding_;
 104   base::WeakPtrFactory<DeviceManagerImpl> weak_factory_;
 105
 106   DISALLOW_COPY_AND_ASSIGN(DeviceManagerImpl);
 107 };
 108
 109 }  // namespace usb
 110 }  // namespace device
 111
 112 #endif  // DEVICE_USB_DEVICE_MANAGER_IMPL_H_