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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.
// MediaDeviceNotificationsLinux listens for mount point changes and notifies
// the SystemMonitor about the addition and deletion of media devices.
#ifndef CHROME_BROWSER_MEDIA_GALLERY_MEDIA_DEVICE_NOTIFICATIONS_LINUX_H_
#define CHROME_BROWSER_MEDIA_GALLERY_MEDIA_DEVICE_NOTIFICATIONS_LINUX_H_
#if defined(OS_CHROMEOS)
#error "Use the ChromeOS-specific implementation instead."
#endif
#include <map>
#include <set>
#include <string>
#include <utility>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/files/file_path_watcher.h"
#include "base/memory/ref_counted.h"
#include "content/public/browser/browser_thread.h"
class FilePath;
// Gets the media device information given a |device_path|. On success,
// returns true and fills in |name| and |id|.
typedef bool (*GetDeviceInfoFunc)(const std::string& device_path,
std::string* id,
string16* name);
namespace chrome {
class MediaDeviceNotificationsLinux
: public base::RefCountedThreadSafe<MediaDeviceNotificationsLinux,
content::BrowserThread::DeleteOnFileThread> {
public:
explicit MediaDeviceNotificationsLinux(const FilePath& path);
// Must be called for MediaDeviceNotificationsLinux to work.
void Init();
protected:
// Only for use in unit tests.
MediaDeviceNotificationsLinux(const FilePath& path,
GetDeviceInfoFunc getDeviceInfo);
// Avoids code deleting the object while there are references to it.
// Aside from the base::RefCountedThreadSafe friend class, and derived
// classes, any attempts to call this dtor will result in a compile-time
// error.
virtual ~MediaDeviceNotificationsLinux();
virtual void OnFilePathChanged(const FilePath& path, bool error);
private:
friend class base::RefCountedThreadSafe<MediaDeviceNotificationsLinux>;
friend class base::DeleteHelper<MediaDeviceNotificationsLinux>;
friend struct content::BrowserThread::DeleteOnThread<
content::BrowserThread::FILE>;
// Structure to save mounted device information such as device path and unique
// identifier.
struct MountDeviceAndId {
std::string mount_device;
std::string device_id;
};
// Mapping of mount points to MountDeviceAndId.
typedef std::map<std::string, MountDeviceAndId> MountMap;
// (mount point, mount device)
// Helper Map to get new entries from mtab file.
typedef std::map<std::string, std::string> MountPointDeviceMap;
// Do initialization on the File Thread.
void InitOnFileThread();
// Parses mtab file and find all changes.
void UpdateMtab();
// Reads mtab file entries into |mtab|.
void ReadMtab(MountPointDeviceMap* mtab);
// Checks and adds |mount_device| as media device given the |mount_point|.
void CheckAndAddMediaDevice(const std::string& mount_device,
const std::string& mount_point);
// Removes media device with a given device id.
void RemoveOldDevice(const std::string& device_id);
// Whether Init() has been called or not.
bool initialized_;
// Mtab file that lists the mount points.
const FilePath mtab_path_;
// Watcher for |mtab_path_|.
base::files::FilePathWatcher file_watcher_;
// Mapping of relevant mount points and their corresponding mount devices.
// Keep in mind on Linux, a device can be mounted at multiple mount points,
// and multiple devices can be mounted at a mount point.
MountMap mount_info_map_;
// Set of known file systems that we care about.
std::set<std::string> known_file_systems_;
// Function handler to get device information. This is useful to set a mock
// handler for unit testing.
GetDeviceInfoFunc get_device_info_func_;
DISALLOW_COPY_AND_ASSIGN(MediaDeviceNotificationsLinux);
};
} // namespace chrome
#endif // CHROME_BROWSER_MEDIA_GALLERY_MEDIA_DEVICE_NOTIFICATIONS_LINUX_H_
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