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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.
// RemovableDeviceNotificationsLinux listens for mount point changes, notifies
// the SystemMonitor about the addition and deletion of media devices, and
// answers queries about mounted devices.
#ifndef CHROME_BROWSER_SYSTEM_MONITOR_REMOVABLE_DEVICE_NOTIFICATIONS_LINUX_H_
#define CHROME_BROWSER_SYSTEM_MONITOR_REMOVABLE_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 "base/system_monitor/system_monitor.h"
#include "content/public/browser/browser_thread.h"
class FilePath;
// Gets device information given a |device_path|. On success, fills in
// |unique_id|, |name|, and |removable|.
typedef void (*GetDeviceInfoFunc)(const FilePath& device_path,
std::string* unique_id, string16* name,
bool* removable);
namespace chrome {
class RemovableDeviceNotificationsLinux;
typedef RemovableDeviceNotificationsLinux RemovableDeviceNotifications;
class RemovableDeviceNotificationsLinux
: public base::RefCountedThreadSafe<RemovableDeviceNotificationsLinux,
content::BrowserThread::DeleteOnFileThread> {
public:
// Should only be called by browser start up code. Use GetInstance() instead.
explicit RemovableDeviceNotificationsLinux(const FilePath& path);
static RemovableDeviceNotificationsLinux* GetInstance();
// Must be called for RemovableDeviceNotificationsLinux to work.
void Init();
// Finds the device that contains |path| and populates |device_info|.
// Returns false if unable to find the device.
bool GetDeviceInfoForPath(
const FilePath& path,
base::SystemMonitor::RemovableStorageInfo* device_info) const;
protected:
// Only for use in unit tests.
RemovableDeviceNotificationsLinux(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 ~RemovableDeviceNotificationsLinux();
virtual void OnFilePathChanged(const FilePath& path, bool error);
private:
friend class base::RefCountedThreadSafe<RemovableDeviceNotificationsLinux>;
friend class base::DeleteHelper<RemovableDeviceNotificationsLinux>;
friend struct content::BrowserThread::DeleteOnThread<
content::BrowserThread::FILE>;
// Structure to save mounted device information such as device path and unique
// identifier.
struct MountPointInfo {
FilePath mount_device;
std::string device_id;
string16 device_name;
};
// Mapping of mount points to MountPointInfo.
typedef std::map<FilePath, MountPointInfo> MountMap;
// (mount point, priority)
// For devices that are mounted to multiple mount points, this helps us track
// which one we've notified system monitor about.
typedef std::map<FilePath, bool> ReferencedMountPoint;
// (mount device, map of known mount points)
// For each mount device, track the places it is mounted and which one (if
// any) we have notified system monitor about.
typedef std::map<FilePath, ReferencedMountPoint> MountPriorityMap;
// Do initialization on the File Thread.
void InitOnFileThread();
// Parses mtab file and find all changes.
void UpdateMtab();
// Adds |mount_device| as mounted on |mount_point|. If the device is a new
// device SystemMonitor is notified.
void AddNewMount(const FilePath& mount_device, const FilePath& mount_point);
// 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_;
// 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_;
// 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_;
// Because a device can be mounted to multiple places, we only want to
// notify about one of them. If (and only if) that one is unmounted, we need
// to notify about it's departure and notify about another one of it's mount
// points.
MountPriorityMap mount_priority_map_;
DISALLOW_COPY_AND_ASSIGN(RemovableDeviceNotificationsLinux);
};
} // namespace chrome
#endif // CHROME_BROWSER_SYSTEM_MONITOR_REMOVABLE_DEVICE_NOTIFICATIONS_LINUX_H_
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