IOActivityMonitor.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef IOActivityMonitor_h___

#define IOActivityMonitor_h___

#include "mozilla/dom/ChromeUtilsBinding.h"

#include "mozilla/Mutex.h"

#include "nsCOMPtr.h"

#include "nscore.h"

#include "nsClassHashtable.h"

#include "nsTHashMap.h"

#include "nsHashKeys.h"

#include "nsINamed.h"

#include "nsISupports.h"

#include "prinrval.h"

#include "prio.h"

#include "private/pprio.h"

#include <stdint.h>

namespace mozilla {

namespace dom {

class Promise;

namespace net {

#define IO_ACTIVITY_ENABLED_PREF "io.activity.enabled"

using Activities = nsTHashMap<nsCStringHashKey, dom::IOActivityDataDictionary>;

// IOActivityMonitor has several roles:

// - maintains an IOActivity per resource and updates it

// - sends a dump of the activities to a promise via RequestActivities

class IOActivityMonitor final : public nsINamed {

 public:

  IOActivityMonitor();

  NS_DECL_THREADSAFE_ISUPPORTS

  NS_DECL_NSINAMED

  // initializes and destroys the singleton

  static nsresult Init();

  static nsresult Shutdown();

  // collect amounts of data that are written/read by location

  static nsresult Read(const nsACString& location, uint32_t aAmount);

  static nsresult Write(const nsACString& location, uint32_t aAmount);

  static nsresult MonitorFile(PRFileDesc* aFd, const char* aPath);

  static nsresult MonitorSocket(PRFileDesc* aFd);

  static nsresult Read(PRFileDesc* fd, uint32_t aAmount);

  static nsresult Write(PRFileDesc* fd, uint32_t aAmount);

  static bool IsActive();

  static void RequestActivities(dom::Promise* aPromise);

 private:

  ~IOActivityMonitor() = default;

  static already_AddRefed<IOActivityMonitor> Get();

  nsresult InitInternal();

  nsresult ShutdownInternal();

  bool IncrementActivity(const nsACString& location, uint32_t aRx,

                         uint32_t aTx);

  nsresult WriteInternal(const nsACString& location, uint32_t aAmount);

  nsresult ReadInternal(const nsACString& location, uint32_t aAmount);

  void RequestActivitiesInternal(dom::Promise* aPromise);

  Activities mActivities;

  // protects mActivities accesses

  Mutex mLock MOZ_UNANNOTATED;

};

}  // namespace net

}  // namespace mozilla

#endif /* IOActivityMonitor_h___ */