hal/cocoa/CocoaBattery.cpp
author Gregory Szorc <gps@mozilla.com>
Thu, 19 Feb 2015 10:58:41 -0800
changeset 245738 c97c977c92b97c9585011651b13a088f0cd4ed4f
parent 192514 5f27f634ed58d0bfaaf863abee6c3add849f8254
child 252249 ac4464790ec4896a5188fa50cfc69ae0ffeddc08
permissions -rw-r--r--
Bug 1132771 - moz.build fixups to enable execution in no config mode Various moz.build files fail to execute when a build config is not present. Many of these are due to assuming certain CONFIG entries are present. This patch attempts to fix that and enable every moz.build to be read without a build config.

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim set: sw=2 ts=2 et lcs=trail\:.,tab\:>~ : */
/* 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/. */

#import <CoreFoundation/CoreFoundation.h>
#import <IOKit/ps/IOPowerSources.h>
#import <IOKit/ps/IOPSKeys.h>

#include <mozilla/Hal.h>
#include <mozilla/dom/battery/Constants.h>
#include <mozilla/Services.h>

#include <nsIObserverService.h>
#include <nsIObserver.h>

#include <dlfcn.h>

#define IOKIT_FRAMEWORK_PATH "/System/Library/Frameworks/IOKit.framework/IOKit"

#ifndef kIOPSTimeRemainingUnknown
  #define kIOPSTimeRemainingUnknown ((CFTimeInterval)-1.0)
#endif
#ifndef kIOPSTimeRemainingUnlimited
  #define kIOPSTimeRemainingUnlimited ((CFTimeInterval)-2.0)
#endif

using namespace mozilla::dom::battery;

namespace mozilla {
namespace hal_impl {

typedef CFTimeInterval (*IOPSGetTimeRemainingEstimateFunc)(void);

class MacPowerInformationService
{
public:
  static MacPowerInformationService* GetInstance();
  static void Shutdown();
  static bool IsShuttingDown();

  void BeginListening();
  void StopListening();

  static void HandleChange(void *aContext);

  ~MacPowerInformationService();

private:
  MacPowerInformationService();

  // The reference to the runloop that is notified of power changes.
  CFRunLoopSourceRef mRunLoopSource;

  double mLevel;
  bool mCharging;
  double mRemainingTime;
  bool mShouldNotify;

  friend void GetCurrentBatteryInformation(hal::BatteryInformation* aBatteryInfo);

  static MacPowerInformationService* sInstance;
  static bool sShuttingDown;

  static void* sIOKitFramework;
  static IOPSGetTimeRemainingEstimateFunc sIOPSGetTimeRemainingEstimate;
};

void* MacPowerInformationService::sIOKitFramework;
IOPSGetTimeRemainingEstimateFunc MacPowerInformationService::sIOPSGetTimeRemainingEstimate;

/*
 * Implementation of mozilla::hal_impl::EnableBatteryNotifications,
 *                   mozilla::hal_impl::DisableBatteryNotifications,
 *               and mozilla::hal_impl::GetCurrentBatteryInformation.
 */

void
EnableBatteryNotifications()
{
  if (!MacPowerInformationService::IsShuttingDown()) {
    MacPowerInformationService::GetInstance()->BeginListening();
  }
}

void
DisableBatteryNotifications()
{
  if (!MacPowerInformationService::IsShuttingDown()) {
    MacPowerInformationService::GetInstance()->StopListening();
  }
}

void
GetCurrentBatteryInformation(hal::BatteryInformation* aBatteryInfo)
{
  MacPowerInformationService* powerService = MacPowerInformationService::GetInstance();

  aBatteryInfo->level() = powerService->mLevel;
  aBatteryInfo->charging() = powerService->mCharging;
  aBatteryInfo->remainingTime() = powerService->mRemainingTime;
}

bool MacPowerInformationService::sShuttingDown = false;

/*
 * Following is the implementation of MacPowerInformationService.
 */

MacPowerInformationService* MacPowerInformationService::sInstance = nullptr;

namespace {
struct SingletonDestroyer MOZ_FINAL : public nsIObserver
{
  NS_DECL_ISUPPORTS
  NS_DECL_NSIOBSERVER

private:
  ~SingletonDestroyer() {}
};

NS_IMPL_ISUPPORTS(SingletonDestroyer, nsIObserver)

NS_IMETHODIMP
SingletonDestroyer::Observe(nsISupports*, const char* aTopic, const char16_t*)
{
  MOZ_ASSERT(!strcmp(aTopic, "xpcom-shutdown"));
  MacPowerInformationService::Shutdown();
  return NS_OK;
}
} // anonymous namespace

/* static */ MacPowerInformationService*
MacPowerInformationService::GetInstance()
{
  if (sInstance) {
    return sInstance;
  }

  sInstance = new MacPowerInformationService();

  nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
  if (obs) {
    obs->AddObserver(new SingletonDestroyer(), "xpcom-shutdown", false);
  }

  return sInstance;
}

bool
MacPowerInformationService::IsShuttingDown()
{
  return sShuttingDown;
}

void
MacPowerInformationService::Shutdown()
{
  sShuttingDown = true;
  delete sInstance;
  sInstance = nullptr;
}

MacPowerInformationService::MacPowerInformationService()
  : mRunLoopSource(nullptr)
  , mLevel(kDefaultLevel)
  , mCharging(kDefaultCharging)
  , mRemainingTime(kDefaultRemainingTime)
  , mShouldNotify(false)
{
  // IOPSGetTimeRemainingEstimate (and the related constants) are only available
  // on 10.7, so we test for their presence at runtime.
  sIOKitFramework = dlopen(IOKIT_FRAMEWORK_PATH, RTLD_LAZY | RTLD_LOCAL);
  if (sIOKitFramework) {
    sIOPSGetTimeRemainingEstimate =
      (IOPSGetTimeRemainingEstimateFunc)dlsym(sIOKitFramework, "IOPSGetTimeRemainingEstimate");
  } else {
    sIOPSGetTimeRemainingEstimate = nullptr;
  }
}

MacPowerInformationService::~MacPowerInformationService()
{
  MOZ_ASSERT(!mRunLoopSource,
               "The observers have not been correctly removed! "
               "(StopListening should have been called)");

  if (sIOKitFramework) {
    dlclose(sIOKitFramework);
  }
}

void
MacPowerInformationService::BeginListening()
{
  // Set ourselves up to be notified about changes.
  MOZ_ASSERT(!mRunLoopSource, "IOPS Notification Loop Source already set up. "
                              "(StopListening should have been called)");

  mRunLoopSource = ::IOPSNotificationCreateRunLoopSource(HandleChange, this);
  if (mRunLoopSource) {
    ::CFRunLoopAddSource(::CFRunLoopGetCurrent(), mRunLoopSource,
                         kCFRunLoopDefaultMode);

    // Invoke our callback now so we have data if GetCurrentBatteryInformation is
    // called before a change happens.
    HandleChange(this);
    mShouldNotify = true;
  }
}

void
MacPowerInformationService::StopListening()
{
  MOZ_ASSERT(mRunLoopSource, "IOPS Notification Loop Source not set up. "
                             "(StopListening without BeginListening)");

  ::CFRunLoopRemoveSource(::CFRunLoopGetCurrent(), mRunLoopSource,
                          kCFRunLoopDefaultMode);
  mRunLoopSource = nullptr;
}

void
MacPowerInformationService::HandleChange(void* aContext) {
  MacPowerInformationService* power =
    static_cast<MacPowerInformationService*>(aContext);

  CFTypeRef data = ::IOPSCopyPowerSourcesInfo();
  if (!data) {
    ::CFRelease(data);
    return;
  }

  // Get the list of power sources.
  CFArrayRef list = ::IOPSCopyPowerSourcesList(data);
  if (!list) {
    ::CFRelease(list);
    return;
  }

  // Default values. These will be used if there are 0 sources or we can't find
  // better information.
  double level = kDefaultLevel;
  double charging = kDefaultCharging;
  double remainingTime = kDefaultRemainingTime;

  // Look for the first battery power source to give us the information we need.
  // Usually there's only 1 available, depending on current power source.
  for (CFIndex i = 0; i < ::CFArrayGetCount(list); ++i) {
    CFTypeRef source = ::CFArrayGetValueAtIndex(list, i);
    CFDictionaryRef currPowerSourceDesc = ::IOPSGetPowerSourceDescription(data, source);
    if (!currPowerSourceDesc) {
      continue;
    }

    // Get a battery level estimate. This key is required.
    int currentCapacity = 0;
    const void* cfRef = ::CFDictionaryGetValue(currPowerSourceDesc, CFSTR(kIOPSCurrentCapacityKey));
    ::CFNumberGetValue((CFNumberRef)cfRef, kCFNumberSInt32Type, &currentCapacity);

    // This key is also required.
    int maxCapacity = 0;
    cfRef = ::CFDictionaryGetValue(currPowerSourceDesc, CFSTR(kIOPSMaxCapacityKey));
    ::CFNumberGetValue((CFNumberRef)cfRef, kCFNumberSInt32Type, &maxCapacity);

    if (maxCapacity > 0) {
      level = static_cast<double>(currentCapacity)/static_cast<double>(maxCapacity);
    }

    // Find out if we're charging.
    // This key is optional, we fallback to kDefaultCharging if the current power
    // source doesn't have that info.
    if(::CFDictionaryGetValueIfPresent(currPowerSourceDesc, CFSTR(kIOPSIsChargingKey), &cfRef)) {
      charging = ::CFBooleanGetValue((CFBooleanRef)cfRef);

      // Get an estimate of how long it's going to take until we're fully charged.
      // This key is optional.
      if (charging) {
        // Default value that will be changed if we happen to find the actual
        // remaining time.
        remainingTime = level == 1.0 ? kDefaultRemainingTime : kUnknownRemainingTime;

        if (::CFDictionaryGetValueIfPresent(currPowerSourceDesc,
                CFSTR(kIOPSTimeToFullChargeKey), &cfRef)) {
          int timeToCharge;
          ::CFNumberGetValue((CFNumberRef)cfRef, kCFNumberIntType, &timeToCharge);
          if (timeToCharge != kIOPSTimeRemainingUnknown) {
            remainingTime = timeToCharge*60;
          }
        }
      } else if (sIOPSGetTimeRemainingEstimate) { // not charging
        // See if we can get a time estimate.
        CFTimeInterval estimate = sIOPSGetTimeRemainingEstimate();
        if (estimate == kIOPSTimeRemainingUnlimited || estimate == kIOPSTimeRemainingUnknown) {
          remainingTime = kUnknownRemainingTime;
        } else {
          remainingTime = estimate;
        }
      }
    }

    break;
  }

  bool isNewData = level != power->mLevel || charging != power->mCharging ||
                   remainingTime != power->mRemainingTime;

  power->mRemainingTime = remainingTime;
  power->mCharging = charging;
  power->mLevel = level;

  // Notify the observers if stuff changed.
  if (power->mShouldNotify && isNewData) {
    hal::NotifyBatteryChange(hal::BatteryInformation(power->mLevel,
                                                     power->mCharging,
                                                     power->mRemainingTime));
  }

  ::CFRelease(data);
  ::CFRelease(list);
}

} // namespace hal_impl
} // namespace mozilla