chromeos: Add power supply info reading capability

chrome/browser/chromeos/cros/power_library.cc

 // Copyright (c) 2011 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.
 
 #include "chrome/browser/chromeos/cros/power_library.h"
 
 #include <algorithm>
+#include <inttypes.h>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/observer_list.h"
+#include "base/stringprintf.h"
 #include "base/time.h"
 #include "base/timer.h"
 #include "chrome/browser/chromeos/cros/cros_library.h"
+#include "chrome/browser/chromeos/dbus/dbus_thread_manager.h"
 #include "content/browser/browser_thread.h"
 #include "third_party/cros/chromeos_power.h"
 #include "third_party/cros/chromeos_resume.h"
 
 namespace chromeos {
 
+const std::string& PowerSupplyStatus::ToString() const {
+  static std::string result = "";
+  base::StringAppendF(&result,
+                      "line_power_on = %s ",
+                      line_power_on ? "true" : "false");
+  base::StringAppendF(&result,
+                      "battery_is_present = %s ",
+                      battery_is_present ? "true" : "false");
+  base::StringAppendF(&result,
+                      "battery_is_full = %s ",
+                      battery_is_full ? "true" : "false");
+  base::StringAppendF(&result,
+                      "battery_percentage = %f ",
+                      battery_percentage);
+  base::StringAppendF(&result,
+                      "battery_seconds_to_empty = %"PRId64" ",
+                      battery_seconds_to_empty);
+  base::StringAppendF(&result,
+                      "battery_seconds_to_full = %"PRId64" ",
+                      battery_seconds_to_full);
+  return result;
+}
+
 class PowerLibraryImpl : public PowerLibrary {
  public:
   PowerLibraryImpl()
-      : power_status_connection_(NULL),
-        resume_status_connection_(NULL) {
+      : resume_status_connection_(NULL) {
   }
 
   virtual ~PowerLibraryImpl() {
-    if (power_status_connection_) {
-      chromeos::DisconnectPowerStatus(power_status_connection_);
-      power_status_connection_ = NULL;
-    }
     if (resume_status_connection_) {
       chromeos::DisconnectResume(resume_status_connection_);
       resume_status_connection_ = NULL;
     }
   }
 
   // Begin PowerLibrary implementation.
   virtual void Init() OVERRIDE {
     DCHECK(CrosLibrary::Get()->libcros_loaded());
-    power_status_connection_ =
-        chromeos::MonitorPowerStatus(&PowerStatusChangedHandler, this);
     resume_status_connection_ =
         chromeos::MonitorResume(&SystemResumedHandler, this);
   }
 
   virtual void AddObserver(Observer* observer) OVERRIDE {
     observers_.AddObserver(observer);
   }
 
   virtual void RemoveObserver(Observer* observer) OVERRIDE {
     observers_.RemoveObserver(observer);
   }
 
   virtual void CalculateIdleTime(CalculateIdleTimeCallback* callback) OVERRIDE {
     // TODO(sidor): Examine if it's really a good idea to use void* as a second
     // argument.
     chromeos::GetIdleTime(&GetIdleTimeCallback, callback);
   }
 
   virtual void EnableScreenLock(bool enable) OVERRIDE {
-    // Called when the screen preference is changed, which should always
-    // run on UI thread.
-    DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-    // Post the task to FILE thread as chromeos::EnableScreenLock
+    // Make sure we run on FILE thread because chromeos::EnableScreenLock
     // would write power manager config file to disk.
-    BrowserThread::PostTask(
-        BrowserThread::FILE, FROM_HERE,
-        base::Bind(&PowerLibraryImpl::DoEnableScreenLock, enable));
+    DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
+
+    chromeos::EnableScreenLock(enable);
   }
 
   virtual void RequestRestart() OVERRIDE {
     chromeos::RequestRestart();
   }
 
   virtual void RequestShutdown() OVERRIDE {
     chromeos::RequestShutdown();
   }
 
   virtual void RequestStatusUpdate() OVERRIDE {
     // TODO(stevenjb): chromeos::RetrievePowerInformation has been deprecated;
     // we should add a mechanism to immediately request an update, probably
     // when we migrate the DBus code from libcros to here.
   }
 
+  // PowerManagerClient::Observer implementation.
+  virtual void UpdatePowerStatus(const PowerStatus& power_status) OVERRIDE {
+    // Make this is being called from UI thread.
+    DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+    // TODO(sque): this is a temporary copy-over from libcros.  Soon libcros
+    // will be removed and this will not be necessary.
+    PowerSupplyStatus status;
+    status.line_power_on            = power_status.line_power_on;
+    status.battery_is_present       = power_status.battery_is_present;
+    status.battery_is_full          =
+        (power_status.battery_state == chromeos::BATTERY_STATE_FULLY_CHARGED);
+    status.battery_seconds_to_empty = power_status.battery_time_to_empty;
+    status.battery_seconds_to_full  = power_status.battery_time_to_full;
+    status.battery_percentage       = power_status.battery_percentage;
+
+    VLOG(1) << "Power status: " << status.ToString();
+    FOR_EACH_OBSERVER(Observer, observers_, PowerChanged(status));

[satorux1, 2011/10/27 21:09:21]

The method is essentially redirecting UpdatePowerStatus(status) to
PowerChanged(status). 

I think we can get rid of this redirection by changing the clients of
PowerLibrary to directly use PowerManagerClient, and that'd be simpler.

[Simon Que, 2011/10/27 22:46:20]

Done.

+  }
+
   // End PowerLibrary implementation.
 
  private:
   static void DoEnableScreenLock(bool enable) {
     chromeos::EnableScreenLock(enable);
   }
 
   static void GetIdleTimeCallback(void* object,
                                  int64_t time_idle_ms,
                                  bool success) {
     DCHECK(object);
     CalculateIdleTimeCallback* notify =
         static_cast<CalculateIdleTimeCallback*>(object);
     if (success) {
       notify->Run(time_idle_ms/1000);
     } else {
       LOG(ERROR) << "Power manager failed to calculate idle time.";
       notify->Run(-1);
     }
     delete notify;
   }
 
-  static void PowerStatusChangedHandler(
-      void* object, const chromeos::PowerStatus& power_status) {
-    // TODO(sque): this is a temporary copy-over from libcros.  Soon libcros
-    // will be removed and this will not be necessary.
-    PowerSupplyStatus status;
-    status.line_power_on         = power_status.line_power_on;
-    status.battery_is_present    = power_status.battery_is_present;
-    status.battery_is_full       =
-        (power_status.battery_state == chromeos::BATTERY_STATE_FULLY_CHARGED);
-    status.battery_seconds_to_empty = power_status.battery_time_to_empty;
-    status.battery_seconds_to_full  = power_status.battery_time_to_full;
-    status.battery_percentage    = power_status.battery_percentage;
-
-    PowerLibraryImpl* power = static_cast<PowerLibraryImpl*>(object);
-    power->UpdatePowerStatus(status);
-  }
-
   static void SystemResumedHandler(void* object) {
     PowerLibraryImpl* power = static_cast<PowerLibraryImpl*>(object);
     power->SystemResumed();
   }
 
-  void UpdatePowerStatus(const PowerSupplyStatus& status) {
-    // Called from PowerStatusChangedHandler, a libcros callback which
-    // should always run on UI thread.
-    DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-
-    DVLOG(1) << "Power line_power_on = " << status.line_power_on
-             << " percentage = " << status.battery_percentage
-             << " seconds_to_empty = " << status.battery_seconds_to_empty
-             << " seconds_to_full = " << status.battery_seconds_to_full;
-    FOR_EACH_OBSERVER(Observer, observers_, PowerChanged(status));
-  }
-
   void SystemResumed() {
     // Called from SystemResumedHandler, a libcros callback which should
     // always run on UI thread.
     DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
     FOR_EACH_OBSERVER(Observer, observers_, SystemResumed());
   }
 
   ObserverList<Observer> observers_;
 
-  // A reference to the power battery API, to allow callbacks when the battery
-  // status changes.
-  chromeos::PowerStatusConnection power_status_connection_;
-
   // A reference to the resume alerts.
   chromeos::ResumeConnection resume_status_connection_;
 
   DISALLOW_COPY_AND_ASSIGN(PowerLibraryImpl);
 };
 
 // The stub implementation runs the battery up and down, pausing at the
 // fully charged and fully depleted states.
 class PowerLibraryStubImpl : public PowerLibrary {
  public:
@@ skipping 31 matching lines @@
       timer_.Start(
           FROM_HERE,
           base::TimeDelta::FromMilliseconds(100),
           this,
           &PowerLibraryStubImpl::Update);
     } else {
       timer_.Stop();
     }
   }
 
+  virtual void UpdatePowerStatus(const PowerStatus& status) OVERRIDE {
+  }
+
   // End PowerLibrary implementation.
 
  private:
   void Update() {
     // We pause at 0 and 100% so that it's easier to check those conditions.
     if (pause_count_ > 1) {
       pause_count_--;
       return;
     }
 
@@ skipping 32 matching lines @@
   PowerLibrary* impl;
   if (stub)
     impl = new PowerLibraryStubImpl();
   else
     impl = new PowerLibraryImpl();
   impl->Init();
   return impl;
 }
 
 }  // namespace chromeos