1 //
2 // Copyright (C) 2014 The Android Open Source Project
3 //
4 // Licensed under the Apache License, Version 2.0 (the "License");
5 // you may not use this file except in compliance with the License.
6 // You may obtain a copy of the License at
7 //
8 //      http://www.apache.org/licenses/LICENSE-2.0
9 //
10 // Unless required by applicable law or agreed to in writing, software
11 // distributed under the License is distributed on an "AS IS" BASIS,
12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 // See the License for the specific language governing permissions and
14 // limitations under the License.
15 //
16 
17 #include "update_engine/update_manager/real_time_provider.h"
18 
19 #include <string>
20 
21 #include <base/time/time.h>
22 
23 #include "update_engine/common/clock_interface.h"
24 
25 using base::Time;
26 using base::TimeDelta;
27 using chromeos_update_engine::ClockInterface;
28 using std::string;
29 
30 namespace chromeos_update_manager {
31 
32 // A variable returning the current date.
33 class CurrDateVariable : public Variable<Time> {
34  public:
35   // TODO(garnold) Turn this into an async variable with the needed callback
36   // logic for when it value changes.
37   CurrDateVariable(const string& name, ClockInterface* clock)
38       : Variable<Time>(name, TimeDelta::FromHours(1)), clock_(clock) {}
39 
40  protected:
41   virtual const Time* GetValue(TimeDelta /* timeout */, string* /* errmsg */) {
42     Time::Exploded now_exp;
43     clock_->GetWallclockTime().LocalExplode(&now_exp);
44     now_exp.hour = now_exp.minute = now_exp.second = now_exp.millisecond = 0;
45     Time* now = new Time();
46     bool success = Time::FromLocalExploded(now_exp, now);
47     DCHECK(success);
48     return now;
49   }
50 
51  private:
52   ClockInterface* clock_;
53 
54   DISALLOW_COPY_AND_ASSIGN(CurrDateVariable);
55 };
56 
57 // A variable returning the current hour in local time.
58 class CurrHourVariable : public Variable<int> {
59  public:
60   // TODO(garnold) Turn this into an async variable with the needed callback
61   // logic for when it value changes.
62   CurrHourVariable(const string& name, ClockInterface* clock)
63       : Variable<int>(name, TimeDelta::FromMinutes(5)), clock_(clock) {}
64 
65  protected:
66   virtual const int* GetValue(TimeDelta /* timeout */, string* /* errmsg */) {
67     Time::Exploded exploded;
68     clock_->GetWallclockTime().LocalExplode(&exploded);
69     return new int(exploded.hour);
70   }
71 
72  private:
73   ClockInterface* clock_;
74 
75   DISALLOW_COPY_AND_ASSIGN(CurrHourVariable);
76 };
77 
78 class CurrMinuteVariable : public Variable<int> {
79  public:
80   CurrMinuteVariable(const string& name, ClockInterface* clock)
81       : Variable<int>(name, TimeDelta::FromSeconds(15)), clock_(clock) {}
82 
83  protected:
84   virtual const int* GetValue(TimeDelta /* timeout */, string* /* errmsg */) {
85     Time::Exploded exploded;
86     clock_->GetWallclockTime().LocalExplode(&exploded);
87     return new int(exploded.minute);
88   }
89 
90  private:
91   ClockInterface* clock_;
92 
93   DISALLOW_COPY_AND_ASSIGN(CurrMinuteVariable);
94 };
95 
96 bool RealTimeProvider::Init() {
97   var_curr_date_.reset(new CurrDateVariable("curr_date", clock_));
98   var_curr_hour_.reset(new CurrHourVariable("curr_hour", clock_));
99   var_curr_minute_.reset(new CurrMinuteVariable("curr_minute", clock_));
100   return true;
101 }
102 
103 }  // namespace chromeos_update_manager
104