1 //
2 // Copyright (C) 2016 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/dbus_connection.h"
18 
19 #include <base/time/time.h>
20 
21 namespace chromeos_update_engine {
22 
23 namespace {
24 const int kDBusSystemMaxWaitSeconds = 2 * 60;
25 
26 DBusConnection* dbus_connection_singleton = nullptr;
27 }  // namespace
28 
DBusConnection()29 DBusConnection::DBusConnection() {
30   // We wait for the D-Bus connection for up two minutes to avoid re-spawning
31   // the daemon too fast causing thrashing if dbus-daemon is not running.
32   bus_ = dbus_connection_.ConnectWithTimeout(
33       base::TimeDelta::FromSeconds(kDBusSystemMaxWaitSeconds));
34 
35   if (!bus_) {
36     // TODO(deymo): Make it possible to run update_engine even if dbus-daemon
37     // is not running or constantly crashing.
38     LOG(FATAL) << "Failed to initialize DBus, aborting.";
39   }
40 
41   CHECK(bus_->SetUpAsyncOperations());
42 }
43 
GetDBus()44 const scoped_refptr<dbus::Bus>& DBusConnection::GetDBus() {
45   CHECK(bus_);
46   return bus_;
47 }
48 
Get()49 DBusConnection* DBusConnection::Get() {
50   if (!dbus_connection_singleton)
51     dbus_connection_singleton = new DBusConnection();
52   return dbus_connection_singleton;
53 }
54 
55 }  // namespace chromeos_update_engine
56