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1 // Copyright (c) 2017 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef CHROME_BROWSER_MEDIA_ROUTER_DISCOVERY_DISCOVERY_NETWORK_MONITOR_H_ | |
6 #define CHROME_BROWSER_MEDIA_ROUTER_DISCOVERY_DISCOVERY_NETWORK_MONITOR_H_ | |
7 | |
8 #include <string> | |
9 #include <vector> | |
10 | |
11 #include "base/bind.h" | |
12 #include "base/lazy_instance.h" | |
13 #include "base/macros.h" | |
14 #include "base/observer_list_threadsafe.h" | |
15 #include "base/synchronization/lock.h" | |
16 #include "chrome/browser/media/router/discovery/discovery_network_info.h" | |
17 #include "content/public/browser/browser_thread.h" | |
18 #include "net/base/ip_address.h" | |
19 #include "net/base/network_change_notifier.h" | |
20 | |
21 // Tracks the set of active network interfaces that can be used for local | |
22 // discovery. If the list of interfaces changes, then | |
23 // DiscoveryNetworkMonitor::Observer is called with the instance of the monitor. | |
24 // Only one instance of this should be created per browser process. | |
mark a. foltz
2017/06/05 21:28:43
Nit: s/should/will/ since we enforce this through
btolsch
2017/06/05 22:38:33
Done.
| |
25 // | |
26 // This class is not thread-safe, except for adding and removing observers. | |
27 // Most of the work done by the monitor is done on the IO thread, which includes | |
28 // updating the current network ID. Therefore |GetNetworkId| should only be | |
29 // called from the IO thread. All observers will be notified of network changes | |
30 // on the thread from which they registered. | |
31 class DiscoveryNetworkMonitor | |
32 : public net::NetworkChangeNotifier::NetworkChangeObserver { | |
33 public: | |
34 using NetworkInfoFunction = std::vector<DiscoveryNetworkInfo> (*)(); | |
35 using NetworkRefreshCompleteCallback = base::Callback<void()>; | |
36 class Observer { | |
37 public: | |
38 // Called when the list of connected interfaces has changed. | |
39 virtual void OnNetworksChanged(const DiscoveryNetworkMonitor& monitor) = 0; | |
40 | |
41 protected: | |
42 ~Observer() = default; | |
43 }; | |
44 | |
45 // Constants for the special states of network Id. | |
46 static constexpr char kNetworkIdDisconnected[] = "disconnected"; | |
mark a. foltz
2017/06/05 21:28:43
Nit: Adding non-lowercase-ascii characters to thes
btolsch
2017/06/05 22:38:33
Done.
| |
47 static constexpr char kNetworkIdUnknown[] = "unknown"; | |
48 | |
49 static DiscoveryNetworkMonitor* GetInstance(); | |
50 | |
51 void RebindNetworkChangeObserverForTest(); | |
52 void SetNetworkInfoFunctionForTest(NetworkInfoFunction); | |
53 | |
54 void AddObserver(Observer* const observer); | |
55 void RemoveObserver(Observer* const observer); | |
56 | |
57 // Forces a query of the current network state. |callback| will be called | |
58 // after the refresh. This can be called from any thread and |callback| will | |
59 // be executed on the calling thread. | |
60 void Refresh(NetworkRefreshCompleteCallback callback); | |
61 | |
62 // Computes a stable string identifier from the list of connected interfaces. | |
63 // Returns kNetworkIdDisconnected if there are no connected interfaces or | |
64 // kNetworkIdUnknown if the identifier could not be computed. This should be | |
65 // called from the IO thread. | |
66 const std::string& GetNetworkId() const; | |
67 | |
68 private: | |
69 friend struct base::LazyInstanceTraitsBase<DiscoveryNetworkMonitor>; | |
70 | |
71 DiscoveryNetworkMonitor(); | |
72 ~DiscoveryNetworkMonitor() override; | |
73 | |
74 // net::NetworkChangeNotifier::NetworkChangeObserver | |
75 void OnNetworkChanged( | |
76 net::NetworkChangeNotifier::ConnectionType type) override; | |
77 | |
78 void UpdateNetworkInfo(); | |
79 | |
80 // A hashed representation of the set of networks to which we are connected. | |
81 // This may also be |kNetworkIdDisconnected| if no interfaces are connected or | |
82 // |kNetworkIdUnknown| if we can't determine the set of networks. | |
83 std::string network_id_; | |
84 | |
85 // The list of observers which have registered interest in when |network_id_| | |
86 // changes. | |
87 scoped_refptr<base::ObserverListThreadSafe<Observer>> observers_; | |
88 | |
89 // Function used to get information about the networks to which we are | |
90 // connected. | |
91 NetworkInfoFunction network_info_function_; | |
92 | |
93 DISALLOW_COPY_AND_ASSIGN(DiscoveryNetworkMonitor); | |
94 }; | |
95 | |
96 #endif // CHROME_BROWSER_MEDIA_ROUTER_DISCOVERY_DISCOVERY_NETWORK_MONITOR_H_ | |
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