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      1 // Copyright 2015 The Weave 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 LIBWEAVE_INCLUDE_WEAVE_PROVIDER_NETWORK_H_
      6 #define LIBWEAVE_INCLUDE_WEAVE_PROVIDER_NETWORK_H_
      7 
      8 #include <string>
      9 
     10 #include <base/callback.h>
     11 #include <weave/error.h>
     12 #include <weave/stream.h>
     13 
     14 namespace weave {
     15 namespace provider {
     16 
     17 // Interface with methods to detect network connectivity and opening network
     18 // connections.
     19 class Network {
     20  public:
     21   enum class State {
     22     kOffline = 0,
     23     kError,
     24     kConnecting,
     25     kOnline,
     26   };
     27 
     28   // Callback type for AddConnectionChangedCallback.
     29   using ConnectionChangedCallback = base::Closure;
     30 
     31   // Callback type for OpenSslSocket.
     32   using OpenSslSocketCallback =
     33       base::Callback<void(std::unique_ptr<Stream> stream, ErrorPtr error)>;
     34 
     35   // Subscribes to notification about changes in network connectivity. Changes
     36   // may include but not limited: interface up or down, new IP was assigned,
     37   // cable is disconnected.
     38   virtual void AddConnectionChangedCallback(
     39       const ConnectionChangedCallback& callback) = 0;
     40 
     41   // Returns current Internet connectivity state
     42   virtual State GetConnectionState() const = 0;
     43 
     44   // Opens bidirectional sockets and returns attached stream.
     45   virtual void OpenSslSocket(const std::string& host,
     46                              uint16_t port,
     47                              const OpenSslSocketCallback& callback) = 0;
     48 
     49  protected:
     50   virtual ~Network() {}
     51 };
     52 
     53 }  // namespace provider
     54 }  // namespace weave
     55 
     56 #endif  // LIBWEAVE_INCLUDE_WEAVE_PROVIDER_NETWORK_H_
     57