Add TransportContext class.

remoting/protocol/transport_context.h

+// Copyright 2015 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.
+
+#ifndef REMOTING_PROTOCOL_TRANSPORT_CONTEXT_H_
+#define REMOTING_PROTOCOL_TRANSPORT_CONTEXT_H_
+
+#include <list>
+#include <string>
+#include <vector>
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "remoting/protocol/network_settings.h"
+#include "remoting/protocol/transport.h"
+#include "remoting/signaling/jingle_info_request.h"
+
+namespace cricket {
+class PortAllocator;
+}  // namespace cricket
+
+namespace remoting {
+
+class SignalStrategy;
+
+namespace protocol {
+
+class PortAllocatorFactory;
+
+// TransportContext is responsible for storing all parameters required for
+// P2P transport initialization. It's also responsible for making JingleInfo
+// request and creation of PortAllocators configured according to the JingleInfo
+// result.
+class TransportContext : public base::RefCountedThreadSafe<TransportContext> {
+ public:
+  typedef base::Callback<void(scoped_ptr<cricket::PortAllocator>
+                                  port_allocator)> CreatePortAllocatorCallback;
+
+  TransportContext(
+      SignalStrategy* signal_strategy,
+      scoped_ptr<PortAllocatorFactory> port_allocator_factory,
+      const NetworkSettings& network_settings,
+      TransportRole role);
+
+  // Prepares to create new PortAllocator instances. It may be called while
+  // connection is being negotiated to minimize the chance that the following
+  // CreatePortAllocator() will be blocking.
+  void Prepare();
+
+  // Creates new PortAllocator making sure that it has correct STUN and TURN
+  // information.
+  void CreatePortAllocator(const CreatePortAllocatorCallback& callback);
+
+  const NetworkSettings& network_settings() { return network_settings_; }
+  TransportRole role() { return role_; }
+
+ private:
+  friend class base::RefCountedThreadSafe<TransportContext>;
+
+  ~TransportContext();
+
+  void EnsureFreshJingleInfo();
+  void OnJingleInfo(const std::string& relay_token,
+                    const std::vector<std::string>& relay_hosts,
+                    const std::vector<rtc::SocketAddress>& stun_hosts);
+
+  scoped_ptr<cricket::PortAllocator> CreatePortAllocatorInternal();
+
+  SignalStrategy* signal_strategy_;
+  scoped_ptr<PortAllocatorFactory> port_allocator_factory_;
+  NetworkSettings network_settings_;
+  TransportRole role_;
+
+  base::TimeTicks last_jingle_info_update_time_;
+  scoped_ptr<JingleInfoRequest> jingle_info_request_;
+
+  std::string relay_token_;
+  std::vector<std::string> relay_hosts_;
+  std::vector<rtc::SocketAddress> stun_hosts_;
+
+  // When there is an active |jingle_info_request_| stores list of callbacks to
+  // be called once the |jingle_info_request_| is finished.
+  std::list<CreatePortAllocatorCallback> pending_port_allocator_requests_;
+
+  DISALLOW_COPY_AND_ASSIGN(TransportContext);
+};
+
+}  // namespace protocol
+}  // namespace remoting
+
+#endif  // REMOTING_PROTOCOL_TRANSPORT_CONTEXT_H_