Implement network performance simulation for remoting perf tests.

remoting/test/fake_socket_factory.h

Index: remoting/test/fake_socket_factory.h
diff --git a/remoting/test/fake_socket_factory.h b/remoting/test/fake_socket_factory.h
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+++ b/remoting/test/fake_socket_factory.h
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+// Copyright 2014 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_TEST_FAKE_SOCKET_FACTORY_H_
+#define REMOTING_TEST_FAKE_SOCKET_FACTORY_H_
+
+#include <list>
+
+#include "base/callback_forward.h"
+#include "base/compiler_specific.h"
+#include "base/memory/weak_ptr.h"
+#include "remoting/test/fake_network_dispatcher.h"
+#include "third_party/libjingle/source/talk/p2p/base/packetsocketfactory.h"
+
+namespace remoting {
+
+class FakeNetworkDispatcher;
+class LeakyBucket;
+
+class FakePacketSocketFactory : public rtc::PacketSocketFactory,
+                                public FakeNetworkDispatcher::Node {
+ public:
+  // |dispatcher| must outlive the factory.
+  explicit FakePacketSocketFactory(FakeNetworkDispatcher* dispatcher);
+  virtual ~FakePacketSocketFactory();
+
+  void OnSocketDestroyed(int port);
+
+  // |bandwidth| - simulated link bandwidth in bytes/second. 0 indicates that
+  // bandwidth is unlimited.
+  // |max_buffer| - size of buffers in bytes. Ignored when |bandwidth| is 0.
+  void SetBandwidth(int bandwidth, int max_buffer);
+
+  // Specifies parameters for simulated network latency. Latency is generated
+  // with normal distribution around |average| with the given |stddev|. Random
+  // latency calculated based on these parameters is added to the buffering
+  // delay (which is calculated based on the parameters passed to
+  // SetBandwidth()). I.e. total latency for each packet is calculated using the
+  // following formula
+  //
+  //    l = NormalRand(average, stddev) + bytes_buffered / bandwidth .
+  //
+  // Where bytes_buffered is the current level in the leaky bucket used to
+  // control bandwidth.
+  void SetLatency(base::TimeDelta average, base::TimeDelta stddev);
+
+  void set_out_of_order_rate(double out_of_order_rate) {
+    out_of_order_rate_ = out_of_order_rate;
+  }
+
+  // rtc::PacketSocketFactory interface.
+  virtual rtc::AsyncPacketSocket* CreateUdpSocket(
+      const rtc::SocketAddress& local_address,
+      int min_port, int max_port) OVERRIDE;
+  virtual rtc::AsyncPacketSocket* CreateServerTcpSocket(
+      const rtc::SocketAddress& local_address,
+      int min_port, int max_port,
+      int opts) OVERRIDE;
+  virtual rtc::AsyncPacketSocket* CreateClientTcpSocket(
+      const rtc::SocketAddress& local_address,
+      const rtc::SocketAddress& remote_address,
+      const rtc::ProxyInfo& proxy_info,
+      const std::string& user_agent,
+      int opts) OVERRIDE;
+  virtual rtc::AsyncResolverInterface* CreateAsyncResolver() OVERRIDE;
+
+  // FakeNetworkDispatcher::Node interface.
+  virtual const scoped_refptr<base::SingleThreadTaskRunner>& GetThread()
+      const OVERRIDE;
+  virtual const rtc::IPAddress& GetAddress() const OVERRIDE;
+  virtual void ReceivePacket(const rtc::SocketAddress& from,
+                             const rtc::SocketAddress& to,
+                             const scoped_refptr<net::IOBuffer>& data,
+                             int data_size) OVERRIDE;
+
+ private:
+  struct PendingPacket {
+    PendingPacket();
+    PendingPacket(
+        const rtc::SocketAddress& from,
+        const rtc::SocketAddress& to,
+        const scoped_refptr<net::IOBuffer>& data,
+        int data_size);
+    ~PendingPacket();
+
+    rtc::SocketAddress from;
+    rtc::SocketAddress to;
+    scoped_refptr<net::IOBuffer> data;
+    int data_size;
+  };
+
+  typedef base::Callback<void(const rtc::SocketAddress& from,
+                              const rtc::SocketAddress& to,
+                              const scoped_refptr<net::IOBuffer>& data,
+                              int data_size)> ReceiveCallback;
+  typedef std::map<uint16_t, ReceiveCallback> UdpSocketsMap;
+
+  void DoReceivePacket();
+
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  scoped_refptr<FakeNetworkDispatcher> dispatcher_;
+
+  rtc::IPAddress address_;
+
+  scoped_ptr<LeakyBucket> leaky_bucket_;
+  base::TimeDelta latency_average_;
+  base::TimeDelta latency_stddev_;
+  double out_of_order_rate_;
+
+  UdpSocketsMap udp_sockets_;
+  uint16_t next_port_;
+
+  std::list<PendingPacket> pending_packets_;
+
+  base::WeakPtrFactory<FakePacketSocketFactory> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(FakePacketSocketFactory);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_TEST_FAKE_SOCKET_FACTORY_H_