1 files changed, 207 insertions, 0 deletions
diff --git a/chromium/net/third_party/quiche/src/quiche/quic/test_tools/simulator/quic_endpoint_test.cc b/chromium/net/third_party/quiche/src/quiche/quic/test_tools/simulator/quic_endpoint_test.cc
new file mode 100644
index 00000000000..823c190fe34
--- /dev/null
+++ b/chromium/net/third_party/quiche/src/quiche/quic/test_tools/simulator/quic_endpoint_test.cc
@@ -0,0 +1,207 @@
+// Copyright (c) 2012 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.
+
+#include "quiche/quic/test_tools/simulator/quic_endpoint.h"
+
+#include <utility>
+
+#include "quiche/quic/platform/api/quic_flags.h"
+#include "quiche/quic/platform/api/quic_test.h"
+#include "quiche/quic/test_tools/quic_connection_peer.h"
+#include "quiche/quic/test_tools/quic_test_utils.h"
+#include "quiche/quic/test_tools/simulator/simulator.h"
+#include "quiche/quic/test_tools/simulator/switch.h"
+
+using ::testing::_;
+using ::testing::NiceMock;
+using ::testing::Return;
+
+namespace quic {
+namespace simulator {
+
+const QuicBandwidth kDefaultBandwidth =
+    QuicBandwidth::FromKBitsPerSecond(10 * 1000);
+const QuicTime::Delta kDefaultPropagationDelay =
+    QuicTime::Delta::FromMilliseconds(20);
+const QuicByteCount kDefaultBdp = kDefaultBandwidth * kDefaultPropagationDelay;
+
+// A simple test harness where all hosts are connected to a switch with
+// identical links.
+class QuicEndpointTest : public QuicTest {
+ public:
+  QuicEndpointTest()
+      : simulator_(), switch_(&simulator_, "Switch", 8, kDefaultBdp * 2) {}
+
+ protected:
+  Simulator simulator_;
+  Switch switch_;
+
+  std::unique_ptr<SymmetricLink> Link(Endpoint* a, Endpoint* b) {
+    return std::make_unique<SymmetricLink>(a, b, kDefaultBandwidth,
+                                           kDefaultPropagationDelay);
+  }
+
+  std::unique_ptr<SymmetricLink> CustomLink(Endpoint* a, Endpoint* b,
+                                            uint64_t extra_rtt_ms) {
+    return std::make_unique<SymmetricLink>(
+        a, b, kDefaultBandwidth,
+        kDefaultPropagationDelay +
+            QuicTime::Delta::FromMilliseconds(extra_rtt_ms));
+  }
+};
+
+// Test transmission from one host to another.
+TEST_F(QuicEndpointTest, OneWayTransmission) {
+  QuicEndpoint endpoint_a(&simulator_, "Endpoint A", "Endpoint B",
+                          Perspective::IS_CLIENT, test::TestConnectionId(42));
+  QuicEndpoint endpoint_b(&simulator_, "Endpoint B", "Endpoint A",
+                          Perspective::IS_SERVER, test::TestConnectionId(42));
+  auto link_a = Link(&endpoint_a, switch_.port(1));
+  auto link_b = Link(&endpoint_b, switch_.port(2));
+
+  // First transmit a small, packet-size chunk of data.
+  endpoint_a.AddBytesToTransfer(600);
+  QuicTime end_time =
+      simulator_.GetClock()->Now() + QuicTime::Delta::FromMilliseconds(1000);
+  simulator_.RunUntil(
+      [this, end_time]() { return simulator_.GetClock()->Now() >= end_time; });
+
+  EXPECT_EQ(600u, endpoint_a.bytes_transferred());
+  ASSERT_EQ(600u, endpoint_b.bytes_received());
+  EXPECT_FALSE(endpoint_a.wrong_data_received());
+  EXPECT_FALSE(endpoint_b.wrong_data_received());
+
+  // After a small chunk succeeds, try to transfer 2 MiB.
+  endpoint_a.AddBytesToTransfer(2 * 1024 * 1024);
+  end_time = simulator_.GetClock()->Now() + QuicTime::Delta::FromSeconds(5);
+  simulator_.RunUntil(
+      [this, end_time]() { return simulator_.GetClock()->Now() >= end_time; });
+
+  const QuicByteCount total_bytes_transferred = 600 + 2 * 1024 * 1024;
+  EXPECT_EQ(total_bytes_transferred, endpoint_a.bytes_transferred());
+  EXPECT_EQ(total_bytes_transferred, endpoint_b.bytes_received());
+  EXPECT_EQ(0u, endpoint_a.write_blocked_count());
+  EXPECT_FALSE(endpoint_a.wrong_data_received());
+  EXPECT_FALSE(endpoint_b.wrong_data_received());
+}
+
+// Test the situation in which the writer becomes write-blocked.
+TEST_F(QuicEndpointTest, WriteBlocked) {
+  QuicEndpoint endpoint_a(&simulator_, "Endpoint A", "Endpoint B",
+                          Perspective::IS_CLIENT, test::TestConnectionId(42));
+  QuicEndpoint endpoint_b(&simulator_, "Endpoint B", "Endpoint A",
+                          Perspective::IS_SERVER, test::TestConnectionId(42));
+  auto link_a = Link(&endpoint_a, switch_.port(1));
+  auto link_b = Link(&endpoint_b, switch_.port(2));
+
+  // Will be owned by the sent packet manager.
+  auto* sender = new NiceMock<test::MockSendAlgorithm>();
+  EXPECT_CALL(*sender, CanSend(_)).WillRepeatedly(Return(true));
+  EXPECT_CALL(*sender, PacingRate(_))
+      .WillRepeatedly(Return(10 * kDefaultBandwidth));
+  EXPECT_CALL(*sender, BandwidthEstimate())
+      .WillRepeatedly(Return(10 * kDefaultBandwidth));
+  EXPECT_CALL(*sender, GetCongestionWindow())
+      .WillRepeatedly(Return(kMaxOutgoingPacketSize *
+                             GetQuicFlag(FLAGS_quic_max_congestion_window)));
+  test::QuicConnectionPeer::SetSendAlgorithm(endpoint_a.connection(), sender);
+
+  // First transmit a small, packet-size chunk of data.
+  QuicByteCount bytes_to_transfer = 3 * 1024 * 1024;
+  endpoint_a.AddBytesToTransfer(bytes_to_transfer);
+  QuicTime end_time =
+      simulator_.GetClock()->Now() + QuicTime::Delta::FromSeconds(30);
+  simulator_.RunUntil([this, &endpoint_b, bytes_to_transfer, end_time]() {
+    return endpoint_b.bytes_received() == bytes_to_transfer ||
+           simulator_.GetClock()->Now() >= end_time;
+  });
+
+  EXPECT_EQ(bytes_to_transfer, endpoint_a.bytes_transferred());
+  EXPECT_EQ(bytes_to_transfer, endpoint_b.bytes_received());
+  EXPECT_GT(endpoint_a.write_blocked_count(), 0u);
+  EXPECT_FALSE(endpoint_a.wrong_data_received());
+  EXPECT_FALSE(endpoint_b.wrong_data_received());
+}
+
+// Test transmission of 1 MiB of data between two hosts simultaneously in both
+// directions.
+TEST_F(QuicEndpointTest, TwoWayTransmission) {
+  QuicEndpoint endpoint_a(&simulator_, "Endpoint A", "Endpoint B",
+                          Perspective::IS_CLIENT, test::TestConnectionId(42));
+  QuicEndpoint endpoint_b(&simulator_, "Endpoint B", "Endpoint A",
+                          Perspective::IS_SERVER, test::TestConnectionId(42));
+  auto link_a = Link(&endpoint_a, switch_.port(1));
+  auto link_b = Link(&endpoint_b, switch_.port(2));
+
+  endpoint_a.RecordTrace();
+  endpoint_b.RecordTrace();
+
+  endpoint_a.AddBytesToTransfer(1024 * 1024);
+  endpoint_b.AddBytesToTransfer(1024 * 1024);
+  QuicTime end_time =
+      simulator_.GetClock()->Now() + QuicTime::Delta::FromSeconds(5);
+  simulator_.RunUntil(
+      [this, end_time]() { return simulator_.GetClock()->Now() >= end_time; });
+
+  EXPECT_EQ(1024u * 1024u, endpoint_a.bytes_transferred());
+  EXPECT_EQ(1024u * 1024u, endpoint_b.bytes_transferred());
+  EXPECT_EQ(1024u * 1024u, endpoint_a.bytes_received());
+  EXPECT_EQ(1024u * 1024u, endpoint_b.bytes_received());
+  EXPECT_FALSE(endpoint_a.wrong_data_received());
+  EXPECT_FALSE(endpoint_b.wrong_data_received());
+}
+
+// Simulate three hosts trying to send data to a fourth one simultaneously.
+TEST_F(QuicEndpointTest, Competition) {
+  auto endpoint_a = std::make_unique<QuicEndpoint>(
+      &simulator_, "Endpoint A", "Endpoint D (A)", Perspective::IS_CLIENT,
+      test::TestConnectionId(42));
+  auto endpoint_b = std::make_unique<QuicEndpoint>(
+      &simulator_, "Endpoint B", "Endpoint D (B)", Perspective::IS_CLIENT,
+      test::TestConnectionId(43));
+  auto endpoint_c = std::make_unique<QuicEndpoint>(
+      &simulator_, "Endpoint C", "Endpoint D (C)", Perspective::IS_CLIENT,
+      test::TestConnectionId(44));
+  auto endpoint_d_a = std::make_unique<QuicEndpoint>(
+      &simulator_, "Endpoint D (A)", "Endpoint A", Perspective::IS_SERVER,
+      test::TestConnectionId(42));
+  auto endpoint_d_b = std::make_unique<QuicEndpoint>(
+      &simulator_, "Endpoint D (B)", "Endpoint B", Perspective::IS_SERVER,
+      test::TestConnectionId(43));
+  auto endpoint_d_c = std::make_unique<QuicEndpoint>(
+      &simulator_, "Endpoint D (C)", "Endpoint C", Perspective::IS_SERVER,
+      test::TestConnectionId(44));
+  QuicEndpointMultiplexer endpoint_d(
+      "Endpoint D",
+      {endpoint_d_a.get(), endpoint_d_b.get(), endpoint_d_c.get()});
+
+  // Create links with slightly different RTTs in order to avoid pathological
+  // side-effects of packets entering the queue at the exactly same time.
+  auto link_a = CustomLink(endpoint_a.get(), switch_.port(1), 0);
+  auto link_b = CustomLink(endpoint_b.get(), switch_.port(2), 1);
+  auto link_c = CustomLink(endpoint_c.get(), switch_.port(3), 2);
+  auto link_d = Link(&endpoint_d, switch_.port(4));
+
+  endpoint_a->AddBytesToTransfer(2 * 1024 * 1024);
+  endpoint_b->AddBytesToTransfer(2 * 1024 * 1024);
+  endpoint_c->AddBytesToTransfer(2 * 1024 * 1024);
+  QuicTime end_time =
+      simulator_.GetClock()->Now() + QuicTime::Delta::FromSeconds(12);
+  simulator_.RunUntil(
+      [this, end_time]() { return simulator_.GetClock()->Now() >= end_time; });
+
+  for (QuicEndpoint* endpoint :
+       {endpoint_a.get(), endpoint_b.get(), endpoint_c.get()}) {
+    EXPECT_EQ(2u * 1024u * 1024u, endpoint->bytes_transferred());
+    EXPECT_GE(endpoint->connection()->GetStats().packets_lost, 0u);
+  }
+  for (QuicEndpoint* endpoint :
+       {endpoint_d_a.get(), endpoint_d_b.get(), endpoint_d_c.get()}) {
+    EXPECT_EQ(2u * 1024u * 1024u, endpoint->bytes_received());
+    EXPECT_FALSE(endpoint->wrong_data_received());
+  }
+}
+
+}  // namespace simulator
+}  // namespace quic