First step in providing a UdpTransportChannel.

webrtc/p2p/rawudp/rawudptransportchannel_unittest.cc

+/*
+ *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <algorithm>
+#include <list>
+#include <memory>
+#include <utility>
+#include <vector>
+
+
+#include "webrtc/base/gunit.h"
+#include "webrtc/base/thread.h"
+#include "webrtc/base/socketserver.h"
+#include "webrtc/p2p/base/transportchannelimpl.h"
+#include "webrtc/p2p/rawudp/rawudptransportchannel.h"
+
+namespace cricket {
+
+class RawUdpTransPortChannelTest : public testing::Test,
+                                   public sigslot::has_slots<> {
+ public:
+  void SetUp() {
+    // TODO(johan) investigate whether an AutoThread should be instantiated.
+    network_thread_ = rtc::Thread::Current();
+    ASSERT_NE(nullptr, network_thread_);
+    network_thread_->set_socketserver(
+        rtc::SocketServer::CreateDefault().release());
+    ep1_.Init("name1", 1);
+    ep2_.Init("name2", 2);
+  }

[sprang_webrtc, 2016/10/07 09:56:22]

nit: empty line between methods. here and elsewhere

+  void TearDown() {
+    ep1_.Reset();
+    ep2_.Reset();
+    network_thread_ = nullptr;
+  }
+
+  struct Endpoint : public sigslot::has_slots<> {
+    void Init(std::string tch_name, int component) {
+      ch_.reset(new RawUdpTransportChannel(std::move(tch_name), component));
+      ch_->SignalReadPacket.connect(this, &Endpoint::OnReadPacket);
+      ch_->SignalCandidateGathered.connect(this,
+                                           &Endpoint::OnCandidateGathered);
+      ch_->SignalGatheringState.connect(this,
+                                        &Endpoint::OnGatheringStateChanged);
+      ResetStats();
+    }
+    void Reset() {
+      ch_.reset();
+      local_candidates_.clear();
+      remote_candidates_.clear();
+      gathering_state_changes_.clear();
+    }
+    bool CheckData(const char* data, int len) {
+      bool ret = false;
+      if (!ch_packets_.empty()) {
+        std::string packet = ch_packets_.front();
+        ret = (packet == std::string(data, len));
+        ch_packets_.pop_front();
+      }
+      return ret;
+    }
+
+    void ResetStats() {
+      num_received_packets_ = 0;
+      num_send_packets_ = 0;
+      count_signal_tch_state_changed_ = 0;
+    }
+
+    void OnReadPacket(TransportChannel* channel,
+                      const char* data,
+                      size_t len,
+                      const rtc::PacketTime& packet_time,
+                      int flags) {
+      num_received_packets_++;
+      LOG(LS_VERBOSE) << "OnReadPacket (unittest)";
+      ch_packets_.push_front(std::string(data, len));
+    }
+
+    int SendData(const char* data, size_t len) {
+      rtc::PacketOptions options;
+      return ch_->SendPacket(data, len, options, 0);
+    }
+
+    void OnCandidateGathered(TransportChannelImpl* channel,
+                             const Candidate& cand) {
+      ASSERT_EQ(ch_.get(), channel);
+      local_candidates_.push_back(cand);
+    }
+
+    // for now this function is only well defined, if there is exact one local
+    // candidate
+    void GetLocalPort(uint16_t* local_port) {
+      ASSERT_EQ(1u, local_candidates_.size());
+      const cricket::Candidate& cand = local_candidates_[0];
+      const rtc::SocketAddress& addr = cand.address();
+      *local_port = addr.port();
+    }
+
+    void OnGatheringStateChanged(TransportChannelImpl* channel) {
+      ASSERT_EQ(ch_.get(), channel);
+      IceGatheringState gathering_state = channel->gathering_state();
+      gathering_state_changes_.push_back(gathering_state);
+    }
+
+    std::list<std::string> ch_packets_;
+    std::unique_ptr<RawUdpTransportChannel> ch_;
+    uint32_t num_received_packets_;  // increases on SignalReadPacket
+    uint32_t num_send_packets_;
+    std::vector<IceGatheringState> gathering_state_changes_;
+    uint32_t count_signal_tch_state_changed_;
+    // TODO(johan) check if it makes sense to have a vector of
+    // std::shared<cricket::Candidate> to simplify memory cleanup
+    Candidates local_candidates_;
+    Candidates remote_candidates_;
+  };
+  Endpoint ep1_;
+  Endpoint ep2_;
+  rtc::Thread* network_thread_;
+
+  void TestSendRecv() {
+    for (uint32_t i = 0; i < 5; ++i) {
+      static const char* data = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
+      int len = static_cast<int>(strlen(data));
+      // local_channel1 <==> remote_chanel1
+      EXPECT_EQ_WAIT(len, ep1_.SendData(data, len), 1000);
+      // rtc::Thread::Current()->ProcessMessages(1000);
+      EXPECT_TRUE_WAIT(ep2_.CheckData(data, len), 1000);
+      EXPECT_EQ_WAIT(i + 1u, ep2_.num_received_packets_, 100);
+      EXPECT_EQ_WAIT(len, ep2_.SendData(data, len), 1000);
+      // rtc::Thread::Current()->ProcessMessages(1000);
+      EXPECT_TRUE_WAIT(ep1_.CheckData(data, len), 1000);
+      EXPECT_EQ_WAIT(i + 1u, ep1_.num_received_packets_, 100);
+    }
+  }
+};
+
+TEST_F(RawUdpTransPortChannelTest, SendRecvBasic) {
+  ep1_.ch_->MaybeStartGathering();
+  ep2_.ch_->MaybeStartGathering();
+  uint16_t port;
+  ep2_.GetLocalPort(&port);
+  rtc::SocketAddress addr2 = rtc::SocketAddress("127.0.0.1", port);
+  cricket::Candidate cand;
+  cand.set_address(addr2);
+  ep1_.ch_->AddRemoteCandidate(cand);
+  ep1_.GetLocalPort(&port);
+  rtc::SocketAddress addr1 = rtc::SocketAddress("127.0.0.1", port);
+  cand.set_address(addr1);
+  ep2_.ch_->AddRemoteCandidate(cand);
+  TestSendRecv();
+}
+
+TEST_F(RawUdpTransPortChannelTest, MaybeStartGatheringTwice) {
+  ep1_.ch_->MaybeStartGathering();
+  ep1_.ch_->MaybeStartGathering();
+  EXPECT_EQ_WAIT(1u, ep1_.local_candidates_.size(), 1000);
+}
+
+TEST_F(RawUdpTransPortChannelTest, StatusAndSignals) {
+  /* TransportController connects to several signals of a TransportChannel.
+     RawUdpTransportChannel should emit all this signals.
+     Exception to this rule is SignalDtlsHandshakeError.
+   */

[sprang_webrtc, 2016/10/07 09:56:21]

Avoid /* */ blocks in favor of //-prefix for all lines.

[johan, 2016/10/07 12:24:26]

Acknowledged.

+  EXPECT_EQ(kIceGatheringNew, ep1_.ch_->gathering_state());
+  ep1_.ch_->MaybeStartGathering();
+  ASSERT_EQ_WAIT(2u, ep1_.gathering_state_changes_.size(), 100);
+  EXPECT_EQ(kIceGatheringGathering, ep1_.gathering_state_changes_[0]);
+  EXPECT_EQ(kIceGatheringComplete, ep1_.gathering_state_changes_[1]);
+  // Loopback
+  EXPECT_EQ_WAIT(1u, ep1_.local_candidates_.size(), 100);
+  Candidate& cand = ep1_.local_candidates_[0];

[sprang_webrtc, 2016/10/07 09:56:21]

Please use only const references, or pointer types if non-const methods are
called.

[johan, 2016/10/07 12:24:26]

Good one. Actually I should have a copy in this place.

+  EXPECT_TRUE(!ep1_.ch_->writable());
+  rtc::SocketAddress cand_addr = cand.address();
+  // keep port, but explicit set IP
+  cand_addr.SetIP("127.0.0.1");
+  cand.set_address(cand_addr);
+  ep1_.ch_->AddRemoteCandidate(cand);
+  EXPECT_TRUE(ep1_.ch_->writable());
+  // TODO(johan): test for SignalWritableState
+  const char data[] = "abc";
+  ep1_.SendData(data, sizeof(data));
+  EXPECT_EQ_WAIT(1u, ep1_.ch_packets_.size(), 100);
+}
+}  // namespace cricket