p2p/base/port_allocator_unittest.cc - src - Git at Google

 /*
  *  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 "p2p/base/port_allocator.h"

 #include <memory>

 #include "p2p/base/fake_port_allocator.h"
 #include "rtc_base/thread.h"
 #include "rtc_base/virtual_socket_server.h"
 #include "test/gtest.h"

 static const char kContentName[] = "test content";
 // Based on ICE_UFRAG_LENGTH
 static const char kIceUfrag[] = "UF00";
 // Based on ICE_PWD_LENGTH
 static const char kIcePwd[] = "TESTICEPWD00000000000000";
 static const char kTurnUsername[] = "test";
 static const char kTurnPassword[] = "test";

 class PortAllocatorTest : public ::testing::Test, public sigslot::has_slots<> {
  public:
   PortAllocatorTest()
       : vss_(new rtc::VirtualSocketServer()), main_(vss_.get()) {
     allocator_.reset(
         new cricket::FakePortAllocator(rtc::Thread::Current(), nullptr));
   }

  protected:
   void SetConfigurationWithPoolSize(int candidate_pool_size) {
     EXPECT_TRUE(allocator_->SetConfiguration(
         cricket::ServerAddresses(), std::vector<cricket::RelayServerConfig>(),
         candidate_pool_size, webrtc::NO_PRUNE));
   }

   void SetConfigurationWithPoolSizeExpectFailure(int candidate_pool_size) {
     EXPECT_FALSE(allocator_->SetConfiguration(
         cricket::ServerAddresses(), std::vector<cricket::RelayServerConfig>(),
         candidate_pool_size, webrtc::NO_PRUNE));
   }

   std::unique_ptr<cricket::FakePortAllocatorSession> CreateSession(
       const std::string& content_name,
       int component,
       const std::string& ice_ufrag,
       const std::string& ice_pwd) {
     return std::unique_ptr<cricket::FakePortAllocatorSession>(
         static_cast<cricket::FakePortAllocatorSession*>(
             allocator_
                 ->CreateSession(content_name, component, ice_ufrag, ice_pwd)
                 .release()));
   }

   const cricket::FakePortAllocatorSession* GetPooledSession() const {
     return static_cast<const cricket::FakePortAllocatorSession*>(
         allocator_->GetPooledSession());
   }

   std::unique_ptr<cricket::FakePortAllocatorSession> TakePooledSession() {
     return std::unique_ptr<cricket::FakePortAllocatorSession>(
         static_cast<cricket::FakePortAllocatorSession*>(
             allocator_->TakePooledSession(kContentName, 0, kIceUfrag, kIcePwd)
                 .release()));
   }

   int GetAllPooledSessionsReturnCount() {
     int count = 0;
     while (TakePooledSession() != nullptr) {
       ++count;
     }
     return count;
   }

   std::unique_ptr<rtc::VirtualSocketServer> vss_;
   rtc::AutoSocketServerThread main_;
   std::unique_ptr<cricket::FakePortAllocator> allocator_;
   rtc::SocketAddress stun_server_1{"11.11.11.11", 3478};
   rtc::SocketAddress stun_server_2{"22.22.22.22", 3478};
   cricket::RelayServerConfig turn_server_1{"11.11.11.11",      3478,
                                            kTurnUsername,      kTurnPassword,
                                            cricket::PROTO_UDP, false};
   cricket::RelayServerConfig turn_server_2{"22.22.22.22",      3478,
                                            kTurnUsername,      kTurnPassword,
                                            cricket::PROTO_UDP, false};
 };

 TEST_F(PortAllocatorTest, TestDefaults) {
   EXPECT_EQ(0UL, allocator_->stun_servers().size());
   EXPECT_EQ(0UL, allocator_->turn_servers().size());
   EXPECT_EQ(0, allocator_->candidate_pool_size());
   EXPECT_EQ(0, GetAllPooledSessionsReturnCount());
 }

 // Call CreateSession and verify that the parameters passed in and the
 // candidate filter are applied as expected.
 TEST_F(PortAllocatorTest, CreateSession) {
   allocator_->SetCandidateFilter(cricket::CF_RELAY);
   auto session = CreateSession(kContentName, 1, kIceUfrag, kIcePwd);
   ASSERT_NE(nullptr, session);
   EXPECT_EQ(cricket::CF_RELAY, session->candidate_filter());
   EXPECT_EQ(kContentName, session->content_name());
   EXPECT_EQ(1, session->component());
   EXPECT_EQ(kIceUfrag, session->ice_ufrag());
   EXPECT_EQ(kIcePwd, session->ice_pwd());
 }

 TEST_F(PortAllocatorTest, SetConfigurationUpdatesIceServers) {
   cricket::ServerAddresses stun_servers_1 = {stun_server_1};
   std::vector<cricket::RelayServerConfig> turn_servers_1 = {turn_server_1};
   EXPECT_TRUE(allocator_->SetConfiguration(stun_servers_1, turn_servers_1, 0,
                                            webrtc::NO_PRUNE));
   EXPECT_EQ(stun_servers_1, allocator_->stun_servers());
   EXPECT_EQ(turn_servers_1, allocator_->turn_servers());

   // Update with a different set of servers.
   cricket::ServerAddresses stun_servers_2 = {stun_server_2};
   std::vector<cricket::RelayServerConfig> turn_servers_2 = {turn_server_2};
   EXPECT_TRUE(allocator_->SetConfiguration(stun_servers_2, turn_servers_2, 0,
                                            webrtc::NO_PRUNE));
   EXPECT_EQ(stun_servers_2, allocator_->stun_servers());
   EXPECT_EQ(turn_servers_2, allocator_->turn_servers());
 }

 TEST_F(PortAllocatorTest, SetConfigurationUpdatesCandidatePoolSize) {
   SetConfigurationWithPoolSize(2);
   EXPECT_EQ(2, allocator_->candidate_pool_size());
   SetConfigurationWithPoolSize(3);
   EXPECT_EQ(3, allocator_->candidate_pool_size());
   SetConfigurationWithPoolSize(1);
   EXPECT_EQ(1, allocator_->candidate_pool_size());
   SetConfigurationWithPoolSize(4);
   EXPECT_EQ(4, allocator_->candidate_pool_size());
 }

 // A negative pool size should just be treated as zero.
 TEST_F(PortAllocatorTest, SetConfigurationWithNegativePoolSizeFails) {
   SetConfigurationWithPoolSizeExpectFailure(-1);
 }

 // Test that if the candidate pool size is nonzero, pooled sessions are
 // created, and StartGettingPorts is called on them.
 TEST_F(PortAllocatorTest, SetConfigurationCreatesPooledSessions) {
   SetConfigurationWithPoolSize(2);
   auto session_1 = TakePooledSession();
   auto session_2 = TakePooledSession();
   ASSERT_NE(nullptr, session_1.get());
   ASSERT_NE(nullptr, session_2.get());
   EXPECT_EQ(1, session_1->port_config_count());
   EXPECT_EQ(1, session_2->port_config_count());
   EXPECT_EQ(0, GetAllPooledSessionsReturnCount());
 }

 // Test that if the candidate pool size is increased, pooled sessions are
 // created as necessary.
 TEST_F(PortAllocatorTest, SetConfigurationCreatesMorePooledSessions) {
   SetConfigurationWithPoolSize(1);
   SetConfigurationWithPoolSize(2);
   EXPECT_EQ(2, GetAllPooledSessionsReturnCount());
 }

 // Test that if the candidate pool size is reduced, extra sessions are
 // destroyed.
 TEST_F(PortAllocatorTest, SetConfigurationDestroysPooledSessions) {
   SetConfigurationWithPoolSize(2);
   SetConfigurationWithPoolSize(1);
   EXPECT_EQ(1, GetAllPooledSessionsReturnCount());
 }

 // According to JSEP, existing pooled sessions should be destroyed and new
 // ones created when the ICE servers change.
 TEST_F(PortAllocatorTest,
        SetConfigurationRecreatesPooledSessionsWhenIceServersChange) {
   cricket::ServerAddresses stun_servers_1 = {stun_server_1};
   std::vector<cricket::RelayServerConfig> turn_servers_1 = {turn_server_1};
   allocator_->SetConfiguration(stun_servers_1, turn_servers_1, 1,
                                webrtc::NO_PRUNE);
   EXPECT_EQ(stun_servers_1, allocator_->stun_servers());
   EXPECT_EQ(turn_servers_1, allocator_->turn_servers());

   // Update with a different set of servers (and also change pool size).
   cricket::ServerAddresses stun_servers_2 = {stun_server_2};
   std::vector<cricket::RelayServerConfig> turn_servers_2 = {turn_server_2};
   allocator_->SetConfiguration(stun_servers_2, turn_servers_2, 2,
                                webrtc::NO_PRUNE);
   EXPECT_EQ(stun_servers_2, allocator_->stun_servers());
   EXPECT_EQ(turn_servers_2, allocator_->turn_servers());
   auto session_1 = TakePooledSession();
   auto session_2 = TakePooledSession();
   ASSERT_NE(nullptr, session_1.get());
   ASSERT_NE(nullptr, session_2.get());
   EXPECT_EQ(stun_servers_2, session_1->stun_servers());
   EXPECT_EQ(turn_servers_2, session_1->turn_servers());
   EXPECT_EQ(stun_servers_2, session_2->stun_servers());
   EXPECT_EQ(turn_servers_2, session_2->turn_servers());
   EXPECT_EQ(0, GetAllPooledSessionsReturnCount());
 }

 // According to JSEP, after SetLocalDescription, setting different ICE servers
 // will not cause the pool to be refilled. This is implemented by the
 // PeerConnection calling FreezeCandidatePool when a local description is set.
 TEST_F(PortAllocatorTest,
        SetConfigurationDoesNotRecreatePooledSessionsAfterFreezeCandidatePool) {
   cricket::ServerAddresses stun_servers_1 = {stun_server_1};
   std::vector<cricket::RelayServerConfig> turn_servers_1 = {turn_server_1};
   allocator_->SetConfiguration(stun_servers_1, turn_servers_1, 1,
                                webrtc::NO_PRUNE);
   EXPECT_EQ(stun_servers_1, allocator_->stun_servers());
   EXPECT_EQ(turn_servers_1, allocator_->turn_servers());

   // Update with a different set of servers, but first freeze the pool.
   allocator_->FreezeCandidatePool();
   cricket::ServerAddresses stun_servers_2 = {stun_server_2};
   std::vector<cricket::RelayServerConfig> turn_servers_2 = {turn_server_2};
   allocator_->SetConfiguration(stun_servers_2, turn_servers_2, 2,
                                webrtc::NO_PRUNE);
   EXPECT_EQ(stun_servers_2, allocator_->stun_servers());
   EXPECT_EQ(turn_servers_2, allocator_->turn_servers());
   auto session = TakePooledSession();
   ASSERT_NE(nullptr, session.get());
   EXPECT_EQ(stun_servers_1, session->stun_servers());
   EXPECT_EQ(turn_servers_1, session->turn_servers());
   EXPECT_EQ(0, GetAllPooledSessionsReturnCount());
 }

 TEST_F(PortAllocatorTest, GetPooledSessionReturnsNextSession) {
   SetConfigurationWithPoolSize(2);
   auto peeked_session_1 = GetPooledSession();
   auto session_1 = TakePooledSession();
   EXPECT_EQ(session_1.get(), peeked_session_1);
   auto peeked_session_2 = GetPooledSession();
   auto session_2 = TakePooledSession();
   EXPECT_EQ(session_2.get(), peeked_session_2);
 }

 // Verify that subclasses of PortAllocatorSession are given a chance to update
 // ICE parameters when TakePooledSession is called, and the base class updates
 // the info itself.
 TEST_F(PortAllocatorTest, TakePooledSessionUpdatesIceParameters) {
   SetConfigurationWithPoolSize(1);
   auto peeked_session = GetPooledSession();
   ASSERT_NE(nullptr, peeked_session);
   EXPECT_EQ(0, peeked_session->transport_info_update_count());
   std::unique_ptr<cricket::FakePortAllocatorSession> session(
       static_cast<cricket::FakePortAllocatorSession*>(
           allocator_->TakePooledSession(kContentName, 1, kIceUfrag, kIcePwd)
               .release()));
   EXPECT_EQ(1, session->transport_info_update_count());
   EXPECT_EQ(kContentName, session->content_name());
   EXPECT_EQ(1, session->component());
   EXPECT_EQ(kIceUfrag, session->ice_ufrag());
   EXPECT_EQ(kIcePwd, session->ice_pwd());
 }

 // According to JSEP, candidate filtering should be done when the pooled
 // candidates are surfaced to the application. This means when a pooled
 // session is taken. So a pooled session should gather candidates
 // unfiltered until it's returned by TakePooledSession.
 TEST_F(PortAllocatorTest, TakePooledSessionUpdatesCandidateFilter) {
   allocator_->SetCandidateFilter(cricket::CF_RELAY);
   SetConfigurationWithPoolSize(1);
   auto peeked_session = GetPooledSession();
   ASSERT_NE(nullptr, peeked_session);
   EXPECT_EQ(cricket::CF_ALL, peeked_session->candidate_filter());
   auto session = TakePooledSession();
   EXPECT_EQ(cricket::CF_RELAY, session->candidate_filter());
 }

 // Verify that after DiscardCandidatePool, TakePooledSession doesn't return
 // anything.
 TEST_F(PortAllocatorTest, DiscardCandidatePool) {
   SetConfigurationWithPoolSize(1);
   allocator_->DiscardCandidatePool();
   EXPECT_EQ(0, GetAllPooledSessionsReturnCount());
 }

 TEST_F(PortAllocatorTest, RestrictIceCredentialsChange) {
   SetConfigurationWithPoolSize(1);
   EXPECT_EQ(1, GetAllPooledSessionsReturnCount());
   allocator_->DiscardCandidatePool();

   // Only return pooled sessions with the ice credentials that
   // match those requested in TakePooledSession().
   allocator_->set_restrict_ice_credentials_change(true);
   SetConfigurationWithPoolSize(1);
   EXPECT_EQ(0, GetAllPooledSessionsReturnCount());
   allocator_->DiscardCandidatePool();

   SetConfigurationWithPoolSize(1);
   auto credentials = allocator_->GetPooledIceCredentials();
   ASSERT_EQ(1u, credentials.size());
   EXPECT_EQ(nullptr,
             allocator_->TakePooledSession(kContentName, 0, kIceUfrag, kIcePwd));
   EXPECT_NE(nullptr,
             allocator_->TakePooledSession(kContentName, 0, credentials[0].ufrag,
                                           credentials[0].pwd));
   EXPECT_EQ(nullptr,
             allocator_->TakePooledSession(kContentName, 0, credentials[0].ufrag,
                                           credentials[0].pwd));
   allocator_->DiscardCandidatePool();
 }
	/*
	* 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 "p2p/base/port_allocator.h"

	#include <memory>

	#include "p2p/base/fake_port_allocator.h"
	#include "rtc_base/thread.h"
	#include "rtc_base/virtual_socket_server.h"
	#include "test/gtest.h"

	static const char kContentName[] = "test content";
	// Based on ICE_UFRAG_LENGTH
	static const char kIceUfrag[] = "UF00";
	// Based on ICE_PWD_LENGTH
	static const char kIcePwd[] = "TESTICEPWD00000000000000";
	static const char kTurnUsername[] = "test";
	static const char kTurnPassword[] = "test";

	class PortAllocatorTest : public ::testing::Test, public sigslot::has_slots<> {
	public:
	PortAllocatorTest()
	: vss_(new rtc::VirtualSocketServer()), main_(vss_.get()) {
	allocator_.reset(
	new cricket::FakePortAllocator(rtc::Thread::Current(), nullptr));
	}

	protected:
	void SetConfigurationWithPoolSize(int candidate_pool_size) {
	EXPECT_TRUE(allocator_->SetConfiguration(
	cricket::ServerAddresses(), std::vector<cricket::RelayServerConfig>(),
	candidate_pool_size, webrtc::NO_PRUNE));
	}

	void SetConfigurationWithPoolSizeExpectFailure(int candidate_pool_size) {
	EXPECT_FALSE(allocator_->SetConfiguration(
	cricket::ServerAddresses(), std::vector<cricket::RelayServerConfig>(),
	candidate_pool_size, webrtc::NO_PRUNE));
	}

	std::unique_ptr<cricket::FakePortAllocatorSession> CreateSession(
	const std::string& content_name,
	int component,
	const std::string& ice_ufrag,
	const std::string& ice_pwd) {
	return std::unique_ptr<cricket::FakePortAllocatorSession>(
	static_cast<cricket::FakePortAllocatorSession*>(
	allocator_
	->CreateSession(content_name, component, ice_ufrag, ice_pwd)
	.release()));
	}

	const cricket::FakePortAllocatorSession* GetPooledSession() const {
	return static_cast<const cricket::FakePortAllocatorSession*>(
	allocator_->GetPooledSession());
	}

	std::unique_ptr<cricket::FakePortAllocatorSession> TakePooledSession() {
	return std::unique_ptr<cricket::FakePortAllocatorSession>(
	static_cast<cricket::FakePortAllocatorSession*>(
	allocator_->TakePooledSession(kContentName, 0, kIceUfrag, kIcePwd)
	.release()));
	}

	int GetAllPooledSessionsReturnCount() {
	int count = 0;
	while (TakePooledSession() != nullptr) {
	++count;
	}
	return count;
	}

	std::unique_ptr<rtc::VirtualSocketServer> vss_;
	rtc::AutoSocketServerThread main_;
	std::unique_ptr<cricket::FakePortAllocator> allocator_;
	rtc::SocketAddress stun_server_1{"11.11.11.11", 3478};
	rtc::SocketAddress stun_server_2{"22.22.22.22", 3478};
	cricket::RelayServerConfig turn_server_1{"11.11.11.11", 3478,
	kTurnUsername, kTurnPassword,
	cricket::PROTO_UDP, false};
	cricket::RelayServerConfig turn_server_2{"22.22.22.22", 3478,
	kTurnUsername, kTurnPassword,
	cricket::PROTO_UDP, false};
	};

	TEST_F(PortAllocatorTest, TestDefaults) {
	EXPECT_EQ(0UL, allocator_->stun_servers().size());
	EXPECT_EQ(0UL, allocator_->turn_servers().size());
	EXPECT_EQ(0, allocator_->candidate_pool_size());
	EXPECT_EQ(0, GetAllPooledSessionsReturnCount());
	}

	// Call CreateSession and verify that the parameters passed in and the
	// candidate filter are applied as expected.
	TEST_F(PortAllocatorTest, CreateSession) {
	allocator_->SetCandidateFilter(cricket::CF_RELAY);
	auto session = CreateSession(kContentName, 1, kIceUfrag, kIcePwd);
	ASSERT_NE(nullptr, session);
	EXPECT_EQ(cricket::CF_RELAY, session->candidate_filter());
	EXPECT_EQ(kContentName, session->content_name());
	EXPECT_EQ(1, session->component());
	EXPECT_EQ(kIceUfrag, session->ice_ufrag());
	EXPECT_EQ(kIcePwd, session->ice_pwd());
	}

	TEST_F(PortAllocatorTest, SetConfigurationUpdatesIceServers) {
	cricket::ServerAddresses stun_servers_1 = {stun_server_1};
	std::vector<cricket::RelayServerConfig> turn_servers_1 = {turn_server_1};
	EXPECT_TRUE(allocator_->SetConfiguration(stun_servers_1, turn_servers_1, 0,
	webrtc::NO_PRUNE));
	EXPECT_EQ(stun_servers_1, allocator_->stun_servers());
	EXPECT_EQ(turn_servers_1, allocator_->turn_servers());

	// Update with a different set of servers.
	cricket::ServerAddresses stun_servers_2 = {stun_server_2};
	std::vector<cricket::RelayServerConfig> turn_servers_2 = {turn_server_2};
	EXPECT_TRUE(allocator_->SetConfiguration(stun_servers_2, turn_servers_2, 0,
	webrtc::NO_PRUNE));
	EXPECT_EQ(stun_servers_2, allocator_->stun_servers());
	EXPECT_EQ(turn_servers_2, allocator_->turn_servers());
	}

	TEST_F(PortAllocatorTest, SetConfigurationUpdatesCandidatePoolSize) {
	SetConfigurationWithPoolSize(2);
	EXPECT_EQ(2, allocator_->candidate_pool_size());
	SetConfigurationWithPoolSize(3);
	EXPECT_EQ(3, allocator_->candidate_pool_size());
	SetConfigurationWithPoolSize(1);
	EXPECT_EQ(1, allocator_->candidate_pool_size());
	SetConfigurationWithPoolSize(4);
	EXPECT_EQ(4, allocator_->candidate_pool_size());
	}

	// A negative pool size should just be treated as zero.
	TEST_F(PortAllocatorTest, SetConfigurationWithNegativePoolSizeFails) {
	SetConfigurationWithPoolSizeExpectFailure(-1);
	}

	// Test that if the candidate pool size is nonzero, pooled sessions are
	// created, and StartGettingPorts is called on them.
	TEST_F(PortAllocatorTest, SetConfigurationCreatesPooledSessions) {
	SetConfigurationWithPoolSize(2);
	auto session_1 = TakePooledSession();
	auto session_2 = TakePooledSession();
	ASSERT_NE(nullptr, session_1.get());
	ASSERT_NE(nullptr, session_2.get());
	EXPECT_EQ(1, session_1->port_config_count());
	EXPECT_EQ(1, session_2->port_config_count());
	EXPECT_EQ(0, GetAllPooledSessionsReturnCount());
	}

	// Test that if the candidate pool size is increased, pooled sessions are
	// created as necessary.
	TEST_F(PortAllocatorTest, SetConfigurationCreatesMorePooledSessions) {
	SetConfigurationWithPoolSize(1);
	SetConfigurationWithPoolSize(2);
	EXPECT_EQ(2, GetAllPooledSessionsReturnCount());
	}

	// Test that if the candidate pool size is reduced, extra sessions are
	// destroyed.
	TEST_F(PortAllocatorTest, SetConfigurationDestroysPooledSessions) {
	SetConfigurationWithPoolSize(2);
	SetConfigurationWithPoolSize(1);
	EXPECT_EQ(1, GetAllPooledSessionsReturnCount());
	}

	// According to JSEP, existing pooled sessions should be destroyed and new
	// ones created when the ICE servers change.
	TEST_F(PortAllocatorTest,
	SetConfigurationRecreatesPooledSessionsWhenIceServersChange) {
	cricket::ServerAddresses stun_servers_1 = {stun_server_1};
	std::vector<cricket::RelayServerConfig> turn_servers_1 = {turn_server_1};
	allocator_->SetConfiguration(stun_servers_1, turn_servers_1, 1,
	webrtc::NO_PRUNE);
	EXPECT_EQ(stun_servers_1, allocator_->stun_servers());
	EXPECT_EQ(turn_servers_1, allocator_->turn_servers());

	// Update with a different set of servers (and also change pool size).
	cricket::ServerAddresses stun_servers_2 = {stun_server_2};
	std::vector<cricket::RelayServerConfig> turn_servers_2 = {turn_server_2};
	allocator_->SetConfiguration(stun_servers_2, turn_servers_2, 2,
	webrtc::NO_PRUNE);
	EXPECT_EQ(stun_servers_2, allocator_->stun_servers());
	EXPECT_EQ(turn_servers_2, allocator_->turn_servers());
	auto session_1 = TakePooledSession();
	auto session_2 = TakePooledSession();
	ASSERT_NE(nullptr, session_1.get());
	ASSERT_NE(nullptr, session_2.get());
	EXPECT_EQ(stun_servers_2, session_1->stun_servers());
	EXPECT_EQ(turn_servers_2, session_1->turn_servers());
	EXPECT_EQ(stun_servers_2, session_2->stun_servers());
	EXPECT_EQ(turn_servers_2, session_2->turn_servers());
	EXPECT_EQ(0, GetAllPooledSessionsReturnCount());
	}

	// According to JSEP, after SetLocalDescription, setting different ICE servers
	// will not cause the pool to be refilled. This is implemented by the
	// PeerConnection calling FreezeCandidatePool when a local description is set.
	TEST_F(PortAllocatorTest,
	SetConfigurationDoesNotRecreatePooledSessionsAfterFreezeCandidatePool) {
	cricket::ServerAddresses stun_servers_1 = {stun_server_1};
	std::vector<cricket::RelayServerConfig> turn_servers_1 = {turn_server_1};
	allocator_->SetConfiguration(stun_servers_1, turn_servers_1, 1,
	webrtc::NO_PRUNE);
	EXPECT_EQ(stun_servers_1, allocator_->stun_servers());
	EXPECT_EQ(turn_servers_1, allocator_->turn_servers());

	// Update with a different set of servers, but first freeze the pool.
	allocator_->FreezeCandidatePool();
	cricket::ServerAddresses stun_servers_2 = {stun_server_2};
	std::vector<cricket::RelayServerConfig> turn_servers_2 = {turn_server_2};
	allocator_->SetConfiguration(stun_servers_2, turn_servers_2, 2,
	webrtc::NO_PRUNE);
	EXPECT_EQ(stun_servers_2, allocator_->stun_servers());
	EXPECT_EQ(turn_servers_2, allocator_->turn_servers());
	auto session = TakePooledSession();
	ASSERT_NE(nullptr, session.get());
	EXPECT_EQ(stun_servers_1, session->stun_servers());
	EXPECT_EQ(turn_servers_1, session->turn_servers());
	EXPECT_EQ(0, GetAllPooledSessionsReturnCount());
	}

	TEST_F(PortAllocatorTest, GetPooledSessionReturnsNextSession) {
	SetConfigurationWithPoolSize(2);
	auto peeked_session_1 = GetPooledSession();
	auto session_1 = TakePooledSession();
	EXPECT_EQ(session_1.get(), peeked_session_1);
	auto peeked_session_2 = GetPooledSession();
	auto session_2 = TakePooledSession();
	EXPECT_EQ(session_2.get(), peeked_session_2);
	}

	// Verify that subclasses of PortAllocatorSession are given a chance to update
	// ICE parameters when TakePooledSession is called, and the base class updates
	// the info itself.
	TEST_F(PortAllocatorTest, TakePooledSessionUpdatesIceParameters) {
	SetConfigurationWithPoolSize(1);
	auto peeked_session = GetPooledSession();
	ASSERT_NE(nullptr, peeked_session);
	EXPECT_EQ(0, peeked_session->transport_info_update_count());
	std::unique_ptr<cricket::FakePortAllocatorSession> session(
	static_cast<cricket::FakePortAllocatorSession*>(
	allocator_->TakePooledSession(kContentName, 1, kIceUfrag, kIcePwd)
	.release()));
	EXPECT_EQ(1, session->transport_info_update_count());
	EXPECT_EQ(kContentName, session->content_name());
	EXPECT_EQ(1, session->component());
	EXPECT_EQ(kIceUfrag, session->ice_ufrag());
	EXPECT_EQ(kIcePwd, session->ice_pwd());
	}

	// According to JSEP, candidate filtering should be done when the pooled
	// candidates are surfaced to the application. This means when a pooled
	// session is taken. So a pooled session should gather candidates
	// unfiltered until it's returned by TakePooledSession.
	TEST_F(PortAllocatorTest, TakePooledSessionUpdatesCandidateFilter) {
	allocator_->SetCandidateFilter(cricket::CF_RELAY);
	SetConfigurationWithPoolSize(1);
	auto peeked_session = GetPooledSession();
	ASSERT_NE(nullptr, peeked_session);
	EXPECT_EQ(cricket::CF_ALL, peeked_session->candidate_filter());
	auto session = TakePooledSession();
	EXPECT_EQ(cricket::CF_RELAY, session->candidate_filter());
	}

	// Verify that after DiscardCandidatePool, TakePooledSession doesn't return
	// anything.
	TEST_F(PortAllocatorTest, DiscardCandidatePool) {
	SetConfigurationWithPoolSize(1);
	allocator_->DiscardCandidatePool();
	EXPECT_EQ(0, GetAllPooledSessionsReturnCount());
	}

	TEST_F(PortAllocatorTest, RestrictIceCredentialsChange) {
	SetConfigurationWithPoolSize(1);
	EXPECT_EQ(1, GetAllPooledSessionsReturnCount());
	allocator_->DiscardCandidatePool();

	// Only return pooled sessions with the ice credentials that
	// match those requested in TakePooledSession().
	allocator_->set_restrict_ice_credentials_change(true);
	SetConfigurationWithPoolSize(1);
	EXPECT_EQ(0, GetAllPooledSessionsReturnCount());
	allocator_->DiscardCandidatePool();

	SetConfigurationWithPoolSize(1);
	auto credentials = allocator_->GetPooledIceCredentials();
	ASSERT_EQ(1u, credentials.size());
	EXPECT_EQ(nullptr,
	allocator_->TakePooledSession(kContentName, 0, kIceUfrag, kIcePwd));
	EXPECT_NE(nullptr,
	allocator_->TakePooledSession(kContentName, 0, credentials[0].ufrag,
	credentials[0].pwd));
	EXPECT_EQ(nullptr,
	allocator_->TakePooledSession(kContentName, 0, credentials[0].ufrag,
	credentials[0].pwd));
	allocator_->DiscardCandidatePool();
	}