42a4263728
To simplify things, the candidate pool is only used in the first offer/answer. After setting a local description, the size is frozen, and changing ICE servers won't refresh the pool. After setting an answer, the pooled candidates are discarded. BUG=webrtc:5180 Review-Url: https://codereview.webrtc.org/2717893003 Cr-Commit-Position: refs/heads/master@{#17178}
130 lines
4.1 KiB
C++
130 lines
4.1 KiB
C++
/*
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* Copyright 2004 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "webrtc/base/checks.h"
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#include "webrtc/p2p/base/portallocator.h"
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namespace cricket {
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PortAllocatorSession::PortAllocatorSession(const std::string& content_name,
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int component,
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const std::string& ice_ufrag,
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const std::string& ice_pwd,
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uint32_t flags)
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: flags_(flags),
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generation_(0),
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content_name_(content_name),
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component_(component),
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ice_ufrag_(ice_ufrag),
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ice_pwd_(ice_pwd) {
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// Pooled sessions are allowed to be created with empty content name,
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// component, ufrag and password.
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RTC_DCHECK(ice_ufrag.empty() == ice_pwd.empty());
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}
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bool PortAllocator::SetConfiguration(
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const ServerAddresses& stun_servers,
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const std::vector<RelayServerConfig>& turn_servers,
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int candidate_pool_size,
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bool prune_turn_ports) {
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bool ice_servers_changed =
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(stun_servers != stun_servers_ || turn_servers != turn_servers_);
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stun_servers_ = stun_servers;
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turn_servers_ = turn_servers;
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prune_turn_ports_ = prune_turn_ports;
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if (candidate_pool_frozen_) {
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if (candidate_pool_size != candidate_pool_size_) {
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LOG(LS_ERROR) << "Trying to change candidate pool size after pool was "
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<< "frozen.";
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return false;
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}
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return true;
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}
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if (candidate_pool_size < 0) {
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LOG(LS_ERROR) << "Can't set negative pool size.";
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return false;
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}
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candidate_pool_size_ = candidate_pool_size;
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// If ICE servers changed, throw away any existing pooled sessions and create
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// new ones.
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if (ice_servers_changed) {
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pooled_sessions_.clear();
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}
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// If |candidate_pool_size_| is less than the number of pooled sessions, get
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// rid of the extras.
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while (candidate_pool_size_ < static_cast<int>(pooled_sessions_.size())) {
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pooled_sessions_.front().reset(nullptr);
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pooled_sessions_.pop_front();
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}
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// If |candidate_pool_size_| is greater than the number of pooled sessions,
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// create new sessions.
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while (static_cast<int>(pooled_sessions_.size()) < candidate_pool_size_) {
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PortAllocatorSession* pooled_session = CreateSessionInternal("", 0, "", "");
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pooled_session->StartGettingPorts();
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pooled_sessions_.push_back(
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std::unique_ptr<PortAllocatorSession>(pooled_session));
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}
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return true;
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}
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std::unique_ptr<PortAllocatorSession> PortAllocator::CreateSession(
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const std::string& content_name,
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int component,
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const std::string& ice_ufrag,
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const std::string& ice_pwd) {
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auto session = std::unique_ptr<PortAllocatorSession>(
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CreateSessionInternal(content_name, component, ice_ufrag, ice_pwd));
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session->SetCandidateFilter(candidate_filter());
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return session;
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}
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std::unique_ptr<PortAllocatorSession> PortAllocator::TakePooledSession(
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const std::string& content_name,
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int component,
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const std::string& ice_ufrag,
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const std::string& ice_pwd) {
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RTC_DCHECK(!ice_ufrag.empty());
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RTC_DCHECK(!ice_pwd.empty());
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if (pooled_sessions_.empty()) {
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return nullptr;
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}
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std::unique_ptr<PortAllocatorSession> ret =
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std::move(pooled_sessions_.front());
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ret->SetIceParameters(content_name, component, ice_ufrag, ice_pwd);
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// According to JSEP, a pooled session should filter candidates only after
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// it's taken out of the pool.
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ret->SetCandidateFilter(candidate_filter());
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pooled_sessions_.pop_front();
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return ret;
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}
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const PortAllocatorSession* PortAllocator::GetPooledSession() const {
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if (pooled_sessions_.empty()) {
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return nullptr;
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}
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return pooled_sessions_.front().get();
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}
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void PortAllocator::FreezeCandidatePool() {
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candidate_pool_frozen_ = true;
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}
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void PortAllocator::DiscardCandidatePool() {
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pooled_sessions_.clear();
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}
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} // namespace cricket
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