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/*
* Copyright 2015 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.
*/
#ifndef WEBRTC_P2P_BASE_TRANSPORTCONTROLLER_H_
#define WEBRTC_P2P_BASE_TRANSPORTCONTROLLER_H_
#include <map>
#include <string>
#include <vector>
#include "webrtc/base/sigslot.h"
#include "webrtc/base/sslstreamadapter.h"
#include "webrtc/p2p/base/candidate.h"
#include "webrtc/p2p/base/transport.h"
namespace rtc {
class Thread;
}
namespace cricket {
class TransportController : public sigslot::has_slots<>,
public rtc::MessageHandler {
public:
TransportController(rtc::Thread* signaling_thread,
rtc::Thread* worker_thread,
PortAllocator* port_allocator);
virtual ~TransportController();
rtc::Thread* signaling_thread() const { return signaling_thread_; }
rtc::Thread* worker_thread() const { return worker_thread_; }
PortAllocator* port_allocator() const { return port_allocator_; }
// Can only be set before transports are created.
// TODO(deadbeef): Make this an argument to the constructor once BaseSession
// and WebRtcSession are combined
bool SetSslMaxProtocolVersion(rtc::SSLProtocolVersion version);
void SetIceConfig(const IceConfig& config);
void SetIceRole(IceRole ice_role);
// TODO(deadbeef) - Return role of each transport, as role may differ from
// one another.
// In current implementaion we just return the role of the first transport
// alphabetically.
bool GetSslRole(rtc::SSLRole* role);
// Specifies the identity to use in this session.
// Can only be called once.
bool SetLocalCertificate(
const rtc::scoped_refptr<rtc::RTCCertificate>& certificate);
bool GetLocalCertificate(
const std::string& transport_name,
rtc::scoped_refptr<rtc::RTCCertificate>* certificate);
// Caller owns returned certificate
bool GetRemoteSSLCertificate(const std::string& transport_name,
rtc::SSLCertificate** cert);
bool SetLocalTransportDescription(const std::string& transport_name,
const TransportDescription& tdesc,
ContentAction action,
std::string* err);
bool SetRemoteTransportDescription(const std::string& transport_name,
const TransportDescription& tdesc,
ContentAction action,
std::string* err);
// Start gathering candidates for any new transports, or transports doing an
// ICE restart.
void MaybeStartGathering();
bool AddRemoteCandidates(const std::string& transport_name,
const Candidates& candidates,
std::string* err);
bool ReadyForRemoteCandidates(const std::string& transport_name);
bool GetStats(const std::string& transport_name, TransportStats* stats);
// Creates a channel if it doesn't exist. Otherwise, increments a reference
// count and returns an existing channel.
virtual TransportChannel* CreateTransportChannel_w(
const std::string& transport_name,
int component);
// Decrements a channel's reference count, and destroys the channel if
// nothing is referencing it.
virtual void DestroyTransportChannel_w(const std::string& transport_name,
int component);
// All of these signals are fired on the signalling thread.
// If any transport failed => failed,
// Else if all completed => completed,
// Else if all connected => connected,
// Else => connecting
sigslot::signal1<IceConnectionState> SignalConnectionState;
// Receiving if any transport is receiving
sigslot::signal1<bool> SignalReceiving;
// If all transports done gathering => complete,
// Else if any are gathering => gathering,
// Else => new
sigslot::signal1<IceGatheringState> SignalGatheringState;
// (transport_name, candidates)
sigslot::signal2<const std::string&, const Candidates&>
SignalCandidatesGathered;
// for unit test
const rtc::scoped_refptr<rtc::RTCCertificate>& certificate_for_testing();
protected:
// Protected and virtual so we can override it in unit tests.
virtual Transport* CreateTransport_w(const std::string& transport_name);
// For unit tests
const std::map<std::string, Transport*>& transports() { return transports_; }
Transport* GetTransport_w(const std::string& transport_name);
private:
void OnMessage(rtc::Message* pmsg) override;
// It's the Transport that's currently responsible for creating/destroying
// channels, but the TransportController keeps track of how many external
// objects (BaseChannels) reference each channel.
struct RefCountedChannel {
RefCountedChannel() : impl_(nullptr), ref_(0) {}
explicit RefCountedChannel(TransportChannelImpl* impl)
: impl_(impl), ref_(0) {}
void AddRef() { ++ref_; }
void DecRef() {
ASSERT(ref_ > 0);
--ref_;
}
int ref() const { return ref_; }
TransportChannelImpl* get() const { return impl_; }
TransportChannelImpl* operator->() const { return impl_; }
private:
TransportChannelImpl* impl_;
int ref_;
};
std::vector<RefCountedChannel>::iterator FindChannel_w(
const std::string& transport_name,
int component);
Transport* GetOrCreateTransport_w(const std::string& transport_name);
void DestroyTransport_w(const std::string& transport_name);
void DestroyAllTransports_w();
bool SetSslMaxProtocolVersion_w(rtc::SSLProtocolVersion version);
void SetIceConfig_w(const IceConfig& config);
void SetIceRole_w(IceRole ice_role);
bool GetSslRole_w(rtc::SSLRole* role);
bool SetLocalCertificate_w(
const rtc::scoped_refptr<rtc::RTCCertificate>& certificate);
bool GetLocalCertificate_w(
const std::string& transport_name,
rtc::scoped_refptr<rtc::RTCCertificate>* certificate);
bool GetRemoteSSLCertificate_w(const std::string& transport_name,
rtc::SSLCertificate** cert);
bool SetLocalTransportDescription_w(const std::string& transport_name,
const TransportDescription& tdesc,
ContentAction action,
std::string* err);
bool SetRemoteTransportDescription_w(const std::string& transport_name,
const TransportDescription& tdesc,
ContentAction action,
std::string* err);
void MaybeStartGathering_w();
bool AddRemoteCandidates_w(const std::string& transport_name,
const Candidates& candidates,
std::string* err);
bool ReadyForRemoteCandidates_w(const std::string& transport_name);
bool GetStats_w(const std::string& transport_name, TransportStats* stats);
// Handlers for signals from Transport.
void OnChannelWritableState_w(TransportChannel* channel);
void OnChannelReceivingState_w(TransportChannel* channel);
void OnChannelGatheringState_w(TransportChannelImpl* channel);
void OnChannelCandidateGathered_w(TransportChannelImpl* channel,
const Candidate& candidate);
void OnChannelRoleConflict_w(TransportChannelImpl* channel);
void OnChannelConnectionRemoved_w(TransportChannelImpl* channel);
void UpdateAggregateStates_w();
rtc::Thread* const signaling_thread_ = nullptr;
rtc::Thread* const worker_thread_ = nullptr;
typedef std::map<std::string, Transport*> TransportMap;
TransportMap transports_;
std::vector<RefCountedChannel> channels_;
PortAllocator* const port_allocator_ = nullptr;
rtc::SSLProtocolVersion ssl_max_version_ = rtc::SSL_PROTOCOL_DTLS_10;
// Aggregate state for TransportChannelImpls.
IceConnectionState connection_state_ = kIceConnectionConnecting;
bool receiving_ = false;
IceGatheringState gathering_state_ = kIceGatheringNew;
// TODO(deadbeef): Move the fields below down to the transports themselves
IceConfig ice_config_;
IceRole ice_role_ = ICEROLE_CONTROLLING;
// Flag which will be set to true after the first role switch
bool ice_role_switch_ = false;
uint64_t ice_tiebreaker_ = rtc::CreateRandomId64();
rtc::scoped_refptr<rtc::RTCCertificate> certificate_;
};
} // namespace cricket
#endif // WEBRTC_P2P_BASE_TRANSPORTCONTROLLER_H_
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