[Connection] Remove friend clause for ConnectionRequest

* Switch to StunRequest where ConnectionRequest isn't needed.
* Move ConnectionRequest into Connection as a subclass
* Move declaration+implementation into the .cc file.

Bug: none
Change-Id: I1591a91d8e13a0db9f89cfbba0fbc9478a55b789
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/264150
Reviewed-by: Niels Moller <nisse@webrtc.org>
Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37036}

p2p/base/connection.cc

@@ -162,13 +162,27 @@ constexpr int kSupportGoogPingVersionResponseIndex =
 
 namespace cricket {
 
+class Connection::ConnectionRequest : public StunRequest {
+ public:
+  ConnectionRequest(StunRequestManager& manager, Connection* connection);
+  void Prepare(StunMessage* message) override;
+  void OnResponse(StunMessage* response) override;
+  void OnErrorResponse(StunMessage* response) override;
+  void OnTimeout() override;
+  void OnSent() override;
+  int resend_delay() override;
+
+ private:
+  Connection* const connection_;
+};
+
 // A ConnectionRequest is a STUN binding used to determine writability.
-ConnectionRequest::ConnectionRequest(StunRequestManager& manager,
-                                     Connection* connection)
+Connection::ConnectionRequest::ConnectionRequest(StunRequestManager& manager,
+                                                 Connection* connection)
     : StunRequest(manager, std::make_unique<IceMessage>()),
       connection_(connection) {}
 
-void ConnectionRequest::Prepare(StunMessage* message) {
+void Connection::ConnectionRequest::Prepare(StunMessage* message) {
   RTC_DCHECK_RUN_ON(connection_->network_thread_);
   message->SetType(STUN_BINDING_REQUEST);
   std::string username;
@@ -258,22 +272,22 @@ void ConnectionRequest::Prepare(StunMessage* message) {
   }
 }
 
-void ConnectionRequest::OnResponse(StunMessage* response) {
+void Connection::ConnectionRequest::OnResponse(StunMessage* response) {
   RTC_DCHECK_RUN_ON(connection_->network_thread_);
   connection_->OnConnectionRequestResponse(this, response);
 }
 
-void ConnectionRequest::OnErrorResponse(StunMessage* response) {
+void Connection::ConnectionRequest::OnErrorResponse(StunMessage* response) {
   RTC_DCHECK_RUN_ON(connection_->network_thread_);
   connection_->OnConnectionRequestErrorResponse(this, response);
 }
 
-void ConnectionRequest::OnTimeout() {
+void Connection::ConnectionRequest::OnTimeout() {
   RTC_DCHECK_RUN_ON(connection_->network_thread_);
   connection_->OnConnectionRequestTimeout(this);
 }
 
-void ConnectionRequest::OnSent() {
+void Connection::ConnectionRequest::OnSent() {
   RTC_DCHECK_RUN_ON(connection_->network_thread_);
   connection_->OnConnectionRequestSent(this);
   // Each request is sent only once.  After a single delay , the request will
@@ -281,7 +295,7 @@ void ConnectionRequest::OnSent() {
   set_timed_out();
 }
 
-int ConnectionRequest::resend_delay() {
+int Connection::ConnectionRequest::resend_delay() {
   return CONNECTION_RESPONSE_TIMEOUT;
 }
 
@@ -1313,7 +1327,7 @@ void Connection::LogCandidatePairEvent(webrtc::IceCandidatePairEventType type,
   ice_event_log_->LogCandidatePairEvent(type, id(), transaction_id);
 }
 
-void Connection::OnConnectionRequestResponse(ConnectionRequest* request,
+void Connection::OnConnectionRequestResponse(StunRequest* request,
                                              StunMessage* response) {
   RTC_DCHECK_RUN_ON(network_thread_);
   // Log at LS_INFO if we receive a ping response on an unwritable
@@ -1498,7 +1512,7 @@ ConnectionInfo Connection::stats() {
   return stats_;
 }
 
-void Connection::MaybeUpdateLocalCandidate(ConnectionRequest* request,
+void Connection::MaybeUpdateLocalCandidate(StunRequest* request,
                                            StunMessage* response) {
   // RFC 5245
   // The agent checks the mapped address from the STUN response.  If the

p2p/base/connection.h

@@ -55,21 +55,6 @@ struct CandidatePair final : public CandidatePairInterface {
   Candidate remote;
 };
 
-// A ConnectionRequest is a simple STUN ping used to determine writability.
-class ConnectionRequest : public StunRequest {
- public:
-  ConnectionRequest(StunRequestManager& manager, Connection* connection);
-  void Prepare(StunMessage* message) override;
-  void OnResponse(StunMessage* response) override;
-  void OnErrorResponse(StunMessage* response) override;
-  void OnTimeout() override;
-  void OnSent() override;
-  int resend_delay() override;
-
- private:
-  Connection* const connection_;
-};
-
 // Represents a communication link between a port on the local client and a
 // port on the remote client.
 class Connection : public CandidatePairInterface {
@@ -329,6 +314,9 @@ class Connection : public CandidatePairInterface {
   void set_remote_nomination(uint32_t remote_nomination);
 
  protected:
+  // A ConnectionRequest is a simple STUN ping used to determine writability.
+  class ConnectionRequest;
+
   // Constructs a new connection to the given remote port.
   Connection(rtc::WeakPtr<Port> port, size_t index, const Candidate& candidate);
 
@@ -336,7 +324,7 @@ class Connection : public CandidatePairInterface {
   void OnSendStunPacket(const void* data, size_t size, StunRequest* req);
 
   // Callbacks from ConnectionRequest
-  virtual void OnConnectionRequestResponse(ConnectionRequest* req,
+  virtual void OnConnectionRequestResponse(StunRequest* req,
                                            StunMessage* response);
   void OnConnectionRequestErrorResponse(ConnectionRequest* req,
                                         StunMessage* response)
@@ -380,8 +368,7 @@ class Connection : public CandidatePairInterface {
  private:
   // Update the local candidate based on the mapped address attribute.
   // If the local candidate changed, fires SignalStateChange.
-  void MaybeUpdateLocalCandidate(ConnectionRequest* request,
-                                 StunMessage* response)
+  void MaybeUpdateLocalCandidate(StunRequest* request, StunMessage* response)
       RTC_RUN_ON(network_thread_);
 
   void LogCandidatePairConfig(webrtc::IceCandidatePairConfigType type)
@@ -467,8 +454,6 @@ class Connection : public CandidatePairInterface {
   const IceFieldTrials* field_trials_;
   rtc::EventBasedExponentialMovingAverage rtt_estimate_
       RTC_GUARDED_BY(network_thread_);
-
-  friend class ConnectionRequest;
 };
 
 // ProxyConnection defers all the interesting work to the port.

p2p/base/tcp_port.cc

@@ -419,7 +419,7 @@ int TCPConnection::GetError() {
   return error_;
 }
 
-void TCPConnection::OnConnectionRequestResponse(ConnectionRequest* req,
+void TCPConnection::OnConnectionRequestResponse(StunRequest* req,
                                                 StunMessage* response) {
   // Process the STUN response before we inform upper layer ready to send.
   Connection::OnConnectionRequestResponse(req, response);

p2p/base/tcp_port.h

@@ -148,7 +148,7 @@ class TCPConnection : public Connection, public sigslot::has_slots<> {
  protected:
   // Set waiting_for_stun_binding_complete_ to false to allow data packets in
   // addition to what Port::OnConnectionRequestResponse does.
-  void OnConnectionRequestResponse(ConnectionRequest* req,
+  void OnConnectionRequestResponse(StunRequest* req,
                                    StunMessage* response) override;
 
  private: