[feat] Implementation for trickle ice

src/ice/ice_agent.cpp

@@ -24,12 +24,15 @@ IceAgent::~IceAgent() {
 }
 
 int IceAgent::CreateIceAgent(nice_cb_state_changed_t on_state_changed,
-                             nice_cb_candidate_t on_candidate,
+                             nice_cb_new_candidate_t on_new_candidate,
                              nice_cb_gathering_done_t on_gathering_done,
+                             nice_cb_new_selected_pair_t on_new_selected_pair,
                              nice_cb_recv_t on_recv, void *user_ptr) {
   destroyed_ = false;
   on_state_changed_ = on_state_changed;
-  on_candidate_ = on_candidate;
+  on_new_selected_pair_ = on_new_selected_pair;
+  on_new_candidate_ = on_new_candidate;
+
   on_gathering_done_ = on_gathering_done;
   on_recv_ = on_recv;
   user_ptr_ = user_ptr;
@@ -41,9 +44,9 @@ int IceAgent::CreateIceAgent(nice_cb_state_changed_t on_state_changed,
   nice_thread_.reset(new std::thread([this]() {
     gloop_ = g_main_loop_new(nullptr, false);
 
-    agent_ = nice_agent_new_full(g_main_loop_get_context(gloop_),
-                                 NICE_COMPATIBILITY_RFC5245,
-                                 (NiceAgentOption)(NICE_AGENT_OPTION_RELIABLE));
+    agent_ = nice_agent_new_full(
+        g_main_loop_get_context(gloop_), NICE_COMPATIBILITY_RFC5245,
+        (NiceAgentOption)(NICE_AGENT_OPTION_ICE_TRICKLE));
 
     if (agent_ == nullptr) {
       LOG_ERROR("Failed to create agent_");
@@ -51,30 +54,37 @@ int IceAgent::CreateIceAgent(nice_cb_state_changed_t on_state_changed,
 
     g_object_set(agent_, "stun-server", stun_ip_.c_str(), nullptr);
     g_object_set(agent_, "stun-server-port", stun_port_, nullptr);
-
     g_object_set(agent_, "controlling-mode", controlling_, nullptr);
+    // g_object_set(agent_, "ice-trickle", true, nullptr);
 
     g_signal_connect(agent_, "candidate-gathering-done",
                      G_CALLBACK(on_gathering_done_), user_ptr_);
-    g_signal_connect(agent_, "new-selected-pair", G_CALLBACK(on_candidate_),
+    g_signal_connect(agent_, "new-selected-pair",
+                     G_CALLBACK(on_new_selected_pair_), user_ptr_);
+    g_signal_connect(agent_, "new-candidate", G_CALLBACK(on_new_candidate_),
                      user_ptr_);
     g_signal_connect(agent_, "component-state-changed",
                      G_CALLBACK(on_state_changed_), user_ptr_);
 
-    stream_id_ = nice_agent_add_stream(agent_, 1);
+    stream_id_ = nice_agent_add_stream(agent_, n_components_);
     if (stream_id_ == 0) {
       LOG_ERROR("Failed to add stream");
     }
 
     nice_agent_set_stream_name(agent_, stream_id_, "video");
 
-    nice_agent_set_relay_info(agent_, stream_id_, 1, turn_ip_.c_str(),
-                              turn_port_, turn_username_.c_str(),
-                              turn_password_.c_str(), NICE_RELAY_TYPE_TURN_UDP);
+    nice_agent_set_relay_info(agent_, stream_id_, n_components_,
+                              turn_ip_.c_str(), turn_port_,
+                              turn_username_.c_str(), turn_password_.c_str(),
+                              NICE_RELAY_TYPE_TURN_UDP);
 
-    // g_object_set(agent_, "force-relay", true, NULL);
+    // g_object_set(agent_, "ice-tcp", false, "ice-udp", true, "force-relay",
+    // true,
+    //              NULL);
 
-    nice_agent_attach_recv(agent_, stream_id_, 1,
+    // nice_agent_set_remote_credentials(agent_, stream_id_, ufrag, password);
+
+    nice_agent_attach_recv(agent_, stream_id_, NICE_COMPONENT_TYPE_RTP,
                            g_main_loop_get_context(gloop_), on_recv_,
                            user_ptr_);
 
@@ -120,6 +130,32 @@ int IceAgent::DestroyIceAgent() {
   return 0;
 }
 
+int IceAgent::GetLocalCredentials() {
+  if (!nice_inited_) {
+    LOG_ERROR("Nice agent has not been initialized");
+    return -1;
+  }
+
+  if (nullptr == agent_) {
+    LOG_ERROR("Nice agent is nullptr");
+    return -1;
+  }
+
+  if (destroyed_) {
+    LOG_ERROR("Nice agent is destroyed");
+    return -1;
+  }
+
+  nice_agent_get_local_credentials(agent_, stream_id_, &ice_ufrag_,
+                                   &ice_password_);
+
+  return 0;
+}
+
+char *IceAgent::GetLocalUfrag() { return ufrag_; }
+
+char *IceAgent::GetLocalPassword() { return password_; }
+
 char *IceAgent::GenerateLocalSdp() {
   if (!nice_inited_) {
     LOG_ERROR("Nice agent has not been initialized");
@@ -162,11 +198,38 @@ int IceAgent::SetRemoteSdp(const char *remote_sdp) {
   if (ret > 0) {
     return 0;
   } else {
-    LOG_ERROR("Failed to parse remote data");
+    LOG_ERROR("Failed to parse remote data: [{}]", remote_sdp);
     return -1;
   }
 }
 
+int IceAgent::AddCandidate(const char *candidate) {
+  if (!nice_inited_) {
+    LOG_ERROR("Nice agent has not been initialized");
+    return -1;
+  }
+
+  if (nullptr == agent_) {
+    LOG_ERROR("Nice agent is nullptr");
+    return -1;
+  }
+
+  if (destroyed_) {
+    LOG_ERROR("Nice agent is destroyed");
+    return -1;
+  }
+
+  int ret = nice_agent_parse_remote_sdp(agent_, candidate);
+  if (ret > 0) {
+    return 0;
+  } else {
+    LOG_ERROR("Failed to parse remote candidate: [{}]", candidate);
+    return -1;
+  }
+
+  return 0;
+}
+
 int IceAgent::GatherCandidates() {
   if (!nice_inited_) {
     LOG_ERROR("Nice agent has not been initialized");

src/ice/ice_agent.h

@@ -13,8 +13,13 @@ typedef void (*nice_cb_state_changed_t)(NiceAgent* agent, guint stream_id,
                                         guint component_id,
                                         NiceComponentState state,
                                         gpointer data);
-typedef void (*nice_cb_candidate_t)(NiceAgent* agent, guint stream_id,
-                                    guint component_id, const char* sdp,
+typedef void (*nice_cb_new_candidate_t)(NiceAgent* agent, guint stream_id,
+                                        guint component_id, gchar* foundation,
+                                        gpointer data);
+typedef void (*nice_cb_new_selected_pair_t)(NiceAgent* agent, guint stream_id,
+                                            guint component_id,
+                                            const char* lfoundation,
+                                            const char* rfoundation,
                                             gpointer data);
 typedef void (*nice_cb_gathering_done_t)(NiceAgent* agent, guint stream_id,
                                          gpointer data);
@@ -30,16 +35,25 @@ class IceAgent {
   ~IceAgent();
 
   int CreateIceAgent(nice_cb_state_changed_t on_state_changed,
-                     nice_cb_candidate_t on_candidate,
+                     nice_cb_new_candidate_t on_new_candidate,
                      nice_cb_gathering_done_t on_gathering_done,
+                     nice_cb_new_selected_pair_t on_new_selected_pair,
                      nice_cb_recv_t on_recv, void* user_ptr);
 
   int DestroyIceAgent();
 
+  int GetLocalCredentials();
+
+  char* GetLocalIceUfrag();
+
+  char* GetLocalIcePassword();
+
   char* GenerateLocalSdp();
 
   int SetRemoteSdp(const char* remote_sdp);
 
+  int AddCandidate(const char* candidate);
+
   int GatherCandidates();
 
   NiceComponentState GetIceState();
@@ -63,14 +77,18 @@ class IceAgent {
 
   gboolean exit_nice_thread_ = false;
   bool controlling_ = false;
+  gchar* ice_ufrag_ = nullptr;
+  gchar* ice_password_ = nullptr;
   uint32_t stream_id_ = 0;
+  uint32_t n_components_ = 1;
   char* local_sdp_ = nullptr;
   NiceComponentState state_ = NiceComponentState::NICE_COMPONENT_STATE_LAST;
   bool destroyed_ = false;
   gboolean agent_closed_ = false;
 
   nice_cb_state_changed_t on_state_changed_;
-  nice_cb_candidate_t on_candidate_;
+  nice_cb_new_selected_pair_t on_new_selected_pair_;
+  nice_cb_new_candidate_t on_new_candidate_;
   nice_cb_gathering_done_t on_gathering_done_;
   nice_cb_recv_t on_recv_;
   void* user_ptr_;

src/pc/peer_connection.cpp

@@ -525,6 +525,25 @@ void PeerConnection::ProcessSignal(const std::string &signal) {
       }
       break;
     }
+    case "offer_candidate"_H: {
+      std::string transmission_id = j["transmission_id"].get<std::string>();
+      std::string new_candidate = j["sdp"].get<std::string>();
+      std::string remote_user_id = j["remote_user_id"].get<std::string>();
+
+      LOG_INFO("[{}] receive new candidate from [{}]", user_id_,
+               remote_user_id);
+
+      if (ice_transmission_list_.find(remote_user_id) !=
+          ice_transmission_list_.end()) {
+        ice_transmission_list_[remote_user_id]->AddCandidate(new_candidate);
+      }
+      break;
+    }
+    case "answer_candidate"_H: {
+      std::string transmission_id = j["transmission_id"].get<std::string>();
+      std::string new_candidate = j["sdp"].get<std::string>();
+      break;
+    }
     default: {
       break;
     }

src/transmission/ice_transmission.cpp

@@ -167,24 +167,59 @@ int IceTransmission::InitIceTransmission(
           LOG_INFO("state_change: {}", nice_component_state_to_string(state));
         }
       },
-      [](NiceAgent *agent, guint stream_id, guint component_id, const char *sdp,
-         gpointer user_ptr) { LOG_INFO("candadite: {}", sdp); },
-      [](NiceAgent *agent, guint stream_id, gpointer user_ptr) {
-        // non-trickle
+      [](NiceAgent *agent, guint stream_id, guint component_id,
+         gchar *foundation, gpointer user_ptr) {
         if (user_ptr) {
           IceTransmission *ice_transmission_obj =
               static_cast<IceTransmission *>(user_ptr);
-          LOG_INFO("[{}] gather_done", ice_transmission_obj->user_id_);
 
-          if (ice_transmission_obj->offer_peer_) {
-            ice_transmission_obj->GetLocalSdp();
-            ice_transmission_obj->SendOffer();
+          GSList *cands =
+              nice_agent_get_local_candidates(agent, stream_id, component_id);
+          NiceCandidate *cand;
+          for (GSList *i = cands; i; i = i->next) {
+            cand = (NiceCandidate *)i->data;
+            if (g_strcmp0(cand->foundation, foundation) == 0) {
+              ice_transmission_obj->new_local_candidate_ =
+                  nice_agent_generate_local_sdp(agent);
 
-          } else {
-            ice_transmission_obj->CreateAnswer();
-            ice_transmission_obj->SendAnswer();
+              json message = {
+                  {"type", "offer_candidate"},
+                  {"transmission_id", ice_transmission_obj->transmission_id_},
+                  {"user_id", ice_transmission_obj->user_id_},
+                  {"remote_user_id", ice_transmission_obj->remote_user_id_},
+                  {"sdp", ice_transmission_obj->new_local_candidate_}};
+              LOG_INFO("Send new local candidate sdp:[{}]",
+                       ice_transmission_obj->new_local_candidate_);
+
+              if (ice_transmission_obj->ice_ws_transport_) {
+                ice_transmission_obj->ice_ws_transport_->Send(message.dump());
               }
             }
+          }
+
+          g_slist_free_full(cands, (GDestroyNotify)nice_candidate_free);
+        }
+      },
+      [](NiceAgent *agent, guint stream_id, gpointer user_ptr) {
+        // non-trickle
+        // if (user_ptr) {
+        //   IceTransmission *ice_transmission_obj =
+        //       static_cast<IceTransmission *>(user_ptr);
+        //   LOG_INFO("[{}] gather_done", ice_transmission_obj->user_id_);
+
+        //   if (ice_transmission_obj->offer_peer_) {
+        //     ice_transmission_obj->GetLocalSdp();
+        //     ice_transmission_obj->SendOffer();
+
+        //   } else {
+        //     ice_transmission_obj->CreateAnswer();
+        //     ice_transmission_obj->SendAnswer();
+        //   }
+        // }
+      },
+      [](NiceAgent *agent, guint stream_id, guint component_id,
+         const char *lfoundation, const char *rfoundation, gpointer user_ptr) {
+        LOG_INFO("new selected pair: [{}] [{}]", lfoundation, rfoundation);
       },
       [](NiceAgent *agent, guint stream_id, guint component_id, guint size,
          gchar *buffer, gpointer user_ptr) {
@@ -257,9 +292,37 @@ int IceTransmission::SetRemoteSdp(const std::string &remote_sdp) {
   return 0;
 }
 
+int IceTransmission::AddCandidate(const std::string &candidate) {
+  ice_agent_->AddCandidate(candidate.c_str());
+  LOG_INFO("[{}] add candidate", user_id_);
+  return 0;
+}
+
 int IceTransmission::CreateOffer() {
   LOG_INFO("[{}] create offer", user_id_);
   GatherCandidates();
+
+  if (trickle_ice_) {
+    SendLocalCredentials();
+  }
+  return 0;
+}
+
+int IceTransmission::SendLocalCredentials() {
+  ice_agent_->GetLocalIceUfrag();
+  ice_agent_->GetLocalIcePassword();
+
+  json message = {{"type", "credentials"},
+                  {"transmission_id", transmission_id_},
+                  {"user_id", user_id_},
+                  {"remote_user_id", remote_user_id_},
+                  {"ufrag", ice_agent_->GetLocalIceUfrag()},
+                  {"password", ice_agent_->GetLocalIcePassword()}};
+  LOG_INFO("Send credentials:\n{}", message.dump());
+
+  if (ice_ws_transport_) {
+    ice_ws_transport_->Send(message.dump());
+  }
   return 0;
 }
 

src/transmission/ice_transmission.h

@@ -80,10 +80,14 @@ class IceTransmission {
  public:
   int GatherCandidates();
 
+  int SendLocalCredentials();
+
   int GetLocalSdp();
 
   int SetRemoteSdp(const std::string &remote_sdp);
 
+  int AddCandidate(const std::string &candidate);
+
   int CreateOffer();
 
   int SendOffer();
@@ -99,8 +103,10 @@ class IceTransmission {
   uint8_t CheckIsDataPacket(const char *buffer, size_t size);
 
  private:
+  bool trickle_ice_ = true;
   std::string local_sdp_;
   std::string remote_sdp_;
+  std::string new_local_candidate_;
   std::string local_candidates_;
   std::string remote_candidates_;
   unsigned int connection_id_ = 0;