daemon: automatic public nodes discovering and bootstrap daemon switching

1 files changed, 77 insertions, 33 deletions

diff --git a/src/rpc/core_rpc_server.cpp b/src/rpc/core_rpc_server.cpp
index 73138686d..4c07bddcb 100644
--- a/src/rpc/core_rpc_server.cpp
+++ b/src/rpc/core_rpc_server.cpp
@@ -116,20 +116,59 @@ namespace cryptonote
     return set_bootstrap_daemon(address, credentials);
   }
   //------------------------------------------------------------------------------------------------------------------------------
+  boost::optional<std::string> core_rpc_server::get_random_public_node()
+  {
+    COMMAND_RPC_GET_PUBLIC_NODES::request request;
+    COMMAND_RPC_GET_PUBLIC_NODES::response response;
+
+    request.gray = true;
+    request.white = true;
+    if (!on_get_public_nodes(request, response) || response.status != CORE_RPC_STATUS_OK)
+    {
+      return boost::none;
+    }
+
+    const auto get_random_node_address = [](const std::vector<public_node>& public_nodes) -> std::string {
+      const auto& random_node = public_nodes[crypto::rand_idx(public_nodes.size())];
+      const auto address = random_node.host + ":" + std::to_string(random_node.rpc_port);
+      return address;
+    };
+
+    if (!response.white.empty())
+    {
+      return get_random_node_address(response.white);
+    }
+
+    MDEBUG("No white public node found, checking gray peers");
+
+    if (!response.gray.empty())
+    {
+      return get_random_node_address(response.gray);
+    }
+
+    MERROR("Failed to find any suitable public node");
+
+    return boost::none;
+  }
+  //------------------------------------------------------------------------------------------------------------------------------
   bool core_rpc_server::set_bootstrap_daemon(const std::string &address, const boost::optional<epee::net_utils::http::login> &credentials)
   {
     boost::unique_lock<boost::shared_mutex> lock(m_bootstrap_daemon_mutex);
 
-    if (!address.empty())
+    if (address.empty())
     {
-      if (!m_http_client.set_server(address, credentials, epee::net_utils::ssl_support_t::e_ssl_support_autodetect))
-      {
-        return false;
-      }
+      m_bootstrap_daemon.reset(nullptr);
+    }
+    else if (address == "auto")
+    {
+      m_bootstrap_daemon.reset(new bootstrap_daemon([this]{ return get_random_public_node(); }));
+    }
+    else
+    {
+      m_bootstrap_daemon.reset(new bootstrap_daemon(address, credentials));
     }
 
-    m_bootstrap_daemon_address = address;   
-    m_should_use_bootstrap_daemon = !m_bootstrap_daemon_address.empty();
+    m_should_use_bootstrap_daemon = m_bootstrap_daemon.get() != nullptr;
 
     return true;
   }
@@ -220,7 +259,10 @@ namespace cryptonote
     {
       {
         boost::shared_lock<boost::shared_mutex> lock(m_bootstrap_daemon_mutex);
-        res.bootstrap_daemon_address = m_bootstrap_daemon_address;
+        if (m_bootstrap_daemon.get() != nullptr)
+        {
+          res.bootstrap_daemon_address = m_bootstrap_daemon->address();
+        }
       }
       crypto::hash top_hash;
       m_core.get_blockchain_top(res.height_without_bootstrap, top_hash);
@@ -269,7 +311,10 @@ namespace cryptonote
     else
     {
       boost::shared_lock<boost::shared_mutex> lock(m_bootstrap_daemon_mutex);
-      res.bootstrap_daemon_address = m_bootstrap_daemon_address;
+      if (m_bootstrap_daemon.get() != nullptr)
+      {
+        res.bootstrap_daemon_address = m_bootstrap_daemon->address();
+      }
       res.was_bootstrap_ever_used = m_was_bootstrap_ever_used;
     }
     res.database_size = m_core.get_blockchain_storage().get_db().get_database_size();
@@ -1593,8 +1638,10 @@ namespace cryptonote
 
     boost::upgrade_lock<boost::shared_mutex> upgrade_lock(m_bootstrap_daemon_mutex);
 
-    if (m_bootstrap_daemon_address.empty())
+    if (m_bootstrap_daemon.get() == nullptr)
+    {
       return false;
+    }
 
     if (!m_should_use_bootstrap_daemon)
     {
@@ -1610,42 +1657,38 @@ namespace cryptonote
         m_bootstrap_height_check_time = current_time;
       }
 
-      uint64_t top_height;
-      crypto::hash top_hash;
-      m_core.get_blockchain_top(top_height, top_hash);
-      ++top_height; // turn top block height into blockchain height
+      boost::optional<uint64_t> bootstrap_daemon_height = m_bootstrap_daemon->get_height();
+      if (!bootstrap_daemon_height)
+      {
+        MERROR("Failed to fetch bootstrap daemon height");
+        return false;
+      }
 
-      // query bootstrap daemon's height
-      cryptonote::COMMAND_RPC_GET_HEIGHT::request getheight_req;
-      cryptonote::COMMAND_RPC_GET_HEIGHT::response getheight_res;
-      bool ok = epee::net_utils::invoke_http_json("/getheight", getheight_req, getheight_res, m_http_client);
-      ok = ok && getheight_res.status == CORE_RPC_STATUS_OK;
+      uint64_t target_height = m_core.get_target_blockchain_height();
+      if (*bootstrap_daemon_height < target_height)
+      {
+        MINFO("Bootstrap daemon is out of sync");
+        return m_bootstrap_daemon->handle_result(false);
+      }
 
-      m_should_use_bootstrap_daemon = ok && top_height + 10 < getheight_res.height;
-      MINFO((m_should_use_bootstrap_daemon ? "Using" : "Not using") << " the bootstrap daemon (our height: " << top_height << ", bootstrap daemon's height: " << (ok ? getheight_res.height : 0) << ")");
+      uint64_t top_height = m_core.get_current_blockchain_height();
+      m_should_use_bootstrap_daemon = top_height + 10 < *bootstrap_daemon_height;
+      MINFO((m_should_use_bootstrap_daemon ? "Using" : "Not using") << " the bootstrap daemon (our height: " << top_height << ", bootstrap daemon's height: " << *bootstrap_daemon_height << ")");
     }
     if (!m_should_use_bootstrap_daemon)
       return false;
 
     if (mode == invoke_http_mode::JON)
     {
-      r = epee::net_utils::invoke_http_json(command_name, req, res, m_http_client);
+      r = m_bootstrap_daemon->invoke_http_json(command_name, req, res);
     }
     else if (mode == invoke_http_mode::BIN)
     {
-      r = epee::net_utils::invoke_http_bin(command_name, req, res, m_http_client);
+      r = m_bootstrap_daemon->invoke_http_bin(command_name, req, res);
     }
     else if (mode == invoke_http_mode::JON_RPC)
     {
-      epee::json_rpc::request<typename COMMAND_TYPE::request> json_req = AUTO_VAL_INIT(json_req);
-      epee::json_rpc::response<typename COMMAND_TYPE::response, std::string> json_resp = AUTO_VAL_INIT(json_resp);
-      json_req.jsonrpc = "2.0";
-      json_req.id = epee::serialization::storage_entry(0);
-      json_req.method = command_name;
-      json_req.params = req;
-      r = net_utils::invoke_http_json("/json_rpc", json_req, json_resp, m_http_client);
-      if (r)
-        res = json_resp.result;
+      r = m_bootstrap_daemon->invoke_http_json_rpc(command_name, req, res);
     }
     else
     {
@@ -2617,7 +2660,8 @@ namespace cryptonote
 
   const command_line::arg_descriptor<std::string> core_rpc_server::arg_bootstrap_daemon_address = {
       "bootstrap-daemon-address"
-    , "URL of a 'bootstrap' remote daemon that the connected wallets can use while this daemon is still not fully synced"
+    , "URL of a 'bootstrap' remote daemon that the connected wallets can use while this daemon is still not fully synced.\n"
+      "Use 'auto' to enable automatic public nodes discovering and bootstrap daemon switching"
     , ""
     };