checking if connection to deamon exists

src/page.h

@@ -44,7 +44,6 @@ namespace xmreg {
 
     class page {
 
-
         MicroCore* mcore;
         Blockchain* core_storage;
         rpccalls rpc;
@@ -56,14 +55,22 @@ namespace xmreg {
                 : mcore {_mcore},
                   core_storage {_core_storage},
                   server_timestamp {std::time(nullptr)}
-
         {
-
         }
 
         string
         index(uint64_t page_no = 0, bool refresh_page = false)
         {
+
+            bool is_connected = rpc.check_connection();
+
+            cout << "check connection: " << is_connected << endl;
+
+            if (!is_connected)
+            {
+                return "Connection to the Monero demon does not exist or was lost!";
+            }
+
             //get current server timestamp
             server_timestamp = std::time(nullptr);
 
@@ -87,7 +94,6 @@ namespace xmreg {
                     {"is_page_zero"    , !bool(page_no)},
                     {"next_page"       , fmt::format("{:d}", page_no + 1)},
                     {"prev_page"       , fmt::format("{:d}", (page_no > 0 ? page_no - 1 : 0))},
-
             };
 
 
@@ -115,7 +121,11 @@ namespace xmreg {
                 // get block at the given height i
                 block blk;
 
-                mcore->get_block_by_height(i, blk);
+                if (!mcore->get_block_by_height(i, blk))
+                {
+                    cerr << "Cant get block: " << i << endl;
+                    continue;
+                }
 
                 // get block's hash
                 crypto::hash blk_hash = core_storage->get_block_id_by_height(i);
@@ -238,7 +248,6 @@ namespace xmreg {
         string
         mempool()
         {
-
             std::vector<tx_info> mempool_txs;
 
             if (!rpc.get_mempool(mempool_txs))
@@ -313,7 +322,6 @@ namespace xmreg {
 
     private:
 
-
         uint64_t
         sum_xmr_outputs(const string& json_str)
         {

src/rpccalls.h

@@ -23,27 +23,45 @@ namespace xmreg
     class rpccalls
     {
         string deamon_url {"http:://127.0.0.1:18081"};
-        uint64_t timeout_time {200000};
+        uint64_t timeout_time {20000};
+
+        epee::net_utils::http::url_content url;
+
+        http_simple_client m_http_client;
+        boost::mutex m_daemon_rpc_mutex;
+
+        string port;
 
     public:
 
+        rpccalls()
+        {
+            epee::net_utils::parse_url(deamon_url, url);
+
+            port = std::to_string(url.port);
+        }
+
+        bool
+        check_connection()
+        {
+            m_daemon_rpc_mutex.lock();
+
+            return m_http_client.connect(url.host,
+                                         port,
+                                         timeout_time);
+        }
+
         uint64_t
         get_current_height()
         {
             COMMAND_RPC_GET_HEIGHT::request   req;
             COMMAND_RPC_GET_HEIGHT::response  res;
 
-            http_simple_client m_http_client;
-
-            // perform RPC call to deamon to get
-            // its transaction pull
-            boost::mutex m_daemon_rpc_mutex;
-
             m_daemon_rpc_mutex.lock();
 
             bool r = epee::net_utils::invoke_http_json_remote_command2(
                     deamon_url + "/getheight",
-                    req, res, m_http_client, 200000);
+                    req, res, m_http_client, timeout_time);
 
             m_daemon_rpc_mutex.unlock();
 
@@ -67,15 +85,11 @@ namespace xmreg
             COMMAND_RPC_GET_TRANSACTION_POOL::request  req;
             COMMAND_RPC_GET_TRANSACTION_POOL::response res;
 
-            http_simple_client m_http_client;
-
-            boost::mutex m_daemon_rpc_mutex;
-
             m_daemon_rpc_mutex.lock();
 
             bool r = epee::net_utils::invoke_http_json_remote_command2(
                     deamon_url + "/get_transaction_pool",
-                    req, res, m_http_client, 200000);
+                    req, res, m_http_client, timeout_time);
 
             m_daemon_rpc_mutex.unlock();