proxyserver: generate id before put

include/opendht/dht_proxy_server.h

@@ -316,6 +316,7 @@ private:
     std::shared_ptr<DhtRunner> dht_;
     Json::StreamWriterBuilder jsonBuilder_;
     Json::CharReaderBuilder jsonReaderBuilder_;
+    std::mt19937_64 rd {crypto::getSeededRandomEngine<std::mt19937_64>()};
 
     // http server
     std::thread serverThread_;

src/dht_proxy_server.cpp

@@ -964,6 +964,8 @@ DhtProxyServer::put(restinio::request_handle_t request,
                             return response.done();
                         }
                     }
+                    if (value->id == Value::INVALID_ID)
+                        value->id = std::uniform_int_distribution<Value::Id>{1}(rd);
                 }
 
                 auto vid = value->id;