Rewrite async with pool connection. Fix timeout bug in pull method and define exceptions

.vscode/settings.json

@@ -44,6 +44,8 @@
         "stdexcept": "cpp",
         "streambuf": "cpp",
         "cinttypes": "cpp",
-        "typeinfo": "cpp"
+        "typeinfo": "cpp",
+        "thread": "cpp",
+        "chrono": "cpp"
     }
 }

.vscode/tasks.json

@@ -6,11 +6,11 @@
             "command": "/usr/bin/g++",
             "args": [
                 "-g",
-                "${fileDirname}/client.cpp",
+                "${fileDirname}/server.cpp",
                 "${fileDirname}/../src/*.cpp",
                 // "${fileDirname}../include/*/src/*.cpp",
                 "-o",
-                "${fileDirname}/client.o",
+                "${fileDirname}/server.o",
                 "-lssl",
                 "-lcrypto"
             ],

lib/ip.hpp

@@ -4,9 +4,16 @@
 #include <iostream>
 #include <string>
 #include <string.h>
-#include <arpa/inet.h>
+
-#include <netdb.h>
+#if __linux__
-#include <unistd.h>
+    #include <arpa/inet.h>
+    #include <netdb.h>
+    #include <unistd.h>
+#elif _WIN32
+    // #include <sstream>
+    #include <WinSock.h>
+    #include <ws2tcpip.h>
+#endif
 
 using namespace std;
 

lib/tcp_socket.hpp

@@ -3,16 +3,40 @@
 
 #include <iostream>
 #include <string>
+#include <vector>
+#include <thread>
+#include <mutex>
 #include <string.h>
-#include <arpa/inet.h>
+#include <errno.h>
-#include <netdb.h>
+#include <chrono>
-#include <unistd.h>
+#include <stdexcept>
+
 #include <openssl/ssl.h>
 #include <openssl/err.h>
 
+#define SOCKET_TIMEOUT 1000;    // timeout u us
+
+#if __linux__
+    #include <arpa/inet.h>
+    #include <netdb.h>
+    #include <unistd.h>
+#elif _WIN32
+    #include <WinSock.h>
+    #include <ws2tcpip.h>
+    #pragma comment(lib,"ws2_32.lib")
+    #define ushort u_short
+    #define uint u_int
+#endif
+
 #include "ip.hpp"
 
 using namespace std;
+using namespace chrono;
+
+class client;
+// class secure;
+// class server;
+
 
 /**
  * Server klasa za TCP/IP soket
@@ -21,12 +45,22 @@ using namespace std;
 
 class server {
     public:
-    int sock;
+    #if __linux__
+        int sock;
+    #elif _WIN32
+        WSADATA wsa;
+        SOCKET sock;
+    #endif
     struct sockaddr_in addr;
+    SSL_CTX* securefds = NULL;
+    vector<thread> thr;
 
-    server (const ushort port, const uint limit = 1000);
+    server (const ushort port, const uint queue = 1000, SSL_CTX* _securefds = NULL);
     ~server ();
 
+    void sync(void (*handlecli)(client&), const uint timeout = 100);
+    void async(const uint limit, void (*handlecli)(client&), const uint timeout = 100);
+
 };
 
 /**
@@ -51,40 +85,52 @@ class secure {
 
 class client {
     public:
-    int sock;
+    // zajedničke
+    #if __linux__
+        int conn; // mijenja sock
+    #elif _WIN32
+        WSADATA wsa;
+        SOCKET conn; // mijenja sock
+    #endif
     struct sockaddr_in addr;
     SSL* ssl = NULL;
-
+    uint _timeout = 100; // timeout u ms
+    // server s klijentima
+    const server* srv;
+    // klijent sa serverom
+    string ipv4;
+    string ipv6;
+    
+    // konstruktor za klijente bez servera
     client (const string address, const ushort port, const uint timeout = 100, SSL_CTX* securefds = NULL);
+    // konstruktor za klijente sa serverom
+    client (const server *_srv, const uint timeout = 100, SSL_CTX* securefds = NULL);
     ~client ();
-    bool tell (const string msg);
+    bool push (const string msg);
-    string obey (size_t byte_limit = 1024);
+    string pull (size_t byte_limit = 1024);
 };
 
 
-/**
+class ConnectionException : public exception {
- * Klasa za inicijalizaciju dolaznih veza
+public:
- * Definira se na serverskom tipu aplikacija i predstavlja identifikator klijenta
+    ConnectionException(const string& message, const string& data, const bool& interrupted = false): message_(message), data_(data), interrupted_(interrupted) {}
-*/
 
-class comming {
+    virtual const char* what() const noexcept {
-    public:
+        return message_.c_str();
-    const server *srv;
+    }
-    struct sockaddr_in addr;
-    int conn;
-    string ipv4;
-    string ipv6;
-    SSL* ssl = NULL;
 
-    comming(const server *_srv, const uint timeout = 100, SSL_CTX* securefds = NULL);
+    const string& getData() const {
-    ~comming();
+        return data_;
-    bool tell (const string msg);
+    }
-    string obey (size_t byte_limit = 1024);
 
+    const bool& isInterrupted() const {
+        return interrupted_;
+    }
 
+private:
+    string message_;
+    string data_;
+    bool interrupted_;
 };
 
-
-
-
 #endif

src/tcp_socket.cpp

@@ -4,12 +4,19 @@
  * Kontrustruktor varijable tipa server, prima port i limit za ograničenje liste klijenata na čekanju
 */
 
-server::server (const ushort port, const uint limit) {
+server::server (const ushort port, const uint queue, SSL_CTX* _securefds) {
+    securefds = _securefds;         
 
     addr.sin_family = AF_INET;
     addr.sin_addr.s_addr = INADDR_ANY;
     addr.sin_port = htons(port);
 
+    #if _WIN32
+        if (WSAStartup(MAKEWORD(2,2),&wsa) != 0) {
+            throw string("[ERROR] WSA Startup. Detail: " + to_string(WSAGetLastError()));
+        }
+    #endif
+
     sock = socket(AF_INET, SOCK_STREAM, 0); 
     if (sock <= 0) {  
         throw string("[ERROR] Unable to open TCP socket ");
@@ -17,20 +24,69 @@ server::server (const ushort port, const uint limit) {
     }
 
     int opt=1;
-    if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt))) {
+    #if __linux__
-        throw string("[ERROR] Unable to set REUSEADDR or REUSEPORT on socket ");
+        if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt))) {
-    }
+            throw string("[ERROR] Unable to set REUSEADDR or REUSEPORT on socket ");
+        }
+    #elif _WIN32
+        if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (const char*)&opt, sizeof(opt))) {
+            throw string("[ERROR] Unable to set REUSEADDR or REUSEPORT on socket ");
+        }
+    #endif
+    
 
     if (bind(sock, (struct sockaddr *)&addr, sizeof(struct sockaddr_in)) < 0) {
         throw string("[ERROR] Unable to bind socket ");
     }
 
-    if (listen(sock, limit) < 0) {
+    if (listen(sock, queue) < 0) {
         throw string("[ERROR] It is not possible to set the allowed number of waiting clients ");
     }
 
 }
 
+/**
+ * Metoda za sinkroni rad s klijentima, prima pokazivač na funkciju i timeout;
+ * Funkcija handlecli prima referencu tipa client - važno za definiranje funkcija koje se šalju;
+ * Nije moguće proslijediti druge parametre;
+*/
+
+void server::sync(void (*handlecli)(client&), const uint timeout) {
+    do {
+        client cli(this, timeout, securefds);
+        handlecli(cli);
+    } while (true);
+}
+
+/**
+ * Metoda za asinkdorni rad s klijentima, prima limit, pokazivač na funkciju i timeout;
+ * Funkcija handlecli prima referencu tipa client - važno za definiranje funkcija koje se šalju;
+ * Nije moguće proslijediti druge parametre;
+*/
+
+void server::async(const uint limit, void (*handlecli)(client&), const uint timeout) {
+    for (uint i=0; i<limit; i++) {
+        thr.push_back(thread([&](){
+            client *cli = new client(this, timeout, securefds);
+            while (true) {
+                try {
+                    handlecli(*cli);
+                } catch (const ConnectionException err) {
+                    if (err.isInterrupted()) {
+                        cli->~client();
+                        cli = new client(this, timeout, securefds);
+                    }                    
+                }
+            }
+        }));
+    }
+
+    for (uint i=0; i<limit; i++) {
+        thr[i].join();
+    }
+}
+
+
 /**
  * Destruktor varijable tipa server
 */
@@ -42,10 +98,21 @@ server::~server () {
         throw string("[ERROR] The socket is already closed "); 
     }
 
-    else if (close(sock) != 0) {
+    else {
-        throw string("[ERROR] Unable to close socket ");
+
-    }
+        #if __linux__
+            if (close(sock) != 0) {
+                throw string("[ERROR] Unable to close socket ");
+            }
+        #elif _WIN32
+            if (closesocket(sock) != 0) {
+                throw string("[ERROR] Unable to close socket ");
+            }
+            WSACleanup();
+        #endif
 
+
+    }
 }
 
 /**
@@ -109,9 +176,16 @@ secure::~secure () {
 */
 
 client::client(const string address, const ushort port, const uint timeout, SSL_CTX* securefds) {
+    _timeout = timeout;
 
-    sock = socket(AF_INET, SOCK_STREAM, 0);
+    #if _WIN32
-	if (sock < 0) {
+        if (WSAStartup(MAKEWORD(2,2),&wsa) != 0) {
+            throw string("[ERROR] Unable to set WinSock " + to_string(WSAGetLastError()));
+        }
+    #endif
+
+    conn = socket(AF_INET, SOCK_STREAM, 0);
+	if (conn < 0) {
         throw string("[ERROR] Unable to open TCP socket ");
 	}
 
@@ -121,24 +195,31 @@ client::client(const string address, const ushort port, const uint timeout, SSL_
 	addr.sin_addr.s_addr = inet_addr(_address.c_str());
 	addr.sin_port = htons(port);
 
-    if (connect(sock, (struct sockaddr*)&addr, sizeof(struct sockaddr_in)) != 0) {
+    if (connect(conn, (struct sockaddr*)&addr, sizeof(struct sockaddr_in)) != 0) {
         throw string("Unable to connect to server ");
     }
 
-    struct timeval tv;
+    #if __linux__
-    tv.tv_sec = timeout/1000;
+        struct timeval tv;
-    tv.tv_usec = (timeout%1000)*1000;
+        tv.tv_sec = 0;
+        tv.tv_usec = SOCKET_TIMEOUT;
 
-    if (setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(struct timeval))) {
+        if (setsockopt(conn, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(struct timeval))) {
-        throw string("[ERROR] Unable to set timeout ");
+            throw string("[ERROR] Unable to set timeout ");
-    }
+        }
+    #elif _WIN32
+        DWORD tv = timeout;
+        if (setsockopt(conn, SOL_SOCKET, SO_RCVTIMEO, (const char*)&tv, sizeof(tv))) {
+            throw string("[ERROR] Unable to set timeout ");
+        }
+    #endif
 
     if (securefds) {
         ssl = SSL_new(securefds);
         if (!ssl) {
             throw string("[ERROR] Creating SSL object ");
         }
-        SSL_set_fd(ssl, sock);
+        SSL_set_fd(ssl, conn);
 
         // Perform the SSL handshake
         if (SSL_connect(ssl) <= 0) {
@@ -150,65 +231,6 @@ client::client(const string address, const ushort port, const uint timeout, SSL_
 
 }
 
-
-/**
- * Destruktor varijable tipa client
-*/
-
-client::~client () {
-
-    if (ssl) {
-        SSL_shutdown(ssl);
-        SSL_free(ssl);
-    }
-
-    if (sock <= 0) {
-        throw string("[ERROR] The socket is already closed "); 
-    }
-
-    else if (close(sock) != 0) {
-        throw string("[ERROR] Unable to close socket ");
-    }
-
-}
-
-/**
- * Metoda klase client za slanje podataka preko soketa
- * Prima string koji će biti poslan
- * Vraća logički statu poređenja psolanih karaktera i karaktera u stringu
-*/
-
-
-bool client::tell (const string msg) {
-    size_t sended = 0;
-    if (ssl) {
-       sended = SSL_write(ssl, msg.c_str(), msg.length());
-    }
-    else {
-        sended = write(sock, msg.c_str(), msg.length());
-    }
-    return sended == msg.length();
-}
-
-/**
- * Metoda klase client za primanje poruke preko soketa
- * Prima dozvoljeni broj karaktera koji će primiti
- * Vraća string primljene poruke
-*/
-
-string client::obey (size_t byte_limit) {
-   char res[byte_limit] = {0};
-
-    if (ssl) {
-        SSL_read(ssl, res, byte_limit);
-    }
-    else {
-        read(sock , res, byte_limit);
-    }
-
-    return string(res);
-}
-
 /**
  * Konstruktor varijable tipa commint
  * Prima pokazivač na inicijaliziranu varijablu tipa, port, 
@@ -217,22 +239,30 @@ string client::obey (size_t byte_limit) {
 */
 
 
-comming::comming(const server *_srv, const uint timeout, SSL_CTX* securefds) {
+client::client(const server *_srv, const uint timeout, SSL_CTX* securefds) {
     srv = _srv;
     socklen_t len = sizeof(struct sockaddr_in);
+    _timeout = timeout;
 
     if ((conn = accept(srv->sock, (struct sockaddr *)&(srv->addr), (socklen_t*)&len)) < 0) {
         throw string("[ERROR] Unable to accept client connection ");
     }
 
-    struct timeval tv;
+    #if __linux__
-    tv.tv_sec = timeout/1000;
+        struct timeval tv;
-    tv.tv_usec = (timeout%1000)*1000;
+        tv.tv_sec = 0;
+        tv.tv_usec = SOCKET_TIMEOUT;
 
-    if (setsockopt(conn, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(struct timeval))) {
+        if (setsockopt(conn, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(struct timeval))) {
-        throw string("[ERROR] Unable to set timeout ");
+            throw string("[ERROR] Unable to set timeout ");
-    }
+        }
+    #elif _WIN32
+        DWORD tv = timeout;
 
+        if (setsockopt(conn, SOL_SOCKET, SO_RCVTIMEO, (const char*)&tv, sizeof(tv))) {
+            throw string("[ERROR] Unable to set timeout ");
+        }
+    #endif
 
     if (securefds) {
         ssl = SSL_new(securefds);
@@ -259,11 +289,12 @@ comming::comming(const server *_srv, const uint timeout, SSL_CTX* securefds) {
 
 }
 
+
 /**
- * Destruktor varijable tipa comming
+ * Destruktor varijable tipa client
 */
 
-comming::~comming() {
+client::~client () {
 
     if (ssl) {
         SSL_shutdown(ssl);
@@ -274,43 +305,105 @@ comming::~comming() {
         throw string("[ERROR] The socket is already closed "); 
     }
 
-    else if (close(conn) != 0) {
+    else {
-        throw string("[ERROR] Unable to close socket ");
+        #if __linux__
+            if (close(conn) != 0) {
+                throw string("[ERROR] Unable to close socket ");
+            }
+        #elif _WIN32
+            if (closesocket(conn) != 0) {
+                throw string("[ERROR] Unable to close socket ");
+            }
+            //WSACleanup();
+        #endif
     }
+
 }
 
 /**
- * Metoda klase comming za slanje podataka preko soketa
+ * Metoda klase client za slanje podataka preko soketa
  * Prima string koji će biti poslan
  * Vraća logički statu poređenja psolanih karaktera i karaktera u stringu
 */
 
-bool comming::tell (const string msg) {
+
-    ssize_t sended = 0;
+bool client::push(const string msg) {
-    if (ssl) {
+    size_t total_sent = 0;
-       sended = SSL_write(ssl, msg.c_str(), msg.length());
+    size_t msg_length = msg.length();
-    }
+
-    else {
+    while (total_sent < msg_length) {
-        sended = write(conn, msg.c_str(), msg.length());
+        size_t sent = 0;
+
+        if (ssl) {
+            sent = SSL_write(ssl, msg.c_str() + total_sent, msg_length - total_sent);
+        } else {
+            sent = send(conn, msg.c_str() + total_sent, msg_length - total_sent, 0);
+        }
+
+        if (sent == -1) {
+            throw string("[ERRNO] (push) - Error code: " + to_string(errno) + " Detail: " + strerror(errno));
+        }
+
+        total_sent += sent;
     }
-    return sended == msg.length();
-}
 
+    return true;
+}
 
 /**
- * Metoda klase comming za primanje poruke preko soketa
+ * Metoda klase client za primanje poruke preko soketa
  * Prima dozvoljeni broj karaktera koji će primiti
  * Vraća string primljene poruke
+ * 
+ * Funkcija baca izuzetke koji se moraju uhvatiti za pravilno rukovođenje vezom
+ * Potrebno je i baciti dalje taj izuzetak ukoliko se koriste server async metode
+ * PRILOG
+ * ----------------------------------------------------------------
+ *          try {
+                fromclient = cli.pull();
+            }
+            catch(const ConnectionException except) {
+                if (except.isInterrupted()) {
+                    throw except;
+                }
+                else {
+                    cout << "[EXCEPT] " << except.what() << endl;
+                    fromclient = except.getData();
+                }
+            } 
+ * -----------------------------------------------------------------
+ * 
 */
 
-string comming::obey (size_t byte_limit) {
+string client::pull(size_t byte_limit) {
     char res[byte_limit] = {0};
+    size_t total_received = 0;
+    auto start = high_resolution_clock::now();
 
-    if (ssl) {
+    while (total_received < byte_limit) {
-        SSL_read(ssl, res, byte_limit);
+        ssize_t received = 0;
-    }
+
-    else {
+        if (ssl) {
-        read(conn , res, byte_limit);
+            received = SSL_read(ssl, res + total_received, byte_limit - total_received);
+        } else {
+            received = recv(conn, res + total_received, byte_limit - total_received, 0);
+        }
+
+        cout << "Primljeno " << received << endl;
+
+        if (received == -1) {
+            throw ConnectionException(strerror(errno), string(res, total_received));
+        } else if (received == 0) {
+            throw ConnectionException("The socket is broken", string(res), true);
+        }
+
+        total_received += received;
+
+        auto cycle = high_resolution_clock::now();
+        if (duration_cast<milliseconds>(cycle - start).count() > _timeout) {
+            cout << "TIMEOUT" << endl;
+            throw ConnectionException("Timeout", string(res));
+        }
     }
 
     return string(res);

test/client.cpp

@@ -1,28 +1,79 @@
 #include <iostream>
+#include <string>
+#include <chrono>
 
 #include "../lib/tcp_socket.hpp"
 
 using namespace std;
+using namespace chrono;
 
 int main() {
 
     try {
 
-        secure crypto;
+        // uint n = 10000;
-        cout << "init cert " << endl;
 
-        client myserver("127.0.0.1", 5000, 5000, crypto.fds);
+        // vector<thread> thr;
+        // for (uint i=0; i<n; i++) {
+        //     thr.push_back(thread([](uint a){
+        //         client myserver("127.0.0.1", 5000, 500);
+        //         string sends = "Hello world " + to_string(a);
+        //         myserver.push(sends);
+        //         cout << myserver.pull() << endl;                
+        //     }, i));
+        // }
+
+        // for (uint i=0; i<n; i++) {
+        //     thr[i].join();
+        // } 
+
+        // secure crypto;
+        // cout << "init cert " << endl;
+
+        // client myserver("127.0.0.1", 5000, 5000, crypto.fds);
+        // client myserver("localhost", 8000, 5000, crypto.fds);
         // client myserver("localhost", 5000);
-        cout << "init client " << endl;
+        // cout << "init client " << endl;
+
+
+        // string sends = "Hello world!";
+        // cout << myserver.push(sends) << " " << sends.length() << endl;
+        // cout << "wait client " << endl;
+
+        // cout << myserver.pull();
+
+auto t1 = high_resolution_clock::now();
+            client mycli("127.0.0.1", 5000);
+            auto t2 = high_resolution_clock::now();
+            cout << "Connecting : " << duration_cast<microseconds>(t2 - t1).count() << endl;
+
+
 
+        while (true) {
 
-        string sends = "Hello world!";
-        cout << myserver.tell(sends) << " " << sends.length() << endl;
-        cout << "wait client " << endl;
 
-        cout << myserver.obey();
+            
+            
+            auto t3 = high_resolution_clock::now();
+            mycli.push("Helooo");
+            auto t4 = high_resolution_clock::now();
+            cout << "Send : " << duration_cast<microseconds>(t4 - t3).count() << endl;
+            auto t5 = high_resolution_clock::now();
+            string msg;
+            try {
+                msg = mycli.pull();
+            } catch (const ConnectionException err) {
+                cout << err.what() << endl;
+                msg = err.getData();
+            }
+            cout << msg << endl;
+            auto t6 = high_resolution_clock::now();
+            cout << "Recive : " << duration_cast<microseconds>(t6 - t5).count() << endl;
+            // break;
+        }
 
     }
+    
     catch (const string err) {
         cout << err << endl;
     }

test/compile-client.ps1

@@ -0,0 +1 @@
+g++ client.cpp ../src/* -o client.exe -lssl -lcrypto -lws2_32

test/compile-server.ps1

@@ -0,0 +1 @@
+g++ server.cpp ../src/* -o server.exe -lssl -lcrypto -lws2_32

test/server.cpp

@@ -1,26 +1,45 @@
 #include <iostream>
+#include <chrono>
+
 
 #include "../lib/tcp_socket.hpp"
 
 using namespace std;
+using namespace chrono;
+
 
 int main() {
     try{
-        cout << "init server " << endl;
+        // cout << "init cert " << endl;
-        server myserver(5000);
+        // secure crypto ("../example/cert.pem", "../example/privkey.pem");
-        cout << "init cert " << endl;
+        // cout << "init server " << endl;
-        secure crypto ("../example/cert.pem", "../example/privkey.pem");
+        // server myserver(5000, 100, crypto.fds);
-        cout << "init client " << endl;
+        // cout << "init cert " << endl;
+        // secure crypto ("../example/cert.pem", "../example/privkey.pem");
+        // cout << "init server " << endl;
+        // server myserver(8000, 100, crypto.fds);
+        
+        // cout << "init client " << endl;
 
-        comming myclient(&myserver, 100, crypto.fds);
+        // // client myclient(&myserver, 100, crypto.fds);
-        // comming myclient(&myserver, 100);
+        // // comming myclient(&myserver, 100);
-        cout << "wait client " << myclient.ipv4 << endl;
+        // myserver.accept();
+        // // cout << "wait client " << myclient.ipv4 << endl;
+        // cout << "wait client " << myserver.cli->ipv4 << endl;
 
-        string fromclient =  myclient.obey();
+        // string fromclient =  myserver.cli->pull();
-        cout << "tell client " << fromclient << endl;
+        // // string fromclient =  myclient.pull();
+        // cout << "tell client " << fromclient << endl;
+        // // usleep(600*1000);
+        // sleep(5);
+        // myserver.cli->push(fromclient);
+        // string fromclient =  myserver.cli->pull();
+        // string fromclient =  myclient.pull();
+        // cout << "tell client " << fromclient << endl;
         // usleep(600*1000);
-        sleep(5);
+        //sleep(5);
-        myclient.tell(fromclient);
+        // myserver.cli->push(fromclient);
+        // myclient.push(fromclient);
         // myclient.~comming();
 
         // while (true) {
@@ -33,6 +52,46 @@ int main() {
         // }
 
         // sleep(80);
+
+        cout << "init server " << endl;
+        server myserver(5000, 100);
+        cout << "init client " << endl;
+        myserver.async(8, [](client &cli) {
+            auto t3 = high_resolution_clock::now();
+            string fromclient;
+            try {
+                fromclient = cli.pull();
+            }
+            catch(const ConnectionException except) {
+                if (except.isInterrupted()) {
+                    throw except;
+                }
+                else {
+                    cout << "[EXCEPT] " << except.what() << endl;
+                    fromclient = except.getData();
+                }
+            } 
+            auto t4 = high_resolution_clock::now();
+            cout << "Recive : " << duration_cast<microseconds>(t4 - t3).count() << endl;
+            
+            cout << "> " << fromclient << endl;
+            auto t5 = high_resolution_clock::now();
+            cli.push(fromclient);
+             auto t6 = high_resolution_clock::now();
+            cout << "Response : " << duration_cast<microseconds>(t6 - t5).count() << endl;
+
+        });
+
+        // string teststr = " Idemooo";
+
+        // myserver.sync([](client &cli) {
+        //     cout << "Klijent " << cli.ipv4 << endl;
+        //     string fromclient = cli.pull();
+        //     cout << "S klijenta " << fromclient << endl;
+        //     // fromclient += teststr;
+        //     cli.push(fromclient);
+        // });
+
     }
     catch(const string err) {
         cout << err << endl;