I currently learning how to use the lib ZeroMQ that a friend advise me to use for a personnal project.
After reading the documentation and planning how to use the lib for my project, I began testing the project with the code given by the documentation. The test I used was this one . Unfortunatly it doesn't work. I did some minor modification to test it. (I give you the exact code I have on my test, it's a lot I am sorry but without everything I think it doesn't make sense and it's impossible to help me :/ ).
I almost changed nothing from the test given by the documentation, just added some output to test and I also deleted the poll in the client (I thought the probleme came from here because it was blocking the infinite loop even thought there was a timeout).
#include <vector>
#include <thread>
#include <memory>
#include <functional>
#include <zmq.h>
#include <zmq.hpp>
#include <zhelper.hpp>
// This is our client task class.
// It connects to the server, and then sends a request once per second
// It collects responses as they arrive, and it prints them out. We will
// run several client tasks in parallel, each with a different random ID.
// Attention! -- this random work well only on linux.
class client_task {
public:
client_task()
: ctx_(1),
client_socket_(ctx_, ZMQ_DEALER)
{}
void start() {
// generate random identity
char identity[10] = {};
sprintf(identity, "%04X-%04X", within(0x10000), within(0x10000));
printf("-> %s\n", identity);
client_socket_.setsockopt(ZMQ_IDENTITY, identity, strlen(identity));
client_socket_.connect("tcp://localhost:5570");
zmq_pollitem_t items;
items.socket = &client_socket_;
items.fd = 0;
items.events = ZMQ_POLLIN;
items.revents = 0;
int request_nbr = 0;
try {
while (true) {
for (int i = 0; i < 100; ++i) {
// 10 milliseconds
sleep(1);
std::cout << "ici" << std::endl;
if (items.revents & ZMQ_POLLIN) {
printf("\n%s ", identity);
s_dump(client_socket_);
}
char request_string[16] = {};
sprintf(request_string, "request #%d", ++request_nbr);
client_socket_.send(request_string, strlen(request_string));
}
}
}
catch (std::exception &e)
{}
}
private:
zmq::context_t ctx_;
zmq::socket_t client_socket_;
};
// Each worker task works on one request at a time and sends a random number
// of replies back, with random delays between replies:
class server_worker {
public:
server_worker(zmq::context_t &ctx, int sock_type)
: ctx_(ctx),
worker_(ctx_, sock_type)
{}
void work() {
worker_.connect("inproc://backend");
try {
while (true) {
zmq::message_t identity;
zmq::message_t msg;
zmq::message_t copied_id;
zmq::message_t copied_msg;
worker_.recv(&identity);
worker_.recv(&msg);
std::cout << "I never arrive here" << std::endl;
int replies = within(5);
for (int reply = 0; reply < replies; ++reply) {
std::cout << "LA" << std::endl;
s_sleep(within(1000) + 1);
copied_id.copy(&identity);
copied_msg.copy(&msg);
worker_.send(copied_id, ZMQ_SNDMORE);
worker_.send(copied_msg);
}
}
}
catch (std::exception &e) {}
}
private:
zmq::context_t &ctx_;
zmq::socket_t worker_;
};
// This is our server task.
// It uses the multithreaded server model to deal requests out to a pool
// of workers and route replies back to clients. One worker can handle
// one request at a time but one client can talk to multiple workers at
// once.
class server_task {
public:
server_task()
: ctx_(1),
frontend_(ctx_, ZMQ_ROUTER),
backend_(ctx_, ZMQ_DEALER)
{}
void run() {
frontend_.bind("tcp://*:5570");
backend_.bind("inproc://backend");
server_worker * worker = new server_worker(ctx_, ZMQ_DEALER);
std::thread worker_thread(std::bind(&server_worker::work, worker));
worker_thread.detach();
try {
zmq::proxy(&frontend_, &backend_, NULL);
}
catch (std::exception &e) {}
}
private:
zmq::context_t ctx_;
zmq::socket_t frontend_;
zmq::socket_t backend_;
};
// The main thread simply starts several clients and a server, and then
// waits for the server to finish.
int main (void)
{
client_task ct1;
client_task ct2;
client_task ct3;
server_task st;
std::thread t1(std::bind(&client_task::start, &ct1));
std::thread t2(std::bind(&client_task::start, &ct2));
std::thread t3(std::bind(&client_task::start, &ct3));
std::thread t4(std::bind(&server_task::run, &st));
t1.detach();
t2.detach();
t3.detach();
t4.detach();
std::cout << "ok" << std::endl;
getchar();
std::cout << "ok" << std::endl;
return 0;
}
The output I get from this code is the following :
-> CC66-C879
-> 3292-E961
-> C4AA-55D1
ok
ici
ici
ici
... (infinite ici)
I really don't understand why it doesn't work. The poll in the client send an exception Socket operation on non-socket. The major probleme for me is that it's a test coming from the official documentation and I can't make it work. What is the problem about my utilisation of the socket ?
Thanks for your help
