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evnsq
is a nonblocking async C++ client library for NSQ. It is based on evpp which is a modern C++ network library.
This library is currently used in production which processes more than 130 billions messages every day.
NSQD
instanceNSQDs
nsqlookupd
#include <evnsq/exp.h>
#include <evnsq/consumer.h>
#include <evpp/event_loop.h>
int OnMessage(const evnsq::Message* msg) {
LOG_INFO << "Received a message, id=" << msg->id << " message=[" << msg->body.ToString() << "]";
return 0;
}
int main(int argc, char* argv[]) {
std::string nsqd_tcp_addr;
std::string lookupd_http_url;
nsqd_tcp_addr = "127.0.0.1:4150";
lookupd_http_url = "http://127.0.0.1:4161/lookup?topic=test";
if (argc == 2) {
if (strncmp(argv[1], "http", 4) == 0) {
lookupd_http_url = argv[1];
} else {
nsqd_tcp_addr = argv[1];
}
}
evpp::EventLoop loop;
evnsq::Consumer client(&loop, "test", "ch1", evnsq::Option());
client.SetMessageCallback(&OnMessage);
if (!lookupd_http_url.empty()) {
client.ConnectToLoopupds(lookupd_http_url);
} else {
client.ConnectToNSQDs(nsqd_tcp_addr);
}
loop.Run();
return 0;
}
#include <evnsq/exp.h>
#include <evnsq/consumer.h>
#include <evnsq/producer.h>
#include <evpp/event_loop.h>
#include <chrono>
#include <thread>
#include <getopt.h>
void Publish(evnsq::Producer* producer) {
static const std::string topic1 = "test1";
static const std::string topic2 = "test2";
static int i = 0;
std::stringstream ss;
ss << "a NSQ message, index=" << i++ << " ";
std::string msg = ss.str();
msg.append(1000, 'x');
producer->Publish(topic1, msg);
//LOG_INFO << "Publish : [" << msg << "]";
std::vector<std::string> messages;
messages.push_back(msg);
messages.push_back(msg);
producer->MultiPublish(topic2, messages);
}
void OnReady(evpp::EventLoop* loop, evnsq::Producer* p) {
loop->RunEvery(evpp::Duration(0.001), std::bind(&Publish, p));
for (int i = 0; i < 20; i++) {
Publish(p);
}
}
int main(int argc, char* argv[]) {
google::InitGoogleLogging(argv[0]);
FLAGS_stderrthreshold=0;
int opt = 0;
int option_index = 0;
const char* optstring = "t:h:";
static struct option long_options[] = {
{ "nsqd_tcp_addr", required_argument, NULL, 't' },
{ "lookupd_http_addr", required_argument, NULL, 'h' },
{ 0, 0, 0, 0 }
};
std::string nsqd_tcp_addr;
std::string lookupd_http_url;
nsqd_tcp_addr = "127.0.0.1:4150";
lookupd_http_url = "http://127.0.0.1:14561/nodes";
while ((opt = getopt_long(argc, argv, optstring, long_options, &option_index)) != -1) {
switch (opt) {
case 't':
nsqd_tcp_addr = optarg;
break;
case 'h':
lookupd_http_url = optarg;
break;
default:
printf("error argument [%s]\n", argv[optind]);
return -1;
}
}
evpp::EventLoop loop;
evnsq::Producer client(&loop, evnsq::Option());
client.SetReadyCallback(std::bind(&OnReady, &loop, &client));
if (!lookupd_http_url.empty()) {
client.ConnectToLoopupds(lookupd_http_url);
} else {
client.ConnectToNSQDs(nsqd_tcp_addr);
}
auto f = [](evpp::EventLoop* l, evnsq::Producer* c) {
std::this_thread::sleep_for(std::chrono::seconds(2));
for (;;) {
if (l->pending_functor_count() > 10000) {
std::this_thread::sleep_for(std::chrono::milliseconds(20));
} else {
Publish(c);
}
}
};
std::thread publish_thread(std::bind(f, &loop, &client));
loop.Run();
return 0;
}
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