Intro

Like libevent, libev, and libuv, libhv provides event-loop with non-blocking IO and timer, but simpler apis and richer protocols.

Features

• cross-platform (Linux, Windows, Mac, Solaris)
• event-loop (IO, timer, idle)
• ENABLE_IPV6
• WITH_OPENSSL
• http client/server (include https http1/x http2 grpc)
• http web service, indexof service, api service (support RESTful API)
• protocols
  • dns
  • ftp
  • smtp
• apps
  • ls
  • ifconfig
  • ping
  • nc
  • nmap
  • nslookup
  • ftp
  • sendmail
  • httpd
  • curl

Getting Started

HTTP

http server

see examples/httpd/httpd.cpp

#include "HttpServer.h"

int http_api_echo(HttpRequest* req, HttpResponse* res) {
    res->body = req->body;
    return 0;
}

int main() {
    HttpService service;
    service.base_url = "/v1/api";
    service.AddApi("/echo", HTTP_POST, http_api_echo);

    http_server_t server;
    server.port = 8080;
    server.service = &service;
    http_server_run(&server);
    return 0;
}

http client

see examples/curl.cpp

#include "http_client.h"

int main(int argc, char* argv[]) {
    HttpRequest req;
    req.method = HTTP_POST;
    req.url = "http://localhost:8080/v1/api/echo";
    req.body = "hello,world!";
    HttpResponse res;
    int ret = http_client_send(&req, &res);
    printf("%s\n", req.Dump(true,true).c_str());
    if (ret != 0) {
        printf("* Failed:%s:%d\n", http_client_strerror(ret), ret);
    }
    else {
        printf("%s\n", res.Dump(true,true).c_str());
    }
    return ret;
}

git clone https://github.com/ithewei/libhv.git
cd libhv
make httpd curl

bin/httpd -h
bin/httpd -d
#bin/httpd -c etc/httpd.conf -s restart -d
ps aux | grep httpd

# http web service
bin/curl -v localhost:8080

# http indexof service
bin/curl -v localhost:8080/downloads/

# http api service
bin/curl -v localhost:8080/v1/api/hello
bin/curl -v localhost:8080/v1/api/echo -d "hello,world!"
bin/curl -v localhost:8080/v1/api/query?page_no=1\&page_size=10
bin/curl -v localhost:8080/v1/api/kv   -H "Content-Type:application/x-www-form-urlencoded" -d 'user=admin&pswd=123456'
bin/curl -v localhost:8080/v1/api/json -H "Content-Type:application/json" -d '{"user":"admin","pswd":"123456"}'
bin/curl -v localhost:8080/v1/api/form -F "user=admin pswd=123456"
bin/curl -v localhost:8080/v1/api/upload -F "file=@LICENSE"

bin/curl -v localhost:8080/v1/api/test -H "Content-Type:application/x-www-form-urlencoded" -d 'bool=1&int=123&float=3.14&string=hello'
bin/curl -v localhost:8080/v1/api/test -H "Content-Type:application/json" -d '{"bool":true,"int":123,"float":3.14,"string":"hello"}'
bin/curl -v localhost:8080/v1/api/test -F 'bool=1 int=123 float=3.14 string=hello'
# RESTful API: /group/:group_name/user/:user_id
bin/curl -v -X DELETE localhost:8080/v1/api/group/test/user/123

# webbench (linux only)
make webbench
bin/webbench -c 2 -t 60 localhost:8080

libhv(port:8080) vs nginx(port:80)

EventLoop

see examples/tcp.c examples/udp.c

// TCP echo server
#include "hloop.h"

void on_close(hio_t* io) {
}

void on_recv(hio_t* io, void* buf, int readbytes) {
    hio_write(io, buf, readbytes);
}

void on_accept(hio_t* io) {
    hio_setcb_close(io, on_close);
    hio_setcb_read(io, on_recv);
    hio_read(io);
}

int main(int argc, char** argv) {
    if (argc < 2) {
        printf("Usage: cmd port\n");
        return -10;
    }
    int port = atoi(argv[1]);

    hloop_t* loop = hloop_new(0);
    hio_t* listenio = create_tcp_server(loop, "0.0.0.0", port, on_accept);
    if (listenio == NULL) {
        return -20;
    }
    hloop_run(loop);
    hloop_free(&loop);
    return 0;
}

make tcp udp nc
bin/tcp 1111
bin/nc 127.0.0.1 1111

bin/udp 2222
bin/nc -u 127.0.0.1 2222

BUILD

lib

• make libhv
• sudo make install

examples

• make examples
  • make test # master-workers model
  • make timer # timer add/del/reset
  • make loop # event-loop(include idle, timer, io)
  • make tcp # tcp server
  • make udp # udp server
  • make nc # network client
  • make nmap # host discovery
  • make httpd # http server
  • make curl # http client

unittest

• make unittest

compile options

compile with print debug info

• make DEFINES=PRINT_DEBUG

compile WITH_OPENSSL

libhv combines OpenSSL perfectly, something almost all asynchronous IO network libraries don't do.
And enable SSL in libhv is so easy, just only two apis:

// init global SSL_CTX, see base/ssl_ctx.h
int ssl_ctx_init(const char* crt_file, const char* key_file, const char* ca_file);

// enable ssl, see event/hloop.h
int hio_enable_ssl(hio_t* io);

https is the best example.

sudo apt-get install openssl libssl-dev # ubuntu
make clean
make libhv httpd curl WITH_OPENSSL=yes
# editor etc/httpd.conf => ssl = on
bin/httpd -d
bin/curl -v https://localhost:8080
curl -v https://localhost:8080 --insecure

compile WITH_CURL

• make WITH_CURL=yes DEFINES="CURL_STATICLIB"

compile WITH_NGHTTP2

sudo apt-get install libnghttp2-dev # ubuntu
make clean
make libhv httpd curl WITH_NGHTTP2=yes
bin/httpd -d
bin/curl -v localhost:8080 --http2

other options

see config.mk

echo-servers

make libhv
make webbench

# ubuntu16.04
sudo apt-get install libevent-dev libev-dev libuv1-dev libboost-dev libasio-dev libpoco-dev
# muduo install => https://github.com/chenshuo/muduo.git
make echo-servers
sudo echo-servers/benchmark.sh

echo-servers/benchmark

Note: The client and servers are located in the same computer, the results are random, for reference only. In general, the performance of these libraries are similar, each has its own advantages.