nghttp2/examples/asio-sv3.cc

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/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2014 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
// We wrote this code based on the original code which has the
// following license:
//
// main.cpp
// ~~~~~~~~
//
// Copyright (c) 2003-2013 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include <unistd.h>
#include <iostream>
#include <string>
#include <deque>
#include <nghttp2/asio_http2.h>
using namespace nghttp2::asio_http2;
using namespace nghttp2::asio_http2::server;
int main(int argc, char* argv[])
{
try {
// Check command line arguments.
if (argc < 4) {
std::cerr << "Usage: asio-sv3 <port> <threads> <tasks> "
<< " <private-key-file> <cert-file>\n";
return 1;
}
uint16_t port = std::stoi(argv[1]);
std::size_t num_threads = std::stoi(argv[2]);
std::size_t num_concurrent_tasks = std::stoi(argv[3]);
http2 server;
server.num_threads(num_threads);
if(argc >= 5) {
server.tls(argv[4], argv[5]);
}
server.num_concurrent_tasks(num_concurrent_tasks);
server.listen
("*", port,
[](std::shared_ptr<request> req, std::shared_ptr<response> res)
{
res->write_head(200);
auto msgq = std::make_shared<std::deque<std::string>>();
res->end
([msgq](uint8_t *buf, std::size_t len) -> std::pair<ssize_t, bool>
{
if(msgq->empty()) {
// if msgq is empty, tells the library that don't call
// this callback until we call res->resume(). This is
// done by returing std::make_pair(0, false).
return std::make_pair(0, false);
}
auto msg = std::move(msgq->front());
msgq->pop_front();
if(msg.empty()) {
// The empty message signals the end of response in
// this simple protocol.
return std::make_pair(0, true);
}
auto nwrite = std::min(len, msg.size());
std::copy(std::begin(msg), std::begin(msg) + nwrite, buf);
if(msg.size() > nwrite) {
msgq->push_front(msg.substr(nwrite));
}
return std::make_pair(nwrite, false);
});
req->run_task
([res, msgq](channel& channel)
{
// executed in different thread from request callback
// was called.
// Using res and msgq is not safe inside this callback.
// But using them in callback passed to channel::post is
// safe.
// We just emit simple message "message N\n" in every 1
// second and 3 times in total.
for(std::size_t i = 0; i < 3; ++i) {
msgq->push_back("message " + std::to_string(i + 1) + "\n");
channel.post([res]()
{
// executed in same thread where
// request callback was called.
// Tells library we have new message.
res->resume();
});
sleep(1);
}
// Send empty message to signal the end of response
// body.
msgq->push_back("");
channel.post([res]()
{
// executed in same thread where request
// callback was called.
res->resume();
});
});
});
} catch (std::exception& e) {
std::cerr << "exception: " << e.what() << "\n";
}
return 0;
}