Program Listing for File http_server.cpp
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/*
* SPDX-FileCopyrightText: Copyright (c) 2023-2024, NVIDIA CORPORATION & AFFILIATES.
* All rights reserved. SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// TODO(dagardner): add /health & /info endpoints
#include "morpheus/utilities/http_server.hpp"
#include "pymrc/utilities/function_wrappers.hpp" // for PyFuncWrapper
#include <boost/asio.hpp> // for dispatch, make_address
#include <boost/asio/any_io_executor.hpp>
#include <boost/asio/basic_socket_acceptor.hpp> // for basic_socket_acceptor<>::executor_type
#include <boost/asio/basic_stream_socket.hpp> // for basic_stream_socket
#include <boost/asio/dispatch.hpp>
#include <boost/asio/ip/tcp.hpp> // for acceptor, endpoint, socket,
#include <boost/asio/socket_base.hpp> // for socket_base::reuse_address, socket_base, socket_base::max_listen_connections
#include <boost/asio/strand.hpp> // for strand, make_strand, operator==
#include <boost/beast/core.hpp> // for bind_front_handler, error_code, flat_buffer, tcp_stream
#include <boost/beast/core/bind_handler.hpp> // for bind_front_handler
#include <boost/beast/core/error.hpp> // for error_code
#include <boost/beast/core/flat_buffer.hpp> // for flat_buffer
#include <boost/beast/core/rate_policy.hpp>
#include <boost/beast/core/tcp_stream.hpp> // for tcp_stream
#include <boost/beast/http.hpp> // for read_async, request, response, verb, write_async
#include <boost/beast/http/error.hpp> // for error, error::end_of_stream
#include <boost/beast/http/field.hpp> // for field, field::content_type
#include <boost/beast/http/fields.hpp>
#include <boost/beast/http/message.hpp> // for message, response, request
#include <boost/beast/http/parser.hpp> // for request_parser, parser
#include <boost/beast/http/status.hpp> // for status, status::not_found
#include <boost/beast/http/string_body.hpp> // for string_body, basic_string_body, basic_string_body<>::value_type
#include <boost/beast/http/verb.hpp> // for verb, operator<<, verb::unknown
#include <boost/core/detail/string_view.hpp>
#include <glog/logging.h> // for CHECK and LOG
#include <pybind11/gil.h>
#include <pybind11/pybind11.h> // IWYU pragma: keep
#include <pybind11/pytypes.h>
#include <exception> // for exception
#include <ostream> // needed for glog
#include <stdexcept> // for runtime_error, length_error
#include <type_traits> // indirectly used by pybind11 casting
#include <utility> // for move
// loosely based on the following examples:
// https://www.boost.org/doc/libs/1_74_0/libs/beast/example/http/server/async/http_server_async.cpp
// https://www.boost.org/doc/libs/1_74_0/libs/beast/example/advanced/server/advanced_server.cpp
namespace {
namespace beast = boost::beast; // from <boost/beast.hpp>
namespace http = beast::http; // from <boost/beast/http.hpp>
namespace net = boost::asio; // from <boost/asio.hpp>
// from <boost/asio/ip/tcp.hpp>
using tcp = boost::asio::ip::tcp; // NOLINT(readability-identifier-naming)
using namespace std::literals::chrono_literals;
class Session : public std::enable_shared_from_this<Session>
{
public:
Session(tcp::socket&& socket,
std::vector<morpheus::HttpEndpoint>& endpoints,
std::size_t max_payload_size,
std::chrono::seconds timeout) :
m_stream{std::move(socket)},
m_endpoints{endpoints},
m_max_payload_size{max_payload_size},
m_timeout{timeout},
m_on_complete_cb{nullptr}
{}
~Session() = default;
void run()
{
net::dispatch(m_stream.get_executor(), beast::bind_front_handler(&Session::do_read, shared_from_this()));
}
private:
void do_read()
{
m_parser = std::make_unique<http::request_parser<http::string_body>>();
m_parser->body_limit(m_max_payload_size);
m_stream.expires_after(m_timeout);
http::async_read(
m_stream, m_buffer, *m_parser, beast::bind_front_handler(&Session::on_read, shared_from_this()));
}
void on_read(beast::error_code ec, std::size_t bytes_transferred)
{
if (ec == http::error::end_of_stream)
{
return do_close();
}
if (ec)
{
LOG(ERROR) << "Error reading request: " << ec.message();
return;
}
// Release ownership of the parsed message and move it into the
// handle_request method
handle_request(m_parser->release());
}
void handle_request(http::request<http::string_body>&& request)
{
DLOG(INFO) << "Received request: " << request.method() << " : " << request.target();
m_response = std::make_unique<http::response<http::string_body>>();
bool valid_request = false;
for (const auto& endpoint : m_endpoints)
{
if (request.target() == endpoint.m_url && request.method() == endpoint.m_method)
{
valid_request = true;
std::string body{request.body()};
auto parse_status = (*endpoint.m_parser)(body);
m_response->result(std::get<0>(parse_status));
m_response->set(http::field::content_type, std::get<1>(parse_status));
m_response->body() = std::get<2>(parse_status);
m_on_complete_cb = std::get<3>(parse_status);
break;
}
}
if (!valid_request)
{
m_response->result(http::status::not_found);
m_response->set(http::field::content_type, "text/plain");
m_response->body() = "not found";
}
try
{
DLOG(INFO) << "Response: " << m_response->result_int();
m_response->keep_alive(request.keep_alive());
m_response->prepare_payload();
http::async_write(
m_stream,
*m_response,
beast::bind_front_handler(&Session::on_write, shared_from_this(), m_response->need_eof()));
} catch (const std::exception& e)
{
LOG(ERROR) << "Caught exception while writing response: " << e.what();
}
}
void on_write(bool close, beast::error_code ec, std::size_t bytes_transferred)
{
if (ec)
{
LOG(ERROR) << "Error writing response: " << ec.message();
}
if (m_on_complete_cb)
{
try
{
m_on_complete_cb(ec);
} catch (const std::exception& e)
{
LOG(ERROR) << "Caught exception while calling on_complete callback: " << e.what();
} catch (...)
{
LOG(ERROR) << "Caught unknown exception while calling on_complete callback";
}
m_on_complete_cb = nullptr;
}
m_parser.reset(nullptr);
m_response.reset(nullptr);
if (close)
{
return do_close();
}
do_read();
}
void do_close()
{
beast::error_code ec;
m_stream.socket().shutdown(tcp::socket::shutdown_send, ec);
}
beast::tcp_stream m_stream;
beast::flat_buffer m_buffer;
std::vector<morpheus::HttpEndpoint> m_endpoints;
std::size_t m_max_payload_size;
std::chrono::seconds m_timeout;
// The response, and parser are all reset for each incoming request
std::unique_ptr<http::request_parser<http::string_body>> m_parser;
std::unique_ptr<http::response<http::string_body>> m_response;
morpheus::on_complete_cb_fn_t m_on_complete_cb;
};
} // namespace
namespace morpheus {
HttpServer::HttpServer(std::vector<HttpEndpoint> endpoints,
std::string bind_address,
unsigned short port,
unsigned short num_threads,
std::size_t max_payload_size,
std::chrono::seconds request_timeout) :
m_endpoints(std::move(endpoints)),
m_bind_address(std::move(bind_address)),
m_port(port),
m_num_threads(num_threads),
m_request_timeout(request_timeout),
m_max_payload_size(max_payload_size),
m_io_context{m_num_threads},
m_is_running{false}
{
if (m_num_threads == 0)
{
throw std::runtime_error("num_threads must be greater than 0");
}
}
void HttpServer::start_listener(std::binary_semaphore& listener_semaphore, std::binary_semaphore& started_semaphore)
{
listener_semaphore.acquire();
DCHECK(m_listener_threads.size() == 1 && m_listener_threads[0].get_id() == std::this_thread::get_id())
<< "start_listener must be called from the first thread in "
"m_listener_threads";
m_listener = std::make_shared<Listener>(
m_io_context, m_bind_address, m_port, m_endpoints, m_max_payload_size, m_request_timeout);
m_listener->run();
for (auto i = 1; i < m_num_threads; ++i)
{
net::io_context& ioc = m_io_context;
m_listener_threads.emplace_back([&ioc]() {
ioc.run();
});
}
m_is_running = true;
started_semaphore.release();
m_io_context.run();
}
void HttpServer::start()
{
CHECK(!is_running()) << "HttpServer is already running";
try
{
DLOG(INFO) << "Starting HttpServer on " << m_bind_address << ":" << m_port << " with " << m_num_threads
<< " threads";
m_listener_threads.reserve(m_num_threads);
std::binary_semaphore listener_semaphore{0};
std::binary_semaphore started_semaphore{0};
m_listener_threads.emplace_back(
&HttpServer::start_listener, this, std::ref(listener_semaphore), std::ref(started_semaphore));
listener_semaphore.release();
started_semaphore.acquire();
} catch (const std::exception& e)
{
LOG(ERROR) << "Caught exception while starting HTTP server: " << e.what();
stop();
}
}
void HttpServer::stop()
{
m_io_context.stop();
while (!m_io_context.stopped())
{
std::this_thread::sleep_for(std::chrono::milliseconds(100));
}
for (auto& t : m_listener_threads)
{
t.join();
}
m_listener_threads.clear();
if (m_listener)
{
// io context stopped, so we can stop the listener
m_listener->stop();
m_listener.reset();
}
m_is_running = false;
}
bool HttpServer::is_running() const
{
return m_is_running;
}
HttpServer::~HttpServer()
{
try
{
if (is_running())
{
stop();
}
} catch (const std::exception& e)
{
LOG(ERROR) << "Caught exception while stopping HTTP server: " << e.what();
}
}
/****** HttpEndpointInterfaceProxy *************************/
using mrc::pymrc::PyFuncWrapper;
namespace py = pybind11;
std::shared_ptr<HttpEndpoint> HttpEndpointInterfaceProxy::init(pybind11::function py_parse_fn,
std::string url,
std::string method)
{
auto wrapped_parse_fn = PyFuncWrapper(std::move(py_parse_fn));
payload_parse_fn_t payload_parse_fn = [wrapped_parse_fn = std::move(wrapped_parse_fn)](const std::string& payload) {
py::gil_scoped_acquire gil;
auto py_payload = py::str(payload);
auto py_result = wrapped_parse_fn.operator()<py::tuple, py::str>(py_payload);
on_complete_cb_fn_t cb_fn{nullptr};
if (!py_result[3].is_none())
{
auto py_cb_fn = py_result[3].cast<py::function>();
auto wrapped_cb_fn = PyFuncWrapper(std::move(py_cb_fn));
cb_fn = [wrapped_cb_fn = std::move(wrapped_cb_fn)](const beast::error_code& ec) {
py::gil_scoped_acquire gil;
py::bool_ has_error = false;
py::str error_msg;
if (ec)
{
has_error = true;
error_msg = ec.message();
}
wrapped_cb_fn.operator()<void, py::bool_, py::str>(has_error, error_msg);
};
}
return std::make_tuple(py::cast<unsigned>(py_result[0]),
py::cast<std::string>(py_result[1]),
py::cast<std::string>(py_result[2]),
std::move(cb_fn));
};
return std::make_shared<HttpEndpoint>(std::move(payload_parse_fn), url, method);
}
/****** HttpServerInterfaceProxy *************************/
std::shared_ptr<HttpServer> HttpServerInterfaceProxy::init(std::vector<HttpEndpoint> endpoints,
std::string bind_address,
unsigned short port,
unsigned short num_threads,
std::size_t max_payload_size,
int64_t request_timeout)
{
return std::make_shared<HttpServer>(std::move(endpoints),
std::move(bind_address),
port,
num_threads,
max_payload_size,
std::chrono::seconds(request_timeout));
}
void HttpServerInterfaceProxy::start(HttpServer& self)
{
pybind11::gil_scoped_release release;
self.start();
}
void HttpServerInterfaceProxy::stop(HttpServer& self)
{
pybind11::gil_scoped_release release;
self.stop();
}
bool HttpServerInterfaceProxy::is_running(const HttpServer& self)
{
pybind11::gil_scoped_release release;
return self.is_running();
}
HttpServer& HttpServerInterfaceProxy::enter(HttpServer& self)
{
self.start();
return self;
}
void HttpServerInterfaceProxy::exit(HttpServer& self,
const pybind11::object& type,
const pybind11::object& value,
const pybind11::object& traceback)
{
pybind11::gil_scoped_release release;
self.stop();
}
HttpEndpoint::HttpEndpoint(payload_parse_fn_t payload_parse_fn, std::string url, std::string method) :
m_parser{std::make_shared<payload_parse_fn_t>(std::move(payload_parse_fn))},
m_url{std::move(url)},
m_method{http::string_to_verb(method)}
{
if (m_method == http::verb::unknown)
{
throw std::runtime_error("Invalid method: " + method);
}
if (m_url.front() != '/')
{
m_url.insert(m_url.begin(), '/');
}
}
Listener::Listener(net::io_context& io_context,
const std::string& bind_address,
unsigned short port,
std::vector<HttpEndpoint> endpoints,
std::size_t max_payload_size,
std::chrono::seconds request_timeout) :
m_io_context{io_context},
m_tcp_endpoint{net::ip::make_address(bind_address), port},
m_acceptor{std::make_unique<tcp::acceptor>(net::make_strand(m_io_context))},
m_endpoints{std::move(endpoints)},
m_max_payload_size{max_payload_size},
m_request_timeout{request_timeout},
m_is_running{false}
{
m_acceptor->open(m_tcp_endpoint.protocol());
m_acceptor->set_option(net::socket_base::reuse_address(true));
m_acceptor->bind(m_tcp_endpoint);
m_acceptor->listen(net::socket_base::max_listen_connections);
}
void Listener::stop()
{
m_acceptor->close();
m_is_running = false;
m_acceptor.reset();
for (auto& endpoint : m_endpoints)
{
endpoint.m_parser.reset();
}
}
void Listener::run()
{
net::dispatch(m_acceptor->get_executor(),
beast::bind_front_handler(&Listener::do_accept, this->shared_from_this()));
m_is_running = true;
}
bool Listener::is_running() const
{
return m_is_running;
}
void Listener::do_accept()
{
m_acceptor->async_accept(net::make_strand(m_io_context),
beast::bind_front_handler(&Listener::on_accept, this->shared_from_this()));
}
void Listener::on_accept(beast::error_code ec, tcp::socket socket)
{
if (ec)
{
LOG(ERROR) << "Error accepting connection: " << ec.message();
}
else
{
std::make_shared<Session>(std::move(socket), m_endpoints, m_max_payload_size, m_request_timeout)->run();
}
do_accept();
}
} // namespace morpheus