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module;
#include <boost/asio/as_tuple.hpp>
#include <boost/asio/awaitable.hpp>
#include <boost/asio/co_spawn.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <boost/beast/core.hpp>
#include <boost/beast/http.hpp>
#include <boost/config.hpp>
#include <boost/json/serialize.hpp>
#include <boost/url.hpp>
module routemon:http.server$impl;
import :http.server;
import :trace;
namespace chrono = std::chrono;
namespace routemon::http {
auto presponse::header() -> bhttp::response_header<bhttp::fields>&
{
return impl_->header();
}
auto presponse::header() const -> bhttp::response_header<bhttp::fields> const&
{
return impl_->header();
}
auto presponse::is_done() const -> bool { return impl_->is_done(); }
auto presponse::prepare(beast::error_code& ec) -> const_buffers_type
{
return impl_->prepare(ec);
}
auto presponse::consume(std::size_t n) -> void { return impl_->consume(n); }
auto presponse::keep_alive() const noexcept -> bool
{
return impl_->keep_alive();
}
keep_alive::keep_alive(bool value) : value{value} {}
auto problem_rsp(
base_ctx const& ctx, problem::details const& problem, keep_alive ka)
-> presponse
{
auto rsp = make_rsp<bhttp::string_body>(problem.status, ka);
rsp.set(bhttp::field::content_type, "application/problem+json");
rsp.body() = json::serialize(json::value_from(problem, ctx.locale));
rsp.prepare_payload();
return presponse{std::move(rsp)};
}
auto make_preflight_rsp(preflight_response res, keep_alive ka)
-> bhttp::response<bhttp::empty_body>
{
auto rsp = make_rsp<bhttp::empty_body>(bhttp::status::no_content, ka);
auto allow_headers_str = res.allow_headers
| std::views::transform(
[](auto const& field) -> std::string_view
{ return bhttp::to_string(field); })
| std::views::join_with(std::string_view{", "})
| std::ranges::to<std::string>();
rsp.set(
bhttp::field::access_control_allow_methods,
res.allow_methods.to_string());
rsp.set(bhttp::field::access_control_allow_headers, allow_headers_str);
rsp.prepare_payload();
return rsp;
}
auto global_options_handler(base_ctx const& ctx, readable_request r)
-> net::awaitable<presponse>
{
// TODO: switch to "small (4KB) discarded" body type, similar to what Go
// does? Same goes for default_options_handler? Not sure.
if (auto res = co_await read_request<bhttp::empty_body>(ctx, std::move(r));
!res)
co_return std::move(res.error());
auto req = r.p->release();
auto rsp = make_rsp<bhttp::empty_body>(
bhttp::status::no_content, keep_alive{req.keep_alive()});
rsp.prepare_payload();
co_return std::move(rsp);
}
auto router::handle_request(trace::id trace_id, readable_request r) const
-> net::awaitable<presponse>
{
return impl_->handle_request(trace_id, r);
}
server::server(log::logger const& l, router&& r)
: l_{l.sub("http_server")}, r_{std::move(r)}
{
}
auto server::do_session(beast::tcp_stream strm) -> net::awaitable<void>
{
auto buf = beast::flat_buffer{};
while (true)
{
auto p0 = bhttp::request_parser<bhttp::empty_body>{};
p0.body_limit(boost::none);
auto [ec, _] =
co_await bhttp::async_read_header(strm, buf, p0, net::as_tuple);
if (ec == bhttp::error::end_of_stream)
break;
else if (ec)
throw boost::system::system_error{ec};
auto trace_id = trace::id{};
auto l = l_.sub("do_session").with("trace_id", trace_id.as_string());
l.debug("Read header, invoking request handler");
auto const before_hdl = chrono::steady_clock::now();
auto http_version = p0.get().version();
auto&& rsp = co_await r_.handle_request(
trace_id, readable_request{
.p = util::not_null{&p0},
.strm = util::not_null{&strm},
.buf = util::not_null{&buf},
});
l.debug(
"Request handler returned after {}, writing response",
chrono::duration<double, std::milli>{
chrono::steady_clock::now() - before_hdl
});
auto before_write_rsp = chrono::steady_clock::now();
rsp.header().version(http_version);
bool keep_alive = rsp.keep_alive();
co_await beast::async_write(strm, std::move(rsp));
l.debug(
"Wrote response in {}", chrono::duration<double, std::milli>{
chrono::steady_clock::now() - before_write_rsp
});
if (!keep_alive)
{
break;
}
}
strm.socket().shutdown(tcp::socket::shutdown_send);
}
auto server::do_listen(tcp::endpoint endpoint) -> net::awaitable<void>
{
auto executor = co_await net::this_coro::executor;
auto acceptor = tcp::acceptor{executor, endpoint};
l_.with("endpoint", endpoint.address().to_string())
.with("port", std::to_string(endpoint.port()))
.info("Serving");
while (true)
{
net::co_spawn(
executor,
do_session(beast::tcp_stream{co_await acceptor.async_accept()}),
[this](std::exception_ptr e)
{
if (e)
{
try
{
std::rethrow_exception(e);
}
catch (std::exception const& e)
{
l_.error("Error in session: {}", e.what());
}
}
});
}
}
auto server::spawn(net::io_context& ioc) -> void
{
auto const addr = net::ip::make_address("0.0.0.0");
auto const endpoint = tcp::endpoint{addr, 8284};
// TODO: make exception handling as nice as in srv.cpp
net::co_spawn(
ioc, do_listen(endpoint),
[this](std::exception_ptr e)
{
if (e)
{
try
{
std::rethrow_exception(e);
}
catch (std::exception const& e)
{
l_.error("Error: {}", e.what());
}
}
});
}
} // namespace routemon::http
|
