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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.hpp>
#include <boost/locale/generator.hpp>
#include <expat.h>
module routemon:srv$impl;
import std;
import :gpx;
import :srv;
namespace beast = boost::beast;
namespace json = boost::json;
namespace net = boost::asio;
using tcp = boost::asio::ip::tcp;
namespace routemon::srv {
class gpx_parse_error_category_impl : public std::error_category
{
public:
char const* name() const noexcept override { return "gpx_parse"; }
auto message(int condition) const noexcept -> std::string override
{
std::ignore = condition;
return "failed to parse GPX file";
}
};
auto gpx_parse_error_category() noexcept -> gpx_parse_error_category_impl const&
{
static auto const inst = gpx_parse_error_category_impl{};
return inst;
}
auto gpx_parse_error() noexcept -> std::error_code
{
return std::error_code{1, gpx_parse_error_category()};
}
class gpx_parse_result
{
std::variant<std::exception_ptr, gpx::file> res_;
public:
auto set_exception(std::exception_ptr ex) noexcept { res_ = ex; }
auto set_gpx_file(gpx::file&& f) noexcept { res_ = std::move(f); }
auto unwrap() -> gpx::file&&
{
return std::visit(
util::overloaded{
[](std::exception_ptr ex) -> gpx::file&&
{
if (ex)
std::rethrow_exception(ex);
else
throw std::runtime_error{"no GPX file parse result available"};
},
[](gpx::file&& f) -> gpx::file&& { return std::move(f); },
},
std::move(res_));
}
};
struct readable_gpx_body
{
using value_type = gpx_parse_result;
class reader
{
gpx::reader r_;
util::not_null<value_type*> res_;
public:
template <bool isRequest, bhttp::concepts::fields Fields>
explicit reader(bhttp::header<isRequest, Fields>&, value_type& v) : res_{&v}
{
}
// The following methods (which are called by Beast) are marked
// noexcept, since Beast does not ensure that exceptions thrown
// here are appropriately directed to the caller of
// (async_)read(_some), so throwing here might cause the program
// to crash.
auto
init(boost::optional<std::uint64_t> /* n */, beast::error_code& ec) noexcept
-> void
{
try
{
r_.init();
ec = {};
}
catch (std::exception& ex)
{
res_->set_exception(std::current_exception());
ec = gpx_parse_error();
}
}
auto
put(beast::concepts::const_buffer_sequence auto b,
beast::error_code& ec) noexcept -> std::size_t
{
auto total = 0uz;
try
{
for (auto it = net::buffer_sequence_begin(b);
it != net::buffer_sequence_end(b); it++)
{
r_.put(
std::string_view{
static_cast<char const*>(it->data()), it->size()
});
total += it->size();
}
ec = {};
}
catch (std::exception& ex)
{
res_->set_exception(std::current_exception());
ec = gpx_parse_error();
}
return total;
}
auto finish(beast::error_code& ec) noexcept
{
try
{
res_->set_gpx_file(r_.finish());
ec = {};
}
catch (std::exception& ex)
{
res_->set_exception(std::current_exception());
ec = gpx_parse_error();
}
}
};
};
static_assert(bhttp::concepts::body<readable_gpx_body>);
static_assert(bhttp::concepts::body_reader<readable_gpx_body>);
auto handler::handle_process_gpx(l0_ctx ctx, http::readable_request r)
-> net::awaitable<http::presponse>
{
auto gpx_file = gpx::file{};
try
{
auto req =
co_await http::read_request<readable_gpx_body>(ctx, std::move(r));
gpx_file = std::move(req->body().unwrap());
}
catch (std::exception& ex)
{
// TODO: more detailed problem reporting
auto tpl = problem::tpl{
.status = bhttp::status::bad_request,
.title = translate("Failed to parse GPX file"),
.type_uri = "https://routemon.fautchen.eu/problems/gpx-parse-failed",
};
co_return http::problem_rsp(
ctx, tpl.instantiate(), http::keep_alive{false});
}
// TODO: catch handler exceptions and return 500 when raised?
// (keep-alive depends on whether whole request was read)
auto mres = inner_.process_gpx(std::move(gpx_file));
if (!mres)
{
auto tpl = problem::tpl{
.status = bhttp::status::internal_server_error,
.title = translate("Internal server error"),
.type_uri = "https://routemon.fautchen.eu/problems/"
"internal-server-error",
};
co_return http::problem_rsp(ctx, tpl.instantiate(), http::keep_alive{true});
}
auto rsp = http::make_rsp<bhttp::string_body>(
bhttp::status::ok, http::keep_alive{true});
rsp.set(bhttp::field::content_type, "application/json");
rsp.body() = json::serialize(json::value_from(*mres));
rsp.prepare_payload();
co_return rsp;
}
auto handler::handle_sysinfo(l0_ctx ctx, http::readable_request r)
-> net::awaitable<http::presponse>
{
auto req = co_await http::read_request<bhttp::empty_body>(ctx, std::move(r));
auto info = inner_.sysinfo();
auto rsp = http::make_rsp<bhttp::string_body>(
bhttp::status::ok, http::keep_alive{true});
rsp.set(bhttp::field::content_type, "application/json");
rsp.body() = json::serialize(json::value_from(info));
rsp.prepare_payload();
co_return rsp;
}
handler::handler(api::handler&& inner) : inner_{std::move(inner)} {}
auto handler::make_routes() -> http::route_tree<http::routed_ctx<outer_ctx>>
{
auto handler = [this]<class MemFn>(MemFn member)
{ return std::bind_front(member, this); };
return http::dtree<http::routed_ctx<outer_ctx>>{}.named_subtrees({
{"gpx", http::dtree<l0_ctx>{{
.post = handler(&handler::handle_process_gpx),
}}
.no_subtrees()},
{"sysinfo", http::dtree<l0_ctx>{
{
.get = handler(&handler::handle_sysinfo),
}
}.no_subtrees()},
});
}
auto server::make_global_middleware(config::http_server const& cfg)
-> http::middleware_t<http::base_ctx, handler::outer_ctx>
{
return http::middleware_compose<
http::base_ctx, http::trace_id_ctx<http::base_ctx>,
http::trace_id_ctx<http::base_ctx>
>(http::trace_id_middleware<http::base_ctx>,
http::cors_middleware<http::trace_id_ctx<http::base_ctx>>(
cfg.allow_origins));
}
server::server(
log::logger const& l, config::http_server const& cfg,
locale::selector&& lsel, api::handler&& inner)
: handler_{std::move(inner)},
srv_{
l, http::router{
std::move(lsel), make_global_middleware(cfg), handler_.make_routes()
}
}
{
}
auto server::spawn(net::io_context& ioc) -> void { srv_.spawn(ioc); }
} // namespace routemon::srv
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