Start tinkering with UDP

source/client/client.cpp

@@ -94,14 +94,18 @@ awaitable<void> simple_client::connect_to_server() noexcept {
 
     net::ip::tcp::socket socket(io_context_);
 
-    logger.debug("Attempting connection with {}", results.begin()->endpoint());
-    auto [ec2] = co_await socket.async_connect(*results.begin(), no_ex_coro);
-    if (ec2) {
-        logger.error("connection to {} failed: {}", results.begin()->endpoint(),
-                ec2);
-        co_return;
+    for (auto const& r : results) {
+        logger.debug("Connecting to {}", r.endpoint());
+        auto [ec] = co_await socket.async_connect(r, no_ex_coro);
+        if (!ec) {
+            logger.error("connection to {} failed: {}",
+                    results.begin()->endpoint(), ec);
+            continue;
+        }
     }
 
+    logger.error("Unable to connect to any resolved endpoints.");
+
     co_return;
 }
 

source/server/BUILD

@@ -1,5 +1,13 @@
 # parselink
 
+cc_library(
+    name = "headers",
+    hdrs = [
+        "//include/parselink:server.h",
+    ],
+    visibility = ["//visibility:public"],
+)
+
 cc_library(
     name = "server",
     srcs = [
@@ -20,11 +28,37 @@ cc_library(
 )
 
 cc_library(
-    name = "headers",
-    hdrs = [
-        "//include/parselink:server.h",
+    name = "udp_server",
+    srcs = [
+        "udp_server.cpp",
+    ],
+    deps = [
+        "headers",
+        "//include/parselink:msgpack",
+        "//include/parselink:proto",
+        "//include/parselink:server",
+        "//include/parselink:utility",
+        "//source/logging",
+        "@hydrogen",
+        "@boost//:asio",
+    ],
+    visibility = [
+        # TODO: Fix visibility
+        "//visibility:public",
+    ],
+)
+
+cc_binary(
+    name = "udp_parselinkd",
+    srcs = [
+        "main.cpp",
+    ],
+    deps = [
+        "//source/logging",
+        "//source/proto",
+        ":udp_server",
+        "@boost//:beast",
     ],
-    visibility = ["//visibility:public"],
 )
 
 cc_binary(

source/server/udp_server.cpp

@@ -0,0 +1,86 @@
+#include "parselink/server.h"
+
+#include "parselink/logging.h"
+#include "parselink/msgpack/core/packer.h"
+#include "parselink/msgpack/core/unpacker.h"
+#include "parselink/proto/parser.h"
+#include "parselink/proto/session.h"
+#include "parselink/utility/file.h"
+
+#include <boost/asio/as_tuple.hpp>
+#include <boost/asio/co_spawn.hpp>
+#include <boost/asio/deferred.hpp>
+#include <boost/asio/detached.hpp>
+#include <boost/asio/io_context.hpp>
+#include <boost/asio/ip/address.hpp>
+#include <boost/asio/ip/udp.hpp>
+#include <boost/asio/signal_set.hpp>
+
+#include <fmt/ranges.h>
+#include <map>
+
+using namespace parselink;
+
+using namespace std::chrono_literals;
+
+namespace net = boost::asio;
+using udp = net::ip::udp;
+
+namespace {
+logging::logger logger{"udp.server"};
+constexpr auto no_ex_coro = net::as_tuple(net::use_awaitable);
+} // namespace
+
+class udp_server : public server {
+public:
+    udp_server(std::string_view address, std::uint16_t port) noexcept;
+
+    std::error_code run() noexcept;
+
+private:
+    net::awaitable<void> listen() noexcept;
+
+    net::io_context io_context_;
+    udp::endpoint local_endpoint_;
+    std::map<udp::endpoint, int> remotes_;
+};
+
+udp_server::udp_server(std::string_view address, std::uint16_t port) noexcept
+        : io_context_{1}
+        , local_endpoint_{
+                  net::ip::address::from_string(std::string{address}), port} {
+    // Load keys, config data from file.
+    logger.debug("Creating server.");
+}
+
+net::awaitable<void> udp_server::listen() noexcept {
+    auto exec = co_await net::this_coro::executor;
+    logger.debug("Binding listener socket to {}.", local_endpoint_);
+    udp::socket listener{exec, local_endpoint_};
+
+    while (true) {
+        udp::endpoint remote;
+        std::array<std::byte, 4096> buff;
+        auto [ec, br] = co_await listener.async_receive_from(
+                net::buffer(buff), remote, no_ex_coro);
+        if (!ec) {
+            logger.debug("From {}: {}", remote, std::span(buff.begin(), br));
+        }
+    }
+
+    co_return;
+}
+
+std::error_code udp_server::run() noexcept {
+    co_spawn(io_context_, listen(), net::detached);
+
+    io_context_.run();
+
+    return {};
+}
+
+std::unique_ptr<server> parselink::make_server(
+        std::string_view address, std::uint16_t user_port, std::uint16_t) {
+    using impl = udp_server;
+    return std::make_unique<impl>(address, user_port);
+}