Refactor source (#1171)

For #51

src/etl/impl/ForwardingSource.hpp

@@ -0,0 +1,62 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of clio: https://github.com/XRPLF/clio
+    Copyright (c) 2024, the clio developers.
+
+    Permission to use, copy, modify, and distribute this software for any
+    purpose with or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL,  DIRECT,  INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#pragma once
+
+#include "util/log/Logger.hpp"
+#include "util/requests/WsConnection.hpp"
+
+#include <boost/asio/spawn.hpp>
+#include <boost/json/object.hpp>
+
+#include <chrono>
+#include <optional>
+#include <string>
+
+namespace etl::impl {
+
+class ForwardingSource {
+    util::Logger log_;
+    util::requests::WsConnectionBuilder connectionBuilder_;
+    static constexpr std::chrono::seconds CONNECTION_TIMEOUT{3};
+
+public:
+    ForwardingSource(
+        std::string ip_,
+        std::string wsPort_,
+        std::chrono::steady_clock::duration connectionTimeout = CONNECTION_TIMEOUT
+    );
+
+    /**
+     * @brief Forward a request to rippled.
+     *
+     * @param request The request to forward
+     * @param clientIp IP of the client forwarding this request if known
+     * @param yield The coroutine context
+     * @return Response wrapped in an optional on success; nullopt otherwise
+     */
+    std::optional<boost::json::object>
+    forwardToRippled(
+        boost::json::object const& request,
+        std::optional<std::string> const& forwardToRippledClientIp,
+        boost::asio::yield_context yield
+    ) const;
+};
+
+}  // namespace etl::impl