Refactor WebsocketReader into a separate file

src/main.cpp

@@ -15,8 +15,7 @@
  * along with duckticker.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <boost/beast.hpp>
-#include <boost/asio.hpp>
+#include "websocket_reader.hpp"
 #include <simdjson.h>
 #include <wrenpp/vm_fun.hpp>
 #include <wrenpp/def_configuration.hpp>
@@ -54,58 +53,6 @@ class App {
 var the_app = App.new("USD", "kraken")
 )script";
 
-class WebsocketReader {
-	using tcp = boost::asio::ip::tcp;
-public:
-	WebsocketReader (std::string host,
-		const std::string& port,
-		const std::string& path,
-		const std::string& user_agent,
-		const std::string& message
-	);
-
-	~WebsocketReader();
-
-	std::string read();
-
-private:
-	boost::asio::io_context m_ioc;
-	tcp::resolver m_resolver;
-	boost::beast::websocket::stream<tcp::socket> m_ws;
-};
-
-WebsocketReader::WebsocketReader (std::string host,
-		const std::string& port,
-		const std::string& path,
-		const std::string& user_agent,
-		const std::string& message
-) :
-	m_resolver{m_ioc},
-	m_ws{m_ioc}
-{
-	//see https://www.boost.org/doc/libs/develop/libs/beast/example/websocket/client/sync/websocket_client_sync.cpp
-	const auto results = m_resolver.resolve(host, port);
-	auto ep = boost::asio::connect(m_ws.next_layer(), results);
-	host += ':' + std::to_string(ep.port());
-	m_ws.set_option(boost::beast::websocket::stream_base::decorator(
-		[user_agent](boost::beast::websocket::request_type& req)
-		{
-			req.set(boost::beast::http::field::user_agent, user_agent);
-		}
-	));
-	m_ws.handshake(host, path);
-	m_ws.write(boost::asio::buffer(message));
-}
-
-std::string WebsocketReader::read() {
-	boost::beast::flat_buffer buffer;
-	m_ws.read(buffer);
-	return boost::beast::buffers_to_string(buffer.data());
-}
-
-WebsocketReader::~WebsocketReader() {
-	m_ws.close(boost::beast::websocket::close_code::normal);
-}
 
 class TickerPrice {
 public:
@@ -133,10 +80,10 @@ private:
 TickerPrice ticker_price_bitoinity (std::string_view currency, std::string_view exchange) {
 	static const TickerPrice error_price {0.0, "", ""};
 
-	WebsocketReader websocket{"bitcoinity.org",
+	duck::WebsocketReader websocket{"bitcoinity.org",
 		"80",
 		"/webs_bridge/websocket",
-		std::string(BOOST_BEAST_VERSION_STRING) + " websocket-client-coro",
+		std::string{duck::WebsocketReader::BeastVersionString} + " websocket-client-coro",
 		R"({"topic":"webs:markets_)" + std::string{exchange} + "_" +
 			std::string{currency} + R"(","event":"phx_join","payload":{},"ref":"3"})"
 	};

src/meson.build

@@ -23,6 +23,7 @@ executable(meson.project_name(),
   'nap/http_header_parse.cpp',
   'nap/page_fetch.cpp',
   'nap/quick_rest.cpp',
+  'websocket_reader.cpp',
   install: true,
   dependencies: [
     curlcpp_dep,

src/websocket_reader.cpp

@@ -0,0 +1,69 @@
+/* Copyright 2022, Michele Santullo
+ * This file is part of duckticker.
+ *
+ * Wrenpp is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Wrenpp is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with duckticker.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "websocket_reader.hpp"
+#include <boost/beast.hpp>
+#include <boost/asio.hpp>
+
+namespace duck {
+const std::string_view WebsocketReader::BeastVersionString = BOOST_BEAST_VERSION_STRING;
+
+struct WebsocketReader::LocalData {
+	using tcp = boost::asio::ip::tcp;
+
+	LocalData() :
+		resolver{ioc},
+		ws{ioc}
+	{ }
+
+	boost::asio::io_context ioc;
+	tcp::resolver resolver;
+	boost::beast::websocket::stream<tcp::socket> ws;
+};
+
+WebsocketReader::WebsocketReader (std::string host,
+		const std::string& port,
+		const std::string& path,
+		const std::string& user_agent,
+		const std::string& message
+) :
+	m_local(std::make_unique<LocalData>())
+{
+	//see https://www.boost.org/doc/libs/develop/libs/beast/example/websocket/client/sync/websocket_client_sync.cpp
+	const auto results = m_local->resolver.resolve(host, port);
+	auto ep = boost::asio::connect(m_local->ws.next_layer(), results);
+	host += ':' + std::to_string(ep.port());
+	m_local->ws.set_option(boost::beast::websocket::stream_base::decorator(
+		[user_agent](boost::beast::websocket::request_type& req)
+		{
+			req.set(boost::beast::http::field::user_agent, user_agent);
+		}
+	));
+	m_local->ws.handshake(host, path);
+	m_local->ws.write(boost::asio::buffer(message));
+}
+
+std::string WebsocketReader::read() {
+	boost::beast::flat_buffer buffer;
+	m_local->ws.read(buffer);
+	return boost::beast::buffers_to_string(buffer.data());
+}
+
+WebsocketReader::~WebsocketReader() {
+	m_local->ws.close(boost::beast::websocket::close_code::normal);
+}
+} //namespace duck

src/websocket_reader.hpp

@@ -0,0 +1,45 @@
+/* Copyright 2022, Michele Santullo
+ * This file is part of duckticker.
+ *
+ * Wrenpp is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Wrenpp is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with duckticker.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <string>
+#include <string_view>
+#include <memory>
+
+namespace duck {
+class WebsocketReader {
+public:
+	static const std::string_view BeastVersionString;
+
+	WebsocketReader (std::string host,
+		const std::string& port,
+		const std::string& path,
+		const std::string& user_agent,
+		const std::string& message
+	);
+
+	~WebsocketReader();
+
+	std::string read();
+
+private:
+	struct LocalData;
+	std::unique_ptr<LocalData> m_local;
+};
+
+} //namespace duck