week10: simplify SyncJuliaClient

week10/exercise_solutions/w10_solution_01_SyncJuliaClient/SyncJuliaClient.cpp

@@ -9,71 +9,46 @@
 #include <iterator>
 #include <sstream>
 
-int main() {
+int main()
+try {
 	auto context = asio::io_context { };
 
-	auto error = asio::error_code { };
-
-	auto resolver = asio::ip::tcp::resolver { context };
-	auto resolved = resolver.resolve("127.0.0.1", "8080", error);
-
-	if (error) {
-		std::cerr << "Failed to resolve server address: " << error.message() << '\n';
-		return EXIT_FAILURE;
-	}
-
+	auto server_address = asio::ip::make_address("127.0.0.1");
+	auto server_endpoint = asio::ip::tcp::endpoint { server_address, 8080 };
 	auto socket = asio::ip::tcp::socket { context };
-	asio::connect(socket, resolved, error);
-
-	if (error) {
-		std::cerr << "Failed to connect to server: " << error.message() << '\n';
-		return EXIT_FAILURE;
-	}
+	socket.connect(server_endpoint);
 
 	auto request = std::ostringstream { };
 	request << http::request { http::method::get };
 	auto request_data = request.str();
 
-	asio::write(socket, asio::buffer(request_data), error);
-
-	if (error) {
-		std::cerr << "Failed to send request: " << error.message() << '\n';
-		return EXIT_FAILURE;
-	}
+	asio::write(socket, asio::buffer(request_data));
 
 	auto response_buffer = asio::streambuf { };
 	auto response_stream = std::istream { &response_buffer };
-	asio::read_until(socket, response_buffer, "\r\n\r\n", error);
-
-	if (error) {
-		std::cerr << "Failed to read response headers: " << error.message() << '\n';
-		return EXIT_FAILURE;
-	}
+	asio::read_until(socket, response_buffer, "\r\n\r\n");
 
 	auto response = http::response { response_stream };
 
 	if (!response.complete()) {
 		auto content_length = response.get<http::header::content_length>();
 		auto buffered = response_buffer.size();
-		asio::read(socket, response_buffer, asio::transfer_exactly(content_length - buffered), error);
-
-		if (error) {
-			std::cerr << "Failed to read response body: " << error.message() << '\n';
-			return EXIT_FAILURE;
-		}
-
+		asio::read(socket, response_buffer, asio::transfer_exactly(content_length - buffered));
 		response.body(response_stream);
 	}
 
-	if(response.status() != http::status_code::ok) {
+	if (response.status() != http::status_code::ok) {
 		std::cerr << "Server did not accept the request: " << to_string(response.status()) << '\n';
 		return EXIT_FAILURE;
 	}
 
 	auto file = std::ofstream { "julia.bmp", std::ios::trunc | std::ios::binary };
 	auto image_data = response.body();
-	copy(cbegin(image_data), cend(image_data), std::ostream_iterator<char> { file, "" });
+	copy(cbegin(image_data), cend(image_data), std::ostream_iterator<char> { file });
 	file.close();
 
 	std::cout << "Successfully received Julia fractal from the server. Result is in julia.bmp\n";
 }
+catch (asio::error_code const &error) {
+	std::cerr << "Failed to download the Julia fractal: " << error.message() << '\n';
+}