cppgraphqlgen/samples/proxy/server.cpp at issues-334 · gitmodimo/cppgraphqlgen · GitHub

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// Licensed under the MIT License.

#include "StarWarsData.h"

#include "graphqlservice/JSONResponse.h"

#ifdef _MSC_VER

#include <SDKDDKVer.h>

#endif // _MSC_VER

#include <boost/beast/core.hpp>

#include <boost/beast/http.hpp>

#include <boost/beast/version.hpp>

#include <boost/asio/ip/tcp.hpp>

#include <boost/asio/awaitable.hpp>

#include <boost/asio/co_spawn.hpp>

#include <boost/asio/use_awaitable.hpp>

#include <boost/config.hpp>

#include <algorithm>

#include <cstdio>

#include <cstdlib>

#include <iostream>

#include <iterator>

#include <memory>

#include <sstream>

#include <stdexcept>

#include <string>

#include <string_view>

#include <thread>

#include <vector>

using namespace std::literals;

using namespace graphql;

namespace beast = boost::beast;

namespace http = beast::http;

namespace net = boost::asio;

using tcp = boost::asio::ip::tcp;

using tcp_stream = typename beast::tcp_stream::rebind_executor<

net::use_awaitable_t<>::executor_with_default<net::any_io_executor>>::other;

constexpr net::string_view c_host { "127.0.0.1" };

constexpr unsigned short c_port = 8080;

constexpr beast::string_view c_target { "/graphql" };

// Based on:

// https://www.boost.org/doc/libs/1_82_0/libs/beast/example/http/server/awaitable/http_server_awaitable.cpp

int main()

{

auto service = star_wars::GetService();

std::cout << "Created the service..." << std::endl;

const auto address = net::ip::make_address(c_host);

// The io_context is required for all I/O.

net::io_context ioc;

// Spawn a listening port.

net::co_spawn(

ioc,

[](tcp::endpoint endpoint, std::shared_ptr<service::Request> service)

-> net::awaitable<void> {

// Open the acceptor.

auto acceptor =

net::use_awaitable.as_default_on(tcp::acceptor(co_await net::this_coro::executor));

acceptor.open(endpoint.protocol());

// Allow address reuse.

acceptor.set_option(net::socket_base::reuse_address(true));

// Bind to the server address.

acceptor.bind(endpoint);

// Start listening for connections.

acceptor.listen(net::socket_base::max_listen_connections);

while (true)

{

net::co_spawn(

acceptor.get_executor(),

[](tcp_stream stream, std::shared_ptr<service::Request> service)

-> net::awaitable<void> {

// This buffer is required to persist across reads

beast::flat_buffer buffer;

bool keepAlive = false;

// This lambda is used to send messages

try

{

// Set the timeout.

stream.expires_after(std::chrono::seconds(30));

// Read a request

http::request<http::string_body> req;

co_await http::async_read(stream, buffer, req);

// Handle the request

http::response<http::string_body> msg;

try

{

if (req.method() != http::verb::post

|| req.target() != c_target)

{

throw std::runtime_error(

"Only POST requests to /graphql are supported.");

}

else

{

std::ostringstream oss;

oss << req.body();

auto payload = response::parseJSON(oss.str());

if (payload.type() != response::Type::Map)

{

throw std::runtime_error("Invalid request!");

}

const auto queryItr = payload.find("query"sv);

if (queryItr == payload.end()

|| queryItr->second.type() != response::Type::String)

{

throw std::runtime_error("Invalid request!");

}

peg::ast query;

query = peg::parseString(

queryItr->second.get<response::StringType>());

if (!query.root)

{

throw std::runtime_error("Unknown error!");

}

const auto operationNameItr =

payload.find("operationName"sv);

const auto operationName =

(operationNameItr != payload.end()

&& operationNameItr->second.type()

== response::Type::String)

? std::string_view { operationNameItr->second

.get<response::StringType>() }

: std::string_view {};

const auto variablesItr = payload.find("variables"sv);

auto variables = (variablesItr != payload.end()

&& variablesItr->second.type()

== response::Type::String)

? response::parseJSON(

variablesItr->second.get<response::StringType>())

: response::Value {};

msg = http::response<http::string_body> { http::status::ok,

req.version() };

msg.set(http::field::server, BOOST_BEAST_VERSION_STRING);

msg.set(http::field::content_type, "application/json");

msg.keep_alive(req.keep_alive());

msg.body() = response::toJSON(

service

->resolve(

{ query, operationName, std::move(variables) })

.get());

msg.prepare_payload();

}

catch (const std::runtime_error& ex)

{

msg = http::response<http::string_body> {

http::status::bad_request,

req.version()

};

msg.set(http::field::server, BOOST_BEAST_VERSION_STRING);

msg.set(http::field::content_type, "text/plain");

msg.keep_alive(req.keep_alive());

msg.body() = "Error: "s + ex.what();

msg.prepare_payload();

}

// Determine if we should close the connection

keepAlive = msg.keep_alive();

// Send the response

co_await beast::async_write(stream,

http::message_generator { std::move(msg) },

net::use_awaitable);

} while (keepAlive);

}

catch (boost::system::system_error& se)

{

if (se.code() != http::error::end_of_stream)

throw;

}

// Send a TCP shutdown

beast::error_code ec;

stream.socket().shutdown(tcp::socket::shutdown_send, ec);

// At this point the connection is closed gracefully

// we ignore the error because the client might have

// dropped the connection already.

}(tcp_stream(co_await acceptor.async_accept()), service),

[](std::exception_ptr exp) {

if (exp)

{

try

{

std::rethrow_exception(exp);

}

catch (const std::exception& ex)

{

std::cerr << "Session error: " << ex.what() << std::endl;

}

});

}

}(tcp::endpoint(address, c_port), std::move(service)),

[](std::exception_ptr exp) {

if (exp)

{

std::rethrow_exception(exp);

}

});

try

{

ioc.run();

}

catch (const std::runtime_error& ex)

{

std::cerr << ex.what() << std::endl;

return 1;

}

return 0;

}

cppgraphqlgen/samples/proxy/server.cpp at issues-334 · gitmodimo/cppgraphqlgen · GitHub

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