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#define ASIO_STANDALONE
#include <base64.hpp>
#include <chrono>
#include <fstream>
#include <functional>
#include <json.hpp>
#include <mutex>
#include <random>
#include <thread>
#include <websocketpp/config/asio_no_tls.hpp>
#include <websocketpp/server.hpp>
#include "cardset.h"
#include "database.h"
#include "imagestore.h"
#include "wizard.h"
namespace {
using socket_type = websocketpp::server<websocketpp::config::asio>;
class server {
public:
server(const cardset& cards, const imagestore& images, int port,
std::mt19937& rng)
: cards_(cards), images_(images), port_(port), rng_(rng) {
socket_.init_asio();
socket_.set_message_handler([this](websocketpp::connection_hdl connection,
socket_type::message_ptr message) {
on_message(connection, message);
});
}
void run() {
socket_.listen(port_);
socket_.start_accept();
asio::post(std::bind(&server::cleanup_thread, this));
std::cout << "Listening on port " << port_ << "..." << std::endl;
socket_.run();
}
private:
void on_message(websocketpp::connection_hdl connection,
socket_type::message_ptr message) {
nlohmann::json msgJson;
try {
msgJson = nlohmann::json::parse(message->get_payload());
} catch (const std::exception& ex) {
std::string response = R"(
{
"type": "error",
"msg": "Could not parse message."
}
)";
socket_.send(connection, response,
websocketpp::frame::opcode::value::TEXT);
return;
}
std::string cmd = msgJson["cmd"];
if (cmd == "generate") {
cmd_generate(connection, msgJson["text"]);
} else if (cmd == "check") {
cmd_check(connection, msgJson["token"]);
} else {
std::string response = R"(
{
"type": "error",
"msg": "No command in message."
}
)";
socket_.send(connection, response,
websocketpp::frame::opcode::value::TEXT);
return;
}
}
void cmd_generate(websocketpp::connection_hdl connection, std::string text) {
std::string token;
{
std::lock_guard rng_guard(rng_mutex_);
token = database_.create(rng_);
}
nlohmann::json tokenMsg;
tokenMsg["type"] = "token";
tokenMsg["token"] = token;
socket_.send(connection, tokenMsg.dump(),
websocketpp::frame::opcode::value::TEXT);
database_.subscribe(token, [this, connection](const std::string& msg) {
socket_.send(connection, msg, websocketpp::frame::opcode::value::TEXT);
});
asio::post(std::bind(&server::generate_thread, this, token, text));
}
void cmd_check(websocketpp::connection_hdl connection, std::string token) {
bool failed = false;
try {
database_.subscribe(token, [this, connection](const std::string& msg) {
socket_.send(connection, msg, websocketpp::frame::opcode::value::TEXT);
});
if (!database_.is_done(token)) {
return;
}
std::string result = database_.getResult(token);
nlohmann::json resultMsg;
if (result.empty()) {
resultMsg["type"] = "error";
resultMsg["msg"] = "Unknown error occurred.";
} else {
resultMsg["type"] = "result";
resultMsg["image"] = database_.getResult(token);
resultMsg["msg"] = "Success!";
}
socket_.send(connection, resultMsg.dump(),
websocketpp::frame::opcode::value::TEXT);
} catch (const std::exception& ex) {
failed = true;
}
if (failed) {
try {
socket_.send(connection, R"(
{
"type": "error",
"msg": "Error retrieving request."
})",
websocketpp::frame::opcode::value::TEXT);
} catch (const std::exception& ex) {
// Well, okay
std::cout << ex.what() << std::endl;
}
}
}
void generate_thread(std::string token, std::string text) {
std::unique_ptr<wizard> generator;
{
std::lock_guard rng_guard(rng_mutex_);
generator = std::make_unique<wizard>(cards_, images_, text, rng_);
}
try {
generator->set_status_callback([this, token](const std::string& status) {
nlohmann::json msg;
msg["type"] = "status";
msg["msg"] = status;
database_.post(token, msg.dump());
});
Magick::Image resultImage = generator->run();
Magick::Blob resultBlob;
resultImage.write(&resultBlob);
std::string resultBytes((const char*)resultBlob.data(),
resultBlob.length());
std::string resultEncoded = base64::to_base64(resultBytes);
database_.setResult(token, resultEncoded);
nlohmann::json resultMsg;
resultMsg["type"] = "result";
resultMsg["image"] = resultEncoded;
resultMsg["msg"] = "Success!";
database_.post(token, resultMsg.dump());
} catch (const std::exception& ex) {
nlohmann::json response;
response["type"] = "error";
response["msg"] =
std::string("Error generating card (") + ex.what() + ")";
database_.post(token, response.dump());
}
database_.mark_done(token);
}
void cleanup_thread() {
for (;;) {
// sleep
}
}
const cardset& cards_;
const imagestore& images_;
const int port_;
std::mutex rng_mutex_;
std::mt19937& rng_;
socket_type socket_;
database database_;
};
} // namespace
int main(int argc, char** argv) {
Magick::InitializeMagick(nullptr);
std::random_device randomDevice;
std::mt19937 rng(5); // randomDevice());
if (argc != 2) {
std::cout << "usage: wizard_server [configfile]" << std::endl;
return -1;
}
std::ifstream config_file(argv[1]);
nlohmann::json config_data = nlohmann::json::parse(config_file);
cardset cards(config_data["cards_path"]);
imagestore images(config_data["cache_path"]);
int port = config_data["port"];
server app(cards, images, port, rng);
app.run();
}
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