SocketContext.cpp

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/*
 * SNode.C - A Slim Toolkit for Network Communication
 * Copyright (C) Volker Christian <me@vchrist.at>
 *               2020, 2021, 2022, 2023, 2024, 2025
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
/*
 * MIT License
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
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 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * THE SOFTWARE.
 */
 
#include "web/http/server/SocketContext.h" // IWYU pragma: export
 
#include "core/EventReceiver.h"
#include "core/socket/stream/SocketConnection.h"
#include "web/http/StatusCodes.h"
#include "web/http/server/Response.h"
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
#include "log/Logger.h"
#include "utils/Timeval.h"
 
#include <string>
#include <utility>
 
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
 
namespace web::http::server {
 
    SocketContext::SocketContext(
        core::socket::stream::SocketConnection* socketConnection,
        const std::function<void(const std::shared_ptr<Request>&, const std::shared_ptr<Response>&)>& onRequestReady)
        : Super(socketConnection)
        , onRequestReady(onRequestReady)
        , masterResponse(std::make_shared<Response>(this))
        , parser(
              this,
              [this]() {
                  LOG(INFO) << getSocketConnection()->getConnectionName() << " HTTP: Request start";
              },
              [this](web::http::server::Request&& request) {
                  LOG(INFO) << getSocketConnection()->getConnectionName() << " HTTP: Request parse success: " << request.method << " "
                            << request.url << " HTTP/" << request.httpMajor << "." << request.httpMinor;
 
                  pendingRequests.emplace_back(std::make_shared<Request>(std::move(request)));
 
                  if (pendingRequests.size() == 1) {
                      deliverRequest();
                  }
              },
              [this](int status, const std::string& reason) {
                  LOG(ERROR) << getSocketConnection()->getConnectionName() << " HTTP: Request parse error: " << reason << " (" << status
                             << ") ";
                  shutdownRead();
 
                  pendingRequests.emplace_back(std::make_shared<Request>(Request(status, reason)));
 
                  if (pendingRequests.size() == 1) {
                      deliverRequest();
                  }
              }) {
    }
 
    SocketContext* SocketContext::onConnected(std::function<void()> onConnectEventReceiver) {
        onConnectEventReceiverList.push_back(std::move(onConnectEventReceiver));
 
        return this;
    }
 
    SocketContext* SocketContext::onDisconnected(std::function<void()> onDisconnectEventReceiver) {
        onDisconnectEventReceiverList.push_back(std::move(onDisconnectEventReceiver));
 
        return this;
    }
 
    void SocketContext::deliverRequest() {
        if (!pendingRequests.empty()) {
            const std::shared_ptr<Request>& pendingRequest = pendingRequests.front();
 
            if (pendingRequest->status == 0) {
                LOG(INFO) << getSocketConnection()->getConnectionName() << " HTTP: Request deliver: " << pendingRequest->method << " "
                          << pendingRequest->url << " HTTP/" << pendingRequest->httpMajor << "." << pendingRequest->httpMinor;
 
                masterResponse->init();
                masterResponse->requestMethod = pendingRequest->method;
                masterResponse->httpMajor = pendingRequest->httpMajor;
                masterResponse->httpMinor = pendingRequest->httpMinor;
 
                const std::string connection = pendingRequest->get("Connection");
                if (!connection.empty()) {
                    masterResponse->set("Connection", connection);
                }
 
                onRequestReady(pendingRequest, masterResponse);
            } else {
                masterResponse->init();
                masterResponse->httpMajor = 1;
                masterResponse->httpMinor = 1;
 
                masterResponse->status(pendingRequest->status).send(pendingRequest->reason);
            }
        } else {
            LOG(INFO) << getSocketConnection()->getConnectionName() << " HTTP: No more pending request";
        }
    }
 
    void SocketContext::responseStarted(const Response& response) {
        if (!pendingRequests.empty()) {
            const std::shared_ptr<Request>& pendingRequest = pendingRequests.front();
 
            serverSentEvent = web::http::ciContains(pendingRequest->get("Accept"), "text/event-stream");
 
            if (serverSentEvent) {
                getSocketConnection()->setReadTimeout(0);
            }
 
            LOG(INFO) << getSocketConnection()->getConnectionName() << " HTTP: Response start for request: " << pendingRequest->method
                      << " " << pendingRequest->url << " HTTP/" << pendingRequest->httpMajor << "." << pendingRequest->httpMinor;
            LOG(INFO) << getSocketConnection()->getConnectionName() << "   "
                      << "HTTP/" + std::to_string(response.httpMajor)
                                       .append(".")
                                       .append(std::to_string(response.httpMinor))
                                       .append(" ")
                                       .append(std::to_string(response.statusCode))
                                       .append(" ")
                                       .append(StatusCode::reason(response.statusCode));
        }
    }
 
    void SocketContext::responseCompleted(const Response& response, bool success) {
        if (success) {
            requestCompleted(response);
        } else {
            LOG(WARNING) << getSocketConnection()->getConnectionName() << " HTTP: Response completed with error: " << response.statusCode
                         << " " << StatusCode::reason(response.statusCode);
 
            shutdownWrite(true);
        }
    }
 
    void SocketContext::requestCompleted(const Response& response) {
        const std::shared_ptr<Request> request = std::move(pendingRequests.front());
        pendingRequests.pop_front();
 
        LOG(INFO) << getSocketConnection()->getConnectionName() << " HTTP: Response completed for request: " << request->method << " "
                  << request->url << " HTTP/" << request->httpMajor << "." << request->httpMinor;
        LOG(INFO) << getSocketConnection()->getConnectionName() << "   "
                  << "HTTP/" + std::to_string(response.httpMajor)
                                   .append(".")
                                   .append(std::to_string(response.httpMinor))
                                   .append(" ")
                                   .append(std::to_string(response.statusCode))
                                   .append(" ")
                                   .append(StatusCode::reason(response.statusCode));
 
        httpClose = response.connectionState == ConnectionState::Close ||
                    (response.connectionState == ConnectionState::Default &&
                     ((response.httpMajor == 0 && response.httpMinor == 9) || (response.httpMajor == 1 && response.httpMinor == 0)));
 
        if (httpClose) {
            LOG(DEBUG) << getSocketConnection()->getConnectionName() << " HTTP: Connection = Close";
        } else {
            LOG(DEBUG) << getSocketConnection()->getConnectionName() << " HTTP: Connection = Keep-Alive";
 
            if (!pendingRequests.empty()) {
                core::EventReceiver::atNextTick([this, response = std::weak_ptr<Response>(masterResponse)]() {
                    if (!response.expired()) {
                        deliverRequest();
                    }
                });
            }
        }
    }
 
    void SocketContext::onConnected() {
        LOG(INFO) << getSocketConnection()->getConnectionName() << " HTTP: Connected";
 
        for (auto& onConnectEventReceiver : onConnectEventReceiverList) {
            onConnectEventReceiver();
        }
    }
 
    std::size_t SocketContext::onReceivedFromPeer() {
        std::size_t consumed = 0;
 
        if (!serverSentEvent && !httpClose) {
            consumed = parser.parse();
        }
 
        return consumed;
    }
 
    void SocketContext::onDisconnected() {
        masterResponse->disconnect();
 
        LOG(INFO) << getSocketConnection()->getConnectionName() << " HTTP: Received disconnect";
 
        for (auto& onDisconnectEventReceiver : onDisconnectEventReceiverList) {
            onDisconnectEventReceiver();
        }
    }
 
    bool SocketContext::onSignal(int signum) {
        LOG(INFO) << getSocketConnection()->getConnectionName() << " HTTP: Received signal " << signum;
 
        return true;
    }
 
    void SocketContext::onWriteError([[maybe_unused]] int errnum) {
        // Do nothing in case of an write error
    }
 
} // namespace web::http::server