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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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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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/client/SocketContext.h" // IWYU pragma: export
 
#include "core/EventReceiver.h"
#include "core/socket/stream/SocketConnection.h"
#include "web/http/CookieOptions.h"
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
#include "log/Logger.h"
 
#include <utility>
 
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
 
// #define TRUE 1
// #define FALSE 0
 
namespace web::http::client {
 
    SocketContext::SocketContext(core::socket::stream::SocketConnection* socketConnection,
                                 const std::function<void(const std::shared_ptr<Request>&)>& onRequestBegin,
                                 const std::function<void(const std::shared_ptr<Request>&)>& onRequestEnd,
                                 bool pipelinedRequests)
        : Super(socketConnection)
        , onRequestBegin(onRequestBegin)
        , onRequestEnd(onRequestEnd)
        , pipelinedRequests(pipelinedRequests)
        , masterRequest(std::make_shared<Request>(this, getSocketConnection()->getConfiguredServer()))
        , parser(
              this,
              [this]() {
                  responseStarted();
              },
              [this](web::http::client::Response&& response) {
                  LOG(INFO) << getSocketConnection()->getConnectionName() << " HTTP: Response parsed: HTTP/" << response.httpMajor << "."
                            << response.httpMinor << " " << response.statusCode << " " << response.reason;
 
                  deliverResponse(std::move(response));
              },
              [this](int status, const std::string& reason) {
                  deliverResponseParseError(status, reason);
              }) {
        masterRequest->setMasterRequest(masterRequest);
    }
 
    SocketContext::~SocketContext() {
        if (!deliveredRequests.empty()) {
            LOG(DEBUG) << getSocketConnection()->getConnectionName() << " HTTP: Responses missed";
            for (const Request& request : deliveredRequests) {
                LOG(DEBUG) << "  " << request.method << " " << request.url << " HTTP/" << request.httpMajor << "." << request.httpMinor;
            }
        }
 
        if (!pendingRequests.empty()) {
            LOG(DEBUG) << getSocketConnection()->getConnectionName() << " HTTP: Requests ignored";
            for (const Request& request : pendingRequests) {
                LOG(DEBUG) << "  " << request.method << " " << request.url << " HTTP/" << request.httpMajor << "." << request.httpMinor;
            }
        }
    }
 
    void SocketContext::requestPrepared(Request&& request) {
        const std::string requestLine = std::string(request.method)
                                            .append(" ")
                                            .append(request.url)
                                            .append(" HTTP/")
                                            .append(std::to_string(request.httpMajor))
                                            .append(".")
                                            .append(std::to_string(request.httpMinor));
 
        if ((flags == Flags::NONE || (flags & Flags::HTTP11) == Flags::HTTP11 || (flags & Flags::KEEPALIVE) == Flags::KEEPALIVE) &&
            (flags & Flags::CLOSE) != Flags::CLOSE) {
            LOG(INFO) << getSocketConnection()->getConnectionName() << " HTTP: Request accepted: " << requestLine;
 
            flags = (flags & ~Flags::HTTP11) | ((request.httpMajor == 1 && request.httpMinor == 1) ? Flags::HTTP11 : Flags::NONE);
            flags = (flags & ~Flags::HTTP10) | ((request.httpMajor == 1 && request.httpMinor == 0) ? Flags::HTTP10 : Flags::NONE);
            flags = (flags & ~Flags::KEEPALIVE) |
                    (web::http::ciContains(request.header("Connection"), "keep-alive") ? Flags::KEEPALIVE : Flags::NONE);
            flags = (flags & ~Flags::CLOSE) | (web::http::ciContains(request.header("Connection"), "close") ? Flags::CLOSE : Flags::NONE);
 
            if (!currentRequest) {
                initiateRequest(request);
            } else {
                LOG(DEBUG) << getSocketConnection()->getConnectionName() << " HTTP: Request queued: " << requestLine;
 
                pendingRequests.emplace_back(std::move(request));
            }
        } else {
            LOG(WARNING) << getSocketConnection()->getConnectionName() << " HTTP: Request rejected: " << requestLine;
        }
    }
 
    void SocketContext::initiateRequest(Request& request) {
        currentRequest = std::make_shared<Request>(std::move(request));
 
        const std::string requestLine = std::string(currentRequest->method)
                                            .append(" ")
                                            .append(currentRequest->url)
                                            .append(" HTTP/")
                                            .append(std::to_string(currentRequest->httpMajor))
                                            .append(".")
                                            .append(std::to_string(currentRequest->httpMinor));
 
        LOG(DEBUG) << getSocketConnection()->getConnectionName() << " HTTP: Request delivering: " << requestLine;
 
        if (!currentRequest->initiate()) {
            LOG(WARNING) << getSocketConnection()->getConnectionName() << " HTTP: Request delivering failed: " << requestLine;
 
            core::EventReceiver::atNextTick([this, masterRequest = static_cast<std::weak_ptr<Request>>(masterRequest)]() {
                if (!masterRequest.expired()) {
                    if (!pendingRequests.empty()) {
                        Request& request = pendingRequests.front();
 
                        LOG(DEBUG) << getSocketConnection()->getConnectionName() << " HTTP: Request dequeued: " << request.method << " "
                                   << request.url << " HTTP/" << request.httpMajor << "." << request.httpMinor;
 
                        initiateRequest(request);
                        pendingRequests.pop_front();
                    } else {
                        currentRequest = nullptr;
                    }
                }
            });
        }
    }
 
    void SocketContext::requestDelivered(Request&& request, bool success) {
        const std::string requestLine = std::string(request.method)
                                            .append(" ")
                                            .append(request.url)
                                            .append(" HTTP/")
                                            .append(std::to_string(request.httpMajor))
                                            .append(".")
                                            .append(std::to_string(request.httpMinor));
 
        if (success) {
            LOG(DEBUG) << getSocketConnection()->getConnectionName() << " HTTP: Request delivered: " << requestLine;
 
            deliveredRequests.emplace_back(std::move(request));
 
            if (pipelinedRequests) {
                core::EventReceiver::atNextTick([this, masterRequest = static_cast<std::weak_ptr<Request>>(masterRequest)]() {
                    if (!masterRequest.expired()) {
                        if (!pendingRequests.empty()) {
                            Request& request = pendingRequests.front();
 
                            LOG(DEBUG) << getSocketConnection()->getConnectionName() << " HTTP: Request dequeued: " << request.method << " "
                                       << request.url << " HTTP/" << request.httpMajor << "." << request.httpMinor;
 
                            initiateRequest(request);
                            pendingRequests.pop_front();
                        } else {
                            currentRequest = nullptr;
                        }
                    }
                });
            }
        } else {
            LOG(WARNING) << getSocketConnection()->getConnectionName() << " HTTP: Request delivering failed: " << requestLine;
 
            shutdownWrite();
        }
    }
 
    void SocketContext::responseStarted() {
        if (!deliveredRequests.empty()) {
            const std::string requestLine = std::string(deliveredRequests.front().method)
                                                .append(" ")
                                                .append(deliveredRequests.front().url)
                                                .append(" HTTP/")
                                                .append(std::to_string(deliveredRequests.front().httpMajor))
                                                .append(".")
                                                .append(std::to_string(deliveredRequests.front().httpMinor));
 
            LOG(INFO) << getSocketConnection()->getConnectionName() << " HTTP: Response started: " << requestLine;
        } else {
            LOG(ERROR) << getSocketConnection()->getConnectionName() << " HTTP: Response without delivered request";
            shutdownWrite(true);
        }
    }
 
    void SocketContext::deliverResponse(Response&& response) {
        const std::shared_ptr<Request> request = std::make_shared<Request>(std::move(deliveredRequests.front()));
        deliveredRequests.pop_front();
 
        const std::string requestLine = std::string(request->method)
                                            .append(" ")
                                            .append(request->url)
                                            .append(" HTTP/")
                                            .append(std::to_string(request->httpMajor))
                                            .append(".")
                                            .append(std::to_string(request->httpMinor));
 
        LOG(INFO) << getSocketConnection()->getConnectionName() << " HTTP: Response ready: " << requestLine;
 
        const bool httpClose =
            response.connectionState == ConnectionState::Close ||
            (response.connectionState == ConnectionState::Default &&
             ((response.httpMajor == 0 && response.httpMinor == 9) || (response.httpMajor == 1 && response.httpMinor == 0)));
 
        request->deliverResponse(request, std::make_shared<Response>(std::move(response)));
 
        responseDelivered(httpClose);
 
        LOG(INFO) << getSocketConnection()->getConnectionName() << " HTTP: Response completed: " << requestLine;
    }
 
    void SocketContext::deliverResponseParseError(int status, const std::string& reason) {
        const std::shared_ptr<Request> request = std::make_shared<Request>(std::move(deliveredRequests.front()));
        deliveredRequests.pop_front();
 
        LOG(WARNING) << getSocketConnection()->getConnectionName() << " HTTP: Response parse error: " << reason << " (" << status << ") "
                     << std::string(request->method)
                            .append(" ")
                            .append(request->url)
                            .append(" HTTP/")
                            .append(std::to_string(request->httpMajor))
                            .append(".")
                            .append(std::to_string(request->httpMinor));
 
        request->deliverResponseParseError(request, reason);
 
        shutdownWrite(true);
    }
 
    void SocketContext::responseDelivered(bool httpClose) {
        if (httpClose) {
            LOG(DEBUG) << getSocketConnection()->getConnectionName() << " HTTP: Connection = Close";
        } else {
            LOG(DEBUG) << getSocketConnection()->getConnectionName() << " HTTP: Connection = Keep-Alive";
 
            if (!pipelinedRequests) {
                core::EventReceiver::atNextTick([this, masterRequest = static_cast<std::weak_ptr<Request>>(masterRequest)]() {
                    if (!masterRequest.expired()) {
                        if (!pendingRequests.empty()) {
                            Request& request = pendingRequests.front();
 
                            LOG(DEBUG) << getSocketConnection()->getConnectionName() << " HTTP: Request dequeued: " << request.method << " "
                                       << request.url << " HTTP/" << request.httpMajor << "." << request.httpMinor;
 
                            initiateRequest(request);
                            pendingRequests.pop_front();
                        } else {
                            currentRequest = nullptr;
                        }
                    }
                });
            }
        }
    }
 
    void SocketContext::onConnected() {
        LOG(INFO) << getSocketConnection()->getConnectionName() << " HTTP: connected";
 
        onRequestBegin(masterRequest);
    }
 
    std::size_t SocketContext::onReceivedFromPeer() {
        std::size_t consumed = 0;
 
        if (!deliveredRequests.empty()) {
            consumed = parser.parse();
        }
 
        return consumed;
    }
 
    void SocketContext::onDisconnected() {
        if (!deliveredRequests.empty()) {
            const Request& request = deliveredRequests.front();
            if (request.httpMajor == 1 && request.httpMinor == 0) {
                deliverResponse(parser.getResponse());
            }
        }
 
        onRequestEnd(masterRequest);
 
        LOG(INFO) << getSocketConnection()->getConnectionName() << " HTTP: disconnected";
    }
 
    bool SocketContext::onSignal([[maybe_unused]] 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::client