axmol/cocos/network/HttpResponse.h

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#ifndef __HTTP_RESPONSE__
#define __HTTP_RESPONSE__
#include <ctype.h>
#include <unordered_map>
#include "network/HttpRequest.h"
#include "network/Uri.h"
#include "llhttp/llhttp.h"

/**
 * @addtogroup network
 * @{
 */

NS_CC_BEGIN

namespace network {

class HttpClient;
/**
 * @brief defines the object which users will receive at onHttpCompleted(sender, HttpResponse) callback.
 * Please refer to samples/TestCpp/Classes/ExtensionTest/NetworkTest/HttpClientTest.cpp as a sample.
 * @since v2.0.2.
 * @lua NA
 */
class CC_DLL HttpResponse : public cocos2d::Ref
{
    friend class HttpClient;
public:
    using ResponseHeaderMap = std::unordered_map<std::string, std::string>;

    /**
     * Constructor, it's used by HttpClient internal, users don't need to create HttpResponse manually.
     * @param request the corresponding HttpRequest which leads to this response.
     */
    HttpResponse(HttpRequest* request)
        : _pHttpRequest(request)
    {
        if (_pHttpRequest)
        {
            _pHttpRequest->retain();
        }
    }

    /**
     * Destructor, it will be called in HttpClient internal.
     * Users don't need to destruct HttpResponse object manually.
     */
    virtual ~HttpResponse()
    {
        if (_pHttpRequest)
        {
            _pHttpRequest->release();
        }
    }

    /**
     * Override autorelease method to prevent developers from calling it.
     * If this method is called , it would trigger CCASSERT.
     * @return cocos2d::Ref* always return nullptr.
     */
    cocos2d::Ref* autorelease()
    {
        CCASSERT(false, "HttpResponse is used between network thread and ui thread \
                        therefore, autorelease is forbidden here");
        return nullptr;
    }

    // getters, will be called by users

    /**
     * Get the corresponding HttpRequest object which leads to this response.
     * There's no paired setter for it, because it's already set in class constructor
     * @return HttpRequest* the corresponding HttpRequest object which leads to this response.
     */
    HttpRequest* getHttpRequest() const
    {
        return _pHttpRequest;
    }

    /**
     * Get the http response data.
     * @return std::vector<char>* the pointer that point to the _responseData.
     */
    std::vector<char>* getResponseData()
    {
        return &_responseData;
    }

    bool isSucceed() const {
        return _responseCode == 200;
    }

    /**
     * Get the http response code to judge whether response is successful or not.
     * I know that you want to see the _responseCode is 200.
     * If _responseCode is not 200, you should check the meaning for _responseCode by the net.
     * @return long the value of _responseCode
     */
    int getResponseCode() const
    {
        return _responseCode;
    }

    /*
    * The yasio error code, see yasio::errc
    */
    int getInternalCode() const { return _internalCode; }


    int getRedirectCount() const {
        return _redirectCount;
    }

    const ResponseHeaderMap& getResponseHeaders() const {
        return _responseHeaders;
    }

private:
    void updateInternalCode(int value) {
        if (_internalCode == 0)
            _internalCode = value;
    }

    /**
     * To see if the http request is finished.
     */
    bool isFinished() const {
        return _finished;
    }

    void handleInput(const std::vector<char>& data) {
        enum llhttp_errno err = llhttp_execute(&_context, data.data(), data.size());
        if (err != HPE_OK) {
            _finished = true;
        }
    }

    /**
     * Set the response data by the string pointer and the defined size.
     * @param value a string pointer that point to response data buffer.
     * @param n the defined size that the response data buffer would be copied.
     */
    bool prepareForProcess(const std::string& url)
    {
        /* Resets response status */
        _finished    = false;
        _responseData.clear();
        _currentHeader.clear();
        _responseCode = -1;
        _internalCode = 0;

        Uri uri = Uri::parse(url);
        if (!uri.isValid())
            return false;

        _requestUri = std::move(uri);
        
        /* Initialize user callbacks and settings */
        llhttp_settings_init(&_contextSettings);

        /* Initialize the parser in HTTP_BOTH mode, meaning that it will select between
         * HTTP_REQUEST and HTTP_RESPONSE parsing automatically while reading the first
         * input.
         */
        llhttp_init(&_context, HTTP_RESPONSE, &_contextSettings);

        _context.data = this;

        /* Set user callbacks */
        _contextSettings.on_header_field     = on_header_field;
        _contextSettings.on_header_value     = on_header_value;
        _contextSettings.on_body             = on_body;
        _contextSettings.on_message_complete = on_complete;

        return true;
    }

    const Uri& getRequestUri() const {
        return _requestUri;
    }

    int increaseRedirectCount() {
        return ++_redirectCount;
    }

    static int on_header_field(llhttp_t* context, const char* at, size_t length) {

        auto thiz = (HttpResponse*) context->data;
        thiz->_currentHeader.assign(at, length);
        std::transform(thiz->_currentHeader.begin(), thiz->_currentHeader.end(), thiz->_currentHeader.begin(), ::toupper);
        return 0;
    }
    static int on_header_value(llhttp_t* context, const char* at, size_t length) {
        auto thiz = (HttpResponse*) context->data;
        thiz->_responseHeaders.emplace(std::move(thiz->_currentHeader), std::string{at, length});
        return 0;
    }
    static int on_body(llhttp_t* context, const char* at, size_t length) {
        auto thiz = (HttpResponse*) context->data;
        thiz->_responseData.insert(thiz->_responseData.end(), at, at + length);
        return 0;
    }
    static int on_complete(llhttp_t* context) {
        auto thiz    = (HttpResponse*) context->data;
        thiz->_responseCode = context->status_code;
        thiz->_finished = true;
        return 0;
    }

protected:

    // properties
    HttpRequest*        _pHttpRequest;  /// the corresponding HttpRequest pointer who leads to this response
    int                 _redirectCount = 0;

    Uri                 _requestUri;
    bool                _finished = false;       /// to indicate if the http request is successful simply
    std::vector<char>   _responseData;  /// the returned raw data. You can also dump it as a string
    std::string         _currentHeader;
    ResponseHeaderMap   _responseHeaders; /// the returned raw header data. You can also dump it as a string
    int                 _responseCode = -1;    /// the status code returned from libcurl, e.g. 200, 404
    int                 _internalCode = 0;   /// the ret code of perform
    llhttp_t            _context;
    llhttp_settings_t   _contextSettings;
};

}

NS_CC_END

// end group
/// @}

#endif //__HTTP_RESPONSE_H__