axmol/core/network/HttpRequest.h

/****************************************************************************
 Copyright (c) 2010-2012 cocos2d-x.org
 Copyright (c) 2013-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
 Copyright (c) 2019-present Axmol Engine contributors (see AUTHORS.md).

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#ifndef __HTTP_REQUEST_H__
#define __HTTP_REQUEST_H__

#include <string>
#include <vector>
#include <memory>
#include <future>
#include "base/Ref.h"
#include "base/Macros.h"

#include "yasio/byte_buffer.hpp"

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

NS_AX_BEGIN

namespace network
{

class HttpClient;
class HttpResponse;

typedef std::function<void(HttpClient* client, HttpResponse* response)> ccHttpRequestCallback;

/**
 * Defines the object which users must packed for HttpClient::send(HttpRequest*) method.
 * Please refer to tests/test-cpp/Classes/ExtensionTest/NetworkTest/HttpClientTest.cpp as a sample
 * @since v2.0.2
 *
 * @lua NA
 */

class AX_DLL HttpRequest : public Ref
{
    friend class HttpClient;

public:
    static const int MAX_REDIRECT_COUNT = 3;

    /**
     * The HttpRequest type enum used in the HttpRequest::setRequestType.
     */
    enum class Type
    {
        GET,
        POST,
        PUT,
        DELETE,
        UNKNOWN,
    };

    /**
     *  Constructor.
     *   Because HttpRequest object will be used between UI thread and network thread,
         requestObj->autorelease() is forbidden to avoid crashes in AutoreleasePool
         new/retain/release still works, which means you need to release it manually
         Please refer to HttpRequestTest.cpp to find its usage.
     */
    HttpRequest() : _requestType(Type::UNKNOWN), _pCallback(nullptr), _pUserData(nullptr) {}

    /** Destructor. */
    virtual ~HttpRequest() {}

    /**
     * Override autorelease method to avoid developers to call it.
     * If this function was called, it would trigger assert in debug mode
     *
     * @return Ref* always return nullptr.
     */
    Ref* autorelease()
    {
        AXASSERT(false,
                 "HttpResponse is used between network thread and ui thread \
                 therefore, autorelease is forbidden here");
        return nullptr;
    }

    // setter/getters for properties

    /**
     * Set request type of HttpRequest object before being sent,now it support the enum value of HttpRequest::Type.
     *
     * @param type the request type.
     */
    void setRequestType(Type type) { _requestType = type; }

    /**
     * Get the request type of HttpRequest object.
     *
     * @return HttpRequest::Type.
     */
    Type getRequestType() const { return _requestType; }

    /**
     * Set the url address of HttpRequest object.
     * The url value could be like these: "http://httpbin.org/ip" or "https://httpbin.org/get"
     *
     * @param url the string object.
     */
    void setUrl(std::string_view url) { _url = url; }

    /**
     * Get the url address of HttpRequest object.
     *
     * @return const char* the pointer of _url.
     */
    std::string_view getUrl() const { return _url; }

    /**
     * Set the request data of HttpRequest object.
     *
     * @param buffer the buffer of request data, it support binary data.
     * @param len    the size of request data.
     */
    void setRequestData(const char* buffer, size_t len) { _requestData.assign(buffer, buffer + len); }

    /**
     * Get the request data pointer of HttpRequest object.
     *
     * @return char* the request data pointer.
     */
    char* getRequestData()
    {
        if (!_requestData.empty())
            return _requestData.data();

        return nullptr;
    }

    /**
     * Get the size of request data
     *
     * @return ssize_t the size of request data
     */
    ssize_t getRequestDataSize() const { return _requestData.size(); }

    /**
     * Set a string tag to identify your request.
     * This tag can be found in HttpResponse->getHttpRequest->getTag().
     *
     * @param tag the string object.
     */
    void setTag(std::string_view tag) { _tag = tag; }

    /**
     * Get the string tag to identify the request.
     * The best practice is to use it in your MyClass::onMyHttpRequestCompleted(sender, HttpResponse*) callback.
     *
     * @return const char* the pointer of _tag
     */
    std::string_view getTag() const { return _tag; }

    /**
     * Set user-customed data of HttpRequest object.
     * You can attach a customed data in each request, and get it back in response callback.
     * But you need to new/delete the data pointer manually.
     *
     * @param pUserData the string pointer
     */
    void setUserData(void* pUserData) { _pUserData = pUserData; }

    /**
     * Get the user-customed data pointer which were pre-setted.
     * Don't forget to delete it. HttpClient/HttpResponse/HttpRequest will do nothing with this pointer.
     *
     * @return void* the pointer of user-customed data.
     */
    void* getUserData() const { return _pUserData; }

    /**
     * Set response callback function of HttpRequest object.
     * When response come back, we would call _pCallback to process response data.
     *
     * @param callback the ccHttpRequestCallback function.
     */
    void setResponseCallback(const ccHttpRequestCallback& callback) { _pCallback = callback; }

    /**
     * Get ccHttpRequestCallback callback function.
     *
     * @return const ccHttpRequestCallback& ccHttpRequestCallback callback function.
     */
    const ccHttpRequestCallback& getCallback() const { return _pCallback; }

    /**
     * Set custom-defined headers.
     *
     * @param headers The string vector of custom-defined headers.
     */
    void setHeaders(const std::vector<std::string>& headers) { _headers = headers; }

    /**
     * Get custom headers.
     *
     * @return std::vector<std::string> the string vector of custom-defined headers.
     */
    const std::vector<std::string>& getHeaders() const { return _headers; }

    void setHosts(std::vector<std::string> hosts) { _hosts = std::move(hosts); }
    const std::vector<std::string>& getHosts() const { return _hosts; }

private:
    void setSync(bool sync)
    {
        if (sync)
            _syncState = std::make_shared<std::promise<HttpResponse*>>();
        else
            _syncState.reset();
    }

    std::shared_ptr<std::promise<HttpResponse*>> getSyncState() { return _syncState; }

    HttpResponse* wait()
    {
        if (_syncState)
            return _syncState->get_future().get();
        return nullptr;
    }

protected:
    // properties
    Type _requestType;                  /// kHttpRequestGet, kHttpRequestPost or other enums
    std::string _url;                   /// target url that this request is sent to
    yasio::sbyte_buffer _requestData;   /// used for POST
    std::string _tag;                   /// user defined tag, to identify different requests in response callback
    ccHttpRequestCallback _pCallback;   /// C++11 style callbacks
    void* _pUserData;                   /// You can add your customed data here
    std::vector<std::string> _headers;  /// custom http headers
    std::vector<std::string> _hosts;

    std::shared_ptr<std::promise<HttpResponse*>> _syncState;
};

}  // namespace network

NS_AX_END

// end group
/// @}

#endif  //__HTTP_REQUEST_H__