axmol/core/network/HttpClient-wasm.h

/****************************************************************************
 Copyright (c) 2012      greathqy
 Copyright (c) 2012      cocos2d-x.org
 Copyright (c) 2013-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

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 all copies or substantial portions of the Software.

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#pragma once

#include "base/Vector.h"
#include "network/HttpRequest.h"
#include "network/HttpResponse.h"
#include "network/HttpCookie.h"

struct emscripten_fetch_t;

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

NS_AX_BEGIN

namespace network {



/** Singleton that handles asynchronous http requests.
 *
 * Once the request completed, a callback will issued in main thread when it provided during make request.
 *
 * @lua NA
 */
class AX_DLL HttpClient
{
public:
    /**
    * The buffer size of _responseMessage
    */
    static const int RESPONSE_BUFFER_SIZE = 256;

    /**
     * Get instance of HttpClient.
     *
     * @return the instance of HttpClient.
     */
    static HttpClient* getInstance();

    /**
     * Release the instance of HttpClient.
     */
    static void destroyInstance();

    /**
     * Enable cookie support.
     *
     * @param [nullable] cookieFile the filepath of cookie file.
     */
    void enableCookies(const char* cookieFile);

    /**
     * Get the cookie filename
     *
     * @return the cookie filename
     */
    std::string_view getCookieFilename();

    /**
     * Set root certificate path for SSL verification.
     *
     * @param caFile a full path of root certificate.if it is empty, SSL verification is disabled.
     */
    void setSSLVerification(std::string_view caFile);

    /**
     * Get the ssl CA filename
     *
     * @return the ssl CA filename
     */
    std::string_view getSSLVerification();

    /**
     * Add a get request to task queue
     *
     * @param request a HttpRequest object, which includes url, response callback etc.
                      please make sure request->_requestData is clear before calling "send" here.
     */
    void send(HttpRequest* request);

    /**
     * Immediate send a request
     *
     * @param request a HttpRequest object, which includes url, response callback etc.
                      please make sure request->_requestData is clear before calling "sendImmediate" here.
     */
    void sendImmediate(HttpRequest* request);

    /**
     * Set the timeout value for connecting.
     *
     * @param value the timeout value for connecting.
     */
    void setTimeoutForConnect(int value);

    /**
     * Get the timeout value for connecting.
     *
     * @return int the timeout value for connecting.
     */
    int getTimeoutForConnect();

    /**
     * Set the timeout value for reading.
     *
     * @param value the timeout value for reading.
     */
    void setTimeoutForRead(int value);

    /**
     * Get the timeout value for reading.
     *
     * @return int the timeout value for reading.
     */
    int getTimeoutForRead();

    HttpCookie* getCookie() const {return _cookie; }

    typedef std::function<bool(HttpRequest*)> ClearRequestPredicate;
    typedef std::function<bool(HttpResponse*)> ClearResponsePredicate;

    /**
     * Clears the pending http responses and http requests
     * If defined, the method uses the ClearRequestPredicate and ClearResponsePredicate
     * to check for each request/response which to delete
     */
    void clearResponseAndRequestQueue(); 

    void clearResponseQueue() { clearResponseAndRequestQueue(); }

    /**
    * Sets a predicate function that is going to be called to determine if we proceed
    * each of the pending requests
    *
    * @param predicate function that will be called 
    */
    void setClearRequestPredicate(ClearRequestPredicate predicate) { _clearRequestPredicate = predicate; }

    /**
     Sets a predicate function that is going to be called to determine if we proceed
    * each of the pending requests
    *
    * @param cb predicate function that will be called 
    */
    void setClearResponsePredicate(ClearResponsePredicate predicate) { _clearResponsePredicate = predicate; }

        
private:
    HttpClient();
    virtual ~HttpClient();
    
    void processResponse(HttpResponse* response, bool isAlone);
    static void onRequestComplete(emscripten_fetch_t *fetch);
    void increaseThreadCount();
    void decreaseThreadCountAndMayDeleteThis();

private:
    int _timeoutForConnect;
    
    int _timeoutForRead;
    
    int _threadCount;
    
    Vector<HttpRequest*>  _requestQueue;
    
    std::string _cookieFilename;
    
    std::string _sslCaFilename;
    
    HttpCookie* _cookie;

    ClearRequestPredicate _clearRequestPredicate;
    ClearResponsePredicate _clearResponsePredicate;
};

} // namespace network

NS_AX_END

// end group
/// @}