c++cocos2d-x-3.x

Get execution time of http request


I have the following code:

void GameScene::onGetServersRequestCompleted( cocos2d::network::HttpClient *sender, cocos2d::network::HttpResponse *response )
{

if( 200 == response->getResponseCode() ) {
    std::vector<char> *buffer = response->getResponseData();
    std::string serversString( buffer->begin(), buffer->end() );

    Json::Reader reader;
    Json::Value root;

    reader.parse(serversString, root);

    const Json::Value servers = root["servers"];
    for ( int i = 0; i < servers.size(); ++i ) {
        //CCLOG("%s",  servers[i].asString().c_str());
        cocos2d::network::HttpRequest *request = new cocos2d::network::HttpRequest();
        request->setUrl("http://" + servers[i].asString() + "/info");
        request->setRequestType(cocos2d::network::HttpRequest::Type::GET);
        request->setResponseCallback(CC_CALLBACK_2(GameScene::onServerRequestCompleted, this));
        cocos2d::network::HttpClient::getInstance()->send(request);
        request->release();
    }

} else {
    CCLOG("Request Failed! Response Code: %i\n", response->getResponseCode());
    /*std::vector<char> *buffer = response->getResponseData();
    std::string serversString( buffer->begin(), buffer->end() );
    CCLOG("%s", serversString.c_str());*/
    this->serverIp = "185.8.166.41";
}

}

I am trying to get the right server. What I would like to do is to get the execution time of each server's request and get the fastest one. Is it possible? because it's an asynchronous function I don't know how to do it. How would you do it?


Solution

  • Does this help? From the documentation of HTTPRequest and HTTPResponse ....

    You can set a string tag to identify your request, this tag can be found in HttpResponse->getHttpRequest->getTag()

        void HTTPRequest::setTag(const char *tag);
    

    Get the string tag back to identify the request. The best practice is to use it in your MyClass::onMyHttpRequestCompleted(sender, HttpResponse*) callback

        const char* HTTPResponse::getTag();
    

    Edit: You can use these unique tags to pair up the requests with asynchronous responses in a global hash and thus measure "response time". There doesn't seem to be any interface in HTTP* classes to give you the time of execution.


    Edit: There are two ways to pair up HTTPResponse with a HTTPRequest. Here I try to use the second method with some quick/dirty code. Please convert/use it as you see fit.

    1. setTag/getTag
    2. setUserData/getUserData

    Create a file HTTPCustomData.h :

    #include <time.h>
    class HTTPCustomData {
        private:
            time_t t1;
        public:
            HTTPCustomData() { time(&t1); }
            double getTimePassed(void) {
                time_t t2; time(&t2); return(difftime(t2,t1));
            }
    };
    

    Use the following code where you send request:

    #include "HTTPCustomData.h"
    for ( int i = 0; i < servers.size(); ++i ) {
        // ...
        // ... Before "send"
        request->setUserData(new HTTPCustomData());
        cocos2d::network::HttpClient::getInstance()->send(request);
        request->release();
    }
    

    Later in GameScene::onServerRequestCompleted method, ...

    #include <memory>
    #include <iostream>
    #include "HTTPCustomData.h"
    void GameScene::onServerRequestCompleted(...) {
    {
        // ...
        std::unique_ptr<HTTPCustomData> h(
            (HTTPCustomData *)(response->getHTTPRequst()->getUserData())
        );
        std::cout << h->getTimePassed() << std::endl;
        // ....
    }