http_emscripten.h

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#ifndef ENGINE_SHARED_HTTP_EMSCRIPTEN_H
#define ENGINE_SHARED_HTTP_EMSCRIPTEN_H
 
#include <base/detect.h>
#if defined(CONF_PLATFORM_EMSCRIPTEN)
 
#include <engine/http.h>
 
#include <atomic>
#include <chrono>
#include <condition_variable>
#include <deque>
#include <mutex>
#include <optional>
#include <string>
#include <unordered_map>
#include <utility>
#include <vector>
 
typedef struct emscripten_fetch_t emscripten_fetch_t;
 
class CHttpEmscripten;
 
class CHttpRequestEmscripten : public IHttpRequest
{
    friend CHttpEmscripten;
 
public:
    CHttpRequestEmscripten(const char *pUrl);
    ~CHttpRequestEmscripten() override;
 
    void Header(const char *pNameColonValue) override;
 
    void Abort() override;
 
private:
    CHttpEmscripten *m_pHttp;
 
    std::vector<std::pair<std::string, std::string>> m_vRequestHeaders;
 
    emscripten_fetch_t *m_pFetch = nullptr;
    bool m_CallbackFinished = false;
 
    bool ConfigureAndRun();
    void OnSuccess();
    void OnFailure();
    void OnProgress();
    void OnHeader(const char *pName, const char *pValue);
    void OnCompletionInternal(EHttpState State, const char *pErrorDetail);
 
    static void FetchCallbackSuccess(emscripten_fetch_t *pFetch);
    static void FetchCallbackFailure(emscripten_fetch_t *pFetch);
    static void FetchCallbackProgress(emscripten_fetch_t *pFetch);
};
 
class CHttpEmscripten : public IEngineHttp
{
    friend CHttpRequestEmscripten;
 
public:
    // Lifecycle
    bool Init(std::chrono::milliseconds ShutdownDelay) override;
    void Shutdown() override;
    ~CHttpEmscripten();
 
    // User
    void Run(std::shared_ptr<IHttpRequest> pRequest) override;
    bool HasIpresolveBug() const override;
 
private:
    void *m_pThread = nullptr;
 
    std::mutex m_Lock;
    std::condition_variable m_ConditionVariableInit;
    std::condition_variable m_ConditionVariableLoop;
    std::atomic<bool> m_Initialized = false;
    std::deque<std::shared_ptr<CHttpRequestEmscripten>> m_PendingRequests;
    std::unordered_map<emscripten_fetch_t *, EHttpState> m_PendingFetchChanges;
    std::unordered_map<emscripten_fetch_t *, std::shared_ptr<CHttpRequestEmscripten>> m_RunningRequests;
    std::chrono::milliseconds m_ShutdownDelay{};
    std::optional<std::chrono::time_point<std::chrono::steady_clock>> m_ShutdownTime;
    std::atomic<bool> m_Shutdown = false;
    std::atomic<bool> m_StartedShutdown = false;
 
    static void ThreadMain(void *pUser);
    void RunLoop();
    void AddPendingStateChange(emscripten_fetch_t *pFetch, EHttpState State);
};
 
#endif // CONF_PLATFORM_EMSCRIPTEN
#endif // ENGINE_SHARED_HTTP_EMSCRIPTEN_H