library/cpp/http/server/http.h


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#pragma once

#include "conn.h" 
#include "options.h" 
 
#include <util/thread/pool.h>
#include <library/cpp/http/io/stream.h>
#include <util/memory/blob.h> 
#include <util/generic/ptr.h>
#include <util/generic/vector.h>
#include <util/system/atomic.h>
 
class IThreadFactory;
class TClientRequest; 
class TClientConnection; 

class THttpServer { 
    friend class TClientRequest;
    friend class TClientConnection;
 
public:
    class ICallBack {
    public: 
        struct TFailLogData {
            int failstate;
            TString url;
        };
 
        virtual ~ICallBack() {
        }
 
        virtual void OnFailRequest(int /*failstate*/) {
        }
 
        virtual void OnFailRequestEx(const TFailLogData& d) {
            OnFailRequest(d.failstate);
        }
 
        virtual void OnException() {
        }
 
        virtual void OnMaxConn() {
        }
 
        virtual TClientRequest* CreateClient() = 0;
 
        virtual void OnListenStart() {
        }
 
        virtual void OnListenStop() {
        }
 
        virtual void OnWait() {
        }
 
        virtual void* CreateThreadSpecificResource() { 
            return nullptr;
        }
 
        virtual void DestroyThreadSpecificResource(void*) {
        }
    };
 
    typedef THttpServerOptions TOptions;
    typedef TSimpleSharedPtr<IThreadPool> TMtpQueueRef;
 
    THttpServer(ICallBack* cb, const TOptions& options = TOptions(), IThreadFactory* pool = nullptr);
    THttpServer(ICallBack* cb, TMtpQueueRef mainWorkers, TMtpQueueRef failWorkers, const TOptions& options = TOptions());
    virtual ~THttpServer();
 
    bool Start();
 
    // shutdown a.s.a.p.
    void Stop();
 
    // graceful shutdown with serving all already open connections
    void Shutdown();
 
    void Wait();
    int GetErrorCode();
    const char* GetError();
    void RestartRequestThreads(ui32 nTh, ui32 maxQS);
    const TOptions& Options() const noexcept;
    i64 GetClientCount() const;
 
    class TImpl;
    size_t GetRequestQueueSize() const;
    size_t GetFailQueueSize() const;
 
    const IThreadPool& GetRequestQueue() const;
    const IThreadPool& GetFailQueue() const;

    static TAtomicBase AcceptReturnsInvalidSocketCounter();

private:
    bool MaxRequestsReached() const;

private:
    THolder<TImpl> Impl_;
};

/**
 * @deprecated Use TRequestReplier instead
 */
class TClientRequest: public IObjectInQueue { 
    friend class THttpServer::TImpl;
 
public:
    TClientRequest();
    ~TClientRequest() override;
 
    inline THttpInput& Input() noexcept {
        return *HttpConn_->Input();
    }
 
    inline THttpOutput& Output() noexcept {
        return *HttpConn_->Output();
    }
 
    THttpServer* HttpServ() const noexcept;
    const TSocket& Socket() const noexcept;
    NAddr::IRemoteAddrRef GetListenerSockAddrRef() const noexcept;
    TInstant AcceptMoment() const noexcept;
 
    bool IsLocal() const;
    bool CheckLoopback();
    void ProcessFailRequest(int failstate);
 
    void ReleaseConnection();
 
    void ResetConnection();

private:
    /*
     * Processes the request after 'connection' been created and 'Headers' been read
     * Returns 'false' if the processing must be continued by the next handler,
     * 'true' otherwise ('this' will be deleted)
     */
    virtual bool Reply(void* ThreadSpecificResource);
    void Process(void* ThreadSpecificResource) override;
 
public:
    TVector<std::pair<TString, TString>> ParsedHeaders;
    TString RequestString;
 
private:
    THolder<TClientConnection> Conn_;
    THolder<THttpServerConn> HttpConn_;
}; 
 
class TRequestReplier: public TClientRequest { 
public:
    TRequestReplier();
    ~TRequestReplier() override;

    struct TReplyParams {
        void* ThreadSpecificResource;
        THttpInput& Input;
        THttpOutput& Output;
    };

    /*
     * Processes the request after 'connection' been created and 'Headers' been read
     * Returns 'false' if the processing must be continued by the next handler,
     * 'true' otherwise ('this' will be deleted)
     */
    virtual bool DoReply(const TReplyParams& params) = 0;

private:
    bool Reply(void* threadSpecificResource) final;

    using TClientRequest::Input;
    using TClientRequest::Output;
};

bool TryToBindAddresses(const THttpServerOptions& options, const std::function<void(TSocket)>* callbackOnBoundAddress = nullptr);