httpserver.h

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// Copyright (c) 2015-2017 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#ifndef FABCOIN_HTTPSERVER_H
#define FABCOIN_HTTPSERVER_H

#include <string>
#include <stdint.h>
#include <functional>
#include <mutex>
#include <condition_variable>

static const int DEFAULT_HTTP_THREADS=4;
static const int DEFAULT_HTTP_WORKQUEUE=16;
static const int DEFAULT_HTTP_SERVER_TIMEOUT=30;

struct evhttp_request;
struct event_base;
class CService;
class HTTPRequest;

bool InitHTTPServer();
bool StartHTTPServer();
void InterruptHTTPServer();
void StopHTTPServer();

bool UpdateHTTPServerLogging(bool enable);

typedef std::function<bool(HTTPRequest* req, const std::string &)> HTTPRequestHandler;
void RegisterHTTPHandler(const std::string &prefix, bool exactMatch, const HTTPRequestHandler &handler);
void UnregisterHTTPHandler(const std::string &prefix, bool exactMatch);

struct event_base* EventBase();

class HTTPRequest
{
private:
    struct evhttp_request* req;
    bool replySent;
    bool startedChunkTransfer;
    bool connClosed;

    std::mutex cs;
    std::condition_variable closeCv;

    void startDetectClientClose();
    void waitClientClose();

public:
    HTTPRequest(struct evhttp_request* req);
    ~HTTPRequest();

    enum RequestMethod {
        UNKNOWN,
        GET,
        POST,
        HEAD,
        PUT
    };

    void setConnClosed();
    bool isConnClosed();
    bool isChunkMode();

    std::string GetURI();

    CService GetPeer();

    RequestMethod GetRequestMethod();

    std::pair<bool, std::string> GetHeader(const std::string& hdr);

    std::string ReadBody();

    void WriteHeader(const std::string& hdr, const std::string& value);

    void WriteReply(int nStatus, const std::string& strReply = "");

    void Chunk(const std::string& chunk);

    void ChunkEnd();

    bool ReplySent();
};

class HTTPClosure
{
public:
    virtual void operator()() = 0;
    virtual ~HTTPClosure() {}
};

class HTTPEvent
{
public:
    HTTPEvent(struct event_base* base, bool deleteWhenTriggered, struct evbuffer *_databuf, const std::function<void(void)>& handler);
    ~HTTPEvent();

    void trigger(struct timeval* tv);

    bool deleteWhenTriggered;
    std::function<void(void)> handler;
private:
    struct evbuffer *databuf;
    struct event* ev;
};

std::string urlDecode(const std::string &urlEncoded);

#endif // FABCOIN_HTTPSERVER_H