ClickHouse/dbms/include/DB/IO/ReadBufferFromHTTP.h

#pragma once

#include <memory>

#include <Poco/Net/HTTPClientSession.h>

#include <DB/IO/ReadBuffer.h>
#include <DB/Core/Types.h>

#define DEFAULT_HTTP_READ_BUFFER_TIMEOUT 1800
#define DEFAULT_HTTP_READ_BUFFER_CONNECTION_TIMEOUT 1


namespace DB
{

/** Perform HTTP-request and provide response to read.
  */
class ReadBufferFromHTTP : public ReadBuffer
{
private:
    String host;
    int port;
    String path;
    String method;

    Poco::Net::HTTPClientSession session;
    std::istream * istr;    /// owned by session
    std::unique_ptr<ReadBuffer> impl;

public:
    using Params = std::vector<std::pair<String, String>>;

    ReadBufferFromHTTP(
        const String & host_,
        int port_,
        const String & path_,
        const Params & params,
        const String & method_ = "",
        size_t buffer_size_ = DBMS_DEFAULT_BUFFER_SIZE,
        const Poco::Timespan & connection_timeout = Poco::Timespan(DEFAULT_HTTP_READ_BUFFER_CONNECTION_TIMEOUT, 0),
        const Poco::Timespan & send_timeout = Poco::Timespan(DEFAULT_HTTP_READ_BUFFER_TIMEOUT, 0),
        const Poco::Timespan & receive_timeout = Poco::Timespan(DEFAULT_HTTP_READ_BUFFER_TIMEOUT, 0));

    bool nextImpl() override;
};

}