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

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#pragma once
#include <Poco/URI.h>
#include <Poco/SharedPtr.h>
#include <Poco/Net/HTTPRequest.h>
#include <Poco/Net/HTTPResponse.h>
#include <Poco/Net/HTTPClientSession.h>
#include <DB/IO/ReadBuffer.h>
#include <DB/IO/ReadBufferFromIStream.h>
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#include <common/logger_useful.h>
#define DEFAULT_HTTP_READ_BUFFER_TIMEOUT 1800
#define DEFAULT_HTTP_READ_BUFFER_CONNECTION_TIMEOUT 1
namespace DB
{
namespace ErrorCodes
{
extern const int RECEIVED_ERROR_FROM_REMOTE_IO_SERVER;
}
/** Делает указанный HTTP-запрос и отдает ответ.
*/
class ReadBufferFromHTTP : public ReadBuffer
{
private:
std::string host;
int port;
Poco::Net::HTTPClientSession session;
std::istream * istr; /// этим владеет session
Poco::SharedPtr<ReadBufferFromIStream> impl;
public:
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typedef std::vector<std::pair<String, String> > Params;
ReadBufferFromHTTP(
const std::string & host_,
int port_,
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const Params & params,
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))
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: ReadBuffer(nullptr, 0), host(host_), port(port_)
{
std::stringstream uri;
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uri << "http://" << host << ":" << port << "/";
bool first = true;
for (const auto & it : params)
{
uri << (first ? "?" : "&");
first = false;
String encoded_key;
String encoded_value;
Poco::URI::encode(it.first, "=&#", encoded_key);
Poco::URI::encode(it.second, "&#", encoded_value);
uri << encoded_key << "=" << encoded_value;
}
session.setHost(host);
session.setPort(port);
/// устанавливаем таймаут
session.setTimeout(connection_timeout, send_timeout, receive_timeout);
Poco::Net::HTTPRequest request(Poco::Net::HTTPRequest::HTTP_POST, uri.str());
Poco::Net::HTTPResponse response;
LOG_TRACE((&Logger::get("ReadBufferFromHTTP")), "Sending request to " << uri.str());
session.sendRequest(request);
istr = &session.receiveResponse(response);
Poco::Net::HTTPResponse::HTTPStatus status = response.getStatus();
if (status != Poco::Net::HTTPResponse::HTTP_OK)
{
std::stringstream error_message;
error_message << "Received error from remote server " << uri.str() << ". HTTP status code: "
<< status << ", body: " << istr->rdbuf();
throw Exception(error_message.str(), ErrorCodes::RECEIVED_ERROR_FROM_REMOTE_IO_SERVER);
}
impl = new ReadBufferFromIStream(*istr, buffer_size_);
}
bool nextImpl()
{
if (!impl->next())
return false;
internal_buffer = impl->buffer();
working_buffer = internal_buffer;
return true;
}
};
}