mirror of
https://github.com/ClickHouse/ClickHouse.git
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83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
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#pragma once
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#include <Poco/URI.h>
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#include <Poco/SharedPtr.h>
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#include <Poco/Net/HTTPRequest.h>
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#include <Poco/Net/HTTPResponse.h>
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#include <Poco/Net/HTTPClientSession.h>
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#include <DB/IO/ReadBuffer.h>
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#include <DB/IO/ReadBufferFromIStream.h>
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#include <Yandex/logger_useful.h>
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#define DEFAULT_REMOTE_READ_BUFFER_TIMEOUT 1800
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namespace DB
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{
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/** Позволяет читать файл с удалённого сервера.
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*/
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class RemoteReadBuffer : public ReadBuffer
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{
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private:
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std::string host;
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int port;
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std::string path;
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bool compress;
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Poco::Net::HTTPClientSession session;
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std::istream * istr; /// этим владеет session
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Poco::SharedPtr<ReadBufferFromIStream> impl;
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public:
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RemoteReadBuffer(const std::string & host_, int port_, const std::string & path_, bool compress_ = true, size_t timeout_ = 0)
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: ReadBuffer(NULL, 0), host(host_), port(port_), path(path_), compress(compress_)
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{
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std::string encoded_path;
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Poco::URI::encode(path, "&#", encoded_path);
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std::stringstream uri;
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uri << "http://" << host << ":" << port << "/?action=read&path=" << encoded_path << "&compress=" << (compress ? "true" : "false");
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session.setHost(host);
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session.setPort(port);
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/// устанавливаем таймаут
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session.setTimeout(Poco::Timespan(timeout_ || DEFAULT_REMOTE_READ_BUFFER_TIMEOUT, 0));
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Poco::Net::HTTPRequest request(Poco::Net::HTTPRequest::HTTP_POST, uri.str());
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Poco::Net::HTTPResponse response;
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LOG_TRACE((&Logger::get("RemoteReadBuffer")), "Sending request to " << uri.str());
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session.sendRequest(request);
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istr = &session.receiveResponse(response);
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Poco::Net::HTTPResponse::HTTPStatus status = response.getStatus();
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if (status != Poco::Net::HTTPResponse::HTTP_OK)
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{
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std::stringstream error_message;
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error_message << "Received error from remote server " << uri.str() << ". HTTP status code: "
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<< status << ", body: " << istr->rdbuf();
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throw Exception(error_message.str(), ErrorCodes::RECEIVED_ERROR_FROM_REMOTE_IO_SERVER);
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}
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impl = new ReadBufferFromIStream(*istr);
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}
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bool nextImpl()
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{
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if (!impl->next())
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return false;
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internal_buffer = impl->buffer();
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working_buffer = internal_buffer;
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return true;
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}
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};
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}
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