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#pragma once
#include <IO/ReadBufferFromFileBase.h>
#include <IO/BufferWithOwnMemory.h>
#include <IO/ReadSettings.h>
#include <Interpreters/Context.h>
#include <Poco/Net/HTTPBasicCredentials.h>
namespace DB
{
/* Read buffer, which reads via http, but is used as ReadBufferFromFileBase.
* Used to read files, hosted on a web server with static files.
*/
class ReadBufferFromWebServer : public ReadBufferFromFileBase
{
public:
explicit ReadBufferFromWebServer(
const String & url_,
ContextPtr context_,
const ReadSettings & settings_ = {},
bool use_external_buffer_ = false,
size_t read_until_position = 0);
bool nextImpl() override;
off_t seek(off_t off, int whence) override;
off_t getPosition() override;
String getFileName() const override { return url; }
void setReadUntilPosition(size_t position) override;
size_t getFileOffsetOfBufferEnd() const override { return offset; }
bool supportsRightBoundedReads() const override { return true; }
private:
std::unique_ptr<ReadBuffer> initialize();
Poco::Logger * log;
ContextPtr context;
const String url;
size_t buf_size;
std::unique_ptr<ReadBuffer> impl;
ReadSettings read_settings;
Poco::Net::HTTPBasicCredentials credentials{};
bool use_external_buffer;
off_t offset = 0;
off_t read_until_position = 0;
};
}
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