ClickHouse/src/Dictionaries/HTTPDictionarySource.h

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#pragma once
#include <IO/ConnectionTimeouts.h>
#include <IO/ReadWriteBufferFromHTTP.h>
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#include <Poco/Net/HTTPBasicCredentials.h>
#include <Poco/URI.h>
#include <common/LocalDateTime.h>
#include "DictionaryStructure.h"
#include "IDictionarySource.h"
#include <Interpreters/Context.h>
namespace Poco
{
class Logger;
}
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namespace DB
{
/// Allows loading dictionaries from http[s] source
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class HTTPDictionarySource final : public IDictionarySource
{
public:
HTTPDictionarySource(
const DictionaryStructure & dict_struct_,
const Poco::Util::AbstractConfiguration & config,
const std::string & config_prefix,
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Block & sample_block_,
const Context & context_,
bool check_config);
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HTTPDictionarySource(const HTTPDictionarySource & other);
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HTTPDictionarySource & operator=(const HTTPDictionarySource &) = delete;
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BlockInputStreamPtr loadAll() override;
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BlockInputStreamPtr loadUpdatedAll() override;
BlockInputStreamPtr loadIds(const std::vector<UInt64> & ids) override;
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BlockInputStreamPtr loadKeys(const Columns & key_columns, const std::vector<size_t> & requested_rows) override;
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bool isModified() const override;
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bool supportsSelectiveLoad() const override;
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bool hasUpdateField() const override;
DictionarySourcePtr clone() const override;
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std::string toString() const override;
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private:
void getUpdateFieldAndDate(Poco::URI & uri);
Poco::Logger * log;
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LocalDateTime getLastModification() const;
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std::chrono::time_point<std::chrono::system_clock> update_time;
const DictionaryStructure dict_struct;
const std::string url;
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Poco::Net::HTTPBasicCredentials credentials;
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ReadWriteBufferFromHTTP::HTTPHeaderEntries header_entries;
std::string update_field;
const std::string format;
Block sample_block;
Context context;
ConnectionTimeouts timeouts;
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};
}