ClickHouse/programs/library-bridge/Handlers.h

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#pragma once
#include <Interpreters/Context.h>
#include <Server/HTTP/HTTPRequestHandler.h>
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#include <base/logger_useful.h>
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#include "SharedLibraryHandler.h"
namespace DB
{
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/// Handler for requests to Library Dictionary Source, returns response in RowBinary format.
/// When a library dictionary source is created, it sends libNew request to library bridge (which is started on first
/// request to it, if it was not yet started). On this request a new sharedLibrayHandler is added to a
/// sharedLibraryHandlerFactory by a dictionary uuid. With libNew request come: library_path, library_settings,
/// names of dictionary attributes, sample block to parse block of null values, block of null values. Everything is
/// passed in binary format and is urlencoded. When dictionary is cloned, a new handler is created.
/// Each handler is unique to dictionary.
class LibraryRequestHandler : public HTTPRequestHandler, WithContext
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{
public:
LibraryRequestHandler(
size_t keep_alive_timeout_, ContextPtr context_)
: WithContext(context_)
, log(&Poco::Logger::get("LibraryRequestHandler"))
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, keep_alive_timeout(keep_alive_timeout_)
{
}
void handleRequest(HTTPServerRequest & request, HTTPServerResponse & response) override;
private:
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static constexpr inline auto FORMAT = "RowBinary";
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Poco::Logger * log;
size_t keep_alive_timeout;
};
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class LibraryExistsHandler : public HTTPRequestHandler, WithContext
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{
public:
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explicit LibraryExistsHandler(size_t keep_alive_timeout_, ContextPtr context_)
: WithContext(context_)
, keep_alive_timeout(keep_alive_timeout_)
, log(&Poco::Logger::get("LibraryRequestHandler"))
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{
}
void handleRequest(HTTPServerRequest & request, HTTPServerResponse & response) override;
private:
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const size_t keep_alive_timeout;
Poco::Logger * log;
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};
}