mirror of
https://github.com/ClickHouse/ClickHouse.git
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84 lines
2.3 KiB
C++
84 lines
2.3 KiB
C++
#pragma once
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#include "IServer.h"
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#include <Poco/Net/HTTPRequestHandler.h>
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#include <Common/CurrentMetrics.h>
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#include <Common/HTMLForm.h>
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namespace CurrentMetrics
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{
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extern const Metric HTTPConnection;
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}
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namespace Poco { class Logger; }
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namespace DB
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{
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class WriteBufferFromHTTPServerResponse;
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class HTTPHandler : public Poco::Net::HTTPRequestHandler
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{
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public:
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explicit HTTPHandler(IServer & server_);
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void handleRequest(Poco::Net::HTTPServerRequest & request, Poco::Net::HTTPServerResponse & response) override;
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/// This method is called right before the query execution.
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virtual void customizeContext(DB::Context& /* context */) {}
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private:
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struct Output
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{
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/* Raw data
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* ↓
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* CascadeWriteBuffer out_maybe_delayed_and_compressed (optional)
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* ↓ (forwards data if an overflow is occur or explicitly via pushDelayedResults)
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* CompressedWriteBuffer out_maybe_compressed (optional)
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* ↓
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* WriteBufferFromHTTPServerResponse out
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*/
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std::shared_ptr<WriteBufferFromHTTPServerResponse> out;
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/// Points to 'out' or to CompressedWriteBuffer(*out), depending on settings.
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std::shared_ptr<WriteBuffer> out_maybe_compressed;
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/// Points to 'out' or to CompressedWriteBuffer(*out) or to CascadeWriteBuffer.
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std::shared_ptr<WriteBuffer> out_maybe_delayed_and_compressed;
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inline bool hasDelayed() const
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{
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return out_maybe_delayed_and_compressed != out_maybe_compressed;
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}
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};
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IServer & server;
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Poco::Logger * log;
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/// It is the name of the server that will be sent in an http-header X-ClickHouse-Server-Display-Name.
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String server_display_name;
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CurrentMetrics::Increment metric_increment{CurrentMetrics::HTTPConnection};
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/// Also initializes 'used_output'.
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void processQuery(
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Poco::Net::HTTPServerRequest & request,
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HTMLForm & params,
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Poco::Net::HTTPServerResponse & response,
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Output & used_output);
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void trySendExceptionToClient(
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const std::string & s,
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int exception_code,
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Poco::Net::HTTPServerRequest & request,
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Poco::Net::HTTPServerResponse & response,
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Output & used_output);
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static void pushDelayedResults(Output & used_output);
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};
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}
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