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96 lines
2.7 KiB
C++
96 lines
2.7 KiB
C++
#pragma once
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#include <Client/Connection.h>
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#include <Core/Block.h>
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#include <Interpreters/Context_fwd.h>
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#include <IO/ReadBuffer.h>
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#include <Server/HTTP/HTMLForm.h>
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#include <iosfwd>
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#include <memory>
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#include <string>
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#include <vector>
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namespace Poco::Net
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{
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class NameValueCollection;
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class MessageHeader;
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}
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namespace boost::program_options
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{
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class variables_map;
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}
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namespace DB
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{
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/// The base class containing the basic information about external table and
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/// basic functions for extracting this information from text fields.
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class BaseExternalTable
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{
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public:
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std::string file; /// File with data or '-' if stdin
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std::string name; /// The name of the table
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std::string format; /// Name of the data storage format
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/// Description of the table structure: (column name, data type name)
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std::vector<std::pair<std::string, std::string>> structure;
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std::unique_ptr<ReadBuffer> read_buffer;
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Block sample_block;
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virtual ~BaseExternalTable() = default;
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/// Initialize read_buffer, depending on the data source. By default, does nothing.
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virtual void initReadBuffer() {}
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/// Get the table data - a pair (a stream with the contents of the table, the name of the table)
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ExternalTableDataPtr getData(ContextPtr context);
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protected:
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/// Clear all accumulated information
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void clear();
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/// Construct the `structure` vector from the text field `structure`
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virtual void parseStructureFromStructureField(const std::string & argument);
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/// Construct the `structure` vector from the text field `types`
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virtual void parseStructureFromTypesField(const std::string & argument);
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private:
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/// Initialize sample_block according to the structure of the table stored in the `structure`
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void initSampleBlock();
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};
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/// Parsing of external table used in the tcp client.
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class ExternalTable : public BaseExternalTable
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{
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public:
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void initReadBuffer() override;
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/// Extract parameters from variables_map, which is built on the client command line
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explicit ExternalTable(const boost::program_options::variables_map & external_options);
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};
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/// Parsing of external table used when sending tables via http
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/// The `handlePart` function will be called for each table passed,
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/// so it's also necessary to call `clean` at the end of the `handlePart`.
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class ExternalTablesHandler : public HTMLForm::PartHandler, BaseExternalTable, WithMutableContext
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{
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public:
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ExternalTablesHandler(ContextMutablePtr context_, const Poco::Net::NameValueCollection & params_) : WithMutableContext(context_), params(params_) {}
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void handlePart(const Poco::Net::MessageHeader & header, ReadBuffer & stream) override;
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private:
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const Poco::Net::NameValueCollection & params;
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};
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}
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