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56 lines
1.4 KiB
C++
56 lines
1.4 KiB
C++
#pragma once
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#include "config.h"
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#if USE_CAPNP
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#include <Core/Block.h>
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#include <Formats/CapnProtoUtils.h>
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#include <Processors/Formats/IRowInputFormat.h>
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#include <Processors/Formats/ISchemaReader.h>
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namespace DB
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{
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class FormatSchemaInfo;
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class ReadBuffer;
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/** A stream for reading messages in Cap'n Proto format in given schema.
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* Like Protocol Buffers and Thrift (but unlike JSON or MessagePack),
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* Cap'n Proto messages are strongly-typed and not self-describing.
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* The schema in this case cannot be compiled in, so it uses a runtime schema parser.
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* See https://capnproto.org/cxx.html
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*/
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class CapnProtoRowInputFormat final : public IRowInputFormat
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{
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public:
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CapnProtoRowInputFormat(ReadBuffer & in_, Block header, Params params_, const FormatSchemaInfo & info, const FormatSettings & format_settings_);
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String getName() const override { return "CapnProtoRowInputFormat"; }
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private:
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bool readRow(MutableColumns & columns, RowReadExtension &) override;
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kj::Array<capnp::word> readMessage();
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std::shared_ptr<CapnProtoSchemaParser> parser;
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capnp::StructSchema root;
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const FormatSettings format_settings;
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DataTypes column_types;
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Names column_names;
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};
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class CapnProtoSchemaReader : public IExternalSchemaReader
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{
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public:
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explicit CapnProtoSchemaReader(const FormatSettings & format_settings_);
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NamesAndTypesList readSchema() override;
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private:
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const FormatSettings format_settings;
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};
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}
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#endif // USE_CAPNP
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