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