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#include <Formats/StructureToCapnProtoSchema.h>
#include <Formats/StructureToFormatSchemaUtils.h>
#include <Columns/ColumnString.h>
#include <DataTypes/DataTypeNullable.h>
#include <DataTypes/DataTypeLowCardinality.h>
#include <DataTypes/DataTypeArray.h>
#include <DataTypes/DataTypeMap.h>
#include <DataTypes/DataTypeTuple.h>
#include <DataTypes/DataTypeEnum.h>
#include <Common/StringUtils/StringUtils.h>
#include <Common/randomSeed.h>
#include <pcg_random.hpp>
namespace DB
{
using namespace StructureToFormatSchemaUtils;
namespace ErrorCodes
{
extern const int BAD_ARGUMENTS;
}
namespace
{
const std::unordered_map<TypeIndex, String> capn_proto_simple_type_names =
{
{TypeIndex::Int8, "Int8"},
{TypeIndex::UInt8, "UInt8"},
{TypeIndex::Int16, "Int16"},
{TypeIndex::UInt16, "UInt16"},
{TypeIndex::Int32, "Int32"},
{TypeIndex::UInt32, "UInt32"},
{TypeIndex::Int64, "Int64"},
{TypeIndex::UInt64, "UInt64"},
{TypeIndex::Int128, "Data"},
{TypeIndex::UInt128, "Data"},
{TypeIndex::Int256, "Data"},
{TypeIndex::UInt256, "Data"},
{TypeIndex::Float32, "Float32"},
{TypeIndex::Float64, "Float64"},
{TypeIndex::Decimal32, "Int32"},
{TypeIndex::Decimal64, "Int64"},
{TypeIndex::Decimal128, "Data"},
{TypeIndex::Decimal256, "Data"},
{TypeIndex::String, "Data"},
{TypeIndex::FixedString, "Data"},
{TypeIndex::UUID, "Data"},
{TypeIndex::Date, "UInt16"},
{TypeIndex::Date32, "Int32"},
{TypeIndex::DateTime, "UInt32"},
{TypeIndex::DateTime64, "Int64"},
{TypeIndex::IPv4, "UInt32"},
{TypeIndex::IPv6, "Data"},
};
void writeCapnProtoHeader(WriteBuffer & buf)
{
pcg64 rng(randomSeed());
size_t id = rng() | (1ull << 63); /// First bit should be 1
writeString(fmt::format("@0x{};\n\n", getHexUIntLowercase(id)), buf);
}
void writeFieldDefinition(WriteBuffer & buf, const String & type_name, const String & column_name, size_t & field_index, size_t indent)
{
writeIndent(buf, indent);
writeString(fmt::format("{} @{} : {};\n", getSchemaFieldName(column_name), field_index++, type_name), buf);
}
void startEnum(WriteBuffer & buf, const String & enum_name, size_t indent)
{
startNested(buf, enum_name, "enum", indent);
}
void startUnion(WriteBuffer & buf, size_t indent)
{
startNested(buf, "", "union", indent);
}
void startStruct(WriteBuffer & buf, const String & struct_name, size_t indent)
{
startNested(buf, struct_name, "struct", indent);
}
String prepareAndGetCapnProtoTypeName(WriteBuffer & buf, const DataTypePtr & data_type, const String & column_name, size_t indent);
void writeField(WriteBuffer & buf, const DataTypePtr & data_type, const String & column_name, size_t & field_index, size_t indent)
{
auto field_type_name = prepareAndGetCapnProtoTypeName(buf, data_type, column_name, indent);
writeFieldDefinition(buf, field_type_name, column_name, field_index, indent);
}
String prepareArrayAndGetCapnProtoTypeName(WriteBuffer & buf, const DataTypePtr & data_type, const String & column_name, size_t indent)
{
const auto & nested_type = assert_cast<const DataTypeArray &>(*data_type).getNestedType();
auto nested_type_name = prepareAndGetCapnProtoTypeName(buf, nested_type, column_name, indent);
return "List(" + nested_type_name + ")";
}
String prepareNullableAndGetCapnProtoTypeName(WriteBuffer & buf, const DataTypePtr & data_type, const String & column_name, size_t indent)
{
/// Nullable is represented as a struct with union with 2 fields:
///
/// struct Nullable
/// {
/// union
/// {
/// value @0 : Value;
/// null @1 : Void;
/// }
/// }
auto struct_name = getSchemaMessageName(column_name);
startStruct(buf, struct_name, indent);
auto nested_type_name = prepareAndGetCapnProtoTypeName(buf, assert_cast<const DataTypeNullable &>(*data_type).getNestedType(), column_name, indent);
startUnion(buf, indent + 1);
size_t field_index = 0;
writeFieldDefinition(buf, nested_type_name, "value", field_index, indent + 2);
writeFieldDefinition(buf, "Void", "null", field_index, indent + 2);
endNested(buf, indent + 1);
endNested(buf, indent);
return struct_name;
}
String prepareTupleAndGetCapnProtoTypeName(WriteBuffer & buf, const DataTypePtr & data_type, const String & column_name, size_t indent)
{
const auto & tuple_type = assert_cast<const DataTypeTuple &>(*data_type);
auto nested_names_and_types = getCollectedTupleElements(tuple_type);
String struct_name = getSchemaMessageName(column_name);
startStruct(buf, struct_name, indent);
size_t nested_field_index = 0;
for (const auto & [name, type] : nested_names_and_types)
writeField(buf, type, name, nested_field_index, indent + 1);
endNested(buf, indent);
return struct_name;
}
String prepareMapAndGetCapnProtoTypeName(WriteBuffer & buf, const DataTypePtr & data_type, const String & column_name, size_t indent)
{
/// We output/input Map type as follow CapnProto schema
///
/// struct Map
/// {
/// struct Entry
/// {
/// key @0: Key;
/// value @1: Value;
/// }
/// entries @0 :List(Entry);
/// }
const auto & map_type = assert_cast<const DataTypeMap &>(*data_type);
const auto & key_type = map_type.getKeyType();
const auto & value_type = map_type.getValueType();
String struct_name = getSchemaMessageName(column_name);
startStruct(buf, struct_name, indent);
startStruct(buf, "Entry", indent + 1);
auto key_type_name = prepareAndGetCapnProtoTypeName(buf, key_type, "key", indent + 2);
auto value_type_name = prepareAndGetCapnProtoTypeName(buf, value_type, "value", indent + 2);
size_t field_index = 0;
writeFieldDefinition(buf, key_type_name, "key", field_index, indent + 2);
writeFieldDefinition(buf, value_type_name, "value", field_index, indent + 2);
endNested(buf, indent + 1);
field_index = 0;
writeFieldDefinition(buf, "List(Entry)", "entries", field_index, indent + 1);
endNested(buf, indent);
return struct_name;
}
template <typename EnumType>
String prepareEnumAndGetCapnProtoTypeName(WriteBuffer & buf, const DataTypePtr & data_type, const String & column_name, size_t indent)
{
const auto & enum_type = assert_cast<const DataTypeEnum<EnumType> &>(*data_type);
String enum_name = getSchemaMessageName(column_name);
startEnum(buf, enum_name, indent);
const auto & names = enum_type.getAllRegisteredNames();
for (size_t i = 0; i != names.size(); ++i)
{
writeIndent(buf, indent + 1);
writeString(fmt::format("{} @{};\n", names[i], std::to_string(i)), buf);
}
endNested(buf, indent);
return enum_name;
}
String prepareAndGetCapnProtoTypeName(WriteBuffer & buf, const DataTypePtr & data_type, const String & column_name, size_t indent)
{
TypeIndex type_id = data_type->getTypeId();
switch (data_type->getTypeId())
{
case TypeIndex::Nullable:
return prepareNullableAndGetCapnProtoTypeName(buf, data_type, column_name, indent);
case TypeIndex::LowCardinality:
return prepareAndGetCapnProtoTypeName(buf, assert_cast<const DataTypeLowCardinality &>(*data_type).getDictionaryType(), column_name, indent);
case TypeIndex::Array:
return prepareArrayAndGetCapnProtoTypeName(buf, data_type, column_name, indent);
case TypeIndex::Tuple:
return prepareTupleAndGetCapnProtoTypeName(buf, data_type, column_name, indent);
case TypeIndex::Map:
return prepareMapAndGetCapnProtoTypeName(buf, data_type, column_name, indent);
case TypeIndex::Enum8:
return prepareEnumAndGetCapnProtoTypeName<Int8>(buf, data_type, column_name, indent);
case TypeIndex::Enum16:
return prepareEnumAndGetCapnProtoTypeName<Int16>(buf, data_type, column_name, indent);
default:
{
if (isBool(data_type))
return "Bool";
auto it = capn_proto_simple_type_names.find(type_id);
if (it == capn_proto_simple_type_names.end())
throw Exception(ErrorCodes::BAD_ARGUMENTS, "CapnProto type name is not found for type {}", data_type->getName());
return it->second;
}
}
}
}
void StructureToCapnProtoSchema::writeSchema(WriteBuffer & buf, const String & message_name, const NamesAndTypesList & names_and_types_)
{
auto names_and_types = collectNested(names_and_types_);
writeCapnProtoHeader(buf);
startStruct(buf, getSchemaMessageName(message_name), 0);
size_t field_index = 0;
for (const auto & [column_name, data_type] : names_and_types)
writeField(buf, data_type, column_name, field_index, 1);
endNested(buf, 0);
}
}
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