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#include "RedisSource.h"
#include <vector>
#include <Columns/ColumnNullable.h>
#include <Columns/ColumnString.h>
#include <Columns/ColumnsNumber.h>
#include <IO/ReadHelpers.h>
#include <IO/WriteHelpers.h>
#include <IO/ReadBufferFromString.h>
namespace DB
{
namespace ErrorCodes
{
extern const int TYPE_MISMATCH;
extern const int LOGICAL_ERROR;
extern const int NUMBER_OF_COLUMNS_DOESNT_MATCH;
extern const int INTERNAL_REDIS_ERROR;
extern const int UNKNOWN_TYPE;
}
RedisSource::RedisSource(
RedisConnectionPtr connection_,
const RedisArray & keys_,
const RedisStorageType & storage_type_,
const DB::Block & sample_block,
size_t max_block_size_)
: ISource(sample_block)
, connection(std::move(connection_))
, keys(keys_)
, storage_type(storage_type_)
, max_block_size{max_block_size_}
{
description.init(sample_block);
}
RedisSource::~RedisSource() = default;
namespace
{
using ValueType = ExternalResultDescription::ValueType;
template <typename T>
inline void insert(IColumn & column, const String & string_value)
{
assert_cast<ColumnVector<T> &>(column).insertValue(parse<T>(string_value));
}
void insertValue(IColumn & column, const ValueType type, const Poco::Redis::BulkString & bulk_string)
{
if (bulk_string.isNull())
throw Exception(ErrorCodes::TYPE_MISMATCH, "Type mismatch, expected not Null String");
const String & string_value = bulk_string.value();
switch (type)
{
case ValueType::vtUInt8:
insert<UInt8>(column, string_value);
break;
case ValueType::vtUInt16:
insert<UInt16>(column, string_value);
break;
case ValueType::vtUInt32:
insert<UInt32>(column, string_value);
break;
case ValueType::vtUInt64:
insert<UInt64>(column, string_value);
break;
case ValueType::vtInt8:
insert<Int8>(column, string_value);
break;
case ValueType::vtInt16:
insert<Int16>(column, string_value);
break;
case ValueType::vtInt32:
insert<Int32>(column, string_value);
break;
case ValueType::vtInt64:
insert<Int64>(column, string_value);
break;
case ValueType::vtFloat32:
insert<Float32>(column, string_value);
break;
case ValueType::vtFloat64:
insert<Float64>(column, string_value);
break;
case ValueType::vtEnum8:
case ValueType::vtEnum16:
case ValueType::vtString:
assert_cast<ColumnString &>(column).insert(parse<String>(string_value));
break;
case ValueType::vtDate:
assert_cast<ColumnUInt16 &>(column).insertValue(parse<LocalDate>(string_value).getDayNum());
break;
case ValueType::vtDateTime:
{
ReadBufferFromString in(string_value);
time_t time = 0;
readDateTimeText(time, in);
if (time < 0)
time = 0;
assert_cast<ColumnUInt32 &>(column).insertValue(static_cast<UInt32>(time));
break;
}
case ValueType::vtUUID:
assert_cast<ColumnUUID &>(column).insertValue(parse<UUID>(string_value));
break;
default:
throw Exception(ErrorCodes::UNKNOWN_TYPE,
"Value of unsupported type: {}",
column.getName());
}
}
}
Chunk RedisSource::generate()
{
if (keys.isNull() || description.sample_block.rows() == 0 || cursor >= keys.size())
all_read = true;
if (all_read)
return {};
const size_t size = description.sample_block.columns();
MutableColumns columns(size);
for (size_t i = 0; i < size; ++i)
columns[i] = description.sample_block.getByPosition(i).column->cloneEmpty();
const auto insert_value_by_idx = [this, &columns](size_t idx, const auto & value)
{
if (description.types[idx].second)
{
ColumnNullable & column_nullable = static_cast<ColumnNullable &>(*columns[idx]);
insertValue(column_nullable.getNestedColumn(), description.types[idx].first, value);
column_nullable.getNullMapData().emplace_back(0);
}
else
insertValue(*columns[idx], description.types[idx].first, value);
};
if (storage_type == RedisStorageType::HASH_MAP)
{
size_t num_rows = 0;
for (; cursor < keys.size(); ++cursor)
{
const auto & keys_array = keys.get<RedisArray>(cursor);
if (keys_array.size() < 2)
{
throw Exception(ErrorCodes::LOGICAL_ERROR,
"Too low keys in request to source: {}, expected 2 or more",
keys_array.size());
}
if (num_rows + keys_array.size() - 1 > max_block_size)
break;
Poco::Redis::Command command_for_values("HMGET");
for (const auto & elem : keys_array)
command_for_values.addRedisType(elem);
auto values = connection->client->execute<RedisArray>(command_for_values);
if (keys_array.size() != values.size() + 1) // 'HMGET' primary_key secondary_keys
throw Exception(ErrorCodes::NUMBER_OF_COLUMNS_DOESNT_MATCH,
"Inconsistent sizes of keys and values in Redis request");
const auto & primary_key = keys_array.get<RedisBulkString>(0);
for (size_t i = 0; i < values.size(); ++i)
{
const auto & secondary_key = keys_array.get<RedisBulkString>(i + 1);
const auto & value = values.get<RedisBulkString>(i);
/// null string means 'no value for requested key'
if (!value.isNull())
{
insert_value_by_idx(0, primary_key);
insert_value_by_idx(1, secondary_key);
insert_value_by_idx(2, value);
++num_rows;
}
}
}
}
else
{
Poco::Redis::Command command_for_values("MGET");
size_t need_values = std::min(max_block_size, keys.size() - cursor);
for (size_t i = 0; i < need_values; ++i)
command_for_values.add(keys.get<RedisBulkString>(cursor + i));
auto values = connection->client->execute<RedisArray>(command_for_values);
if (values.size() != need_values)
throw Exception(ErrorCodes::INTERNAL_REDIS_ERROR,
"Inconsistent sizes of keys and values in Redis request");
for (size_t i = 0; i < values.size(); ++i)
{
const auto & key = keys.get<RedisBulkString>(cursor + i);
const auto & value = values.get<RedisBulkString>(i);
/// Null string means 'no value for requested key'
if (!value.isNull())
{
insert_value_by_idx(0, key);
insert_value_by_idx(1, value);
}
}
cursor += need_values;
}
size_t num_rows = columns.at(0)->size();
return Chunk(std::move(columns), num_rows);
}
}
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