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https://github.com/ClickHouse/ClickHouse.git
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249 lines
8.1 KiB
C++
249 lines
8.1 KiB
C++
#include <map>
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#include <DB/Common/escapeForFileName.h>
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#include <DB/Core/Exception.h>
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#include <DB/Core/ErrorCodes.h>
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#include <DB/IO/ReadHelpers.h>
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#include <DB/IO/WriteHelpers.h>
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#include <DB/DataTypes/DataTypeArray.h>
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#include <DB/Columns/ColumnArray.h>
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#include <DB/Storages/StorageTinyLog.h>
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#define DBMS_STORAGE_LOG_DATA_FILE_EXTENSION ".bin"
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namespace DB
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{
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using Poco::SharedPtr;
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TinyLogBlockInputStream::TinyLogBlockInputStream(size_t block_size_, const Names & column_names_, StorageTinyLog & storage_)
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: block_size(block_size_), column_names(column_names_), storage(storage_), finished(false)
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{
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}
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Block TinyLogBlockInputStream::readImpl()
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{
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Block res;
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if (finished || (!streams.empty() && streams.begin()->second->compressed.eof()))
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{
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/** Закрываем файлы (ещё до уничтожения объекта).
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* Чтобы при создании многих источников, но одновременном чтении только из нескольких,
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* буферы не висели в памяти.
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*/
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finished = true;
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streams.clear();
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return res;
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}
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/// Если файлы не открыты, то открываем их.
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if (streams.empty())
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for (Names::const_iterator it = column_names.begin(); it != column_names.end(); ++it)
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addStream(*it, *storage.getDataTypeByName(*it));
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for (Names::const_iterator it = column_names.begin(); it != column_names.end(); ++it)
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{
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ColumnWithNameAndType column;
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column.name = *it;
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column.type = storage.getDataTypeByName(*it);
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column.column = column.type->createColumn();
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readData(*it, *column.type, *column.column);
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if (column.column->size())
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res.insert(column);
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}
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if (!res || streams.begin()->second->compressed.eof())
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{
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finished = true;
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streams.clear();
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}
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return res;
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}
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void TinyLogBlockInputStream::addStream(const String & name, const IDataType & type, size_t level)
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{
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/// Для массивов используются отдельные потоки для размеров.
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if (const DataTypeArray * type_arr = dynamic_cast<const DataTypeArray *>(&type))
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{
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String size_name = name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + Poco::NumberFormatter::format(level);
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streams.insert(std::make_pair(size_name, new Stream(storage.files[size_name].data_file.path())));
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addStream(name, *type_arr->getNestedType(), level + 1);
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}
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else
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streams.insert(std::make_pair(name, new Stream(storage.files[name].data_file.path())));
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}
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void TinyLogBlockInputStream::readData(const String & name, const IDataType & type, IColumn & column, size_t level)
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{
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/// Для массивов требуется сначала десериализовать размеры, а потом значения.
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if (const DataTypeArray * type_arr = dynamic_cast<const DataTypeArray *>(&type))
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{
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type_arr->deserializeOffsets(
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column,
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streams[name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + Poco::NumberFormatter::format(level)]->compressed,
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block_size);
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if (column.size())
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{
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IColumn & nested_column = dynamic_cast<ColumnArray &>(column).getData();
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readData(name, *type_arr->getNestedType(), nested_column, level + 1);
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if (nested_column.size() != dynamic_cast<ColumnArray &>(column).getOffsets()[column.size() - 1])
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throw Exception("Cannot read array data for all offsets", ErrorCodes::CANNOT_READ_ALL_DATA);
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}
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}
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else
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type.deserializeBinary(column, streams[name]->compressed, block_size);
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}
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TinyLogBlockOutputStream::TinyLogBlockOutputStream(StorageTinyLog & storage_)
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: storage(storage_)
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{
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for (NamesAndTypesList::const_iterator it = storage.columns->begin(); it != storage.columns->end(); ++it)
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addStream(it->first, *it->second);
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}
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void TinyLogBlockOutputStream::addStream(const String & name, const IDataType & type, size_t level)
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{
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/// Для массивов используются отдельные потоки для размеров.
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if (const DataTypeArray * type_arr = dynamic_cast<const DataTypeArray *>(&type))
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{
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String size_name = name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + Poco::NumberFormatter::format(level);
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streams.insert(std::make_pair(size_name, new Stream(storage.files[size_name].data_file.path())));
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addStream(name, *type_arr->getNestedType(), level + 1);
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}
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else
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streams.insert(std::make_pair(name, new Stream(storage.files[name].data_file.path())));
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}
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void TinyLogBlockOutputStream::writeData(const String & name, const IDataType & type, const IColumn & column, size_t level)
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{
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/// Для массивов требуется сначала сериализовать размеры, а потом значения.
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if (const DataTypeArray * type_arr = dynamic_cast<const DataTypeArray *>(&type))
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{
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type_arr->serializeOffsets(
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column,
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streams[name + ARRAY_SIZES_COLUMN_NAME_SUFFIX + Poco::NumberFormatter::format(level)]->compressed);
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writeData(name, *type_arr->getNestedType(), dynamic_cast<const ColumnArray &>(column).getData(), level + 1);
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}
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else
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type.serializeBinary(column, streams[name]->compressed);
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}
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void TinyLogBlockOutputStream::write(const Block & block)
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{
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storage.check(block);
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for (size_t i = 0; i < block.columns(); ++i)
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{
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const ColumnWithNameAndType & column = block.getByPosition(i);
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writeData(column.name, *column.type, *column.column);
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}
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}
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StorageTinyLog::StorageTinyLog(const std::string & path_, const std::string & name_, NamesAndTypesListPtr columns_)
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: path(path_), name(name_), columns(columns_)
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{
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if (columns->empty())
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throw Exception("Empty list of columns passed to StorageTinyLog constructor", ErrorCodes::EMPTY_LIST_OF_COLUMNS_PASSED);
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/// создаём файлы, если их нет
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String full_path = path + escapeForFileName(name) + '/';
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if (0 != mkdir(full_path.c_str(), S_IRWXU | S_IRWXG | S_IRWXO) && errno != EEXIST)
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throwFromErrno("Cannot create directory " + full_path, ErrorCodes::CANNOT_CREATE_DIRECTORY);
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for (NamesAndTypesList::const_iterator it = columns->begin(); it != columns->end(); ++it)
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addFile(it->first, *it->second);
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}
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void StorageTinyLog::addFile(const String & column_name, const IDataType & type, size_t level)
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{
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if (files.end() != files.find(column_name))
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throw Exception("Duplicate column with name " + column_name + " in constructor of StorageTinyLog.",
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ErrorCodes::DUPLICATE_COLUMN);
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if (const DataTypeArray * type_arr = dynamic_cast<const DataTypeArray *>(&type))
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{
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String size_column_suffix = ARRAY_SIZES_COLUMN_NAME_SUFFIX + Poco::NumberFormatter::format(level);
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ColumnData column_data;
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files.insert(std::make_pair(column_name + size_column_suffix, column_data));
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files[column_name + size_column_suffix].data_file = Poco::File(
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path + escapeForFileName(name) + '/' + escapeForFileName(column_name) + size_column_suffix + DBMS_STORAGE_LOG_DATA_FILE_EXTENSION);
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addFile(column_name, *type_arr->getNestedType(), level + 1);
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}
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else
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{
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ColumnData column_data;
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files.insert(std::make_pair(column_name, column_data));
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files[column_name].data_file = Poco::File(
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path + escapeForFileName(name) + '/' + escapeForFileName(column_name) + DBMS_STORAGE_LOG_DATA_FILE_EXTENSION);
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}
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}
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void StorageTinyLog::rename(const String & new_path_to_db, const String & new_name)
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{
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/// Переименовываем директорию с данными.
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Poco::File(path + escapeForFileName(name)).renameTo(new_path_to_db + escapeForFileName(new_name));
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path = new_path_to_db;
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name = new_name;
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for (Files_t::iterator it = files.begin(); it != files.end(); ++it)
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it->second.data_file = Poco::File(path + escapeForFileName(name) + '/' + escapeForFileName(it->first) + DBMS_STORAGE_LOG_DATA_FILE_EXTENSION);
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}
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BlockInputStreams StorageTinyLog::read(
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const Names & column_names,
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ASTPtr query,
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QueryProcessingStage::Enum & processed_stage,
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size_t max_block_size,
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unsigned threads)
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{
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check(column_names);
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processed_stage = QueryProcessingStage::FetchColumns;
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return BlockInputStreams(1, new TinyLogBlockInputStream(max_block_size, column_names, *this));
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}
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BlockOutputStreamPtr StorageTinyLog::write(
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ASTPtr query)
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{
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return new TinyLogBlockOutputStream(*this);
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}
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void StorageTinyLog::drop()
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{
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for (Files_t::iterator it = files.begin(); it != files.end(); ++it)
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if (it->second.data_file.exists())
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it->second.data_file.remove();
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}
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}
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