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471 lines
17 KiB
C++
471 lines
17 KiB
C++
#include "StoragePostgreSQL.h"
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#if USE_LIBPQXX
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#include <Processors/Transforms/PostgreSQLSource.h>
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#include <Common/parseAddress.h>
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#include <Common/assert_cast.h>
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#include <Common/parseRemoteDescription.h>
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#include <Core/Settings.h>
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#include <base/logger_useful.h>
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#include <DataTypes/DataTypeString.h>
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#include <DataTypes/DataTypeArray.h>
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#include <DataTypes/DataTypeDate.h>
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#include <DataTypes/DataTypeDateTime.h>
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#include <DataTypes/DataTypesDecimal.h>
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#include <DataTypes/DataTypeNullable.h>
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#include <Columns/ColumnString.h>
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#include <Columns/ColumnArray.h>
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#include <Columns/ColumnsNumber.h>
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#include <Columns/ColumnDecimal.h>
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#include <Columns/ColumnNullable.h>
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#include <Formats/FormatSettings.h>
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#include <IO/WriteHelpers.h>
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#include <IO/Operators.h>
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#include <Interpreters/evaluateConstantExpression.h>
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#include <Interpreters/Context.h>
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#include <Parsers/getInsertQuery.h>
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#include <Parsers/ASTLiteral.h>
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#include <Parsers/ASTFunction.h>
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#include <Processors/Sinks/SinkToStorage.h>
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#include <Storages/StorageFactory.h>
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#include <Storages/transformQueryForExternalDatabase.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int NOT_IMPLEMENTED;
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extern const int BAD_ARGUMENTS;
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extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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}
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StoragePostgreSQL::StoragePostgreSQL(
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const StorageID & table_id_,
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postgres::PoolWithFailoverPtr pool_,
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const String & remote_table_name_,
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const ColumnsDescription & columns_,
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const ConstraintsDescription & constraints_,
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const String & comment,
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const String & remote_table_schema_,
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const String & on_conflict_)
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: IStorage(table_id_)
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, remote_table_name(remote_table_name_)
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, remote_table_schema(remote_table_schema_)
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, on_conflict(on_conflict_)
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, pool(std::move(pool_))
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, log(&Poco::Logger::get("StoragePostgreSQL (" + table_id_.table_name + ")"))
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{
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StorageInMemoryMetadata storage_metadata;
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storage_metadata.setColumns(columns_);
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storage_metadata.setConstraints(constraints_);
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storage_metadata.setComment(comment);
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setInMemoryMetadata(storage_metadata);
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}
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Pipe StoragePostgreSQL::read(
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const Names & column_names_,
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const StorageMetadataPtr & metadata_snapshot,
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SelectQueryInfo & query_info_,
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ContextPtr context_,
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QueryProcessingStage::Enum /*processed_stage*/,
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size_t max_block_size_,
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unsigned)
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{
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metadata_snapshot->check(column_names_, getVirtuals(), getStorageID());
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/// Connection is already made to the needed database, so it should not be present in the query;
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/// remote_table_schema is empty if it is not specified, will access only table_name.
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String query = transformQueryForExternalDatabase(
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query_info_, metadata_snapshot->getColumns().getOrdinary(),
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IdentifierQuotingStyle::DoubleQuotes, remote_table_schema, remote_table_name, context_);
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LOG_TRACE(log, "Query: {}", query);
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Block sample_block;
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for (const String & column_name : column_names_)
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{
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auto column_data = metadata_snapshot->getColumns().getPhysical(column_name);
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WhichDataType which(column_data.type);
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if (which.isEnum())
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column_data.type = std::make_shared<DataTypeString>();
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sample_block.insert({ column_data.type, column_data.name });
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}
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return Pipe(std::make_shared<PostgreSQLSource<>>(pool->get(), query, sample_block, max_block_size_));
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}
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class PostgreSQLSink : public SinkToStorage
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{
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using Row = std::vector<std::optional<std::string>>;
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public:
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explicit PostgreSQLSink(
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const StorageMetadataPtr & metadata_snapshot_,
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postgres::ConnectionHolderPtr connection_holder_,
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const String & remote_table_name_,
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const String & remote_table_schema_,
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const String & on_conflict_)
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: SinkToStorage(metadata_snapshot_->getSampleBlock())
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, metadata_snapshot(metadata_snapshot_)
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, connection_holder(std::move(connection_holder_))
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, remote_table_name(remote_table_name_)
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, remote_table_schema(remote_table_schema_)
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, on_conflict(on_conflict_)
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{
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}
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String getName() const override { return "PostgreSQLSink"; }
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void consume(Chunk chunk) override
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{
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auto block = getHeader().cloneWithColumns(chunk.detachColumns());
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if (!inserter)
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{
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if (on_conflict.empty())
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{
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inserter = std::make_unique<StreamTo>(connection_holder->get(),
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remote_table_schema.empty() ? pqxx::table_path({remote_table_name})
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: pqxx::table_path({remote_table_schema, remote_table_name}), block.getNames());
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}
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else
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{
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inserter = std::make_unique<PreparedInsert>(connection_holder->get(), remote_table_name,
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remote_table_schema, block.getColumnsWithTypeAndName(), on_conflict);
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}
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}
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const auto columns = block.getColumns();
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const size_t num_rows = block.rows(), num_cols = block.columns();
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const auto data_types = block.getDataTypes();
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/// std::optional lets libpqxx to know if value is NULL
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std::vector<std::optional<std::string>> row(num_cols);
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for (const auto i : collections::range(0, num_rows))
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{
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for (const auto j : collections::range(0, num_cols))
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{
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if (columns[j]->isNullAt(i))
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{
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row[j] = std::nullopt;
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}
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else
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{
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WriteBufferFromOwnString ostr;
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if (isArray(data_types[j]))
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{
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parseArray((*columns[j])[i], data_types[j], ostr);
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}
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else
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{
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data_types[j]->getDefaultSerialization()->serializeText(*columns[j], i, ostr, FormatSettings{});
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}
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row[j] = ostr.str();
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}
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}
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inserter->insert(row);
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}
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}
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void onFinish() override
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{
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if (inserter)
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inserter->complete();
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}
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/// Cannot just use serializeAsText for array data type even though it converts perfectly
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/// any dimension number array into text format, because it encloses in '[]' and for postgres it must be '{}'.
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/// Check if array[...] syntax from PostgreSQL will be applicable.
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void parseArray(const Field & array_field, const DataTypePtr & data_type, WriteBuffer & ostr)
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{
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const auto * array_type = typeid_cast<const DataTypeArray *>(data_type.get());
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const auto & nested = array_type->getNestedType();
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const auto & array = array_field.get<Array>();
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if (!isArray(nested))
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{
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writeText(clickhouseToPostgresArray(array, data_type), ostr);
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return;
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}
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writeChar('{', ostr);
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const auto * nested_array_type = typeid_cast<const DataTypeArray *>(nested.get());
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for (auto iter = array.begin(); iter != array.end(); ++iter)
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{
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if (iter != array.begin())
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writeText(", ", ostr);
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if (!isArray(nested_array_type->getNestedType()))
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{
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writeText(clickhouseToPostgresArray(iter->get<Array>(), nested), ostr);
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}
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else
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{
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parseArray(*iter, nested, ostr);
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}
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}
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writeChar('}', ostr);
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}
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/// Conversion is done via column casting because with writeText(Array..) got incorrect conversion
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/// of Date and DateTime data types and it added extra quotes for values inside array.
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static std::string clickhouseToPostgresArray(const Array & array_field, const DataTypePtr & data_type)
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{
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auto nested = typeid_cast<const DataTypeArray *>(data_type.get())->getNestedType();
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auto array_column = ColumnArray::create(createNested(nested));
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array_column->insert(array_field);
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WriteBufferFromOwnString ostr;
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data_type->getDefaultSerialization()->serializeText(*array_column, 0, ostr, FormatSettings{});
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/// ostr is guaranteed to be at least '[]', i.e. size is at least 2 and 2 only if ostr.str() == '[]'
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assert(ostr.str().size() >= 2);
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return '{' + std::string(ostr.str().begin() + 1, ostr.str().end() - 1) + '}';
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}
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static MutableColumnPtr createNested(DataTypePtr nested)
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{
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bool is_nullable = false;
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if (nested->isNullable())
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{
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is_nullable = true;
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nested = static_cast<const DataTypeNullable *>(nested.get())->getNestedType();
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}
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WhichDataType which(nested);
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MutableColumnPtr nested_column;
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if (which.isString() || which.isFixedString()) nested_column = ColumnString::create();
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else if (which.isInt8() || which.isInt16()) nested_column = ColumnInt16::create();
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else if (which.isUInt8() || which.isUInt16()) nested_column = ColumnUInt16::create();
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else if (which.isInt32()) nested_column = ColumnInt32::create();
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else if (which.isUInt32()) nested_column = ColumnUInt32::create();
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else if (which.isInt64()) nested_column = ColumnInt64::create();
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else if (which.isUInt64()) nested_column = ColumnUInt64::create();
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else if (which.isFloat32()) nested_column = ColumnFloat32::create();
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else if (which.isFloat64()) nested_column = ColumnFloat64::create();
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else if (which.isDate()) nested_column = ColumnUInt16::create();
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else if (which.isDateTime()) nested_column = ColumnUInt32::create();
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else if (which.isDateTime64())
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{
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nested_column = ColumnDecimal<DateTime64>::create(0, 6);
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}
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else if (which.isDecimal32())
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{
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const auto & type = typeid_cast<const DataTypeDecimal<Decimal32> *>(nested.get());
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nested_column = ColumnDecimal<Decimal32>::create(0, type->getScale());
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}
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else if (which.isDecimal64())
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{
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const auto & type = typeid_cast<const DataTypeDecimal<Decimal64> *>(nested.get());
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nested_column = ColumnDecimal<Decimal64>::create(0, type->getScale());
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}
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else if (which.isDecimal128())
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{
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const auto & type = typeid_cast<const DataTypeDecimal<Decimal128> *>(nested.get());
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nested_column = ColumnDecimal<Decimal128>::create(0, type->getScale());
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}
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else if (which.isDecimal256())
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{
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const auto & type = typeid_cast<const DataTypeDecimal<Decimal256> *>(nested.get());
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nested_column = ColumnDecimal<Decimal256>::create(0, type->getScale());
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}
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else
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throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Type conversion not supported");
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if (is_nullable)
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return ColumnNullable::create(std::move(nested_column), ColumnUInt8::create(nested_column->size(), 0));
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return nested_column;
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}
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private:
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struct Inserter
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{
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pqxx::connection & connection;
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pqxx::work tx;
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explicit Inserter(pqxx::connection & connection_)
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: connection(connection_)
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, tx(connection) {}
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virtual ~Inserter() = default;
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virtual void insert(const Row & row) = 0;
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virtual void complete() = 0;
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};
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struct StreamTo : Inserter
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{
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Names columns;
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pqxx::stream_to stream;
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StreamTo(pqxx::connection & connection_, pqxx::table_path table_, Names columns_)
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: Inserter(connection_)
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, columns(std::move(columns_))
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, stream(pqxx::stream_to::raw_table(tx, connection.quote_table(table_), connection.quote_columns(columns)))
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{
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}
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void complete() override
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{
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stream.complete();
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tx.commit();
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}
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void insert(const Row & row) override
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{
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stream.write_values(row);
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}
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};
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struct PreparedInsert : Inserter
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{
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PreparedInsert(pqxx::connection & connection_, const String & table, const String & schema,
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const ColumnsWithTypeAndName & columns, const String & on_conflict_)
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: Inserter(connection_)
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{
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WriteBufferFromOwnString buf;
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buf << getInsertQuery(schema, table, columns, IdentifierQuotingStyle::DoubleQuotes);
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buf << " (";
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for (size_t i = 1; i <= columns.size(); ++i)
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{
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if (i > 1)
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buf << ", ";
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buf << "$" << i;
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}
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buf << ") ";
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buf << on_conflict_;
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connection.prepare("insert", buf.str());
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}
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void complete() override
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{
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connection.unprepare("insert");
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tx.commit();
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}
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void insert(const Row & row) override
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{
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pqxx::params params;
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params.reserve(row.size());
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params.append_multi(row);
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tx.exec_prepared("insert", params);
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}
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};
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StorageMetadataPtr metadata_snapshot;
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postgres::ConnectionHolderPtr connection_holder;
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const String remote_db_name, remote_table_name, remote_table_schema, on_conflict;
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std::unique_ptr<Inserter> inserter;
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};
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SinkToStoragePtr StoragePostgreSQL::write(
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const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, ContextPtr /* context */)
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{
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return std::make_shared<PostgreSQLSink>(metadata_snapshot, pool->get(), remote_table_name, remote_table_schema, on_conflict);
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}
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StoragePostgreSQLConfiguration StoragePostgreSQL::getConfiguration(ASTs engine_args, ContextPtr context)
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{
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StoragePostgreSQLConfiguration configuration;
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if (auto named_collection = getExternalDataSourceConfiguration(engine_args, context))
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{
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auto [common_configuration, storage_specific_args, _] = named_collection.value();
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configuration.set(common_configuration);
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configuration.addresses = {std::make_pair(configuration.host, configuration.port)};
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for (const auto & [arg_name, arg_value] : storage_specific_args)
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{
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if (arg_name == "on_conflict")
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configuration.on_conflict = arg_value->as<ASTLiteral>()->value.safeGet<String>();
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else
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throw Exception(ErrorCodes::BAD_ARGUMENTS,
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"Unexpected key-value argument."
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"Got: {}, but expected one of:"
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"host, port, username, password, database, table, schema, on_conflict.", arg_name);
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}
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}
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else
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{
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if (engine_args.size() < 5 || engine_args.size() > 7)
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throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH, "Storage PostgreSQL requires from 5 to 7 parameters: "
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"PostgreSQL('host:port', 'database', 'table', 'username', 'password' [, 'schema', 'ON CONFLICT ...']. Got: {}",
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engine_args.size());
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for (auto & engine_arg : engine_args)
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engine_arg = evaluateConstantExpressionOrIdentifierAsLiteral(engine_arg, context);
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const auto & host_port = engine_args[0]->as<ASTLiteral &>().value.safeGet<String>();
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size_t max_addresses = context->getSettingsRef().glob_expansion_max_elements;
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configuration.addresses = parseRemoteDescriptionForExternalDatabase(host_port, max_addresses, 5432);
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if (configuration.addresses.size() == 1)
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{
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configuration.host = configuration.addresses[0].first;
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configuration.port = configuration.addresses[0].second;
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}
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configuration.database = engine_args[1]->as<ASTLiteral &>().value.safeGet<String>();
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configuration.table = engine_args[2]->as<ASTLiteral &>().value.safeGet<String>();
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configuration.username = engine_args[3]->as<ASTLiteral &>().value.safeGet<String>();
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configuration.password = engine_args[4]->as<ASTLiteral &>().value.safeGet<String>();
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if (engine_args.size() >= 6)
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configuration.schema = engine_args[5]->as<ASTLiteral &>().value.safeGet<String>();
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if (engine_args.size() >= 7)
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configuration.on_conflict = engine_args[6]->as<ASTLiteral &>().value.safeGet<String>();
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}
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return configuration;
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}
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void registerStoragePostgreSQL(StorageFactory & factory)
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{
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factory.registerStorage("PostgreSQL", [](const StorageFactory::Arguments & args)
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{
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auto configuration = StoragePostgreSQL::getConfiguration(args.engine_args, args.getLocalContext());
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auto pool = std::make_shared<postgres::PoolWithFailover>(configuration,
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args.getContext()->getSettingsRef().postgresql_connection_pool_size,
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args.getContext()->getSettingsRef().postgresql_connection_pool_wait_timeout);
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return StoragePostgreSQL::create(
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args.table_id,
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std::move(pool),
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configuration.table,
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args.columns,
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args.constraints,
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args.comment,
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configuration.schema,
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configuration.on_conflict);
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},
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{
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.source_access_type = AccessType::POSTGRES,
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});
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}
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}
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#endif
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