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194 lines
6.5 KiB
C++
194 lines
6.5 KiB
C++
#include "StorageXDBC.h"
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#include <DataStreams/IBlockOutputStream.h>
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#include <Formats/FormatFactory.h>
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#include <IO/ReadHelpers.h>
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#include <IO/ConnectionTimeoutsContext.h>
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#include <Interpreters/Context.h>
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#include <Interpreters/evaluateConstantExpression.h>
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#include <Parsers/ASTLiteral.h>
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#include <Poco/Net/HTTPRequest.h>
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#include <Poco/Path.h>
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#include <Processors/Pipe.h>
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#include <Storages/StorageFactory.h>
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#include <Storages/StorageURL.h>
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#include <Storages/transformQueryForExternalDatabase.h>
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#include <common/logger_useful.h>
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#include <Common/escapeForFileName.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 NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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}
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StorageXDBC::StorageXDBC(
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const StorageID & table_id_,
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const std::string & remote_database_name_,
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const std::string & remote_table_name_,
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const ColumnsDescription & columns_,
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ContextPtr context_,
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const BridgeHelperPtr bridge_helper_)
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/// Please add support for constraints as soon as StorageODBC or JDBC will support insertion.
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: IStorageURLBase(Poco::URI(),
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context_,
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table_id_,
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IXDBCBridgeHelper::DEFAULT_FORMAT,
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getFormatSettings(context_),
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columns_,
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ConstraintsDescription{},
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"" /* CompressionMethod */)
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, bridge_helper(bridge_helper_)
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, remote_database_name(remote_database_name_)
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, remote_table_name(remote_table_name_)
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{
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log = &Poco::Logger::get("Storage" + bridge_helper->getName());
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uri = bridge_helper->getMainURI();
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}
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std::string StorageXDBC::getReadMethod() const
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{
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return Poco::Net::HTTPRequest::HTTP_POST;
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}
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std::vector<std::pair<std::string, std::string>> StorageXDBC::getReadURIParams(
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const Names & /* column_names */,
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const StorageMetadataPtr & /* metadata_snapshot */,
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const 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) const
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{
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return bridge_helper->getURLParams(max_block_size);
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}
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std::function<void(std::ostream &)> StorageXDBC::getReadPOSTDataCallback(
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const Names & column_names,
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const StorageMetadataPtr & metadata_snapshot,
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const SelectQueryInfo & query_info,
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ContextPtr local_context,
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QueryProcessingStage::Enum & /*processed_stage*/,
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size_t /*max_block_size*/) const
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{
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String query = transformQueryForExternalDatabase(query_info,
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metadata_snapshot->getColumns().getOrdinary(),
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bridge_helper->getIdentifierQuotingStyle(),
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remote_database_name,
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remote_table_name,
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local_context);
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NamesAndTypesList cols;
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for (const String & name : column_names)
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{
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auto column_data = metadata_snapshot->getColumns().getPhysical(name);
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cols.emplace_back(column_data.name, column_data.type);
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}
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auto write_body_callback = [query, cols](std::ostream & os)
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{
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os << "sample_block=" << escapeForFileName(cols.toString());
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os << "&";
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os << "query=" << escapeForFileName(query);
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};
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return write_body_callback;
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}
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Pipe StorageXDBC::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 local_context,
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QueryProcessingStage::Enum processed_stage,
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size_t max_block_size,
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unsigned num_streams)
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{
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metadata_snapshot->check(column_names, getVirtuals(), getStorageID());
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bridge_helper->startBridgeSync();
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return IStorageURLBase::read(column_names, metadata_snapshot, query_info, local_context, processed_stage, max_block_size, num_streams);
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}
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BlockOutputStreamPtr StorageXDBC::write(const ASTPtr & /*query*/, const StorageMetadataPtr & metadata_snapshot, ContextPtr local_context)
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{
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bridge_helper->startBridgeSync();
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Poco::URI request_uri = uri;
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request_uri.setPath("/write");
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auto url_params = bridge_helper->getURLParams(65536);
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for (const auto & [param, value] : url_params)
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request_uri.addQueryParameter(param, value);
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request_uri.addQueryParameter("db_name", remote_database_name);
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request_uri.addQueryParameter("table_name", remote_table_name);
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request_uri.addQueryParameter("format_name", format_name);
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request_uri.addQueryParameter("sample_block", metadata_snapshot->getSampleBlock().getNamesAndTypesList().toString());
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return std::make_shared<StorageURLBlockOutputStream>(
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request_uri,
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format_name,
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getFormatSettings(local_context),
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metadata_snapshot->getSampleBlock(),
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local_context,
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ConnectionTimeouts::getHTTPTimeouts(local_context),
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chooseCompressionMethod(uri.toString(), compression_method));
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}
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Block StorageXDBC::getHeaderBlock(const Names & column_names, const StorageMetadataPtr & metadata_snapshot) const
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{
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return metadata_snapshot->getSampleBlockForColumns(column_names, getVirtuals(), getStorageID());
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}
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std::string StorageXDBC::getName() const
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{
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return bridge_helper->getName();
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}
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namespace
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{
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template <typename BridgeHelperMixin>
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void registerXDBCStorage(StorageFactory & factory, const std::string & name)
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{
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factory.registerStorage(name, [name](const StorageFactory::Arguments & args)
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{
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ASTs & engine_args = args.engine_args;
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if (engine_args.size() != 3)
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throw Exception("Storage " + name + " requires exactly 3 parameters: " + name + "('DSN', database or schema, table)",
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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for (size_t i = 0; i < 3; ++i)
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engine_args[i] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[i], args.getLocalContext());
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BridgeHelperPtr bridge_helper = std::make_shared<XDBCBridgeHelper<BridgeHelperMixin>>(args.getContext(),
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args.getContext()->getSettingsRef().http_receive_timeout.value,
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engine_args[0]->as<ASTLiteral &>().value.safeGet<String>());
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return std::make_shared<StorageXDBC>(args.table_id,
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engine_args[1]->as<ASTLiteral &>().value.safeGet<String>(),
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engine_args[2]->as<ASTLiteral &>().value.safeGet<String>(),
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args.columns,
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args.getContext(),
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bridge_helper);
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},
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{
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.source_access_type = BridgeHelperMixin::getSourceAccessType(),
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});
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}
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}
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void registerStorageJDBC(StorageFactory & factory)
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{
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registerXDBCStorage<JDBCBridgeMixin>(factory, "JDBC");
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}
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void registerStorageODBC(StorageFactory & factory)
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{
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registerXDBCStorage<ODBCBridgeMixin>(factory, "ODBC");
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}
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}
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