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#include <Storages/StorageXDBC.h>
#include <Storages/StorageFactory.h>
#include <Storages/StorageURL.h>
#include <Storages/transformQueryForExternalDatabase.h>
#include <Storages/checkAndGetLiteralArgument.h>
#include <Formats/FormatFactory.h>
#include <IO/ConnectionTimeouts.h>
#include <Interpreters/Context.h>
#include <Interpreters/evaluateConstantExpression.h>
#include <Parsers/ASTLiteral.h>
#include <Poco/Net/HTTPRequest.h>
#include <QueryPipeline/Pipe.h>
#include <Common/logger_useful.h>
#include <Common/escapeForFileName.h>
namespace DB
{
namespace ErrorCodes
{
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
}
StorageXDBC::StorageXDBC(
const StorageID & table_id_,
const std::string & remote_database_name_,
const std::string & remote_table_name_,
ColumnsDescription columns_,
ConstraintsDescription constraints_,
const String & comment,
ContextPtr context_,
const BridgeHelperPtr bridge_helper_)
: IStorageURLBase(
"",
context_,
table_id_,
IXDBCBridgeHelper::DEFAULT_FORMAT,
getFormatSettings(context_),
columns_,
constraints_,
comment,
"" /* CompressionMethod */)
, bridge_helper(bridge_helper_)
, remote_database_name(remote_database_name_)
, remote_table_name(remote_table_name_)
, log(&Poco::Logger::get("Storage" + bridge_helper->getName()))
{
uri = bridge_helper->getMainURI().toString();
}
std::string StorageXDBC::getReadMethod() const
{
return Poco::Net::HTTPRequest::HTTP_POST;
}
std::vector<std::pair<std::string, std::string>> StorageXDBC::getReadURIParams(
const Names & /* column_names */,
const StorageSnapshotPtr & /*storage_snapshot*/,
const SelectQueryInfo & /*query_info*/,
ContextPtr /*context*/,
QueryProcessingStage::Enum & /*processed_stage*/,
size_t max_block_size) const
{
return bridge_helper->getURLParams(max_block_size);
}
std::function<void(std::ostream &)> StorageXDBC::getReadPOSTDataCallback(
const Names & column_names,
const ColumnsDescription & columns_description,
const SelectQueryInfo & query_info,
ContextPtr local_context,
QueryProcessingStage::Enum & /*processed_stage*/,
size_t /*max_block_size*/) const
{
String query = transformQueryForExternalDatabase(
query_info,
column_names,
columns_description.getOrdinary(),
bridge_helper->getIdentifierQuotingStyle(),
LiteralEscapingStyle::Regular,
remote_database_name,
remote_table_name,
local_context);
LOG_TRACE(log, "Query: {}", query);
NamesAndTypesList cols;
for (const String & name : column_names)
{
auto column_data = columns_description.getPhysical(name);
cols.emplace_back(column_data.name, column_data.type);
}
auto write_body_callback = [query, cols](std::ostream & os)
{
os << "sample_block=" << escapeForFileName(cols.toString());
os << "&";
os << "query=" << escapeForFileName(query);
};
return write_body_callback;
}
Pipe StorageXDBC::read(
const Names & column_names,
const StorageSnapshotPtr & storage_snapshot,
SelectQueryInfo & query_info,
ContextPtr local_context,
QueryProcessingStage::Enum processed_stage,
size_t max_block_size,
size_t num_streams)
{
storage_snapshot->check(column_names);
bridge_helper->startBridgeSync();
return IStorageURLBase::read(column_names, storage_snapshot, query_info, local_context, processed_stage, max_block_size, num_streams);
}
SinkToStoragePtr StorageXDBC::write(const ASTPtr & /* query */, const StorageMetadataPtr & metadata_snapshot, ContextPtr local_context, bool /*async_insert*/)
{
bridge_helper->startBridgeSync();
auto request_uri = Poco::URI(uri);
request_uri.setPath("/write");
auto url_params = bridge_helper->getURLParams(65536);
for (const auto & [param, value] : url_params)
request_uri.addQueryParameter(param, value);
request_uri.addQueryParameter("db_name", remote_database_name);
request_uri.addQueryParameter("table_name", remote_table_name);
request_uri.addQueryParameter("format_name", format_name);
request_uri.addQueryParameter("sample_block", metadata_snapshot->getSampleBlock().getNamesAndTypesList().toString());
return std::make_shared<StorageURLSink>(
request_uri.toString(),
format_name,
getFormatSettings(local_context),
metadata_snapshot->getSampleBlock(),
local_context,
ConnectionTimeouts::getHTTPTimeouts(
local_context->getSettingsRef(),
{local_context->getConfigRef().getUInt("keep_alive_timeout", DEFAULT_HTTP_KEEP_ALIVE_TIMEOUT), 0}),
compression_method);
}
bool StorageXDBC::supportsSubsetOfColumns(const ContextPtr &) const
{
return true;
}
Block StorageXDBC::getHeaderBlock(const Names & column_names, const StorageSnapshotPtr & storage_snapshot) const
{
return storage_snapshot->getSampleBlockForColumns(column_names);
}
std::string StorageXDBC::getName() const
{
return bridge_helper->getName();
}
namespace
{
template <typename BridgeHelperMixin>
void registerXDBCStorage(StorageFactory & factory, const std::string & name)
{
factory.registerStorage(name, [name](const StorageFactory::Arguments & args)
{
ASTs & engine_args = args.engine_args;
if (engine_args.size() != 3)
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
"Storage {} requires exactly 3 parameters: {}('DSN', database or schema, table)", name, name);
for (size_t i = 0; i < 3; ++i)
engine_args[i] = evaluateConstantExpressionOrIdentifierAsLiteral(engine_args[i], args.getLocalContext());
BridgeHelperPtr bridge_helper = std::make_shared<XDBCBridgeHelper<BridgeHelperMixin>>(args.getContext(),
args.getContext()->getSettingsRef().http_receive_timeout.value,
checkAndGetLiteralArgument<String>(engine_args[0], "connection_string"),
args.getContext()->getSettingsRef().odbc_bridge_use_connection_pooling.value);
return std::make_shared<StorageXDBC>(
args.table_id,
checkAndGetLiteralArgument<String>(engine_args[1], "database_name"),
checkAndGetLiteralArgument<String>(engine_args[2], "table_name"),
args.columns,
args.constraints,
args.comment,
args.getContext(),
bridge_helper);
},
{
.source_access_type = BridgeHelperMixin::getSourceAccessType(),
});
}
}
void registerStorageJDBC(StorageFactory & factory)
{
registerXDBCStorage<JDBCBridgeMixin>(factory, "JDBC");
}
void registerStorageODBC(StorageFactory & factory)
{
registerXDBCStorage<ODBCBridgeMixin>(factory, "ODBC");
}
}
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