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#include <boost/program_options.hpp>
#include <DataTypes/DataTypeFactory.h>
#include <Storages/IStorage.h>
#include <Storages/ColumnsDescription.h>
#include <Storages/ConstraintsDescription.h>
#include <Interpreters/Context.h>
#include <Interpreters/DatabaseCatalog.h>
#include <IO/ReadBufferFromFile.h>
#include <IO/LimitReadBuffer.h>
#include <QueryPipeline/Pipe.h>
#include <Processors/Executors/PipelineExecutor.h>
#include <Processors/Sinks/SinkToStorage.h>
#include <Processors/Executors/CompletedPipelineExecutor.h>
#include <Processors/Formats/IInputFormat.h>
#include <QueryPipeline/QueryPipelineBuilder.h>
#include <Core/ExternalTable.h>
#include <Poco/Net/MessageHeader.h>
#include <base/scope_guard.h>
namespace DB
{
namespace ErrorCodes
{
extern const int BAD_ARGUMENTS;
}
ExternalTableDataPtr BaseExternalTable::getData(ContextPtr context)
{
initReadBuffer();
initSampleBlock();
auto input = context->getInputFormat(format, *read_buffer, sample_block, context->getSettingsRef().get("max_block_size").get<UInt64>());
auto data = std::make_unique<ExternalTableData>();
data->pipe = std::make_unique<QueryPipelineBuilder>();
data->pipe->init(Pipe(std::move(input)));
data->table_name = name;
return data;
}
void BaseExternalTable::clear()
{
name.clear();
file.clear();
format.clear();
structure.clear();
sample_block.clear();
read_buffer.reset();
}
void BaseExternalTable::parseStructureFromStructureField(const std::string & argument)
{
std::vector<std::string> vals;
splitInto<' ', ','>(vals, argument, true);
if (vals.size() % 2 != 0)
throw Exception(ErrorCodes::BAD_ARGUMENTS, "Odd number of attributes in section structure: {}", vals.size());
for (size_t i = 0; i < vals.size(); i += 2)
structure.emplace_back(vals[i], vals[i + 1]);
}
void BaseExternalTable::parseStructureFromTypesField(const std::string & argument)
{
std::vector<std::string> vals;
splitInto<' ', ','>(vals, argument, true);
for (size_t i = 0; i < vals.size(); ++i)
structure.emplace_back("_" + toString(i + 1), vals[i]);
}
void BaseExternalTable::initSampleBlock()
{
const DataTypeFactory & data_type_factory = DataTypeFactory::instance();
for (const auto & elem : structure)
{
ColumnWithTypeAndName column;
column.name = elem.first;
column.type = data_type_factory.get(elem.second);
column.column = column.type->createColumn();
sample_block.insert(std::move(column));
}
}
void ExternalTable::initReadBuffer()
{
if (file == "-")
read_buffer = std::make_unique<ReadBufferFromFileDescriptor>(STDIN_FILENO);
else
read_buffer = std::make_unique<ReadBufferFromFile>(file);
}
ExternalTable::ExternalTable(const boost::program_options::variables_map & external_options)
{
if (external_options.count("file"))
file = external_options["file"].as<std::string>();
else
throw Exception(ErrorCodes::BAD_ARGUMENTS, "--file field have not been provided for external table");
if (external_options.count("name"))
name = external_options["name"].as<std::string>();
else
throw Exception(ErrorCodes::BAD_ARGUMENTS, "--name field have not been provided for external table");
if (external_options.count("format"))
format = external_options["format"].as<std::string>();
else
throw Exception(ErrorCodes::BAD_ARGUMENTS, "--format field have not been provided for external table");
if (external_options.count("structure"))
parseStructureFromStructureField(external_options["structure"].as<std::string>());
else if (external_options.count("types"))
parseStructureFromTypesField(external_options["types"].as<std::string>());
else
throw Exception(ErrorCodes::BAD_ARGUMENTS, "Neither --structure nor --types have not been provided for external table");
}
void ExternalTablesHandler::handlePart(const Poco::Net::MessageHeader & header, ReadBuffer & stream)
{
/// After finishing this function we will be ready to receive the next file, for this we clear all the information received.
/// We should use SCOPE_EXIT because read_buffer should be reset correctly if there will be an exception.
SCOPE_EXIT(clear());
const Settings & settings = getContext()->getSettingsRef();
if (settings.http_max_multipart_form_data_size)
read_buffer = std::make_unique<LimitReadBuffer>(
stream, settings.http_max_multipart_form_data_size,
/* trow_exception */ true, /* exact_limit */ std::optional<size_t>(),
"the maximum size of multipart/form-data. "
"This limit can be tuned by 'http_max_multipart_form_data_size' setting");
else
read_buffer = wrapReadBufferReference(stream);
/// Retrieve a collection of parameters from MessageHeader
Poco::Net::NameValueCollection content;
std::string label;
Poco::Net::MessageHeader::splitParameters(header.get("Content-Disposition"), label, content);
/// Get parameters
name = content.get("name", "_data");
format = params.get(name + "_format", "TabSeparated");
if (params.has(name + "_structure"))
parseStructureFromStructureField(params.get(name + "_structure"));
else if (params.has(name + "_types"))
parseStructureFromTypesField(params.get(name + "_types"));
else
throw Exception(ErrorCodes::BAD_ARGUMENTS,
"Neither structure nor types have not been provided for external table {}. "
"Use fields {}_structure or {}_types to do so.", name, name, name);
ExternalTableDataPtr data = getData(getContext());
/// Create table
NamesAndTypesList columns = sample_block.getNamesAndTypesList();
auto temporary_table = TemporaryTableHolder(getContext(), ColumnsDescription{columns}, {});
auto storage = temporary_table.getTable();
getContext()->addExternalTable(data->table_name, std::move(temporary_table));
auto sink = storage->write(ASTPtr(), storage->getInMemoryMetadataPtr(), getContext(), /*async_insert=*/false);
/// Write data
auto pipeline = QueryPipelineBuilder::getPipeline(std::move(*data->pipe));
pipeline.complete(std::move(sink));
pipeline.setNumThreads(1);
CompletedPipelineExecutor executor(pipeline);
executor.execute();
}
}
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