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https://github.com/ClickHouse/ClickHouse.git
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128 lines
4.0 KiB
C++
128 lines
4.0 KiB
C++
#include "MainHandler.h"
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#include "validateODBCConnectionString.h"
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#include <memory>
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#include <DataStreams/copyData.h>
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#include <DataTypes/DataTypeFactory.h>
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#include <Dictionaries/ODBCBlockInputStream.h>
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#include <Formats/BinaryRowInputStream.h>
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#include <Formats/FormatFactory.h>
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#include <IO/WriteBufferFromHTTPServerResponse.h>
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#include <IO/WriteHelpers.h>
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#include <Interpreters/Context.h>
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#include <Poco/Ext/SessionPoolHelpers.h>
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#include <Poco/Net/HTTPServerRequest.h>
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#include <Poco/Net/HTTPServerResponse.h>
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#include <Common/HTMLForm.h>
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#include <common/logger_useful.h>
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namespace DB
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{
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namespace
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{
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std::unique_ptr<Block> parseColumns(std::string && column_string)
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{
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std::unique_ptr<Block> sample_block = std::make_unique<Block>();
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auto names_and_types = NamesAndTypesList::parse(column_string);
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for (const NameAndTypePair & column_data : names_and_types)
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sample_block->insert({column_data.type, column_data.name});
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return sample_block;
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}
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}
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ODBCHandler::PoolPtr ODBCHandler::getPool(const std::string & connection_str)
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{
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std::lock_guard lock(mutex);
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if (!pool_map->count(connection_str))
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{
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pool_map->emplace(connection_str, createAndCheckResizePocoSessionPool([connection_str] {
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return std::make_shared<Poco::Data::SessionPool>("ODBC", validateODBCConnectionString(connection_str));
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}));
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}
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return pool_map->at(connection_str);
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}
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void ODBCHandler::handleRequest(Poco::Net::HTTPServerRequest & request, Poco::Net::HTTPServerResponse & response)
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{
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Poco::Net::HTMLForm params(request, request.stream());
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LOG_TRACE(log, "Request URI: " + request.getURI());
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auto process_error = [&response, this](const std::string & message)
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{
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response.setStatusAndReason(Poco::Net::HTTPResponse::HTTP_INTERNAL_SERVER_ERROR);
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if (!response.sent())
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response.send() << message << std::endl;
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LOG_WARNING(log, message);
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};
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if (!params.has("query"))
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{
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process_error("No 'query' in request body");
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return;
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}
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if (!params.has("columns"))
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{
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process_error("No 'columns' in request URL");
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return;
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}
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if (!params.has("connection_string"))
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{
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process_error("No 'connection_string' in request URL");
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return;
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}
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size_t max_block_size = DEFAULT_BLOCK_SIZE;
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if (params.has("max_block_size"))
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{
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std::string max_block_size_str = params.get("max_block_size", "");
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if (max_block_size_str.empty())
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{
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process_error("Empty max_block_size specified");
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return;
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}
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max_block_size = parse<size_t>(max_block_size_str);
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}
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std::string columns = params.get("columns");
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std::unique_ptr<Block> sample_block;
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try
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{
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sample_block = parseColumns(std::move(columns));
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}
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catch (const Exception & ex)
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{
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process_error("Invalid 'columns' parameter in request body '" + ex.message() + "'");
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LOG_WARNING(log, ex.getStackTrace().toString());
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return;
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}
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std::string format = params.get("format", "RowBinary");
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std::string query = params.get("query");
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LOG_TRACE(log, "Query: " << query);
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std::string connection_string = params.get("connection_string");
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LOG_TRACE(log, "Connection string: '" << connection_string << "'");
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WriteBufferFromHTTPServerResponse out(request, response, keep_alive_timeout);
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try
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{
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BlockOutputStreamPtr writer = FormatFactory::instance().getOutput(format, out, *sample_block, *context);
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auto pool = getPool(connection_string);
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ODBCBlockInputStream inp(pool->get(), query, *sample_block, max_block_size);
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copyData(inp, *writer);
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}
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catch (...)
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{
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auto message = getCurrentExceptionMessage(true);
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response.setStatusAndReason(
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Poco::Net::HTTPResponse::HTTP_INTERNAL_SERVER_ERROR); // can't call process_error, bacause of too soon response sending
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writeStringBinary(message, out);
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tryLogCurrentException(log);
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}
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}
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}
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