ClickHouse/programs/odbc-bridge/MainHandler.cpp

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#include "MainHandler.h"
#include "validateODBCConnectionString.h"
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#include "ODBCSource.h"
#include "ODBCSink.h"
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#include "getIdentifierQuote.h"
#include <DataTypes/DataTypeFactory.h>
#include <Formats/FormatFactory.h>
#include <Server/HTTP/WriteBufferFromHTTPServerResponse.h>
#include <IO/WriteHelpers.h>
#include <IO/ReadHelpers.h>
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#include <IO/ReadBufferFromIStream.h>
#include <Poco/Net/HTTPServerRequest.h>
#include <Poco/Net/HTTPServerResponse.h>
#include <Poco/Net/HTMLForm.h>
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#include <Poco/ThreadPool.h>
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#include <QueryPipeline/QueryPipeline.h>
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#include <Processors/Executors/CompletedPipelineExecutor.h>
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#include <Processors/Formats/IInputFormat.h>
#include <Common/BridgeProtocolVersion.h>
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#include <Common/logger_useful.h>
#include <Server/HTTP/HTMLForm.h>
#include "config.h"
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#include <mutex>
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#include <memory>
namespace DB
{
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namespace
{
std::unique_ptr<Block> parseColumns(std::string && column_string)
{
std::unique_ptr<Block> sample_block = std::make_unique<Block>();
auto names_and_types = NamesAndTypesList::parse(column_string);
for (const NameAndTypePair & column_data : names_and_types)
sample_block->insert({column_data.type, column_data.name});
return sample_block;
}
}
void ODBCHandler::processError(HTTPServerResponse & response, const std::string & message)
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{
response.setStatusAndReason(HTTPResponse::HTTP_INTERNAL_SERVER_ERROR);
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if (!response.sent())
*response.send() << message << '\n';
LOG_WARNING(log, fmt::runtime(message));
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}
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void ODBCHandler::handleRequest(HTTPServerRequest & request, HTTPServerResponse & response, const ProfileEvents::Event & /*write_event*/)
{
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HTMLForm params(getContext()->getSettingsRef(), request);
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LOG_TRACE(log, "Request URI: {}", request.getURI());
size_t version;
if (!params.has("version"))
version = 0; /// assumed version for too old servers which do not send a version
else
{
String version_str = params.get("version");
if (!tryParse(version, version_str))
{
processError(response, "Unable to parse 'version' string in request URL: '" + version_str + "' Check if the server and library-bridge have the same version.");
return;
}
}
if (version != XDBC_BRIDGE_PROTOCOL_VERSION)
{
/// backwards compatibility is considered unnecessary for now, just let the user know that the server and the bridge must be upgraded together
processError(response, "Server and library-bridge have different versions: '" + std::to_string(version) + "' vs. '" + std::to_string(LIBRARY_BRIDGE_PROTOCOL_VERSION) + "'");
return;
}
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if (mode == "read")
params.read(request.getStream());
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if (mode == "read" && !params.has("query"))
{
processError(response, "No 'query' in request body");
return;
}
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if (!params.has("connection_string"))
{
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processError(response, "No 'connection_string' in request URL");
return;
}
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if (!params.has("sample_block"))
{
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processError(response, "No 'sample_block' in request URL");
return;
}
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std::string format = params.get("format", "RowBinary");
std::string connection_string = params.get("connection_string");
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bool use_connection_pooling = params.getParsed<bool>("use_connection_pooling", true);
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LOG_TRACE(log, "Connection string: '{}'", connection_string);
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LOG_TRACE(log, "Use pooling: {}", use_connection_pooling);
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UInt64 max_block_size = DEFAULT_BLOCK_SIZE;
if (params.has("max_block_size"))
{
std::string max_block_size_str = params.get("max_block_size", "");
if (max_block_size_str.empty())
{
processError(response, "Empty max_block_size specified");
return;
}
max_block_size = parse<size_t>(max_block_size_str);
}
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std::string sample_block_string = params.get("sample_block");
std::unique_ptr<Block> sample_block;
try
{
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sample_block = parseColumns(std::move(sample_block_string));
}
catch (const Exception & ex)
{
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processError(response, "Invalid 'sample_block' parameter in request body '" + ex.message() + "'");
LOG_ERROR(log, fmt::runtime(ex.getStackTraceString()));
return;
}
WriteBufferFromHTTPServerResponse out(response, request.getMethod() == Poco::Net::HTTPRequest::HTTP_HEAD, keep_alive_timeout);
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try
{
nanodbc::ConnectionHolderPtr connection_handler;
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if (use_connection_pooling)
connection_handler = ODBCPooledConnectionFactory::instance().get(
validateODBCConnectionString(connection_string), getContext()->getSettingsRef().odbc_bridge_connection_pool_size);
else
connection_handler = std::make_shared<nanodbc::ConnectionHolder>(validateODBCConnectionString(connection_string));
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if (mode == "write")
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{
if (!params.has("db_name"))
{
processError(response, "No 'db_name' in request URL");
return;
}
if (!params.has("table_name"))
{
processError(response, "No 'table_name' in request URL");
return;
}
std::string db_name = params.get("db_name");
std::string table_name = params.get("table_name");
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LOG_TRACE(log, "DB name: '{}', table name: '{}'", db_name, table_name);
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auto quoting_style = IdentifierQuotingStyle::None;
#if USE_ODBC
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quoting_style = getQuotingStyle(connection_handler);
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#endif
auto & read_buf = request.getStream();
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auto input_format = getContext()->getInputFormat(format, read_buf, *sample_block, max_block_size);
auto sink = std::make_shared<ODBCSink>(std::move(connection_handler), db_name, table_name, *sample_block, getContext(), quoting_style);
QueryPipeline pipeline(std::move(input_format));
pipeline.complete(std::move(sink));
CompletedPipelineExecutor executor(pipeline);
executor.execute();
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writeStringBinary("Ok.", out);
}
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else
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{
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std::string query = params.get("query");
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LOG_TRACE(log, "Query: {}", query);
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auto writer = FormatFactory::instance().getOutputFormatParallelIfPossible(format, out, *sample_block, getContext());
auto source = std::make_shared<ODBCSource>(std::move(connection_handler), query, *sample_block, max_block_size);
QueryPipeline pipeline(std::move(source));
pipeline.complete(std::move(writer));
CompletedPipelineExecutor executor(pipeline);
executor.execute();
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}
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}
catch (...)
{
auto message = getCurrentExceptionMessage(true);
response.setStatusAndReason(
Poco::Net::HTTPResponse::HTTP_INTERNAL_SERVER_ERROR); // can't call process_error, because of too soon response sending
try
{
writeStringBinary(message, out);
out.finalize();
}
catch (...)
{
tryLogCurrentException(log);
}
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tryLogCurrentException(log);
}
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try
{
out.finalize();
}
catch (...)
{
tryLogCurrentException(log);
}
}
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}