ClickHouse/dbms/programs/odbc-bridge/ODBCBridge.cpp

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#include "ODBCBridge.h"
#include "HandlerFactory.h"
#include <string>
#include <errno.h>
#include <IO/ReadHelpers.h>
#include <boost/program_options.hpp>
#include <Poco/Net/HTTPServer.h>
#include <Poco/Net/NetException.h>
#include <Poco/String.h>
#include <Poco/Util/HelpFormatter.h>
#include <Common/Exception.h>
#include <Common/StringUtils/StringUtils.h>
#include <Common/config.h>
#include <common/logger_useful.h>
#include <ext/scope_guard.h>
#include <ext/range.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ARGUMENT_OUT_OF_BOUND;
}
namespace
{
Poco::Net::SocketAddress makeSocketAddress(const std::string & host, UInt16 port, Poco::Logger * log)
{
Poco::Net::SocketAddress socket_address;
try
{
socket_address = Poco::Net::SocketAddress(host, port);
}
catch (const Poco::Net::DNSException & e)
{
const auto code = e.code();
if (code == EAI_FAMILY
#if defined(EAI_ADDRFAMILY)
|| code == EAI_ADDRFAMILY
#endif
)
{
LOG_ERROR(log,
"Cannot resolve listen_host (" << host << "), error " << e.code() << ": " << e.message()
<< ". "
"If it is an IPv6 address and your host has disabled IPv6, then consider to "
"specify IPv4 address to listen in <listen_host> element of configuration "
"file. Example: <listen_host>0.0.0.0</listen_host>");
}
throw;
}
return socket_address;
}
Poco::Net::SocketAddress socketBindListen(Poco::Net::ServerSocket & socket, const std::string & host, UInt16 port, Poco::Logger * log)
{
auto address = makeSocketAddress(host, port, log);
#if POCO_VERSION < 0x01080000
socket.bind(address, /* reuseAddress = */ true);
#else
socket.bind(address, /* reuseAddress = */ true, /* reusePort = */ false);
#endif
socket.listen(/* backlog = */ 64);
return address;
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}
}
void ODBCBridge::handleHelp(const std::string &, const std::string &)
{
Poco::Util::HelpFormatter helpFormatter(options());
helpFormatter.setCommand(commandName());
helpFormatter.setHeader("HTTP-proxy for odbc requests");
helpFormatter.setUsage("--http-port <port>");
helpFormatter.format(std::cerr);
stopOptionsProcessing();
}
void ODBCBridge::defineOptions(Poco::Util::OptionSet & options)
{
options.addOption(Poco::Util::Option("http-port", "", "port to listen").argument("http-port", true).binding("http-port"));
options.addOption(
Poco::Util::Option("listen-host", "", "hostname to listen, default localhost").argument("listen-host").binding("listen-host"));
options.addOption(
Poco::Util::Option("http-timeout", "", "http timout for socket, default 1800").argument("http-timeout").binding("http-timeout"));
options.addOption(Poco::Util::Option("max-server-connections", "", "max connections to server, default 1024")
.argument("max-server-connections")
.binding("max-server-connections"));
options.addOption(Poco::Util::Option("keep-alive-timeout", "", "keepalive timeout, default 10")
.argument("keep-alive-timeout")
.binding("keep-alive-timeout"));
options.addOption(Poco::Util::Option("log-level", "", "sets log level, default info").argument("log-level").binding("logger.level"));
options.addOption(
Poco::Util::Option("log-path", "", "log path for all logs, default console").argument("log-path").binding("logger.log"));
options.addOption(Poco::Util::Option("err-log-path", "", "err log path for all logs, default no")
.argument("err-log-path")
.binding("logger.errorlog"));
using Me = std::decay_t<decltype(*this)>;
options.addOption(Poco::Util::Option("help", "", "produce this help message")
.binding("help")
.callback(Poco::Util::OptionCallback<Me>(this, &Me::handleHelp)));
ServerApplication::defineOptions(options); /// Don't need complex BaseDaemon's .xml config
}
void ODBCBridge::initialize(Application & self)
{
BaseDaemon::closeFDs();
is_help = config().has("help");
if (is_help)
return;
if (!config().has("logger.log"))
config().setBool("logger.console", true);
config().setString("logger", "ODBCBridge");
buildLoggers(config());
log = &logger();
hostname = config().getString("listen-host", "localhost");
port = config().getUInt("http-port");
if (port > 0xFFFF)
throw Exception("Out of range 'http-port': " + std::to_string(port), ErrorCodes::ARGUMENT_OUT_OF_BOUND);
http_timeout = config().getUInt("http-timeout", DEFAULT_HTTP_READ_BUFFER_TIMEOUT);
max_server_connections = config().getUInt("max-server-connections", 1024);
keep_alive_timeout = config().getUInt("keep-alive-timeout", 10);
initializeTerminationAndSignalProcessing();
ServerApplication::initialize(self);
}
void ODBCBridge::uninitialize()
{
BaseDaemon::uninitialize();
}
int ODBCBridge::main(const std::vector<std::string> & /*args*/)
{
if (is_help)
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return Application::EXIT_OK;
LOG_INFO(log, "Starting up");
Poco::Net::ServerSocket socket;
auto address = socketBindListen(socket, hostname, port, log);
socket.setReceiveTimeout(http_timeout);
socket.setSendTimeout(http_timeout);
Poco::ThreadPool server_pool(3, max_server_connections);
Poco::Net::HTTPServerParams::Ptr http_params = new Poco::Net::HTTPServerParams;
http_params->setTimeout(http_timeout);
http_params->setKeepAliveTimeout(keep_alive_timeout);
context = std::make_shared<Context>(Context::createGlobal());
context->setGlobalContext(*context);
auto server = Poco::Net::HTTPServer(
new HandlerFactory("ODBCRequestHandlerFactory-factory", keep_alive_timeout, context), server_pool, socket, http_params);
server.start();
LOG_INFO(log, "Listening http://" + address.toString());
SCOPE_EXIT({
LOG_DEBUG(log, "Received termination signal.");
LOG_DEBUG(log, "Waiting for current connections to close.");
server.stop();
for (size_t count : ext::range(1, 6))
{
if (server.currentConnections() == 0)
break;
LOG_DEBUG(log, "Waiting for " << server.currentConnections() << " connections, try " << count);
std::this_thread::sleep_for(std::chrono::milliseconds(1000));
}
});
waitForTerminationRequest();
return Application::EXIT_OK;
}
}
int mainEntryClickHouseODBCBridge(int argc, char ** argv)
{
DB::ODBCBridge app;
try
{
return app.run(argc, argv);
}
catch (...)
{
std::cerr << DB::getCurrentExceptionMessage(true) << "\n";
auto code = DB::getCurrentExceptionCode();
return code ? code : 1;
}
}