mirror of
https://github.com/ClickHouse/ClickHouse.git
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47b995467e
Clickhouse-keeper: renames and comments
472 lines
15 KiB
C++
472 lines
15 KiB
C++
#include "Keeper.h"
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#include <sys/stat.h>
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#include <pwd.h>
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#include <Common/ClickHouseRevision.h>
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#include <Server/ProtocolServerAdapter.h>
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#include <Common/DNSResolver.h>
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#include <Interpreters/DNSCacheUpdater.h>
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#include <Poco/Net/NetException.h>
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#include <Poco/Net/TCPServerParams.h>
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#include <Poco/Net/TCPServer.h>
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#include <common/defines.h>
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#include <common/logger_useful.h>
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#include <common/ErrorHandlers.h>
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#include <common/scope_guard.h>
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#include <Poco/Util/HelpFormatter.h>
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#include <Poco/Version.h>
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#include <Poco/Environment.h>
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#include <Common/getMultipleKeysFromConfig.h>
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#include <Core/ServerUUID.h>
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#include <filesystem>
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#include <IO/UseSSL.h>
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#if !defined(ARCADIA_BUILD)
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# include "config_core.h"
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# include "Common/config_version.h"
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#endif
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#if USE_SSL
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# include <Poco/Net/Context.h>
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# include <Poco/Net/SecureServerSocket.h>
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#endif
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#include <Server/KeeperTCPHandlerFactory.h>
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#if defined(OS_LINUX)
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# include <unistd.h>
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# include <sys/syscall.h>
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#endif
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int mainEntryClickHouseKeeper(int argc, char ** argv)
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{
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DB::Keeper app;
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try
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{
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return app.run(argc, argv);
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}
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catch (...)
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{
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std::cerr << DB::getCurrentExceptionMessage(true) << "\n";
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auto code = DB::getCurrentExceptionCode();
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return code ? code : 1;
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}
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}
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int NO_ELEMENTS_IN_CONFIG;
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extern const int SUPPORT_IS_DISABLED;
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extern const int NETWORK_ERROR;
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extern const int MISMATCHING_USERS_FOR_PROCESS_AND_DATA;
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extern const int FAILED_TO_GETPWUID;
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}
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namespace
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{
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int waitServersToFinish(std::vector<DB::ProtocolServerAdapter> & servers, size_t seconds_to_wait)
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{
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const int sleep_max_ms = 1000 * seconds_to_wait;
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const int sleep_one_ms = 100;
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int sleep_current_ms = 0;
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int current_connections = 0;
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for (;;)
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{
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current_connections = 0;
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for (auto & server : servers)
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{
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server.stop();
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current_connections += server.currentConnections();
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}
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if (!current_connections)
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break;
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sleep_current_ms += sleep_one_ms;
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if (sleep_current_ms < sleep_max_ms)
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std::this_thread::sleep_for(std::chrono::milliseconds(sleep_one_ms));
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else
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break;
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}
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return current_connections;
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}
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Poco::Net::SocketAddress makeSocketAddress(const std::string & host, UInt16 port, Poco::Logger * log)
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{
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Poco::Net::SocketAddress socket_address;
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try
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{
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socket_address = Poco::Net::SocketAddress(host, port);
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}
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catch (const Poco::Net::DNSException & e)
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{
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const auto code = e.code();
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if (code == EAI_FAMILY
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#if defined(EAI_ADDRFAMILY)
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|| code == EAI_ADDRFAMILY
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#endif
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)
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{
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LOG_ERROR(log, "Cannot resolve listen_host ({}), error {}: {}. "
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"If it is an IPv6 address and your host has disabled IPv6, then consider to "
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"specify IPv4 address to listen in <listen_host> element of configuration "
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"file. Example: <listen_host>0.0.0.0</listen_host>",
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host, e.code(), e.message());
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}
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throw;
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}
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return socket_address;
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}
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[[noreturn]] void forceShutdown()
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{
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#if defined(THREAD_SANITIZER) && defined(OS_LINUX)
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/// Thread sanitizer tries to do something on exit that we don't need if we want to exit immediately,
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/// while connection handling threads are still run.
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(void)syscall(SYS_exit_group, 0);
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__builtin_unreachable();
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#else
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_exit(0);
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#endif
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}
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std::string getUserName(uid_t user_id)
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{
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/// Try to convert user id into user name.
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auto buffer_size = sysconf(_SC_GETPW_R_SIZE_MAX);
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if (buffer_size <= 0)
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buffer_size = 1024;
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std::string buffer;
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buffer.reserve(buffer_size);
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struct passwd passwd_entry;
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struct passwd * result = nullptr;
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const auto error = getpwuid_r(user_id, &passwd_entry, buffer.data(), buffer_size, &result);
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if (error)
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throwFromErrno("Failed to find user name for " + toString(user_id), ErrorCodes::FAILED_TO_GETPWUID, error);
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else if (result)
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return result->pw_name;
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return toString(user_id);
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}
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}
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Poco::Net::SocketAddress Keeper::socketBindListen(Poco::Net::ServerSocket & socket, const std::string & host, UInt16 port, [[maybe_unused]] bool secure) const
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{
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auto address = makeSocketAddress(host, port, &logger());
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#if !defined(POCO_CLICKHOUSE_PATCH) || POCO_VERSION < 0x01090100
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if (secure)
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/// Bug in old (<1.9.1) poco, listen() after bind() with reusePort param will fail because have no implementation in SecureServerSocketImpl
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/// https://github.com/pocoproject/poco/pull/2257
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socket.bind(address, /* reuseAddress = */ true);
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else
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#endif
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#if POCO_VERSION < 0x01080000
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socket.bind(address, /* reuseAddress = */ true);
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#else
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socket.bind(address, /* reuseAddress = */ true, /* reusePort = */ config().getBool("listen_reuse_port", false));
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#endif
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socket.listen(/* backlog = */ config().getUInt("listen_backlog", 64));
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return address;
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}
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void Keeper::createServer(const std::string & listen_host, const char * port_name, bool listen_try, CreateServerFunc && func) const
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{
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/// For testing purposes, user may omit tcp_port or http_port or https_port in configuration file.
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if (!config().has(port_name))
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return;
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auto port = config().getInt(port_name);
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try
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{
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func(port);
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}
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catch (const Poco::Exception &)
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{
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std::string message = "Listen [" + listen_host + "]:" + std::to_string(port) + " failed: " + getCurrentExceptionMessage(false);
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if (listen_try)
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{
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LOG_WARNING(&logger(), "{}. If it is an IPv6 or IPv4 address and your host has disabled IPv6 or IPv4, then consider to "
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"specify not disabled IPv4 or IPv6 address to listen in <listen_host> element of configuration "
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"file. Example for disabled IPv6: <listen_host>0.0.0.0</listen_host> ."
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" Example for disabled IPv4: <listen_host>::</listen_host>",
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message);
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}
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else
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{
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throw Exception{message, ErrorCodes::NETWORK_ERROR};
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}
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}
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}
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void Keeper::uninitialize()
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{
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logger().information("shutting down");
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BaseDaemon::uninitialize();
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}
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int Keeper::run()
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{
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if (config().hasOption("help"))
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{
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Poco::Util::HelpFormatter help_formatter(Keeper::options());
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auto header_str = fmt::format("{} [OPTION] [-- [ARG]...]\n"
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"positional arguments can be used to rewrite config.xml properties, for example, --http_port=8010",
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commandName());
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help_formatter.setHeader(header_str);
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help_formatter.format(std::cout);
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return 0;
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}
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if (config().hasOption("version"))
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{
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std::cout << DBMS_NAME << " keeper version " << VERSION_STRING << VERSION_OFFICIAL << "." << std::endl;
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return 0;
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}
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return Application::run(); // NOLINT
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}
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void Keeper::initialize(Poco::Util::Application & self)
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{
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BaseDaemon::initialize(self);
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logger().information("starting up");
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LOG_INFO(&logger(), "OS Name = {}, OS Version = {}, OS Architecture = {}",
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Poco::Environment::osName(),
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Poco::Environment::osVersion(),
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Poco::Environment::osArchitecture());
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}
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std::string Keeper::getDefaultConfigFileName() const
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{
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return "keeper_config.xml";
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}
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void Keeper::defineOptions(Poco::Util::OptionSet & options)
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{
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options.addOption(
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Poco::Util::Option("help", "h", "show help and exit")
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.required(false)
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.repeatable(false)
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.binding("help"));
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options.addOption(
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Poco::Util::Option("version", "V", "show version and exit")
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.required(false)
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.repeatable(false)
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.binding("version"));
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BaseDaemon::defineOptions(options);
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}
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int Keeper::main(const std::vector<std::string> & /*args*/)
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{
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Poco::Logger * log = &logger();
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UseSSL use_ssl;
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MainThreadStatus::getInstance();
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#if !defined(NDEBUG) || !defined(__OPTIMIZE__)
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LOG_WARNING(log, "Keeper was built in debug mode. It will work slowly.");
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#endif
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#if defined(SANITIZER)
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LOG_WARNING(log, "Keeper was built with sanitizer. It will work slowly.");
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#endif
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auto shared_context = Context::createShared();
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global_context = Context::createGlobal(shared_context.get());
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global_context->makeGlobalContext();
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global_context->setApplicationType(Context::ApplicationType::KEEPER);
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if (!config().has("keeper_server"))
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throw Exception(ErrorCodes::NO_ELEMENTS_IN_CONFIG, "Keeper configuration (<keeper_server> section) not found in config");
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std::string path;
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if (config().has("keeper_server.storage_path"))
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path = config().getString("keeper_server.storage_path");
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else if (config().has("keeper_server.log_storage_path"))
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path = std::filesystem::path(config().getString("keeper_server.log_storage_path")).parent_path();
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else if (config().has("keeper_server.snapshot_storage_path"))
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path = std::filesystem::path(config().getString("keeper_server.snapshot_storage_path")).parent_path();
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else
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path = std::filesystem::path{KEEPER_DEFAULT_PATH};
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/// Check that the process user id matches the owner of the data.
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const auto effective_user_id = geteuid();
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struct stat statbuf;
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if (stat(path.c_str(), &statbuf) == 0 && effective_user_id != statbuf.st_uid)
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{
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const auto effective_user = getUserName(effective_user_id);
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const auto data_owner = getUserName(statbuf.st_uid);
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std::string message = "Effective user of the process (" + effective_user +
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") does not match the owner of the data (" + data_owner + ").";
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if (effective_user_id == 0)
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{
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message += " Run under 'sudo -u " + data_owner + "'.";
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throw Exception(message, ErrorCodes::MISMATCHING_USERS_FOR_PROCESS_AND_DATA);
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}
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else
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{
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LOG_WARNING(log, message);
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}
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}
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DB::ServerUUID::load(path + "/uuid", log);
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const Settings & settings = global_context->getSettingsRef();
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GlobalThreadPool::initialize(config().getUInt("max_thread_pool_size", 100));
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static ServerErrorHandler error_handler;
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Poco::ErrorHandler::set(&error_handler);
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/// Initialize DateLUT early, to not interfere with running time of first query.
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LOG_DEBUG(log, "Initializing DateLUT.");
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DateLUT::instance();
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LOG_TRACE(log, "Initialized DateLUT with time zone '{}'.", DateLUT::instance().getTimeZone());
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/// Don't want to use DNS cache
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DNSResolver::instance().setDisableCacheFlag();
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Poco::ThreadPool server_pool(3, config().getUInt("max_connections", 1024));
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std::vector<std::string> listen_hosts = DB::getMultipleValuesFromConfig(config(), "", "listen_host");
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bool listen_try = config().getBool("listen_try", false);
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if (listen_hosts.empty())
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{
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listen_hosts.emplace_back("::1");
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listen_hosts.emplace_back("127.0.0.1");
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listen_try = true;
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}
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auto servers = std::make_shared<std::vector<ProtocolServerAdapter>>();
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/// Initialize test keeper RAFT. Do nothing if no nu_keeper_server in config.
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global_context->initializeKeeperDispatcher();
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for (const auto & listen_host : listen_hosts)
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{
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/// TCP Keeper
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const char * port_name = "keeper_server.tcp_port";
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createServer(listen_host, port_name, listen_try, [&](UInt16 port)
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{
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Poco::Net::ServerSocket socket;
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auto address = socketBindListen(socket, listen_host, port);
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socket.setReceiveTimeout(settings.receive_timeout);
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socket.setSendTimeout(settings.send_timeout);
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servers->emplace_back(
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port_name,
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std::make_unique<Poco::Net::TCPServer>(
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new KeeperTCPHandlerFactory(*this, false), server_pool, socket, new Poco::Net::TCPServerParams));
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LOG_INFO(log, "Listening for connections to Keeper (tcp): {}", address.toString());
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});
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const char * secure_port_name = "keeper_server.tcp_port_secure";
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createServer(listen_host, secure_port_name, listen_try, [&](UInt16 port)
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{
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#if USE_SSL
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Poco::Net::SecureServerSocket socket;
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auto address = socketBindListen(socket, listen_host, port, /* secure = */ true);
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socket.setReceiveTimeout(settings.receive_timeout);
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socket.setSendTimeout(settings.send_timeout);
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servers->emplace_back(
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secure_port_name,
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std::make_unique<Poco::Net::TCPServer>(
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new KeeperTCPHandlerFactory(*this, true), server_pool, socket, new Poco::Net::TCPServerParams));
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LOG_INFO(log, "Listening for connections to Keeper with secure protocol (tcp_secure): {}", address.toString());
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#else
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UNUSED(port);
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throw Exception{"SSL support for TCP protocol is disabled because Poco library was built without NetSSL support.",
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ErrorCodes::SUPPORT_IS_DISABLED};
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#endif
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});
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}
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for (auto & server : *servers)
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server.start();
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SCOPE_EXIT({
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LOG_INFO(log, "Shutting down.");
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global_context->shutdown();
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LOG_DEBUG(log, "Waiting for current connections to Keeper to finish.");
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int current_connections = 0;
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for (auto & server : *servers)
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{
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server.stop();
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current_connections += server.currentConnections();
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}
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if (current_connections)
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LOG_INFO(log, "Closed all listening sockets. Waiting for {} outstanding connections.", current_connections);
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else
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LOG_INFO(log, "Closed all listening sockets.");
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if (current_connections > 0)
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current_connections = waitServersToFinish(*servers, config().getInt("shutdown_wait_unfinished", 5));
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if (current_connections)
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LOG_INFO(log, "Closed connections to Keeper. But {} remain. Probably some users cannot finish their connections after context shutdown.", current_connections);
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else
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LOG_INFO(log, "Closed connections to Keeper.");
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global_context->shutdownKeeperDispatcher();
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/// Wait server pool to avoid use-after-free of destroyed context in the handlers
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server_pool.joinAll();
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/** Explicitly destroy Context. It is more convenient than in destructor of Server, because logger is still available.
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* At this moment, no one could own shared part of Context.
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*/
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global_context.reset();
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shared_context.reset();
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LOG_DEBUG(log, "Destroyed global context.");
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if (current_connections)
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{
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LOG_INFO(log, "Will shutdown forcefully.");
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forceShutdown();
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}
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});
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buildLoggers(config(), logger());
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LOG_INFO(log, "Ready for connections.");
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waitForTerminationRequest();
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return Application::EXIT_OK;
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}
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void Keeper::logRevision() const
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{
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Poco::Logger::root().information("Starting ClickHouse Keeper " + std::string{VERSION_STRING}
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+ " with revision " + std::to_string(ClickHouseRevision::getVersionRevision())
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+ ", " + build_id_info
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+ ", PID " + std::to_string(getpid()));
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}
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}
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