ClickHouse/programs/main.cpp

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#include <signal.h>
#include <setjmp.h>
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#include <unistd.h>
#include <new>
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#include <iostream>
#include <vector>
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#include <string>
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#include <utility> /// pair
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#if !defined(ARCADIA_BUILD)
# include "config_tools.h"
#endif
#include <Common/StringUtils/StringUtils.h>
#include <common/phdr_cache.h>
#include <ext/scope_guard.h>
/// Universal executable for various clickhouse applications
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#if ENABLE_CLICKHOUSE_SERVER
int mainEntryClickHouseServer(int argc, char ** argv);
#endif
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#if ENABLE_CLICKHOUSE_CLIENT
int mainEntryClickHouseClient(int argc, char ** argv);
#endif
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#if ENABLE_CLICKHOUSE_LOCAL
int mainEntryClickHouseLocal(int argc, char ** argv);
#endif
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#if ENABLE_CLICKHOUSE_BENCHMARK
int mainEntryClickHouseBenchmark(int argc, char ** argv);
#endif
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#if ENABLE_CLICKHOUSE_EXTRACT_FROM_CONFIG
int mainEntryClickHouseExtractFromConfig(int argc, char ** argv);
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#endif
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#if ENABLE_CLICKHOUSE_COMPRESSOR
int mainEntryClickHouseCompressor(int argc, char ** argv);
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#endif
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#if ENABLE_CLICKHOUSE_FORMAT
int mainEntryClickHouseFormat(int argc, char ** argv);
#endif
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#if ENABLE_CLICKHOUSE_COPIER
int mainEntryClickHouseClusterCopier(int argc, char ** argv);
#endif
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#if ENABLE_CLICKHOUSE_OBFUSCATOR
int mainEntryClickHouseObfuscator(int argc, char ** argv);
#endif
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#if ENABLE_CLICKHOUSE_INSTALL
int mainEntryClickHouseInstall(int argc, char ** argv);
int mainEntryClickHouseStart(int argc, char ** argv);
int mainEntryClickHouseStop(int argc, char ** argv);
int mainEntryClickHouseStatus(int argc, char ** argv);
int mainEntryClickHouseRestart(int argc, char ** argv);
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#endif
namespace
{
using MainFunc = int (*)(int, char**);
/// Add an item here to register new application
std::pair<const char *, MainFunc> clickhouse_applications[] =
{
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#if ENABLE_CLICKHOUSE_LOCAL
{"local", mainEntryClickHouseLocal},
#endif
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#if ENABLE_CLICKHOUSE_CLIENT
{"client", mainEntryClickHouseClient},
#endif
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#if ENABLE_CLICKHOUSE_BENCHMARK
{"benchmark", mainEntryClickHouseBenchmark},
#endif
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#if ENABLE_CLICKHOUSE_SERVER
{"server", mainEntryClickHouseServer},
#endif
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#if ENABLE_CLICKHOUSE_EXTRACT_FROM_CONFIG
{"extract-from-config", mainEntryClickHouseExtractFromConfig},
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#endif
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#if ENABLE_CLICKHOUSE_COMPRESSOR
{"compressor", mainEntryClickHouseCompressor},
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#endif
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#if ENABLE_CLICKHOUSE_FORMAT
{"format", mainEntryClickHouseFormat},
#endif
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#if ENABLE_CLICKHOUSE_COPIER
{"copier", mainEntryClickHouseClusterCopier},
#endif
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#if ENABLE_CLICKHOUSE_OBFUSCATOR
{"obfuscator", mainEntryClickHouseObfuscator},
#endif
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#if ENABLE_CLICKHOUSE_INSTALL
{"install", mainEntryClickHouseInstall},
{"start", mainEntryClickHouseStart},
{"stop", mainEntryClickHouseStop},
{"status", mainEntryClickHouseStatus},
{"restart", mainEntryClickHouseRestart},
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#endif
};
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int printHelp(int, char **)
{
std::cerr << "Use one of the following commands:" << std::endl;
for (auto & application : clickhouse_applications)
std::cerr << "clickhouse " << application.first << " [args] " << std::endl;
return -1;
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}
bool isClickhouseApp(const std::string & app_suffix, std::vector<char *> & argv)
{
/// Use app if the first arg 'app' is passed (the arg should be quietly removed)
if (argv.size() >= 2)
{
auto first_arg = argv.begin() + 1;
/// 'clickhouse --client ...' and 'clickhouse client ...' are Ok
if (*first_arg == "--" + app_suffix || *first_arg == app_suffix)
{
argv.erase(first_arg);
return true;
}
}
/// Use app if clickhouse binary is run through symbolic link with name clickhouse-app
std::string app_name = "clickhouse-" + app_suffix;
return !argv.empty() && (app_name == argv[0] || endsWith(argv[0], "/" + app_name));
}
enum class InstructionFail
{
NONE = 0,
SSE3 = 1,
SSSE3 = 2,
SSE4_1 = 3,
SSE4_2 = 4,
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POPCNT = 5,
AVX = 6,
AVX2 = 7,
AVX512 = 8
};
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const char * instructionFailToString(InstructionFail fail)
{
switch (fail)
{
case InstructionFail::NONE:
return "NONE";
case InstructionFail::SSE3:
return "SSE3";
case InstructionFail::SSSE3:
return "SSSE3";
case InstructionFail::SSE4_1:
return "SSE4.1";
case InstructionFail::SSE4_2:
return "SSE4.2";
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case InstructionFail::POPCNT:
return "POPCNT";
case InstructionFail::AVX:
return "AVX";
case InstructionFail::AVX2:
return "AVX2";
case InstructionFail::AVX512:
return "AVX512";
}
__builtin_unreachable();
}
sigjmp_buf jmpbuf;
[[noreturn]] void sigIllCheckHandler(int, siginfo_t *, void *)
{
siglongjmp(jmpbuf, 1);
}
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/// Check if necessary SSE extensions are available by trying to execute some sse instructions.
/// If instruction is unavailable, SIGILL will be sent by kernel.
void checkRequiredInstructionsImpl(volatile InstructionFail & fail)
{
#if defined(__SSE3__)
fail = InstructionFail::SSE3;
__asm__ volatile ("addsubpd %%xmm0, %%xmm0" : : : "xmm0");
#endif
#if defined(__SSSE3__)
fail = InstructionFail::SSSE3;
__asm__ volatile ("pabsw %%xmm0, %%xmm0" : : : "xmm0");
#endif
#if defined(__SSE4_1__)
fail = InstructionFail::SSE4_1;
__asm__ volatile ("pmaxud %%xmm0, %%xmm0" : : : "xmm0");
#endif
#if defined(__SSE4_2__)
fail = InstructionFail::SSE4_2;
__asm__ volatile ("pcmpgtq %%xmm0, %%xmm0" : : : "xmm0");
#endif
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/// Defined by -msse4.2
#if defined(__POPCNT__)
fail = InstructionFail::POPCNT;
{
uint64_t a = 0;
uint64_t b = 0;
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__asm__ volatile ("popcnt %1, %0" : "=r"(a) :"r"(b) :);
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}
#endif
#if defined(__AVX__)
fail = InstructionFail::AVX;
__asm__ volatile ("vaddpd %%ymm0, %%ymm0, %%ymm0" : : : "ymm0");
#endif
#if defined(__AVX2__)
fail = InstructionFail::AVX2;
__asm__ volatile ("vpabsw %%ymm0, %%ymm0" : : : "ymm0");
#endif
#if defined(__AVX512__)
fail = InstructionFail::AVX512;
__asm__ volatile ("vpabsw %%zmm0, %%zmm0" : : : "zmm0");
#endif
fail = InstructionFail::NONE;
}
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/// This function is safe to use in static initializers.
void writeError(const char * data, size_t size)
{
while (size != 0)
{
ssize_t res = ::write(STDERR_FILENO, data, size);
if ((-1 == res || 0 == res) && errno != EINTR)
_Exit(1);
if (res > 0)
{
data += res;
size -= res;
}
}
}
/// Check SSE and others instructions availability. Calls exit on fail.
/// This function must be called as early as possible, even before main, because static initializers may use unavailable instructions.
void checkRequiredInstructions()
{
struct sigaction sa{};
struct sigaction sa_old{};
sa.sa_sigaction = sigIllCheckHandler;
sa.sa_flags = SA_SIGINFO;
auto signal = SIGILL;
if (sigemptyset(&sa.sa_mask) != 0
|| sigaddset(&sa.sa_mask, signal) != 0
|| sigaction(signal, &sa, &sa_old) != 0)
{
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/// You may wonder about strlen.
/// Typical implementation of strlen is using SSE4.2 or AVX2.
/// But this is not the case because it's compiler builtin and is executed at compile time.
const char * msg = "Can not set signal handler\n";
writeError(msg, strlen(msg));
_Exit(1);
}
volatile InstructionFail fail = InstructionFail::NONE;
if (sigsetjmp(jmpbuf, 1))
{
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const char * msg1 = "Instruction check fail. The CPU does not support ";
writeError(msg1, strlen(msg1));
const char * msg2 = instructionFailToString(fail);
writeError(msg2, strlen(msg2));
const char * msg3 = " instruction set.\n";
writeError(msg3, strlen(msg3));
_Exit(1);
}
checkRequiredInstructionsImpl(fail);
if (sigaction(signal, &sa_old, nullptr))
{
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const char * msg = "Can not set signal handler\n";
writeError(msg, strlen(msg));
_Exit(1);
}
}
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struct Checker { Checker() { checkRequiredInstructions(); } } checker;
}
/// This allows to implement assert to forbid initialization of a class in static constructors.
/// Usage:
///
/// extern bool inside_main;
/// class C { C() { assert(inside_main); } };
bool inside_main = false;
int main(int argc_, char ** argv_)
{
inside_main = true;
SCOPE_EXIT({ inside_main = false; });
/// Reset new handler to default (that throws std::bad_alloc)
/// It is needed because LLVM library clobbers it.
std::set_new_handler(nullptr);
/// PHDR cache is required for query profiler to work reliably
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/// It also speed up exception handling, but exceptions from dynamically loaded libraries (dlopen)
/// will work only after additional call of this function.
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updatePHDRCache();
std::vector<char *> argv(argv_, argv_ + argc_);
/// Print a basic help if nothing was matched
MainFunc main_func = printHelp;
for (auto & application : clickhouse_applications)
{
if (isClickhouseApp(application.first, argv))
{
main_func = application.second;
break;
}
}
return main_func(static_cast<int>(argv.size()), argv.data());
}