ClickHouse/src/Common/Exception.h
2020-06-07 20:29:34 +03:00

159 lines
4.8 KiB
C++

#pragma once
#include <cerrno>
#include <vector>
#include <memory>
#include <Poco/Exception.h>
#include <Common/StackTrace.h>
#include <fmt/format.h>
namespace Poco { class Logger; }
namespace DB
{
class Exception : public Poco::Exception
{
public:
Exception() = default;
Exception(const std::string & msg, int code);
// Format message with fmt::format, like the logging functions.
template <typename ...Fmt>
Exception(int code, Fmt&&... fmt)
: Exception(fmt::format(std::forward<Fmt>(fmt)...), code)
{}
struct CreateFromPocoTag {};
struct CreateFromSTDTag {};
Exception(CreateFromPocoTag, const Poco::Exception & exc);
Exception(CreateFromSTDTag, const std::exception & exc);
Exception * clone() const override { return new Exception(*this); }
void rethrow() const override { throw *this; }
const char * name() const throw() override { return "DB::Exception"; }
const char * what() const throw() override { return message().data(); }
/// Add something to the existing message.
void addMessage(const std::string & arg) { extendedMessage(arg); }
std::string getStackTraceString() const;
private:
#ifndef STD_EXCEPTION_HAS_STACK_TRACE
StackTrace trace;
#endif
const char * className() const throw() override { return "DB::Exception"; }
};
std::string getExceptionStackTraceString(const std::exception & e);
/// Contains an additional member `saved_errno`. See the throwFromErrno function.
class ErrnoException : public Exception
{
public:
ErrnoException(const std::string & msg, int code, int saved_errno_, const std::optional<std::string> & path_ = {})
: Exception(msg, code), saved_errno(saved_errno_), path(path_) {}
ErrnoException * clone() const override { return new ErrnoException(*this); }
void rethrow() const override { throw *this; }
int getErrno() const { return saved_errno; }
const std::optional<std::string> getPath() const { return path; }
private:
int saved_errno;
std::optional<std::string> path;
const char * name() const throw() override { return "DB::ErrnoException"; }
const char * className() const throw() override { return "DB::ErrnoException"; }
};
using Exceptions = std::vector<std::exception_ptr>;
[[noreturn]] void throwFromErrno(const std::string & s, int code, int the_errno = errno);
/// Useful to produce some extra information about available space and inodes on device
[[noreturn]] void throwFromErrnoWithPath(const std::string & s, const std::string & path, int code,
int the_errno = errno);
/** Try to write an exception to the log (and forget about it).
* Can be used in destructors in the catch-all block.
*/
void tryLogCurrentException(const char * log_name, const std::string & start_of_message = "");
void tryLogCurrentException(Poco::Logger * logger, const std::string & start_of_message = "");
/** Prints current exception in canonical format.
* with_stacktrace - prints stack trace for DB::Exception.
* check_embedded_stacktrace - if DB::Exception has embedded stacktrace then
* only this stack trace will be printed.
* with_extra_info - add information about the filesystem in case of "No space left on device" and similar.
*/
std::string getCurrentExceptionMessage(bool with_stacktrace, bool check_embedded_stacktrace = false,
bool with_extra_info = true);
/// Returns error code from ErrorCodes
int getCurrentExceptionCode();
/// An execution status of any piece of code, contains return code and optional error
struct ExecutionStatus
{
int code = 0;
std::string message;
ExecutionStatus() = default;
explicit ExecutionStatus(int return_code, const std::string & exception_message = "")
: code(return_code), message(exception_message) {}
static ExecutionStatus fromCurrentException(const std::string & start_of_message = "");
std::string serializeText() const;
void deserializeText(const std::string & data);
bool tryDeserializeText(const std::string & data);
};
void tryLogException(std::exception_ptr e, const char * log_name, const std::string & start_of_message = "");
void tryLogException(std::exception_ptr e, Poco::Logger * logger, const std::string & start_of_message = "");
std::string getExceptionMessage(const Exception & e, bool with_stacktrace, bool check_embedded_stacktrace = false);
std::string getExceptionMessage(std::exception_ptr e, bool with_stacktrace);
void rethrowFirstException(const Exceptions & exceptions);
template <typename T>
std::enable_if_t<std::is_pointer_v<T>, T> exception_cast(std::exception_ptr e)
{
try
{
std::rethrow_exception(std::move(e));
}
catch (std::remove_pointer_t<T> & concrete)
{
return &concrete;
}
catch (...)
{
return nullptr;
}
}
}