ClickHouse/dbms/include/DB/Common/Exception.h

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#pragma once
#include <cerrno>
#include <vector>
#include <memory>
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#include <Poco/Exception.h>
#include <DB/Common/StackTrace.h>
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namespace Poco { class Logger; }
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namespace DB
{
class Exception : public Poco::Exception
{
public:
Exception(int code = 0) : Poco::Exception(code) {}
Exception(const std::string & msg, int code = 0) : Poco::Exception(msg, code) {}
Exception(const std::string & msg, const std::string & arg, int code = 0) : Poco::Exception(msg, arg, code) {}
Exception(const std::string & msg, const Exception & exc, int code = 0) : Poco::Exception(msg, exc, code), trace(exc.trace) {}
Exception(const Exception & exc) : Poco::Exception(exc), trace(exc.trace) {}
explicit Exception(const Poco::Exception & exc) : Poco::Exception(exc.displayText()) {}
~Exception() throw() override {}
Exception & operator = (const Exception & exc)
{
Poco::Exception::operator=(exc);
trace = exc.trace;
return *this;
}
const char * name() const throw() override { return "DB::Exception"; }
const char * className() const throw() override { return "DB::Exception"; }
DB::Exception * clone() const override { return new DB::Exception(*this); }
void rethrow() const override { throw *this; }
/// Дописать к существующему сообщению что-нибудь ещё.
void addMessage(const std::string & arg) { extendedMessage(arg); }
const StackTrace & getStackTrace() const { return trace; }
private:
StackTrace trace;
};
/// Содержит дополнительный член saved_errno. См. функцию throwFromErrno.
class ErrnoException : public Exception
{
public:
ErrnoException(int code = 0, int saved_errno_ = 0)
: Exception(code), saved_errno(saved_errno_) {}
ErrnoException(const std::string & msg, int code = 0, int saved_errno_ = 0)
: Exception(msg, code), saved_errno(saved_errno_) {}
ErrnoException(const std::string & msg, const std::string & arg, int code = 0, int saved_errno_ = 0)
: Exception(msg, arg, code), saved_errno(saved_errno_) {}
ErrnoException(const std::string & msg, const Exception & exc, int code = 0, int saved_errno_ = 0)
: Exception(msg, exc, code), saved_errno(saved_errno_) {}
ErrnoException(const ErrnoException & exc)
: Exception(exc), saved_errno(exc.saved_errno) {}
int getErrno() const { return saved_errno; }
private:
int saved_errno;
};
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using Exceptions = std::vector<std::exception_ptr>;
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void throwFromErrno(const std::string & s, int code = 0, int the_errno = errno);
/** Попробовать записать исключение в лог (и забыть про него).
* Можно использовать в деструкторах в блоке catch (...).
*/
void tryLogCurrentException(const char * log_name, const std::string & start_of_message = "");
void tryLogCurrentException(Poco::Logger * logger, const std::string & start_of_message = "");
std::string getCurrentExceptionMessage(bool with_stacktrace);
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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(std::exception_ptr e, bool with_stacktrace);
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void rethrowFirstException(const Exceptions & exceptions);
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std::unique_ptr<Poco::Exception> convertCurrentException();
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template <typename T>
typename std::enable_if<std::is_pointer<T>::value, T>::type exception_cast(std::exception_ptr e)
{
try
{
std::rethrow_exception(e);
}
catch (typename std::remove_pointer<T>::type & concrete)
{
return &concrete;
}
catch (...)
{
return nullptr;
}
}
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}