Status.h

//------------------------------------------------------------------------------
/*
    This file is part of rippled: https://github.com/ripple/rippled
    Copyright (c) 2012, 2013 Ripple Labs Inc.
 
    Permission to use, copy, modify, and/or distribute this software for any
    purpose  with  or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.
 
    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================
 
#ifndef RIPPLE_RPC_STATUS_H_INCLUDED
#define RIPPLE_RPC_STATUS_H_INCLUDED
 
#include <ripple/protocol/TER.h>
#include <ripple/protocol/ErrorCodes.h>
#include <cassert>
 
namespace ripple {
namespace RPC {
 
struct Status : public std::exception
{
public:
    enum class Type {none, TER, error_code_i};
    using Code = int;
    using Strings = std::vector <std::string>;
 
    static constexpr Code OK = 0;
 
    Status () = default;
 
    // The enable_if allows only integers (not enums).  Prevents enum narrowing.
    template <typename T,
        typename = std::enable_if_t<std::is_integral<T>::value>>
    Status (T code, Strings d = {})
        : type_ (Type::none), code_ (code), messages_ (std::move (d))
    {
    }
 
    Status (TER ter, Strings d = {})
        : type_ (Type::TER), code_ (TERtoInt (ter)), messages_ (std::move (d))
    {
    }
 
    Status (error_code_i e, Strings d = {})
        : type_ (Type::error_code_i), code_ (e), messages_ (std::move (d))
    {
    }
 
    Status (error_code_i e, std::string const& s)
        : type_ (Type::error_code_i), code_ (e), messages_ ({s})
    {
    }
 
    /* Returns a representation of the integer status Code as a string.
       If the Status is OK, the result is an empty string.
    */
    std::string codeString () const;
 
    operator bool() const
    {
        return code_ != OK;
    }
 
    bool operator !() const
    {
        return ! bool (*this);
    }
 
    TER toTER () const
    {
        assert (type_ == Type::TER);
        return TER::fromInt (code_);
    }
 
    error_code_i toErrorCode() const
    {
        assert (type_ == Type::error_code_i);
        return error_code_i (code_);
    }
 
    template <class Object>
    void inject (Object& object) const
    {
        if (auto ec = toErrorCode())
        {
            if (messages_.empty())
                inject_error (ec, object);
            else
                inject_error (ec, message(), object);
        }
    }
 
    Strings const& messages() const
    {
        return messages_;
    }
 
    std::string message() const;
 
    Type type() const
    {
        return type_;
    }
 
    std::string toString() const;
 
    void fillJson(Json::Value&);
 
private:
    Type type_ = Type::none;
    Code code_ = OK;
    Strings messages_;
};
 
} // namespace RPC
} // ripple
 
#endif