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// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package errs
import (
"fmt"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
)
/*
Errors implements an error handler providing standardised errors for a package.
Fields:
Errors:
a map from error codes to description
Package:
name of the package/component
Level:
a function mapping error code to logger.LogLevel (severity)
if not given, errors default to logger.InfoLevel
*/
type Errors struct {
Errors map[int]string
Package string
Level func(code int) logger.LogLevel
}
/*
Error implements the standard go error interface.
errors.New(code, format, params ...interface{})
Prints as:
[package] description: details
where details is fmt.Sprintf(self.format, self.params...)
*/
type Error struct {
Code int
Name string
Package string
level logger.LogLevel
message string
format string
params []interface{}
}
func (self *Errors) New(code int, format string, params ...interface{}) *Error {
name, ok := self.Errors[code]
if !ok {
panic("invalid error code")
}
level := logger.InfoLevel
if self.Level != nil {
level = self.Level(code)
}
return &Error{
Code: code,
Name: name,
Package: self.Package,
level: level,
format: format,
params: params,
}
}
func (self Error) Error() (message string) {
if len(message) == 0 {
self.message = fmt.Sprintf("[%s] ERROR: %s", self.Package, self.Name)
if self.format != "" {
self.message += ": " + fmt.Sprintf(self.format, self.params...)
}
}
return self.message
}
func (self Error) Log(v glog.Verbose) {
if v {
v.Infoln(self)
}
}
/*
err.Fatal() is true if err's severity level is 0 or 1 (logger.ErrorLevel or logger.Silence)
*/
func (self *Error) Fatal() (fatal bool) {
if self.level < logger.WarnLevel {
fatal = true
}
return
}
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