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code.go
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code.go
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package errors
import (
"fmt"
"net/http"
"sync"
)
var (
unknownCoder defaultCoder = defaultCoder{1, http.StatusInternalServerError, "An internal server error occurred", "http://github.com/leotons/errors/README.md"}
)
// Coder defines an interface for an error code detail information.
type Coder interface {
// HTTP status that should be used for the associated error code.
HTTPStatus() int
// External (user) facing error text.
String() string
// Reference returns the detail documents for user.
Reference() string
// Code returns the code of the coder
Code() int
}
type defaultCoder struct {
// C refers to the integer code of the ErrCode.
C int
// HTTP status that should be used for the associated error code.
HTTP int
// External (user) facing error text.
Ext string
// Ref specify the reference document.
Ref string
}
// Code returns the integer code of the coder.
func (coder defaultCoder) Code() int {
return coder.C
}
// String implements stringer. String returns the external error message,
// if any.
func (coder defaultCoder) String() string {
return coder.Ext
}
// HTTPStatus returns the associated HTTP status code, if any. Otherwise,
// returns 200.
func (coder defaultCoder) HTTPStatus() int {
if coder.HTTP == 0 {
return 500
}
return coder.HTTP
}
// Reference returns the reference document.
func (coder defaultCoder) Reference() string {
return coder.Ref
}
// codes contains a map of error codes to metadata.
var codes = map[int]Coder{}
var codeMux = &sync.Mutex{}
// Register register a user define error code.
// It will overrid the exist code.
func Register(coder Coder) {
if coder.Code() == 0 {
panic("code `0` is reserved by `github.com/leotons/errors` as unknownCode error code")
}
codeMux.Lock()
defer codeMux.Unlock()
codes[coder.Code()] = coder
}
// MustRegister register a user define error code.
// It will panic when the same Code already exist.
func MustRegister(coder Coder) {
if coder.Code() == 0 {
panic("code '0' is reserved by 'github.com/leotons/errors' as ErrUnknown error code")
}
codeMux.Lock()
defer codeMux.Unlock()
if _, ok := codes[coder.Code()]; ok {
panic(fmt.Sprintf("code: %d already exist", coder.Code()))
}
codes[coder.Code()] = coder
}
// ParseCoder parse any error into *withCode.
// nil error will return nil direct.
// None withStack error will be parsed as ErrUnknown.
func ParseCoder(err error) Coder {
if err == nil {
return nil
}
if v, ok := err.(*withCode); ok {
if coder, ok := codes[v.code]; ok {
return coder
}
}
return unknownCoder
}
// IsCode reports whether any error in err's chain contains the given error code.
func IsCode(err error, code int) bool {
if v, ok := err.(*withCode); ok {
if v.code == code {
return true
}
if v.cause != nil {
return IsCode(v.cause, code)
}
return false
}
return false
}
func init() {
codes[unknownCoder.Code()] = unknownCoder
}