/
errors.go
87 lines (73 loc) · 1.61 KB
/
errors.go
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package rest
import (
"errors"
"io"
"net/http"
"github.com/uptrace/bunrouter"
)
var ErrNotFound = errors.New("resource not found")
type NotFoundError struct {
Message string
}
func (e NotFoundError) Error() string {
return e.Message
}
type ValidationError struct {
Message string
}
func (e ValidationError) Error() string {
return e.Message
}
type HTTPError struct {
StatusCode int `json:"-"`
Message string `json:"message"`
}
func (e HTTPError) Error() string {
return e.Message
}
func NewHTTPError(err error) HTTPError {
switch err := err.(type) {
case NotFoundError:
return HTTPError{
StatusCode: http.StatusNotFound,
Message: err.Message,
}
case ValidationError:
return HTTPError{
StatusCode: http.StatusBadRequest,
Message: err.Message,
}
}
switch err {
case ErrNotFound:
return HTTPError{
StatusCode: http.StatusNotFound,
Message: "resource not found",
}
case io.EOF:
return HTTPError{
StatusCode: http.StatusBadRequest,
Message: "EOF reading HTTP request body",
}
}
return HTTPError{
StatusCode: http.StatusInternalServerError,
Message: "Internal server error",
}
}
func errorHandler(next bunrouter.HandlerFunc) bunrouter.HandlerFunc {
return func(w http.ResponseWriter, req bunrouter.Request) error {
err := next(w, req)
switch err := err.(type) {
case nil:
// no error
case HTTPError: // already a HTTPError
w.WriteHeader(err.StatusCode)
_ = JSON(w, err.StatusCode, err)
default:
httpErr := NewHTTPError(err)
_ = JSON(w, httpErr.StatusCode, httpErr)
}
return err // return the err in case there other middlewares
}
}