Break up common functions and small refactor.

gemini/errors.go

@@ -1,100 +0,0 @@
-package gemini
-
-import (
-	"errors"
-	"fmt"
-)
-
-type GeminiError struct {
-	Msg    string
-	Code   int
-	Header string
-}
-
-func (e *GeminiError) Error() string {
-	return fmt.Sprintf("%s: %s", e.Msg, e.Header)
-}
-
-func NewErrGeminiStatusCode(code int, header string) error {
-	var msg string
-	switch {
-	case code >= 10 && code < 20:
-		msg = "needs input"
-	case code >= 30 && code < 40:
-		msg = "redirect"
-	case code >= 40 && code < 50:
-		msg = "bad request"
-	case code >= 50 && code < 60:
-		msg = "server error"
-	case code >= 60 && code < 70:
-		msg = "TLS error"
-	default:
-		msg = "unexpected status code"
-	}
-	return &GeminiError{
-		Msg:    msg,
-		Code:   code,
-		Header: header,
-	}
-}
-
-var (
-	ErrGeminiRobotsParse      = errors.New("gemini robots.txt parse error")
-	ErrGeminiRobotsDisallowed = errors.New("gemini robots.txt disallowed")
-	ErrGeminiResponseHeader   = errors.New("gemini response header error")
-	ErrGeminiRedirect         = errors.New("gemini redirection error")
-	ErrGeminiLinkLineParse    = errors.New("gemini link line parse error")
-
-	ErrURLParse     = errors.New("URL parse error")
-	ErrURLNotGemini = errors.New("not a Gemini URL")
-	ErrURLDecode    = errors.New("URL decode error")
-	ErrUTF8Parse    = errors.New("UTF-8 parse error")
-	ErrTextParse    = errors.New("text parse error")
-
-	ErrNetwork                        = errors.New("network error")
-	ErrNetworkDNS                     = errors.New("network DNS error")
-	ErrNetworkTLS                     = errors.New("network TLS error")
-	ErrNetworkSetConnectionDeadline   = errors.New("network error - cannot set connection deadline")
-	ErrNetworkCannotWrite             = errors.New("network error - cannot write")
-	ErrNetworkResponseSizeExceededMax = errors.New("network error - response size exceeded maximum size")
-
-	ErrDatabase = errors.New("database error")
-)
-
-// We could have used a map for speed, but
-// we would lose ability to check wrapped
-// errors via errors.Is().
-
-var errGemini *GeminiError
-
-var knownErrors = []error{ //nolint:gochecknoglobals
-	errGemini,
-	ErrGeminiLinkLineParse,
-	ErrGeminiRobotsParse,
-	ErrGeminiRobotsDisallowed,
-	ErrGeminiResponseHeader,
-	ErrGeminiRedirect,
-
-	ErrURLParse,
-	ErrURLDecode,
-	ErrUTF8Parse,
-	ErrTextParse,
-
-	ErrNetwork,
-	ErrNetworkDNS,
-	ErrNetworkTLS,
-	ErrNetworkSetConnectionDeadline,
-	ErrNetworkCannotWrite,
-	ErrNetworkResponseSizeExceededMax,
-
-	ErrDatabase,
-}
-
-func IsKnownError(err error) bool {
-	for _, known := range knownErrors {
-		if errors.Is(err, known) {
-			return true
-		}
-	}
-	return errors.As(err, new(*GeminiError))
-}