Ally/War commands

pkg/error/generic.go

@@ -0,0 +1,76 @@
+package error
+
+import (
+	"fmt"
+)
+
+const (
+	ErrDummy int = -1
+
+	ErrStorageFailure   int = 1000
+	ErrGameStateInvalid int = 2000
+
+	ErrInputUnknownHostRace     int = 3000
+	ErrInputUnknownOpponentRace int = 3001
+)
+
+func errorText(code int) string {
+	switch code {
+	case ErrDummy:
+		return "Dummy"
+	case ErrStorageFailure:
+		return "Storage failure"
+	case ErrGameStateInvalid:
+		return "Invalid game state"
+	case ErrInputUnknownHostRace:
+		return "Host race name is unknown to this game"
+	case ErrInputUnknownOpponentRace:
+		return "Opponent race name is unknown to this game"
+	default:
+		return fmt.Sprintf("Undescribed error with code %d", code)
+	}
+}
+
+type GenericError struct {
+	code    int
+	subject string
+	err     error
+}
+
+func (ge GenericError) Error() string {
+	msg := errorText(ge.code)
+	if ge.subject != "" {
+		msg += ": " + ge.subject
+	}
+	if ge.err != nil {
+		msg = fmt.Errorf("%s: %w", msg, ge.err).Error()
+	}
+	return msg
+}
+
+func newGenericError(code int, arg ...any) error {
+	e := &GenericError{code: code}
+	if len(arg) > 0 {
+		i := 0
+		switch arg[i].(type) {
+		case error:
+			e.err = arg[i].(error)
+			i += 1
+		}
+		if len(arg) == i+2 {
+			e.subject = fmt.Sprintf(asString(arg[i]), arg[i+1:]...)
+		} else if len(arg) == i+1 {
+			e.subject = asString(arg[i])
+		}
+	}
+	return *e
+}
+
+func asString(v any) string {
+	switch s := v.(type) {
+	case string:
+		return s
+	default:
+		return fmt.Sprint(v)
+	}
+}