package migrate import ( "fmt" nurl "net/url" "strings" ) // MultiError holds multiple errors. type MultiError struct { Errs []error } // NewMultiError returns an error type holding multiple errors. func NewMultiError(errs ...error) MultiError { compactErrs := make([]error, 0) for _, e := range errs { if e != nil { compactErrs = append(compactErrs, e) } } return MultiError{compactErrs} } // Error implements error. Mulitple errors are concatenated with 'and's. func (m MultiError) Error() string { var strs = make([]string, 0) for _, e := range m.Errs { if len(e.Error()) > 0 { strs = append(strs, e.Error()) } } return strings.Join(strs, " and ") } // suint safely converts int to uint // see https://goo.gl/wEcqof // see https://goo.gl/pai7Dr func suint(n int) uint { if n < 0 { panic(fmt.Sprintf("suint(%v) expects input >= 0", n)) } return uint(n) } var errNoScheme = fmt.Errorf("no scheme") // schemeFromUrl returns the scheme from a URL string func schemeFromUrl(url string) (string, error) { u, err := nurl.Parse(url) if err != nil { return "", err } if len(u.Scheme) == 0 { return "", errNoScheme } return u.Scheme, nil } // FilterCustomQuery filters all query values starting with `x-` func FilterCustomQuery(u *nurl.URL) *nurl.URL { ux := *u vx := make(nurl.Values) for k, v := range ux.Query() { if len(k) <= 1 || (len(k) > 1 && k[0:2] != "x-") { vx[k] = v } } ux.RawQuery = vx.Encode() return &ux }