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feat: make a const of magic-number

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Signed-off-by: haoyun <yun.hao@daocloud.io>
Co-authored-by: Lubomir I. Ivanov <neolit123@gmail.com>
This commit is contained in:
haoyun 2021-10-21 14:37:38 +08:00
parent 1af8a8c026
commit 9b5f28053c
1 changed files with 13 additions and 2 deletions
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15
cmd/kubeadm/app/apis/bootstraptoken/v1/utils.go
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@ -31,6 +31,18 @@ import (
bootstrapsecretutil "k8s.io/cluster-bootstrap/util/secrets"
)
const (
// When a token is matched with 'BootstrapTokenPattern', the size of validated substrings returned by
// regexp functions which contains 'Submatch' in their names will be 3.
// Submatch 0 is the match of the entire expression, submatch 1 is
// the match of the first parenthesized subexpression, and so on.
// e.g.:
// result := bootstraputil.BootstrapTokenRegexp.FindStringSubmatch("abcdef.1234567890123456")
// result == []string{"abcdef.1234567890123456","abcdef","1234567890123456"}
// len(result) == 3
validatedSubstringsSize = 3
)
// MarshalJSON implements the json.Marshaler interface.
func (bts BootstrapTokenString) MarshalJSON() ([]byte, error) {
return []byte(fmt.Sprintf(`"%s"`, bts.String())), nil
@ -69,8 +81,7 @@ func (bts BootstrapTokenString) String() string {
// is of the right format
func NewBootstrapTokenString(token string) (*BootstrapTokenString, error) {
substrs := bootstraputil.BootstrapTokenRegexp.FindStringSubmatch(token)
// TODO: Add a constant for the 3 value here, and explain better why it's needed (other than because how the regexp parsin works)
if len(substrs) != 3 {
if len(substrs) != validatedSubstringsSize {
return nil, errors.Errorf("the bootstrap token %q was not of the form %q", token, bootstrapapi.BootstrapTokenPattern)
}