mirror of https://github.com/docker/cli.git
93 lines
2.1 KiB
Go
93 lines
2.1 KiB
Go
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package swarm
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import (
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"bytes"
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"encoding/csv"
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"fmt"
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"io"
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"net"
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"strings"
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)
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// -- ipNetSlice Value
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type ipNetSliceValue struct {
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value *[]net.IPNet
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changed bool
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}
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func newIPNetSliceValue(val []net.IPNet, p *[]net.IPNet) *ipNetSliceValue {
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ipnsv := new(ipNetSliceValue)
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ipnsv.value = p
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*ipnsv.value = val
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return ipnsv
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}
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// Set converts, and assigns, the comma-separated IPNet argument string representation as the []net.IPNet value of this flag.
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// If Set is called on a flag that already has a []net.IPNet assigned, the newly converted values will be appended.
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func (s *ipNetSliceValue) Set(val string) error {
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// remove all quote characters
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rmQuote := strings.NewReplacer(`"`, "", `'`, "", "`", "")
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// read flag arguments with CSV parser
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ipNetStrSlice, err := readAsCSV(rmQuote.Replace(val))
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if err != nil && err != io.EOF {
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return err
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}
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// parse ip values into slice
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out := make([]net.IPNet, 0, len(ipNetStrSlice))
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for _, ipNetStr := range ipNetStrSlice {
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_, n, err := net.ParseCIDR(strings.TrimSpace(ipNetStr))
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if err != nil {
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return fmt.Errorf("invalid string being converted to CIDR: %s", ipNetStr)
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}
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out = append(out, *n)
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}
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if !s.changed {
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*s.value = out
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} else {
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*s.value = append(*s.value, out...)
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}
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s.changed = true
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return nil
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}
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// Type returns a string that uniquely represents this flag's type.
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func (s *ipNetSliceValue) Type() string {
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return "ipNetSlice"
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}
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// String defines a "native" format for this net.IPNet slice flag value.
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func (s *ipNetSliceValue) String() string {
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ipNetStrSlice := make([]string, len(*s.value))
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for i, n := range *s.value {
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ipNetStrSlice[i] = n.String()
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}
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out, _ := writeAsCSV(ipNetStrSlice)
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return "[" + out + "]"
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}
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func readAsCSV(val string) ([]string, error) {
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if val == "" {
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return []string{}, nil
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}
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stringReader := strings.NewReader(val)
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csvReader := csv.NewReader(stringReader)
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return csvReader.Read()
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}
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func writeAsCSV(vals []string) (string, error) {
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b := &bytes.Buffer{}
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w := csv.NewWriter(b)
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err := w.Write(vals)
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if err != nil {
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return "", err
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}
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w.Flush()
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return strings.TrimSuffix(b.String(), "\n"), nil
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}
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