48 строки
1021 B
Go
48 строки
1021 B
Go
package opts
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import (
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"fmt"
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"net"
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)
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// IPOpt holds an IP. It is used to store values from CLI flags.
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type IPOpt struct {
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*net.IP
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}
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// NewIPOpt creates a new IPOpt from a reference net.IP and a
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// string representation of an IP. If the string is not a valid
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// IP it will fallback to the specified reference.
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func NewIPOpt(ref *net.IP, defaultVal string) *IPOpt {
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o := &IPOpt{
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IP: ref,
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}
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o.Set(defaultVal)
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return o
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}
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// Set sets an IPv4 or IPv6 address from a given string. If the given
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// string is not parseable as an IP address it returns an error.
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func (o *IPOpt) Set(val string) error {
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ip := net.ParseIP(val)
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if ip == nil {
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return fmt.Errorf("%s is not an ip address", val)
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}
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*o.IP = ip
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return nil
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}
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// String returns the IP address stored in the IPOpt. If stored IP is a
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// nil pointer, it returns an empty string.
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func (o *IPOpt) String() string {
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if *o.IP == nil {
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return ""
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}
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return o.IP.String()
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}
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// Type returns the type of the option
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func (o *IPOpt) Type() string {
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return "ip"
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}
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