frostfs-node/pkg/network/address.go

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package network
import (
"fmt"
"net"
"strings"
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"github.com/multiformats/go-multiaddr"
manet "github.com/multiformats/go-multiaddr/net"
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)
/*
HostAddr strings: "localhost:8080", ":8080", "192.168.0.1:8080"
MultiAddr strings: "/dns4/localhost/tcp/8080", "/ip4/192.168.0.1/tcp/8080"
IPAddr strings: "192.168.0.1:8080"
*/
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// Address represents the NeoFS node
// network address.
type Address struct {
ma multiaddr.Multiaddr
}
// LocalAddressSource is an interface of local
// network address container with read access.
type LocalAddressSource interface {
LocalAddress() AddressGroup
}
// String returns multiaddr string.
func (a Address) String() string {
return a.ma.String()
}
// equal compares Address's.
func (a Address) equal(addr Address) bool {
return a.ma.Equal(addr.ma)
}
// HostAddr returns host address in string format.
//
// Panics if host address cannot be fetched from Address.
func (a Address) HostAddr() string {
_, host, err := manet.DialArgs(a.ma)
if err != nil {
// the only correct way to construct Address is AddressFromString
// which makes this error appear unexpected
panic(fmt.Errorf("could not get host addr: %w", err))
}
return host
}
// FromString restores Address from a string representation.
//
// Supports MultiAddr and HostAddr strings.
func (a *Address) FromString(s string) error {
var err error
a.ma, err = multiaddr.NewMultiaddr(s)
if err != nil {
s, err = multiaddrStringFromHostAddr(s)
if err == nil {
a.ma, err = multiaddr.NewMultiaddr(s)
}
}
return err
}
// multiaddrStringFromHostAddr converts "localhost:8080" to "/dns4/localhost/tcp/8080"
func multiaddrStringFromHostAddr(host string) (string, error) {
endpoint, port, err := net.SplitHostPort(host)
if err != nil {
return "", err
}
// Empty address in host `:8080` generates `/dns4//tcp/8080` multiaddr
// which is invalid. It could be `/tcp/8080` but this breaks
// `manet.DialArgs`. The solution is to manually parse it as 0.0.0.0
if endpoint == "" {
return "/ip4/0.0.0.0/tcp/" + port, nil
}
var (
prefix = "/dns4"
addr = endpoint
)
if ip := net.ParseIP(endpoint); ip != nil {
addr = ip.String()
if ip.To4() == nil {
prefix = "/ip6"
} else {
prefix = "/ip4"
}
}
const l4Protocol = "tcp"
return strings.Join([]string{prefix, addr, l4Protocol, port}, "/"), nil
}
// IsLocalAddress returns true if network endpoints from local address group
// source intersects with network endpoints of passed address group.
func IsLocalAddress(src LocalAddressSource, addr AddressGroup) bool {
return src.LocalAddress().Intersects(addr)
}