147 lines
3.4 KiB
Go
147 lines
3.4 KiB
Go
package network
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import (
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"fmt"
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"net"
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"net/url"
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"strings"
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"github.com/multiformats/go-multiaddr"
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manet "github.com/multiformats/go-multiaddr/net"
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)
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/*
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HostAddr strings: "localhost:8080", ":8080", "192.168.0.1:8080"
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MultiAddr strings: "/dns4/localhost/tcp/8080", "/ip4/192.168.0.1/tcp/8080"
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IPAddr strings: "192.168.0.1:8080"
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URIAddr strings: "<scheme://>127.0.0.1:8080"
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*/
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// Address represents the NeoFS node
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// network address.
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type Address struct {
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ma multiaddr.Multiaddr
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}
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// String returns multiaddr string.
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func (a Address) String() string {
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return a.ma.String()
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}
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// equal compares Address's.
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func (a Address) equal(addr Address) bool {
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return a.ma.Equal(addr.ma)
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}
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// HostAddr returns host address in string format.
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//
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// Panics if host address cannot be fetched from Address.
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func (a Address) HostAddr() string {
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_, host, err := manet.DialArgs(a.ma)
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if err != nil {
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// the only correct way to construct Address is AddressFromString
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// which makes this error appear unexpected
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panic(fmt.Errorf("could not get host addr: %w", err))
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}
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return host
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}
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// FromString restores Address from a string representation.
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//
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// Supports URIAddr, MultiAddr and HostAddr strings.
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func (a *Address) FromString(s string) error {
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var err error
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a.ma, err = multiaddr.NewMultiaddr(s)
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if err != nil {
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var (
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host string
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hasTLS bool
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)
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host, hasTLS, err = parseURI(s)
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if err != nil {
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host = s
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}
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s, err = multiaddrStringFromHostAddr(host)
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if err == nil {
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a.ma, err = multiaddr.NewMultiaddr(s)
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if err == nil && hasTLS {
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a.ma = a.ma.Encapsulate(tls)
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}
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}
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}
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return err
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}
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const (
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grpcScheme = "grpc"
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grpcTLSScheme = "grpcs"
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)
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// parseURI parses s as address and returns a host and a flag
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// indicating that TLS is enabled. If multiaddress is provided
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// the argument is returned unchanged.
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func parseURI(s string) (string, bool, error) {
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// TODO: code is copy-pasted from client.WithURIAddress function.
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// Would be nice to share the code.
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uri, err := url.ParseRequestURI(s)
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if err != nil {
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return s, false, nil
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}
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// check if passed string was parsed correctly
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// URIs that do not start with a slash after the scheme are interpreted as:
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// `scheme:opaque` => if `opaque` is not empty, then it is supposed that URI
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// is in `host:port` format
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if uri.Host == "" {
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uri.Host = uri.Scheme
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uri.Scheme = grpcScheme // assume GRPC by default
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if uri.Opaque != "" {
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uri.Host = net.JoinHostPort(uri.Host, uri.Opaque)
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}
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}
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switch uri.Scheme {
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case grpcTLSScheme, grpcScheme:
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default:
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return "", false, fmt.Errorf("unsupported scheme: %s", uri.Scheme)
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}
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return uri.Host, uri.Scheme == grpcTLSScheme, nil
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}
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// multiaddrStringFromHostAddr converts "localhost:8080" to "/dns4/localhost/tcp/8080"
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func multiaddrStringFromHostAddr(host string) (string, error) {
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endpoint, port, err := net.SplitHostPort(host)
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if err != nil {
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return "", err
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}
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// Empty address in host `:8080` generates `/dns4//tcp/8080` multiaddr
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// which is invalid. It could be `/tcp/8080` but this breaks
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// `manet.DialArgs`. The solution is to manually parse it as 0.0.0.0
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if endpoint == "" {
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return "/ip4/0.0.0.0/tcp/" + port, nil
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}
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var (
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prefix = "/dns4"
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addr = endpoint
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)
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if ip := net.ParseIP(endpoint); ip != nil {
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addr = ip.String()
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if ip.To4() == nil {
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prefix = "/ip6"
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} else {
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prefix = "/ip4"
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}
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}
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const l4Protocol = "tcp"
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return strings.Join([]string{prefix, addr, l4Protocol, port}, "/"), nil
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}
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