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options.go
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options.go
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package p2p
import (
"crypto/ecdsa"
"fmt"
"net"
"github.com/libp2p/go-libp2p"
"github.com/libp2p/go-libp2p-core/peer"
noise "github.com/libp2p/go-libp2p-noise"
"github.com/libp2p/go-tcp-transport"
ma "github.com/multiformats/go-multiaddr"
"github.com/pkg/errors"
"github.com/prysmaticlabs/prysm/runtime/version"
)
// buildOptions for the libp2p host.
func (s *Service) buildOptions(ip net.IP, priKey *ecdsa.PrivateKey) []libp2p.Option {
cfg := s.cfg
listen, err := multiAddressBuilder(ip.String(), cfg.TCPPort)
if err != nil {
log.Fatalf("Failed to p2p listen: %v", err)
}
if cfg.LocalIP != "" {
if net.ParseIP(cfg.LocalIP) == nil {
log.Fatalf("Invalid local ip provided: %s", cfg.LocalIP)
}
listen, err = multiAddressBuilder(cfg.LocalIP, cfg.TCPPort)
if err != nil {
log.Fatalf("Failed to p2p listen: %v", err)
}
}
options := []libp2p.Option{
privKeyOption(priKey),
libp2p.ListenAddrs(listen),
libp2p.UserAgent(version.BuildData()),
libp2p.ConnectionGater(s),
libp2p.Transport(tcp.NewTCPTransport),
}
options = append(options, libp2p.Security(noise.ID, noise.New))
if cfg.EnableUPnP {
options = append(options, libp2p.NATPortMap()) // Allow to use UPnP
}
if cfg.RelayNodeAddr != "" {
options = append(options, libp2p.AddrsFactory(withRelayAddrs(cfg.RelayNodeAddr)))
} else {
// Disable relay if it has not been set.
options = append(options, libp2p.DisableRelay())
}
if cfg.HostAddress != "" {
options = append(options, libp2p.AddrsFactory(func(addrs []ma.Multiaddr) []ma.Multiaddr {
external, err := multiAddressBuilder(cfg.HostAddress, cfg.TCPPort)
if err != nil {
log.WithError(err).Error("Unable to create external multiaddress")
} else {
addrs = append(addrs, external)
}
return addrs
}))
}
if cfg.HostDNS != "" {
options = append(options, libp2p.AddrsFactory(func(addrs []ma.Multiaddr) []ma.Multiaddr {
external, err := ma.NewMultiaddr(fmt.Sprintf("/dns4/%s/tcp/%d", cfg.HostDNS, cfg.TCPPort))
if err != nil {
log.WithError(err).Error("Unable to create external multiaddress")
} else {
addrs = append(addrs, external)
}
return addrs
}))
}
// Disable Ping Service.
options = append(options, libp2p.Ping(false))
return options
}
func multiAddressBuilder(ipAddr string, port uint) (ma.Multiaddr, error) {
parsedIP := net.ParseIP(ipAddr)
if parsedIP.To4() == nil && parsedIP.To16() == nil {
return nil, errors.Errorf("invalid ip address provided: %s", ipAddr)
}
if parsedIP.To4() != nil {
return ma.NewMultiaddr(fmt.Sprintf("/ip4/%s/tcp/%d", ipAddr, port))
}
return ma.NewMultiaddr(fmt.Sprintf("/ip6/%s/tcp/%d", ipAddr, port))
}
func multiAddressBuilderWithID(ipAddr, protocol string, port uint, id peer.ID) (ma.Multiaddr, error) {
parsedIP := net.ParseIP(ipAddr)
if parsedIP.To4() == nil && parsedIP.To16() == nil {
return nil, errors.Errorf("invalid ip address provided: %s", ipAddr)
}
if id.String() == "" {
return nil, errors.New("empty peer id given")
}
if parsedIP.To4() != nil {
return ma.NewMultiaddr(fmt.Sprintf("/ip4/%s/%s/%d/p2p/%s", ipAddr, protocol, port, id.String()))
}
return ma.NewMultiaddr(fmt.Sprintf("/ip6/%s/%s/%d/p2p/%s", ipAddr, protocol, port, id.String()))
}
// Adds a private key to the libp2p option if the option was provided.
// If the private key file is missing or cannot be read, or if the
// private key contents cannot be marshaled, an exception is thrown.
func privKeyOption(privkey *ecdsa.PrivateKey) libp2p.Option {
return func(cfg *libp2p.Config) error {
log.Debug("ECDSA private key generated")
return cfg.Apply(libp2p.Identity(convertToInterfacePrivkey(privkey)))
}
}