/
discovery.go
101 lines (81 loc) · 2.6 KB
/
discovery.go
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package discovery
import (
"fmt"
"net"
"strings"
"sync"
"github.com/cockroachdb/errors"
"github.com/iotaledger/hive.go/autopeering/discover"
"github.com/iotaledger/hive.go/autopeering/peer"
"github.com/iotaledger/hive.go/autopeering/peer/service"
"github.com/iotaledger/hive.go/crypto/ed25519"
"github.com/iotaledger/hive.go/identity"
"github.com/iotaledger/hive.go/logger"
"github.com/mr-tron/base58"
"github.com/iotaledger/goshimmer/plugins/autopeering/local"
)
// autopeering constants
const (
ProtocolVersion = 0 // update on protocol changes
// PluginName is the name of the autopeering plugin.
PluginName = "Autopeering"
entryNodeParts = 2
)
var (
// ErrParsingEntryNode is returned for an invalid entry node.
ErrParsingEntryNode = errors.New("cannot parse entry node")
// the peer discovery protocol
peerDisc *discover.Protocol
peerDiscOnce sync.Once
networkVersion uint32
)
// Discovery returns the peer discovery instance.
func Discovery() *discover.Protocol {
peerDiscOnce.Do(createPeerDisc)
return peerDisc
}
func createPeerDisc() {
// assure that the logger is available
log := logger.NewLogger(PluginName).Named("disc")
networkVersion = uint32(Parameters.NetworkVersion)
entryNodes, err := parseEntryNodes()
if err != nil {
log.Errorf("Invalid entry nodes; ignoring: %v", err)
}
log.Debugf("Entry nodes: %v", entryNodes)
peerDisc = discover.New(local.GetInstance(), ProtocolVersion, NetworkVersion(),
discover.Logger(log),
discover.MasterPeers(entryNodes),
)
}
func parseEntryNodes() (result []*peer.Peer, err error) {
for _, entryNodeDefinition := range Parameters.EntryNodes {
if entryNodeDefinition == "" {
continue
}
parts := strings.Split(entryNodeDefinition, "@")
if len(parts) != entryNodeParts {
return nil, fmt.Errorf("%w: entry node information must contains %d parts, is %d", ErrParsingEntryNode, entryNodeParts, len(parts))
}
pubKey, err := base58.Decode(parts[0])
if err != nil {
return nil, fmt.Errorf("%w: invalid public key: %s", ErrParsingEntryNode, err)
}
addr, err := net.ResolveUDPAddr("udp", parts[1])
if err != nil {
return nil, fmt.Errorf("%w: host cannot be resolved: %s", ErrParsingEntryNode, err)
}
publicKey, _, err := ed25519.PublicKeyFromBytes(pubKey)
if err != nil {
return nil, err
}
services := service.New()
services.Update(service.PeeringKey, addr.Network(), addr.Port)
result = append(result, peer.NewPeer(identity.New(publicKey), addr.IP, services))
}
return result, nil
}
// NetworkVersion returns the network version of the autopeering.
func NetworkVersion() uint32 {
return networkVersion
}