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peerDiscovererFactory.go
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peerDiscovererFactory.go
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package factory
import (
"context"
"fmt"
"time"
logger "github.com/ElrondNetwork/elrond-go-logger"
"github.com/ElrondNetwork/elrond-go/config"
"github.com/ElrondNetwork/elrond-go/p2p"
"github.com/ElrondNetwork/elrond-go/p2p/libp2p/discovery"
)
const typeLegacy = "legacy"
const typeOptimized = "optimized"
const defaultSeedersReconnectionInterval = time.Minute * 5
var log = logger.GetOrCreate("p2p/discovery/factory")
// NewPeerDiscoverer generates an implementation of PeerDiscoverer by parsing the p2pConfig struct
// Errors if config is badly formatted
func NewPeerDiscoverer(
context context.Context,
host discovery.ConnectableHost,
sharder p2p.Sharder,
p2pConfig config.P2PConfig,
) (p2p.PeerDiscoverer, error) {
if p2pConfig.KadDhtPeerDiscovery.Enabled {
return createKadDhtPeerDiscoverer(context, host, sharder, p2pConfig)
}
log.Debug("using nil discoverer")
return discovery.NewNilDiscoverer(), nil
}
func createKadDhtPeerDiscoverer(
context context.Context,
host discovery.ConnectableHost,
sharder p2p.Sharder,
p2pConfig config.P2PConfig,
) (p2p.PeerDiscoverer, error) {
arg := discovery.ArgKadDht{
Context: context,
Host: host,
KddSharder: sharder,
PeersRefreshInterval: time.Second * time.Duration(p2pConfig.KadDhtPeerDiscovery.RefreshIntervalInSec),
SeedersReconnectionInterval: defaultSeedersReconnectionInterval,
ProtocolID: p2pConfig.KadDhtPeerDiscovery.ProtocolID,
InitialPeersList: p2pConfig.KadDhtPeerDiscovery.InitialPeerList,
BucketSize: p2pConfig.KadDhtPeerDiscovery.BucketSize,
RoutingTableRefresh: time.Second * time.Duration(p2pConfig.KadDhtPeerDiscovery.RoutingTableRefreshIntervalInSec),
}
switch p2pConfig.Sharding.Type {
case p2p.ListsSharder, p2p.OneListSharder, p2p.NilListSharder:
return createKadDhtDiscoverer(p2pConfig, arg)
default:
return nil, fmt.Errorf("%w unable to select peer discoverer based on "+
"selected sharder: unknown sharder '%s'", p2p.ErrInvalidValue, p2pConfig.Sharding.Type)
}
}
func createKadDhtDiscoverer(p2pConfig config.P2PConfig, arg discovery.ArgKadDht) (p2p.PeerDiscoverer, error) {
switch p2pConfig.KadDhtPeerDiscovery.Type {
case typeLegacy:
log.Debug("using continuous (legacy) kad dht discoverer")
return discovery.NewContinuousKadDhtDiscoverer(arg)
case typeOptimized:
log.Debug("using optimized kad dht discoverer")
return discovery.NewOptimizedKadDhtDiscoverer(arg)
default:
return nil, fmt.Errorf("%w unable to select peer discoverer based on type '%s'",
p2p.ErrInvalidValue, p2pConfig.KadDhtPeerDiscovery.Type)
}
}