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connectableHost.go
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/
connectableHost.go
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package libp2p
import (
"context"
"github.com/libp2p/go-libp2p-core/host"
"github.com/libp2p/go-libp2p-core/peer"
"github.com/multiformats/go-multiaddr"
)
// PeerInfoHandler is the signature of the handler that gets called whenever an action for a peerInfo is triggered
type PeerInfoHandler func(pInfo peer.AddrInfo)
// ConnectableHost is an enhanced Host interface that has the ability to connect to a string address
type ConnectableHost interface {
host.Host
ConnectToPeer(ctx context.Context, address string) error
AddressToPeerInfo(address string) (*peer.AddrInfo, error)
IsInterfaceNil() bool
}
type connectableHost struct {
host.Host
}
// NewConnectableHost creates a new connectable host implementation
func NewConnectableHost(h host.Host) *connectableHost {
return &connectableHost{
Host: h,
}
}
// AddressToPeerInfo converts the unified string address into libp2p address components: PeerID and multi-address slice
func (connHost *connectableHost) AddressToPeerInfo(address string) (*peer.AddrInfo, error) {
multiAddr, err := multiaddr.NewMultiaddr(address)
if err != nil {
return nil, err
}
return peer.AddrInfoFromP2pAddr(multiAddr)
}
// ConnectToPeer connects to a peer by knowing its string address
func (connHost *connectableHost) ConnectToPeer(ctx context.Context, address string) error {
pInfo, err := connHost.AddressToPeerInfo(address)
if err != nil {
return err
}
return connHost.Connect(ctx, *pInfo)
}
// IsInterfaceNil returns true if there is no value under the interface
func (connHost *connectableHost) IsInterfaceNil() bool {
return connHost == nil
}