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use a basichost, not a blankhost when constructing autonat #1257

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use a basichost, not a blankhost when constructing autonat #1257

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9a52909
use a basichost, not a blankhost when constructing autonat
marten-seemann Dec 8, 2021
fdc7b1d
add a host option to disable identify, use it for the autonat host
marten-seemann Dec 9, 2021
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9 changes: 6 additions & 3 deletions config/config.go
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Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,6 @@ import (
"github.com/libp2p/go-libp2p/p2p/protocol/holepunch"

autonat "github.com/libp2p/go-libp2p-autonat"
blankhost "github.com/libp2p/go-libp2p-blankhost"
discovery "github.com/libp2p/go-libp2p-discovery"
swarm "github.com/libp2p/go-libp2p-swarm"
tptu "github.com/libp2p/go-libp2p-transport-upgrader"
Expand Down Expand Up @@ -307,12 +306,16 @@ func (cfg *Config) NewNode() (host.Host, error) {
Peerstore: ps,
}

dialer, err := autoNatCfg.makeSwarm()
dialerSwarm, err := autoNatCfg.makeSwarm()
if err != nil {
h.Close()
return nil, err
}
dialerHost, err := bhost.NewHost(dialerSwarm, nil)
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are we sure there is nothing listening? We need identify only and nothing else.

Also, whats this nil we are passing?

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Identify is always added:

go-libp2p/p2p/host/basic/basic_host.go

Lines 223 to 227 in 0f76f17

if h.disableSignedPeerRecord {
h.ids, err = identify.NewIDService(h, identify.UserAgent(opts.UserAgent), identify.DisableSignedPeerRecord())
} else {
h.ids, err = identify.NewIDService(h, identify.UserAgent(opts.UserAgent))
}

The nil is a HostOpts:

go-libp2p/p2p/host/basic/basic_host.go

Lines 113 to 155 in 0f76f17

type HostOpts struct {
// MultistreamMuxer is essential for the *BasicHost and will use a sensible default value if omitted.
MultistreamMuxer *msmux.MultistreamMuxer
// NegotiationTimeout determines the read and write timeouts on streams.
// If 0 or omitted, it will use DefaultNegotiationTimeout.
// If below 0, timeouts on streams will be deactivated.
NegotiationTimeout time.Duration
// AddrsFactory holds a function which can be used to override or filter the result of Addrs.
// If omitted, there's no override or filtering, and the results of Addrs and AllAddrs are the same.
AddrsFactory AddrsFactory
// MultiaddrResolves holds the go-multiaddr-dns.Resolver used for resolving
// /dns4, /dns6, and /dnsaddr addresses before trying to connect to a peer.
MultiaddrResolver *madns.Resolver
// NATManager takes care of setting NAT port mappings, and discovering external addresses.
// If omitted, this will simply be disabled.
NATManager func(network.Network) NATManager
// ConnManager is a libp2p connection manager
ConnManager connmgr.ConnManager
// EnablePing indicates whether to instantiate the ping service
EnablePing bool
// EnableRelayService enables the circuit v2 relay (if we're publicly reachable).
EnableRelayService bool
// RelayServiceOpts are options for the circuit v2 relay.
RelayServiceOpts []relayv2.Option
// UserAgent sets the user-agent for the host.
UserAgent string
// DisableSignedPeerRecord disables the generation of Signed Peer Records on this host.
DisableSignedPeerRecord bool
// EnableHolePunching enables the peer to initiate/respond to hole punching attempts for NAT traversal.
EnableHolePunching bool
// HolePunchingOptions are options for the hole punching service
HolePunchingOptions []holepunch.Option
}
.

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can we also neuter the peerstore?

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we should pass a noop one, which we may have to shim.

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What do you mean by "neuter"? We need some kind of peerstore, as autonat is first adding the peer info, and then connecting (since the swarm doesn't allow us to dial an address directly).

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ah yes, indeed.

Can we make a variant with minimal overhead that just immediately removes everything when the peer is disconnected?
We dont need a peer manager and we dont care about caching addrs.

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Maybe that should be part of autonat? The peerstore exposes a RemovePeer method, so we could call that one.

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that might be the right thing to do, esp if we move the pstoremgr responsibility to the host.

Only concern is we keep addrs for some 10min, as recently connected.

if err != nil {
h.Close()
return nil, err
}
dialerHost := blankhost.NewBlankHost(dialer)
if err := autoNatCfg.addTransports(dialerHost); err != nil {
dialerHost.Close()
h.Close()
Expand Down