470 lines
14 KiB
Go
470 lines
14 KiB
Go
package config
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import (
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"crypto/rand"
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"errors"
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"fmt"
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"time"
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"github.com/libp2p/go-libp2p/core/connmgr"
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"github.com/libp2p/go-libp2p/core/crypto"
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"github.com/libp2p/go-libp2p/core/event"
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"github.com/libp2p/go-libp2p/core/host"
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"github.com/libp2p/go-libp2p/core/metrics"
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"github.com/libp2p/go-libp2p/core/network"
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"github.com/libp2p/go-libp2p/core/peer"
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"github.com/libp2p/go-libp2p/core/peerstore"
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"github.com/libp2p/go-libp2p/core/pnet"
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"github.com/libp2p/go-libp2p/core/protocol"
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"github.com/libp2p/go-libp2p/core/routing"
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"github.com/libp2p/go-libp2p/core/sec"
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"github.com/libp2p/go-libp2p/core/sec/insecure"
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"github.com/libp2p/go-libp2p/core/transport"
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"github.com/libp2p/go-libp2p/p2p/host/autonat"
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"github.com/libp2p/go-libp2p/p2p/host/autorelay"
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bhost "github.com/libp2p/go-libp2p/p2p/host/basic"
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blankhost "github.com/libp2p/go-libp2p/p2p/host/blank"
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"github.com/libp2p/go-libp2p/p2p/host/eventbus"
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"github.com/libp2p/go-libp2p/p2p/host/peerstore/pstoremem"
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routed "github.com/libp2p/go-libp2p/p2p/host/routed"
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"github.com/libp2p/go-libp2p/p2p/net/swarm"
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tptu "github.com/libp2p/go-libp2p/p2p/net/upgrader"
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circuitv2 "github.com/libp2p/go-libp2p/p2p/protocol/circuitv2/client"
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relayv2 "github.com/libp2p/go-libp2p/p2p/protocol/circuitv2/relay"
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"github.com/libp2p/go-libp2p/p2p/protocol/holepunch"
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"github.com/libp2p/go-libp2p/p2p/transport/quicreuse"
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"github.com/prometheus/client_golang/prometheus"
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ma "github.com/multiformats/go-multiaddr"
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madns "github.com/multiformats/go-multiaddr-dns"
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"go.uber.org/fx"
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"go.uber.org/fx/fxevent"
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)
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// AddrsFactory is a function that takes a set of multiaddrs we're listening on and
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// returns the set of multiaddrs we should advertise to the network.
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type AddrsFactory = bhost.AddrsFactory
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// NATManagerC is a NATManager constructor.
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type NATManagerC func(network.Network) bhost.NATManager
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type RoutingC func(host.Host) (routing.PeerRouting, error)
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// AutoNATConfig defines the AutoNAT behavior for the libp2p host.
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type AutoNATConfig struct {
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ForceReachability *network.Reachability
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EnableService bool
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ThrottleGlobalLimit int
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ThrottlePeerLimit int
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ThrottleInterval time.Duration
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}
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type Security struct {
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ID protocol.ID
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Constructor interface{}
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}
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// Config describes a set of settings for a libp2p node
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//
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// This is *not* a stable interface. Use the options defined in the root
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// package.
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type Config struct {
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// UserAgent is the identifier this node will send to other peers when
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// identifying itself, e.g. via the identify protocol.
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//
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// Set it via the UserAgent option function.
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UserAgent string
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// ProtocolVersion is the protocol version that identifies the family
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// of protocols used by the peer in the Identify protocol. It is set
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// using the [ProtocolVersion] option.
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ProtocolVersion string
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PeerKey crypto.PrivKey
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QUICReuse []fx.Option
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Transports []fx.Option
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Muxers []tptu.StreamMuxer
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SecurityTransports []Security
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Insecure bool
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PSK pnet.PSK
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DialTimeout time.Duration
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RelayCustom bool
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Relay bool // should the relay transport be used
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EnableRelayService bool // should we run a circuitv2 relay (if publicly reachable)
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RelayServiceOpts []relayv2.Option
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ListenAddrs []ma.Multiaddr
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AddrsFactory bhost.AddrsFactory
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ConnectionGater connmgr.ConnectionGater
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ConnManager connmgr.ConnManager
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ResourceManager network.ResourceManager
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NATManager NATManagerC
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Peerstore peerstore.Peerstore
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Reporter metrics.Reporter
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MultiaddrResolver *madns.Resolver
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DisablePing bool
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Routing RoutingC
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EnableAutoRelay bool
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AutoRelayOpts []autorelay.Option
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AutoNATConfig
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EnableHolePunching bool
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HolePunchingOptions []holepunch.Option
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DisableMetrics bool
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PrometheusRegisterer prometheus.Registerer
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}
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func (cfg *Config) makeSwarm(eventBus event.Bus, enableMetrics bool) (*swarm.Swarm, error) {
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if cfg.Peerstore == nil {
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return nil, fmt.Errorf("no peerstore specified")
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}
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// Check this early. Prevents us from even *starting* without verifying this.
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if pnet.ForcePrivateNetwork && len(cfg.PSK) == 0 {
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log.Error("tried to create a libp2p node with no Private" +
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" Network Protector but usage of Private Networks" +
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" is forced by the enviroment")
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// Note: This is *also* checked the upgrader itself so it'll be
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// enforced even *if* you don't use the libp2p constructor.
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return nil, pnet.ErrNotInPrivateNetwork
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}
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if cfg.PeerKey == nil {
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return nil, fmt.Errorf("no peer key specified")
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}
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// Obtain Peer ID from public key
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pid, err := peer.IDFromPublicKey(cfg.PeerKey.GetPublic())
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if err != nil {
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return nil, err
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}
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if err := cfg.Peerstore.AddPrivKey(pid, cfg.PeerKey); err != nil {
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return nil, err
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}
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if err := cfg.Peerstore.AddPubKey(pid, cfg.PeerKey.GetPublic()); err != nil {
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return nil, err
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}
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opts := make([]swarm.Option, 0, 6)
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if cfg.Reporter != nil {
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opts = append(opts, swarm.WithMetrics(cfg.Reporter))
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}
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if cfg.ConnectionGater != nil {
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opts = append(opts, swarm.WithConnectionGater(cfg.ConnectionGater))
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}
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if cfg.DialTimeout != 0 {
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opts = append(opts, swarm.WithDialTimeout(cfg.DialTimeout))
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}
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if cfg.ResourceManager != nil {
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opts = append(opts, swarm.WithResourceManager(cfg.ResourceManager))
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}
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if cfg.MultiaddrResolver != nil {
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opts = append(opts, swarm.WithMultiaddrResolver(cfg.MultiaddrResolver))
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}
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if enableMetrics {
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opts = append(opts,
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swarm.WithMetricsTracer(swarm.NewMetricsTracer(swarm.WithRegisterer(cfg.PrometheusRegisterer))))
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}
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// TODO: Make the swarm implementation configurable.
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return swarm.NewSwarm(pid, cfg.Peerstore, eventBus, opts...)
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}
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func (cfg *Config) addTransports(h host.Host) error {
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swrm, ok := h.Network().(transport.TransportNetwork)
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if !ok {
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// Should probably skip this if no transports.
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return fmt.Errorf("swarm does not support transports")
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}
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fxopts := []fx.Option{
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fx.WithLogger(func() fxevent.Logger { return getFXLogger() }),
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fx.Provide(fx.Annotate(tptu.New, fx.ParamTags(`name:"security"`))),
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fx.Supply(cfg.Muxers),
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fx.Supply(h.ID()),
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fx.Provide(func() host.Host { return h }),
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fx.Provide(func() crypto.PrivKey { return h.Peerstore().PrivKey(h.ID()) }),
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fx.Provide(func() connmgr.ConnectionGater { return cfg.ConnectionGater }),
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fx.Provide(func() pnet.PSK { return cfg.PSK }),
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fx.Provide(func() network.ResourceManager { return cfg.ResourceManager }),
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fx.Provide(func() *madns.Resolver { return cfg.MultiaddrResolver }),
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}
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fxopts = append(fxopts, cfg.Transports...)
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if cfg.Insecure {
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fxopts = append(fxopts,
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fx.Provide(
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fx.Annotate(
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func(id peer.ID, priv crypto.PrivKey) []sec.SecureTransport {
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return []sec.SecureTransport{insecure.NewWithIdentity(insecure.ID, id, priv)}
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},
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fx.ResultTags(`name:"security"`),
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),
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),
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)
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} else {
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// fx groups are unordered, but we need to preserve the order of the security transports
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// First of all, we construct the security transports that are needed,
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// and save them to a group call security_unordered.
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for _, s := range cfg.SecurityTransports {
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fxName := fmt.Sprintf(`name:"security_%s"`, s.ID)
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fxopts = append(fxopts, fx.Supply(fx.Annotate(s.ID, fx.ResultTags(fxName))))
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fxopts = append(fxopts,
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fx.Provide(fx.Annotate(
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s.Constructor,
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fx.ParamTags(fxName),
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fx.As(new(sec.SecureTransport)),
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fx.ResultTags(`group:"security_unordered"`),
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)),
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)
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}
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// Then we consume the group security_unordered, and order them by the user's preference.
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fxopts = append(fxopts, fx.Provide(
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fx.Annotate(
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func(secs []sec.SecureTransport) ([]sec.SecureTransport, error) {
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if len(secs) != len(cfg.SecurityTransports) {
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return nil, errors.New("inconsistent length for security transports")
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}
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t := make([]sec.SecureTransport, 0, len(secs))
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for _, s := range cfg.SecurityTransports {
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for _, st := range secs {
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if s.ID != st.ID() {
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continue
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}
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t = append(t, st)
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}
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}
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return t, nil
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},
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fx.ParamTags(`group:"security_unordered"`),
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fx.ResultTags(`name:"security"`),
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)))
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}
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fxopts = append(fxopts, fx.Provide(PrivKeyToStatelessResetKey))
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if cfg.QUICReuse != nil {
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fxopts = append(fxopts, cfg.QUICReuse...)
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} else {
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fxopts = append(fxopts, fx.Provide(quicreuse.NewConnManager)) // TODO: close the ConnManager when shutting down the node
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}
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fxopts = append(fxopts, fx.Invoke(
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fx.Annotate(
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func(tpts []transport.Transport) error {
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for _, t := range tpts {
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if err := swrm.AddTransport(t); err != nil {
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return err
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}
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}
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return nil
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},
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fx.ParamTags(`group:"transport"`),
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)),
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)
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if cfg.Relay {
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fxopts = append(fxopts, fx.Invoke(circuitv2.AddTransport))
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}
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app := fx.New(fxopts...)
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if err := app.Err(); err != nil {
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h.Close()
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return err
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}
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return nil
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}
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// NewNode constructs a new libp2p Host from the Config.
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//
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// This function consumes the config. Do not reuse it (really!).
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func (cfg *Config) NewNode() (host.Host, error) {
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eventBus := eventbus.NewBus(eventbus.WithMetricsTracer(eventbus.NewMetricsTracer(eventbus.WithRegisterer(cfg.PrometheusRegisterer))))
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swrm, err := cfg.makeSwarm(eventBus, !cfg.DisableMetrics)
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if err != nil {
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return nil, err
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}
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h, err := bhost.NewHost(swrm, &bhost.HostOpts{
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EventBus: eventBus,
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ConnManager: cfg.ConnManager,
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AddrsFactory: cfg.AddrsFactory,
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NATManager: cfg.NATManager,
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EnablePing: !cfg.DisablePing,
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UserAgent: cfg.UserAgent,
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ProtocolVersion: cfg.ProtocolVersion,
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EnableHolePunching: cfg.EnableHolePunching,
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HolePunchingOptions: cfg.HolePunchingOptions,
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EnableRelayService: cfg.EnableRelayService,
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RelayServiceOpts: cfg.RelayServiceOpts,
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EnableMetrics: !cfg.DisableMetrics,
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PrometheusRegisterer: cfg.PrometheusRegisterer,
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})
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if err != nil {
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swrm.Close()
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return nil, err
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}
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if cfg.Relay {
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// If we've enabled the relay, we should filter out relay
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// addresses by default.
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//
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// TODO: We shouldn't be doing this here.
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oldFactory := h.AddrsFactory
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h.AddrsFactory = func(addrs []ma.Multiaddr) []ma.Multiaddr {
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return oldFactory(autorelay.Filter(addrs))
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}
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}
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if err := cfg.addTransports(h); err != nil {
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h.Close()
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return nil, err
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}
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// TODO: This method succeeds if listening on one address succeeds. We
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// should probably fail if listening on *any* addr fails.
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if err := h.Network().Listen(cfg.ListenAddrs...); err != nil {
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h.Close()
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return nil, err
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}
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// Configure routing and autorelay
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var router routing.PeerRouting
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if cfg.Routing != nil {
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router, err = cfg.Routing(h)
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if err != nil {
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h.Close()
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return nil, err
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}
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}
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// Note: h.AddrsFactory may be changed by relayFinder, but non-relay version is
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// used by AutoNAT below.
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var ar *autorelay.AutoRelay
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addrF := h.AddrsFactory
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if cfg.EnableAutoRelay {
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if !cfg.Relay {
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h.Close()
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return nil, fmt.Errorf("cannot enable autorelay; relay is not enabled")
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}
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if !cfg.DisableMetrics {
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mt := autorelay.WithMetricsTracer(
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autorelay.NewMetricsTracer(autorelay.WithRegisterer(cfg.PrometheusRegisterer)))
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mtOpts := []autorelay.Option{mt}
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cfg.AutoRelayOpts = append(mtOpts, cfg.AutoRelayOpts...)
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}
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ar, err = autorelay.NewAutoRelay(h, cfg.AutoRelayOpts...)
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if err != nil {
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return nil, err
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}
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}
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autonatOpts := []autonat.Option{
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autonat.UsingAddresses(func() []ma.Multiaddr {
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return addrF(h.AllAddrs())
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}),
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}
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if !cfg.DisableMetrics {
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autonatOpts = append(autonatOpts,
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autonat.WithMetricsTracer(
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autonat.NewMetricsTracer(autonat.WithRegisterer(cfg.PrometheusRegisterer))))
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}
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if cfg.AutoNATConfig.ThrottleInterval != 0 {
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autonatOpts = append(autonatOpts,
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autonat.WithThrottling(cfg.AutoNATConfig.ThrottleGlobalLimit, cfg.AutoNATConfig.ThrottleInterval),
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autonat.WithPeerThrottling(cfg.AutoNATConfig.ThrottlePeerLimit))
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}
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if cfg.AutoNATConfig.EnableService {
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autonatPrivKey, _, err := crypto.GenerateEd25519Key(rand.Reader)
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if err != nil {
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return nil, err
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}
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ps, err := pstoremem.NewPeerstore()
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if err != nil {
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return nil, err
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}
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// Pull out the pieces of the config that we _actually_ care about.
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// Specifically, don't setup things like autorelay, listeners,
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// identify, etc.
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autoNatCfg := Config{
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Transports: cfg.Transports,
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Muxers: cfg.Muxers,
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SecurityTransports: cfg.SecurityTransports,
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Insecure: cfg.Insecure,
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PSK: cfg.PSK,
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ConnectionGater: cfg.ConnectionGater,
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Reporter: cfg.Reporter,
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PeerKey: autonatPrivKey,
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Peerstore: ps,
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}
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dialer, err := autoNatCfg.makeSwarm(eventbus.NewBus(), false)
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if err != nil {
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h.Close()
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return nil, err
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}
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dialerHost := blankhost.NewBlankHost(dialer)
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if err := autoNatCfg.addTransports(dialerHost); err != nil {
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dialerHost.Close()
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h.Close()
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return nil, err
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}
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// NOTE: We're dropping the blank host here but that's fine. It
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// doesn't really _do_ anything and doesn't even need to be
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// closed (as long as we close the underlying network).
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autonatOpts = append(autonatOpts, autonat.EnableService(dialerHost.Network()))
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}
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if cfg.AutoNATConfig.ForceReachability != nil {
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autonatOpts = append(autonatOpts, autonat.WithReachability(*cfg.AutoNATConfig.ForceReachability))
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}
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autonat, err := autonat.New(h, autonatOpts...)
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if err != nil {
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h.Close()
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return nil, fmt.Errorf("cannot enable autorelay; autonat failed to start: %v", err)
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}
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h.SetAutoNat(autonat)
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// start the host background tasks
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h.Start()
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var ho host.Host
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ho = h
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if router != nil {
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ho = routed.Wrap(h, router)
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}
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if ar != nil {
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arh := autorelay.NewAutoRelayHost(ho, ar)
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arh.Start()
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ho = arh
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}
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return ho, nil
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}
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// Option is a libp2p config option that can be given to the libp2p constructor
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// (`libp2p.New`).
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type Option func(cfg *Config) error
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// Apply applies the given options to the config, returning the first error
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// encountered (if any).
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func (cfg *Config) Apply(opts ...Option) error {
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for _, opt := range opts {
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if opt == nil {
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continue
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}
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if err := opt(cfg); err != nil {
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return err
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}
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}
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return nil
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}
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