16b412fb51
In this commit, we avoid logging an error when the links associated with a peer are not found within its termination watcher. We do this to prevent a benign log message as the links have already been removed from the switch.
3168 lines
97 KiB
Go
3168 lines
97 KiB
Go
package main
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import (
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"bytes"
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"context"
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"crypto/rand"
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"crypto/sha256"
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"encoding/hex"
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"fmt"
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"image/color"
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"math/big"
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"net"
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"path/filepath"
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"strconv"
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"sync"
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"sync/atomic"
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"time"
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"github.com/btcsuite/btcd/btcec"
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"github.com/btcsuite/btcd/chaincfg/chainhash"
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"github.com/btcsuite/btcd/connmgr"
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"github.com/btcsuite/btcd/wire"
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"github.com/btcsuite/btcutil"
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"github.com/coreos/bbolt"
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"github.com/go-errors/errors"
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"github.com/lightningnetwork/lightning-onion"
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"github.com/lightningnetwork/lnd/autopilot"
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"github.com/lightningnetwork/lnd/brontide"
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"github.com/lightningnetwork/lnd/channeldb"
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"github.com/lightningnetwork/lnd/contractcourt"
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"github.com/lightningnetwork/lnd/discovery"
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"github.com/lightningnetwork/lnd/htlcswitch"
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"github.com/lightningnetwork/lnd/lncfg"
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"github.com/lightningnetwork/lnd/lnpeer"
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"github.com/lightningnetwork/lnd/lnrpc"
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"github.com/lightningnetwork/lnd/lnwallet"
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"github.com/lightningnetwork/lnd/lnwire"
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"github.com/lightningnetwork/lnd/nat"
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"github.com/lightningnetwork/lnd/routing"
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"github.com/lightningnetwork/lnd/ticker"
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"github.com/lightningnetwork/lnd/tor"
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)
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const (
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// defaultMinPeers is the minimum number of peers nodes should always be
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// connected to.
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defaultMinPeers = 3
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// defaultBackoff is the starting point for exponential backoff for
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// reconnecting to persistent peers.
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defaultBackoff = time.Second
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// maximumBackoff is the largest backoff we will permit when
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// reattempting connections to persistent peers.
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maximumBackoff = time.Hour
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)
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var (
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// ErrPeerNotConnected signals that the server has no connection to the
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// given peer.
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ErrPeerNotConnected = errors.New("peer is not connected")
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// ErrServerShuttingDown indicates that the server is in the process of
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// gracefully exiting.
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ErrServerShuttingDown = errors.New("server is shutting down")
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)
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// server is the main server of the Lightning Network Daemon. The server houses
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// global state pertaining to the wallet, database, and the rpcserver.
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// Additionally, the server is also used as a central messaging bus to interact
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// with any of its companion objects.
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type server struct {
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started int32 // atomic
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shutdown int32 // atomic
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// identityPriv is the private key used to authenticate any incoming
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// connections.
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identityPriv *btcec.PrivateKey
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// nodeSigner is an implementation of the MessageSigner implementation
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// that's backed by the identity private key of the running lnd node.
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nodeSigner *nodeSigner
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// lightningID is the sha256 of the public key corresponding to our
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// long-term identity private key.
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lightningID [32]byte
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// listenAddrs is the list of addresses the server is currently
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// listening on.
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listenAddrs []net.Addr
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// torController is a client that will communicate with a locally
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// running Tor server. This client will handle initiating and
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// authenticating the connection to the Tor server, automatically
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// creating and setting up onion services, etc.
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torController *tor.Controller
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// natTraversal is the specific NAT traversal technique used to
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// automatically set up port forwarding rules in order to advertise to
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// the network that the node is accepting inbound connections.
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natTraversal nat.Traversal
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// lastDetectedIP is the last IP detected by the NAT traversal technique
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// above. This IP will be watched periodically in a goroutine in order
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// to handle dynamic IP changes.
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lastDetectedIP net.IP
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mu sync.RWMutex
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peersByPub map[string]*peer
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inboundPeers map[string]*peer
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outboundPeers map[string]*peer
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peerConnectedListeners map[string][]chan<- lnpeer.Peer
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persistentPeers map[string]struct{}
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persistentPeersBackoff map[string]time.Duration
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persistentConnReqs map[string][]*connmgr.ConnReq
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persistentRetryCancels map[string]chan struct{}
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// ignorePeerTermination tracks peers for which the server has initiated
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// a disconnect. Adding a peer to this map causes the peer termination
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// watcher to short circuit in the event that peers are purposefully
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// disconnected.
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ignorePeerTermination map[*peer]struct{}
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// scheduledPeerConnection maps a pubkey string to a callback that
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// should be executed in the peerTerminationWatcher the prior peer with
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// the same pubkey exits. This allows the server to wait until the
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// prior peer has cleaned up successfully, before adding the new peer
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// intended to replace it.
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scheduledPeerConnection map[string]func()
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cc *chainControl
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fundingMgr *fundingManager
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chanDB *channeldb.DB
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htlcSwitch *htlcswitch.Switch
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invoices *invoiceRegistry
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witnessBeacon contractcourt.WitnessBeacon
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breachArbiter *breachArbiter
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chanRouter *routing.ChannelRouter
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authGossiper *discovery.AuthenticatedGossiper
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utxoNursery *utxoNursery
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chainArb *contractcourt.ChainArbitrator
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sphinx *htlcswitch.OnionProcessor
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connMgr *connmgr.ConnManager
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// globalFeatures feature vector which affects HTLCs and thus are also
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// advertised to other nodes.
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globalFeatures *lnwire.FeatureVector
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// currentNodeAnn is the node announcement that has been broadcast to
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// the network upon startup, if the attributes of the node (us) has
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// changed since last start.
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currentNodeAnn *lnwire.NodeAnnouncement
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// sendDisabled is used to keep track of the disabled flag of the last
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// sent ChannelUpdate from announceChanStatus.
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sentDisabled map[wire.OutPoint]bool
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sentDisabledMtx sync.Mutex
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quit chan struct{}
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wg sync.WaitGroup
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}
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// parseAddr parses an address from its string format to a net.Addr.
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func parseAddr(address string) (net.Addr, error) {
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var (
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host string
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port int
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)
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// Split the address into its host and port components.
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h, p, err := net.SplitHostPort(address)
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if err != nil {
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// If a port wasn't specified, we'll assume the address only
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// contains the host so we'll use the default port.
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host = address
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port = defaultPeerPort
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} else {
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// Otherwise, we'll note both the host and ports.
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host = h
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portNum, err := strconv.Atoi(p)
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if err != nil {
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return nil, err
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}
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port = portNum
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}
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if tor.IsOnionHost(host) {
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return &tor.OnionAddr{OnionService: host, Port: port}, nil
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}
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// If the host is part of a TCP address, we'll use the network
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// specific ResolveTCPAddr function in order to resolve these
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// addresses over Tor in order to prevent leaking your real IP
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// address.
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hostPort := net.JoinHostPort(host, strconv.Itoa(port))
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return cfg.net.ResolveTCPAddr("tcp", hostPort)
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}
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// noiseDial is a factory function which creates a connmgr compliant dialing
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// function by returning a closure which includes the server's identity key.
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func noiseDial(idPriv *btcec.PrivateKey) func(net.Addr) (net.Conn, error) {
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return func(a net.Addr) (net.Conn, error) {
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lnAddr := a.(*lnwire.NetAddress)
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return brontide.Dial(idPriv, lnAddr, cfg.net.Dial)
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}
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}
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// newServer creates a new instance of the server which is to listen using the
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// passed listener address.
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func newServer(listenAddrs []net.Addr, chanDB *channeldb.DB, cc *chainControl,
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privKey *btcec.PrivateKey) (*server, error) {
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var err error
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listeners := make([]net.Listener, len(listenAddrs))
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for i, listenAddr := range listenAddrs {
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// Note: though brontide.NewListener uses ResolveTCPAddr, it
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// doesn't need to call the general lndResolveTCP function
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// since we are resolving a local address.
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listeners[i], err = brontide.NewListener(
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privKey, listenAddr.String(),
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)
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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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globalFeatures := lnwire.NewRawFeatureVector()
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var serializedPubKey [33]byte
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copy(serializedPubKey[:], privKey.PubKey().SerializeCompressed())
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// Initialize the sphinx router, placing it's persistent replay log in
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// the same directory as the channel graph database.
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graphDir := chanDB.Path()
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sharedSecretPath := filepath.Join(graphDir, "sphinxreplay.db")
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replayLog := htlcswitch.NewDecayedLog(sharedSecretPath, cc.chainNotifier)
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sphinxRouter := sphinx.NewRouter(privKey, activeNetParams.Params, replayLog)
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s := &server{
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chanDB: chanDB,
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cc: cc,
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invoices: newInvoiceRegistry(chanDB),
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identityPriv: privKey,
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nodeSigner: newNodeSigner(privKey),
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listenAddrs: listenAddrs,
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// TODO(roasbeef): derive proper onion key based on rotation
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// schedule
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sphinx: htlcswitch.NewOnionProcessor(sphinxRouter),
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lightningID: sha256.Sum256(serializedPubKey[:]),
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persistentPeers: make(map[string]struct{}),
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persistentPeersBackoff: make(map[string]time.Duration),
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persistentConnReqs: make(map[string][]*connmgr.ConnReq),
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persistentRetryCancels: make(map[string]chan struct{}),
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ignorePeerTermination: make(map[*peer]struct{}),
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scheduledPeerConnection: make(map[string]func()),
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peersByPub: make(map[string]*peer),
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inboundPeers: make(map[string]*peer),
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outboundPeers: make(map[string]*peer),
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peerConnectedListeners: make(map[string][]chan<- lnpeer.Peer),
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sentDisabled: make(map[wire.OutPoint]bool),
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globalFeatures: lnwire.NewFeatureVector(globalFeatures,
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lnwire.GlobalFeatures),
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quit: make(chan struct{}),
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}
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s.witnessBeacon = &preimageBeacon{
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invoices: s.invoices,
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wCache: chanDB.NewWitnessCache(),
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subscribers: make(map[uint64]*preimageSubscriber),
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}
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// If the debug HTLC flag is on, then we invoice a "master debug"
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// invoice which all outgoing payments will be sent and all incoming
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// HTLCs with the debug R-Hash immediately settled.
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if cfg.DebugHTLC {
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kiloCoin := btcutil.Amount(btcutil.SatoshiPerBitcoin * 1000)
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s.invoices.AddDebugInvoice(kiloCoin, *debugPre)
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srvrLog.Debugf("Debug HTLC invoice inserted, preimage=%x, hash=%x",
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debugPre[:], debugHash[:])
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}
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_, currentHeight, err := s.cc.chainIO.GetBestBlock()
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if err != nil {
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return nil, err
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}
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s.htlcSwitch, err = htlcswitch.New(htlcswitch.Config{
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DB: chanDB,
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SelfKey: s.identityPriv.PubKey(),
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LocalChannelClose: func(pubKey []byte,
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request *htlcswitch.ChanClose) {
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peer, err := s.FindPeerByPubStr(string(pubKey))
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if err != nil {
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srvrLog.Errorf("unable to close channel, peer"+
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" with %v id can't be found: %v",
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pubKey, err,
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)
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return
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}
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select {
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case peer.localCloseChanReqs <- request:
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srvrLog.Infof("Local close channel request "+
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"delivered to peer: %x", pubKey[:])
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case <-peer.quit:
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srvrLog.Errorf("Unable to deliver local close "+
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"channel request to peer %x, err: %v",
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pubKey[:], err)
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}
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},
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FwdingLog: chanDB.ForwardingLog(),
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SwitchPackager: channeldb.NewSwitchPackager(),
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ExtractErrorEncrypter: s.sphinx.ExtractErrorEncrypter,
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FetchLastChannelUpdate: s.fetchLastChanUpdate(),
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Notifier: s.cc.chainNotifier,
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FwdEventTicker: ticker.New(
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htlcswitch.DefaultFwdEventInterval),
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LogEventTicker: ticker.New(
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htlcswitch.DefaultLogInterval),
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}, uint32(currentHeight))
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if err != nil {
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return nil, err
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}
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// If enabled, use either UPnP or NAT-PMP to automatically configure
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// port forwarding for users behind a NAT.
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if cfg.NAT {
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srvrLog.Info("Scanning local network for a UPnP enabled device")
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discoveryTimeout := time.Duration(10 * time.Second)
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ctx, cancel := context.WithTimeout(
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context.Background(), discoveryTimeout,
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)
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defer cancel()
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upnp, err := nat.DiscoverUPnP(ctx)
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if err == nil {
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s.natTraversal = upnp
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} else {
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// If we were not able to discover a UPnP enabled device
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// on the local network, we'll fall back to attempting
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// to discover a NAT-PMP enabled device.
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srvrLog.Errorf("Unable to discover a UPnP enabled "+
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"device on the local network: %v", err)
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srvrLog.Info("Scanning local network for a NAT-PMP " +
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"enabled device")
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pmp, err := nat.DiscoverPMP(discoveryTimeout)
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if err != nil {
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err := fmt.Errorf("Unable to discover a "+
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"NAT-PMP enabled device on the local "+
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"network: %v", err)
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srvrLog.Error(err)
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return nil, err
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}
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s.natTraversal = pmp
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}
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}
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// If we were requested to automatically configure port forwarding,
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// we'll use the ports that the server will be listening on.
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externalIPStrings := make([]string, len(cfg.ExternalIPs))
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for idx, ip := range cfg.ExternalIPs {
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externalIPStrings[idx] = ip.String()
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}
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if s.natTraversal != nil {
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listenPorts := make([]uint16, 0, len(listenAddrs))
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for _, listenAddr := range listenAddrs {
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// At this point, the listen addresses should have
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// already been normalized, so it's safe to ignore the
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// errors.
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_, portStr, _ := net.SplitHostPort(listenAddr.String())
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port, _ := strconv.Atoi(portStr)
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listenPorts = append(listenPorts, uint16(port))
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}
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ips, err := s.configurePortForwarding(listenPorts...)
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if err != nil {
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srvrLog.Errorf("Unable to automatically set up port "+
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"forwarding using %s: %v",
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s.natTraversal.Name(), err)
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} else {
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srvrLog.Infof("Automatically set up port forwarding "+
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"using %s to advertise external IP",
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s.natTraversal.Name())
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externalIPStrings = append(externalIPStrings, ips...)
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}
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}
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// If external IP addresses have been specified, add those to the list
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// of this server's addresses.
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externalIPs, err := lncfg.NormalizeAddresses(
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externalIPStrings, strconv.Itoa(defaultPeerPort),
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cfg.net.ResolveTCPAddr,
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)
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if err != nil {
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return nil, err
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}
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selfAddrs := make([]net.Addr, 0, len(externalIPs))
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for _, ip := range externalIPs {
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selfAddrs = append(selfAddrs, ip)
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}
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// If we were requested to route connections through Tor and to
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// automatically create an onion service, we'll initiate our Tor
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// controller and establish a connection to the Tor server.
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//
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// NOTE: v3 onion services cannot be created automatically yet. In the
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// future, this will be expanded to do so.
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if cfg.Tor.Active && cfg.Tor.V2 {
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s.torController = tor.NewController(cfg.Tor.Control)
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}
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chanGraph := chanDB.ChannelGraph()
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|
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// Parse node color from configuration.
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color, err := parseHexColor(cfg.Color)
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if err != nil {
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srvrLog.Errorf("unable to parse color: %v\n", err)
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return nil, err
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}
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|
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// If no alias is provided, default to first 10 characters of public key
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alias := cfg.Alias
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if alias == "" {
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alias = hex.EncodeToString(serializedPubKey[:10])
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}
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nodeAlias, err := lnwire.NewNodeAlias(alias)
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if err != nil {
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return nil, err
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}
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selfNode := &channeldb.LightningNode{
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HaveNodeAnnouncement: true,
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LastUpdate: time.Now(),
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Addresses: selfAddrs,
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Alias: nodeAlias.String(),
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Features: s.globalFeatures,
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Color: color,
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}
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copy(selfNode.PubKeyBytes[:], privKey.PubKey().SerializeCompressed())
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// If our information has changed since our last boot, then we'll
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// re-sign our node announcement so a fresh authenticated version of it
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// can be propagated throughout the network upon startup.
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//
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// TODO(roasbeef): don't always set timestamp above to _now.
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nodeAnn := &lnwire.NodeAnnouncement{
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Timestamp: uint32(selfNode.LastUpdate.Unix()),
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Addresses: selfNode.Addresses,
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NodeID: selfNode.PubKeyBytes,
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Alias: nodeAlias,
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Features: selfNode.Features.RawFeatureVector,
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RGBColor: color,
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}
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authSig, err := discovery.SignAnnouncement(
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s.nodeSigner, s.identityPriv.PubKey(), nodeAnn,
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)
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if err != nil {
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return nil, fmt.Errorf("unable to generate signature for "+
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"self node announcement: %v", err)
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}
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selfNode.AuthSigBytes = authSig.Serialize()
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s.currentNodeAnn = nodeAnn
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if err := chanGraph.SetSourceNode(selfNode); err != nil {
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return nil, fmt.Errorf("can't set self node: %v", err)
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}
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nodeAnn.Signature, err = lnwire.NewSigFromRawSignature(selfNode.AuthSigBytes)
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if err != nil {
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return nil, err
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}
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s.chanRouter, err = routing.New(routing.Config{
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Graph: chanGraph,
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Chain: cc.chainIO,
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ChainView: cc.chainView,
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SendToSwitch: func(firstHop lnwire.ShortChannelID,
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htlcAdd *lnwire.UpdateAddHTLC,
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circuit *sphinx.Circuit) ([32]byte, error) {
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|
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// Using the created circuit, initialize the error
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|
// decrypter so we can parse+decode any failures
|
|
// incurred by this payment within the switch.
|
|
errorDecryptor := &htlcswitch.SphinxErrorDecrypter{
|
|
OnionErrorDecrypter: sphinx.NewOnionErrorDecrypter(circuit),
|
|
}
|
|
|
|
return s.htlcSwitch.SendHTLC(
|
|
firstHop, htlcAdd, errorDecryptor,
|
|
)
|
|
},
|
|
ChannelPruneExpiry: time.Duration(time.Hour * 24 * 14),
|
|
GraphPruneInterval: time.Duration(time.Hour),
|
|
QueryBandwidth: func(edge *channeldb.ChannelEdgeInfo) lnwire.MilliSatoshi {
|
|
// If we aren't on either side of this edge, then we'll
|
|
// just thread through the capacity of the edge as we
|
|
// know it.
|
|
if !bytes.Equal(edge.NodeKey1Bytes[:], selfNode.PubKeyBytes[:]) &&
|
|
!bytes.Equal(edge.NodeKey2Bytes[:], selfNode.PubKeyBytes[:]) {
|
|
|
|
return lnwire.NewMSatFromSatoshis(edge.Capacity)
|
|
}
|
|
|
|
cid := lnwire.NewChanIDFromOutPoint(&edge.ChannelPoint)
|
|
link, err := s.htlcSwitch.GetLink(cid)
|
|
if err != nil {
|
|
// If the link isn't online, then we'll report
|
|
// that it has zero bandwidth to the router.
|
|
return 0
|
|
}
|
|
|
|
// If the link is found within the switch, but it isn't
|
|
// yet eligible to forward any HTLCs, then we'll treat
|
|
// it as if it isn't online in the first place.
|
|
if !link.EligibleToForward() {
|
|
return 0
|
|
}
|
|
|
|
// Otherwise, we'll return the current best estimate
|
|
// for the available bandwidth for the link.
|
|
return link.Bandwidth()
|
|
},
|
|
})
|
|
if err != nil {
|
|
return nil, fmt.Errorf("can't create router: %v", err)
|
|
}
|
|
|
|
s.authGossiper, err = discovery.New(discovery.Config{
|
|
Router: s.chanRouter,
|
|
Notifier: s.cc.chainNotifier,
|
|
ChainHash: *activeNetParams.GenesisHash,
|
|
Broadcast: s.BroadcastMessage,
|
|
ChanSeries: &chanSeries{s.chanDB.ChannelGraph()},
|
|
SendToPeer: s.SendToPeer,
|
|
FindPeer: func(pub *btcec.PublicKey) (lnpeer.Peer, error) {
|
|
return s.FindPeer(pub)
|
|
},
|
|
NotifyWhenOnline: s.NotifyWhenOnline,
|
|
ProofMatureDelta: 0,
|
|
TrickleDelay: time.Millisecond * time.Duration(cfg.TrickleDelay),
|
|
RetransmitDelay: time.Minute * 30,
|
|
DB: chanDB,
|
|
AnnSigner: s.nodeSigner,
|
|
},
|
|
s.identityPriv.PubKey(),
|
|
)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
utxnStore, err := newNurseryStore(activeNetParams.GenesisHash, chanDB)
|
|
if err != nil {
|
|
srvrLog.Errorf("unable to create nursery store: %v", err)
|
|
return nil, err
|
|
}
|
|
|
|
s.utxoNursery = newUtxoNursery(&NurseryConfig{
|
|
ChainIO: cc.chainIO,
|
|
ConfDepth: 1,
|
|
DB: chanDB,
|
|
Estimator: cc.feeEstimator,
|
|
GenSweepScript: func() ([]byte, error) {
|
|
return newSweepPkScript(cc.wallet)
|
|
},
|
|
Notifier: cc.chainNotifier,
|
|
PublishTransaction: cc.wallet.PublishTransaction,
|
|
Signer: cc.wallet.Cfg.Signer,
|
|
Store: utxnStore,
|
|
})
|
|
|
|
// Construct a closure that wraps the htlcswitch's CloseLink method.
|
|
closeLink := func(chanPoint *wire.OutPoint,
|
|
closureType htlcswitch.ChannelCloseType) {
|
|
// TODO(conner): Properly respect the update and error channels
|
|
// returned by CloseLink.
|
|
s.htlcSwitch.CloseLink(chanPoint, closureType, 0)
|
|
}
|
|
|
|
// We will use the following channel to reliably hand off contract
|
|
// breach events from the ChannelArbitrator to the breachArbiter,
|
|
contractBreaches := make(chan *ContractBreachEvent, 1)
|
|
|
|
s.chainArb = contractcourt.NewChainArbitrator(contractcourt.ChainArbitratorConfig{
|
|
ChainHash: *activeNetParams.GenesisHash,
|
|
// TODO(roasbeef): properly configure
|
|
// * needs to be << or specified final hop time delta
|
|
BroadcastDelta: defaultBroadcastDelta,
|
|
NewSweepAddr: func() ([]byte, error) {
|
|
return newSweepPkScript(cc.wallet)
|
|
},
|
|
PublishTx: cc.wallet.PublishTransaction,
|
|
DeliverResolutionMsg: func(msgs ...contractcourt.ResolutionMsg) error {
|
|
for _, msg := range msgs {
|
|
err := s.htlcSwitch.ProcessContractResolution(msg)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
},
|
|
IncubateOutputs: func(chanPoint wire.OutPoint,
|
|
commitRes *lnwallet.CommitOutputResolution,
|
|
outHtlcRes *lnwallet.OutgoingHtlcResolution,
|
|
inHtlcRes *lnwallet.IncomingHtlcResolution) error {
|
|
|
|
var (
|
|
inRes []lnwallet.IncomingHtlcResolution
|
|
outRes []lnwallet.OutgoingHtlcResolution
|
|
)
|
|
if inHtlcRes != nil {
|
|
inRes = append(inRes, *inHtlcRes)
|
|
}
|
|
if outHtlcRes != nil {
|
|
outRes = append(outRes, *outHtlcRes)
|
|
}
|
|
|
|
return s.utxoNursery.IncubateOutputs(
|
|
chanPoint, commitRes, outRes, inRes,
|
|
)
|
|
},
|
|
PreimageDB: s.witnessBeacon,
|
|
Notifier: cc.chainNotifier,
|
|
Signer: cc.wallet.Cfg.Signer,
|
|
FeeEstimator: cc.feeEstimator,
|
|
ChainIO: cc.chainIO,
|
|
MarkLinkInactive: func(chanPoint wire.OutPoint) error {
|
|
chanID := lnwire.NewChanIDFromOutPoint(&chanPoint)
|
|
s.htlcSwitch.RemoveLink(chanID)
|
|
return nil
|
|
},
|
|
IsOurAddress: func(addr btcutil.Address) bool {
|
|
_, err := cc.wallet.GetPrivKey(addr)
|
|
return err == nil
|
|
},
|
|
ContractBreach: func(chanPoint wire.OutPoint,
|
|
breachRet *lnwallet.BreachRetribution) error {
|
|
event := &ContractBreachEvent{
|
|
ChanPoint: chanPoint,
|
|
ProcessACK: make(chan error, 1),
|
|
BreachRetribution: breachRet,
|
|
}
|
|
|
|
// Send the contract breach event to the breachArbiter.
|
|
select {
|
|
case contractBreaches <- event:
|
|
case <-s.quit:
|
|
return ErrServerShuttingDown
|
|
}
|
|
|
|
// Wait for the breachArbiter to ACK the event.
|
|
select {
|
|
case err := <-event.ProcessACK:
|
|
return err
|
|
case <-s.quit:
|
|
return ErrServerShuttingDown
|
|
}
|
|
},
|
|
DisableChannel: func(op wire.OutPoint) error {
|
|
return s.announceChanStatus(op, true)
|
|
},
|
|
}, chanDB)
|
|
|
|
s.breachArbiter = newBreachArbiter(&BreachConfig{
|
|
CloseLink: closeLink,
|
|
DB: chanDB,
|
|
Estimator: s.cc.feeEstimator,
|
|
GenSweepScript: func() ([]byte, error) {
|
|
return newSweepPkScript(cc.wallet)
|
|
},
|
|
Notifier: cc.chainNotifier,
|
|
PublishTransaction: cc.wallet.PublishTransaction,
|
|
ContractBreaches: contractBreaches,
|
|
Signer: cc.wallet.Cfg.Signer,
|
|
Store: newRetributionStore(chanDB),
|
|
})
|
|
|
|
// Select the configuration and furnding parameters for Bitcoin or
|
|
// Litecoin, depending on the primary registered chain.
|
|
primaryChain := registeredChains.PrimaryChain()
|
|
chainCfg := cfg.Bitcoin
|
|
minRemoteDelay := minBtcRemoteDelay
|
|
maxRemoteDelay := maxBtcRemoteDelay
|
|
if primaryChain == litecoinChain {
|
|
chainCfg = cfg.Litecoin
|
|
minRemoteDelay = minLtcRemoteDelay
|
|
maxRemoteDelay = maxLtcRemoteDelay
|
|
}
|
|
|
|
nodeSigner := newNodeSigner(privKey)
|
|
var chanIDSeed [32]byte
|
|
if _, err := rand.Read(chanIDSeed[:]); err != nil {
|
|
return nil, err
|
|
}
|
|
s.fundingMgr, err = newFundingManager(fundingConfig{
|
|
IDKey: privKey.PubKey(),
|
|
Wallet: cc.wallet,
|
|
PublishTransaction: cc.wallet.PublishTransaction,
|
|
Notifier: cc.chainNotifier,
|
|
FeeEstimator: cc.feeEstimator,
|
|
SignMessage: func(pubKey *btcec.PublicKey,
|
|
msg []byte) (*btcec.Signature, error) {
|
|
|
|
if pubKey.IsEqual(privKey.PubKey()) {
|
|
return nodeSigner.SignMessage(pubKey, msg)
|
|
}
|
|
|
|
return cc.msgSigner.SignMessage(pubKey, msg)
|
|
},
|
|
CurrentNodeAnnouncement: func() (lnwire.NodeAnnouncement, error) {
|
|
return s.genNodeAnnouncement(true)
|
|
},
|
|
SendAnnouncement: func(msg lnwire.Message) chan error {
|
|
return s.authGossiper.ProcessLocalAnnouncement(
|
|
msg, privKey.PubKey(),
|
|
)
|
|
},
|
|
NotifyWhenOnline: s.NotifyWhenOnline,
|
|
TempChanIDSeed: chanIDSeed,
|
|
FindChannel: func(chanID lnwire.ChannelID) (*lnwallet.LightningChannel, error) {
|
|
dbChannels, err := chanDB.FetchAllChannels()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
for _, channel := range dbChannels {
|
|
if chanID.IsChanPoint(&channel.FundingOutpoint) {
|
|
return lnwallet.NewLightningChannel(
|
|
cc.signer, s.witnessBeacon,
|
|
channel,
|
|
)
|
|
}
|
|
}
|
|
|
|
return nil, fmt.Errorf("unable to find channel")
|
|
},
|
|
DefaultRoutingPolicy: cc.routingPolicy,
|
|
NumRequiredConfs: func(chanAmt btcutil.Amount,
|
|
pushAmt lnwire.MilliSatoshi) uint16 {
|
|
// For large channels we increase the number
|
|
// of confirmations we require for the
|
|
// channel to be considered open. As it is
|
|
// always the responder that gets to choose
|
|
// value, the pushAmt is value being pushed
|
|
// to us. This means we have more to lose
|
|
// in the case this gets re-orged out, and
|
|
// we will require more confirmations before
|
|
// we consider it open.
|
|
// TODO(halseth): Use Litecoin params in case
|
|
// of LTC channels.
|
|
|
|
// In case the user has explicitly specified
|
|
// a default value for the number of
|
|
// confirmations, we use it.
|
|
defaultConf := uint16(chainCfg.DefaultNumChanConfs)
|
|
if defaultConf != 0 {
|
|
return defaultConf
|
|
}
|
|
|
|
// If not we return a value scaled linearly
|
|
// between 3 and 6, depending on channel size.
|
|
// TODO(halseth): Use 1 as minimum?
|
|
minConf := uint64(3)
|
|
maxConf := uint64(6)
|
|
maxChannelSize := uint64(
|
|
lnwire.NewMSatFromSatoshis(maxFundingAmount))
|
|
stake := lnwire.NewMSatFromSatoshis(chanAmt) + pushAmt
|
|
conf := maxConf * uint64(stake) / maxChannelSize
|
|
if conf < minConf {
|
|
conf = minConf
|
|
}
|
|
if conf > maxConf {
|
|
conf = maxConf
|
|
}
|
|
return uint16(conf)
|
|
},
|
|
RequiredRemoteDelay: func(chanAmt btcutil.Amount) uint16 {
|
|
// We scale the remote CSV delay (the time the
|
|
// remote have to claim funds in case of a unilateral
|
|
// close) linearly from minRemoteDelay blocks
|
|
// for small channels, to maxRemoteDelay blocks
|
|
// for channels of size maxFundingAmount.
|
|
// TODO(halseth): Litecoin parameter for LTC.
|
|
|
|
// In case the user has explicitly specified
|
|
// a default value for the remote delay, we
|
|
// use it.
|
|
defaultDelay := uint16(chainCfg.DefaultRemoteDelay)
|
|
if defaultDelay > 0 {
|
|
return defaultDelay
|
|
}
|
|
|
|
// If not we scale according to channel size.
|
|
delay := uint16(btcutil.Amount(maxRemoteDelay) *
|
|
chanAmt / maxFundingAmount)
|
|
if delay < minRemoteDelay {
|
|
delay = minRemoteDelay
|
|
}
|
|
if delay > maxRemoteDelay {
|
|
delay = maxRemoteDelay
|
|
}
|
|
return delay
|
|
},
|
|
WatchNewChannel: func(channel *channeldb.OpenChannel,
|
|
peerKey *btcec.PublicKey) error {
|
|
|
|
// First, we'll mark this new peer as a persistent peer
|
|
// for re-connection purposes.
|
|
s.mu.Lock()
|
|
pubStr := string(peerKey.SerializeCompressed())
|
|
s.persistentPeers[pubStr] = struct{}{}
|
|
s.mu.Unlock()
|
|
|
|
// With that taken care of, we'll send this channel to
|
|
// the chain arb so it can react to on-chain events.
|
|
return s.chainArb.WatchNewChannel(channel)
|
|
},
|
|
ReportShortChanID: func(chanPoint wire.OutPoint) error {
|
|
cid := lnwire.NewChanIDFromOutPoint(&chanPoint)
|
|
return s.htlcSwitch.UpdateShortChanID(cid)
|
|
},
|
|
RequiredRemoteChanReserve: func(chanAmt,
|
|
dustLimit btcutil.Amount) btcutil.Amount {
|
|
|
|
// By default, we'll require the remote peer to maintain
|
|
// at least 1% of the total channel capacity at all
|
|
// times. If this value ends up dipping below the dust
|
|
// limit, then we'll use the dust limit itself as the
|
|
// reserve as required by BOLT #2.
|
|
reserve := chanAmt / 100
|
|
if reserve < dustLimit {
|
|
reserve = dustLimit
|
|
}
|
|
|
|
return reserve
|
|
},
|
|
RequiredRemoteMaxValue: func(chanAmt btcutil.Amount) lnwire.MilliSatoshi {
|
|
// By default, we'll allow the remote peer to fully
|
|
// utilize the full bandwidth of the channel, minus our
|
|
// required reserve.
|
|
reserve := lnwire.NewMSatFromSatoshis(chanAmt / 100)
|
|
return lnwire.NewMSatFromSatoshis(chanAmt) - reserve
|
|
},
|
|
RequiredRemoteMaxHTLCs: func(chanAmt btcutil.Amount) uint16 {
|
|
// By default, we'll permit them to utilize the full
|
|
// channel bandwidth.
|
|
return uint16(lnwallet.MaxHTLCNumber / 2)
|
|
},
|
|
ZombieSweeperInterval: 1 * time.Minute,
|
|
ReservationTimeout: 10 * time.Minute,
|
|
MinChanSize: btcutil.Amount(cfg.MinChanSize),
|
|
})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Create the connection manager which will be responsible for
|
|
// maintaining persistent outbound connections and also accepting new
|
|
// incoming connections
|
|
cmgr, err := connmgr.New(&connmgr.Config{
|
|
Listeners: listeners,
|
|
OnAccept: s.InboundPeerConnected,
|
|
RetryDuration: time.Second * 5,
|
|
TargetOutbound: 100,
|
|
Dial: noiseDial(s.identityPriv),
|
|
OnConnection: s.OutboundPeerConnected,
|
|
})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
s.connMgr = cmgr
|
|
|
|
return s, nil
|
|
}
|
|
|
|
// Started returns true if the server has been started, and false otherwise.
|
|
// NOTE: This function is safe for concurrent access.
|
|
func (s *server) Started() bool {
|
|
return atomic.LoadInt32(&s.started) != 0
|
|
}
|
|
|
|
// Start starts the main daemon server, all requested listeners, and any helper
|
|
// goroutines.
|
|
// NOTE: This function is safe for concurrent access.
|
|
func (s *server) Start() error {
|
|
// Already running?
|
|
if !atomic.CompareAndSwapInt32(&s.started, 0, 1) {
|
|
return nil
|
|
}
|
|
|
|
if s.torController != nil {
|
|
if err := s.initTorController(); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
if s.natTraversal != nil {
|
|
s.wg.Add(1)
|
|
go s.watchExternalIP()
|
|
}
|
|
|
|
// Start the notification server. This is used so channel management
|
|
// goroutines can be notified when a funding transaction reaches a
|
|
// sufficient number of confirmations, or when the input for the
|
|
// funding transaction is spent in an attempt at an uncooperative close
|
|
// by the counterparty.
|
|
if err := s.cc.chainNotifier.Start(); err != nil {
|
|
return err
|
|
}
|
|
if err := s.sphinx.Start(); err != nil {
|
|
return err
|
|
}
|
|
if err := s.htlcSwitch.Start(); err != nil {
|
|
return err
|
|
}
|
|
if err := s.utxoNursery.Start(); err != nil {
|
|
return err
|
|
}
|
|
if err := s.chainArb.Start(); err != nil {
|
|
return err
|
|
}
|
|
if err := s.breachArbiter.Start(); err != nil {
|
|
return err
|
|
}
|
|
if err := s.authGossiper.Start(); err != nil {
|
|
return err
|
|
}
|
|
if err := s.chanRouter.Start(); err != nil {
|
|
return err
|
|
}
|
|
if err := s.fundingMgr.Start(); err != nil {
|
|
return err
|
|
}
|
|
s.connMgr.Start()
|
|
|
|
if err := s.invoices.Start(); err != nil {
|
|
return err
|
|
}
|
|
|
|
// With all the relevant sub-systems started, we'll now attempt to
|
|
// establish persistent connections to our direct channel collaborators
|
|
// within the network. Before doing so however, we'll prune our set of
|
|
// link nodes found within the database to ensure we don't reconnect to
|
|
// any nodes we no longer have open channels with.
|
|
if err := s.chanDB.PruneLinkNodes(); err != nil {
|
|
return err
|
|
}
|
|
if err := s.establishPersistentConnections(); err != nil {
|
|
return err
|
|
}
|
|
|
|
// If network bootstrapping hasn't been disabled, then we'll configure
|
|
// the set of active bootstrappers, and launch a dedicated goroutine to
|
|
// maintain a set of persistent connections.
|
|
if !cfg.NoNetBootstrap && !(cfg.Bitcoin.SimNet || cfg.Litecoin.SimNet) &&
|
|
!(cfg.Bitcoin.RegTest || cfg.Litecoin.RegTest) {
|
|
|
|
bootstrappers, err := initNetworkBootstrappers(s)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
s.wg.Add(1)
|
|
go s.peerBootstrapper(defaultMinPeers, bootstrappers)
|
|
} else {
|
|
srvrLog.Infof("Auto peer bootstrapping is disabled")
|
|
}
|
|
|
|
// Start a goroutine that will periodically send out ChannelUpdates
|
|
// based on a channel's status.
|
|
s.wg.Add(1)
|
|
go s.watchChannelStatus()
|
|
|
|
return nil
|
|
}
|
|
|
|
// Stop gracefully shutsdown the main daemon server. This function will signal
|
|
// any active goroutines, or helper objects to exit, then blocks until they've
|
|
// all successfully exited. Additionally, any/all listeners are closed.
|
|
// NOTE: This function is safe for concurrent access.
|
|
func (s *server) Stop() error {
|
|
// Bail if we're already shutting down.
|
|
if !atomic.CompareAndSwapInt32(&s.shutdown, 0, 1) {
|
|
return nil
|
|
}
|
|
|
|
close(s.quit)
|
|
|
|
if s.torController != nil {
|
|
s.torController.Stop()
|
|
}
|
|
|
|
// Shutdown the wallet, funding manager, and the rpc server.
|
|
s.cc.chainNotifier.Stop()
|
|
s.chanRouter.Stop()
|
|
s.htlcSwitch.Stop()
|
|
s.sphinx.Stop()
|
|
s.utxoNursery.Stop()
|
|
s.breachArbiter.Stop()
|
|
s.authGossiper.Stop()
|
|
s.chainArb.Stop()
|
|
s.cc.wallet.Shutdown()
|
|
s.cc.chainView.Stop()
|
|
s.connMgr.Stop()
|
|
s.cc.feeEstimator.Stop()
|
|
s.invoices.Stop()
|
|
s.fundingMgr.Stop()
|
|
|
|
// Disconnect from each active peers to ensure that
|
|
// peerTerminationWatchers signal completion to each peer.
|
|
for _, peer := range s.Peers() {
|
|
s.DisconnectPeer(peer.addr.IdentityKey)
|
|
}
|
|
|
|
// Wait for all lingering goroutines to quit.
|
|
s.wg.Wait()
|
|
|
|
return nil
|
|
}
|
|
|
|
// Stopped returns true if the server has been instructed to shutdown.
|
|
// NOTE: This function is safe for concurrent access.
|
|
func (s *server) Stopped() bool {
|
|
return atomic.LoadInt32(&s.shutdown) != 0
|
|
}
|
|
|
|
// configurePortForwarding attempts to set up port forwarding for the diffrent
|
|
// ports that the server will be listening on.
|
|
//
|
|
// NOTE: This should only be used when using some kind of NAT traversal to
|
|
// automatically set up forwarding rules.
|
|
func (s *server) configurePortForwarding(ports ...uint16) ([]string, error) {
|
|
ip, err := s.natTraversal.ExternalIP()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
s.lastDetectedIP = ip
|
|
|
|
externalIPs := make([]string, 0, len(ports))
|
|
for _, port := range ports {
|
|
if err := s.natTraversal.AddPortMapping(port); err != nil {
|
|
srvrLog.Debugf("Unable to forward port %d: %v", port, err)
|
|
continue
|
|
}
|
|
|
|
hostIP := fmt.Sprintf("%v:%d", ip, port)
|
|
externalIPs = append(externalIPs, hostIP)
|
|
}
|
|
|
|
return externalIPs, nil
|
|
}
|
|
|
|
// removePortForwarding attempts to clear the forwarding rules for the different
|
|
// ports the server is currently listening on.
|
|
//
|
|
// NOTE: This should only be used when using some kind of NAT traversal to
|
|
// automatically set up forwarding rules.
|
|
func (s *server) removePortForwarding() {
|
|
forwardedPorts := s.natTraversal.ForwardedPorts()
|
|
for _, port := range forwardedPorts {
|
|
if err := s.natTraversal.DeletePortMapping(port); err != nil {
|
|
srvrLog.Errorf("Unable to remove forwarding rules for "+
|
|
"port %d: %v", port, err)
|
|
}
|
|
}
|
|
}
|
|
|
|
// watchExternalIP continously checks for an updated external IP address every
|
|
// 15 minutes. Once a new IP address has been detected, it will automatically
|
|
// handle port forwarding rules and send updated node announcements to the
|
|
// currently connected peers.
|
|
//
|
|
// NOTE: This MUST be run as a goroutine.
|
|
func (s *server) watchExternalIP() {
|
|
defer s.wg.Done()
|
|
|
|
// Before exiting, we'll make sure to remove the forwarding rules set
|
|
// up by the server.
|
|
defer s.removePortForwarding()
|
|
|
|
// Keep track of the external IPs set by the user to avoid replacing
|
|
// them when detecting a new IP.
|
|
ipsSetByUser := make(map[string]struct{})
|
|
for _, ip := range cfg.ExternalIPs {
|
|
ipsSetByUser[ip.String()] = struct{}{}
|
|
}
|
|
|
|
forwardedPorts := s.natTraversal.ForwardedPorts()
|
|
|
|
ticker := time.NewTicker(15 * time.Minute)
|
|
defer ticker.Stop()
|
|
out:
|
|
for {
|
|
select {
|
|
case <-ticker.C:
|
|
// We'll start off by making sure a new IP address has
|
|
// been detected.
|
|
ip, err := s.natTraversal.ExternalIP()
|
|
if err != nil {
|
|
srvrLog.Debugf("Unable to retrieve the "+
|
|
"external IP address: %v", err)
|
|
continue
|
|
}
|
|
|
|
if ip.Equal(s.lastDetectedIP) {
|
|
continue
|
|
}
|
|
|
|
srvrLog.Infof("Detected new external IP address %s", ip)
|
|
|
|
// Next, we'll craft the new addresses that will be
|
|
// included in the new node announcement and advertised
|
|
// to the network. Each address will consist of the new
|
|
// IP detected and one of the currently advertised
|
|
// ports.
|
|
var newAddrs []net.Addr
|
|
for _, port := range forwardedPorts {
|
|
hostIP := fmt.Sprintf("%v:%d", ip, port)
|
|
addr, err := net.ResolveTCPAddr("tcp", hostIP)
|
|
if err != nil {
|
|
srvrLog.Debugf("Unable to resolve "+
|
|
"host %v: %v", addr, err)
|
|
continue
|
|
}
|
|
|
|
newAddrs = append(newAddrs, addr)
|
|
}
|
|
|
|
// Skip the update if we weren't able to resolve any of
|
|
// the new addresses.
|
|
if len(newAddrs) == 0 {
|
|
srvrLog.Debug("Skipping node announcement " +
|
|
"update due to not being able to " +
|
|
"resolve any new addresses")
|
|
continue
|
|
}
|
|
|
|
// Now, we'll need to update the addresses in our node's
|
|
// announcement in order to propogate the update
|
|
// throughout the network. We'll only include addresses
|
|
// that have a different IP from the previous one, as
|
|
// the previous IP is no longer valid.
|
|
currentNodeAnn, err := s.genNodeAnnouncement(false)
|
|
if err != nil {
|
|
srvrLog.Debugf("Unable to retrieve current "+
|
|
"node announcement: %v", err)
|
|
continue
|
|
}
|
|
for _, addr := range currentNodeAnn.Addresses {
|
|
host, _, err := net.SplitHostPort(addr.String())
|
|
if err != nil {
|
|
srvrLog.Debugf("Unable to determine "+
|
|
"host from address %v: %v",
|
|
addr, err)
|
|
continue
|
|
}
|
|
|
|
// We'll also make sure to include external IPs
|
|
// set manually by the user.
|
|
_, setByUser := ipsSetByUser[addr.String()]
|
|
if setByUser || host != s.lastDetectedIP.String() {
|
|
newAddrs = append(newAddrs, addr)
|
|
}
|
|
}
|
|
|
|
// Then, we'll generate a new timestamped node
|
|
// announcement with the updated addresses and broadcast
|
|
// it to our peers.
|
|
newNodeAnn, err := s.genNodeAnnouncement(
|
|
true, lnwire.UpdateNodeAnnAddrs(newAddrs),
|
|
)
|
|
if err != nil {
|
|
srvrLog.Debugf("Unable to generate new node "+
|
|
"announcement: %v", err)
|
|
continue
|
|
}
|
|
|
|
err = s.BroadcastMessage(nil, &newNodeAnn)
|
|
if err != nil {
|
|
srvrLog.Debugf("Unable to broadcast new node "+
|
|
"announcement to peers: %v", err)
|
|
continue
|
|
}
|
|
|
|
// Finally, update the last IP seen to the current one.
|
|
s.lastDetectedIP = ip
|
|
case <-s.quit:
|
|
break out
|
|
}
|
|
}
|
|
}
|
|
|
|
// initNetworkBootstrappers initializes a set of network peer bootstrappers
|
|
// based on the server, and currently active bootstrap mechanisms as defined
|
|
// within the current configuration.
|
|
func initNetworkBootstrappers(s *server) ([]discovery.NetworkPeerBootstrapper, error) {
|
|
srvrLog.Infof("Initializing peer network bootstrappers!")
|
|
|
|
var bootStrappers []discovery.NetworkPeerBootstrapper
|
|
|
|
// First, we'll create an instance of the ChannelGraphBootstrapper as
|
|
// this can be used by default if we've already partially seeded the
|
|
// network.
|
|
chanGraph := autopilot.ChannelGraphFromDatabase(s.chanDB.ChannelGraph())
|
|
graphBootstrapper, err := discovery.NewGraphBootstrapper(chanGraph)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
bootStrappers = append(bootStrappers, graphBootstrapper)
|
|
|
|
// If this isn't simnet mode, then one of our additional bootstrapping
|
|
// sources will be the set of running DNS seeds.
|
|
if !cfg.Bitcoin.SimNet || !cfg.Litecoin.SimNet {
|
|
dnsSeeds, ok := chainDNSSeeds[*activeNetParams.GenesisHash]
|
|
|
|
// If we have a set of DNS seeds for this chain, then we'll add
|
|
// it as an additional bootstrapping source.
|
|
if ok {
|
|
srvrLog.Infof("Creating DNS peer bootstrapper with "+
|
|
"seeds: %v", dnsSeeds)
|
|
|
|
dnsBootStrapper := discovery.NewDNSSeedBootstrapper(
|
|
dnsSeeds, cfg.net,
|
|
)
|
|
bootStrappers = append(bootStrappers, dnsBootStrapper)
|
|
}
|
|
}
|
|
|
|
return bootStrappers, nil
|
|
}
|
|
|
|
// peerBootstrapper is a goroutine which is tasked with attempting to establish
|
|
// and maintain a target minimum number of outbound connections. With this
|
|
// invariant, we ensure that our node is connected to a diverse set of peers
|
|
// and that nodes newly joining the network receive an up to date network view
|
|
// as soon as possible.
|
|
func (s *server) peerBootstrapper(numTargetPeers uint32,
|
|
bootstrappers []discovery.NetworkPeerBootstrapper) {
|
|
|
|
defer s.wg.Done()
|
|
|
|
// ignore is a set used to keep track of peers already retrieved from
|
|
// our bootstrappers in order to avoid duplicates.
|
|
ignore := make(map[autopilot.NodeID]struct{})
|
|
|
|
// We'll start off by aggressively attempting connections to peers in
|
|
// order to be a part of the network as soon as possible.
|
|
s.initialPeerBootstrap(ignore, numTargetPeers, bootstrappers)
|
|
|
|
// Once done, we'll attempt to maintain our target minimum number of
|
|
// peers.
|
|
//
|
|
// We'll use a 15 second backoff, and double the time every time an
|
|
// epoch fails up to a ceiling.
|
|
const backOffCeiling = time.Minute * 5
|
|
backOff := time.Second * 15
|
|
|
|
// We'll create a new ticker to wake us up every 15 seconds so we can
|
|
// see if we've reached our minimum number of peers.
|
|
sampleTicker := time.NewTicker(backOff)
|
|
defer sampleTicker.Stop()
|
|
|
|
// We'll use the number of attempts and errors to determine if we need
|
|
// to increase the time between discovery epochs.
|
|
var epochErrors uint32 // To be used atomically.
|
|
var epochAttempts uint32
|
|
|
|
for {
|
|
select {
|
|
// The ticker has just woken us up, so we'll need to check if
|
|
// we need to attempt to connect our to any more peers.
|
|
case <-sampleTicker.C:
|
|
// Obtain the current number of peers, so we can gauge
|
|
// if we need to sample more peers or not.
|
|
s.mu.RLock()
|
|
numActivePeers := uint32(len(s.peersByPub))
|
|
s.mu.RUnlock()
|
|
|
|
// If we have enough peers, then we can loop back
|
|
// around to the next round as we're done here.
|
|
if numActivePeers >= numTargetPeers {
|
|
continue
|
|
}
|
|
|
|
// If all of our attempts failed during this last back
|
|
// off period, then will increase our backoff to 5
|
|
// minute ceiling to avoid an excessive number of
|
|
// queries
|
|
//
|
|
// TODO(roasbeef): add reverse policy too?
|
|
|
|
if epochAttempts > 0 &&
|
|
atomic.LoadUint32(&epochErrors) >= epochAttempts {
|
|
|
|
sampleTicker.Stop()
|
|
|
|
backOff *= 2
|
|
if backOff > backOffCeiling {
|
|
backOff = backOffCeiling
|
|
}
|
|
|
|
srvrLog.Debugf("Backing off peer bootstrapper to "+
|
|
"%v", backOff)
|
|
sampleTicker = time.NewTicker(backOff)
|
|
continue
|
|
}
|
|
|
|
atomic.StoreUint32(&epochErrors, 0)
|
|
epochAttempts = 0
|
|
|
|
// Since we know need more peers, we'll compute the
|
|
// exact number we need to reach our threshold.
|
|
numNeeded := numTargetPeers - numActivePeers
|
|
|
|
srvrLog.Debugf("Attempting to obtain %v more network "+
|
|
"peers", numNeeded)
|
|
|
|
// With the number of peers we need calculated, we'll
|
|
// query the network bootstrappers to sample a set of
|
|
// random addrs for us.
|
|
s.mu.RLock()
|
|
ignoreList := make(map[autopilot.NodeID]struct{})
|
|
for _, peer := range s.peersByPub {
|
|
nID := autopilot.NewNodeID(peer.addr.IdentityKey)
|
|
ignoreList[nID] = struct{}{}
|
|
}
|
|
s.mu.RUnlock()
|
|
|
|
peerAddrs, err := discovery.MultiSourceBootstrap(
|
|
ignoreList, numNeeded*2, bootstrappers...,
|
|
)
|
|
if err != nil {
|
|
srvrLog.Errorf("Unable to retrieve bootstrap "+
|
|
"peers: %v", err)
|
|
continue
|
|
}
|
|
|
|
// Finally, we'll launch a new goroutine for each
|
|
// prospective peer candidates.
|
|
for _, addr := range peerAddrs {
|
|
epochAttempts++
|
|
|
|
go func(a *lnwire.NetAddress) {
|
|
// TODO(roasbeef): can do AS, subnet,
|
|
// country diversity, etc
|
|
errChan := make(chan error, 1)
|
|
s.connectToPeer(a, errChan)
|
|
select {
|
|
case err := <-errChan:
|
|
if err == nil {
|
|
return
|
|
}
|
|
|
|
srvrLog.Errorf("Unable to "+
|
|
"connect to %v: %v",
|
|
a, err)
|
|
atomic.AddUint32(&epochErrors, 1)
|
|
case <-s.quit:
|
|
}
|
|
}(addr)
|
|
}
|
|
case <-s.quit:
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// initialPeerBootstrap attempts to continuously connect to peers on startup
|
|
// until the target number of peers has been reached. This ensures that nodes
|
|
// receive an up to date network view as soon as possible.
|
|
func (s *server) initialPeerBootstrap(ignore map[autopilot.NodeID]struct{},
|
|
numTargetPeers uint32, bootstrappers []discovery.NetworkPeerBootstrapper) {
|
|
|
|
var wg sync.WaitGroup
|
|
|
|
for {
|
|
// Check if the server has been requested to shut down in order
|
|
// to prevent blocking.
|
|
if s.Stopped() {
|
|
return
|
|
}
|
|
|
|
// We can exit our aggressive initial peer bootstrapping stage
|
|
// if we've reached out target number of peers.
|
|
s.mu.RLock()
|
|
numActivePeers := uint32(len(s.peersByPub))
|
|
s.mu.RUnlock()
|
|
|
|
if numActivePeers >= numTargetPeers {
|
|
return
|
|
}
|
|
|
|
// Otherwise, we'll request for the remaining number of peers in
|
|
// order to reach our target.
|
|
peersNeeded := numTargetPeers - numActivePeers
|
|
bootstrapAddrs, err := discovery.MultiSourceBootstrap(
|
|
ignore, peersNeeded, bootstrappers...,
|
|
)
|
|
if err != nil {
|
|
srvrLog.Errorf("Unable to retrieve initial bootstrap "+
|
|
"peers: %v", err)
|
|
continue
|
|
}
|
|
|
|
// Then, we'll attempt to establish a connection to the
|
|
// different peer addresses retrieved by our bootstrappers.
|
|
for _, bootstrapAddr := range bootstrapAddrs {
|
|
wg.Add(1)
|
|
go func(addr *lnwire.NetAddress) {
|
|
defer wg.Done()
|
|
|
|
errChan := make(chan error, 1)
|
|
go s.connectToPeer(addr, errChan)
|
|
|
|
// We'll only allow this connection attempt to
|
|
// take up to 3 seconds. This allows us to move
|
|
// quickly by discarding peers that are slowing
|
|
// us down.
|
|
select {
|
|
case err := <-errChan:
|
|
if err == nil {
|
|
return
|
|
}
|
|
srvrLog.Errorf("Unable to connect to "+
|
|
"%v: %v", addr, err)
|
|
// TODO: tune timeout? 3 seconds might be *too*
|
|
// aggressive but works well.
|
|
case <-time.After(3 * time.Second):
|
|
srvrLog.Tracef("Skipping peer %v due "+
|
|
"to not establishing a "+
|
|
"connection within 3 seconds",
|
|
addr)
|
|
case <-s.quit:
|
|
}
|
|
}(bootstrapAddr)
|
|
}
|
|
|
|
wg.Wait()
|
|
}
|
|
}
|
|
|
|
// initTorController initiliazes the Tor controller backed by lnd and
|
|
// automatically sets up a v2 onion service in order to listen for inbound
|
|
// connections over Tor.
|
|
func (s *server) initTorController() error {
|
|
if err := s.torController.Start(); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Determine the different ports the server is listening on. The onion
|
|
// service's virtual port will map to these ports and one will be picked
|
|
// at random when the onion service is being accessed.
|
|
listenPorts := make(map[int]struct{})
|
|
for _, listenAddr := range s.listenAddrs {
|
|
// At this point, the listen addresses should have already been
|
|
// normalized, so it's safe to ignore the errors.
|
|
_, portStr, _ := net.SplitHostPort(listenAddr.String())
|
|
port, _ := strconv.Atoi(portStr)
|
|
listenPorts[port] = struct{}{}
|
|
}
|
|
|
|
// Once the port mapping has been set, we can go ahead and automatically
|
|
// create our onion service. The service's private key will be saved to
|
|
// disk in order to regain access to this service when restarting `lnd`.
|
|
virtToTargPorts := tor.VirtToTargPorts{defaultPeerPort: listenPorts}
|
|
onionServiceAddrs, err := s.torController.AddOnionV2(
|
|
cfg.Tor.V2PrivateKeyPath, virtToTargPorts,
|
|
)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Now that the onion service has been created, we'll add the different
|
|
// onion addresses it can be reached at to our list of advertised
|
|
// addresses.
|
|
for _, addr := range onionServiceAddrs {
|
|
s.currentNodeAnn.Addresses = append(
|
|
s.currentNodeAnn.Addresses, addr,
|
|
)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// genNodeAnnouncement generates and returns the current fully signed node
|
|
// announcement. If refresh is true, then the time stamp of the announcement
|
|
// will be updated in order to ensure it propagates through the network.
|
|
func (s *server) genNodeAnnouncement(refresh bool,
|
|
updates ...func(*lnwire.NodeAnnouncement)) (lnwire.NodeAnnouncement, error) {
|
|
|
|
s.mu.Lock()
|
|
defer s.mu.Unlock()
|
|
|
|
if !refresh {
|
|
return *s.currentNodeAnn, nil
|
|
}
|
|
|
|
for _, update := range updates {
|
|
update(s.currentNodeAnn)
|
|
}
|
|
|
|
newStamp := uint32(time.Now().Unix())
|
|
if newStamp <= s.currentNodeAnn.Timestamp {
|
|
newStamp = s.currentNodeAnn.Timestamp + 1
|
|
}
|
|
|
|
s.currentNodeAnn.Timestamp = newStamp
|
|
sig, err := discovery.SignAnnouncement(
|
|
s.nodeSigner, s.identityPriv.PubKey(), s.currentNodeAnn,
|
|
)
|
|
if err != nil {
|
|
return lnwire.NodeAnnouncement{}, err
|
|
}
|
|
|
|
s.currentNodeAnn.Signature, err = lnwire.NewSigFromSignature(sig)
|
|
if err != nil {
|
|
return lnwire.NodeAnnouncement{}, err
|
|
}
|
|
|
|
return *s.currentNodeAnn, nil
|
|
}
|
|
|
|
type nodeAddresses struct {
|
|
pubKey *btcec.PublicKey
|
|
addresses []net.Addr
|
|
}
|
|
|
|
// establishPersistentConnections attempts to establish persistent connections
|
|
// to all our direct channel collaborators. In order to promote liveness of
|
|
// our active channels, we instruct the connection manager to attempt to
|
|
// establish and maintain persistent connections to all our direct channel
|
|
// counterparties.
|
|
func (s *server) establishPersistentConnections() error {
|
|
// nodeAddrsMap stores the combination of node public keys and
|
|
// addresses that we'll attempt to reconnect to. PubKey strings are
|
|
// used as keys since other PubKey forms can't be compared.
|
|
nodeAddrsMap := map[string]*nodeAddresses{}
|
|
|
|
// Iterate through the list of LinkNodes to find addresses we should
|
|
// attempt to connect to based on our set of previous connections. Set
|
|
// the reconnection port to the default peer port.
|
|
linkNodes, err := s.chanDB.FetchAllLinkNodes()
|
|
if err != nil && err != channeldb.ErrLinkNodesNotFound {
|
|
return err
|
|
}
|
|
for _, node := range linkNodes {
|
|
pubStr := string(node.IdentityPub.SerializeCompressed())
|
|
nodeAddrs := &nodeAddresses{
|
|
pubKey: node.IdentityPub,
|
|
addresses: node.Addresses,
|
|
}
|
|
nodeAddrsMap[pubStr] = nodeAddrs
|
|
}
|
|
|
|
// After checking our previous connections for addresses to connect to,
|
|
// iterate through the nodes in our channel graph to find addresses
|
|
// that have been added via NodeAnnouncement messages.
|
|
chanGraph := s.chanDB.ChannelGraph()
|
|
sourceNode, err := chanGraph.SourceNode()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// TODO(roasbeef): instead iterate over link nodes and query graph for
|
|
// each of the nodes.
|
|
err = sourceNode.ForEachChannel(nil, func(
|
|
_ *bolt.Tx,
|
|
_ *channeldb.ChannelEdgeInfo,
|
|
policy, _ *channeldb.ChannelEdgePolicy) error {
|
|
|
|
pubStr := string(policy.Node.PubKeyBytes[:])
|
|
|
|
// Add addresses from channel graph/NodeAnnouncements to the
|
|
// list of addresses we'll connect to. If there are duplicates
|
|
// that have different ports specified, the port from the
|
|
// channel graph should supersede the port from the link node.
|
|
var addrs []net.Addr
|
|
linkNodeAddrs, ok := nodeAddrsMap[pubStr]
|
|
if ok {
|
|
for _, lnAddress := range linkNodeAddrs.addresses {
|
|
var addrHost string
|
|
switch addr := lnAddress.(type) {
|
|
case *net.TCPAddr:
|
|
addrHost = addr.IP.String()
|
|
case *tor.OnionAddr:
|
|
addrHost = addr.OnionService
|
|
default:
|
|
continue
|
|
}
|
|
|
|
var addrMatched bool
|
|
for _, polAddress := range policy.Node.Addresses {
|
|
switch addr := polAddress.(type) {
|
|
case *net.TCPAddr:
|
|
if addr.IP.String() == addrHost {
|
|
addrMatched = true
|
|
addrs = append(addrs, addr)
|
|
}
|
|
case *tor.OnionAddr:
|
|
if addr.OnionService == addrHost {
|
|
addrMatched = true
|
|
addrs = append(addrs, addr)
|
|
}
|
|
}
|
|
}
|
|
if !addrMatched {
|
|
addrs = append(addrs, lnAddress)
|
|
}
|
|
}
|
|
} else {
|
|
for _, addr := range policy.Node.Addresses {
|
|
switch addr.(type) {
|
|
case *net.TCPAddr, *tor.OnionAddr:
|
|
addrs = append(addrs, addr)
|
|
}
|
|
}
|
|
}
|
|
|
|
n := &nodeAddresses{
|
|
addresses: addrs,
|
|
}
|
|
n.pubKey, err = policy.Node.PubKey()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
nodeAddrsMap[pubStr] = n
|
|
return nil
|
|
})
|
|
if err != nil && err != channeldb.ErrGraphNoEdgesFound {
|
|
return err
|
|
}
|
|
|
|
// Acquire and hold server lock until all persistent connection requests
|
|
// have been recorded and sent to the connection manager.
|
|
s.mu.Lock()
|
|
defer s.mu.Unlock()
|
|
|
|
// Iterate through the combined list of addresses from prior links and
|
|
// node announcements and attempt to reconnect to each node.
|
|
for pubStr, nodeAddr := range nodeAddrsMap {
|
|
// Add this peer to the set of peers we should maintain a
|
|
// persistent connection with.
|
|
s.persistentPeers[pubStr] = struct{}{}
|
|
if _, ok := s.persistentPeersBackoff[pubStr]; !ok {
|
|
s.persistentPeersBackoff[pubStr] = defaultBackoff
|
|
}
|
|
|
|
for _, address := range nodeAddr.addresses {
|
|
// Create a wrapper address which couples the IP and
|
|
// the pubkey so the brontide authenticated connection
|
|
// can be established.
|
|
lnAddr := &lnwire.NetAddress{
|
|
IdentityKey: nodeAddr.pubKey,
|
|
Address: address,
|
|
}
|
|
srvrLog.Debugf("Attempting persistent connection to "+
|
|
"channel peer %v", lnAddr)
|
|
|
|
// Send the persistent connection request to the
|
|
// connection manager, saving the request itself so we
|
|
// can cancel/restart the process as needed.
|
|
connReq := &connmgr.ConnReq{
|
|
Addr: lnAddr,
|
|
Permanent: true,
|
|
}
|
|
|
|
s.persistentConnReqs[pubStr] = append(
|
|
s.persistentConnReqs[pubStr], connReq)
|
|
|
|
go s.connMgr.Connect(connReq)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// prunePersistentPeerConnection removes all internal state related to
|
|
// persistent connections to a peer within the server. This is used to avoid
|
|
// persistent connection retries to peers we do not have any open channels with.
|
|
func (s *server) prunePersistentPeerConnection(compressedPubKey [33]byte) {
|
|
srvrLog.Infof("Pruning peer %x from persistent connections, number of "+
|
|
"open channels is now zero", compressedPubKey)
|
|
|
|
pubKeyStr := string(compressedPubKey[:])
|
|
|
|
s.mu.Lock()
|
|
delete(s.persistentPeers, pubKeyStr)
|
|
delete(s.persistentPeersBackoff, pubKeyStr)
|
|
s.cancelConnReqs(pubKeyStr, nil)
|
|
s.mu.Unlock()
|
|
}
|
|
|
|
// BroadcastMessage sends a request to the server to broadcast a set of
|
|
// messages to all peers other than the one specified by the `skips` parameter.
|
|
//
|
|
// NOTE: This function is safe for concurrent access.
|
|
func (s *server) BroadcastMessage(skips map[routing.Vertex]struct{},
|
|
msgs ...lnwire.Message) error {
|
|
|
|
srvrLog.Debugf("Broadcasting %v messages", len(msgs))
|
|
|
|
// Filter out peers found in the skips map. We synchronize access to
|
|
// peersByPub throughout this process to ensure we deliver messages to
|
|
// exact set of peers present at the time of invocation.
|
|
s.mu.RLock()
|
|
peers := make([]*peer, 0, len(s.peersByPub))
|
|
for _, sPeer := range s.peersByPub {
|
|
if skips != nil {
|
|
if _, ok := skips[sPeer.pubKeyBytes]; ok {
|
|
srvrLog.Tracef("Skipping %x in broadcast",
|
|
sPeer.pubKeyBytes[:])
|
|
continue
|
|
}
|
|
}
|
|
|
|
peers = append(peers, sPeer)
|
|
}
|
|
s.mu.RUnlock()
|
|
|
|
// Iterate over all known peers, dispatching a go routine to enqueue
|
|
// all messages to each of peers.
|
|
var wg sync.WaitGroup
|
|
for _, sPeer := range peers {
|
|
// Dispatch a go routine to enqueue all messages to this peer.
|
|
wg.Add(1)
|
|
s.wg.Add(1)
|
|
go s.sendPeerMessages(sPeer, msgs, &wg)
|
|
}
|
|
|
|
// Wait for all messages to have been dispatched before returning to
|
|
// caller.
|
|
wg.Wait()
|
|
|
|
return nil
|
|
}
|
|
|
|
// SendToPeer send a message to the server telling it to send the specific set
|
|
// of message to a particular peer. If the peer connect be found, then this
|
|
// method will return a non-nil error.
|
|
//
|
|
// NOTE: This function is safe for concurrent access.
|
|
func (s *server) SendToPeer(target *btcec.PublicKey,
|
|
msgs ...lnwire.Message) error {
|
|
|
|
// Compute the target peer's identifier.
|
|
targetPubBytes := target.SerializeCompressed()
|
|
|
|
srvrLog.Tracef("Attempting to send msgs %v to: %x",
|
|
len(msgs), targetPubBytes)
|
|
|
|
// Lookup intended target in peersByPub, returning an error to the
|
|
// caller if the peer is unknown. Access to peersByPub is synchronized
|
|
// here to ensure we consider the exact set of peers present at the
|
|
// time of invocation.
|
|
s.mu.RLock()
|
|
targetPeer, err := s.findPeerByPubStr(string(targetPubBytes))
|
|
s.mu.RUnlock()
|
|
if err == ErrPeerNotConnected {
|
|
srvrLog.Errorf("unable to send message to %x, "+
|
|
"peer is not connected", targetPubBytes)
|
|
return err
|
|
}
|
|
|
|
// Send messages to the peer and get the error channels that will be
|
|
// signaled by the peer's write handler.
|
|
errChans := s.sendPeerMessages(targetPeer, msgs, nil)
|
|
|
|
// With the server's shared lock released, we now handle all of the
|
|
// errors being returned from the target peer's write handler.
|
|
for _, errChan := range errChans {
|
|
select {
|
|
case err := <-errChan:
|
|
return err
|
|
case <-targetPeer.quit:
|
|
return ErrPeerExiting
|
|
case <-s.quit:
|
|
return ErrServerShuttingDown
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// NotifyWhenOnline can be called by other subsystems to get notified when a
|
|
// particular peer comes online. The peer itself is sent across the peerChan.
|
|
//
|
|
// NOTE: This function is safe for concurrent access.
|
|
func (s *server) NotifyWhenOnline(peerKey *btcec.PublicKey,
|
|
peerChan chan<- lnpeer.Peer) {
|
|
|
|
s.mu.Lock()
|
|
defer s.mu.Unlock()
|
|
|
|
// Compute the target peer's identifier.
|
|
pubStr := string(peerKey.SerializeCompressed())
|
|
|
|
// Check if peer is connected.
|
|
peer, ok := s.peersByPub[pubStr]
|
|
if ok {
|
|
// Connected, can return early.
|
|
srvrLog.Debugf("Notifying that peer %x is online",
|
|
peerKey.SerializeCompressed())
|
|
|
|
select {
|
|
case peerChan <- peer:
|
|
case <-s.quit:
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
// Not connected, store this listener such that it can be notified when
|
|
// the peer comes online.
|
|
s.peerConnectedListeners[pubStr] = append(
|
|
s.peerConnectedListeners[pubStr], peerChan,
|
|
)
|
|
}
|
|
|
|
// sendPeerMessages enqueues a list of messages into the outgoingQueue of the
|
|
// `targetPeer`. This method supports additional broadcast-level
|
|
// synchronization by using the additional `wg` to coordinate a particular
|
|
// broadcast. Since this method will wait for the return error from sending
|
|
// each message, it should be run as a goroutine (see comment below) and
|
|
// the error ignored if used for broadcasting messages, where the result
|
|
// from sending the messages is not of importance.
|
|
//
|
|
// NOTE: This method must be invoked with a non-nil `wg` if it is spawned as a
|
|
// go routine--both `wg` and the server's WaitGroup should be incremented
|
|
// beforehand. If this method is not spawned as a go routine, the provided
|
|
// `wg` should be nil, and the server's WaitGroup should not be tracking this
|
|
// invocation.
|
|
func (s *server) sendPeerMessages(
|
|
targetPeer *peer,
|
|
msgs []lnwire.Message,
|
|
wg *sync.WaitGroup) []chan error {
|
|
|
|
// If a WaitGroup is provided, we assume that this method was spawned
|
|
// as a go routine, and that it is being tracked by both the server's
|
|
// WaitGroup, as well as the broadcast-level WaitGroup `wg`. In this
|
|
// event, we defer a call to Done on both WaitGroups to 1) ensure that
|
|
// server will be able to shutdown after its go routines exit, and 2)
|
|
// so the server can return to the caller of BroadcastMessage.
|
|
isBroadcast := wg != nil
|
|
if isBroadcast {
|
|
defer s.wg.Done()
|
|
defer wg.Done()
|
|
}
|
|
|
|
// We queue each message, creating a slice of error channels that
|
|
// can be inspected after every message is successfully added to
|
|
// the queue.
|
|
var errChans []chan error
|
|
for _, msg := range msgs {
|
|
// If this is not broadcast, create error channels to provide
|
|
// synchronous feedback regarding the delivery of the message to
|
|
// a specific peer.
|
|
var errChan chan error
|
|
if !isBroadcast {
|
|
errChan = make(chan error, 1)
|
|
errChans = append(errChans, errChan)
|
|
}
|
|
|
|
targetPeer.queueMsg(msg, errChan)
|
|
}
|
|
|
|
return errChans
|
|
}
|
|
|
|
// FindPeer will return the peer that corresponds to the passed in public key.
|
|
// This function is used by the funding manager, allowing it to update the
|
|
// daemon's local representation of the remote peer.
|
|
//
|
|
// NOTE: This function is safe for concurrent access.
|
|
func (s *server) FindPeer(peerKey *btcec.PublicKey) (*peer, error) {
|
|
s.mu.RLock()
|
|
defer s.mu.RUnlock()
|
|
|
|
pubStr := string(peerKey.SerializeCompressed())
|
|
|
|
return s.findPeerByPubStr(pubStr)
|
|
}
|
|
|
|
// FindPeerByPubStr will return the peer that corresponds to the passed peerID,
|
|
// which should be a string representation of the peer's serialized, compressed
|
|
// public key.
|
|
//
|
|
// NOTE: This function is safe for concurrent access.
|
|
func (s *server) FindPeerByPubStr(pubStr string) (*peer, error) {
|
|
s.mu.RLock()
|
|
defer s.mu.RUnlock()
|
|
|
|
return s.findPeerByPubStr(pubStr)
|
|
}
|
|
|
|
// findPeerByPubStr is an internal method that retrieves the specified peer from
|
|
// the server's internal state using.
|
|
func (s *server) findPeerByPubStr(pubStr string) (*peer, error) {
|
|
peer, ok := s.peersByPub[pubStr]
|
|
if !ok {
|
|
return nil, ErrPeerNotConnected
|
|
}
|
|
|
|
return peer, nil
|
|
}
|
|
|
|
// nextPeerBackoff computes the next backoff duration for a peer's pubkey using
|
|
// exponential backoff. If no previous backoff was known, the default is
|
|
// returned.
|
|
func (s *server) nextPeerBackoff(pubStr string,
|
|
startTime time.Time) time.Duration {
|
|
|
|
// Now, determine the appropriate backoff to use for the retry.
|
|
backoff, ok := s.persistentPeersBackoff[pubStr]
|
|
if !ok {
|
|
// If an existing backoff was unknown, use the default.
|
|
return defaultBackoff
|
|
}
|
|
|
|
// If the peer failed to start properly, we'll just use the previous
|
|
// backoff to compute the subsequent randomized exponential backoff
|
|
// duration. This will roughly double on average.
|
|
if startTime.IsZero() {
|
|
return computeNextBackoff(backoff)
|
|
}
|
|
|
|
// The peer succeeded in starting. We'll reduce the timeout duration
|
|
// by the length of the connection before applying randomized
|
|
// exponential backoff. We'll only apply this if:
|
|
// backoff - connDuration > defaultBackoff
|
|
connDuration := time.Now().Sub(startTime)
|
|
relaxedBackoff := backoff - connDuration
|
|
if relaxedBackoff > defaultBackoff {
|
|
return computeNextBackoff(relaxedBackoff)
|
|
}
|
|
|
|
// Otherwise, backoff - connDuration <= defaultBackoff, meaning the
|
|
// connection lasted much longer than our previous backoff. To reward
|
|
// such good behavior, we'll reconnect after the default timeout.
|
|
return defaultBackoff
|
|
}
|
|
|
|
// shouldRequestGraphSync returns true if the servers deems it necessary that
|
|
// we sync channel graph state with the remote peer. This method is used to
|
|
// avoid _always_ syncing channel graph state with each peer that connects.
|
|
//
|
|
// NOTE: This MUST be called with the server's mutex held.
|
|
func (s *server) shouldRequestGraphSync() bool {
|
|
// Initially, we'll only request a graph sync iff we have less than two
|
|
// peers.
|
|
return len(s.peersByPub) <= 2
|
|
}
|
|
|
|
// shouldDropConnection determines if our local connection to a remote peer
|
|
// should be dropped in the case of concurrent connection establishment. In
|
|
// order to deterministically decide which connection should be dropped, we'll
|
|
// utilize the ordering of the local and remote public key. If we didn't use
|
|
// such a tie breaker, then we risk _both_ connections erroneously being
|
|
// dropped.
|
|
func shouldDropLocalConnection(local, remote *btcec.PublicKey) bool {
|
|
localPubBytes := local.SerializeCompressed()
|
|
remotePubPbytes := remote.SerializeCompressed()
|
|
|
|
// The connection that comes from the node with a "smaller" pubkey
|
|
// should be kept. Therefore, if our pubkey is "greater" than theirs, we
|
|
// should drop our established connection.
|
|
return bytes.Compare(localPubBytes, remotePubPbytes) > 0
|
|
}
|
|
|
|
// InboundPeerConnected initializes a new peer in response to a new inbound
|
|
// connection.
|
|
//
|
|
// NOTE: This function is safe for concurrent access.
|
|
func (s *server) InboundPeerConnected(conn net.Conn) {
|
|
// Exit early if we have already been instructed to shutdown, this
|
|
// prevents any delayed callbacks from accidentally registering peers.
|
|
if s.Stopped() {
|
|
return
|
|
}
|
|
|
|
nodePub := conn.(*brontide.Conn).RemotePub()
|
|
pubStr := string(nodePub.SerializeCompressed())
|
|
|
|
s.mu.Lock()
|
|
defer s.mu.Unlock()
|
|
|
|
// If we already have an outbound connection to this peer, then ignore
|
|
// this new connection.
|
|
if _, ok := s.outboundPeers[pubStr]; ok {
|
|
srvrLog.Debugf("Already have outbound connection for %x, "+
|
|
"ignoring inbound connection",
|
|
nodePub.SerializeCompressed())
|
|
|
|
conn.Close()
|
|
return
|
|
}
|
|
|
|
// If we already have a valid connection that is scheduled to take
|
|
// precedence once the prior peer has finished disconnecting, we'll
|
|
// ignore this connection.
|
|
if _, ok := s.scheduledPeerConnection[pubStr]; ok {
|
|
srvrLog.Debugf("Ignoring connection, peer already scheduled")
|
|
conn.Close()
|
|
return
|
|
}
|
|
|
|
srvrLog.Infof("New inbound connection from %v", conn.RemoteAddr())
|
|
|
|
// Check to see if we already have a connection with this peer. If so,
|
|
// we may need to drop our existing connection. This prevents us from
|
|
// having duplicate connections to the same peer. We forgo adding a
|
|
// default case as we expect these to be the only error values returned
|
|
// from findPeerByPubStr.
|
|
connectedPeer, err := s.findPeerByPubStr(pubStr)
|
|
switch err {
|
|
case ErrPeerNotConnected:
|
|
// We were unable to locate an existing connection with the
|
|
// target peer, proceed to connect.
|
|
s.cancelConnReqs(pubStr, nil)
|
|
s.peerConnected(conn, nil, true)
|
|
|
|
case nil:
|
|
// We already have a connection with the incoming peer. If the
|
|
// connection we've already established should be kept, then
|
|
// we'll close out this connection s.t there's only a single
|
|
// connection between us.
|
|
localPub := s.identityPriv.PubKey()
|
|
if !shouldDropLocalConnection(localPub, nodePub) {
|
|
srvrLog.Warnf("Received inbound connection from "+
|
|
"peer %x, but already connected, dropping conn",
|
|
nodePub.SerializeCompressed())
|
|
conn.Close()
|
|
return
|
|
}
|
|
|
|
// Otherwise, if we should drop the connection, then we'll
|
|
// disconnect our already connected peer.
|
|
srvrLog.Debugf("Disconnecting stale connection to %v",
|
|
connectedPeer)
|
|
|
|
s.cancelConnReqs(pubStr, nil)
|
|
|
|
// Remove the current peer from the server's internal state and
|
|
// signal that the peer termination watcher does not need to
|
|
// execute for this peer.
|
|
s.removePeer(connectedPeer)
|
|
s.ignorePeerTermination[connectedPeer] = struct{}{}
|
|
s.scheduledPeerConnection[pubStr] = func() {
|
|
s.peerConnected(conn, nil, true)
|
|
}
|
|
}
|
|
}
|
|
|
|
// OutboundPeerConnected initializes a new peer in response to a new outbound
|
|
// connection.
|
|
// NOTE: This function is safe for concurrent access.
|
|
func (s *server) OutboundPeerConnected(connReq *connmgr.ConnReq, conn net.Conn) {
|
|
// Exit early if we have already been instructed to shutdown, this
|
|
// prevents any delayed callbacks from accidentally registering peers.
|
|
if s.Stopped() {
|
|
return
|
|
}
|
|
|
|
nodePub := conn.(*brontide.Conn).RemotePub()
|
|
pubStr := string(nodePub.SerializeCompressed())
|
|
|
|
s.mu.Lock()
|
|
defer s.mu.Unlock()
|
|
|
|
// If we already have an inbound connection to this peer, then ignore
|
|
// this new connection.
|
|
if _, ok := s.inboundPeers[pubStr]; ok {
|
|
srvrLog.Debugf("Already have inbound connection for %x, "+
|
|
"ignoring outbound connection",
|
|
nodePub.SerializeCompressed())
|
|
|
|
if connReq != nil {
|
|
s.connMgr.Remove(connReq.ID())
|
|
}
|
|
conn.Close()
|
|
return
|
|
}
|
|
if _, ok := s.persistentConnReqs[pubStr]; !ok && connReq != nil {
|
|
srvrLog.Debugf("Ignoring cancelled outbound connection")
|
|
s.connMgr.Remove(connReq.ID())
|
|
conn.Close()
|
|
return
|
|
}
|
|
|
|
// If we already have a valid connection that is scheduled to take
|
|
// precedence once the prior peer has finished disconnecting, we'll
|
|
// ignore this connection.
|
|
if _, ok := s.scheduledPeerConnection[pubStr]; ok {
|
|
srvrLog.Debugf("Ignoring connection, peer already scheduled")
|
|
|
|
if connReq != nil {
|
|
s.connMgr.Remove(connReq.ID())
|
|
}
|
|
|
|
conn.Close()
|
|
return
|
|
}
|
|
|
|
srvrLog.Infof("Established connection to: %v", conn.RemoteAddr())
|
|
|
|
if connReq != nil {
|
|
// A successful connection was returned by the connmgr.
|
|
// Immediately cancel all pending requests, excluding the
|
|
// outbound connection we just established.
|
|
ignore := connReq.ID()
|
|
s.cancelConnReqs(pubStr, &ignore)
|
|
} else {
|
|
// This was a successful connection made by some other
|
|
// subsystem. Remove all requests being managed by the connmgr.
|
|
s.cancelConnReqs(pubStr, nil)
|
|
}
|
|
|
|
// If we already have a connection with this peer, decide whether or not
|
|
// we need to drop the stale connection. We forgo adding a default case
|
|
// as we expect these to be the only error values returned from
|
|
// findPeerByPubStr.
|
|
connectedPeer, err := s.findPeerByPubStr(pubStr)
|
|
switch err {
|
|
case ErrPeerNotConnected:
|
|
// We were unable to locate an existing connection with the
|
|
// target peer, proceed to connect.
|
|
s.peerConnected(conn, connReq, false)
|
|
|
|
case nil:
|
|
// We already have a connection open with the target peer.
|
|
// If our (this) connection should be dropped, then we'll do
|
|
// so, in order to ensure we don't have any duplicate
|
|
// connections.
|
|
localPub := s.identityPriv.PubKey()
|
|
if shouldDropLocalConnection(localPub, nodePub) {
|
|
srvrLog.Warnf("Established outbound connection to "+
|
|
"peer %x, but already connected, dropping conn",
|
|
nodePub.SerializeCompressed())
|
|
if connReq != nil {
|
|
s.connMgr.Remove(connReq.ID())
|
|
}
|
|
conn.Close()
|
|
return
|
|
}
|
|
|
|
// Otherwise, _their_ connection should be dropped. So we'll
|
|
// disconnect the peer and send the now obsolete peer to the
|
|
// server for garbage collection.
|
|
srvrLog.Debugf("Disconnecting stale connection to %v",
|
|
connectedPeer)
|
|
|
|
// Remove the current peer from the server's internal state and
|
|
// signal that the peer termination watcher does not need to
|
|
// execute for this peer.
|
|
s.removePeer(connectedPeer)
|
|
s.ignorePeerTermination[connectedPeer] = struct{}{}
|
|
s.scheduledPeerConnection[pubStr] = func() {
|
|
s.peerConnected(conn, connReq, false)
|
|
}
|
|
}
|
|
}
|
|
|
|
// UnassignedConnID is the default connection ID that a request can have before
|
|
// it actually is submitted to the connmgr.
|
|
// TODO(conner): move into connmgr package, or better, add connmgr method for
|
|
// generating atomic IDs
|
|
const UnassignedConnID uint64 = 0
|
|
|
|
// cancelConnReqs stops all persistent connection requests for a given pubkey.
|
|
// Any attempts initiated by the peerTerminationWatcher are canceled first.
|
|
// Afterwards, each connection request removed from the connmgr. The caller can
|
|
// optionally specify a connection ID to ignore, which prevents us from
|
|
// canceling a successful request. All persistent connreqs for the provided
|
|
// pubkey are discarded after the operationjw.
|
|
func (s *server) cancelConnReqs(pubStr string, skip *uint64) {
|
|
// First, cancel any lingering persistent retry attempts, which will
|
|
// prevent retries for any with backoffs that are still maturing.
|
|
if cancelChan, ok := s.persistentRetryCancels[pubStr]; ok {
|
|
close(cancelChan)
|
|
delete(s.persistentRetryCancels, pubStr)
|
|
}
|
|
|
|
// Next, check to see if we have any outstanding persistent connection
|
|
// requests to this peer. If so, then we'll remove all of these
|
|
// connection requests, and also delete the entry from the map.
|
|
connReqs, ok := s.persistentConnReqs[pubStr]
|
|
if !ok {
|
|
return
|
|
}
|
|
|
|
for _, connReq := range connReqs {
|
|
// Atomically capture the current request identifier.
|
|
connID := connReq.ID()
|
|
|
|
// Skip any zero IDs, this indicates the request has not
|
|
// yet been schedule.
|
|
if connID == UnassignedConnID {
|
|
continue
|
|
}
|
|
|
|
// Skip a particular connection ID if instructed.
|
|
if skip != nil && connID == *skip {
|
|
continue
|
|
}
|
|
|
|
s.connMgr.Remove(connID)
|
|
}
|
|
|
|
delete(s.persistentConnReqs, pubStr)
|
|
}
|
|
|
|
// peerConnected is a function that handles initialization a newly connected
|
|
// peer by adding it to the server's global list of all active peers, and
|
|
// starting all the goroutines the peer needs to function properly. The inbound
|
|
// boolean should be true if the peer initiated the connection to us.
|
|
func (s *server) peerConnected(conn net.Conn, connReq *connmgr.ConnReq,
|
|
inbound bool) {
|
|
|
|
brontideConn := conn.(*brontide.Conn)
|
|
addr := conn.RemoteAddr()
|
|
pubKey := brontideConn.RemotePub()
|
|
|
|
srvrLog.Infof("Finalizing connection to %x, inbound=%v",
|
|
pubKey.SerializeCompressed(), inbound)
|
|
|
|
peerAddr := &lnwire.NetAddress{
|
|
IdentityKey: pubKey,
|
|
Address: addr,
|
|
ChainNet: activeNetParams.Net,
|
|
}
|
|
|
|
// With the brontide connection established, we'll now craft the local
|
|
// feature vector to advertise to the remote node.
|
|
localFeatures := lnwire.NewRawFeatureVector()
|
|
|
|
// We'll signal that we understand the data loss protection feature,
|
|
// and also that we support the new gossip query features.
|
|
localFeatures.Set(lnwire.DataLossProtectOptional)
|
|
localFeatures.Set(lnwire.GossipQueriesOptional)
|
|
|
|
// We'll only request a full channel graph sync if we detect that that
|
|
// we aren't fully synced yet.
|
|
if s.shouldRequestGraphSync() {
|
|
// TODO(roasbeef): only do so if gossiper doesn't have active
|
|
// peers?
|
|
localFeatures.Set(lnwire.InitialRoutingSync)
|
|
}
|
|
|
|
// Now that we've established a connection, create a peer, and it to
|
|
// the set of currently active peers.
|
|
p, err := newPeer(conn, connReq, s, peerAddr, inbound, localFeatures)
|
|
if err != nil {
|
|
srvrLog.Errorf("unable to create peer %v", err)
|
|
return
|
|
}
|
|
|
|
// TODO(roasbeef): update IP address for link-node
|
|
// * also mark last-seen, do it one single transaction?
|
|
|
|
s.addPeer(p)
|
|
|
|
// Dispatch a goroutine to asynchronously start the peer. This process
|
|
// includes sending and receiving Init messages, which would be a DOS
|
|
// vector if we held the server's mutex throughout the procedure.
|
|
s.wg.Add(1)
|
|
go s.peerInitializer(p)
|
|
}
|
|
|
|
// addPeer adds the passed peer to the server's global state of all active
|
|
// peers.
|
|
func (s *server) addPeer(p *peer) {
|
|
if p == nil {
|
|
return
|
|
}
|
|
|
|
// Ignore new peers if we're shutting down.
|
|
if s.Stopped() {
|
|
p.Disconnect(ErrServerShuttingDown)
|
|
return
|
|
}
|
|
|
|
// Track the new peer in our indexes so we can quickly look it up either
|
|
// according to its public key, or its peer ID.
|
|
// TODO(roasbeef): pipe all requests through to the
|
|
// queryHandler/peerManager
|
|
|
|
pubStr := string(p.addr.IdentityKey.SerializeCompressed())
|
|
|
|
s.peersByPub[pubStr] = p
|
|
|
|
if p.inbound {
|
|
s.inboundPeers[pubStr] = p
|
|
} else {
|
|
s.outboundPeers[pubStr] = p
|
|
}
|
|
}
|
|
|
|
// peerInitializer asynchronously starts a newly connected peer after it has
|
|
// been added to the server's peer map. This method sets up a
|
|
// peerTerminationWatcher for the given peer, and ensures that it executes even
|
|
// if the peer failed to start. In the event of a successful connection, this
|
|
// method reads the negotiated, local feature-bits and spawns the appropriate
|
|
// graph synchronization method. Any registered clients of NotifyWhenOnline will
|
|
// be signaled of the new peer once the method returns.
|
|
//
|
|
// NOTE: This MUST be launched as a goroutine.
|
|
func (s *server) peerInitializer(p *peer) {
|
|
defer s.wg.Done()
|
|
|
|
// Avoid initializing peers while the server is exiting.
|
|
if s.Stopped() {
|
|
return
|
|
}
|
|
|
|
// Create a channel that will be used to signal a successful start of
|
|
// the link. This prevents the peer termination watcher from beginning
|
|
// its duty too early.
|
|
ready := make(chan struct{})
|
|
|
|
// Before starting the peer, launch a goroutine to watch for the
|
|
// unexpected termination of this peer, which will ensure all resources
|
|
// are properly cleaned up, and re-establish persistent connections when
|
|
// necessary. The peer termination watcher will be short circuited if
|
|
// the peer is ever added to the ignorePeerTermination map, indicating
|
|
// that the server has already handled the removal of this peer.
|
|
s.wg.Add(1)
|
|
go s.peerTerminationWatcher(p, ready)
|
|
|
|
// Start teh peer! If an error occurs, we Disconnect the peer, which
|
|
// will unblock the peerTerminationWatcher.
|
|
if err := p.Start(); err != nil {
|
|
p.Disconnect(errors.New("unable to start peer: %v"))
|
|
return
|
|
}
|
|
|
|
// Otherwise, signal to the peerTerminationWatcher that the peer startup
|
|
// was successful, and to begin watching the peer's wait group.
|
|
close(ready)
|
|
|
|
switch {
|
|
// If the remote peer knows of the new gossip queries feature, then
|
|
// we'll create a new gossipSyncer in the AuthenticatedGossiper for it.
|
|
case p.remoteLocalFeatures.HasFeature(lnwire.GossipQueriesOptional):
|
|
srvrLog.Infof("Negotiated chan series queries with %x",
|
|
p.pubKeyBytes[:])
|
|
|
|
// We'll only request channel updates from the remote peer if
|
|
// its enabled in the config, or we're already getting updates
|
|
// from enough peers.
|
|
//
|
|
// TODO(roasbeef): craft s.t. we only get updates from a few
|
|
// peers
|
|
recvUpdates := !cfg.NoChanUpdates
|
|
go s.authGossiper.InitSyncState(p, recvUpdates)
|
|
|
|
// If the remote peer has the initial sync feature bit set, then we'll
|
|
// being the synchronization protocol to exchange authenticated channel
|
|
// graph edges/vertexes, but only if they don't know of the new gossip
|
|
// queries.
|
|
case p.remoteLocalFeatures.HasFeature(lnwire.InitialRoutingSync):
|
|
srvrLog.Infof("Requesting full table sync with %x",
|
|
p.pubKeyBytes[:])
|
|
|
|
go s.authGossiper.SynchronizeNode(p)
|
|
}
|
|
|
|
pubStr := string(p.addr.IdentityKey.SerializeCompressed())
|
|
|
|
s.mu.Lock()
|
|
defer s.mu.Unlock()
|
|
|
|
// Check if there are listeners waiting for this peer to come online.
|
|
for _, peerChan := range s.peerConnectedListeners[pubStr] {
|
|
select {
|
|
case peerChan <- p:
|
|
case <-s.quit:
|
|
return
|
|
}
|
|
}
|
|
delete(s.peerConnectedListeners, pubStr)
|
|
}
|
|
|
|
// peerTerminationWatcher waits until a peer has been disconnected unexpectedly,
|
|
// and then cleans up all resources allocated to the peer, notifies relevant
|
|
// sub-systems of its demise, and finally handles re-connecting to the peer if
|
|
// it's persistent. If the server intentionally disconnects a peer, it should
|
|
// have a corresponding entry in the ignorePeerTermination map which will cause
|
|
// the cleanup routine to exit early. The passed `ready` chan is used to
|
|
// synchronize when WaitForDisconnect should begin watching on the peer's
|
|
// waitgroup. The ready chan should only be signaled if the peer starts
|
|
// successfully, otherwise the peer should be disconnected instead.
|
|
//
|
|
// NOTE: This MUST be launched as a goroutine.
|
|
func (s *server) peerTerminationWatcher(p *peer, ready chan struct{}) {
|
|
defer s.wg.Done()
|
|
|
|
p.WaitForDisconnect(ready)
|
|
|
|
srvrLog.Debugf("Peer %v has been disconnected", p)
|
|
|
|
// If the server is exiting then we can bail out early ourselves as all
|
|
// the other sub-systems will already be shutting down.
|
|
if s.Stopped() {
|
|
return
|
|
}
|
|
|
|
// Next, we'll cancel all pending funding reservations with this node.
|
|
// If we tried to initiate any funding flows that haven't yet finished,
|
|
// then we need to unlock those committed outputs so they're still
|
|
// available for use.
|
|
s.fundingMgr.CancelPeerReservations(p.PubKey())
|
|
|
|
pubKey := p.addr.IdentityKey
|
|
|
|
// We'll also inform the gossiper that this peer is no longer active,
|
|
// so we don't need to maintain sync state for it any longer.
|
|
s.authGossiper.PruneSyncState(pubKey)
|
|
|
|
// Tell the switch to remove all links associated with this peer.
|
|
// Passing nil as the target link indicates that all links associated
|
|
// with this interface should be closed.
|
|
//
|
|
// TODO(roasbeef): instead add a PurgeInterfaceLinks function?
|
|
links, err := p.server.htlcSwitch.GetLinksByInterface(p.pubKeyBytes)
|
|
if err != nil && err != htlcswitch.ErrNoLinksFound {
|
|
srvrLog.Errorf("Unable to get channel links for %x: %v",
|
|
p.pubKeyBytes, err)
|
|
}
|
|
|
|
for _, link := range links {
|
|
p.server.htlcSwitch.RemoveLink(link.ChanID())
|
|
}
|
|
|
|
s.mu.Lock()
|
|
defer s.mu.Unlock()
|
|
|
|
// If the server has already removed this peer, we can short circuit the
|
|
// peer termination watcher and skip cleanup.
|
|
if _, ok := s.ignorePeerTermination[p]; ok {
|
|
delete(s.ignorePeerTermination, p)
|
|
|
|
pubKey := p.PubKey()
|
|
pubStr := string(pubKey[:])
|
|
|
|
// If a connection callback is present, we'll go ahead and
|
|
// execute it now that previous peer has fully disconnected. If
|
|
// the callback is not present, this likely implies the peer was
|
|
// purposefully disconnected via RPC, and that no reconnect
|
|
// should be attempted.
|
|
connCallback, ok := s.scheduledPeerConnection[pubStr]
|
|
if ok {
|
|
delete(s.scheduledPeerConnection, pubStr)
|
|
connCallback()
|
|
}
|
|
return
|
|
}
|
|
|
|
// First, cleanup any remaining state the server has regarding the peer
|
|
// in question.
|
|
s.removePeer(p)
|
|
|
|
// Next, check to see if this is a persistent peer or not.
|
|
pubStr := string(pubKey.SerializeCompressed())
|
|
_, ok := s.persistentPeers[pubStr]
|
|
if ok {
|
|
// We'll only need to re-launch a connection request if one
|
|
// isn't already currently pending.
|
|
if _, ok := s.persistentConnReqs[pubStr]; ok {
|
|
return
|
|
}
|
|
|
|
// We'll ensure that we locate an advertised address to use
|
|
// within the peer's address for reconnection purposes.
|
|
//
|
|
// TODO(roasbeef): use them all?
|
|
if p.inbound {
|
|
advertisedAddr, err := s.fetchNodeAdvertisedAddr(
|
|
pubKey,
|
|
)
|
|
if err != nil {
|
|
srvrLog.Errorf("Unable to retrieve advertised "+
|
|
"address for node %x: %v",
|
|
pubKey.SerializeCompressed(), err)
|
|
} else {
|
|
p.addr.Address = advertisedAddr
|
|
}
|
|
}
|
|
|
|
// Otherwise, we'll launch a new connection request in order to
|
|
// attempt to maintain a persistent connection with this peer.
|
|
connReq := &connmgr.ConnReq{
|
|
Addr: p.addr,
|
|
Permanent: true,
|
|
}
|
|
s.persistentConnReqs[pubStr] = append(
|
|
s.persistentConnReqs[pubStr], connReq)
|
|
|
|
// Record the computed backoff in the backoff map.
|
|
backoff := s.nextPeerBackoff(pubStr, p.StartTime())
|
|
s.persistentPeersBackoff[pubStr] = backoff
|
|
|
|
// Initialize a retry canceller for this peer if one does not
|
|
// exist.
|
|
cancelChan, ok := s.persistentRetryCancels[pubStr]
|
|
if !ok {
|
|
cancelChan = make(chan struct{})
|
|
s.persistentRetryCancels[pubStr] = cancelChan
|
|
}
|
|
|
|
// We choose not to wait group this go routine since the Connect
|
|
// call can stall for arbitrarily long if we shutdown while an
|
|
// outbound connection attempt is being made.
|
|
go func() {
|
|
srvrLog.Debugf("Scheduling connection re-establishment to "+
|
|
"persistent peer %v in %s", p, backoff)
|
|
|
|
select {
|
|
case <-time.After(backoff):
|
|
case <-cancelChan:
|
|
return
|
|
case <-s.quit:
|
|
return
|
|
}
|
|
|
|
srvrLog.Debugf("Attempting to re-establish persistent "+
|
|
"connection to peer %v", p)
|
|
|
|
s.connMgr.Connect(connReq)
|
|
}()
|
|
}
|
|
}
|
|
|
|
// removePeer removes the passed peer from the server's state of all active
|
|
// peers.
|
|
func (s *server) removePeer(p *peer) {
|
|
if p == nil {
|
|
return
|
|
}
|
|
|
|
srvrLog.Debugf("removing peer %v", p)
|
|
|
|
// As the peer is now finished, ensure that the TCP connection is
|
|
// closed and all of its related goroutines have exited.
|
|
p.Disconnect(fmt.Errorf("server: disconnecting peer %v", p))
|
|
|
|
// If this peer had an active persistent connection request, remove it.
|
|
if p.connReq != nil {
|
|
s.connMgr.Remove(p.connReq.ID())
|
|
}
|
|
|
|
// Ignore deleting peers if we're shutting down.
|
|
if s.Stopped() {
|
|
return
|
|
}
|
|
|
|
pubStr := string(p.addr.IdentityKey.SerializeCompressed())
|
|
|
|
delete(s.peersByPub, pubStr)
|
|
|
|
if p.inbound {
|
|
delete(s.inboundPeers, pubStr)
|
|
} else {
|
|
delete(s.outboundPeers, pubStr)
|
|
}
|
|
}
|
|
|
|
// openChanReq is a message sent to the server in order to request the
|
|
// initiation of a channel funding workflow to the peer with either the
|
|
// specified relative peer ID, or a global lightning ID.
|
|
type openChanReq struct {
|
|
targetPubkey *btcec.PublicKey
|
|
|
|
chainHash chainhash.Hash
|
|
|
|
localFundingAmt btcutil.Amount
|
|
remoteFundingAmt btcutil.Amount
|
|
|
|
pushAmt lnwire.MilliSatoshi
|
|
|
|
fundingFeePerKw lnwallet.SatPerKWeight
|
|
|
|
private bool
|
|
|
|
minHtlc lnwire.MilliSatoshi
|
|
|
|
remoteCsvDelay uint16
|
|
|
|
// minConfs indicates the minimum number of confirmations that each
|
|
// output selected to fund the channel should satisfy.
|
|
minConfs int32
|
|
|
|
// TODO(roasbeef): add ability to specify channel constraints as well
|
|
|
|
updates chan *lnrpc.OpenStatusUpdate
|
|
err chan error
|
|
}
|
|
|
|
// ConnectToPeer requests that the server connect to a Lightning Network peer
|
|
// at the specified address. This function will *block* until either a
|
|
// connection is established, or the initial handshake process fails.
|
|
//
|
|
// NOTE: This function is safe for concurrent access.
|
|
func (s *server) ConnectToPeer(addr *lnwire.NetAddress, perm bool) error {
|
|
|
|
targetPub := string(addr.IdentityKey.SerializeCompressed())
|
|
|
|
// Acquire mutex, but use explicit unlocking instead of defer for
|
|
// better granularity. In certain conditions, this method requires
|
|
// making an outbound connection to a remote peer, which requires the
|
|
// lock to be released, and subsequently reacquired.
|
|
s.mu.Lock()
|
|
|
|
// Ensure we're not already connected to this peer.
|
|
peer, err := s.findPeerByPubStr(targetPub)
|
|
if err == nil {
|
|
s.mu.Unlock()
|
|
return fmt.Errorf("already connected to peer: %v", peer)
|
|
}
|
|
|
|
// Peer was not found, continue to pursue connection with peer.
|
|
|
|
// If there's already a pending connection request for this pubkey,
|
|
// then we ignore this request to ensure we don't create a redundant
|
|
// connection.
|
|
if reqs, ok := s.persistentConnReqs[targetPub]; ok {
|
|
srvrLog.Warnf("Already have %d persistent connection "+
|
|
"requests for %v, connecting anyway.", len(reqs), addr)
|
|
}
|
|
|
|
// If there's not already a pending or active connection to this node,
|
|
// then instruct the connection manager to attempt to establish a
|
|
// persistent connection to the peer.
|
|
srvrLog.Debugf("Connecting to %v", addr)
|
|
if perm {
|
|
connReq := &connmgr.ConnReq{
|
|
Addr: addr,
|
|
Permanent: true,
|
|
}
|
|
|
|
s.persistentPeers[targetPub] = struct{}{}
|
|
if _, ok := s.persistentPeersBackoff[targetPub]; !ok {
|
|
s.persistentPeersBackoff[targetPub] = defaultBackoff
|
|
}
|
|
s.persistentConnReqs[targetPub] = append(
|
|
s.persistentConnReqs[targetPub], connReq)
|
|
s.mu.Unlock()
|
|
|
|
go s.connMgr.Connect(connReq)
|
|
|
|
return nil
|
|
}
|
|
s.mu.Unlock()
|
|
|
|
// If we're not making a persistent connection, then we'll attempt to
|
|
// connect to the target peer. If the we can't make the connection, or
|
|
// the crypto negotiation breaks down, then return an error to the
|
|
// caller.
|
|
errChan := make(chan error, 1)
|
|
s.connectToPeer(addr, errChan)
|
|
|
|
select {
|
|
case err := <-errChan:
|
|
return err
|
|
case <-s.quit:
|
|
return ErrServerShuttingDown
|
|
}
|
|
}
|
|
|
|
// connectToPeer establishes a connection to a remote peer. errChan is used to
|
|
// notify the caller if the connection attempt has failed. Otherwise, it will be
|
|
// closed.
|
|
func (s *server) connectToPeer(addr *lnwire.NetAddress, errChan chan<- error) {
|
|
conn, err := brontide.Dial(s.identityPriv, addr, cfg.net.Dial)
|
|
if err != nil {
|
|
srvrLog.Errorf("Unable to connect to %v: %v", addr, err)
|
|
select {
|
|
case errChan <- err:
|
|
case <-s.quit:
|
|
}
|
|
return
|
|
}
|
|
|
|
close(errChan)
|
|
|
|
s.OutboundPeerConnected(nil, conn)
|
|
}
|
|
|
|
// DisconnectPeer sends the request to server to close the connection with peer
|
|
// identified by public key.
|
|
//
|
|
// NOTE: This function is safe for concurrent access.
|
|
func (s *server) DisconnectPeer(pubKey *btcec.PublicKey) error {
|
|
pubBytes := pubKey.SerializeCompressed()
|
|
pubStr := string(pubBytes)
|
|
|
|
s.mu.Lock()
|
|
defer s.mu.Unlock()
|
|
|
|
// Check that were actually connected to this peer. If not, then we'll
|
|
// exit in an error as we can't disconnect from a peer that we're not
|
|
// currently connected to.
|
|
peer, err := s.findPeerByPubStr(pubStr)
|
|
if err == ErrPeerNotConnected {
|
|
return fmt.Errorf("peer %x is not connected", pubBytes)
|
|
}
|
|
|
|
srvrLog.Infof("Disconnecting from %v", peer)
|
|
|
|
s.cancelConnReqs(pubStr, nil)
|
|
|
|
// If this peer was formerly a persistent connection, then we'll remove
|
|
// them from this map so we don't attempt to re-connect after we
|
|
// disconnect.
|
|
delete(s.persistentPeers, pubStr)
|
|
delete(s.persistentPeersBackoff, pubStr)
|
|
|
|
// Remove the current peer from the server's internal state and signal
|
|
// that the peer termination watcher does not need to execute for this
|
|
// peer.
|
|
s.removePeer(peer)
|
|
s.ignorePeerTermination[peer] = struct{}{}
|
|
|
|
return nil
|
|
}
|
|
|
|
// OpenChannel sends a request to the server to open a channel to the specified
|
|
// peer identified by nodeKey with the passed channel funding parameters.
|
|
//
|
|
// NOTE: This function is safe for concurrent access.
|
|
func (s *server) OpenChannel(
|
|
req *openChanReq) (chan *lnrpc.OpenStatusUpdate, chan error) {
|
|
|
|
// The updateChan will have a buffer of 2, since we expect a ChanPending
|
|
// + a ChanOpen update, and we want to make sure the funding process is
|
|
// not blocked if the caller is not reading the updates.
|
|
req.updates = make(chan *lnrpc.OpenStatusUpdate, 2)
|
|
req.err = make(chan error, 1)
|
|
|
|
// First attempt to locate the target peer to open a channel with, if
|
|
// we're unable to locate the peer then this request will fail.
|
|
pubKeyBytes := req.targetPubkey.SerializeCompressed()
|
|
s.mu.RLock()
|
|
peer, ok := s.peersByPub[string(pubKeyBytes)]
|
|
if !ok {
|
|
s.mu.RUnlock()
|
|
|
|
req.err <- fmt.Errorf("peer %x is not online", pubKeyBytes)
|
|
return req.updates, req.err
|
|
}
|
|
s.mu.RUnlock()
|
|
|
|
// If the fee rate wasn't specified, then we'll use a default
|
|
// confirmation target.
|
|
if req.fundingFeePerKw == 0 {
|
|
estimator := s.cc.feeEstimator
|
|
feeRate, err := estimator.EstimateFeePerKW(6)
|
|
if err != nil {
|
|
req.err <- err
|
|
return req.updates, req.err
|
|
}
|
|
req.fundingFeePerKw = feeRate
|
|
}
|
|
|
|
// Spawn a goroutine to send the funding workflow request to the funding
|
|
// manager. This allows the server to continue handling queries instead
|
|
// of blocking on this request which is exported as a synchronous
|
|
// request to the outside world.
|
|
go s.fundingMgr.initFundingWorkflow(peer, req)
|
|
|
|
return req.updates, req.err
|
|
}
|
|
|
|
// Peers returns a slice of all active peers.
|
|
//
|
|
// NOTE: This function is safe for concurrent access.
|
|
func (s *server) Peers() []*peer {
|
|
s.mu.RLock()
|
|
defer s.mu.RUnlock()
|
|
|
|
peers := make([]*peer, 0, len(s.peersByPub))
|
|
for _, peer := range s.peersByPub {
|
|
peers = append(peers, peer)
|
|
}
|
|
|
|
return peers
|
|
}
|
|
|
|
// parseHexColor takes a hex string representation of a color in the
|
|
// form "#RRGGBB", parses the hex color values, and returns a color.RGBA
|
|
// struct of the same color.
|
|
func parseHexColor(colorStr string) (color.RGBA, error) {
|
|
if len(colorStr) != 7 || colorStr[0] != '#' {
|
|
return color.RGBA{}, errors.New("Color must be in format #RRGGBB")
|
|
}
|
|
|
|
// Decode the hex color string to bytes.
|
|
// The resulting byte array is in the form [R, G, B].
|
|
colorBytes, err := hex.DecodeString(colorStr[1:])
|
|
if err != nil {
|
|
return color.RGBA{}, err
|
|
}
|
|
|
|
return color.RGBA{R: colorBytes[0], G: colorBytes[1], B: colorBytes[2]}, nil
|
|
}
|
|
|
|
// computeNextBackoff uses a truncated exponential backoff to compute the next
|
|
// backoff using the value of the exiting backoff. The returned duration is
|
|
// randomized in either direction by 1/20 to prevent tight loops from
|
|
// stabilizing.
|
|
func computeNextBackoff(currBackoff time.Duration) time.Duration {
|
|
// Double the current backoff, truncating if it exceeds our maximum.
|
|
nextBackoff := 2 * currBackoff
|
|
if nextBackoff > maximumBackoff {
|
|
nextBackoff = maximumBackoff
|
|
}
|
|
|
|
// Using 1/10 of our duration as a margin, compute a random offset to
|
|
// avoid the nodes entering connection cycles.
|
|
margin := nextBackoff / 10
|
|
|
|
var wiggle big.Int
|
|
wiggle.SetUint64(uint64(margin))
|
|
if _, err := rand.Int(rand.Reader, &wiggle); err != nil {
|
|
// Randomizing is not mission critical, so we'll just return the
|
|
// current backoff.
|
|
return nextBackoff
|
|
}
|
|
|
|
// Otherwise add in our wiggle, but subtract out half of the margin so
|
|
// that the backoff can tweaked by 1/20 in either direction.
|
|
return nextBackoff + (time.Duration(wiggle.Uint64()) - margin/2)
|
|
}
|
|
|
|
// fetchNodeAdvertisedAddr attempts to fetch an advertised address of a node.
|
|
func (s *server) fetchNodeAdvertisedAddr(pub *btcec.PublicKey) (net.Addr, error) {
|
|
node, err := s.chanDB.ChannelGraph().FetchLightningNode(pub)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if len(node.Addresses) == 0 {
|
|
return nil, errors.New("no advertised addresses found")
|
|
}
|
|
|
|
return node.Addresses[0], nil
|
|
}
|
|
|
|
// announceChanStatus disables a channel if disabled=true, otherwise activates
|
|
// it. This is done by sending a new channel update across the network with the
|
|
// disabled flag set accordingly. The result of disabling the channel is it not
|
|
// being able to forward payments.
|
|
func (s *server) announceChanStatus(op wire.OutPoint, disabled bool) error {
|
|
s.sentDisabledMtx.Lock()
|
|
defer s.sentDisabledMtx.Unlock()
|
|
|
|
// If we have already sent out an update reflecting the current status,
|
|
// skip this channel.
|
|
alreadyDisabled, ok := s.sentDisabled[op]
|
|
if ok && alreadyDisabled == disabled {
|
|
return nil
|
|
}
|
|
|
|
srvrLog.Debugf("Announcing channel(%v) disabled=%v", op, disabled)
|
|
|
|
// Retrieve the latest update for this channel. We'll use this
|
|
// as our starting point to send the new update.
|
|
chanUpdate, err := s.fetchLastChanUpdateByOutPoint(op)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if disabled {
|
|
// Set the bit responsible for marking a channel as disabled.
|
|
chanUpdate.Flags |= lnwire.ChanUpdateDisabled
|
|
} else {
|
|
// Clear the bit responsible for marking a channel as disabled.
|
|
chanUpdate.Flags &= ^lnwire.ChanUpdateDisabled
|
|
}
|
|
|
|
// We must now update the message's timestamp and generate a new
|
|
// signature.
|
|
newTimestamp := uint32(time.Now().Unix())
|
|
if newTimestamp <= chanUpdate.Timestamp {
|
|
// Timestamp must increase for message to propagate.
|
|
newTimestamp = chanUpdate.Timestamp + 1
|
|
}
|
|
chanUpdate.Timestamp = newTimestamp
|
|
|
|
chanUpdateMsg, err := chanUpdate.DataToSign()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
pubKey := s.identityPriv.PubKey()
|
|
sig, err := s.nodeSigner.SignMessage(pubKey, chanUpdateMsg)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
chanUpdate.Signature, err = lnwire.NewSigFromSignature(sig)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Once signed, we'll send the new update to all of our peers.
|
|
if err := s.applyChannelUpdate(chanUpdate); err != nil {
|
|
return err
|
|
}
|
|
|
|
// We'll keep track of the status set in the last update we sent, to
|
|
// avoid sending updates if nothing has changed.
|
|
s.sentDisabled[op] = disabled
|
|
|
|
return nil
|
|
}
|
|
|
|
// fetchLastChanUpdateByOutPoint fetches the latest policy for our direction of
|
|
// a channel, and crafts a new ChannelUpdate with this policy. Returns an error
|
|
// in case our ChannelEdgePolicy is not found in the database.
|
|
func (s *server) fetchLastChanUpdateByOutPoint(op wire.OutPoint) (
|
|
*lnwire.ChannelUpdate, error) {
|
|
|
|
// Get the edge info and policies for this channel from the graph.
|
|
graph := s.chanDB.ChannelGraph()
|
|
info, edge1, edge2, err := graph.FetchChannelEdgesByOutpoint(&op)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
pubKey := s.identityPriv.PubKey().SerializeCompressed()
|
|
return extractChannelUpdate(pubKey, info, edge1, edge2)
|
|
}
|
|
|
|
// fetchLastChanUpdate returns a function which is able to retrieve our latest
|
|
// channel update for a target channel.
|
|
func (s *server) fetchLastChanUpdate() func(lnwire.ShortChannelID) (
|
|
*lnwire.ChannelUpdate, error) {
|
|
|
|
ourPubKey := s.identityPriv.PubKey().SerializeCompressed()
|
|
return func(cid lnwire.ShortChannelID) (*lnwire.ChannelUpdate, error) {
|
|
info, edge1, edge2, err := s.chanRouter.GetChannelByID(cid)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return extractChannelUpdate(ourPubKey[:], info, edge1, edge2)
|
|
}
|
|
}
|
|
|
|
// extractChannelUpdate attempts to retrieve a lnwire.ChannelUpdate message
|
|
// from an edge's info and a set of routing policies.
|
|
// NOTE: the passed policies can be nil.
|
|
func extractChannelUpdate(ownerPubKey []byte,
|
|
info *channeldb.ChannelEdgeInfo,
|
|
policies ...*channeldb.ChannelEdgePolicy) (
|
|
*lnwire.ChannelUpdate, error) {
|
|
|
|
// Helper function to extract the owner of the given policy.
|
|
owner := func(edge *channeldb.ChannelEdgePolicy) []byte {
|
|
var pubKey *btcec.PublicKey
|
|
switch {
|
|
case edge.Flags&lnwire.ChanUpdateDirection == 0:
|
|
pubKey, _ = info.NodeKey1()
|
|
case edge.Flags&lnwire.ChanUpdateDirection == 1:
|
|
pubKey, _ = info.NodeKey2()
|
|
}
|
|
|
|
// If pubKey was not found, just return nil.
|
|
if pubKey == nil {
|
|
return nil
|
|
}
|
|
|
|
return pubKey.SerializeCompressed()
|
|
}
|
|
|
|
// Extract the channel update from the policy we own, if any.
|
|
for _, edge := range policies {
|
|
if edge != nil && bytes.Equal(ownerPubKey, owner(edge)) {
|
|
return createChannelUpdate(info, edge)
|
|
}
|
|
}
|
|
|
|
return nil, fmt.Errorf("unable to extract ChannelUpdate for channel %v",
|
|
info.ChannelPoint)
|
|
}
|
|
|
|
// createChannelUpdate reconstructs a signed ChannelUpdate from the given edge
|
|
// info and policy.
|
|
func createChannelUpdate(info *channeldb.ChannelEdgeInfo,
|
|
policy *channeldb.ChannelEdgePolicy) (*lnwire.ChannelUpdate, error) {
|
|
|
|
update := &lnwire.ChannelUpdate{
|
|
ChainHash: info.ChainHash,
|
|
ShortChannelID: lnwire.NewShortChanIDFromInt(policy.ChannelID),
|
|
Timestamp: uint32(policy.LastUpdate.Unix()),
|
|
Flags: policy.Flags,
|
|
TimeLockDelta: policy.TimeLockDelta,
|
|
HtlcMinimumMsat: policy.MinHTLC,
|
|
BaseFee: uint32(policy.FeeBaseMSat),
|
|
FeeRate: uint32(policy.FeeProportionalMillionths),
|
|
}
|
|
|
|
var err error
|
|
update.Signature, err = lnwire.NewSigFromRawSignature(policy.SigBytes)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return update, nil
|
|
}
|
|
|
|
// applyChannelUpdate applies the channel update to the different sub-systems of
|
|
// the server.
|
|
func (s *server) applyChannelUpdate(update *lnwire.ChannelUpdate) error {
|
|
pubKey := s.identityPriv.PubKey()
|
|
errChan := s.authGossiper.ProcessLocalAnnouncement(update, pubKey)
|
|
select {
|
|
case err := <-errChan:
|
|
return err
|
|
case <-s.quit:
|
|
return ErrServerShuttingDown
|
|
}
|
|
}
|
|
|
|
// watchChannelStatus periodically queries the Switch for the status of the
|
|
// open channels, and sends out ChannelUpdates to the network indicating their
|
|
// active status. Currently we'll send out either a Disabled or Active update
|
|
// if the channel has been in the same status over a given amount of time.
|
|
//
|
|
// NOTE: This MUST be run as a goroutine.
|
|
func (s *server) watchChannelStatus() {
|
|
defer s.wg.Done()
|
|
|
|
// A map with values activeStatus is used to keep track of the first
|
|
// time we saw a link changing to the current active status.
|
|
type activeStatus struct {
|
|
active bool
|
|
time time.Time
|
|
}
|
|
status := make(map[wire.OutPoint]activeStatus)
|
|
|
|
// We'll check in on the channel statuses every 1/4 of the timeout.
|
|
unchangedTimeout := cfg.InactiveChanTimeout
|
|
tickerTimeout := unchangedTimeout / 4
|
|
|
|
if unchangedTimeout == 0 || tickerTimeout == 0 {
|
|
srvrLog.Debugf("Won't watch channel statuses")
|
|
return
|
|
}
|
|
|
|
ticker := time.NewTicker(tickerTimeout)
|
|
defer ticker.Stop()
|
|
|
|
for {
|
|
select {
|
|
case <-ticker.C:
|
|
channels, err := s.chanDB.FetchAllOpenChannels()
|
|
if err != nil {
|
|
srvrLog.Errorf("Unable to fetch open "+
|
|
"channels: %v", err)
|
|
continue
|
|
}
|
|
|
|
// For each open channel, update the status. We'll copy
|
|
// the updated statuses to a new map, to avoid keeping
|
|
// the status of closed channels around.
|
|
newStatus := make(map[wire.OutPoint]activeStatus)
|
|
for _, c := range channels {
|
|
// We'll skip any private channels, as they
|
|
// aren't used for routing within the network
|
|
// by other nodes.
|
|
if c.ChannelFlags&lnwire.FFAnnounceChannel == 0 {
|
|
continue
|
|
}
|
|
|
|
chanID := lnwire.NewChanIDFromOutPoint(
|
|
&c.FundingOutpoint)
|
|
|
|
// Get the current active stauts from the
|
|
// Switch.
|
|
active := s.htlcSwitch.HasActiveLink(chanID)
|
|
|
|
var currentStatus activeStatus
|
|
|
|
// If this link is not in the map, or the
|
|
// status has changed, set an updated active
|
|
// status.
|
|
st, ok := status[c.FundingOutpoint]
|
|
if !ok || st.active != active {
|
|
currentStatus = activeStatus{
|
|
active: active,
|
|
time: time.Now(),
|
|
}
|
|
} else {
|
|
// The status is unchanged, we'll keep
|
|
// it as is.
|
|
currentStatus = st
|
|
}
|
|
|
|
newStatus[c.FundingOutpoint] = currentStatus
|
|
}
|
|
|
|
// Set the status map to the map of new statuses.
|
|
status = newStatus
|
|
|
|
// If no change in status has happened during the last
|
|
// interval, we'll send out an update. Note that we add
|
|
// the negative of the timeout to set our limit in the
|
|
// past.
|
|
limit := time.Now().Add(-unchangedTimeout)
|
|
|
|
// We'll send out an update for all channels that have
|
|
// had their status unchanged for longer than the limit.
|
|
// NOTE: We also make sure to activate any channel when
|
|
// we connect to a peer, to make them available for
|
|
// path finding immediately.
|
|
for op, st := range status {
|
|
disable := !st.active
|
|
|
|
if st.time.Before(limit) {
|
|
// Before we attempt to announce the
|
|
// status of the channel, we remove it
|
|
// from the status map such that it
|
|
// will need a full unchaged interval
|
|
// before we attempt to announce its
|
|
// status again.
|
|
delete(status, op)
|
|
|
|
err = s.announceChanStatus(op, disable)
|
|
if err != nil {
|
|
srvrLog.Errorf("Unable to "+
|
|
"disable channel: %v",
|
|
err)
|
|
}
|
|
}
|
|
}
|
|
|
|
case <-s.quit:
|
|
return
|
|
}
|
|
}
|
|
}
|