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1039 lines
29 KiB
1039 lines
29 KiB
package p2p
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import (
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"context"
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"fmt"
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"io"
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"math"
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"net"
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"sync"
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"time"
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"github.com/tendermint/tendermint/config"
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"github.com/tendermint/tendermint/crypto"
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"github.com/tendermint/tendermint/libs/cmap"
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"github.com/tendermint/tendermint/libs/rand"
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"github.com/tendermint/tendermint/libs/service"
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"github.com/tendermint/tendermint/p2p/conn"
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)
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const (
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// wait a random amount of time from this interval
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// before dialing peers or reconnecting to help prevent DoS
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dialRandomizerIntervalMilliseconds = 3000
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// repeatedly try to reconnect for a few minutes
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// ie. 5 * 20 = 100s
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reconnectAttempts = 20
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reconnectInterval = 5 * time.Second
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// then move into exponential backoff mode for ~1day
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// ie. 3**10 = 16hrs
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reconnectBackOffAttempts = 10
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reconnectBackOffBaseSeconds = 3
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defaultFilterTimeout = 5 * time.Second
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)
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// MConnConfig returns an MConnConfig with fields updated
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// from the P2PConfig.
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func MConnConfig(cfg *config.P2PConfig) conn.MConnConfig {
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mConfig := conn.DefaultMConnConfig()
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mConfig.FlushThrottle = cfg.FlushThrottleTimeout
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mConfig.SendRate = cfg.SendRate
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mConfig.RecvRate = cfg.RecvRate
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mConfig.MaxPacketMsgPayloadSize = cfg.MaxPacketMsgPayloadSize
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return mConfig
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}
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//-----------------------------------------------------------------------------
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// An AddrBook represents an address book from the pex package, which is used
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// to store peer addresses.
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type AddrBook interface {
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AddAddress(addr *NetAddress, src *NetAddress) error
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AddPrivateIDs([]string)
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AddOurAddress(*NetAddress)
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OurAddress(*NetAddress) bool
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MarkGood(NodeID)
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RemoveAddress(*NetAddress)
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HasAddress(*NetAddress) bool
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Save()
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}
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// ConnFilterFunc is a callback for connection filtering. If it returns an
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// error, the connection is rejected. The set of existing connections is passed
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// along with the new connection and all resolved IPs.
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type ConnFilterFunc func(ConnSet, net.Conn, []net.IP) error
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// PeerFilterFunc to be implemented by filter hooks after a new Peer has been
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// fully setup.
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type PeerFilterFunc func(IPeerSet, Peer) error
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// ConnDuplicateIPFilter resolves and keeps all ips for an incoming connection
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// and refuses new ones if they come from a known ip.
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var ConnDuplicateIPFilter ConnFilterFunc = func(cs ConnSet, c net.Conn, ips []net.IP) error {
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for _, ip := range ips {
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if cs.HasIP(ip) {
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return ErrRejected{
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conn: c,
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err: fmt.Errorf("ip<%v> already connected", ip),
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isDuplicate: true,
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}
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}
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}
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return nil
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}
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//-----------------------------------------------------------------------------
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// Switch handles peer connections and exposes an API to receive incoming messages
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// on `Reactors`. Each `Reactor` is responsible for handling incoming messages of one
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// or more `Channels`. So while sending outgoing messages is typically performed on the peer,
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// incoming messages are received on the reactor.
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type Switch struct {
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service.BaseService
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config *config.P2PConfig
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reactors map[string]Reactor
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chDescs []*conn.ChannelDescriptor
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reactorsByCh map[byte]Reactor
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peers *PeerSet
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dialing *cmap.CMap
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reconnecting *cmap.CMap
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nodeInfo NodeInfo // our node info
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nodeKey NodeKey // our node privkey
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addrBook AddrBook
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// peers addresses with whom we'll maintain constant connection
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persistentPeersAddrs []*NetAddress
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unconditionalPeerIDs map[NodeID]struct{}
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transport Transport
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filterTimeout time.Duration
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peerFilters []PeerFilterFunc
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connFilters []ConnFilterFunc
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conns ConnSet
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rng *rand.Rand // seed for randomizing dial times and orders
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metrics *Metrics
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}
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// NetAddress returns the first address the switch is listening on,
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// or nil if no addresses are found.
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func (sw *Switch) NetAddress() *NetAddress {
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endpoints := sw.transport.Endpoints()
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if len(endpoints) == 0 {
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return nil
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}
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return &NetAddress{
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ID: sw.nodeInfo.NodeID,
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IP: endpoints[0].IP,
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Port: endpoints[0].Port,
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}
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}
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// SwitchOption sets an optional parameter on the Switch.
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type SwitchOption func(*Switch)
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// NewSwitch creates a new Switch with the given config.
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func NewSwitch(
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cfg *config.P2PConfig,
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transport Transport,
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options ...SwitchOption,
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) *Switch {
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sw := &Switch{
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config: cfg,
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reactors: make(map[string]Reactor),
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chDescs: make([]*conn.ChannelDescriptor, 0),
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reactorsByCh: make(map[byte]Reactor),
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peers: NewPeerSet(),
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dialing: cmap.NewCMap(),
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reconnecting: cmap.NewCMap(),
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metrics: NopMetrics(),
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transport: transport,
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persistentPeersAddrs: make([]*NetAddress, 0),
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unconditionalPeerIDs: make(map[NodeID]struct{}),
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filterTimeout: defaultFilterTimeout,
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conns: NewConnSet(),
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}
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// Ensure we have a completely undeterministic PRNG.
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sw.rng = rand.NewRand()
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sw.BaseService = *service.NewBaseService(nil, "P2P Switch", sw)
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for _, option := range options {
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option(sw)
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}
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return sw
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}
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// SwitchFilterTimeout sets the timeout used for peer filters.
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func SwitchFilterTimeout(timeout time.Duration) SwitchOption {
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return func(sw *Switch) { sw.filterTimeout = timeout }
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}
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// SwitchPeerFilters sets the filters for rejection of new peers.
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func SwitchPeerFilters(filters ...PeerFilterFunc) SwitchOption {
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return func(sw *Switch) { sw.peerFilters = filters }
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}
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// SwitchConnFilters sets the filters for rejection of connections.
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func SwitchConnFilters(filters ...ConnFilterFunc) SwitchOption {
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return func(sw *Switch) { sw.connFilters = filters }
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}
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// WithMetrics sets the metrics.
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func WithMetrics(metrics *Metrics) SwitchOption {
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return func(sw *Switch) { sw.metrics = metrics }
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}
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//---------------------------------------------------------------------
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// Switch setup
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// AddReactor adds the given reactor to the switch.
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// NOTE: Not goroutine safe.
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func (sw *Switch) AddReactor(name string, reactor Reactor) Reactor {
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for _, chDesc := range reactor.GetChannels() {
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chID := chDesc.ID
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// No two reactors can share the same channel.
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if sw.reactorsByCh[chID] != nil {
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panic(fmt.Sprintf("Channel %X has multiple reactors %v & %v", chID, sw.reactorsByCh[chID], reactor))
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}
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sw.chDescs = append(sw.chDescs, chDesc)
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sw.reactorsByCh[chID] = reactor
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}
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sw.reactors[name] = reactor
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reactor.SetSwitch(sw)
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return reactor
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}
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// RemoveReactor removes the given Reactor from the Switch.
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// NOTE: Not goroutine safe.
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func (sw *Switch) RemoveReactor(name string, reactor Reactor) {
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for _, chDesc := range reactor.GetChannels() {
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// remove channel description
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for i := 0; i < len(sw.chDescs); i++ {
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if chDesc.ID == sw.chDescs[i].ID {
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sw.chDescs = append(sw.chDescs[:i], sw.chDescs[i+1:]...)
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break
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}
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}
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delete(sw.reactorsByCh, chDesc.ID)
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}
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delete(sw.reactors, name)
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reactor.SetSwitch(nil)
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}
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// Reactors returns a map of reactors registered on the switch.
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// NOTE: Not goroutine safe.
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func (sw *Switch) Reactors() map[string]Reactor {
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return sw.reactors
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}
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// Reactor returns the reactor with the given name.
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// NOTE: Not goroutine safe.
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func (sw *Switch) Reactor(name string) Reactor {
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return sw.reactors[name]
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}
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// SetNodeInfo sets the switch's NodeInfo for checking compatibility and handshaking with other nodes.
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// NOTE: Not goroutine safe.
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func (sw *Switch) SetNodeInfo(nodeInfo NodeInfo) {
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sw.nodeInfo = nodeInfo
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}
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// NodeInfo returns the switch's NodeInfo.
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// NOTE: Not goroutine safe.
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func (sw *Switch) NodeInfo() NodeInfo {
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return sw.nodeInfo
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}
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// SetNodeKey sets the switch's private key for authenticated encryption.
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// NOTE: Not goroutine safe.
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func (sw *Switch) SetNodeKey(nodeKey NodeKey) {
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sw.nodeKey = nodeKey
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}
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//---------------------------------------------------------------------
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// Service start/stop
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// OnStart implements BaseService. It starts all the reactors and peers.
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func (sw *Switch) OnStart() error {
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// FIXME: Temporary hack to pass channel descriptors to MConn transport,
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// since they are not available when it is constructed. This will be
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// fixed when we implement the new router abstraction.
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if t, ok := sw.transport.(*MConnTransport); ok {
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t.channelDescs = sw.chDescs
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}
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// Start reactors
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for _, reactor := range sw.reactors {
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err := reactor.Start()
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if err != nil {
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return fmt.Errorf("failed to start %v: %w", reactor, err)
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}
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}
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// Start accepting Peers.
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go sw.acceptRoutine()
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return nil
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}
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// OnStop implements BaseService. It stops all peers and reactors.
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func (sw *Switch) OnStop() {
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// Stop peers
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for _, p := range sw.peers.List() {
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sw.stopAndRemovePeer(p, nil)
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}
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// Stop reactors
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sw.Logger.Debug("Switch: Stopping reactors")
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for _, reactor := range sw.reactors {
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if err := reactor.Stop(); err != nil {
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sw.Logger.Error("error while stopping reactor", "reactor", reactor, "error", err)
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}
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}
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}
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//---------------------------------------------------------------------
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// Peers
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// Broadcast runs a go routine for each attempted send, which will block trying
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// to send for defaultSendTimeoutSeconds. Returns a channel which receives
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// success values for each attempted send (false if times out). Channel will be
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// closed once msg bytes are sent to all peers (or time out).
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//
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// NOTE: Broadcast uses goroutines, so order of broadcast may not be preserved.
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func (sw *Switch) Broadcast(chID byte, msgBytes []byte) chan bool {
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sw.Logger.Debug("Broadcast", "channel", chID, "msgBytes", msgBytes)
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peers := sw.peers.List()
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var wg sync.WaitGroup
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wg.Add(len(peers))
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successChan := make(chan bool, len(peers))
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for _, peer := range peers {
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go func(p Peer) {
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defer wg.Done()
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success := p.Send(chID, msgBytes)
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successChan <- success
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}(peer)
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}
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go func() {
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wg.Wait()
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close(successChan)
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}()
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return successChan
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}
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// NumPeers returns the count of outbound/inbound and outbound-dialing peers.
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// unconditional peers are not counted here.
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func (sw *Switch) NumPeers() (outbound, inbound, dialing int) {
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peers := sw.peers.List()
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for _, peer := range peers {
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if peer.IsOutbound() {
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if !sw.IsPeerUnconditional(peer.ID()) {
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outbound++
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}
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} else {
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if !sw.IsPeerUnconditional(peer.ID()) {
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inbound++
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}
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}
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}
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dialing = sw.dialing.Size()
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return
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}
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func (sw *Switch) IsPeerUnconditional(id NodeID) bool {
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_, ok := sw.unconditionalPeerIDs[id]
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return ok
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}
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// MaxNumOutboundPeers returns a maximum number of outbound peers.
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func (sw *Switch) MaxNumOutboundPeers() int {
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return sw.config.MaxNumOutboundPeers
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}
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// Peers returns the set of peers that are connected to the switch.
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func (sw *Switch) Peers() IPeerSet {
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return sw.peers
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}
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// StopPeerForError disconnects from a peer due to external error.
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// If the peer is persistent, it will attempt to reconnect.
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// TODO: make record depending on reason.
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func (sw *Switch) StopPeerForError(peer Peer, reason interface{}) {
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if !peer.IsRunning() {
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return
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}
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sw.Logger.Error("Stopping peer for error", "peer", peer, "err", reason)
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sw.stopAndRemovePeer(peer, reason)
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if peer.IsPersistent() {
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var addr *NetAddress
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if peer.IsOutbound() { // socket address for outbound peers
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addr = peer.SocketAddr()
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} else { // self-reported address for inbound peers
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var err error
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addr, err = peer.NodeInfo().NetAddress()
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if err != nil {
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sw.Logger.Error("Wanted to reconnect to inbound peer, but self-reported address is wrong",
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"peer", peer, "err", err)
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return
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}
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}
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go sw.reconnectToPeer(addr)
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}
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}
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// StopPeerGracefully disconnects from a peer gracefully.
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// TODO: handle graceful disconnects.
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func (sw *Switch) StopPeerGracefully(peer Peer) {
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sw.Logger.Info("Stopping peer gracefully")
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sw.stopAndRemovePeer(peer, nil)
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}
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func (sw *Switch) stopAndRemovePeer(peer Peer, reason interface{}) {
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if err := peer.Stop(); err != nil {
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sw.Logger.Error("error while stopping peer", "error", err) // TODO: should return error to be handled accordingly
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}
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for _, reactor := range sw.reactors {
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reactor.RemovePeer(peer, reason)
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}
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// Removing a peer should go last to avoid a situation where a peer
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// reconnect to our node and the switch calls InitPeer before
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// RemovePeer is finished.
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// https://github.com/tendermint/tendermint/issues/3338
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if sw.peers.Remove(peer) {
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sw.metrics.Peers.Add(float64(-1))
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}
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sw.conns.RemoveAddr(peer.RemoteAddr())
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}
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// reconnectToPeer tries to reconnect to the addr, first repeatedly
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// with a fixed interval, then with exponential backoff.
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// If no success after all that, it stops trying, and leaves it
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// to the PEX/Addrbook to find the peer with the addr again
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// NOTE: this will keep trying even if the handshake or auth fails.
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// TODO: be more explicit with error types so we only retry on certain failures
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// - ie. if we're getting ErrDuplicatePeer we can stop
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// because the addrbook got us the peer back already
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func (sw *Switch) reconnectToPeer(addr *NetAddress) {
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if sw.reconnecting.Has(string(addr.ID)) {
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return
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}
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sw.reconnecting.Set(string(addr.ID), addr)
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defer sw.reconnecting.Delete(string(addr.ID))
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start := time.Now()
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sw.Logger.Info("Reconnecting to peer", "addr", addr)
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for i := 0; i < reconnectAttempts; i++ {
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if !sw.IsRunning() {
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return
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}
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err := sw.DialPeerWithAddress(addr)
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if err == nil {
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return // success
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} else if _, ok := err.(ErrCurrentlyDialingOrExistingAddress); ok {
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return
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}
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sw.Logger.Info("Error reconnecting to peer. Trying again", "tries", i, "err", err, "addr", addr)
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// sleep a set amount
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sw.randomSleep(reconnectInterval)
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continue
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}
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sw.Logger.Error("Failed to reconnect to peer. Beginning exponential backoff",
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"addr", addr, "elapsed", time.Since(start))
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for i := 0; i < reconnectBackOffAttempts; i++ {
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if !sw.IsRunning() {
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return
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}
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|
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// sleep an exponentially increasing amount
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sleepIntervalSeconds := math.Pow(reconnectBackOffBaseSeconds, float64(i))
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sw.randomSleep(time.Duration(sleepIntervalSeconds) * time.Second)
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|
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err := sw.DialPeerWithAddress(addr)
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if err == nil {
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return // success
|
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} else if _, ok := err.(ErrCurrentlyDialingOrExistingAddress); ok {
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return
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}
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sw.Logger.Info("Error reconnecting to peer. Trying again", "tries", i, "err", err, "addr", addr)
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}
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sw.Logger.Error("Failed to reconnect to peer. Giving up", "addr", addr, "elapsed", time.Since(start))
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}
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|
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// SetAddrBook allows to set address book on Switch.
|
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func (sw *Switch) SetAddrBook(addrBook AddrBook) {
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sw.addrBook = addrBook
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}
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|
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// MarkPeerAsGood marks the given peer as good when it did something useful
|
|
// like contributed to consensus.
|
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func (sw *Switch) MarkPeerAsGood(peer Peer) {
|
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if sw.addrBook != nil {
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sw.addrBook.MarkGood(peer.ID())
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}
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}
|
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|
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//---------------------------------------------------------------------
|
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// Dialing
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|
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type privateAddr interface {
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PrivateAddr() bool
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}
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|
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func isPrivateAddr(err error) bool {
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te, ok := err.(privateAddr)
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return ok && te.PrivateAddr()
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}
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|
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// DialPeersAsync dials a list of peers asynchronously in random order.
|
|
// Used to dial peers from config on startup or from unsafe-RPC (trusted sources).
|
|
// It ignores ErrNetAddressLookup. However, if there are other errors, first
|
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// encounter is returned.
|
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// Nop if there are no peers.
|
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func (sw *Switch) DialPeersAsync(peers []string) error {
|
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netAddrs, errs := NewNetAddressStrings(peers)
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// report all the errors
|
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for _, err := range errs {
|
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sw.Logger.Error("Error in peer's address", "err", err)
|
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}
|
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// return first non-ErrNetAddressLookup error
|
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for _, err := range errs {
|
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if _, ok := err.(ErrNetAddressLookup); ok {
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continue
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}
|
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return err
|
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}
|
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sw.dialPeersAsync(netAddrs)
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return nil
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}
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|
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func (sw *Switch) dialPeersAsync(netAddrs []*NetAddress) {
|
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ourAddr := sw.NetAddress()
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|
|
// TODO: this code feels like it's in the wrong place.
|
|
// The integration tests depend on the addrBook being saved
|
|
// right away but maybe we can change that. Recall that
|
|
// the addrBook is only written to disk every 2min
|
|
if sw.addrBook != nil {
|
|
// add peers to `addrBook`
|
|
for _, netAddr := range netAddrs {
|
|
// do not add our address or ID
|
|
if !netAddr.Same(ourAddr) {
|
|
if err := sw.addrBook.AddAddress(netAddr, ourAddr); err != nil {
|
|
if isPrivateAddr(err) {
|
|
sw.Logger.Debug("Won't add peer's address to addrbook", "err", err)
|
|
} else {
|
|
sw.Logger.Error("Can't add peer's address to addrbook", "err", err)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// Persist some peers to disk right away.
|
|
// NOTE: integration tests depend on this
|
|
sw.addrBook.Save()
|
|
}
|
|
|
|
// permute the list, dial them in random order.
|
|
perm := sw.rng.Perm(len(netAddrs))
|
|
for i := 0; i < len(perm); i++ {
|
|
go func(i int) {
|
|
j := perm[i]
|
|
addr := netAddrs[j]
|
|
|
|
if addr.Same(ourAddr) {
|
|
sw.Logger.Debug("Ignore attempt to connect to ourselves", "addr", addr, "ourAddr", ourAddr)
|
|
return
|
|
}
|
|
|
|
sw.randomSleep(0)
|
|
|
|
err := sw.DialPeerWithAddress(addr)
|
|
if err != nil {
|
|
switch err.(type) {
|
|
case ErrSwitchConnectToSelf, ErrSwitchDuplicatePeerID, ErrCurrentlyDialingOrExistingAddress:
|
|
sw.Logger.Debug("Error dialing peer", "err", err)
|
|
default:
|
|
sw.Logger.Error("Error dialing peer", "err", err)
|
|
}
|
|
}
|
|
}(i)
|
|
}
|
|
}
|
|
|
|
// DialPeerWithAddress dials the given peer and runs sw.addPeer if it connects
|
|
// and authenticates successfully.
|
|
// If we're currently dialing this address or it belongs to an existing peer,
|
|
// ErrCurrentlyDialingOrExistingAddress is returned.
|
|
func (sw *Switch) DialPeerWithAddress(addr *NetAddress) error {
|
|
if sw.IsDialingOrExistingAddress(addr) {
|
|
return ErrCurrentlyDialingOrExistingAddress{addr.String()}
|
|
}
|
|
|
|
sw.dialing.Set(string(addr.ID), addr)
|
|
defer sw.dialing.Delete(string(addr.ID))
|
|
|
|
return sw.addOutboundPeerWithConfig(addr, sw.config)
|
|
}
|
|
|
|
// sleep for interval plus some random amount of ms on [0, dialRandomizerIntervalMilliseconds]
|
|
func (sw *Switch) randomSleep(interval time.Duration) {
|
|
r := time.Duration(sw.rng.Int63n(dialRandomizerIntervalMilliseconds)) * time.Millisecond
|
|
time.Sleep(r + interval)
|
|
}
|
|
|
|
// IsDialingOrExistingAddress returns true if switch has a peer with the given
|
|
// address or dialing it at the moment.
|
|
func (sw *Switch) IsDialingOrExistingAddress(addr *NetAddress) bool {
|
|
return sw.dialing.Has(string(addr.ID)) ||
|
|
sw.peers.Has(addr.ID) ||
|
|
(!sw.config.AllowDuplicateIP && sw.peers.HasIP(addr.IP))
|
|
}
|
|
|
|
// AddPersistentPeers allows you to set persistent peers. It ignores
|
|
// ErrNetAddressLookup. However, if there are other errors, first encounter is
|
|
// returned.
|
|
func (sw *Switch) AddPersistentPeers(addrs []string) error {
|
|
sw.Logger.Info("Adding persistent peers", "addrs", addrs)
|
|
netAddrs, errs := NewNetAddressStrings(addrs)
|
|
// report all the errors
|
|
for _, err := range errs {
|
|
sw.Logger.Error("Error in peer's address", "err", err)
|
|
}
|
|
// return first non-ErrNetAddressLookup error
|
|
for _, err := range errs {
|
|
if _, ok := err.(ErrNetAddressLookup); ok {
|
|
continue
|
|
}
|
|
return err
|
|
}
|
|
sw.persistentPeersAddrs = netAddrs
|
|
return nil
|
|
}
|
|
|
|
func (sw *Switch) AddUnconditionalPeerIDs(ids []string) error {
|
|
sw.Logger.Info("Adding unconditional peer ids", "ids", ids)
|
|
for i, id := range ids {
|
|
err := NodeID(id).Validate()
|
|
if err != nil {
|
|
return fmt.Errorf("wrong ID #%d: %w", i, err)
|
|
}
|
|
sw.unconditionalPeerIDs[NodeID(id)] = struct{}{}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (sw *Switch) AddPrivatePeerIDs(ids []string) error {
|
|
validIDs := make([]string, 0, len(ids))
|
|
for i, id := range ids {
|
|
err := NodeID(id).Validate()
|
|
if err != nil {
|
|
return fmt.Errorf("wrong ID #%d: %w", i, err)
|
|
}
|
|
validIDs = append(validIDs, id)
|
|
}
|
|
|
|
sw.addrBook.AddPrivateIDs(validIDs)
|
|
|
|
return nil
|
|
}
|
|
|
|
func (sw *Switch) IsPeerPersistent(na *NetAddress) bool {
|
|
for _, pa := range sw.persistentPeersAddrs {
|
|
if pa.Equals(na) {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (sw *Switch) acceptRoutine() {
|
|
for {
|
|
var peerNodeInfo NodeInfo
|
|
c, err := sw.transport.Accept()
|
|
if err == nil {
|
|
// NOTE: The legacy MConn transport did handshaking in Accept(),
|
|
// which was asynchronous and avoided head-of-line-blocking.
|
|
// However, as handshakes are being migrated out from the transport,
|
|
// we just do it synchronously here for now.
|
|
peerNodeInfo, _, err = sw.handshakePeer(c, "")
|
|
}
|
|
if err == nil {
|
|
err = sw.filterConn(c.(*mConnConnection).conn)
|
|
}
|
|
if err != nil {
|
|
if c != nil {
|
|
_ = c.Close()
|
|
}
|
|
if err == io.EOF {
|
|
err = ErrTransportClosed{}
|
|
}
|
|
switch err := err.(type) {
|
|
case ErrRejected:
|
|
if err.IsSelf() {
|
|
// Remove the given address from the address book and add to our addresses
|
|
// to avoid dialing in the future.
|
|
addr := err.Addr()
|
|
sw.addrBook.RemoveAddress(&addr)
|
|
sw.addrBook.AddOurAddress(&addr)
|
|
}
|
|
|
|
sw.Logger.Info(
|
|
"Inbound Peer rejected",
|
|
"err", err,
|
|
"numPeers", sw.peers.Size(),
|
|
)
|
|
|
|
continue
|
|
case ErrFilterTimeout:
|
|
sw.Logger.Error(
|
|
"Peer filter timed out",
|
|
"err", err,
|
|
)
|
|
|
|
continue
|
|
case ErrTransportClosed:
|
|
sw.Logger.Error(
|
|
"Stopped accept routine, as transport is closed",
|
|
"numPeers", sw.peers.Size(),
|
|
)
|
|
default:
|
|
sw.Logger.Error(
|
|
"Accept on transport errored",
|
|
"err", err,
|
|
"numPeers", sw.peers.Size(),
|
|
)
|
|
// We could instead have a retry loop around the acceptRoutine,
|
|
// but that would need to stop and let the node shutdown eventually.
|
|
// So might as well panic and let process managers restart the node.
|
|
// There's no point in letting the node run without the acceptRoutine,
|
|
// since it won't be able to accept new connections.
|
|
panic(fmt.Errorf("accept routine exited: %v", err))
|
|
}
|
|
|
|
break
|
|
}
|
|
|
|
isPersistent := false
|
|
addr, err := peerNodeInfo.NetAddress()
|
|
if err == nil {
|
|
isPersistent = sw.IsPeerPersistent(addr)
|
|
}
|
|
|
|
p := newPeer(
|
|
peerNodeInfo,
|
|
newPeerConn(false, isPersistent, c),
|
|
sw.reactorsByCh,
|
|
sw.StopPeerForError,
|
|
PeerMetrics(sw.metrics),
|
|
)
|
|
|
|
if !sw.IsPeerUnconditional(p.NodeInfo().ID()) {
|
|
// Ignore connection if we already have enough peers.
|
|
_, in, _ := sw.NumPeers()
|
|
if in >= sw.config.MaxNumInboundPeers {
|
|
sw.Logger.Info(
|
|
"Ignoring inbound connection: already have enough inbound peers",
|
|
"address", p.SocketAddr(),
|
|
"have", in,
|
|
"max", sw.config.MaxNumInboundPeers,
|
|
)
|
|
_ = p.CloseConn()
|
|
continue
|
|
}
|
|
|
|
}
|
|
|
|
if err := sw.addPeer(p); err != nil {
|
|
_ = p.CloseConn()
|
|
if p.IsRunning() {
|
|
_ = p.Stop()
|
|
}
|
|
sw.conns.RemoveAddr(p.RemoteAddr())
|
|
sw.Logger.Info(
|
|
"Ignoring inbound connection: error while adding peer",
|
|
"err", err,
|
|
"id", p.ID(),
|
|
)
|
|
}
|
|
}
|
|
}
|
|
|
|
// dial the peer; make secret connection; authenticate against the dialed ID;
|
|
// add the peer.
|
|
// if dialing fails, start the reconnect loop. If handshake fails, it's over.
|
|
// If peer is started successfully, reconnectLoop will start when
|
|
// StopPeerForError is called.
|
|
func (sw *Switch) addOutboundPeerWithConfig(
|
|
addr *NetAddress,
|
|
cfg *config.P2PConfig,
|
|
) error {
|
|
sw.Logger.Info("Dialing peer", "address", addr)
|
|
|
|
// XXX(xla): Remove the leakage of test concerns in implementation.
|
|
if cfg.TestDialFail {
|
|
go sw.reconnectToPeer(addr)
|
|
return fmt.Errorf("dial err (peerConfig.DialFail == true)")
|
|
}
|
|
|
|
// Hardcoded timeout moved from MConn transport during refactoring.
|
|
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
|
|
defer cancel()
|
|
|
|
var peerNodeInfo NodeInfo
|
|
c, err := sw.transport.Dial(ctx, Endpoint{
|
|
Protocol: MConnProtocol,
|
|
IP: addr.IP,
|
|
Port: addr.Port,
|
|
})
|
|
if err == nil {
|
|
peerNodeInfo, _, err = sw.handshakePeer(c, addr.ID)
|
|
}
|
|
if err == nil {
|
|
err = sw.filterConn(c.(*mConnConnection).conn)
|
|
}
|
|
if err != nil {
|
|
if c != nil {
|
|
_ = c.Close()
|
|
}
|
|
if e, ok := err.(ErrRejected); ok {
|
|
if e.IsSelf() {
|
|
// Remove the given address from the address book and add to our addresses
|
|
// to avoid dialing in the future.
|
|
sw.addrBook.RemoveAddress(addr)
|
|
sw.addrBook.AddOurAddress(addr)
|
|
|
|
return err
|
|
}
|
|
}
|
|
|
|
// retry persistent peers after
|
|
// any dial error besides IsSelf()
|
|
if sw.IsPeerPersistent(addr) {
|
|
go sw.reconnectToPeer(addr)
|
|
}
|
|
|
|
return err
|
|
}
|
|
|
|
p := newPeer(
|
|
peerNodeInfo,
|
|
newPeerConn(true, sw.IsPeerPersistent(addr), c),
|
|
sw.reactorsByCh,
|
|
sw.StopPeerForError,
|
|
PeerMetrics(sw.metrics),
|
|
)
|
|
|
|
if err := sw.addPeer(p); err != nil {
|
|
_ = p.CloseConn()
|
|
if p.IsRunning() {
|
|
_ = p.Stop()
|
|
}
|
|
sw.conns.RemoveAddr(p.RemoteAddr())
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (sw *Switch) handshakePeer(c Connection, expectPeerID NodeID) (NodeInfo, crypto.PubKey, error) {
|
|
// Moved from transport and hardcoded until legacy P2P stack removal.
|
|
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
|
|
defer cancel()
|
|
|
|
peerInfo, peerKey, err := c.Handshake(ctx, sw.nodeInfo, sw.nodeKey.PrivKey)
|
|
if err != nil {
|
|
return peerInfo, peerKey, ErrRejected{
|
|
conn: c.(*mConnConnection).conn,
|
|
err: fmt.Errorf("handshake failed: %v", err),
|
|
isAuthFailure: true,
|
|
}
|
|
}
|
|
|
|
if err = peerInfo.Validate(); err != nil {
|
|
return peerInfo, peerKey, ErrRejected{
|
|
conn: c.(*mConnConnection).conn,
|
|
err: err,
|
|
isNodeInfoInvalid: true,
|
|
}
|
|
}
|
|
|
|
// For outgoing conns, ensure connection key matches dialed key.
|
|
if expectPeerID != "" {
|
|
peerID := NodeIDFromPubKey(peerKey)
|
|
if expectPeerID != peerID {
|
|
return peerInfo, peerKey, ErrRejected{
|
|
conn: c.(*mConnConnection).conn,
|
|
id: peerID,
|
|
err: fmt.Errorf(
|
|
"conn.ID (%v) dialed ID (%v) mismatch",
|
|
peerID,
|
|
expectPeerID,
|
|
),
|
|
isAuthFailure: true,
|
|
}
|
|
}
|
|
}
|
|
|
|
if sw.nodeInfo.ID() == peerInfo.ID() {
|
|
return peerInfo, peerKey, ErrRejected{
|
|
addr: *NewNetAddress(peerInfo.ID(), c.(*mConnConnection).conn.RemoteAddr()),
|
|
conn: c.(*mConnConnection).conn,
|
|
id: peerInfo.ID(),
|
|
isSelf: true,
|
|
}
|
|
}
|
|
|
|
if err = sw.nodeInfo.CompatibleWith(peerInfo); err != nil {
|
|
return peerInfo, peerKey, ErrRejected{
|
|
conn: c.(*mConnConnection).conn,
|
|
err: err,
|
|
id: peerInfo.ID(),
|
|
isIncompatible: true,
|
|
}
|
|
}
|
|
|
|
return peerInfo, peerKey, nil
|
|
}
|
|
|
|
func (sw *Switch) filterPeer(p Peer) error {
|
|
// Avoid duplicate
|
|
if sw.peers.Has(p.ID()) {
|
|
return ErrRejected{id: p.ID(), isDuplicate: true}
|
|
}
|
|
|
|
errc := make(chan error, len(sw.peerFilters))
|
|
|
|
for _, f := range sw.peerFilters {
|
|
go func(f PeerFilterFunc, p Peer, errc chan<- error) {
|
|
errc <- f(sw.peers, p)
|
|
}(f, p, errc)
|
|
}
|
|
|
|
for i := 0; i < cap(errc); i++ {
|
|
select {
|
|
case err := <-errc:
|
|
if err != nil {
|
|
return ErrRejected{id: p.ID(), err: err, isFiltered: true}
|
|
}
|
|
case <-time.After(sw.filterTimeout):
|
|
return ErrFilterTimeout{}
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// filterConn filters a connection, rejecting it if this function errors.
|
|
//
|
|
// FIXME: This is only here for compatibility with the current Switch code. In
|
|
// the new P2P stack, peer/connection filtering should be moved into the Router
|
|
// or PeerManager and removed from here.
|
|
func (sw *Switch) filterConn(conn net.Conn) error {
|
|
if sw.conns.Has(conn) {
|
|
return ErrRejected{conn: conn, isDuplicate: true}
|
|
}
|
|
|
|
host, _, err := net.SplitHostPort(conn.RemoteAddr().String())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
ip := net.ParseIP(host)
|
|
if ip == nil {
|
|
return fmt.Errorf("connection address has invalid IP address %q", host)
|
|
}
|
|
|
|
// Apply filter callbacks.
|
|
chErr := make(chan error, len(sw.connFilters))
|
|
for _, connFilter := range sw.connFilters {
|
|
go func(connFilter ConnFilterFunc) {
|
|
chErr <- connFilter(sw.conns, conn, []net.IP{ip})
|
|
}(connFilter)
|
|
}
|
|
|
|
for i := 0; i < cap(chErr); i++ {
|
|
select {
|
|
case err := <-chErr:
|
|
if err != nil {
|
|
return ErrRejected{conn: conn, err: err, isFiltered: true}
|
|
}
|
|
case <-time.After(sw.filterTimeout):
|
|
return ErrFilterTimeout{}
|
|
}
|
|
|
|
}
|
|
|
|
// FIXME: Doesn't really make sense to set this here, but we preserve the
|
|
// behavior from the previous P2P transport implementation.
|
|
sw.conns.Set(conn, []net.IP{ip})
|
|
return nil
|
|
}
|
|
|
|
// addPeer starts up the Peer and adds it to the Switch. Error is returned if
|
|
// the peer is filtered out or failed to start or can't be added.
|
|
func (sw *Switch) addPeer(p Peer) error {
|
|
if err := sw.filterPeer(p); err != nil {
|
|
return err
|
|
}
|
|
|
|
p.SetLogger(sw.Logger.With("peer", p.SocketAddr()))
|
|
|
|
// Handle the shut down case where the switch has stopped but we're
|
|
// concurrently trying to add a peer.
|
|
if !sw.IsRunning() {
|
|
// XXX should this return an error or just log and terminate?
|
|
sw.Logger.Error("Won't start a peer - switch is not running", "peer", p)
|
|
return nil
|
|
}
|
|
|
|
// Add some data to the peer, which is required by reactors.
|
|
for _, reactor := range sw.reactors {
|
|
p = reactor.InitPeer(p)
|
|
}
|
|
|
|
// Start the peer's send/recv routines.
|
|
// Must start it before adding it to the peer set
|
|
// to prevent Start and Stop from being called concurrently.
|
|
err := p.Start()
|
|
if err != nil {
|
|
// Should never happen
|
|
sw.Logger.Error("Error starting peer", "err", err, "peer", p)
|
|
return err
|
|
}
|
|
|
|
// Add the peer to PeerSet. Do this before starting the reactors
|
|
// so that if Receive errors, we will find the peer and remove it.
|
|
// Add should not err since we already checked peers.Has().
|
|
if err := sw.peers.Add(p); err != nil {
|
|
return err
|
|
}
|
|
sw.metrics.Peers.Add(float64(1))
|
|
|
|
// Start all the reactor protocols on the peer.
|
|
for _, reactor := range sw.reactors {
|
|
reactor.AddPeer(p)
|
|
}
|
|
|
|
sw.Logger.Info("Added peer", "peer", p)
|
|
|
|
return nil
|
|
}
|