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p2p: new dial scheduler (#20592)

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* p2p: new dial scheduler

This change replaces the peer-to-peer dial scheduler with a new and
improved implementation. The new code is better than the previous
implementation in two key aspects:

- The time between discovery of a node and dialing that node is
  significantly lower in the new version. The old dialState kept
  a buffer of nodes and launched a task to refill it whenever the buffer
  became empty. This worked well with the discovery interface we used to
  have, but doesn't really work with the new iterator-based discovery
  API.

- Selection of static dial candidates (created by Server.AddPeer or
  through static-nodes.json) performs much better for large amounts of
  static peers. Connections to static nodes are now limited like dynanic
  dials and can no longer overstep MaxPeers or the dial ratio.

* p2p/simulations/adapters: adapt to new NodeDialer interface

* p2p: re-add check for self in checkDial

* p2p: remove peersetCh

* p2p: allow static dials when discovery is disabled

* p2p: add test for dialScheduler.removeStatic

* p2p: remove blank line

* p2p: fix documentation of maxDialPeers

* p2p: change "ok" to "added" in static node log

* p2p: improve dialTask docs

Also increase log level for "Can't resolve node"

* p2p: ensure dial resolver is truly nil without discovery

* p2p: add "looking for peers" log message

* p2p: clean up Server.run comments

* p2p: fix maxDialedConns for maxpeers < dialRatio

Always allocate at least one dial slot unless dialing is disabled using
NoDial or MaxPeers == 0. Most importantly, this fixes MaxPeers == 1 to
dedicate the sole slot to dialing instead of listening.

* p2p: fix RemovePeer to disconnect the peer again

Also make RemovePeer synchronous and add a test.

* p2p: remove "Connection set up" log message

* p2p: clean up connection logging

We previously logged outgoing connection failures up to three times.

- in SetupConn() as "Setting up connection failed addr=..."
- in setupConn() with an error-specific message and "id=... addr=..."
- in dial() as "Dial error task=..."

This commit ensures a single log message is emitted per failure and adds
"id=... addr=... conn=..." everywhere (id= omitted when the ID isn't
known yet).

Also avoid printing a log message when a static dial fails but can't be
resolved because discv4 is disabled. The light client hit this case all
the time, increasing the message count to four lines per failed
connection.

* p2p: document that RemovePeer blocks
This commit is contained in:
Felix Lange 2020-02-13 11:10:03 +01:00 committed by GitHub
parent 5f2002bbcc
commit 90caa2cabb
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
8 changed files with 1267 additions and 1071 deletions
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637
p2p/dial.go
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@ -17,11 +17,17 @@
package p2p package p2p
import ( import (
"context"
crand "crypto/rand"
"encoding/binary"
"errors" "errors"
"fmt" "fmt"
mrand "math/rand"
"net" "net"
"sync"
"time" "time"
"github.com/ethereum/go-ethereum/common/mclock"
"github.com/ethereum/go-ethereum/log" "github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/p2p/enode" "github.com/ethereum/go-ethereum/p2p/enode"
"github.com/ethereum/go-ethereum/p2p/netutil" "github.com/ethereum/go-ethereum/p2p/netutil"
@ -33,8 +39,9 @@ const (
// private networks. // private networks.
dialHistoryExpiration = inboundThrottleTime + 5*time.Second dialHistoryExpiration = inboundThrottleTime + 5*time.Second
// If no peers are found for this amount of time, the initial bootnodes are dialed. // Config for the "Looking for peers" message.
fallbackInterval = 20 * time.Second dialStatsLogInterval = 10 * time.Second // printed at most this often
dialStatsPeerLimit = 3 // but not if more than this many dialed peers
// Endpoint resolution is throttled with bounded backoff. // Endpoint resolution is throttled with bounded backoff.
initialResolveDelay = 60 * time.Second initialResolveDelay = 60 * time.Second
@ -42,161 +49,29 @@ const (
) )
// NodeDialer is used to connect to nodes in the network, typically by using // NodeDialer is used to connect to nodes in the network, typically by using
// an underlying net.Dialer but also using net.Pipe in tests // an underlying net.Dialer but also using net.Pipe in tests.
type NodeDialer interface { type NodeDialer interface {
Dial(*enode.Node) (net.Conn, error) Dial(context.Context, *enode.Node) (net.Conn, error)
} }
type nodeResolver interface { type nodeResolver interface {
Resolve(*enode.Node) *enode.Node Resolve(*enode.Node) *enode.Node
} }
// TCPDialer implements the NodeDialer interface by using a net.Dialer to // tcpDialer implements NodeDialer using real TCP connections.
// create TCP connections to nodes in the network type tcpDialer struct {
type TCPDialer struct { d *net.Dialer
*net.Dialer
} }
// Dial creates a TCP connection to the node func (t tcpDialer) Dial(ctx context.Context, dest *enode.Node) (net.Conn, error) {
func (t TCPDialer) Dial(dest *enode.Node) (net.Conn, error) { return t.d.DialContext(ctx, "tcp", nodeAddr(dest).String())
addr := &net.TCPAddr{IP: dest.IP(), Port: dest.TCP()}
return t.Dialer.Dial("tcp", addr.String())
} }
// dialstate schedules dials and discovery lookups. func nodeAddr(n *enode.Node) net.Addr {
// It gets a chance to compute new tasks on every iteration return &net.TCPAddr{IP: n.IP(), Port: n.TCP()}
// of the main loop in Server.run.
type dialstate struct {
maxDynDials int
netrestrict *netutil.Netlist
self enode.ID
bootnodes []*enode.Node // default dials when there are no peers
log log.Logger
start time.Time // time when the dialer was first used
lookupRunning bool
dialing map[enode.ID]connFlag
lookupBuf []*enode.Node // current discovery lookup results
static map[enode.ID]*dialTask
hist expHeap
}
type task interface {
Do(*Server)
}
func newDialState(self enode.ID, maxdyn int, cfg *Config) *dialstate {
s := &dialstate{
maxDynDials: maxdyn,
self: self,
netrestrict: cfg.NetRestrict,
log: cfg.Logger,
static: make(map[enode.ID]*dialTask),
dialing: make(map[enode.ID]connFlag),
bootnodes: make([]*enode.Node, len(cfg.BootstrapNodes)),
}
copy(s.bootnodes, cfg.BootstrapNodes)
if s.log == nil {
s.log = log.Root()
}
for _, n := range cfg.StaticNodes {
s.addStatic(n)
}
return s
}
func (s *dialstate) addStatic(n *enode.Node) {
// This overwrites the task instead of updating an existing
// entry, giving users the opportunity to force a resolve operation.
s.static[n.ID()] = &dialTask{flags: staticDialedConn, dest: n}
}
func (s *dialstate) removeStatic(n *enode.Node) {
// This removes a task so future attempts to connect will not be made.
delete(s.static, n.ID())
}
func (s *dialstate) newTasks(nRunning int, peers map[enode.ID]*Peer, now time.Time) []task {
var newtasks []task
addDial := func(flag connFlag, n *enode.Node) bool {
if err := s.checkDial(n, peers); err != nil {
s.log.Trace("Skipping dial candidate", "id", n.ID(), "addr", &net.TCPAddr{IP: n.IP(), Port: n.TCP()}, "err", err)
return false
}
s.dialing[n.ID()] = flag
newtasks = append(newtasks, &dialTask{flags: flag, dest: n})
return true
}
if s.start.IsZero() {
s.start = now
}
s.hist.expire(now)
// Create dials for static nodes if they are not connected.
for id, t := range s.static {
err := s.checkDial(t.dest, peers)
switch err {
case errNotWhitelisted, errSelf:
s.log.Warn("Removing static dial candidate", "id", t.dest.ID, "addr", &net.TCPAddr{IP: t.dest.IP(), Port: t.dest.TCP()}, "err", err)
delete(s.static, t.dest.ID())
case nil:
s.dialing[id] = t.flags
newtasks = append(newtasks, t)
}
}
// Compute number of dynamic dials needed.
needDynDials := s.maxDynDials
for _, p := range peers {
if p.rw.is(dynDialedConn) {
needDynDials--
}
}
for _, flag := range s.dialing {
if flag&dynDialedConn != 0 {
needDynDials--
}
}
// If we don't have any peers whatsoever, try to dial a random bootnode. This
// scenario is useful for the testnet (and private networks) where the discovery
// table might be full of mostly bad peers, making it hard to find good ones.
if len(peers) == 0 && len(s.bootnodes) > 0 && needDynDials > 0 && now.Sub(s.start) > fallbackInterval {
bootnode := s.bootnodes[0]
s.bootnodes = append(s.bootnodes[:0], s.bootnodes[1:]...)
s.bootnodes = append(s.bootnodes, bootnode)
if addDial(dynDialedConn, bootnode) {
needDynDials--
}
}
// Create dynamic dials from discovery results.
i := 0
for ; i < len(s.lookupBuf) && needDynDials > 0; i++ {
if addDial(dynDialedConn, s.lookupBuf[i]) {
needDynDials--
}
}
s.lookupBuf = s.lookupBuf[:copy(s.lookupBuf, s.lookupBuf[i:])]
// Launch a discovery lookup if more candidates are needed.
if len(s.lookupBuf) < needDynDials && !s.lookupRunning {
s.lookupRunning = true
newtasks = append(newtasks, &discoverTask{want: needDynDials - len(s.lookupBuf)})
}
// Launch a timer to wait for the next node to expire if all
// candidates have been tried and no task is currently active.
// This should prevent cases where the dialer logic is not ticked
// because there are no pending events.
if nRunning == 0 && len(newtasks) == 0 && s.hist.Len() > 0 {
t := &waitExpireTask{s.hist.nextExpiry().Sub(now)}
newtasks = append(newtasks, t)
}
return newtasks
} }
// checkDial errors:
var ( var (
errSelf = errors.New("is self") errSelf = errors.New("is self")
errAlreadyDialing = errors.New("already dialing") errAlreadyDialing = errors.New("already dialing")
@ -205,56 +80,412 @@ var (
errNotWhitelisted = errors.New("not contained in netrestrict whitelist") errNotWhitelisted = errors.New("not contained in netrestrict whitelist")
) )
func (s *dialstate) checkDial(n *enode.Node, peers map[enode.ID]*Peer) error { // dialer creates outbound connections and submits them into Server.
_, dialing := s.dialing[n.ID()] // Two types of peer connections can be created:
switch { //
case dialing: // - static dials are pre-configured connections. The dialer attempts
return errAlreadyDialing // keep these nodes connected at all times.
case peers[n.ID()] != nil: //
return errAlreadyConnected // - dynamic dials are created from node discovery results. The dialer
case n.ID() == s.self: // continuously reads candidate nodes from its input iterator and attempts
// to create peer connections to nodes arriving through the iterator.
//
type dialScheduler struct {
dialConfig
setupFunc dialSetupFunc
wg sync.WaitGroup
cancel context.CancelFunc
ctx context.Context
nodesIn chan *enode.Node
doneCh chan *dialTask
addStaticCh chan *enode.Node
remStaticCh chan *enode.Node
addPeerCh chan *conn
remPeerCh chan *conn
// Everything below here belongs to loop and
// should only be accessed by code on the loop goroutine.
dialing map[enode.ID]*dialTask // active tasks
peers map[enode.ID]connFlag // all connected peers
dialPeers int // current number of dialed peers
// The static map tracks all static dial tasks. The subset of usable static dial tasks
// (i.e. those passing checkDial) is kept in staticPool. The scheduler prefers
// launching random static tasks from the pool over launching dynamic dials from the
// iterator.
static map[enode.ID]*dialTask
staticPool []*dialTask
// The dial history keeps recently dialed nodes. Members of history are not dialed.
history expHeap
historyTimer mclock.Timer
historyTimerTime mclock.AbsTime
// for logStats
lastStatsLog mclock.AbsTime
doneSinceLastLog int
}
type dialSetupFunc func(net.Conn, connFlag, *enode.Node) error
type dialConfig struct {
self enode.ID // our own ID
maxDialPeers int // maximum number of dialed peers
maxActiveDials int // maximum number of active dials
netRestrict *netutil.Netlist // IP whitelist, disabled if nil
resolver nodeResolver
dialer NodeDialer
log log.Logger
clock mclock.Clock
rand *mrand.Rand
}
func (cfg dialConfig) withDefaults() dialConfig {
if cfg.maxActiveDials == 0 {
cfg.maxActiveDials = defaultMaxPendingPeers
}
if cfg.log == nil {
cfg.log = log.Root()
}
if cfg.clock == nil {
cfg.clock = mclock.System{}
}
if cfg.rand == nil {
seedb := make([]byte, 8)
crand.Read(seedb)
seed := int64(binary.BigEndian.Uint64(seedb))
cfg.rand = mrand.New(mrand.NewSource(seed))
}
return cfg
}
func newDialScheduler(config dialConfig, it enode.Iterator, setupFunc dialSetupFunc) *dialScheduler {
d := &dialScheduler{
dialConfig: config.withDefaults(),
setupFunc: setupFunc,
dialing: make(map[enode.ID]*dialTask),
static: make(map[enode.ID]*dialTask),
peers: make(map[enode.ID]connFlag),
doneCh: make(chan *dialTask),
nodesIn: make(chan *enode.Node),
addStaticCh: make(chan *enode.Node),
remStaticCh: make(chan *enode.Node),
addPeerCh: make(chan *conn),
remPeerCh: make(chan *conn),
}
d.lastStatsLog = d.clock.Now()
d.ctx, d.cancel = context.WithCancel(context.Background())
d.wg.Add(2)
go d.readNodes(it)
go d.loop(it)
return d
}
// stop shuts down the dialer, canceling all current dial tasks.
func (d *dialScheduler) stop() {
d.cancel()
d.wg.Wait()
}
// addStatic adds a static dial candidate.
func (d *dialScheduler) addStatic(n *enode.Node) {
select {
case d.addStaticCh <- n:
case <-d.ctx.Done():
}
}
// removeStatic removes a static dial candidate.
func (d *dialScheduler) removeStatic(n *enode.Node) {
select {
case d.remStaticCh <- n:
case <-d.ctx.Done():
}
}
// peerAdded updates the peer set.
func (d *dialScheduler) peerAdded(c *conn) {
select {
case d.addPeerCh <- c:
case <-d.ctx.Done():
}
}
// peerRemoved updates the peer set.
func (d *dialScheduler) peerRemoved(c *conn) {
select {
case d.remPeerCh <- c:
case <-d.ctx.Done():
}
}
// loop is the main loop of the dialer.
func (d *dialScheduler) loop(it enode.Iterator) {
var (
nodesCh chan *enode.Node
historyExp = make(chan struct{}, 1)
)
loop:
for {
// Launch new dials if slots are available.
slots := d.freeDialSlots()
slots -= d.startStaticDials(slots)
if slots > 0 {
nodesCh = d.nodesIn
} else {
nodesCh = nil
}
d.rearmHistoryTimer(historyExp)
d.logStats()
select {
case node := <-nodesCh:
if err := d.checkDial(node); err != nil {
d.log.Trace("Discarding dial candidate", "id", node.ID(), "ip", node.IP(), "reason", err)
} else {
d.startDial(newDialTask(node, dynDialedConn))
}
case task := <-d.doneCh:
id := task.dest.ID()
delete(d.dialing, id)
d.updateStaticPool(id)
d.doneSinceLastLog++
case c := <-d.addPeerCh:
if c.is(dynDialedConn) || c.is(staticDialedConn) {
d.dialPeers++
}
id := c.node.ID()
d.peers[id] = c.flags
// Remove from static pool because the node is now connected.
task := d.static[id]
if task != nil && task.staticPoolIndex >= 0 {
d.removeFromStaticPool(task.staticPoolIndex)
}
// TODO: cancel dials to connected peers
case c := <-d.remPeerCh:
if c.is(dynDialedConn) || c.is(staticDialedConn) {
d.dialPeers--
}
delete(d.peers, c.node.ID())
d.updateStaticPool(c.node.ID())
case node := <-d.addStaticCh:
id := node.ID()
_, exists := d.static[id]
d.log.Trace("Adding static node", "id", id, "ip", node.IP(), "added", !exists)
if exists {
continue loop
}
task := newDialTask(node, staticDialedConn)
d.static[id] = task
if d.checkDial(node) == nil {
d.addToStaticPool(task)
}
case node := <-d.remStaticCh:
id := node.ID()
task := d.static[id]
d.log.Trace("Removing static node", "id", id, "ok", task != nil)
if task != nil {
delete(d.static, id)
if task.staticPoolIndex >= 0 {
d.removeFromStaticPool(task.staticPoolIndex)
}
}
case <-historyExp:
d.expireHistory()
case <-d.ctx.Done():
it.Close()
break loop
}
}
d.stopHistoryTimer(historyExp)
for range d.dialing {
<-d.doneCh
}
d.wg.Done()
}
// readNodes runs in its own goroutine and delivers nodes from
// the input iterator to the nodesIn channel.
func (d *dialScheduler) readNodes(it enode.Iterator) {
defer d.wg.Done()
for it.Next() {
select {
case d.nodesIn <- it.Node():
case <-d.ctx.Done():
}
}
}
// logStats prints dialer statistics to the log. The message is suppressed when enough
// peers are connected because users should only see it while their client is starting up
// or comes back online.
func (d *dialScheduler) logStats() {
now := d.clock.Now()
if d.lastStatsLog.Add(dialStatsLogInterval) > now {
return
}
if d.dialPeers < dialStatsPeerLimit && d.dialPeers < d.maxDialPeers {
d.log.Info("Looking for peers", "peercount", len(d.peers), "tried", d.doneSinceLastLog, "static", len(d.static))
}
d.doneSinceLastLog = 0
d.lastStatsLog = now
}
// rearmHistoryTimer configures d.historyTimer to fire when the
// next item in d.history expires.
func (d *dialScheduler) rearmHistoryTimer(ch chan struct{}) {
if len(d.history) == 0 || d.historyTimerTime == d.history.nextExpiry() {
return
}
d.stopHistoryTimer(ch)
d.historyTimerTime = d.history.nextExpiry()
timeout := time.Duration(d.historyTimerTime - d.clock.Now())
d.historyTimer = d.clock.AfterFunc(timeout, func() { ch <- struct{}{} })
}
// stopHistoryTimer stops the timer and drains the channel it sends on.
func (d *dialScheduler) stopHistoryTimer(ch chan struct{}) {
if d.historyTimer != nil && !d.historyTimer.Stop() {
<-ch
}
}
// expireHistory removes expired items from d.history.
func (d *dialScheduler) expireHistory() {
d.historyTimer.Stop()
d.historyTimer = nil
d.historyTimerTime = 0
d.history.expire(d.clock.Now(), func(hkey string) {
var id enode.ID
copy(id[:], hkey)
d.updateStaticPool(id)
})
}
// freeDialSlots returns the number of free dial slots. The result can be negative
// when peers are connected while their task is still running.
func (d *dialScheduler) freeDialSlots() int {
slots := (d.maxDialPeers - d.dialPeers) * 2
if slots > d.maxActiveDials {
slots = d.maxActiveDials
}
free := slots - len(d.dialing)
return free
}
// checkDial returns an error if node n should not be dialed.
func (d *dialScheduler) checkDial(n *enode.Node) error {
if n.ID() == d.self {
return errSelf return errSelf
case s.netrestrict != nil && !s.netrestrict.Contains(n.IP()): }
if _, ok := d.dialing[n.ID()]; ok {
return errAlreadyDialing
}
if _, ok := d.peers[n.ID()]; ok {
return errAlreadyConnected
}
if d.netRestrict != nil && !d.netRestrict.Contains(n.IP()) {
return errNotWhitelisted return errNotWhitelisted
case s.hist.contains(string(n.ID().Bytes())): }
if d.history.contains(string(n.ID().Bytes())) {
return errRecentlyDialed return errRecentlyDialed
} }
return nil return nil
} }
func (s *dialstate) taskDone(t task, now time.Time) { // startStaticDials starts n static dial tasks.
switch t := t.(type) { func (d *dialScheduler) startStaticDials(n int) (started int) {
case *dialTask: for started = 0; started < n && len(d.staticPool) > 0; started++ {
s.hist.add(string(t.dest.ID().Bytes()), now.Add(dialHistoryExpiration)) idx := d.rand.Intn(len(d.staticPool))
delete(s.dialing, t.dest.ID()) task := d.staticPool[idx]
case *discoverTask: d.startDial(task)
s.lookupRunning = false d.removeFromStaticPool(idx)
s.lookupBuf = append(s.lookupBuf, t.results...) }
return started
}
// updateStaticPool attempts to move the given static dial back into staticPool.
func (d *dialScheduler) updateStaticPool(id enode.ID) {
task, ok := d.static[id]
if ok && task.staticPoolIndex < 0 && d.checkDial(task.dest) == nil {
d.addToStaticPool(task)
} }
} }
// A dialTask is generated for each node that is dialed. Its func (d *dialScheduler) addToStaticPool(task *dialTask) {
// fields cannot be accessed while the task is running. if task.staticPoolIndex >= 0 {
panic("attempt to add task to staticPool twice")
}
d.staticPool = append(d.staticPool, task)
task.staticPoolIndex = len(d.staticPool) - 1
}
// removeFromStaticPool removes the task at idx from staticPool. It does that by moving the
// current last element of the pool to idx and then shortening the pool by one.
func (d *dialScheduler) removeFromStaticPool(idx int) {
task := d.staticPool[idx]
end := len(d.staticPool) - 1
d.staticPool[idx] = d.staticPool[end]
d.staticPool[idx].staticPoolIndex = idx
d.staticPool[end] = nil
d.staticPool = d.staticPool[:end]
task.staticPoolIndex = -1
}
// startDial runs the given dial task in a separate goroutine.
func (d *dialScheduler) startDial(task *dialTask) {
d.log.Trace("Starting p2p dial", "id", task.dest.ID(), "ip", task.dest.IP(), "flag", task.flags)
hkey := string(task.dest.ID().Bytes())
d.history.add(hkey, d.clock.Now().Add(dialHistoryExpiration))
d.dialing[task.dest.ID()] = task
go func() {
task.run(d)
d.doneCh <- task
}()
}
// A dialTask generated for each node that is dialed.
type dialTask struct { type dialTask struct {
flags connFlag staticPoolIndex int
flags connFlag
// These fields are private to the task and should not be
// accessed by dialScheduler while the task is running.
dest *enode.Node dest *enode.Node
lastResolved time.Time lastResolved mclock.AbsTime
resolveDelay time.Duration resolveDelay time.Duration
} }
func (t *dialTask) Do(srv *Server) { func newDialTask(dest *enode.Node, flags connFlag) *dialTask {
return &dialTask{dest: dest, flags: flags, staticPoolIndex: -1}
}
type dialError struct {
error
}
func (t *dialTask) run(d *dialScheduler) {
if t.dest.Incomplete() { if t.dest.Incomplete() {
if !t.resolve(srv) { if !t.resolve(d) {
return return
} }
} }
err := t.dial(srv, t.dest)
err := t.dial(d, t.dest)
if err != nil { if err != nil {
srv.log.Trace("Dial error", "task", t, "err", err)
// Try resolving the ID of static nodes if dialing failed. // Try resolving the ID of static nodes if dialing failed.
if _, ok := err.(*dialError); ok && t.flags&staticDialedConn != 0 { if _, ok := err.(*dialError); ok && t.flags&staticDialedConn != 0 {
if t.resolve(srv) { if t.resolve(d) {
t.dial(srv, t.dest) t.dial(d, t.dest)
} }
} }
} }
@ -266,46 +497,42 @@ func (t *dialTask) Do(srv *Server) {
// Resolve operations are throttled with backoff to avoid flooding the // Resolve operations are throttled with backoff to avoid flooding the
// discovery network with useless queries for nodes that don't exist. // discovery network with useless queries for nodes that don't exist.
// The backoff delay resets when the node is found. // The backoff delay resets when the node is found.
func (t *dialTask) resolve(srv *Server) bool { func (t *dialTask) resolve(d *dialScheduler) bool {
if srv.staticNodeResolver == nil { if d.resolver == nil {
srv.log.Debug("Can't resolve node", "id", t.dest.ID(), "err", "discovery is disabled")
return false return false
} }
if t.resolveDelay == 0 { if t.resolveDelay == 0 {
t.resolveDelay = initialResolveDelay t.resolveDelay = initialResolveDelay
} }
if time.Since(t.lastResolved) < t.resolveDelay { if t.lastResolved > 0 && time.Duration(d.clock.Now()-t.lastResolved) < t.resolveDelay {
return false return false
} }
resolved := srv.staticNodeResolver.Resolve(t.dest) resolved := d.resolver.Resolve(t.dest)
t.lastResolved = time.Now() t.lastResolved = d.clock.Now()
if resolved == nil { if resolved == nil {
t.resolveDelay *= 2 t.resolveDelay *= 2
if t.resolveDelay > maxResolveDelay { if t.resolveDelay > maxResolveDelay {
t.resolveDelay = maxResolveDelay t.resolveDelay = maxResolveDelay
} }
srv.log.Debug("Resolving node failed", "id", t.dest.ID(), "newdelay", t.resolveDelay) d.log.Debug("Resolving node failed", "id", t.dest.ID(), "newdelay", t.resolveDelay)
return false return false
} }
// The node was found. // The node was found.
t.resolveDelay = initialResolveDelay t.resolveDelay = initialResolveDelay
t.dest = resolved t.dest = resolved
srv.log.Debug("Resolved node", "id", t.dest.ID(), "addr", &net.TCPAddr{IP: t.dest.IP(), Port: t.dest.TCP()}) d.log.Debug("Resolved node", "id", t.dest.ID(), "addr", &net.TCPAddr{IP: t.dest.IP(), Port: t.dest.TCP()})
return true return true
} }
type dialError struct {
error
}
// dial performs the actual connection attempt. // dial performs the actual connection attempt.
func (t *dialTask) dial(srv *Server, dest *enode.Node) error { func (t *dialTask) dial(d *dialScheduler, dest *enode.Node) error {
fd, err := srv.Dialer.Dial(dest) fd, err := d.dialer.Dial(d.ctx, t.dest)
if err != nil { if err != nil {
d.log.Trace("Dial error", "id", t.dest.ID(), "addr", nodeAddr(t.dest), "conn", t.flags, "err", cleanupDialErr(err))
return &dialError{err} return &dialError{err}
} }
mfd := newMeteredConn(fd, false, &net.TCPAddr{IP: dest.IP(), Port: dest.TCP()}) mfd := newMeteredConn(fd, false, &net.TCPAddr{IP: dest.IP(), Port: dest.TCP()})
return srv.SetupConn(mfd, t.flags, dest) return d.setupFunc(mfd, t.flags, dest)
} }
func (t *dialTask) String() string { func (t *dialTask) String() string {
@ -313,37 +540,9 @@ func (t *dialTask) String() string {
return fmt.Sprintf("%v %x %v:%d", t.flags, id[:8], t.dest.IP(), t.dest.TCP()) return fmt.Sprintf("%v %x %v:%d", t.flags, id[:8], t.dest.IP(), t.dest.TCP())
} }
// discoverTask runs discovery table operations. func cleanupDialErr(err error) error {
// Only one discoverTask is active at any time. if netErr, ok := err.(*net.OpError); ok && netErr.Op == "dial" {
// discoverTask.Do performs a random lookup. return netErr.Err
type discoverTask struct {
want int
results []*enode.Node
}
func (t *discoverTask) Do(srv *Server) {
t.results = enode.ReadNodes(srv.discmix, t.want)
}
func (t *discoverTask) String() string {
s := "discovery query"
if len(t.results) > 0 {
s += fmt.Sprintf(" (%d results)", len(t.results))
} else {
s += fmt.Sprintf(" (want %d)", t.want)
} }
return s return err
}
// A waitExpireTask is generated if there are no other tasks
// to keep the loop in Server.run ticking.
type waitExpireTask struct {
time.Duration
}
func (t waitExpireTask) Do(*Server) {
time.Sleep(t.Duration)
}
func (t waitExpireTask) String() string {
return fmt.Sprintf("wait for dial hist expire (%v)", t.Duration)
} }

1084
p2p/dial_test.go
View File

File diff suppressed because it is too large Load Diff

44
p2p/peer_test.go
View File

@ -17,15 +17,20 @@
package p2p package p2p
import ( import (
"encoding/binary"
"errors" "errors"
"fmt" "fmt"
"math/rand" "math/rand"
"net" "net"
"reflect" "reflect"
"strconv"
"strings"
"testing" "testing"
"time" "time"
"github.com/ethereum/go-ethereum/log" "github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/p2p/enode"
"github.com/ethereum/go-ethereum/p2p/enr"
) )
var discard = Protocol{ var discard = Protocol{
@ -45,10 +50,45 @@ var discard = Protocol{
}, },
} }
// uintID encodes i into a node ID.
func uintID(i uint16) enode.ID {
var id enode.ID
binary.BigEndian.PutUint16(id[:], i)
return id
}
// newNode creates a node record with the given address.
func newNode(id enode.ID, addr string) *enode.Node {
var r enr.Record
if addr != "" {
// Set the port if present.
if strings.Contains(addr, ":") {
hs, ps, err := net.SplitHostPort(addr)
if err != nil {
panic(fmt.Errorf("invalid address %q", addr))
}
port, err := strconv.Atoi(ps)
if err != nil {
panic(fmt.Errorf("invalid port in %q", addr))
}
r.Set(enr.TCP(port))
r.Set(enr.UDP(port))
addr = hs
}
// Set the IP.
ip := net.ParseIP(addr)
if ip == nil {
panic(fmt.Errorf("invalid IP %q", addr))
}
r.Set(enr.IP(ip))
}
return enode.SignNull(&r, id)
}
func testPeer(protos []Protocol) (func(), *conn, *Peer, <-chan error) { func testPeer(protos []Protocol) (func(), *conn, *Peer, <-chan error) {
fd1, fd2 := net.Pipe() fd1, fd2 := net.Pipe()
c1 := &conn{fd: fd1, node: newNode(randomID(), nil), transport: newTestTransport(&newkey().PublicKey, fd1)} c1 := &conn{fd: fd1, node: newNode(randomID(), ""), transport: newTestTransport(&newkey().PublicKey, fd1)}
c2 := &conn{fd: fd2, node: newNode(randomID(), nil), transport: newTestTransport(&newkey().PublicKey, fd2)} c2 := &conn{fd: fd2, node: newNode(randomID(), ""), transport: newTestTransport(&newkey().PublicKey, fd2)}
for _, p := range protos { for _, p := range protos {
c1.caps = append(c1.caps, p.cap()) c1.caps = append(c1.caps, p.cap())
c2.caps = append(c2.caps, p.cap()) c2.caps = append(c2.caps, p.cap())

320
p2p/server.go
View File

@ -51,7 +51,6 @@ const (
discmixTimeout = 5 * time.Second discmixTimeout = 5 * time.Second
// Connectivity defaults. // Connectivity defaults.
maxActiveDialTasks = 16
defaultMaxPendingPeers = 50 defaultMaxPendingPeers = 50
defaultDialRatio = 3 defaultDialRatio = 3
@ -156,6 +155,8 @@ type Config struct {
// Logger is a custom logger to use with the p2p.Server. // Logger is a custom logger to use with the p2p.Server.
Logger log.Logger `toml:",omitempty"` Logger log.Logger `toml:",omitempty"`
clock mclock.Clock
} }
// Server manages all peer connections. // Server manages all peer connections.
@ -183,13 +184,10 @@ type Server struct {
ntab *discover.UDPv4 ntab *discover.UDPv4
DiscV5 *discv5.Network DiscV5 *discv5.Network
discmix *enode.FairMix discmix *enode.FairMix
dialsched *dialScheduler
staticNodeResolver nodeResolver
// Channels into the run loop. // Channels into the run loop.
quit chan struct{} quit chan struct{}
addstatic chan *enode.Node
removestatic chan *enode.Node
addtrusted chan *enode.Node addtrusted chan *enode.Node
removetrusted chan *enode.Node removetrusted chan *enode.Node
peerOp chan peerOpFunc peerOp chan peerOpFunc
@ -302,47 +300,57 @@ func (srv *Server) LocalNode() *enode.LocalNode {
// Peers returns all connected peers. // Peers returns all connected peers.
func (srv *Server) Peers() []*Peer { func (srv *Server) Peers() []*Peer {
var ps []*Peer var ps []*Peer
select { srv.doPeerOp(func(peers map[enode.ID]*Peer) {
// Note: We'd love to put this function into a variable but
// that seems to cause a weird compiler error in some
// environments.
case srv.peerOp <- func(peers map[enode.ID]*Peer) {
for _, p := range peers { for _, p := range peers {
ps = append(ps, p) ps = append(ps, p)
} }
}: })
<-srv.peerOpDone
case <-srv.quit:
}
return ps return ps
} }
// PeerCount returns the number of connected peers. // PeerCount returns the number of connected peers.
func (srv *Server) PeerCount() int { func (srv *Server) PeerCount() int {
var count int var count int
select { srv.doPeerOp(func(ps map[enode.ID]*Peer) {
case srv.peerOp <- func(ps map[enode.ID]*Peer) { count = len(ps) }: count = len(ps)
<-srv.peerOpDone })
case <-srv.quit:
}
return count return count
} }
// AddPeer connects to the given node and maintains the connection until the // AddPeer adds the given node to the static node set. When there is room in the peer set,
// server is shut down. If the connection fails for any reason, the server will // the server will connect to the node. If the connection fails for any reason, the server
// attempt to reconnect the peer. // will attempt to reconnect the peer.
func (srv *Server) AddPeer(node *enode.Node) { func (srv *Server) AddPeer(node *enode.Node) {
select { srv.dialsched.addStatic(node)
case srv.addstatic <- node:
case <-srv.quit:
}
} }
// RemovePeer disconnects from the given node // RemovePeer removes a node from the static node set. It also disconnects from the given
// node if it is currently connected as a peer.
//
// This method blocks until all protocols have exited and the peer is removed. Do not use
// RemovePeer in protocol implementations, call Disconnect on the Peer instead.
func (srv *Server) RemovePeer(node *enode.Node) { func (srv *Server) RemovePeer(node *enode.Node) {
select { var (
case srv.removestatic <- node: ch chan *PeerEvent
case <-srv.quit: sub event.Subscription
)
// Disconnect the peer on the main loop.
srv.doPeerOp(func(peers map[enode.ID]*Peer) {
srv.dialsched.removeStatic(node)
if peer := peers[node.ID()]; peer != nil {
ch = make(chan *PeerEvent, 1)
sub = srv.peerFeed.Subscribe(ch)
peer.Disconnect(DiscRequested)
}
})
// Wait for the peer connection to end.
if ch != nil {
defer sub.Unsubscribe()
for ev := range ch {
if ev.Peer == node.ID() && ev.Type == PeerEventTypeDrop {
return
}
}
} }
} }
@ -437,6 +445,9 @@ func (srv *Server) Start() (err error) {
if srv.log == nil { if srv.log == nil {
srv.log = log.Root() srv.log = log.Root()
} }
if srv.clock == nil {
srv.clock = mclock.System{}
}
if srv.NoDial && srv.ListenAddr == "" { if srv.NoDial && srv.ListenAddr == "" {
srv.log.Warn("P2P server will be useless, neither dialing nor listening") srv.log.Warn("P2P server will be useless, neither dialing nor listening")
} }
@ -451,15 +462,10 @@ func (srv *Server) Start() (err error) {
if srv.listenFunc == nil { if srv.listenFunc == nil {
srv.listenFunc = net.Listen srv.listenFunc = net.Listen
} }
if srv.Dialer == nil {
srv.Dialer = TCPDialer{&net.Dialer{Timeout: defaultDialTimeout}}
}
srv.quit = make(chan struct{}) srv.quit = make(chan struct{})
srv.delpeer = make(chan peerDrop) srv.delpeer = make(chan peerDrop)
srv.checkpointPostHandshake = make(chan *conn) srv.checkpointPostHandshake = make(chan *conn)
srv.checkpointAddPeer = make(chan *conn) srv.checkpointAddPeer = make(chan *conn)
srv.addstatic = make(chan *enode.Node)
srv.removestatic = make(chan *enode.Node)
srv.addtrusted = make(chan *enode.Node) srv.addtrusted = make(chan *enode.Node)
srv.removetrusted = make(chan *enode.Node) srv.removetrusted = make(chan *enode.Node)
srv.peerOp = make(chan peerOpFunc) srv.peerOp = make(chan peerOpFunc)
@ -476,11 +482,10 @@ func (srv *Server) Start() (err error) {
if err := srv.setupDiscovery(); err != nil { if err := srv.setupDiscovery(); err != nil {
return err return err
} }
srv.setupDialScheduler()
dynPeers := srv.maxDialedConns()
dialer := newDialState(srv.localnode.ID(), dynPeers, &srv.Config)
srv.loopWG.Add(1) srv.loopWG.Add(1)
go srv.run(dialer) go srv.run()
return nil return nil
} }
@ -583,7 +588,6 @@ func (srv *Server) setupDiscovery() error {
} }
srv.ntab = ntab srv.ntab = ntab
srv.discmix.AddSource(ntab.RandomNodes()) srv.discmix.AddSource(ntab.RandomNodes())
srv.staticNodeResolver = ntab
} }
// Discovery V5 // Discovery V5
@ -606,6 +610,47 @@ func (srv *Server) setupDiscovery() error {
return nil return nil
} }
func (srv *Server) setupDialScheduler() {
config := dialConfig{
self: srv.localnode.ID(),
maxDialPeers: srv.maxDialedConns(),
maxActiveDials: srv.MaxPendingPeers,
log: srv.Logger,
netRestrict: srv.NetRestrict,
dialer: srv.Dialer,
clock: srv.clock,
}
if srv.ntab != nil {
config.resolver = srv.ntab
}
if config.dialer == nil {
config.dialer = tcpDialer{&net.Dialer{Timeout: defaultDialTimeout}}
}
srv.dialsched = newDialScheduler(config, srv.discmix, srv.SetupConn)
for _, n := range srv.StaticNodes {
srv.dialsched.addStatic(n)
}
}
func (srv *Server) maxInboundConns() int {
return srv.MaxPeers - srv.maxDialedConns()
}
func (srv *Server) maxDialedConns() (limit int) {
if srv.NoDial || srv.MaxPeers == 0 {
return 0
}
if srv.DialRatio == 0 {
limit = srv.MaxPeers / defaultDialRatio
} else {
limit = srv.MaxPeers / srv.DialRatio
}
if limit == 0 {
limit = 1
}
return limit
}
func (srv *Server) setupListening() error { func (srv *Server) setupListening() error {
// Launch the listener. // Launch the listener.
listener, err := srv.listenFunc("tcp", srv.ListenAddr) listener, err := srv.listenFunc("tcp", srv.ListenAddr)
@ -632,112 +677,55 @@ func (srv *Server) setupListening() error {
return nil return nil
} }
type dialer interface { // doPeerOp runs fn on the main loop.
newTasks(running int, peers map[enode.ID]*Peer, now time.Time) []task func (srv *Server) doPeerOp(fn peerOpFunc) {
taskDone(task, time.Time) select {
addStatic(*enode.Node) case srv.peerOp <- fn:
removeStatic(*enode.Node) <-srv.peerOpDone
case <-srv.quit:
}
} }
func (srv *Server) run(dialstate dialer) { // run is the main loop of the server.
func (srv *Server) run() {
srv.log.Info("Started P2P networking", "self", srv.localnode.Node().URLv4()) srv.log.Info("Started P2P networking", "self", srv.localnode.Node().URLv4())
defer srv.loopWG.Done() defer srv.loopWG.Done()
defer srv.nodedb.Close() defer srv.nodedb.Close()
defer srv.discmix.Close() defer srv.discmix.Close()
defer srv.dialsched.stop()
var ( var (
peers = make(map[enode.ID]*Peer) peers = make(map[enode.ID]*Peer)
inboundCount = 0 inboundCount = 0
trusted = make(map[enode.ID]bool, len(srv.TrustedNodes)) trusted = make(map[enode.ID]bool, len(srv.TrustedNodes))
taskdone = make(chan task, maxActiveDialTasks)
tick = time.NewTicker(30 * time.Second)
runningTasks []task
queuedTasks []task // tasks that can't run yet
) )
defer tick.Stop()
// Put trusted nodes into a map to speed up checks. // Put trusted nodes into a map to speed up checks.
// Trusted peers are loaded on startup or added via AddTrustedPeer RPC. // Trusted peers are loaded on startup or added via AddTrustedPeer RPC.
for _, n := range srv.TrustedNodes { for _, n := range srv.TrustedNodes {
trusted[n.ID()] = true trusted[n.ID()] = true
} }
// removes t from runningTasks
delTask := func(t task) {
for i := range runningTasks {
if runningTasks[i] == t {
runningTasks = append(runningTasks[:i], runningTasks[i+1:]...)
break
}
}
}
// starts until max number of active tasks is satisfied
startTasks := func(ts []task) (rest []task) {
i := 0
for ; len(runningTasks) < maxActiveDialTasks && i < len(ts); i++ {
t := ts[i]
srv.log.Trace("New dial task", "task", t)
go func() { t.Do(srv); taskdone <- t }()
runningTasks = append(runningTasks, t)
}
return ts[i:]
}
scheduleTasks := func() {
// Start from queue first.
queuedTasks = append(queuedTasks[:0], startTasks(queuedTasks)...)
// Query dialer for new tasks and start as many as possible now.
if len(runningTasks) < maxActiveDialTasks {
nt := dialstate.newTasks(len(runningTasks)+len(queuedTasks), peers, time.Now())
queuedTasks = append(queuedTasks, startTasks(nt)...)
}
}
running: running:
for { for {
scheduleTasks()
select { select {
case <-tick.C:
// This is just here to ensure the dial scheduler runs occasionally.
case <-srv.quit: case <-srv.quit:
// The server was stopped. Run the cleanup logic. // The server was stopped. Run the cleanup logic.
break running break running
case n := <-srv.addstatic:
// This channel is used by AddPeer to add to the
// ephemeral static peer list. Add it to the dialer,
// it will keep the node connected.
srv.log.Trace("Adding static node", "node", n)
dialstate.addStatic(n)
case n := <-srv.removestatic:
// This channel is used by RemovePeer to send a
// disconnect request to a peer and begin the
// stop keeping the node connected.
srv.log.Trace("Removing static node", "node", n)
dialstate.removeStatic(n)
if p, ok := peers[n.ID()]; ok {
p.Disconnect(DiscRequested)
}
case n := <-srv.addtrusted: case n := <-srv.addtrusted:
// This channel is used by AddTrustedPeer to add an enode // This channel is used by AddTrustedPeer to add a node
// to the trusted node set. // to the trusted node set.
srv.log.Trace("Adding trusted node", "node", n) srv.log.Trace("Adding trusted node", "node", n)
trusted[n.ID()] = true trusted[n.ID()] = true
// Mark any already-connected peer as trusted
if p, ok := peers[n.ID()]; ok { if p, ok := peers[n.ID()]; ok {
p.rw.set(trustedConn, true) p.rw.set(trustedConn, true)
} }
case n := <-srv.removetrusted: case n := <-srv.removetrusted:
// This channel is used by RemoveTrustedPeer to remove an enode // This channel is used by RemoveTrustedPeer to remove a node
// from the trusted node set. // from the trusted node set.
srv.log.Trace("Removing trusted node", "node", n) srv.log.Trace("Removing trusted node", "node", n)
delete(trusted, n.ID()) delete(trusted, n.ID())
// Unmark any already-connected peer as trusted
if p, ok := peers[n.ID()]; ok { if p, ok := peers[n.ID()]; ok {
p.rw.set(trustedConn, false) p.rw.set(trustedConn, false)
} }
@ -747,14 +735,6 @@ running:
op(peers) op(peers)
srv.peerOpDone <- struct{}{} srv.peerOpDone <- struct{}{}
case t := <-taskdone:
// A task got done. Tell dialstate about it so it
// can update its state and remove it from the active
// tasks list.
srv.log.Trace("Dial task done", "task", t)
dialstate.taskDone(t, time.Now())
delTask(t)
case c := <-srv.checkpointPostHandshake: case c := <-srv.checkpointPostHandshake:
// A connection has passed the encryption handshake so // A connection has passed the encryption handshake so
// the remote identity is known (but hasn't been verified yet). // the remote identity is known (but hasn't been verified yet).
@ -771,33 +751,25 @@ running:
err := srv.addPeerChecks(peers, inboundCount, c) err := srv.addPeerChecks(peers, inboundCount, c)
if err == nil { if err == nil {
// The handshakes are done and it passed all checks. // The handshakes are done and it passed all checks.
p := newPeer(srv.log, c, srv.Protocols) p := srv.launchPeer(c)
// If message events are enabled, pass the peerFeed
// to the peer
if srv.EnableMsgEvents {
p.events = &srv.peerFeed
}
name := truncateName(c.name)
p.log.Debug("Adding p2p peer", "addr", p.RemoteAddr(), "peers", len(peers)+1, "name", name)
go srv.runPeer(p)
peers[c.node.ID()] = p peers[c.node.ID()] = p
if p.Inbound() { srv.log.Debug("Adding p2p peer", "peercount", len(peers), "id", p.ID(), "conn", c.flags, "addr", p.RemoteAddr(), "name", truncateName(c.name))
inboundCount++ srv.dialsched.peerAdded(c)
}
if conn, ok := c.fd.(*meteredConn); ok { if conn, ok := c.fd.(*meteredConn); ok {
conn.handshakeDone(p) conn.handshakeDone(p)
} }
if p.Inbound() {
inboundCount++
}
} }
// The dialer logic relies on the assumption that
// dial tasks complete after the peer has been added or
// discarded. Unblock the task last.
c.cont <- err c.cont <- err
case pd := <-srv.delpeer: case pd := <-srv.delpeer:
// A peer disconnected. // A peer disconnected.
d := common.PrettyDuration(mclock.Now() - pd.created) d := common.PrettyDuration(mclock.Now() - pd.created)
pd.log.Debug("Removing p2p peer", "addr", pd.RemoteAddr(), "peers", len(peers)-1, "duration", d, "req", pd.requested, "err", pd.err)
delete(peers, pd.ID()) delete(peers, pd.ID())
srv.log.Debug("Removing p2p peer", "peercount", len(peers), "id", pd.ID(), "duration", d, "req", pd.requested, "err", pd.err)
srv.dialsched.peerRemoved(pd.rw)
if pd.Inbound() { if pd.Inbound() {
inboundCount-- inboundCount--
} }
@ -822,14 +794,14 @@ running:
// is closed. // is closed.
for len(peers) > 0 { for len(peers) > 0 {
p := <-srv.delpeer p := <-srv.delpeer
p.log.Trace("<-delpeer (spindown)", "remainingTasks", len(runningTasks)) p.log.Trace("<-delpeer (spindown)")
delete(peers, p.ID()) delete(peers, p.ID())
} }
} }
func (srv *Server) postHandshakeChecks(peers map[enode.ID]*Peer, inboundCount int, c *conn) error { func (srv *Server) postHandshakeChecks(peers map[enode.ID]*Peer, inboundCount int, c *conn) error {
switch { switch {
case !c.is(trustedConn|staticDialedConn) && len(peers) >= srv.MaxPeers: case !c.is(trustedConn) && len(peers) >= srv.MaxPeers:
return DiscTooManyPeers return DiscTooManyPeers
case !c.is(trustedConn) && c.is(inboundConn) && inboundCount >= srv.maxInboundConns(): case !c.is(trustedConn) && c.is(inboundConn) && inboundCount >= srv.maxInboundConns():
return DiscTooManyPeers return DiscTooManyPeers
@ -852,21 +824,6 @@ func (srv *Server) addPeerChecks(peers map[enode.ID]*Peer, inboundCount int, c *
return srv.postHandshakeChecks(peers, inboundCount, c) return srv.postHandshakeChecks(peers, inboundCount, c)
} }
func (srv *Server) maxInboundConns() int {
return srv.MaxPeers - srv.maxDialedConns()
}
func (srv *Server) maxDialedConns() int {
if srv.NoDiscovery || srv.NoDial {
return 0
}
r := srv.DialRatio
if r == 0 {
r = defaultDialRatio
}
return srv.MaxPeers / r
}
// listenLoop runs in its own goroutine and accepts // listenLoop runs in its own goroutine and accepts
// inbound connections. // inbound connections.
func (srv *Server) listenLoop() { func (srv *Server) listenLoop() {
@ -935,18 +892,20 @@ func (srv *Server) listenLoop() {
} }
func (srv *Server) checkInboundConn(fd net.Conn, remoteIP net.IP) error { func (srv *Server) checkInboundConn(fd net.Conn, remoteIP net.IP) error {
if remoteIP != nil { if remoteIP == nil {
// Reject connections that do not match NetRestrict. return nil
if srv.NetRestrict != nil && !srv.NetRestrict.Contains(remoteIP) {
return fmt.Errorf("not whitelisted in NetRestrict")
}
// Reject Internet peers that try too often.
srv.inboundHistory.expire(time.Now())
if !netutil.IsLAN(remoteIP) && srv.inboundHistory.contains(remoteIP.String()) {
return fmt.Errorf("too many attempts")
}
srv.inboundHistory.add(remoteIP.String(), time.Now().Add(inboundThrottleTime))
} }
// Reject connections that do not match NetRestrict.
if srv.NetRestrict != nil && !srv.NetRestrict.Contains(remoteIP) {
return fmt.Errorf("not whitelisted in NetRestrict")
}
// Reject Internet peers that try too often.
now := srv.clock.Now()
srv.inboundHistory.expire(now, nil)
if !netutil.IsLAN(remoteIP) && srv.inboundHistory.contains(remoteIP.String()) {
return fmt.Errorf("too many attempts")
}
srv.inboundHistory.add(remoteIP.String(), now.Add(inboundThrottleTime))
return nil return nil
} }
@ -958,7 +917,6 @@ func (srv *Server) SetupConn(fd net.Conn, flags connFlag, dialDest *enode.Node)
err := srv.setupConn(c, flags, dialDest) err := srv.setupConn(c, flags, dialDest)
if err != nil { if err != nil {
c.close(err) c.close(err)
srv.log.Trace("Setting up connection failed", "addr", fd.RemoteAddr(), "err", err)
} }
return err return err
} }
@ -977,7 +935,9 @@ func (srv *Server) setupConn(c *conn, flags connFlag, dialDest *enode.Node) erro
if dialDest != nil { if dialDest != nil {
dialPubkey = new(ecdsa.PublicKey) dialPubkey = new(ecdsa.PublicKey)
if err := dialDest.Load((*enode.Secp256k1)(dialPubkey)); err != nil { if err := dialDest.Load((*enode.Secp256k1)(dialPubkey)); err != nil {
return errors.New("dial destination doesn't have a secp256k1 public key") err = errors.New("dial destination doesn't have a secp256k1 public key")
srv.log.Trace("Setting up connection failed", "addr", c.fd.RemoteAddr(), "conn", c.flags, "err", err)
return err
} }
} }
@ -1006,7 +966,7 @@ func (srv *Server) setupConn(c *conn, flags connFlag, dialDest *enode.Node) erro
// Run the capability negotiation handshake. // Run the capability negotiation handshake.
phs, err := c.doProtoHandshake(srv.ourHandshake) phs, err := c.doProtoHandshake(srv.ourHandshake)
if err != nil { if err != nil {
clog.Trace("Failed proto handshake", "err", err) clog.Trace("Failed p2p handshake", "err", err)
return err return err
} }
if id := c.node.ID(); !bytes.Equal(crypto.Keccak256(phs.ID), id[:]) { if id := c.node.ID(); !bytes.Equal(crypto.Keccak256(phs.ID), id[:]) {
@ -1020,9 +980,6 @@ func (srv *Server) setupConn(c *conn, flags connFlag, dialDest *enode.Node) erro
return err return err
} }
// If the checks completed successfully, the connection has been added as a peer and
// runPeer has been launched.
clog.Trace("Connection set up", "inbound", dialDest == nil)
return nil return nil
} }
@ -1054,15 +1011,22 @@ func (srv *Server) checkpoint(c *conn, stage chan<- *conn) error {
return <-c.cont return <-c.cont
} }
func (srv *Server) launchPeer(c *conn) *Peer {
p := newPeer(srv.log, c, srv.Protocols)
if srv.EnableMsgEvents {
// If message events are enabled, pass the peerFeed
// to the peer.
p.events = &srv.peerFeed
}
go srv.runPeer(p)
return p
}
// runPeer runs in its own goroutine for each peer. // runPeer runs in its own goroutine for each peer.
// it waits until the Peer logic returns and removes
// the peer.
func (srv *Server) runPeer(p *Peer) { func (srv *Server) runPeer(p *Peer) {
if srv.newPeerHook != nil { if srv.newPeerHook != nil {
srv.newPeerHook(p) srv.newPeerHook(p)
} }
// broadcast peer add
srv.peerFeed.Send(&PeerEvent{ srv.peerFeed.Send(&PeerEvent{
Type: PeerEventTypeAdd, Type: PeerEventTypeAdd,
Peer: p.ID(), Peer: p.ID(),
@ -1070,10 +1034,18 @@ func (srv *Server) runPeer(p *Peer) {
LocalAddress: p.LocalAddr().String(), LocalAddress: p.LocalAddr().String(),
}) })
// run the protocol // Run the per-peer main loop.
remoteRequested, err := p.run() remoteRequested, err := p.run()
// broadcast peer drop // Announce disconnect on the main loop to update the peer set.
// The main loop waits for existing peers to be sent on srv.delpeer
// before returning, so this send should not select on srv.quit.
srv.delpeer <- peerDrop{p, err, remoteRequested}
// Broadcast peer drop to external subscribers. This needs to be
// after the send to delpeer so subscribers have a consistent view of
// the peer set (i.e. Server.Peers() doesn't include the peer when the
// event is received.
srv.peerFeed.Send(&PeerEvent{ srv.peerFeed.Send(&PeerEvent{
Type: PeerEventTypeDrop, Type: PeerEventTypeDrop,
Peer: p.ID(), Peer: p.ID(),
@ -1081,10 +1053,6 @@ func (srv *Server) runPeer(p *Peer) {
RemoteAddress: p.RemoteAddr().String(), RemoteAddress: p.RemoteAddr().String(),
LocalAddress: p.LocalAddr().String(), LocalAddress: p.LocalAddr().String(),
}) })
// Note: run waits for existing peers to be sent on srv.delpeer
// before returning, so this send should not select on srv.quit.
srv.delpeer <- peerDrop{p, err, remoteRequested}
} }
// NodeInfo represents a short summary of the information known about the host. // NodeInfo represents a short summary of the information known about the host.

218
p2p/server_test.go
View File

@ -34,10 +34,6 @@ import (
"golang.org/x/crypto/sha3" "golang.org/x/crypto/sha3"
) )
// func init() {
// log.Root().SetHandler(log.LvlFilterHandler(log.LvlTrace, log.StreamHandler(os.Stderr, log.TerminalFormat(false))))
// }
type testTransport struct { type testTransport struct {
rpub *ecdsa.PublicKey rpub *ecdsa.PublicKey
*rlpx *rlpx
@ -72,11 +68,12 @@ func (c *testTransport) close(err error) {
func startTestServer(t *testing.T, remoteKey *ecdsa.PublicKey, pf func(*Peer)) *Server { func startTestServer(t *testing.T, remoteKey *ecdsa.PublicKey, pf func(*Peer)) *Server {
config := Config{ config := Config{
Name: "test", Name: "test",
MaxPeers: 10, MaxPeers: 10,
ListenAddr: "127.0.0.1:0", ListenAddr: "127.0.0.1:0",
PrivateKey: newkey(), NoDiscovery: true,
Logger: testlog.Logger(t, log.LvlTrace), PrivateKey: newkey(),
Logger: testlog.Logger(t, log.LvlTrace),
} }
server := &Server{ server := &Server{
Config: config, Config: config,
@ -131,11 +128,10 @@ func TestServerDial(t *testing.T) {
t.Fatalf("could not setup listener: %v", err) t.Fatalf("could not setup listener: %v", err)
} }
defer listener.Close() defer listener.Close()
accepted := make(chan net.Conn) accepted := make(chan net.Conn, 1)
go func() { go func() {
conn, err := listener.Accept() conn, err := listener.Accept()
if err != nil { if err != nil {
t.Error("accept error:", err)
return return
} }
accepted <- conn accepted <- conn
@ -205,155 +201,38 @@ func TestServerDial(t *testing.T) {
} }
} }
// This test checks that tasks generated by dialstate are // This test checks that RemovePeer disconnects the peer if it is connected.
// actually executed and taskdone is called for them. func TestServerRemovePeerDisconnect(t *testing.T) {
func TestServerTaskScheduling(t *testing.T) { srv1 := &Server{Config: Config{
var ( PrivateKey: newkey(),
done = make(chan *testTask) MaxPeers: 1,
quit, returned = make(chan struct{}), make(chan struct{}) NoDiscovery: true,
tc = 0 Logger: testlog.Logger(t, log.LvlTrace).New("server", "1"),
tg = taskgen{ }}
newFunc: func(running int, peers map[enode.ID]*Peer) []task { srv2 := &Server{Config: Config{
tc++ PrivateKey: newkey(),
return []task{&testTask{index: tc - 1}} MaxPeers: 1,
}, NoDiscovery: true,
doneFunc: func(t task) { NoDial: true,
select { ListenAddr: "127.0.0.1:0",
case done <- t.(*testTask): Logger: testlog.Logger(t, log.LvlTrace).New("server", "2"),
case <-quit: }}
} srv1.Start()
}, defer srv1.Stop()
} srv2.Start()
) defer srv2.Stop()
// The Server in this test isn't actually running if !syncAddPeer(srv1, srv2.Self()) {
// because we're only interested in what run does. t.Fatal("peer not connected")
db, _ := enode.OpenDB("")
srv := &Server{
Config: Config{MaxPeers: 10},
localnode: enode.NewLocalNode(db, newkey()),
nodedb: db,
discmix: enode.NewFairMix(0),
quit: make(chan struct{}),
running: true,
log: log.New(),
} }
srv.loopWG.Add(1) srv1.RemovePeer(srv2.Self())
go func() { if srv1.PeerCount() > 0 {
srv.run(tg) t.Fatal("removed peer still connected")
close(returned)
}()
var gotdone []*testTask
for i := 0; i < 100; i++ {
gotdone = append(gotdone, <-done)
}
for i, task := range gotdone {
if task.index != i {
t.Errorf("task %d has wrong index, got %d", i, task.index)
break
}
if !task.called {
t.Errorf("task %d was not called", i)
break
}
}
close(quit)
srv.Stop()
select {
case <-returned:
case <-time.After(500 * time.Millisecond):
t.Error("Server.run did not return within 500ms")
} }
} }
// This test checks that Server doesn't drop tasks, // This test checks that connections are disconnected just after the encryption handshake
// even if newTasks returns more than the maximum number of tasks. // when the server is at capacity. Trusted connections should still be accepted.
func TestServerManyTasks(t *testing.T) {
alltasks := make([]task, 300)
for i := range alltasks {
alltasks[i] = &testTask{index: i}
}
var (
db, _ = enode.OpenDB("")
srv = &Server{
quit: make(chan struct{}),
localnode: enode.NewLocalNode(db, newkey()),
nodedb: db,
running: true,
log: log.New(),
discmix: enode.NewFairMix(0),
}
done = make(chan *testTask)
start, end = 0, 0
)
defer srv.Stop()
srv.loopWG.Add(1)
go srv.run(taskgen{
newFunc: func(running int, peers map[enode.ID]*Peer) []task {
start, end = end, end+maxActiveDialTasks+10
if end > len(alltasks) {
end = len(alltasks)
}
return alltasks[start:end]
},
doneFunc: func(tt task) {
done <- tt.(*testTask)
},
})
doneset := make(map[int]bool)
timeout := time.After(2 * time.Second)
for len(doneset) < len(alltasks) {
select {
case tt := <-done:
if doneset[tt.index] {
t.Errorf("task %d got done more than once", tt.index)
} else {
doneset[tt.index] = true
}
case <-timeout:
t.Errorf("%d of %d tasks got done within 2s", len(doneset), len(alltasks))
for i := 0; i < len(alltasks); i++ {
if !doneset[i] {
t.Logf("task %d not done", i)
}
}
return
}
}
}
type taskgen struct {
newFunc func(running int, peers map[enode.ID]*Peer) []task
doneFunc func(task)
}
func (tg taskgen) newTasks(running int, peers map[enode.ID]*Peer, now time.Time) []task {
return tg.newFunc(running, peers)
}
func (tg taskgen) taskDone(t task, now time.Time) {
tg.doneFunc(t)
}
func (tg taskgen) addStatic(*enode.Node) {
}
func (tg taskgen) removeStatic(*enode.Node) {
}
type testTask struct {
index int
called bool
}
func (t *testTask) Do(srv *Server) {
t.called = true
}
// This test checks that connections are disconnected
// just after the encryption handshake when the server is
// at capacity. Trusted connections should still be accepted.
func TestServerAtCap(t *testing.T) { func TestServerAtCap(t *testing.T) {
trustedNode := newkey() trustedNode := newkey()
trustedID := enode.PubkeyToIDV4(&trustedNode.PublicKey) trustedID := enode.PubkeyToIDV4(&trustedNode.PublicKey)
@ -363,7 +242,8 @@ func TestServerAtCap(t *testing.T) {
MaxPeers: 10, MaxPeers: 10,
NoDial: true, NoDial: true,
NoDiscovery: true, NoDiscovery: true,
TrustedNodes: []*enode.Node{newNode(trustedID, nil)}, TrustedNodes: []*enode.Node{newNode(trustedID, "")},
Logger: testlog.Logger(t, log.LvlTrace),
}, },
} }
if err := srv.Start(); err != nil { if err := srv.Start(); err != nil {
@ -401,14 +281,14 @@ func TestServerAtCap(t *testing.T) {
} }
// Remove from trusted set and try again // Remove from trusted set and try again
srv.RemoveTrustedPeer(newNode(trustedID, nil)) srv.RemoveTrustedPeer(newNode(trustedID, ""))
c = newconn(trustedID) c = newconn(trustedID)
if err := srv.checkpoint(c, srv.checkpointPostHandshake); err != DiscTooManyPeers { if err := srv.checkpoint(c, srv.checkpointPostHandshake); err != DiscTooManyPeers {
t.Error("wrong error for insert:", err) t.Error("wrong error for insert:", err)
} }
// Add anotherID to trusted set and try again // Add anotherID to trusted set and try again
srv.AddTrustedPeer(newNode(anotherID, nil)) srv.AddTrustedPeer(newNode(anotherID, ""))
c = newconn(anotherID) c = newconn(anotherID)
if err := srv.checkpoint(c, srv.checkpointPostHandshake); err != nil { if err := srv.checkpoint(c, srv.checkpointPostHandshake); err != nil {
t.Error("unexpected error for trusted conn @posthandshake:", err) t.Error("unexpected error for trusted conn @posthandshake:", err)
@ -439,9 +319,9 @@ func TestServerPeerLimits(t *testing.T) {
NoDial: true, NoDial: true,
NoDiscovery: true, NoDiscovery: true,
Protocols: []Protocol{discard}, Protocols: []Protocol{discard},
Logger: testlog.Logger(t, log.LvlTrace),
}, },
newTransport: func(fd net.Conn) transport { return tp }, newTransport: func(fd net.Conn) transport { return tp },
log: log.New(),
} }
if err := srv.Start(); err != nil { if err := srv.Start(); err != nil {
t.Fatalf("couldn't start server: %v", err) t.Fatalf("couldn't start server: %v", err)
@ -724,3 +604,23 @@ func (l *fakeAddrListener) Accept() (net.Conn, error) {
func (c *fakeAddrConn) RemoteAddr() net.Addr { func (c *fakeAddrConn) RemoteAddr() net.Addr {
return c.remoteAddr return c.remoteAddr
} }
func syncAddPeer(srv *Server, node *enode.Node) bool {
var (
ch = make(chan *PeerEvent)
sub = srv.SubscribeEvents(ch)
timeout = time.After(2 * time.Second)
)
defer sub.Unsubscribe()
srv.AddPeer(node)
for {
select {
case ev := <-ch:
if ev.Type == PeerEventTypeAdd && ev.Peer == node.ID() {
return true
}
case <-timeout:
return false
}
}
}

3
p2p/simulations/adapters/inproc.go
View File

@ -17,6 +17,7 @@
package adapters package adapters
import ( import (
"context"
"errors" "errors"
"fmt" "fmt"
"math" "math"
@ -126,7 +127,7 @@ func (s *SimAdapter) NewNode(config *NodeConfig) (Node, error) {
// Dial implements the p2p.NodeDialer interface by connecting to the node using // Dial implements the p2p.NodeDialer interface by connecting to the node using
// an in-memory net.Pipe // an in-memory net.Pipe
func (s *SimAdapter) Dial(dest *enode.Node) (conn net.Conn, err error) { func (s *SimAdapter) Dial(ctx context.Context, dest *enode.Node) (conn net.Conn, err error) {
node, ok := s.GetNode(dest.ID()) node, ok := s.GetNode(dest.ID())
if !ok { if !ok {
return nil, fmt.Errorf("unknown node: %s", dest.ID()) return nil, fmt.Errorf("unknown node: %s", dest.ID())

20
p2p/util.go
View File

@ -18,7 +18,8 @@ package p2p
import ( import (
"container/heap" "container/heap"
"time"
"github.com/ethereum/go-ethereum/common/mclock"
) )
// expHeap tracks strings and their expiry time. // expHeap tracks strings and their expiry time.
@ -27,16 +28,16 @@ type expHeap []expItem
// expItem is an entry in addrHistory. // expItem is an entry in addrHistory.
type expItem struct { type expItem struct {
item string item string
exp time.Time exp mclock.AbsTime
} }
// nextExpiry returns the next expiry time. // nextExpiry returns the next expiry time.
func (h *expHeap) nextExpiry() time.Time { func (h *expHeap) nextExpiry() mclock.AbsTime {
return (*h)[0].exp return (*h)[0].exp
} }
// add adds an item and sets its expiry time. // add adds an item and sets its expiry time.
func (h *expHeap) add(item string, exp time.Time) { func (h *expHeap) add(item string, exp mclock.AbsTime) {
heap.Push(h, expItem{item, exp}) heap.Push(h, expItem{item, exp})
} }
@ -51,15 +52,18 @@ func (h expHeap) contains(item string) bool {
} }
// expire removes items with expiry time before 'now'. // expire removes items with expiry time before 'now'.
func (h *expHeap) expire(now time.Time) { func (h *expHeap) expire(now mclock.AbsTime, onExp func(string)) {
for h.Len() > 0 && h.nextExpiry().Before(now) { for h.Len() > 0 && h.nextExpiry() < now {
heap.Pop(h) item := heap.Pop(h)
if onExp != nil {
onExp(item.(expItem).item)
}
} }
} }
// heap.Interface boilerplate // heap.Interface boilerplate
func (h expHeap) Len() int { return len(h) } func (h expHeap) Len() int { return len(h) }
func (h expHeap) Less(i, j int) bool { return h[i].exp.Before(h[j].exp) } func (h expHeap) Less(i, j int) bool { return h[i].exp < h[j].exp }
func (h expHeap) Swap(i, j int) { h[i], h[j] = h[j], h[i] } func (h expHeap) Swap(i, j int) { h[i], h[j] = h[j], h[i] }
func (h *expHeap) Push(x interface{}) { *h = append(*h, x.(expItem)) } func (h *expHeap) Push(x interface{}) { *h = append(*h, x.(expItem)) }
func (h *expHeap) Pop() interface{} { func (h *expHeap) Pop() interface{} {

12
p2p/util_test.go
View File

@ -19,30 +19,32 @@ package p2p
import ( import (
"testing" "testing"
"time" "time"
"github.com/ethereum/go-ethereum/common/mclock"
) )
func TestExpHeap(t *testing.T) { func TestExpHeap(t *testing.T) {
var h expHeap var h expHeap
var ( var (
basetime = time.Unix(4000, 0) basetime = mclock.AbsTime(10)
exptimeA = basetime.Add(2 * time.Second) exptimeA = basetime.Add(2 * time.Second)
exptimeB = basetime.Add(3 * time.Second) exptimeB = basetime.Add(3 * time.Second)
exptimeC = basetime.Add(4 * time.Second) exptimeC = basetime.Add(4 * time.Second)
) )
h.add("a", exptimeA)
h.add("b", exptimeB) h.add("b", exptimeB)
h.add("a", exptimeA)
h.add("c", exptimeC) h.add("c", exptimeC)
if !h.nextExpiry().Equal(exptimeA) { if h.nextExpiry() != exptimeA {
t.Fatal("wrong nextExpiry") t.Fatal("wrong nextExpiry")
} }
if !h.contains("a") || !h.contains("b") || !h.contains("c") { if !h.contains("a") || !h.contains("b") || !h.contains("c") {
t.Fatal("heap doesn't contain all live items") t.Fatal("heap doesn't contain all live items")
} }
h.expire(exptimeA.Add(1)) h.expire(exptimeA.Add(1), nil)
if !h.nextExpiry().Equal(exptimeB) { if h.nextExpiry() != exptimeB {
t.Fatal("wrong nextExpiry") t.Fatal("wrong nextExpiry")
} }
if h.contains("a") { if h.contains("a") {