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crawl_util.go
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crawl_util.go
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package crawl
import (
"sync"
"sync/atomic"
"time"
"github.com/ethereum/go-ethereum/p2p/enode"
"github.com/rs/zerolog/log"
"github.com/maticnetwork/polygon-cli/p2p"
)
type crawler struct {
input []*enode.Node
output p2p.NodeSet
disc resolver
iters []enode.Iterator
inputIter enode.Iterator
ch chan *enode.Node
closed chan struct{}
// settings
revalidateInterval time.Duration
mu sync.RWMutex
}
const (
nodeRemoved = iota
nodeSkipRecent
nodeSkipIncompat
nodeAdded
nodeUpdated
)
type resolver interface {
RequestENR(*enode.Node) (*enode.Node, error)
}
func newCrawler(input []*enode.Node, disc resolver, iters ...enode.Iterator) *crawler {
c := &crawler{
input: input,
output: make(p2p.NodeSet, len(input)),
disc: disc,
iters: iters,
inputIter: enode.IterNodes(input),
ch: make(chan *enode.Node),
closed: make(chan struct{}),
}
c.iters = append(c.iters, c.inputIter)
// Copy input to output initially. Any nodes that fail validation
// will be dropped from output during the run.
for _, n := range input {
c.output[n.ID()] = n.URLv4()
}
return c
}
func (c *crawler) run(timeout time.Duration, nthreads int) p2p.NodeSet {
var (
timeoutTimer = time.NewTimer(timeout)
timeoutCh <-chan time.Time
statusTicker = time.NewTicker(time.Second * 8)
doneCh = make(chan enode.Iterator, len(c.iters))
liveIters = len(c.iters)
)
if nthreads < 1 {
nthreads = 1
}
defer timeoutTimer.Stop()
defer statusTicker.Stop()
for _, it := range c.iters {
go c.runIterator(doneCh, it)
}
var (
added uint64
skipped uint64
recent uint64
wg sync.WaitGroup
)
wg.Add(nthreads)
for i := 0; i < nthreads; i++ {
go func() {
defer wg.Done()
for {
select {
case n := <-c.ch:
switch c.updateNode(n) {
case nodeSkipIncompat:
atomic.AddUint64(&skipped, 1)
case nodeSkipRecent:
atomic.AddUint64(&recent, 1)
case nodeAdded:
atomic.AddUint64(&added, 1)
}
case <-c.closed:
return
}
}
}()
}
loop:
for {
select {
case it := <-doneCh:
if it == c.inputIter {
// Enable timeout when we're done revalidating the input nodes.
log.Info().Int("len", len(c.input)).Msg("Revalidation of input set is done")
if timeout > 0 {
timeoutCh = timeoutTimer.C
}
}
if liveIters--; liveIters == 0 {
break loop
}
case <-timeoutCh:
break loop
case <-statusTicker.C:
log.Info().
Uint64("added", atomic.LoadUint64(&added)).
Uint64("ignored(recent)", atomic.LoadUint64(&recent)).
Uint64("ignored(incompatible)", atomic.LoadUint64(&skipped)).
Msg("Crawling in progress")
}
}
close(c.closed)
for _, it := range c.iters {
it.Close()
}
for ; liveIters > 0; liveIters-- {
<-doneCh
}
wg.Wait()
return c.output
}
func (c *crawler) runIterator(done chan<- enode.Iterator, it enode.Iterator) {
defer func() { done <- it }()
for it.Next() {
select {
case c.ch <- it.Node():
case <-c.closed:
return
}
}
}
// shouldSkipNode filters out nodes by their network id. If there is a status
// message, skip nodes that don't have the correct network id. Otherwise, skip
// nodes that are unable to peer.
func shouldSkipNode(n *enode.Node) bool {
if inputCrawlParams.NetworkID == 0 {
return false
}
conn, err := p2p.Dial(n)
if err != nil {
log.Error().Err(err).Msg("Dial failed")
return true
}
defer conn.Close()
hello, status, err := conn.Peer()
if err != nil {
log.Error().Err(err).Msg("Peer failed")
return true
}
log.Debug().Interface("hello", hello).Interface("status", status).Msg("Message received")
return inputCrawlParams.NetworkID != status.NetworkID
}
// updateNode updates the info about the given node, and returns a status about
// what changed.
func (c *crawler) updateNode(n *enode.Node) int {
c.mu.RLock()
_, ok := c.output[n.ID()]
c.mu.RUnlock()
if ok {
return nodeSkipRecent
}
// Filter out incompatible nodes.
if shouldSkipNode(n) {
return nodeSkipIncompat
}
nn, err := c.disc.RequestENR(n)
if err != nil {
return nodeSkipIncompat
}
// Store/update node in output set.
c.mu.Lock()
c.output[nn.ID()] = nn.URLv4()
c.mu.Unlock()
return nodeAdded
}