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discv5: only store crawl error if no query succeeded #55

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merged 2 commits into from
Feb 1, 2024
Merged

discv5: only store crawl error if no query succeeded #55

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d0b17e6
removed discv5 crawl error if 1 query succeeds
guillaumemichel Jan 31, 2024
9a1a685
fixed successful query detection
guillaumemichel Jan 31, 2024
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16 changes: 13 additions & 3 deletions discv5/crawler.go
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@ import (
"github.com/ethereum/go-ethereum/p2p/enode"
"github.com/libp2p/go-libp2p/core/network"
"github.com/libp2p/go-libp2p/core/peer"
"github.com/libp2p/go-libp2p/p2p/host/basic"
basichost "github.com/libp2p/go-libp2p/p2p/host/basic"
ma "github.com/multiformats/go-multiaddr"
log "github.com/sirupsen/logrus"
"go.uber.org/atomic"
Expand All @@ -25,6 +25,8 @@ import (
"github.com/dennis-tra/nebula-crawler/discvx"
)

const MaxCrawlRetriesAfterTimeout = 2 // magic

type CrawlerConfig struct {
DialTimeout time.Duration
AddrDialType config.AddrType
Expand Down Expand Up @@ -464,14 +466,14 @@ func (c *Crawler) crawlDiscV5(ctx context.Context, pi PeerInfo) chan DiscV5Resul
// internally, so we won't gain much by spawning multiple parallel go
// routines here. Stop the process as soon as we have received a timeout and
// don't let the following calls time out as well.
for i := 0; i <= discvx.NBuckets; i++ { // 15 is maximum
for i := 0; i <= discvx.NBuckets; i++ { // 17 is maximum
var neighbors []*enode.Node
neighbors, err = c.listener.FindNode(pi.Node, []uint{uint(discvx.HashBits - i)})
if err != nil {

if errors.Is(err, discvx.ErrTimeout) {
timeouts += 1
if timeouts < 2 {
if timeouts < MaxCrawlRetriesAfterTimeout {
continue
}
}
Expand All @@ -480,6 +482,7 @@ func (c *Crawler) crawlDiscV5(ctx context.Context, pi PeerInfo) chan DiscV5Resul
err = fmt.Errorf("getting closest peer with CPL %d: %w", i, err)
break
}
timeouts = 0

if result.RespondedAt == nil {
now := time.Now()
Expand Down Expand Up @@ -510,6 +513,13 @@ func (c *Crawler) crawlDiscV5(ctx context.Context, pi PeerInfo) chan DiscV5Resul
result.RoutingTable.Neighbors = append(result.RoutingTable.Neighbors, n)
}

// if we have at least a successful result, delete error
// bitwise operation checks whether errorBits is a power of 2 minus 1,
// if not, then there was at least one successful result
if result.Error != nil && (result.RoutingTable.ErrorBits&(result.RoutingTable.ErrorBits+1)) == 0 {
result.Error = nil
}

// if there was a connection error, parse it to a known one
if result.Error != nil {
result.ErrorStr = db.NetError(result.Error)
Expand Down
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