fluencelabs/go-libp2p-kad-dht
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query: fix error "leak"

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Long-running queries can build up large error sets that we never actually use.
This is exacerbated by https://github.com/libp2p/go-libp2p-swarm/pull/115.

fixes https://github.com/libp2p/go-libp2p-swarm/issues/119
This commit is contained in:
Steven Allen 2019-04-24 08:29:00 -07:00
parent ca611b1605
commit 3c9f5bcd92
1 changed files with 11 additions and 21 deletions
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32
query.go
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@ -2,9 +2,9 @@ package dht
import (
"context"
"errors"
"sync"
u "github.com/ipfs/go-ipfs-util"
logging "github.com/ipfs/go-log"
todoctr "github.com/ipfs/go-todocounter"
process "github.com/jbenet/goprocess"
@ -18,6 +18,9 @@ import (
notif "github.com/libp2p/go-libp2p-routing/notifications"
)
// ErrNoPeersQueried is returned when we failed to connect to any peers.
var ErrNoPeersQueried = errors.New("failed to query any peers")
var maxQueryConcurrency = AlphaValue
type dhtQuery struct {
@ -77,7 +80,6 @@ type dhtQueryRunner struct {
peersRemaining todoctr.Counter // peersToQuery + currently processing
result *dhtQueryResult // query result
errs u.MultiErr // result errors. maybe should be a map[peer.ID]error
rateLimit chan struct{} // processing semaphore
log logging.EventLogger
@ -155,23 +157,19 @@ func (r *dhtQueryRunner) Run(ctx context.Context, peers []peer.ID) (*dhtQueryRes
select {
case <-r.peersRemaining.Done():
r.proc.Close()
r.RLock()
defer r.RUnlock()
err = routing.ErrNotFound
// if every query to every peer failed, something must be very wrong.
if len(r.errs) > 0 && len(r.errs) == r.peersSeen.Size() {
logger.Debugf("query errs: %s", r.errs)
err = r.errs[0]
if r.peersQueried.Size() == 0 {
err = ErrNoPeersQueried
} else {
err = routing.ErrNotFound
}
case <-r.proc.Closed():
r.RLock()
defer r.RUnlock()
err = r.runCtx.Err()
}
r.RLock()
defer r.RUnlock()
if r.result != nil && r.result.success {
return r.result, nil
}
@ -257,10 +255,6 @@ func (r *dhtQueryRunner) dialPeer(ctx context.Context, p peer.ID) error {
ID: p,
})
r.Lock()
r.errs = append(r.errs, err)
r.Unlock()
// This peer is dropping out of the race.
r.peersRemaining.Decrement(1)
return err
@ -289,10 +283,6 @@ func (r *dhtQueryRunner) queryPeer(proc process.Process, p peer.ID) {
if err != nil {
logger.Debugf("ERROR worker for: %v %v", p, err)
r.Lock()
r.errs = append(r.errs, err)
r.Unlock()
} else if res.success {
logger.Debugf("SUCCESS worker for: %v %s", p, res)
r.Lock()