diff --git a/dht.go b/dht.go index 646804d3a31..c72098cf8dd 100644 --- a/dht.go +++ b/dht.go @@ -16,13 +16,11 @@ import ( "github.com/libp2p/go-libp2p-core/peerstore" "github.com/libp2p/go-libp2p-core/protocol" "github.com/libp2p/go-libp2p-core/routing" - "go.uber.org/zap" - - "go.opencensus.io/tag" "github.com/libp2p/go-libp2p-kad-dht/metrics" pb "github.com/libp2p/go-libp2p-kad-dht/pb" "github.com/libp2p/go-libp2p-kad-dht/providers" + "github.com/libp2p/go-libp2p-kad-dht/rtrefresh" kb "github.com/libp2p/go-libp2p-kbucket" record "github.com/libp2p/go-libp2p-record" recpb "github.com/libp2p/go-libp2p-record/pb" @@ -35,6 +33,8 @@ import ( "github.com/multiformats/go-base32" ma "github.com/multiformats/go-multiaddr" "github.com/multiformats/go-multihash" + "go.opencensus.io/tag" + "go.uber.org/zap" ) var ( @@ -71,6 +71,9 @@ type IpfsDHT struct { // ProviderManager stores & manages the provider records for this Dht peer. ProviderManager *providers.ProviderManager + // manages Routing Table refresh + rtRefreshManager *rtrefresh.RtRefreshManager + birth time.Time // When this peer started up Validator record.Validator @@ -104,11 +107,7 @@ type IpfsDHT struct { queryPeerFilter QueryFilterFunc routingTablePeerFilter RouteTableFilterFunc - autoRefresh bool - rtRefreshQueryTimeout time.Duration - rtRefreshInterval time.Duration - triggerRtRefresh chan chan<- error - triggerSelfLookup chan chan<- error + autoRefresh bool // A set of bootstrap peers to fallback on if all other attempts to fix // the routing table fail (or, e.g., this is the first time this node is @@ -122,11 +121,6 @@ type IpfsDHT struct { // networks). enableProviders, enableValues bool - // successfulOutboundQueryGracePeriod is the maximum grace period we will give to a peer - // to between two successful query responses from it, failing which, - // we will ping it to see if it's alive. - successfulOutboundQueryGracePeriod time.Duration - fixLowPeersChan chan struct{} } @@ -156,14 +150,13 @@ func New(ctx context.Context, h host.Host, options ...Option) (*IpfsDHT, error) if err := cfg.validate(); err != nil { return nil, err } + dht, err := makeDHT(ctx, h, cfg) if err != nil { return nil, fmt.Errorf("failed to create DHT, err=%s", err) } dht.autoRefresh = cfg.routingTable.autoRefresh - dht.rtRefreshInterval = cfg.routingTable.refreshInterval - dht.rtRefreshQueryTimeout = cfg.routingTable.refreshQueryTimeout dht.maxRecordAge = cfg.maxRecordAge dht.enableProviders = cfg.enableProviders @@ -196,8 +189,9 @@ func New(ctx context.Context, h host.Host, options ...Option) (*IpfsDHT, error) // handle providers dht.proc.AddChild(dht.ProviderManager.Process()) - dht.startSelfLookup() - dht.startRefreshing() + if err := dht.rtRefreshManager.Start(); err != nil { + return nil, err + } // go-routine to make sure we ALWAYS have RT peer addresses in the peerstore // since RT membership is decoupled from connectivity @@ -266,23 +260,44 @@ func makeDHT(ctx context.Context, h host.Host, cfg config) (*IpfsDHT, error) { bucketSize: cfg.bucketSize, alpha: cfg.concurrency, beta: cfg.resiliency, - triggerRtRefresh: make(chan chan<- error), - triggerSelfLookup: make(chan chan<- error), queryPeerFilter: cfg.queryPeerFilter, routingTablePeerFilter: cfg.routingTable.peerFilter, fixLowPeersChan: make(chan struct{}, 1), } + var maxLastSuccessfulOutboundThreshold time.Duration + + // The threshold is calculated based on the expected amount of time that should pass before we + // query a peer as part of our refresh cycle. + // To grok the Math Wizardy that produced these exact equations, please be patient as a document explaining it will + // be published soon. + if cfg.concurrency < cfg.bucketSize { // (alpha < K) + l1 := math.Log(float64(1) / float64(cfg.bucketSize)) //(Log(1/K)) + l2 := math.Log(float64(1) - (float64(cfg.concurrency) / float64(cfg.bucketSize))) // Log(1 - (alpha / K)) + maxLastSuccessfulOutboundThreshold = time.Duration(l1 / l2 * float64(cfg.routingTable.refreshInterval)) + } else { + maxLastSuccessfulOutboundThreshold = cfg.routingTable.refreshInterval + } + // construct routing table - rt, err := makeRoutingTable(dht, cfg) + rt, err := makeRoutingTable(dht, cfg, maxLastSuccessfulOutboundThreshold) if err != nil { return nil, fmt.Errorf("failed to construct routing table,err=%s", err) } dht.routingTable = rt dht.bootstrapPeers = cfg.bootstrapPeers + // rt refresh manager + rtRefresh, err := makeRtRefreshManager(dht, cfg, maxLastSuccessfulOutboundThreshold) + if err != nil { + return nil, fmt.Errorf("failed to construct RT Refresh Manager,err=%s", err) + } + dht.rtRefreshManager = rtRefresh + // create a DHT proc with the given context - dht.proc = goprocessctx.WithContext(ctx) + dht.proc = goprocessctx.WithContextAndTeardown(ctx, func() error { + return rtRefresh.Close() + }) // create a tagged context derived from the original context ctxTags := dht.newContextWithLocalTags(ctx) @@ -298,19 +313,32 @@ func makeDHT(ctx context.Context, h host.Host, cfg config) (*IpfsDHT, error) { return dht, nil } -func makeRoutingTable(dht *IpfsDHT, cfg config) (*kb.RoutingTable, error) { - // The threshold is calculated based on the expected amount of time that should pass before we - // query a peer as part of our refresh cycle. - // To grok the Math Wizardy that produced these exact equations, please be patient as a document explaining it will - // be published soon. - l1 := math.Log(float64(1) / float64(defaultBucketSize)) //(Log(1/K)) - l2 := math.Log(float64(1) - (float64(cfg.concurrency) / float64(defaultBucketSize))) // Log(1 - (alpha / K)) - maxLastSuccessfulOutboundThreshold := time.Duration(l1 / l2 * float64(cfg.routingTable.refreshInterval)) +func makeRtRefreshManager(dht *IpfsDHT, cfg config, maxLastSuccessfulOutboundThreshold time.Duration) (*rtrefresh.RtRefreshManager, error) { + keyGenFnc := func(cpl uint) (string, error) { + p, err := dht.routingTable.GenRandPeerID(cpl) + return string(p), err + } + queryFnc := func(ctx context.Context, key string) error { + _, err := dht.GetClosestPeers(ctx, key) + return err + } + + r, err := rtrefresh.NewRtRefreshManager( + dht.host, dht.routingTable, cfg.routingTable.autoRefresh, + keyGenFnc, + queryFnc, + cfg.routingTable.refreshQueryTimeout, + cfg.routingTable.refreshInterval, + maxLastSuccessfulOutboundThreshold) + + return r, err +} + +func makeRoutingTable(dht *IpfsDHT, cfg config, maxLastSuccessfulOutboundThreshold time.Duration) (*kb.RoutingTable, error) { self := kb.ConvertPeerID(dht.host.ID()) rt, err := kb.NewRoutingTable(cfg.bucketSize, self, time.Minute, dht.host.Peerstore(), maxLastSuccessfulOutboundThreshold) - dht.successfulOutboundQueryGracePeriod = maxLastSuccessfulOutboundThreshold cmgr := dht.host.ConnManager() rt.PeerAdded = func(p peer.ID) { @@ -397,10 +425,7 @@ func (dht *IpfsDHT) fixLowPeersRoutine(proc goprocess.Process) { } if dht.autoRefresh { - select { - case dht.triggerRtRefresh <- nil: - default: - } + dht.rtRefreshManager.RefreshNoWait() } } @@ -520,8 +545,8 @@ func (dht *IpfsDHT) putLocal(key string, rec *recpb.Record) error { // might support the DHT protocol. // If we have a connection a peer but no exchange of a query RPC -> // LastQueriedAt=time.Now (so we don't ping it for some time for a liveliness check) -// LastUsefulAt=N/A -// If we connect to a peer and exchange a query RPC -> +// LastUsefulAt=0 +// If we connect to a peer and then exchange a query RPC -> // LastQueriedAt=time.Now (same reason as above) // LastUsefulAt=time.Now (so we give it some life in the RT without immediately evicting it) // If we query a peer we already have in our Routing Table -> @@ -542,12 +567,7 @@ func (dht *IpfsDHT) peerFound(ctx context.Context, p peer.ID, queryPeer bool) { // peer not added. return } - - // If we freshly added the peer because of a query, we need to ensure we override the "zero" lastUsefulAt - // value that must have been set in the Routing Table for this peer when it was first added during a connection. - if newlyAdded && queryPeer { - dht.routingTable.UpdateLastUsefulAt(p, time.Now()) - } else if queryPeer { + if !newlyAdded && queryPeer { // the peer is already in our RT, but we just successfully queried it and so let's give it a // bump on the query time so we don't ping it too soon for a liveliness check. dht.routingTable.UpdateLastSuccessfulOutboundQueryAt(p, time.Now()) diff --git a/dht_bootstrap.go b/dht_bootstrap.go index 5ef4e90cac0..536a28c246e 100644 --- a/dht_bootstrap.go +++ b/dht_bootstrap.go @@ -2,14 +2,8 @@ package dht import ( "context" - "fmt" "time" - multierror "github.com/hashicorp/go-multierror" - process "github.com/jbenet/goprocess" - processctx "github.com/jbenet/goprocess/context" - "github.com/libp2p/go-libp2p-core/peer" - kbucket "github.com/libp2p/go-libp2p-kbucket" "github.com/multiformats/go-multiaddr" ) @@ -20,8 +14,6 @@ var DefaultBootstrapPeers []multiaddr.Multiaddr // see a new peer, we trigger a bootstrap round. var minRTRefreshThreshold = 10 -// timeout for pinging one peer -const peerPingTimeout = 10 * time.Second const ( periodicBootstrapInterval = 2 * time.Minute maxNBoostrappers = 2 @@ -43,207 +35,10 @@ func init() { } } -// startSelfLookup starts a go-routine that listens for requests to trigger a self walk on a dedicated channel -// and then sends the error status back on the error channel sent along with the request. -// if multiple callers "simultaneously" ask for a self walk, it performs ONLY one self walk and sends the same error status to all of them. -func (dht *IpfsDHT) startSelfLookup() { - dht.proc.Go(func(proc process.Process) { - ctx := processctx.WithProcessClosing(dht.ctx, proc) - for { - var waiting []chan<- error - select { - case res := <-dht.triggerSelfLookup: - if res != nil { - waiting = append(waiting, res) - } - case <-ctx.Done(): - return - } - - // batch multiple refresh requests if they're all waiting at the same time. - waiting = append(waiting, collectWaitingChannels(dht.triggerSelfLookup)...) - - // Do a self walk - queryCtx, cancel := context.WithTimeout(ctx, dht.rtRefreshQueryTimeout) - _, err := dht.GetClosestPeers(queryCtx, string(dht.self)) - if err == kbucket.ErrLookupFailure { - err = nil - } else if err != nil { - err = fmt.Errorf("failed to query self during routing table refresh: %s", err) - } - cancel() - - // send back the error status - for _, w := range waiting { - w <- err - close(w) - } - if err != nil { - logger.Warnw("self lookup failed", "error", err) - } - } - }) -} - -// Start the refresh worker. -func (dht *IpfsDHT) startRefreshing() { - // scan the RT table periodically & do a random walk for cpl's that haven't been queried since the given period - dht.proc.Go(func(proc process.Process) { - ctx := processctx.WithProcessClosing(dht.ctx, proc) - - refreshTicker := time.NewTicker(dht.rtRefreshInterval) - defer refreshTicker.Stop() - - // refresh if option is set - if dht.autoRefresh { - err := dht.doRefresh(ctx) - if err != nil { - logger.Warn("failed when refreshing routing table", err) - } - } else { - // disable the "auto-refresh" ticker so that no more ticks are sent to this channel - refreshTicker.Stop() - } - - for { - var waiting []chan<- error - select { - case <-refreshTicker.C: - case res := <-dht.triggerRtRefresh: - if res != nil { - waiting = append(waiting, res) - } - case <-ctx.Done(): - return - } - - // Batch multiple refresh requests if they're all waiting at the same time. - waiting = append(waiting, collectWaitingChannels(dht.triggerRtRefresh)...) - - err := dht.doRefresh(ctx) - for _, w := range waiting { - w <- err - close(w) - } - if err != nil { - logger.Warnw("failed when refreshing routing table", "error", err) - } - - // ping Routing Table peers that haven't been hear of/from in the interval they should have been. - for _, ps := range dht.routingTable.GetPeerInfos() { - // ping the peer if it's due for a ping and evict it if the ping fails - if time.Since(ps.LastSuccessfulOutboundQueryAt) > dht.successfulOutboundQueryGracePeriod { - livelinessCtx, cancel := context.WithTimeout(ctx, peerPingTimeout) - if err := dht.host.Connect(livelinessCtx, peer.AddrInfo{ID: ps.Id}); err != nil { - logger.Debugw("evicting peer after failed ping", "peer", ps.Id, "error", err) - dht.routingTable.RemovePeer(ps.Id) - } - cancel() - } - } - - } - }) -} - -func collectWaitingChannels(source chan chan<- error) []chan<- error { - var waiting []chan<- error - for { - select { - case res := <-source: - if res != nil { - waiting = append(waiting, res) - } - default: - return waiting - } - } -} - -func (dht *IpfsDHT) doRefresh(ctx context.Context) error { - var merr error - - // wait for the self walk result - selfWalkres := make(chan error, 1) - - select { - case dht.triggerSelfLookup <- selfWalkres: - case <-ctx.Done(): - return ctx.Err() - } - - select { - case err := <-selfWalkres: - if err != nil { - merr = multierror.Append(merr, err) - } - case <-ctx.Done(): - return ctx.Err() - } - - if err := dht.refreshCpls(ctx); err != nil { - merr = multierror.Append(merr, err) - } - return merr -} - -// refreshCpls scans the routing table, and does a random walk for cpl's that haven't been queried since the given period -func (dht *IpfsDHT) refreshCpls(ctx context.Context) error { - doQuery := func(cpl uint, target string, f func(context.Context) error) error { - logger.Infof("starting refreshing cpl %d to %s (routing table size was %d)", - cpl, target, dht.routingTable.Size()) - defer func() { - logger.Infof("finished refreshing cpl %d to %s (routing table size is now %d)", - cpl, target, dht.routingTable.Size()) - }() - queryCtx, cancel := context.WithTimeout(ctx, dht.rtRefreshQueryTimeout) - defer cancel() - err := f(queryCtx) - if err == context.DeadlineExceeded && queryCtx.Err() == context.DeadlineExceeded && ctx.Err() == nil { - return nil - } - return err - } - - trackedCpls := dht.routingTable.GetTrackedCplsForRefresh() - - var merr error - for cpl, lastRefreshedAt := range trackedCpls { - if time.Since(lastRefreshedAt) <= dht.rtRefreshInterval { - continue - } - - // gen rand peer with the cpl - randPeer, err := dht.routingTable.GenRandPeerID(uint(cpl)) - if err != nil { - logger.Errorw("failed to generate peer ID", "cpl", cpl, "error", err) - continue - } - - // walk to the generated peer - walkFnc := func(c context.Context) error { - _, err := dht.GetClosestPeers(c, string(randPeer)) - return err - } - - if err := doQuery(uint(cpl), randPeer.String(), walkFnc); err != nil { - merr = multierror.Append( - merr, - fmt.Errorf("failed to do a random walk for cpl %d: %w", cpl, err), - ) - } - } - return merr -} - // Bootstrap tells the DHT to get into a bootstrapped state satisfying the // IpfsRouter interface. -func (dht *IpfsDHT) Bootstrap(_ context.Context) error { - // Important: don't block! - select { - case dht.triggerRtRefresh <- nil: - default: - } +func (dht *IpfsDHT) Bootstrap(ctx context.Context) error { + dht.rtRefreshManager.RefreshNoWait() return nil } @@ -252,14 +47,14 @@ func (dht *IpfsDHT) Bootstrap(_ context.Context) error { // The returned channel will block until the refresh finishes, then yield the // error and close. The channel is buffered and safe to ignore. func (dht *IpfsDHT) RefreshRoutingTable() <-chan error { - res := make(chan error, 1) - select { - // FIXME: this can block. Ideally, we'd return a channel without blocking. - // https://github.com/libp2p/go-libp2p-kad-dht/issues/609 - case dht.triggerRtRefresh <- res: - case <-dht.ctx.Done(): - res <- dht.ctx.Err() - close(res) - } - return res + return dht.rtRefreshManager.Refresh(false) +} + +// ForceRefresh acts like RefreshRoutingTable but forces the DHT to refresh all +// buckets in the Routing Table irrespective of when they were last refreshed. +// +// The returned channel will block until the refresh finishes, then yield the +// error and close. The channel is buffered and safe to ignore. +func (dht *IpfsDHT) ForceRefresh() <-chan error { + return dht.rtRefreshManager.Refresh(true) } diff --git a/dht_bootstrap_test.go b/dht_bootstrap_test.go deleted file mode 100644 index a7330c94014..00000000000 --- a/dht_bootstrap_test.go +++ /dev/null @@ -1,49 +0,0 @@ -package dht - -import ( - "context" - "testing" - "time" - - "github.com/libp2p/go-libp2p-core/event" - - kb "github.com/libp2p/go-libp2p-kbucket" - - "github.com/stretchr/testify/require" -) - -func TestSelfWalkOnAddressChange(t *testing.T) { - ctx := context.Background() - // create three DHT instances with auto refresh disabled - d1 := setupDHT(ctx, t, false, DisableAutoRefresh()) - d2 := setupDHT(ctx, t, false, DisableAutoRefresh()) - d3 := setupDHT(ctx, t, false, DisableAutoRefresh()) - - var connectedTo *IpfsDHT - // connect d1 to whoever is "further" - if kb.CommonPrefixLen(kb.ConvertPeerID(d1.self), kb.ConvertPeerID(d2.self)) <= - kb.CommonPrefixLen(kb.ConvertPeerID(d1.self), kb.ConvertPeerID(d3.self)) { - connect(t, ctx, d1, d3) - connectedTo = d3 - } else { - connect(t, ctx, d1, d2) - connectedTo = d2 - } - - // then connect d2 AND d3 - connect(t, ctx, d2, d3) - - // d1 should have ONLY 1 peer in it's RT - waitForWellFormedTables(t, []*IpfsDHT{d1}, 1, 1, 2*time.Second) - require.Equal(t, connectedTo.self, d1.routingTable.ListPeers()[0]) - - // now emit the address change event - em, err := d1.host.EventBus().Emitter(&event.EvtLocalAddressesUpdated{}) - require.NoError(t, err) - require.NoError(t, em.Emit(event.EvtLocalAddressesUpdated{})) - waitForWellFormedTables(t, []*IpfsDHT{d1}, 2, 2, 2*time.Second) - // it should now have both peers in the RT - ps := d1.routingTable.ListPeers() - require.Contains(t, ps, d2.self) - require.Contains(t, ps, d3.self) -} diff --git a/dht_test.go b/dht_test.go index 662189a5ad7..0fa80164d09 100644 --- a/dht_test.go +++ b/dht_test.go @@ -18,24 +18,23 @@ import ( "github.com/libp2p/go-libp2p-core/peer" "github.com/libp2p/go-libp2p-core/peerstore" "github.com/libp2p/go-libp2p-core/routing" - "github.com/multiformats/go-multihash" - "github.com/multiformats/go-multistream" - - "github.com/stretchr/testify/assert" - "github.com/stretchr/testify/require" test "github.com/libp2p/go-libp2p-kad-dht/internal/testing" pb "github.com/libp2p/go-libp2p-kad-dht/pb" - - "github.com/ipfs/go-cid" - u "github.com/ipfs/go-ipfs-util" kb "github.com/libp2p/go-libp2p-kbucket" record "github.com/libp2p/go-libp2p-record" swarmt "github.com/libp2p/go-libp2p-swarm/testing" bhost "github.com/libp2p/go-libp2p/p2p/host/basic" - ma "github.com/multiformats/go-multiaddr" + "github.com/ipfs/go-cid" detectrace "github.com/ipfs/go-detect-race" + u "github.com/ipfs/go-ipfs-util" + ma "github.com/multiformats/go-multiaddr" + "github.com/multiformats/go-multihash" + "github.com/multiformats/go-multistream" + + "github.com/stretchr/testify/assert" + "github.com/stretchr/testify/require" ) var testCaseCids []cid.Cid @@ -831,6 +830,35 @@ func TestRefreshBelowMinRTThreshold(t *testing.T) { assert.Equal(t, dhtE.self, dhtA.routingTable.Find(dhtE.self), "A's routing table should have peer E!") } +func TestQueryWithEmptyRTShouldNotPanic(t *testing.T) { + ctx := context.Background() + d := setupDHT(ctx, t, false) + + // TODO This swallows the error for now, should we change it ? + // FindProviders + ps, _ := d.FindProviders(ctx, testCaseCids[0]) + require.Empty(t, ps) + + // GetClosestPeers + pc, err := d.GetClosestPeers(ctx, "key") + require.Nil(t, pc) + require.Equal(t, kb.ErrLookupFailure, err) + + // GetValue + best, err := d.GetValue(ctx, "key") + require.Empty(t, best) + require.Error(t, err) + + // SearchValue + bchan, err := d.SearchValue(ctx, "key") + require.Empty(t, bchan) + require.NoError(t, err) + + // Provide + err = d.Provide(ctx, testCaseCids[0], true) + require.Equal(t, kb.ErrLookupFailure, err) +} + func TestPeriodicRefresh(t *testing.T) { if testing.Short() { t.SkipNow() diff --git a/go.sum b/go.sum index eb5e8332771..e5756a88762 100644 --- a/go.sum +++ b/go.sum @@ -1,29 +1,13 @@ cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= -cloud.google.com/go v0.31.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= -cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= -cloud.google.com/go v0.37.0/go.mod h1:TS1dMSSfndXH133OKGwekG838Om/cQT0BUHV3HcBgoo= -dmitri.shuralyov.com/app/changes v0.0.0-20180602232624-0a106ad413e3/go.mod h1:Yl+fi1br7+Rr3LqpNJf1/uxUdtRUV+Tnj0o93V2B9MU= -dmitri.shuralyov.com/html/belt v0.0.0-20180602232347-f7d459c86be0/go.mod h1:JLBrvjyP0v+ecvNYvCpyZgu5/xkfAUhi6wJj28eUfSU= -dmitri.shuralyov.com/service/change v0.0.0-20181023043359-a85b471d5412/go.mod h1:a1inKt/atXimZ4Mv927x+r7UpyzRUf4emIoiiSC2TN4= -dmitri.shuralyov.com/state v0.0.0-20180228185332-28bcc343414c/go.mod h1:0PRwlb0D6DFvNNtx+9ybjezNCa8XF0xaYcETyp6rHWU= -git.apache.org/thrift.git v0.0.0-20180902110319-2566ecd5d999/go.mod h1:fPE2ZNJGynbRyZ4dJvy6G277gSllfV2HJqblrnkyeyg= github.com/AndreasBriese/bbloom v0.0.0-20180913140656-343706a395b7/go.mod h1:bOvUY6CB00SOBii9/FifXqc0awNKxLFCL/+pkDPuyl8= github.com/AndreasBriese/bbloom v0.0.0-20190306092124-e2d15f34fcf9/go.mod h1:bOvUY6CB00SOBii9/FifXqc0awNKxLFCL/+pkDPuyl8= -github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ= github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= github.com/Kubuxu/go-os-helper v0.0.1/go.mod h1:N8B+I7vPCT80IcP58r50u4+gEEcsZETFUpAzWW2ep1Y= github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU= github.com/aead/siphash v1.0.1/go.mod h1:Nywa3cDsYNNK3gaciGTWPwHt0wlpNV15vwmswBAUSII= -github.com/alangpierce/go-forceexport v0.0.0-20160317203124-8f1d6941cd75/go.mod h1:uAXEEpARkRhCZfEvy/y0Jcc888f9tHCc1W7/UeEtreE= 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@@ -0,0 +1,294 @@ +package rtrefresh + +import ( + "context" + "fmt" + "sync" + "time" + + "github.com/libp2p/go-libp2p-core/host" + "github.com/libp2p/go-libp2p-core/peer" + + kbucket "github.com/libp2p/go-libp2p-kbucket" + + "github.com/hashicorp/go-multierror" + logging "github.com/ipfs/go-log" +) + +var logger = logging.Logger("dht/RtRefreshManager") + +const ( + peerPingTimeout = 10 * time.Second +) + +type triggerRefreshReq struct { + respCh chan error + forceCplRefresh bool +} + +type RtRefreshManager struct { + ctx context.Context + cancel context.CancelFunc + refcount sync.WaitGroup + closeOnce sync.Once + + // peerId of this DHT peer i.e. self peerId. + h host.Host + dhtPeerId peer.ID + rt *kbucket.RoutingTable + + enableAutoRefresh bool // should run periodic refreshes ? + refreshKeyGenFnc func(cpl uint) (string, error) // generate the key for the query to refresh this cpl + refreshQueryFnc func(ctx context.Context, key string) error // query to run for a refresh. + refreshQueryTimeout time.Duration // timeout for one refresh query + + // interval between two periodic refreshes. + // also, a cpl wont be refreshed if the time since it was last refreshed + // is below the interval..unless a "forced" refresh is done. + refreshInterval time.Duration + successfulOutboundQueryGracePeriod time.Duration + + triggerRefresh chan *triggerRefreshReq // channel to write refresh requests to. +} + +func NewRtRefreshManager(h host.Host, rt *kbucket.RoutingTable, autoRefresh bool, + refreshKeyGenFnc func(cpl uint) (string, error), + refreshQueryFnc func(ctx context.Context, key string) error, + refreshQueryTimeout time.Duration, + refreshInterval time.Duration, + successfulOutboundQueryGracePeriod time.Duration) (*RtRefreshManager, error) { + + ctx, cancel := context.WithCancel(context.Background()) + return &RtRefreshManager{ + ctx: ctx, + cancel: cancel, + h: h, + dhtPeerId: h.ID(), + rt: rt, + + enableAutoRefresh: autoRefresh, + refreshKeyGenFnc: refreshKeyGenFnc, + refreshQueryFnc: refreshQueryFnc, + + refreshQueryTimeout: refreshQueryTimeout, + refreshInterval: refreshInterval, + successfulOutboundQueryGracePeriod: successfulOutboundQueryGracePeriod, + + triggerRefresh: make(chan *triggerRefreshReq), + }, nil +} + +func (r *RtRefreshManager) Start() error { + r.refcount.Add(1) + go r.loop() + return nil +} + +func (r *RtRefreshManager) Close() error { + r.closeOnce.Do(func() { + r.cancel() + r.refcount.Wait() + }) + return nil +} + +// RefreshRoutingTable requests the refresh manager to refresh the Routing Table. +// If the force parameter is set to true true, all buckets will be refreshed irrespective of when they were last refreshed. +// +// The returned channel will block until the refresh finishes, then yield the +// error and close. The channel is buffered and safe to ignore. +// FIXME: this can block. Ideally, we'd return a channel without blocking. +// https://github.com/libp2p/go-libp2p-kad-dht/issues/609 +func (r *RtRefreshManager) Refresh(force bool) <-chan error { + resp := make(chan error, 1) + select { + case r.triggerRefresh <- &triggerRefreshReq{respCh: resp, forceCplRefresh: force}: + case <-r.ctx.Done(): + resp <- r.ctx.Err() + } + return resp +} + +// RefreshNoWait requests the refresh manager to refresh the Routing Table. +// However, it moves on without blocking if it's request can't get through. +func (r *RtRefreshManager) RefreshNoWait() { + select { + case r.triggerRefresh <- &triggerRefreshReq{}: + default: + } +} + +func (r *RtRefreshManager) loop() { + defer r.refcount.Done() + + var refreshTickrCh <-chan time.Time + if r.enableAutoRefresh { + err := r.doRefresh(true) + if err != nil { + logger.Warn("failed when refreshing routing table", err) + } + t := time.NewTicker(r.refreshInterval) + defer t.Stop() + refreshTickrCh = t.C + } + + for { + var waiting []chan<- error + var forced bool + select { + case <-refreshTickrCh: + case triggerRefreshReq := <-r.triggerRefresh: + if triggerRefreshReq.respCh != nil { + waiting = append(waiting, triggerRefreshReq.respCh) + } + forced = forced || triggerRefreshReq.forceCplRefresh + case <-r.ctx.Done(): + return + } + + // Batch multiple refresh requests if they're all waiting at the same time. + OuterLoop: + for { + select { + case triggerRefreshReq := <-r.triggerRefresh: + if triggerRefreshReq.respCh != nil { + waiting = append(waiting, triggerRefreshReq.respCh) + } + forced = forced || triggerRefreshReq.forceCplRefresh + default: + break OuterLoop + } + } + + // EXECUTE the refresh + + // ping Routing Table peers that haven't been heard of/from in the interval they should have been. + // and evict them if they don't reply. + var wg sync.WaitGroup + for _, ps := range r.rt.GetPeerInfos() { + if time.Since(ps.LastSuccessfulOutboundQueryAt) > r.successfulOutboundQueryGracePeriod { + wg.Add(1) + go func(ps kbucket.PeerInfo) { + defer wg.Done() + livelinessCtx, cancel := context.WithTimeout(r.ctx, peerPingTimeout) + if err := r.h.Connect(livelinessCtx, peer.AddrInfo{ID: ps.Id}); err != nil { + logger.Debugw("evicting peer after failed ping", "peer", ps.Id, "error", err) + r.rt.RemovePeer(ps.Id) + } + cancel() + }(ps) + } + } + wg.Wait() + + // Query for self and refresh the required buckets + err := r.doRefresh(forced) + for _, w := range waiting { + w <- err + close(w) + } + if err != nil { + logger.Warnw("failed when refreshing routing table", "error", err) + } + } +} + +func (r *RtRefreshManager) doRefresh(forceRefresh bool) error { + var merr error + + if err := r.queryForSelf(); err != nil { + merr = multierror.Append(merr, err) + } + + refreshCpls := r.rt.GetTrackedCplsForRefresh() + + rfnc := func(cpl uint) (err error) { + if forceRefresh { + err = r.refreshCpl(cpl) + } else { + err = r.refreshCplIfEligible(cpl, refreshCpls[cpl]) + } + return + } + + for c := range refreshCpls { + cpl := uint(c) + if err := rfnc(cpl); err != nil { + merr = multierror.Append(merr, err) + } else { + // If we see a gap at a Cpl in the Routing table, we ONLY refresh up until the maximum cpl we + // have in the Routing Table OR (2 * (Cpl+ 1) with the gap), whichever is smaller. + // This is to prevent refreshes for Cpls that have no peers in the network but happen to be before a very high max Cpl + // for which we do have peers in the network. + // The number of 2 * (Cpl + 1) can be proved and a proof would have been written here if the programmer + // had paid more attention in the Math classes at university. + // So, please be patient and a doc explaining it will be published soon. + if r.rt.NPeersForCpl(cpl) == 0 { + lastCpl := min(2*(c+1), len(refreshCpls)-1) + for i := c + 1; i < lastCpl+1; i++ { + if err := rfnc(uint(i)); err != nil { + merr = multierror.Append(merr, err) + } + } + return merr + } + } + } + + return merr +} + +func min(a int, b int) int { + if a <= b { + return a + } + + return b +} + +func (r *RtRefreshManager) refreshCplIfEligible(cpl uint, lastRefreshedAt time.Time) error { + if time.Since(lastRefreshedAt) <= r.refreshInterval { + logger.Debugf("not running refresh for cpl %d as time since last refresh not above interval", cpl) + return nil + } + + return r.refreshCpl(cpl) +} + +func (r *RtRefreshManager) refreshCpl(cpl uint) error { + // gen a key for the query to refresh the cpl + key, err := r.refreshKeyGenFnc(cpl) + if err != nil { + return fmt.Errorf("failed to generated query key for cpl=%d, err=%s", cpl, err) + } + + logger.Infof("starting refreshing cpl %d with key %s (routing table size was %d)", + cpl, key, r.rt.Size()) + + if err := r.runRefreshDHTQuery(key); err != nil { + return fmt.Errorf("failed to refresh cpl=%d, err=%s", cpl, err) + } + + logger.Infof("finished refreshing cpl %d, routing table size is now %d", cpl, r.rt.Size()) + return nil +} + +func (r *RtRefreshManager) queryForSelf() error { + if err := r.runRefreshDHTQuery(string(r.dhtPeerId)); err != nil { + return fmt.Errorf("failed to query for self, err=%s", err) + } + return nil +} + +func (r *RtRefreshManager) runRefreshDHTQuery(key string) error { + queryCtx, cancel := context.WithTimeout(r.ctx, r.refreshQueryTimeout) + defer cancel() + + err := r.refreshQueryFnc(queryCtx, key) + + if err == nil || (err == context.DeadlineExceeded && queryCtx.Err() == context.DeadlineExceeded) { + return nil + } + + return fmt.Errorf("failed to run refresh DHT query for key=%s, err=%s", key, err) +} diff --git a/rtrefresh/rt_refresh_manager_test.go b/rtrefresh/rt_refresh_manager_test.go new file mode 100644 index 00000000000..d384aa4327d --- /dev/null +++ b/rtrefresh/rt_refresh_manager_test.go @@ -0,0 +1,100 @@ +package rtrefresh + +import ( + "context" + "strconv" + "testing" + "time" + + "github.com/libp2p/go-libp2p-core/test" + + kb "github.com/libp2p/go-libp2p-kbucket" + pstore "github.com/libp2p/go-libp2p-peerstore" + + "github.com/stretchr/testify/require" +) + +func TestSkipRefreshOnGapCpls(t *testing.T) { + ctx, cancel := context.WithCancel(context.Background()) + defer cancel() + local := test.RandPeerIDFatal(t) + + // adds a peer for a cpl. + // The "ignoreCpl" is the cpl for which we assume we have no peers in the network. + // So. if the query function gets a "key" which is basically tha stringed version of the "ignoreCpl", + // we return without adding any peers for it to the Routing Table. + qFuncWithIgnore := func(rt *kb.RoutingTable, ignoreCpl uint) func(c context.Context, key string) error { + return func(c context.Context, key string) error { + if key == string(local) { + return nil + } + + u, err := strconv.ParseInt(key, 10, 64) + require.NoError(t, err) + + if uint(u) == ignoreCpl { + return nil + } + + p, err := rt.GenRandPeerID(uint(u)) + require.NoError(t, err) + b, err := rt.TryAddPeer(p, true) + require.True(t, b) + require.NoError(t, err) + return nil + } + } + + // We use the cpl as the key for the query. So, the cpl -> key transformation function + // basically just converts the uint cpl to a string key using the strconv lib. + kfnc := func(cpl uint) (string, error) { + return strconv.FormatInt(int64(cpl), 10), nil + } + + // when 2*gapcpl < maxCpl + // gap is 2 and max is 10 + rt, err := kb.NewRoutingTable(2, kb.ConvertPeerID(local), time.Hour, pstore.NewMetrics(), 100*time.Hour) + require.NoError(t, err) + r := &RtRefreshManager{ctx: ctx, rt: rt, refreshKeyGenFnc: kfnc, dhtPeerId: local} + icpl := uint(2) + lastCpl := 2 * (icpl + 1) + p, err := rt.GenRandPeerID(10) + require.NoError(t, err) + b, _ := rt.TryAddPeer(p, true) + require.True(t, b) + r.refreshQueryFnc = qFuncWithIgnore(rt, icpl) + require.NoError(t, r.doRefresh(true)) + + for i := uint(0); i < lastCpl+1; i++ { + if i == icpl { + require.Equal(t, 0, rt.NPeersForCpl(i)) + continue + } + require.Equal(t, 1, rt.NPeersForCpl(uint(i))) + } + for i := lastCpl + 1; i < 10; i++ { + require.Equal(t, 0, rt.NPeersForCpl(i)) + } + + // when 2 * (gapcpl + 1) > maxCpl + rt, err = kb.NewRoutingTable(2, kb.ConvertPeerID(local), time.Hour, pstore.NewMetrics(), 100*time.Hour) + require.NoError(t, err) + r = &RtRefreshManager{ctx: ctx, rt: rt, refreshKeyGenFnc: kfnc, dhtPeerId: local} + icpl = uint(6) + p, err = rt.GenRandPeerID(10) + require.NoError(t, err) + b, _ = rt.TryAddPeer(p, true) + require.True(t, b) + r.refreshQueryFnc = qFuncWithIgnore(rt, icpl) + require.NoError(t, r.doRefresh(true)) + + for i := uint(0); i < 10; i++ { + if i == icpl { + require.Equal(t, 0, rt.NPeersForCpl(i)) + continue + } + + require.Equal(t, 1, rt.NPeersForCpl(uint(i))) + } + require.Equal(t, 2, rt.NPeersForCpl(10)) +} diff --git a/subscriber_notifee.go b/subscriber_notifee.go index 828b75b1cba..6b79cbbd294 100644 --- a/subscriber_notifee.go +++ b/subscriber_notifee.go @@ -85,10 +85,7 @@ func (nn *subscriberNotifee) subscribe(proc goprocess.Process) { // with our new address to all peers we are connected to. However, we might not necessarily be connected // to our closet peers & so in the true spirit of Zen, searching for ourself in the network really is the best way // to to forge connections with those matter. - select { - case dht.triggerSelfLookup <- nil: - default: - } + dht.rtRefreshManager.RefreshNoWait() case event.EvtPeerProtocolsUpdated: handlePeerChangeEvent(dht, evt.Peer) case event.EvtPeerIdentificationCompleted: