Merge pull request #86 from renproject/feat/add-peer-expiry

Peer expiry

channel/client.go

@@ -36,7 +36,7 @@ type sharedChannel struct {
 
 type Msg struct {
 	wire.Packet
-	From   id.Signatory
+	From id.Signatory
 }
 
 type Client struct {

dht/table.go

@@ -13,6 +13,11 @@ import (
 // Force InMemTable to implement the Table interface.
 var _ Table = &InMemTable{}
 
+type Expiry struct {
+	minimumExpiryAge time.Duration
+	timestamp        time.Time
+}
+
 // A Table is responsible for keeping tack of peers, their network addresses,
 // and the subnet to which they belong.
 type Table interface {
@@ -38,6 +43,15 @@ type Table interface {
 	// addresses in the table.
 	NumPeers() int
 
+	// HandleExpired returns whether a signatory has expired. It checks whether
+	// an Expiry exists for the signatory, and if it does, has it expired?
+	// If found expired, it deletes the peer from the table
+	HandleExpired(id.Signatory) bool
+	// AddExpiry to the table with given duration if no existing expiry is found
+	AddExpiry(id.Signatory, time.Duration)
+	// DeleteExpiry from the table
+	DeleteExpiry(id.Signatory)
+
 	// AddSubnet to the table. This returns a subnet hash that can be used to
 	// read/delete the subnet. It is the merkle root hash of the peers in the
 	// subnet.
@@ -59,8 +73,8 @@ type InMemTable struct {
 	addrsBySignatoryMu *sync.Mutex
 	addrsBySignatory   map[id.Signatory]wire.Address
 
-	ipBySignatoryMu *sync.Mutex
-	ipBySignatory   map[id.Signatory]string
+	expiryBySignatoryMu *sync.Mutex
+	expiryBySignatory   map[id.Signatory]Expiry
 
 	subnetsByHashMu *sync.Mutex
 	subnetsByHash   map[id.Hash][]id.Signatory
@@ -78,8 +92,8 @@ func NewInMemTable(self id.Signatory) *InMemTable {
 		addrsBySignatoryMu: new(sync.Mutex),
 		addrsBySignatory:   map[id.Signatory]wire.Address{},
 
-		ipBySignatoryMu: new(sync.Mutex),
-		ipBySignatory:   map[id.Signatory]string{},
+		expiryBySignatoryMu: new(sync.Mutex),
+		expiryBySignatory:   map[id.Signatory]Expiry{},
 
 		subnetsByHashMu: new(sync.Mutex),
 		subnetsByHash:   map[id.Hash][]id.Signatory{},
@@ -227,6 +241,44 @@ func (table *InMemTable) NumPeers() int {
 	return len(table.addrsBySignatory)
 }
 
+func (table *InMemTable) HandleExpired(peerID id.Signatory) bool {
+	table.expiryBySignatoryMu.Lock()
+	defer table.expiryBySignatoryMu.Unlock()
+	expiry, ok := table.expiryBySignatory[peerID]
+	if !ok {
+		return false
+	}
+	expired := (time.Now().Sub(expiry.timestamp)) > expiry.minimumExpiryAge
+	if expired {
+		table.DeletePeer(peerID)
+		delete(table.expiryBySignatory, peerID)
+	}
+	return expired
+}
+
+func (table *InMemTable) AddExpiry(peerID id.Signatory, duration time.Duration) {
+	table.expiryBySignatoryMu.Lock()
+	defer table.expiryBySignatoryMu.Unlock()
+	_, ok := table.PeerAddress(peerID)
+	if !ok {
+		return
+	}
+	_, ok = table.expiryBySignatory[peerID]
+	if ok {
+		return
+	}
+	table.expiryBySignatory[peerID] = Expiry{
+		minimumExpiryAge: duration,
+		timestamp:        time.Now(),
+	}
+}
+
+func (table *InMemTable) DeleteExpiry(peerID id.Signatory) {
+	table.expiryBySignatoryMu.Lock()
+	defer table.expiryBySignatoryMu.Unlock()
+	delete(table.expiryBySignatory, peerID)
+}
+
 func (table *InMemTable) AddSubnet(signatories []id.Signatory) id.Hash {
 	copied := make([]id.Signatory, len(signatories))
 	copy(copied, signatories)

go.mod

@@ -4,7 +4,7 @@ go 1.12
 
 require (
 	github.com/ethereum/go-ethereum v1.9.10
-	github.com/onsi/ginkgo v1.14.0
+	github.com/onsi/ginkgo v1.16.4
 	github.com/onsi/gomega v1.10.1
 	github.com/renproject/id v0.4.2
 	github.com/renproject/pack v0.2.5

go.sum

@@ -102,6 +102,8 @@ github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V
 github.com/go-ole/go-ole v1.2.1/go.mod h1:7FAglXiTm7HKlQRDeOQ6ZNUHidzCWXuZWq/1dTyBNF8=
 github.com/go-stack/stack v1.8.0 h1:5SgMzNM5HxrEjV0ww2lTmX6E2Izsfxas4+YHWRs3Lsk=
 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
+github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0 h1:p104kn46Q8WdvHunIJ9dAyjPVtrBPhSr3KT2yUst43I=
+github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0/go.mod h1:fyg7847qk6SyHyPtNmDHnmrv/HOrqktSC+C9fM+CJOE=
 github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
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@@ -183,6 +185,8 @@ github.com/naoina/go-stringutil v0.1.0/go.mod h1:XJ2SJL9jCtBh+P9q5btrd/Ylo8XwT/h
 github.com/naoina/toml v0.1.2-0.20170918210437-9fafd6967416/go.mod h1:NBIhNtsFMo3G2szEBne+bO4gS192HuIYRqfvOWb4i1E=
 github.com/nxadm/tail v1.4.4 h1:DQuhQpB1tVlglWS2hLQ5OV6B5r8aGxSrPc5Qo6uTN78=
 github.com/nxadm/tail v1.4.4/go.mod h1:kenIhsEOeOJmVchQTgglprH7qJGnHDVpk1VPCcaMI8A=
+github.com/nxadm/tail v1.4.8 h1:nPr65rt6Y5JFSKQO7qToXr7pePgD6Gwiw05lkbyAQTE=
+github.com/nxadm/tail v1.4.8/go.mod h1:+ncqLTQzXmGhMZNUePPaPqPvBxHAIsmXswZKocGu+AU=
 github.com/oklog/ulid v1.3.1/go.mod h1:CirwcVhetQ6Lv90oh/F+FBtV6XMibvdAFo93nm5qn4U=
 github.com/olekukonko/tablewriter v0.0.1/go.mod h1:vsDQFd/mU46D+Z4whnwzcISnGGzXWMclvtLoiIKAKIo=
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@@ -199,6 +203,8 @@ github.com/onsi/ginkgo v1.12.3/go.mod h1:iSB4RoI2tjJc9BBv4NKIKWKya62Rps+oPG/Lv9k
 github.com/onsi/ginkgo v1.14.0 h1:2mOpI4JVVPBN+WQRa0WKH2eXR+Ey+uK4n7Zj0aYpIQA=
 github.com/onsi/ginkgo v1.14.0/go.mod h1:iSB4RoI2tjJc9BBv4NKIKWKya62Rps+oPG/Lv9klQyY=
 github.com/onsi/ginkgo v1.14.2 h1:8mVmC9kjFFmA8H4pKMUhcblgifdkOIXPvbhN1T36q1M=
+github.com/onsi/ginkgo v1.16.4 h1:29JGrr5oVBm5ulCWet69zQkzWipVXIol6ygQUe/EzNc=
+github.com/onsi/ginkgo v1.16.4/go.mod h1:dX+/inL/fNMqNlz0e9LfyB9TswhZpCVdJM/Z6Vvnwo0=
 github.com/onsi/gomega v1.4.3/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
 github.com/onsi/gomega v1.5.0/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
 github.com/onsi/gomega v1.7.0/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
@@ -296,6 +302,7 @@ github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXf
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
 github.com/syndtr/goleveldb v1.0.1-0.20190318030020-c3a204f8e965/go.mod h1:9OrXJhf154huy1nPWmuSrkgjPUtUNhA+Zmy+6AESzuA=
 github.com/syndtr/goleveldb v1.0.1-0.20190923125748-758128399b1d h1:gZZadD8H+fF+n9CmNhYL1Y0dJB+kLOmKd7FbPJLeGHs=
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@@ -311,6 +318,7 @@ github.com/xdg/stringprep v1.0.0/go.mod h1:Jhud4/sHMO4oL310DaZAKk9ZaJ08SJfe+sJh0
 github.com/xordataexchange/crypt v0.0.3-0.20170626215501-b2862e3d0a77/go.mod h1:aYKd//L2LvnjZzWKhF00oedf4jCCReLcmhLdhm1A27Q=
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+github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
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@@ -334,13 +342,17 @@ golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586 h1:7KByu05hhLed2MO29w7p1X
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 golang.org/x/crypto v0.0.0-20200115085410-6d4e4cb37c7d h1:2+ZP7EfsZV7Vvmx3TIqSlSzATMkTAKqM14YGFPoSKjI=
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@@ -355,11 +367,14 @@ golang.org/x/net v0.0.0-20190912160710-24e19bdeb0f2 h1:4dVFTC832rPn4pomLSz1vA+ar
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 golang.org/x/net v0.0.0-20200520004742-59133d7f0dd7/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
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@@ -383,9 +398,14 @@ golang.org/x/sys v0.0.0-20191120155948-bd437916bb0e/go.mod h1:h1NjWce9XRLGQEsW7w
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@@ -396,10 +416,16 @@ golang.org/x/tools v0.0.0-20190621195816-6e04913cbbac/go.mod h1:/rFqwRUd4F7ZHNgw
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+golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
+golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
 google.golang.org/grpc v1.23.1/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=

peer/peer.go

@@ -103,7 +103,7 @@ func (p *Peer) Run(ctx context.Context) {
 	p.transport.Run(ctx)
 }
 
-func (p *Peer) Receive(ctx context.Context, f func(id.Signatory,wire.Packet) error) {
+func (p *Peer) Receive(ctx context.Context, f func(id.Signatory, wire.Packet) error) {
 	p.transport.Receive(ctx, f)
 }
 

transport/transport.go

@@ -29,6 +29,7 @@ var (
 	DefaultDialTimeout   = policy.ConstantTimeout(time.Second)
 	DefaultClientTimeout = 10 * time.Second
 	DefaultServerTimeout = 10 * time.Second
+	DefaultExpiryTimeout = time.Minute
 )
 
 // Options used to parameterise the behaviour of a Transport.
@@ -42,6 +43,7 @@ type Options struct {
 	ClientTimeout   time.Duration
 	ServerTimeout   time.Duration
 	OncePoolOptions handshake.OncePoolOptions
+	ExpiryDuration  time.Duration
 }
 
 // DefaultOptions returns Options with sensible defaults.
@@ -60,6 +62,7 @@ func DefaultOptions() Options {
 		ClientTimeout:   DefaultClientTimeout,
 		ServerTimeout:   DefaultServerTimeout,
 		OncePoolOptions: handshake.DefaultOncePoolOptions(),
+		ExpiryDuration:  DefaultExpiryTimeout,
 	}
 }
 
@@ -93,6 +96,11 @@ func (opts Options) WithOncePoolOptions(oncePoolOpts handshake.OncePoolOptions)
 	return opts
 }
 
+func (opts Options) WithExpiry(minimumDuration time.Duration) Options {
+	opts.ExpiryDuration = minimumDuration
+	return opts
+}
+
 type Transport struct {
 	opts Options
 
@@ -243,7 +251,6 @@ func (t *Transport) run(ctx context.Context) {
 			enc = codec.LengthPrefixEncoder(codec.PlainEncoder, enc)
 			dec = codec.LengthPrefixDecoder(codec.PlainDecoder, dec)
 
-
 			// If the Transport is linked to the remote peer, then the
 			// network connection should be kept alive until the remote peer
 			// is unlinked (or the network connection faults).
@@ -301,6 +308,7 @@ func (t *Transport) dial(retryCtx context.Context, remote id.Signatory, remoteAd
 		return
 	}
 
+	exit := make(chan struct{})
 	for {
 		dialCtx, cancel := context.WithTimeout(context.Background(), t.opts.ClientTimeout)
 
@@ -348,12 +356,20 @@ func (t *Transport) dial(retryCtx context.Context, remote id.Signatory, remoteAd
 				}
 			},
 			func(err error) {
-				t.opts.Logger.Error("dial", zap.String("remote", remote.String()), zap.String("addr", remoteAddr.String()), zap.Error(err))
+				t.opts.Logger.Debug("dial", zap.String("remote", remote.String()), zap.String("addr", remoteAddr.String()), zap.Error(err))
+				t.table.AddExpiry(remote, t.opts.ExpiryDuration)
+				if t.table.HandleExpired(remote) {
+					t.Unlink(remote)
+					close(exit)
+					cancel()
+				}
 			},
 			t.opts.DialTimeout)
 		if err != nil {
-			t.opts.Logger.Error("dial", zap.String("remote", remote.String()), zap.String("addr", remoteAddr.String()), zap.Error(err))
+			t.opts.Logger.Debug("dial", zap.String("remote", remote.String()), zap.String("addr", remoteAddr.String()), zap.Error(err))
 			select {
+			case <-exit:
+				break
 			case <-retryCtx.Done():
 			case <-dialCtx.Done():
 				if !t.IsConnected(remote) {
@@ -362,6 +378,12 @@ func (t *Transport) dial(retryCtx context.Context, remote id.Signatory, remoteAd
 					continue
 				}
 			}
+		} else {
+			t.table.DeleteExpiry(remote)
+		}
+
+		if !t.IsConnected(remote) {
+			t.opts.Logger.Error("dial", zap.String("remote", remote.String()), zap.String("addr", remoteAddr.String()), zap.Error(fmt.Errorf("failed to connect")))
 		}
 		// Cancel last dial context before exiting
 		cancel()