Merge pull request #1105 from tendermint/p2p-switch

cleanup switch

benchmarks/codec_test.go

@@ -16,11 +16,10 @@ func BenchmarkEncodeStatusWire(b *testing.B) {
 	b.StopTimer()
 	pubKey := crypto.GenPrivKeyEd25519().PubKey()
 	status := &ctypes.ResultStatus{
-		NodeInfo: &p2p.NodeInfo{
+		NodeInfo: p2p.NodeInfo{
 			PubKey:     pubKey,
 			Moniker:    "SOMENAME",
 			Network:    "SOMENAME",
-			RemoteAddr: "SOMEADDR",
 			ListenAddr: "SOMEADDR",
 			Version:    "SOMEVER",
 			Other:      []string{"SOMESTRING", "OTHERSTRING"},
@@ -43,11 +42,10 @@ func BenchmarkEncodeStatusWire(b *testing.B) {
 func BenchmarkEncodeNodeInfoWire(b *testing.B) {
 	b.StopTimer()
 	pubKey := crypto.GenPrivKeyEd25519().PubKey()
-	nodeInfo := &p2p.NodeInfo{
+	nodeInfo := p2p.NodeInfo{
 		PubKey:     pubKey,
 		Moniker:    "SOMENAME",
 		Network:    "SOMENAME",
-		RemoteAddr: "SOMEADDR",
 		ListenAddr: "SOMEADDR",
 		Version:    "SOMEVER",
 		Other:      []string{"SOMESTRING", "OTHERSTRING"},
@@ -64,11 +62,10 @@ func BenchmarkEncodeNodeInfoWire(b *testing.B) {
 func BenchmarkEncodeNodeInfoBinary(b *testing.B) {
 	b.StopTimer()
 	pubKey := crypto.GenPrivKeyEd25519().PubKey()
-	nodeInfo := &p2p.NodeInfo{
+	nodeInfo := p2p.NodeInfo{
 		PubKey:     pubKey,
 		Moniker:    "SOMENAME",
 		Network:    "SOMENAME",
-		RemoteAddr: "SOMEADDR",
 		ListenAddr: "SOMEADDR",
 		Version:    "SOMEVER",
 		Other:      []string{"SOMESTRING", "OTHERSTRING"},
@@ -87,11 +84,10 @@ func BenchmarkEncodeNodeInfoProto(b *testing.B) {
 	b.StopTimer()
 	pubKey := crypto.GenPrivKeyEd25519().PubKey().Unwrap().(crypto.PubKeyEd25519)
 	pubKey2 := &proto.PubKey{Ed25519: &proto.PubKeyEd25519{Bytes: pubKey[:]}}
-	nodeInfo := &proto.NodeInfo{
+	nodeInfo := proto.NodeInfo{
 		PubKey:     pubKey2,
 		Moniker:    "SOMENAME",
 		Network:    "SOMENAME",
-		RemoteAddr: "SOMEADDR",
 		ListenAddr: "SOMEADDR",
 		Version:    "SOMEVER",
 		Other:      []string{"SOMESTRING", "OTHERSTRING"},

blockchain/reactor_test.go

@@ -142,7 +142,7 @@ func (tp *bcrTestPeer) TrySend(chID byte, value interface{}) bool {
 }
 
 func (tp *bcrTestPeer) Send(chID byte, data interface{}) bool { return tp.TrySend(chID, data) }
-func (tp *bcrTestPeer) NodeInfo() *p2p.NodeInfo               { return nil }
+func (tp *bcrTestPeer) NodeInfo() p2p.NodeInfo                { return p2p.NodeInfo{} }
 func (tp *bcrTestPeer) Status() p2p.ConnectionStatus          { return p2p.ConnectionStatus{} }
 func (tp *bcrTestPeer) ID() p2p.ID                            { return tp.id }
 func (tp *bcrTestPeer) IsOutbound() bool                      { return false }

node/node.go

@@ -537,16 +537,16 @@ func (n *Node) ProxyApp() proxy.AppConns {
 	return n.proxyApp
 }
 
-func (n *Node) makeNodeInfo(pubKey crypto.PubKey) *p2p.NodeInfo {
+func (n *Node) makeNodeInfo(pubKey crypto.PubKey) p2p.NodeInfo {
 	txIndexerStatus := "on"
 	if _, ok := n.txIndexer.(*null.TxIndex); ok {
 		txIndexerStatus = "off"
 	}
-	nodeInfo := &p2p.NodeInfo{
+	nodeInfo := p2p.NodeInfo{
 		PubKey:  pubKey,
-		Moniker: n.config.Moniker,
 		Network: n.genesisDoc.ChainID,
 		Version: version.Version,
+		Moniker: n.config.Moniker,
 		Other: []string{
 			cmn.Fmt("wire_version=%v", wire.Version),
 			cmn.Fmt("p2p_version=%v", p2p.Version),
@@ -574,7 +574,7 @@ func (n *Node) makeNodeInfo(pubKey crypto.PubKey) *p2p.NodeInfo {
 //------------------------------------------------------------------------------
 
 // NodeInfo returns the Node's Info from the Switch.
-func (n *Node) NodeInfo() *p2p.NodeInfo {
+func (n *Node) NodeInfo() p2p.NodeInfo {
 	return n.sw.NodeInfo()
 }
 

p2p/addrbook.go

@@ -5,6 +5,7 @@
 package p2p
 
 import (
+	"crypto/sha256"
 	"encoding/binary"
 	"encoding/json"
 	"fmt"
@@ -867,3 +868,15 @@ func (ka *knownAddress) isBad() bool {
 
 	return false
 }
+
+//-----------------------------------------------------------------------------
+
+// doubleSha256 calculates sha256(sha256(b)) and returns the resulting bytes.
+func doubleSha256(b []byte) []byte {
+	hasher := sha256.New()
+	hasher.Write(b) // nolint: errcheck, gas
+	sum := hasher.Sum(nil)
+	hasher.Reset()
+	hasher.Write(sum) // nolint: errcheck, gas
+	return hasher.Sum(nil)
+}

p2p/base_reactor.go

@@ -0,0 +1,35 @@
+package p2p
+
+import cmn "github.com/tendermint/tmlibs/common"
+
+type Reactor interface {
+	cmn.Service // Start, Stop
+
+	SetSwitch(*Switch)
+	GetChannels() []*ChannelDescriptor
+	AddPeer(peer Peer)
+	RemovePeer(peer Peer, reason interface{})
+	Receive(chID byte, peer Peer, msgBytes []byte) // CONTRACT: msgBytes are not nil
+}
+
+//--------------------------------------
+
+type BaseReactor struct {
+	cmn.BaseService // Provides Start, Stop, .Quit
+	Switch          *Switch
+}
+
+func NewBaseReactor(name string, impl Reactor) *BaseReactor {
+	return &BaseReactor{
+		BaseService: *cmn.NewBaseService(nil, name, impl),
+		Switch:      nil,
+	}
+}
+
+func (br *BaseReactor) SetSwitch(sw *Switch) {
+	br.Switch = sw
+}
+func (_ *BaseReactor) GetChannels() []*ChannelDescriptor             { return nil }
+func (_ *BaseReactor) AddPeer(peer Peer)                             {}
+func (_ *BaseReactor) RemovePeer(peer Peer, reason interface{})      {}
+func (_ *BaseReactor) Receive(chID byte, peer Peer, msgBytes []byte) {}

p2p/netaddress.go

@@ -127,12 +127,25 @@ func NewNetAddressIPPort(ip net.IP, port uint16) *NetAddress {
 	return na
 }
 
-// Equals reports whether na and other are the same addresses.
+// Equals reports whether na and other are the same addresses,
+// including their ID, IP, and Port.
 func (na *NetAddress) Equals(other interface{}) bool {
 	if o, ok := other.(*NetAddress); ok {
 		return na.String() == o.String()
 	}
+	return false
+}
 
+// Same returns true is na has the same non-empty ID or DialString as other.
+func (na *NetAddress) Same(other interface{}) bool {
+	if o, ok := other.(*NetAddress); ok {
+		if na.DialString() == o.DialString() {
+			return true
+		}
+		if na.ID != "" && na.ID == o.ID {
+			return true
+		}
+	}
 	return false
 }
 

p2p/peer.go

@@ -1,7 +1,6 @@
 package p2p
 
 import (
-	"encoding/hex"
 	"fmt"
 	"net"
 	"time"
@@ -18,10 +17,10 @@ import (
 type Peer interface {
 	cmn.Service
 
-	ID() ID
-	IsOutbound() bool
-	IsPersistent() bool
-	NodeInfo() *NodeInfo
+	ID() ID             // peer's cryptographic ID
+	IsOutbound() bool   // did we dial the peer
+	IsPersistent() bool // do we redial this peer when we disconnect
+	NodeInfo() NodeInfo // peer's info
 	Status() ConnectionStatus
 
 	Send(byte, interface{}) bool
@@ -31,9 +30,9 @@ type Peer interface {
 	Get(string) interface{}
 }
 
-// Peer could be marked as persistent, in which case you can use
-// Redial function to reconnect. Note that inbound peers can't be
-// made persistent. They should be made persistent on the other end.
+//----------------------------------------------------------
+
+// peer implements Peer.
 //
 // Before using a peer, you will need to perform a handshake on connection.
 type peer struct {
@@ -47,7 +46,7 @@ type peer struct {
 	persistent bool
 	config     *PeerConfig
 
-	nodeInfo *NodeInfo
+	nodeInfo NodeInfo
 	Data     *cmn.CMap // User data.
 }
 
@@ -78,7 +77,7 @@ func DefaultPeerConfig() *PeerConfig {
 }
 
 func newOutboundPeer(addr *NetAddress, reactorsByCh map[byte]Reactor, chDescs []*ChannelDescriptor,
-	onPeerError func(Peer, interface{}), ourNodePrivKey crypto.PrivKey, config *PeerConfig) (*peer, error) {
+	onPeerError func(Peer, interface{}), ourNodePrivKey crypto.PrivKey, config *PeerConfig, persistent bool) (*peer, error) {
 
 	conn, err := dial(addr, config)
 	if err != nil {
@@ -92,6 +91,7 @@ func newOutboundPeer(addr *NetAddress, reactorsByCh map[byte]Reactor, chDescs []
 		}
 		return nil, err
 	}
+	peer.persistent = persistent
 
 	return peer, nil
 }
@@ -99,6 +99,8 @@ func newOutboundPeer(addr *NetAddress, reactorsByCh map[byte]Reactor, chDescs []
 func newInboundPeer(conn net.Conn, reactorsByCh map[byte]Reactor, chDescs []*ChannelDescriptor,
 	onPeerError func(Peer, interface{}), ourNodePrivKey crypto.PrivKey, config *PeerConfig) (*peer, error) {
 
+	// TODO: issue PoW challenge
+
 	return newPeerFromConnAndConfig(conn, false, reactorsByCh, chDescs, onPeerError, ourNodePrivKey, config)
 }
 
@@ -126,7 +128,7 @@ func newPeerFromConnAndConfig(rawConn net.Conn, outbound bool, reactorsByCh map[
 		}
 	}
 
-	// Key and NodeInfo are set after Handshake
+	// NodeInfo is set after Handshake
 	p := &peer{
 		outbound: outbound,
 		conn:     conn,
@@ -141,23 +143,41 @@ func newPeerFromConnAndConfig(rawConn net.Conn, outbound bool, reactorsByCh map[
 	return p, nil
 }
 
+//---------------------------------------------------
+// Implements cmn.Service
+
+// SetLogger implements BaseService.
 func (p *peer) SetLogger(l log.Logger) {
 	p.Logger = l
 	p.mconn.SetLogger(l)
 }
 
-// CloseConn should be used when the peer was created, but never started.
-func (p *peer) CloseConn() {
-	p.conn.Close() // nolint: errcheck
+// OnStart implements BaseService.
+func (p *peer) OnStart() error {
+	if err := p.BaseService.OnStart(); err != nil {
+		return err
+	}
+	err := p.mconn.Start()
+	return err
 }
 
-// makePersistent marks the peer as persistent.
-func (p *peer) makePersistent() {
-	if !p.outbound {
-		panic("inbound peers can't be made persistent")
-	}
+// OnStop implements BaseService.
+func (p *peer) OnStop() {
+	p.BaseService.OnStop()
+	p.mconn.Stop() // stop everything and close the conn
+}
 
-	p.persistent = true
+//---------------------------------------------------
+// Implements Peer
+
+// ID returns the peer's ID - the hex encoded hash of its pubkey.
+func (p *peer) ID() ID {
+	return PubKeyToID(p.PubKey())
+}
+
+// IsOutbound returns true if the connection is outbound, false otherwise.
+func (p *peer) IsOutbound() bool {
+	return p.outbound
 }
 
 // IsPersistent returns true if the peer is persitent, false otherwise.
@@ -165,25 +185,74 @@ func (p *peer) IsPersistent() bool {
 	return p.persistent
 }
 
-// HandshakeTimeout performs a handshake between a given node and the peer.
+// NodeInfo returns a copy of the peer's NodeInfo.
+func (p *peer) NodeInfo() NodeInfo {
+	return p.nodeInfo
+}
+
+// Status returns the peer's ConnectionStatus.
+func (p *peer) Status() ConnectionStatus {
+	return p.mconn.Status()
+}
+
+// Send msg to the channel identified by chID byte. Returns false if the send
+// queue is full after timeout, specified by MConnection.
+func (p *peer) Send(chID byte, msg interface{}) bool {
+	if !p.IsRunning() {
+		// see Switch#Broadcast, where we fetch the list of peers and loop over
+		// them - while we're looping, one peer may be removed and stopped.
+		return false
+	}
+	return p.mconn.Send(chID, msg)
+}
+
+// TrySend msg to the channel identified by chID byte. Immediately returns
+// false if the send queue is full.
+func (p *peer) TrySend(chID byte, msg interface{}) bool {
+	if !p.IsRunning() {
+		return false
+	}
+	return p.mconn.TrySend(chID, msg)
+}
+
+// Get the data for a given key.
+func (p *peer) Get(key string) interface{} {
+	return p.Data.Get(key)
+}
+
+// Set sets the data for the given key.
+func (p *peer) Set(key string, data interface{}) {
+	p.Data.Set(key, data)
+}
+
+//---------------------------------------------------
+// methods used by the Switch
+
+// CloseConn should be called by the Switch if the peer was created but never started.
+func (p *peer) CloseConn() {
+	p.conn.Close() // nolint: errcheck
+}
+
+// HandshakeTimeout performs the Tendermint P2P handshake between a given node and the peer
+// by exchanging their NodeInfo. It sets the received nodeInfo on the peer.
 // NOTE: blocking
-func (p *peer) HandshakeTimeout(ourNodeInfo *NodeInfo, timeout time.Duration) error {
+func (p *peer) HandshakeTimeout(ourNodeInfo NodeInfo, timeout time.Duration) error {
 	// Set deadline for handshake so we don't block forever on conn.ReadFull
 	if err := p.conn.SetDeadline(time.Now().Add(timeout)); err != nil {
 		return errors.Wrap(err, "Error setting deadline")
 	}
 
-	var peerNodeInfo = new(NodeInfo)
+	var peerNodeInfo NodeInfo
 	var err1 error
 	var err2 error
 	cmn.Parallel(
 		func() {
 			var n int
-			wire.WriteBinary(ourNodeInfo, p.conn, &n, &err1)
+			wire.WriteBinary(&ourNodeInfo, p.conn, &n, &err1)
 		},
 		func() {
 			var n int
-			wire.ReadBinary(peerNodeInfo, p.conn, maxNodeInfoSize, &n, &err2)
+			wire.ReadBinary(&peerNodeInfo, p.conn, maxNodeInfoSize, &n, &err2)
 			p.Logger.Info("Peer handshake", "peerNodeInfo", peerNodeInfo)
 		})
 	if err1 != nil {
@@ -193,19 +262,13 @@ func (p *peer) HandshakeTimeout(ourNodeInfo *NodeInfo, timeout time.Duration) er
 		return errors.Wrap(err2, "Error during handshake/read")
 	}
 
-	if p.config.AuthEnc {
-		// Check that the professed PubKey matches the sconn's.
-		if !peerNodeInfo.PubKey.Equals(p.PubKey().Wrap()) {
-			return fmt.Errorf("Ignoring connection with unmatching pubkey: %v vs %v",
-				peerNodeInfo.PubKey, p.PubKey())
-		}
-	}
-
 	// Remove deadline
 	if err := p.conn.SetDeadline(time.Time{}); err != nil {
 		return errors.Wrap(err, "Error removing deadline")
 	}
 
+	// TODO: fix the peerNodeInfo.ListenAddr
+
 	p.nodeInfo = peerNodeInfo
 	return nil
 }
@@ -217,7 +280,7 @@ func (p *peer) Addr() net.Addr {
 
 // PubKey returns peer's public key.
 func (p *peer) PubKey() crypto.PubKey {
-	if p.NodeInfo() != nil {
+	if !p.nodeInfo.PubKey.Empty() {
 		return p.nodeInfo.PubKey
 	} else if p.config.AuthEnc {
 		return p.conn.(*SecretConnection).RemotePubKey()
@@ -225,51 +288,6 @@ func (p *peer) PubKey() crypto.PubKey {
 	panic("Attempt to get peer's PubKey before calling Handshake")
 }
 
-// OnStart implements BaseService.
-func (p *peer) OnStart() error {
-	if err := p.BaseService.OnStart(); err != nil {
-		return err
-	}
-	err := p.mconn.Start()
-	return err
-}
-
-// OnStop implements BaseService.
-func (p *peer) OnStop() {
-	p.BaseService.OnStop()
-	p.mconn.Stop()
-}
-
-// Connection returns underlying MConnection.
-func (p *peer) Connection() *MConnection {
-	return p.mconn
-}
-
-// IsOutbound returns true if the connection is outbound, false otherwise.
-func (p *peer) IsOutbound() bool {
-	return p.outbound
-}
-
-// Send msg to the channel identified by chID byte. Returns false if the send
-// queue is full after timeout, specified by MConnection.
-func (p *peer) Send(chID byte, msg interface{}) bool {
-	if !p.IsRunning() {
-		// see Switch#Broadcast, where we fetch the list of peers and loop over
-		// them - while we're looping, one peer may be removed and stopped.
-		return false
-	}
-	return p.mconn.Send(chID, msg)
-}
-
-// TrySend msg to the channel identified by chID byte. Immediately returns
-// false if the send queue is full.
-func (p *peer) TrySend(chID byte, msg interface{}) bool {
-	if !p.IsRunning() {
-		return false
-	}
-	return p.mconn.TrySend(chID, msg)
-}
-
 // CanSend returns true if the send queue is not full, false otherwise.
 func (p *peer) CanSend(chID byte) bool {
 	if !p.IsRunning() {
@@ -287,39 +305,8 @@ func (p *peer) String() string {
 	return fmt.Sprintf("Peer{%v %v in}", p.mconn, p.ID())
 }
 
-// Equals reports whenever 2 peers are actually represent the same node.
-func (p *peer) Equals(other Peer) bool {
-	return p.ID() == other.ID()
-}
-
-// Get the data for a given key.
-func (p *peer) Get(key string) interface{} {
-	return p.Data.Get(key)
-}
-
-// Set sets the data for the given key.
-func (p *peer) Set(key string, data interface{}) {
-	p.Data.Set(key, data)
-}
-
-// ID returns the peer's ID - the hex encoded hash of its pubkey.
-func (p *peer) ID() ID {
-	return ID(hex.EncodeToString(p.PubKey().Address()))
-}
-
-// NodeInfo returns a copy of the peer's NodeInfo.
-func (p *peer) NodeInfo() *NodeInfo {
-	if p.nodeInfo == nil {
-		return nil
-	}
-	n := *p.nodeInfo // copy
-	return &n
-}
-
-// Status returns the peer's ConnectionStatus.
-func (p *peer) Status() ConnectionStatus {
-	return p.mconn.Status()
-}
+//------------------------------------------------------------------
+// helper funcs
 
 func dial(addr *NetAddress, config *PeerConfig) (net.Conn, error) {
 	conn, err := addr.DialTimeout(config.DialTimeout * time.Second)

p2p/peer_set_test.go

@@ -14,7 +14,7 @@ import (
 // Returns an empty dummy peer
 func randPeer() *peer {
 	return &peer{
-		nodeInfo: &NodeInfo{
+		nodeInfo: NodeInfo{
 			ListenAddr: cmn.Fmt("%v.%v.%v.%v:46656", rand.Int()%256, rand.Int()%256, rand.Int()%256, rand.Int()%256),
 			PubKey:     crypto.GenPrivKeyEd25519().Wrap().PubKey(),
 		},

p2p/peer_test.go

@@ -30,7 +30,7 @@ func TestPeerBasic(t *testing.T) {
 	assert.True(p.IsRunning())
 	assert.True(p.IsOutbound())
 	assert.False(p.IsPersistent())
-	p.makePersistent()
+	p.persistent = true
 	assert.True(p.IsPersistent())
 	assert.Equal(rp.Addr().String(), p.Addr().String())
 	assert.Equal(rp.PubKey(), p.PubKey())
@@ -86,11 +86,11 @@ func createOutboundPeerAndPerformHandshake(addr *NetAddress, config *PeerConfig)
 	}
 	reactorsByCh := map[byte]Reactor{0x01: NewTestReactor(chDescs, true)}
 	pk := crypto.GenPrivKeyEd25519().Wrap()
-	p, err := newOutboundPeer(addr, reactorsByCh, chDescs, func(p Peer, r interface{}) {}, pk, config)
+	p, err := newOutboundPeer(addr, reactorsByCh, chDescs, func(p Peer, r interface{}) {}, pk, config, false)
 	if err != nil {
 		return nil, err
 	}
-	err = p.HandshakeTimeout(&NodeInfo{
+	err = p.HandshakeTimeout(NodeInfo{
 		PubKey:  pk.PubKey(),
 		Moniker: "host_peer",
 		Network: "testing",
@@ -141,7 +141,7 @@ func (p *remotePeer) accept(l net.Listener) {
 		if err != nil {
 			golog.Fatalf("Failed to create a peer: %+v", err)
 		}
-		err = peer.HandshakeTimeout(&NodeInfo{
+		err = peer.HandshakeTimeout(NodeInfo{
 			PubKey:     p.PrivKey.PubKey(),
 			Moniker:    "remote_peer",
 			Network:    "testing",

p2p/pex_reactor.go

@@ -115,7 +115,8 @@ func (r *PEXReactor) AddPeer(p Peer) {
 			r.RequestPEX(p)
 		}
 	} else {
-		// For inbound connections, the peer is its own source
+		// For inbound connections, the peer is its own source,
+		// and its NodeInfo has already been validated
 		addr := p.NodeInfo().NetAddress()
 		r.book.AddAddress(addr, addr)
 	}
@@ -130,7 +131,6 @@ func (r *PEXReactor) RemovePeer(p Peer, reason interface{}) {
 // Receive implements Reactor by handling incoming PEX messages.
 func (r *PEXReactor) Receive(chID byte, src Peer, msgBytes []byte) {
 	srcAddr := src.NodeInfo().NetAddress()
-
 	r.IncrementMsgCountForPeer(srcAddr.ID)
 	if r.ReachedMaxMsgCountForPeer(srcAddr.ID) {
 		r.Logger.Error("Maximum number of messages reached for peer", "peer", srcAddr)

p2p/pex_reactor_test.go

@@ -242,7 +242,7 @@ func createRoutableAddr() (addr string, netAddr *NetAddress) {
 func createRandomPeer(outbound bool) *peer {
 	addr, netAddr := createRoutableAddr()
 	p := &peer{
-		nodeInfo: &NodeInfo{
+		nodeInfo: NodeInfo{
 			ListenAddr: netAddr.String(),
 			PubKey:     crypto.GenPrivKeyEd25519().Wrap().PubKey(),
 		},

p2p/switch.go

@@ -12,7 +12,6 @@ import (
 	crypto "github.com/tendermint/go-crypto"
 	cfg "github.com/tendermint/tendermint/config"
 	cmn "github.com/tendermint/tmlibs/common"
-	"github.com/tendermint/tmlibs/log"
 )
 
 const (
@@ -31,46 +30,17 @@ const (
 	reconnectBackOffBaseSeconds = 3
 )
 
-type Reactor interface {
-	cmn.Service // Start, Stop
-
-	SetSwitch(*Switch)
-	GetChannels() []*ChannelDescriptor
-	AddPeer(peer Peer)
-	RemovePeer(peer Peer, reason interface{})
-	Receive(chID byte, peer Peer, msgBytes []byte) // CONTRACT: msgBytes are not nil
-}
-
-//--------------------------------------
-
-type BaseReactor struct {
-	cmn.BaseService // Provides Start, Stop, .Quit
-	Switch          *Switch
-}
-
-func NewBaseReactor(name string, impl Reactor) *BaseReactor {
-	return &BaseReactor{
-		BaseService: *cmn.NewBaseService(nil, name, impl),
-		Switch:      nil,
-	}
-}
-
-func (br *BaseReactor) SetSwitch(sw *Switch) {
-	br.Switch = sw
-}
-func (_ *BaseReactor) GetChannels() []*ChannelDescriptor             { return nil }
-func (_ *BaseReactor) AddPeer(peer Peer)                             {}
-func (_ *BaseReactor) RemovePeer(peer Peer, reason interface{})      {}
-func (_ *BaseReactor) Receive(chID byte, peer Peer, msgBytes []byte) {}
+var (
+	ErrSwitchDuplicatePeer = errors.New("Duplicate peer")
+	ErrSwitchConnectToSelf = errors.New("Connect to self")
+)
 
 //-----------------------------------------------------------------------------
 
-/*
-The `Switch` handles peer connections and exposes an API to receive incoming messages
-on `Reactors`.  Each `Reactor` is responsible for handling incoming messages of one
-or more `Channels`.  So while sending outgoing messages is typically performed on the peer,
-incoming messages are received on the reactor.
-*/
+// `Switch` handles peer connections and exposes an API to receive incoming messages
+// on `Reactors`.  Each `Reactor` is responsible for handling incoming messages of one
+// or more `Channels`.  So while sending outgoing messages is typically performed on the peer,
+// incoming messages are received on the reactor.
 type Switch struct {
 	cmn.BaseService
 
@@ -82,8 +52,8 @@ type Switch struct {
 	reactorsByCh map[byte]Reactor
 	peers        *PeerSet
 	dialing      *cmn.CMap
-	nodeInfo     *NodeInfo // our node info
-	nodeKey      *NodeKey  // our node privkey
+	nodeInfo     NodeInfo // our node info
+	nodeKey      *NodeKey // our node privkey
 
 	filterConnByAddr   func(net.Addr) error
 	filterConnByPubKey func(crypto.PubKey) error
@@ -91,11 +61,6 @@ type Switch struct {
 	rng *rand.Rand // seed for randomizing dial times and orders
 }
 
-var (
-	ErrSwitchDuplicatePeer = errors.New("Duplicate peer")
-	ErrSwitchConnectToSelf = errors.New("Connect to self")
-)
-
 func NewSwitch(config *cfg.P2PConfig) *Switch {
 	sw := &Switch{
 		config:       config,
@@ -105,7 +70,6 @@ func NewSwitch(config *cfg.P2PConfig) *Switch {
 		reactorsByCh: make(map[byte]Reactor),
 		peers:        NewPeerSet(),
 		dialing:      cmn.NewCMap(),
-		nodeInfo:     nil,
 	}
 
 	// Ensure we have a completely undeterministic PRNG. cmd.RandInt64() draws
@@ -122,6 +86,9 @@ func NewSwitch(config *cfg.P2PConfig) *Switch {
 	return sw
 }
 
+//---------------------------------------------------------------------
+// Switch setup
+
 // AddReactor adds the given reactor to the switch.
 // NOTE: Not goroutine safe.
 func (sw *Switch) AddReactor(name string, reactor Reactor) Reactor {
@@ -173,26 +140,25 @@ func (sw *Switch) IsListening() bool {
 
 // SetNodeInfo sets the switch's NodeInfo for checking compatibility and handshaking with other nodes.
 // NOTE: Not goroutine safe.
-func (sw *Switch) SetNodeInfo(nodeInfo *NodeInfo) {
+func (sw *Switch) SetNodeInfo(nodeInfo NodeInfo) {
 	sw.nodeInfo = nodeInfo
 }
 
 // NodeInfo returns the switch's NodeInfo.
 // NOTE: Not goroutine safe.
-func (sw *Switch) NodeInfo() *NodeInfo {
+func (sw *Switch) NodeInfo() NodeInfo {
 	return sw.nodeInfo
 }
 
 // SetNodeKey sets the switch's private key for authenticated encryption.
-// NOTE: Overwrites sw.nodeInfo.PubKey.
 // NOTE: Not goroutine safe.
 func (sw *Switch) SetNodeKey(nodeKey *NodeKey) {
 	sw.nodeKey = nodeKey
-	if sw.nodeInfo != nil {
-		sw.nodeInfo.PubKey = nodeKey.PubKey()
-	}
 }
 
+//---------------------------------------------------------------------
+// Service start/stop
+
 // OnStart implements BaseService. It starts all the reactors, peers, and listeners.
 func (sw *Switch) OnStart() error {
 	// Start reactors
@@ -228,176 +194,26 @@ func (sw *Switch) OnStop() {
 	}
 }
 
-// addPeer checks the given peer's validity, performs a handshake, and adds the
-// peer to the switch and to all registered reactors.
-// NOTE: This performs a blocking handshake before the peer is added.
-// NOTE: If error is returned, caller is responsible for calling peer.CloseConn()
-func (sw *Switch) addPeer(peer *peer) error {
-	// Avoid self
-	if sw.nodeKey.ID() == peer.ID() {
-		return ErrSwitchConnectToSelf
-	}
-
-	// Filter peer against white list
-	if err := sw.FilterConnByAddr(peer.Addr()); err != nil {
-		return err
-	}
-	if err := sw.FilterConnByPubKey(peer.PubKey()); err != nil {
-		return err
-	}
-
-	if err := peer.HandshakeTimeout(sw.nodeInfo, time.Duration(sw.peerConfig.HandshakeTimeout*time.Second)); err != nil {
-		return err
-	}
-
-	// Avoid duplicate
-	if sw.peers.Has(peer.ID()) {
-		return ErrSwitchDuplicatePeer
-
-	}
-
-	// Check version, chain id
-	if err := sw.nodeInfo.CompatibleWith(peer.NodeInfo()); err != nil {
-		return err
-	}
+//---------------------------------------------------------------------
+// Peers
 
-	// Start peer
-	if sw.IsRunning() {
-		sw.startInitPeer(peer)
-	}
-
-	// Add the peer to .peers.
-	// We start it first so that a peer in the list is safe to Stop.
-	// It should not err since we already checked peers.Has().
-	if err := sw.peers.Add(peer); err != nil {
-		return err
-	}
-
-	sw.Logger.Info("Added peer", "peer", peer)
-	return nil
-}
-
-// FilterConnByAddr returns an error if connecting to the given address is forbidden.
-func (sw *Switch) FilterConnByAddr(addr net.Addr) error {
-	if sw.filterConnByAddr != nil {
-		return sw.filterConnByAddr(addr)
-	}
-	return nil
-}
-
-// FilterConnByPubKey returns an error if connecting to the given public key is forbidden.
-func (sw *Switch) FilterConnByPubKey(pubkey crypto.PubKey) error {
-	if sw.filterConnByPubKey != nil {
-		return sw.filterConnByPubKey(pubkey)
-	}
-	return nil
-
-}
-
-// SetAddrFilter sets the function for filtering connections by address.
-func (sw *Switch) SetAddrFilter(f func(net.Addr) error) {
-	sw.filterConnByAddr = f
-}
-
-// SetPubKeyFilter sets the function for filtering connections by public key.
-func (sw *Switch) SetPubKeyFilter(f func(crypto.PubKey) error) {
-	sw.filterConnByPubKey = f
-}
-
-func (sw *Switch) startInitPeer(peer *peer) {
-	err := peer.Start() // spawn send/recv routines
-	if err != nil {
-		// Should never happen
-		sw.Logger.Error("Error starting peer", "peer", peer, "err", err)
-	}
-
-	for _, reactor := range sw.reactors {
-		reactor.AddPeer(peer)
-	}
+// Peers returns the set of peers that are connected to the switch.
+func (sw *Switch) Peers() IPeerSet {
+	return sw.peers
 }
 
-// DialPeersAsync dials a list of peers asynchronously in random order (optionally, making them persistent).
-func (sw *Switch) DialPeersAsync(addrBook *AddrBook, peers []string, persistent bool) error {
-	netAddrs, errs := NewNetAddressStrings(peers)
-	// TODO: IDs
-	for _, err := range errs {
-		sw.Logger.Error("Error in peer's address", "err", err)
-	}
-
-	if addrBook != nil {
-		// add peers to `addrBook`
-		ourAddrS := sw.nodeInfo.ListenAddr
-		ourAddr, _ := NewNetAddressString(ourAddrS)
-		for _, netAddr := range netAddrs {
-			// do not add ourselves
-			if netAddr.Equals(ourAddr) {
-				continue
-			}
-			addrBook.AddAddress(netAddr, ourAddr)
+// NumPeers returns the count of outbound/inbound and outbound-dialing peers.
+func (sw *Switch) NumPeers() (outbound, inbound, dialing int) {
+	peers := sw.peers.List()
+	for _, peer := range peers {
+		if peer.IsOutbound() {
+			outbound++
+		} else {
+			inbound++
 		}
-		addrBook.Save()
-	}
-
-	// permute the list, dial them in random order.
-	perm := sw.rng.Perm(len(netAddrs))
-	for i := 0; i < len(perm); i++ {
-		go func(i int) {
-			sw.randomSleep(0)
-			j := perm[i]
-			peer, err := sw.DialPeerWithAddress(netAddrs[j], persistent)
-			if err != nil {
-				sw.Logger.Error("Error dialing peer", "err", err)
-			} else {
-				sw.Logger.Info("Connected to peer", "peer", peer)
-			}
-		}(i)
-	}
-	return nil
-}
-
-// sleep for interval plus some random amount of ms on [0, dialRandomizerIntervalMilliseconds]
-func (sw *Switch) randomSleep(interval time.Duration) {
-	r := time.Duration(sw.rng.Int63n(dialRandomizerIntervalMilliseconds)) * time.Millisecond
-	time.Sleep(r + interval)
-}
-
-// DialPeerWithAddress dials the given peer and runs sw.addPeer if it connects successfully.
-// If `persistent == true`, the switch will always try to reconnect to this peer if the connection ever fails.
-func (sw *Switch) DialPeerWithAddress(addr *NetAddress, persistent bool) (Peer, error) {
-	sw.dialing.Set(string(addr.ID), addr)
-	defer sw.dialing.Delete(string(addr.ID))
-
-	sw.Logger.Info("Dialing peer", "address", addr)
-	peer, err := newOutboundPeer(addr, sw.reactorsByCh, sw.chDescs, sw.StopPeerForError, sw.nodeKey.PrivKey, sw.peerConfig)
-	if err != nil {
-		sw.Logger.Error("Failed to dial peer", "address", addr, "err", err)
-		return nil, err
-	}
-	peer.SetLogger(sw.Logger.With("peer", addr))
-
-	// authenticate peer
-	if addr.ID == "" {
-		peer.Logger.Info("Dialed peer with unknown ID - unable to authenticate", "addr", addr)
-	} else if addr.ID != peer.ID() {
-		return nil, fmt.Errorf("Failed to authenticate peer %v. Connected to peer with ID %s", addr, peer.ID())
 	}
-
-	if persistent {
-		peer.makePersistent()
-	}
-	err = sw.addPeer(peer)
-	if err != nil {
-		sw.Logger.Error("Failed to add peer", "address", addr, "err", err)
-		peer.CloseConn()
-		return nil, err
-	}
-	sw.Logger.Info("Dialed and added peer", "address", addr, "peer", peer)
-	return peer, nil
-}
-
-// IsDialing returns true if the switch is currently dialing the given ID.
-func (sw *Switch) IsDialing(id ID) bool {
-	return sw.dialing.Has(string(id))
+	dialing = sw.dialing.Size()
+	return
 }
 
 // Broadcast runs a go routine for each attempted send, which will block
@@ -417,25 +233,6 @@ func (sw *Switch) Broadcast(chID byte, msg interface{}) chan bool {
 	return successChan
 }
 
-// NumPeers returns the count of outbound/inbound and outbound-dialing peers.
-func (sw *Switch) NumPeers() (outbound, inbound, dialing int) {
-	peers := sw.peers.List()
-	for _, peer := range peers {
-		if peer.IsOutbound() {
-			outbound++
-		} else {
-			inbound++
-		}
-	}
-	dialing = sw.dialing.Size()
-	return
-}
-
-// Peers returns the set of peers that are connected to the switch.
-func (sw *Switch) Peers() IPeerSet {
-	return sw.peers
-}
-
 // StopPeerForError disconnects from a peer due to external error.
 // If the peer is persistent, it will attempt to reconnect.
 // TODO: make record depending on reason.
@@ -448,6 +245,21 @@ func (sw *Switch) StopPeerForError(peer Peer, reason interface{}) {
 	}
 }
 
+// StopPeerGracefully disconnects from a peer gracefully.
+// TODO: handle graceful disconnects.
+func (sw *Switch) StopPeerGracefully(peer Peer) {
+	sw.Logger.Info("Stopping peer gracefully")
+	sw.stopAndRemovePeer(peer, nil)
+}
+
+func (sw *Switch) stopAndRemovePeer(peer Peer, reason interface{}) {
+	sw.peers.Remove(peer)
+	peer.Stop()
+	for _, reactor := range sw.reactors {
+		reactor.RemovePeer(peer, reason)
+	}
+}
+
 // reconnectToPeer tries to reconnect to the peer, first repeatedly
 // with a fixed interval, then with exponential backoff.
 // If no success after all that, it stops trying, and leaves it
@@ -495,21 +307,97 @@ func (sw *Switch) reconnectToPeer(peer Peer) {
 	sw.Logger.Error("Failed to reconnect to peer. Giving up", "peer", peer, "elapsed", time.Since(start))
 }
 
-// StopPeerGracefully disconnects from a peer gracefully.
-// TODO: handle graceful disconnects.
-func (sw *Switch) StopPeerGracefully(peer Peer) {
-	sw.Logger.Info("Stopping peer gracefully")
-	sw.stopAndRemovePeer(peer, nil)
+//---------------------------------------------------------------------
+// Dialing
+
+// IsDialing returns true if the switch is currently dialing the given ID.
+func (sw *Switch) IsDialing(id ID) bool {
+	return sw.dialing.Has(string(id))
 }
 
-func (sw *Switch) stopAndRemovePeer(peer Peer, reason interface{}) {
-	sw.peers.Remove(peer)
-	peer.Stop()
-	for _, reactor := range sw.reactors {
-		reactor.RemovePeer(peer, reason)
+// DialPeersAsync dials a list of peers asynchronously in random order (optionally, making them persistent).
+func (sw *Switch) DialPeersAsync(addrBook *AddrBook, peers []string, persistent bool) error {
+	netAddrs, errs := NewNetAddressStrings(peers)
+	for _, err := range errs {
+		sw.Logger.Error("Error in peer's address", "err", err)
+	}
+
+	if addrBook != nil {
+		// add peers to `addrBook`
+		ourAddr := sw.nodeInfo.NetAddress()
+		for _, netAddr := range netAddrs {
+			// do not add our address or ID
+			if netAddr.Same(ourAddr) {
+				continue
+			}
+			addrBook.AddAddress(netAddr, ourAddr)
+		}
+		addrBook.Save()
+	}
+
+	// permute the list, dial them in random order.
+	perm := sw.rng.Perm(len(netAddrs))
+	for i := 0; i < len(perm); i++ {
+		go func(i int) {
+			sw.randomSleep(0)
+			j := perm[i]
+			peer, err := sw.DialPeerWithAddress(netAddrs[j], persistent)
+			if err != nil {
+				sw.Logger.Error("Error dialing peer", "err", err)
+			} else {
+				sw.Logger.Info("Connected to peer", "peer", peer)
+			}
+		}(i)
 	}
+	return nil
+}
+
+// DialPeerWithAddress dials the given peer and runs sw.addPeer if it connects and authenticates successfully.
+// If `persistent == true`, the switch will always try to reconnect to this peer if the connection ever fails.
+func (sw *Switch) DialPeerWithAddress(addr *NetAddress, persistent bool) (Peer, error) {
+	sw.dialing.Set(string(addr.ID), addr)
+	defer sw.dialing.Delete(string(addr.ID))
+	return sw.addOutboundPeerWithConfig(addr, sw.peerConfig, persistent)
+}
+
+// sleep for interval plus some random amount of ms on [0, dialRandomizerIntervalMilliseconds]
+func (sw *Switch) randomSleep(interval time.Duration) {
+	r := time.Duration(sw.rng.Int63n(dialRandomizerIntervalMilliseconds)) * time.Millisecond
+	time.Sleep(r + interval)
+}
+
+//------------------------------------------------------------------------------------
+// Connection filtering
+
+// FilterConnByAddr returns an error if connecting to the given address is forbidden.
+func (sw *Switch) FilterConnByAddr(addr net.Addr) error {
+	if sw.filterConnByAddr != nil {
+		return sw.filterConnByAddr(addr)
+	}
+	return nil
+}
+
+// FilterConnByPubKey returns an error if connecting to the given public key is forbidden.
+func (sw *Switch) FilterConnByPubKey(pubkey crypto.PubKey) error {
+	if sw.filterConnByPubKey != nil {
+		return sw.filterConnByPubKey(pubkey)
+	}
+	return nil
+
+}
+
+// SetAddrFilter sets the function for filtering connections by address.
+func (sw *Switch) SetAddrFilter(f func(net.Addr) error) {
+	sw.filterConnByAddr = f
+}
+
+// SetPubKeyFilter sets the function for filtering connections by public key.
+func (sw *Switch) SetPubKeyFilter(f func(crypto.PubKey) error) {
+	sw.filterConnByPubKey = f
 }
 
+//------------------------------------------------------------------------------------
+
 func (sw *Switch) listenerRoutine(l Listener) {
 	for {
 		inConn, ok := <-l.Connections()
@@ -525,133 +413,124 @@ func (sw *Switch) listenerRoutine(l Listener) {
 		}
 
 		// New inbound connection!
-		err := sw.addPeerWithConnectionAndConfig(inConn, sw.peerConfig)
+		err := sw.addInboundPeerWithConfig(inConn, sw.peerConfig)
 		if err != nil {
 			sw.Logger.Info("Ignoring inbound connection: error while adding peer", "address", inConn.RemoteAddr().String(), "err", err)
 			continue
 		}
-
-		// NOTE: We don't yet have the listening port of the
-		// remote (if they have a listener at all).
-		// The peerHandshake will handle that.
 	}
 
 	// cleanup
 }
 
-//------------------------------------------------------------------
-// Connects switches via arbitrary net.Conn. Used for testing.
-
-// MakeConnectedSwitches returns n switches, connected according to the connect func.
-// If connect==Connect2Switches, the switches will be fully connected.
-// initSwitch defines how the i'th switch should be initialized (ie. with what reactors).
-// NOTE: panics if any switch fails to start.
-func MakeConnectedSwitches(cfg *cfg.P2PConfig, n int, initSwitch func(int, *Switch) *Switch, connect func([]*Switch, int, int)) []*Switch {
-	switches := make([]*Switch, n)
-	for i := 0; i < n; i++ {
-		switches[i] = makeSwitch(cfg, i, "testing", "123.123.123", initSwitch)
+func (sw *Switch) addInboundPeerWithConfig(conn net.Conn, config *PeerConfig) error {
+	peer, err := newInboundPeer(conn, sw.reactorsByCh, sw.chDescs, sw.StopPeerForError, sw.nodeKey.PrivKey, config)
+	if err != nil {
+		peer.CloseConn()
+		return err
 	}
-
-	if err := StartSwitches(switches); err != nil {
-		panic(err)
+	peer.SetLogger(sw.Logger.With("peer", conn.RemoteAddr()))
+	if err = sw.addPeer(peer); err != nil {
+		peer.CloseConn()
+		return err
 	}
 
-	for i := 0; i < n; i++ {
-		for j := i + 1; j < n; j++ {
-			connect(switches, i, j)
-		}
+	return nil
+}
+
+// dial the peer; make secret connection; authenticate against the dialed ID;
+// add the peer.
+func (sw *Switch) addOutboundPeerWithConfig(addr *NetAddress, config *PeerConfig, persistent bool) (Peer, error) {
+	sw.Logger.Info("Dialing peer", "address", addr)
+	peer, err := newOutboundPeer(addr, sw.reactorsByCh, sw.chDescs, sw.StopPeerForError, sw.nodeKey.PrivKey, config, persistent)
+	if err != nil {
+		sw.Logger.Error("Failed to dial peer", "address", addr, "err", err)
+		return nil, err
 	}
+	peer.SetLogger(sw.Logger.With("peer", addr))
 
-	return switches
-}
+	// authenticate peer
+	if addr.ID == "" {
+		peer.Logger.Info("Dialed peer with unknown ID - unable to authenticate", "addr", addr)
+	} else if addr.ID != peer.ID() {
+		peer.CloseConn()
+		return nil, fmt.Errorf("Failed to authenticate peer %v. Connected to peer with ID %s", addr, peer.ID())
+	}
 
-// Connect2Switches will connect switches i and j via net.Pipe().
-// Blocks until a connection is established.
-// NOTE: caller ensures i and j are within bounds.
-func Connect2Switches(switches []*Switch, i, j int) {
-	switchI := switches[i]
-	switchJ := switches[j]
-	c1, c2 := netPipe()
-	doneCh := make(chan struct{})
-	go func() {
-		err := switchI.addPeerWithConnection(c1)
-		if err != nil {
-			panic(err)
-		}
-		doneCh <- struct{}{}
-	}()
-	go func() {
-		err := switchJ.addPeerWithConnection(c2)
-		if err != nil {
-			panic(err)
-		}
-		doneCh <- struct{}{}
-	}()
-	<-doneCh
-	<-doneCh
+	err = sw.addPeer(peer)
+	if err != nil {
+		sw.Logger.Error("Failed to add peer", "address", addr, "err", err)
+		peer.CloseConn()
+		return nil, err
+	}
+	sw.Logger.Info("Dialed and added peer", "address", addr, "peer", peer)
+	return peer, nil
 }
 
-// StartSwitches calls sw.Start() for each given switch.
-// It returns the first encountered error.
-func StartSwitches(switches []*Switch) error {
-	for _, s := range switches {
-		err := s.Start() // start switch and reactors
-		if err != nil {
-			return err
-		}
+// addPeer performs the Tendermint P2P handshake with a peer
+// that already has a SecretConnection. If all goes well,
+// it starts the peer and adds it to the switch.
+// NOTE: This performs a blocking handshake before the peer is added.
+// NOTE: If error is returned, caller is responsible for calling peer.CloseConn()
+func (sw *Switch) addPeer(peer *peer) error {
+	// Avoid self
+	if sw.nodeKey.ID() == peer.ID() {
+		return ErrSwitchConnectToSelf
 	}
-	return nil
-}
 
-func makeSwitch(cfg *cfg.P2PConfig, i int, network, version string, initSwitch func(int, *Switch) *Switch) *Switch {
-	// new switch, add reactors
-	// TODO: let the config be passed in?
-	nodeKey := &NodeKey{
-		PrivKey: crypto.GenPrivKeyEd25519().Wrap(),
+	// Avoid duplicate
+	if sw.peers.Has(peer.ID()) {
+		return ErrSwitchDuplicatePeer
+
 	}
-	s := initSwitch(i, NewSwitch(cfg))
-	s.SetNodeInfo(&NodeInfo{
-		PubKey:     nodeKey.PubKey(),
-		Moniker:    cmn.Fmt("switch%d", i),
-		Network:    network,
-		Version:    version,
-		ListenAddr: cmn.Fmt("%v:%v", network, rand.Intn(64512)+1023),
-	})
-	s.SetNodeKey(nodeKey)
-	s.SetLogger(log.TestingLogger())
-	return s
-}
 
-func (sw *Switch) addPeerWithConnection(conn net.Conn) error {
-	peer, err := newInboundPeer(conn, sw.reactorsByCh, sw.chDescs, sw.StopPeerForError, sw.nodeKey.PrivKey, sw.peerConfig)
-	if err != nil {
-		if err := conn.Close(); err != nil {
-			sw.Logger.Error("Error closing connection", "err", err)
-		}
+	// Filter peer against white list
+	if err := sw.FilterConnByAddr(peer.Addr()); err != nil {
 		return err
 	}
-	peer.SetLogger(sw.Logger.With("peer", conn.RemoteAddr()))
-	if err = sw.addPeer(peer); err != nil {
-		peer.CloseConn()
+	if err := sw.FilterConnByPubKey(peer.PubKey()); err != nil {
 		return err
 	}
 
-	return nil
-}
+	// Exchange NodeInfo with the peer
+	if err := peer.HandshakeTimeout(sw.nodeInfo, time.Duration(sw.peerConfig.HandshakeTimeout*time.Second)); err != nil {
+		return err
+	}
 
-func (sw *Switch) addPeerWithConnectionAndConfig(conn net.Conn, config *PeerConfig) error {
-	peer, err := newInboundPeer(conn, sw.reactorsByCh, sw.chDescs, sw.StopPeerForError, sw.nodeKey.PrivKey, config)
-	if err != nil {
-		if err := conn.Close(); err != nil {
-			sw.Logger.Error("Error closing connection", "err", err)
-		}
+	// Validate the peers nodeInfo against the pubkey
+	if err := peer.NodeInfo().Validate(peer.PubKey()); err != nil {
 		return err
 	}
-	peer.SetLogger(sw.Logger.With("peer", conn.RemoteAddr()))
-	if err = sw.addPeer(peer); err != nil {
-		peer.CloseConn()
+
+	// Check version, chain id
+	if err := sw.nodeInfo.CompatibleWith(peer.NodeInfo()); err != nil {
 		return err
 	}
 
+	// All good. Start peer
+	if sw.IsRunning() {
+		sw.startInitPeer(peer)
+	}
+
+	// Add the peer to .peers.
+	// We start it first so that a peer in the list is safe to Stop.
+	// It should not err since we already checked peers.Has().
+	if err := sw.peers.Add(peer); err != nil {
+		return err
+	}
+
+	sw.Logger.Info("Added peer", "peer", peer)
 	return nil
 }
+
+func (sw *Switch) startInitPeer(peer *peer) {
+	err := peer.Start() // spawn send/recv routines
+	if err != nil {
+		// Should never happen
+		sw.Logger.Error("Error starting peer", "peer", peer, "err", err)
+	}
+
+	for _, reactor := range sw.reactors {
+		reactor.AddPeer(peer)
+	}
+}

p2p/switch_test.go

@@ -236,7 +236,7 @@ func TestSwitchStopsNonPersistentPeerOnError(t *testing.T) {
 	rp.Start()
 	defer rp.Stop()
 
-	peer, err := newOutboundPeer(rp.Addr(), sw.reactorsByCh, sw.chDescs, sw.StopPeerForError, sw.nodeKey.PrivKey, DefaultPeerConfig())
+	peer, err := newOutboundPeer(rp.Addr(), sw.reactorsByCh, sw.chDescs, sw.StopPeerForError, sw.nodeKey.PrivKey, DefaultPeerConfig(), false)
 	require.Nil(err)
 	err = sw.addPeer(peer)
 	require.Nil(err)
@@ -263,8 +263,7 @@ func TestSwitchReconnectsToPersistentPeer(t *testing.T) {
 	rp.Start()
 	defer rp.Stop()
 
-	peer, err := newOutboundPeer(rp.Addr(), sw.reactorsByCh, sw.chDescs, sw.StopPeerForError, sw.nodeKey.PrivKey, DefaultPeerConfig())
-	peer.makePersistent()
+	peer, err := newOutboundPeer(rp.Addr(), sw.reactorsByCh, sw.chDescs, sw.StopPeerForError, sw.nodeKey.PrivKey, DefaultPeerConfig(), true)
 	require.Nil(err)
 	err = sw.addPeer(peer)
 	require.Nil(err)

p2p/test_util.go

@@ -0,0 +1,111 @@
+package p2p
+
+import (
+	"math/rand"
+	"net"
+
+	crypto "github.com/tendermint/go-crypto"
+	cfg "github.com/tendermint/tendermint/config"
+	cmn "github.com/tendermint/tmlibs/common"
+	"github.com/tendermint/tmlibs/log"
+)
+
+//------------------------------------------------------------------
+// Connects switches via arbitrary net.Conn. Used for testing.
+
+// MakeConnectedSwitches returns n switches, connected according to the connect func.
+// If connect==Connect2Switches, the switches will be fully connected.
+// initSwitch defines how the i'th switch should be initialized (ie. with what reactors).
+// NOTE: panics if any switch fails to start.
+func MakeConnectedSwitches(cfg *cfg.P2PConfig, n int, initSwitch func(int, *Switch) *Switch, connect func([]*Switch, int, int)) []*Switch {
+	switches := make([]*Switch, n)
+	for i := 0; i < n; i++ {
+		switches[i] = makeSwitch(cfg, i, "testing", "123.123.123", initSwitch)
+	}
+
+	if err := StartSwitches(switches); err != nil {
+		panic(err)
+	}
+
+	for i := 0; i < n; i++ {
+		for j := i + 1; j < n; j++ {
+			connect(switches, i, j)
+		}
+	}
+
+	return switches
+}
+
+// Connect2Switches will connect switches i and j via net.Pipe().
+// Blocks until a connection is established.
+// NOTE: caller ensures i and j are within bounds.
+func Connect2Switches(switches []*Switch, i, j int) {
+	switchI := switches[i]
+	switchJ := switches[j]
+	c1, c2 := netPipe()
+	doneCh := make(chan struct{})
+	go func() {
+		err := switchI.addPeerWithConnection(c1)
+		if err != nil {
+			panic(err)
+		}
+		doneCh <- struct{}{}
+	}()
+	go func() {
+		err := switchJ.addPeerWithConnection(c2)
+		if err != nil {
+			panic(err)
+		}
+		doneCh <- struct{}{}
+	}()
+	<-doneCh
+	<-doneCh
+}
+
+func (sw *Switch) addPeerWithConnection(conn net.Conn) error {
+	peer, err := newInboundPeer(conn, sw.reactorsByCh, sw.chDescs, sw.StopPeerForError, sw.nodeKey.PrivKey, sw.peerConfig)
+	if err != nil {
+		if err := conn.Close(); err != nil {
+			sw.Logger.Error("Error closing connection", "err", err)
+		}
+		return err
+	}
+	peer.SetLogger(sw.Logger.With("peer", conn.RemoteAddr()))
+	if err = sw.addPeer(peer); err != nil {
+		peer.CloseConn()
+		return err
+	}
+
+	return nil
+}
+
+// StartSwitches calls sw.Start() for each given switch.
+// It returns the first encountered error.
+func StartSwitches(switches []*Switch) error {
+	for _, s := range switches {
+		err := s.Start() // start switch and reactors
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func makeSwitch(cfg *cfg.P2PConfig, i int, network, version string, initSwitch func(int, *Switch) *Switch) *Switch {
+	// new switch, add reactors
+	// TODO: let the config be passed in?
+	nodeKey := &NodeKey{
+		PrivKey: crypto.GenPrivKeyEd25519().Wrap(),
+	}
+	s := initSwitch(i, NewSwitch(cfg))
+	s.SetNodeInfo(NodeInfo{
+		PubKey:     nodeKey.PubKey(),
+		Moniker:    cmn.Fmt("switch%d", i),
+		Network:    network,
+		Version:    version,
+		ListenAddr: cmn.Fmt("%v:%v", network, rand.Intn(64512)+1023),
+	})
+	s.SetNodeKey(nodeKey)
+	s.SetLogger(log.TestingLogger())
+	return s
+}

p2p/types.go

@@ -12,18 +12,34 @@ import (
 const maxNodeInfoSize = 10240 // 10Kb
 
 // NodeInfo is the basic node information exchanged
-// between two peers during the Tendermint P2P handshake
+// between two peers during the Tendermint P2P handshake.
 type NodeInfo struct {
+	// Authenticate
 	PubKey     crypto.PubKey `json:"pub_key"`     // authenticated pubkey
-	Moniker    string        `json:"moniker"`     // arbitrary moniker
-	Network    string        `json:"network"`     // network/chain ID
 	ListenAddr string        `json:"listen_addr"` // accepting incoming
-	Version    string        `json:"version"`     // major.minor.revision
-	Other      []string      `json:"other"`       // other application specific data
+
+	// Check compatibility
+	Network string `json:"network"` // network/chain ID
+	Version string `json:"version"` // major.minor.revision
+
+	// Sanitize
+	Moniker string   `json:"moniker"` // arbitrary moniker
+	Other   []string `json:"other"`   // other application specific data
+}
+
+// Validate checks the self-reported NodeInfo is safe.
+// It returns an error if the info.PubKey doesn't match the given pubKey.
+// TODO: constraints for Moniker/Other? Or is that for the UI ?
+func (info NodeInfo) Validate(pubKey crypto.PubKey) error {
+	if !info.PubKey.Equals(pubKey) {
+		return fmt.Errorf("info.PubKey (%v) doesn't match peer.PubKey (%v)",
+			info.PubKey, pubKey)
+	}
+	return nil
 }
 
 // CONTRACT: two nodes are compatible if the major/minor versions match and network match
-func (info *NodeInfo) CompatibleWith(other *NodeInfo) error {
+func (info NodeInfo) CompatibleWith(other NodeInfo) error {
 	iMajor, iMinor, _, iErr := splitVersion(info.Version)
 	oMajor, oMinor, _, oErr := splitVersion(other.Version)
 
@@ -55,11 +71,11 @@ func (info *NodeInfo) CompatibleWith(other *NodeInfo) error {
 	return nil
 }
 
-func (info *NodeInfo) ID() ID {
+func (info NodeInfo) ID() ID {
 	return PubKeyToID(info.PubKey)
 }
 
-func (info *NodeInfo) NetAddress() *NetAddress {
+func (info NodeInfo) NetAddress() *NetAddress {
 	id := PubKeyToID(info.PubKey)
 	addr := info.ListenAddr
 	netAddr, err := NewNetAddressString(IDAddressString(id, addr))
@@ -69,12 +85,12 @@ func (info *NodeInfo) NetAddress() *NetAddress {
 	return netAddr
 }
 
-func (info *NodeInfo) ListenHost() string {
+func (info NodeInfo) ListenHost() string {
 	host, _, _ := net.SplitHostPort(info.ListenAddr) // nolint: errcheck, gas
 	return host
 }
 
-func (info *NodeInfo) ListenPort() int {
+func (info NodeInfo) ListenPort() int {
 	_, port, _ := net.SplitHostPort(info.ListenAddr) // nolint: errcheck, gas
 	port_i, err := strconv.Atoi(port)
 	if err != nil {

p2p/util.go

@@ -1,15 +0,0 @@
-package p2p
-
-import (
-	"crypto/sha256"
-)
-
-// doubleSha256 calculates sha256(sha256(b)) and returns the resulting bytes.
-func doubleSha256(b []byte) []byte {
-	hasher := sha256.New()
-	hasher.Write(b) // nolint: errcheck, gas
-	sum := hasher.Sum(nil)
-	hasher.Reset()
-	hasher.Write(sum) // nolint: errcheck, gas
-	return hasher.Sum(nil)
-}

rpc/core/net.go

@@ -41,7 +41,7 @@ func NetInfo() (*ctypes.ResultNetInfo, error) {
 	peers := []ctypes.Peer{}
 	for _, peer := range p2pSwitch.Peers().List() {
 		peers = append(peers, ctypes.Peer{
-			NodeInfo:         *peer.NodeInfo(),
+			NodeInfo:         peer.NodeInfo(),
 			IsOutbound:       peer.IsOutbound(),
 			ConnectionStatus: peer.Status(),
 		})

rpc/core/pipe.go

@@ -30,7 +30,7 @@ type P2P interface {
 	Listeners() []p2p.Listener
 	Peers() p2p.IPeerSet
 	NumPeers() (outbound, inbound, dialig int)
-	NodeInfo() *p2p.NodeInfo
+	NodeInfo() p2p.NodeInfo
 	IsListening() bool
 	DialPeersAsync(*p2p.AddrBook, []string, bool) error
 }

rpc/core/types/responses.go

@@ -54,7 +54,7 @@ func NewResultCommit(header *types.Header, commit *types.Commit,
 }
 
 type ResultStatus struct {
-	NodeInfo          *p2p.NodeInfo `json:"node_info"`
+	NodeInfo          p2p.NodeInfo  `json:"node_info"`
 	PubKey            crypto.PubKey `json:"pub_key"`
 	LatestBlockHash   data.Bytes    `json:"latest_block_hash"`
 	LatestAppHash     data.Bytes    `json:"latest_app_hash"`
@@ -64,7 +64,7 @@ type ResultStatus struct {
 }
 
 func (s *ResultStatus) TxIndexEnabled() bool {
-	if s == nil || s.NodeInfo == nil {
+	if s == nil {
 		return false
 	}
 	for _, s := range s.NodeInfo.Other {

rpc/core/types/responses_test.go

@@ -17,7 +17,7 @@ func TestStatusIndexer(t *testing.T) {
 	status = &ResultStatus{}
 	assert.False(status.TxIndexEnabled())
 
-	status.NodeInfo = &p2p.NodeInfo{}
+	status.NodeInfo = p2p.NodeInfo{}
 	assert.False(status.TxIndexEnabled())
 
 	cases := []struct {