ceremonyclient/go-libp2p/p2p/net/mock/mock_peernet.go

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2023-08-21 03:50:38 +00:00
package mocknet
import (
"bytes"
"context"
"fmt"
"math/rand"
"sync"
"github.com/libp2p/go-libp2p/core/connmgr"
"github.com/libp2p/go-libp2p/core/event"
"github.com/libp2p/go-libp2p/core/network"
"github.com/libp2p/go-libp2p/core/peer"
"github.com/libp2p/go-libp2p/core/peerstore"
ma "github.com/multiformats/go-multiaddr"
)
// peernet implements network.Network
type peernet struct {
mocknet *mocknet // parent
peer peer.ID
ps peerstore.Peerstore
emitter event.Emitter
// conns are actual live connections between peers.
// many conns could run over each link.
// **conns are NOT shared between peers**
connsByPeer map[peer.ID]map[*conn]struct{}
connsByLink map[*link]map[*conn]struct{}
// connection gater to check before dialing or accepting connections. May be nil to allow all.
gater connmgr.ConnectionGater
// implement network.Network
streamHandler network.StreamHandler
notifmu sync.Mutex
notifs map[network.Notifiee]struct{}
sync.RWMutex
}
// newPeernet constructs a new peernet
func newPeernet(m *mocknet, p peer.ID, opts PeerOptions, bus event.Bus) (*peernet, error) {
emitter, err := bus.Emitter(&event.EvtPeerConnectednessChanged{})
if err != nil {
return nil, err
}
n := &peernet{
mocknet: m,
peer: p,
ps: opts.ps,
gater: opts.gater,
emitter: emitter,
connsByPeer: map[peer.ID]map[*conn]struct{}{},
connsByLink: map[*link]map[*conn]struct{}{},
notifs: make(map[network.Notifiee]struct{}),
}
return n, nil
}
func (pn *peernet) Close() error {
// close the connections
for _, c := range pn.allConns() {
c.Close()
}
pn.emitter.Close()
return pn.ps.Close()
}
// allConns returns all the connections between this peer and others
func (pn *peernet) allConns() []*conn {
pn.RLock()
var cs []*conn
for _, csl := range pn.connsByPeer {
for c := range csl {
cs = append(cs, c)
}
}
pn.RUnlock()
return cs
}
func (pn *peernet) Peerstore() peerstore.Peerstore {
return pn.ps
}
func (pn *peernet) String() string {
return fmt.Sprintf("<mock.peernet %s - %d conns>", pn.peer, len(pn.allConns()))
}
// handleNewStream is an internal function to trigger the client's handler
func (pn *peernet) handleNewStream(s network.Stream) {
pn.RLock()
handler := pn.streamHandler
pn.RUnlock()
if handler != nil {
go handler(s)
}
}
// DialPeer attempts to establish a connection to a given peer.
// Respects the context.
func (pn *peernet) DialPeer(ctx context.Context, p peer.ID) (network.Conn, error) {
return pn.connect(p)
}
func (pn *peernet) connect(p peer.ID) (*conn, error) {
if p == pn.peer {
return nil, fmt.Errorf("attempted to dial self %s", p)
}
// first, check if we already have live connections
pn.RLock()
cs, found := pn.connsByPeer[p]
if found && len(cs) > 0 {
var chosen *conn
for c := range cs { // because cs is a map
chosen = c // select first
break
}
pn.RUnlock()
return chosen, nil
}
pn.RUnlock()
if pn.gater != nil && !pn.gater.InterceptPeerDial(p) {
log.Debugf("gater disallowed outbound connection to peer %s", p)
return nil, fmt.Errorf("%v connection gater disallowed connection to %v", pn.peer, p)
}
log.Debugf("%s (newly) dialing %s", pn.peer, p)
// ok, must create a new connection. we need a link
links := pn.mocknet.LinksBetweenPeers(pn.peer, p)
if len(links) < 1 {
return nil, fmt.Errorf("%s cannot connect to %s", pn.peer, p)
}
// if many links found, how do we select? for now, randomly...
// this would be an interesting place to test logic that can measure
// links (network interfaces) and select properly
l := links[rand.Intn(len(links))]
log.Debugf("%s dialing %s openingConn", pn.peer, p)
// create a new connection with link
return pn.openConn(p, l.(*link))
}
func (pn *peernet) openConn(r peer.ID, l *link) (*conn, error) {
lc, rc := l.newConnPair(pn)
addConnPair(pn, rc.net, lc, rc)
log.Debugf("%s opening connection to %s", pn.LocalPeer(), lc.RemotePeer())
abort := func() {
_ = lc.Close()
_ = rc.Close()
}
if pn.gater != nil && !pn.gater.InterceptAddrDial(lc.remote, lc.remoteAddr) {
abort()
return nil, fmt.Errorf("%v rejected dial to %v on addr %v", lc.local, lc.remote, lc.remoteAddr)
}
if rc.net.gater != nil && !rc.net.gater.InterceptAccept(rc) {
abort()
return nil, fmt.Errorf("%v rejected connection from %v", rc.local, rc.remote)
}
if err := checkSecureAndUpgrade(network.DirOutbound, pn.gater, lc); err != nil {
abort()
return nil, err
}
if err := checkSecureAndUpgrade(network.DirInbound, rc.net.gater, rc); err != nil {
abort()
return nil, err
}
go rc.net.remoteOpenedConn(rc)
pn.addConn(lc)
return lc, nil
}
func checkSecureAndUpgrade(dir network.Direction, gater connmgr.ConnectionGater, c *conn) error {
if gater == nil {
return nil
}
if !gater.InterceptSecured(dir, c.remote, c) {
return fmt.Errorf("%v rejected secure handshake with %v", c.local, c.remote)
}
allow, _ := gater.InterceptUpgraded(c)
if !allow {
return fmt.Errorf("%v rejected upgrade with %v", c.local, c.remote)
}
return nil
}
// addConnPair adds connection to both peernets at the same time
// must be followerd by pn1.addConn(c1) and pn2.addConn(c2)
func addConnPair(pn1, pn2 *peernet, c1, c2 *conn) {
var l1, l2 = pn1, pn2 // peernets in lock order
// bytes compare as string compare is lexicographical
if bytes.Compare([]byte(l1.LocalPeer()), []byte(l2.LocalPeer())) > 0 {
l1, l2 = l2, l1
}
l1.Lock()
l2.Lock()
add := func(pn *peernet, c *conn) {
_, found := pn.connsByPeer[c.RemotePeer()]
if !found {
pn.connsByPeer[c.RemotePeer()] = map[*conn]struct{}{}
}
pn.connsByPeer[c.RemotePeer()][c] = struct{}{}
_, found = pn.connsByLink[c.link]
if !found {
pn.connsByLink[c.link] = map[*conn]struct{}{}
}
pn.connsByLink[c.link][c] = struct{}{}
}
add(pn1, c1)
add(pn2, c2)
c1.notifLk.Lock()
c2.notifLk.Lock()
l2.Unlock()
l1.Unlock()
}
func (pn *peernet) remoteOpenedConn(c *conn) {
log.Debugf("%s accepting connection from %s", pn.LocalPeer(), c.RemotePeer())
pn.addConn(c)
}
// addConn constructs and adds a connection
// to given remote peer over given link
func (pn *peernet) addConn(c *conn) {
defer c.notifLk.Unlock()
pn.notifyAll(func(n network.Notifiee) {
n.Connected(pn, c)
})
pn.emitter.Emit(event.EvtPeerConnectednessChanged{
Peer: c.remote,
Connectedness: network.Connected,
})
}
// removeConn removes a given conn
func (pn *peernet) removeConn(c *conn) {
pn.Lock()
cs, found := pn.connsByLink[c.link]
if !found || len(cs) < 1 {
panic(fmt.Sprintf("attempting to remove a conn that doesnt exist %p", c.link))
}
delete(cs, c)
cs, found = pn.connsByPeer[c.remote]
if !found {
panic(fmt.Sprintf("attempting to remove a conn that doesnt exist %v", c.remote))
}
delete(cs, c)
pn.Unlock()
// notify asynchronously to mimic Swarm
// FIXME: IIRC, we wanted to make notify for Close synchronous
go func() {
c.notifLk.Lock()
defer c.notifLk.Unlock()
pn.notifyAll(func(n network.Notifiee) {
n.Disconnected(c.net, c)
})
}()
c.net.emitter.Emit(event.EvtPeerConnectednessChanged{
Peer: c.remote,
Connectedness: network.NotConnected,
})
}
// LocalPeer the network's LocalPeer
func (pn *peernet) LocalPeer() peer.ID {
return pn.peer
}
// Peers returns the connected peers
func (pn *peernet) Peers() []peer.ID {
pn.RLock()
defer pn.RUnlock()
peers := make([]peer.ID, 0, len(pn.connsByPeer))
for _, cs := range pn.connsByPeer {
for c := range cs {
peers = append(peers, c.remote)
break
}
}
return peers
}
// Conns returns all the connections of this peer
func (pn *peernet) Conns() []network.Conn {
pn.RLock()
defer pn.RUnlock()
out := make([]network.Conn, 0, len(pn.connsByPeer))
for _, cs := range pn.connsByPeer {
for c := range cs {
out = append(out, c)
}
}
return out
}
func (pn *peernet) ConnsToPeer(p peer.ID) []network.Conn {
pn.RLock()
defer pn.RUnlock()
cs, found := pn.connsByPeer[p]
if !found || len(cs) == 0 {
return nil
}
cs2 := make([]network.Conn, 0, len(cs))
for c := range cs {
cs2 = append(cs2, c)
}
return cs2
}
// ClosePeer connections to peer
func (pn *peernet) ClosePeer(p peer.ID) error {
pn.RLock()
cs, found := pn.connsByPeer[p]
if !found {
pn.RUnlock()
return nil
}
conns := make([]*conn, 0, len(cs))
for c := range cs {
conns = append(conns, c)
}
pn.RUnlock()
for _, c := range conns {
c.Close()
}
return nil
}
// BandwidthTotals returns the total amount of bandwidth transferred
func (pn *peernet) BandwidthTotals() (in uint64, out uint64) {
// need to implement this. probably best to do it in swarm this time.
// need a "metrics" object
return 0, 0
}
// Listen tells the network to start listening on given multiaddrs.
func (pn *peernet) Listen(addrs ...ma.Multiaddr) error {
pn.Peerstore().AddAddrs(pn.LocalPeer(), addrs, peerstore.PermanentAddrTTL)
return nil
}
// ListenAddresses returns a list of addresses at which this network listens.
func (pn *peernet) ListenAddresses() []ma.Multiaddr {
return pn.Peerstore().Addrs(pn.LocalPeer())
}
// InterfaceListenAddresses returns a list of addresses at which this network
// listens. It expands "any interface" addresses (/ip4/0.0.0.0, /ip6/::) to
// use the known local interfaces.
func (pn *peernet) InterfaceListenAddresses() ([]ma.Multiaddr, error) {
return pn.ListenAddresses(), nil
}
// Connectedness returns a state signaling connection capabilities
// For now only returns Connecter || NotConnected. Expand into more later.
func (pn *peernet) Connectedness(p peer.ID) network.Connectedness {
pn.Lock()
defer pn.Unlock()
cs, found := pn.connsByPeer[p]
if found && len(cs) > 0 {
return network.Connected
}
return network.NotConnected
}
// NewStream returns a new stream to given peer p.
// If there is no connection to p, attempts to create one.
func (pn *peernet) NewStream(ctx context.Context, p peer.ID) (network.Stream, error) {
c, err := pn.DialPeer(ctx, p)
if err != nil {
return nil, err
}
return c.NewStream(ctx)
}
// SetStreamHandler sets the new stream handler on the Network.
// This operation is thread-safe.
func (pn *peernet) SetStreamHandler(h network.StreamHandler) {
pn.Lock()
pn.streamHandler = h
pn.Unlock()
}
// Notify signs up Notifiee to receive signals when events happen
func (pn *peernet) Notify(f network.Notifiee) {
pn.notifmu.Lock()
pn.notifs[f] = struct{}{}
pn.notifmu.Unlock()
}
// StopNotify unregisters Notifiee from receiving signals
func (pn *peernet) StopNotify(f network.Notifiee) {
pn.notifmu.Lock()
delete(pn.notifs, f)
pn.notifmu.Unlock()
}
// notifyAll runs the notification function on all Notifiees
func (pn *peernet) notifyAll(notification func(f network.Notifiee)) {
pn.notifmu.Lock()
// notify synchronously to mimic Swarm
for n := range pn.notifs {
notification(n)
}
pn.notifmu.Unlock()
}
func (pn *peernet) ResourceManager() network.ResourceManager {
return &network.NullResourceManager{}
}