You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
369 lines
9.5 KiB
369 lines
9.5 KiB
package p2p
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"sync"
|
|
|
|
"github.com/tendermint/tendermint/crypto"
|
|
"github.com/tendermint/tendermint/libs/log"
|
|
tmsync "github.com/tendermint/tendermint/libs/sync"
|
|
"github.com/tendermint/tendermint/p2p/conn"
|
|
)
|
|
|
|
const (
|
|
MemoryProtocol Protocol = "memory"
|
|
)
|
|
|
|
// MemoryNetwork is an in-memory "network" that uses Go channels to communicate
|
|
// between endpoints. Transport endpoints are created with CreateTransport. It
|
|
// is primarily used for testing.
|
|
type MemoryNetwork struct {
|
|
logger log.Logger
|
|
|
|
mtx sync.RWMutex
|
|
transports map[NodeID]*MemoryTransport
|
|
}
|
|
|
|
// NewMemoryNetwork creates a new in-memory network.
|
|
func NewMemoryNetwork(logger log.Logger) *MemoryNetwork {
|
|
return &MemoryNetwork{
|
|
logger: logger,
|
|
transports: map[NodeID]*MemoryTransport{},
|
|
}
|
|
}
|
|
|
|
// CreateTransport creates a new memory transport and endpoint with the given
|
|
// node ID. It immediately begins listening on the endpoint "memory:<id>", and
|
|
// can be accessed by other transports in the same memory network.
|
|
func (n *MemoryNetwork) CreateTransport(nodeID NodeID) (*MemoryTransport, error) {
|
|
t := newMemoryTransport(n, nodeID)
|
|
|
|
n.mtx.Lock()
|
|
defer n.mtx.Unlock()
|
|
if _, ok := n.transports[nodeID]; ok {
|
|
return nil, fmt.Errorf("transport with node ID %q already exists", nodeID)
|
|
}
|
|
n.transports[nodeID] = t
|
|
return t, nil
|
|
}
|
|
|
|
// GetTransport looks up a transport in the network, returning nil if not found.
|
|
func (n *MemoryNetwork) GetTransport(id NodeID) *MemoryTransport {
|
|
n.mtx.RLock()
|
|
defer n.mtx.RUnlock()
|
|
return n.transports[id]
|
|
}
|
|
|
|
// RemoveTransport removes a transport from the network and closes it.
|
|
func (n *MemoryNetwork) RemoveTransport(id NodeID) error {
|
|
n.mtx.Lock()
|
|
t, ok := n.transports[id]
|
|
delete(n.transports, id)
|
|
n.mtx.Unlock()
|
|
|
|
if ok {
|
|
// Close may recursively call RemoveTransport() again, but this is safe
|
|
// because we've already removed the transport from the map above.
|
|
return t.Close()
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// MemoryTransport is an in-memory transport that's primarily meant for testing.
|
|
// It communicates between endpoints using Go channels. To dial a different
|
|
// endpoint, both endpoints/transports must be in the same MemoryNetwork.
|
|
type MemoryTransport struct {
|
|
network *MemoryNetwork
|
|
nodeID NodeID
|
|
logger log.Logger
|
|
|
|
acceptCh chan *MemoryConnection
|
|
closeCh chan struct{}
|
|
closeOnce sync.Once
|
|
}
|
|
|
|
// newMemoryTransport creates a new in-memory transport in the given network.
|
|
// Callers should use MemoryNetwork.CreateTransport() or GenerateTransport()
|
|
// to create transports, this is for internal use by MemoryNetwork.
|
|
func newMemoryTransport(network *MemoryNetwork, nodeID NodeID) *MemoryTransport {
|
|
return &MemoryTransport{
|
|
network: network,
|
|
nodeID: nodeID,
|
|
logger: network.logger.With("local", fmt.Sprintf("%v:%v", MemoryProtocol, nodeID)),
|
|
|
|
acceptCh: make(chan *MemoryConnection),
|
|
closeCh: make(chan struct{}),
|
|
}
|
|
}
|
|
|
|
// String displays the transport.
|
|
func (t *MemoryTransport) String() string {
|
|
return string(MemoryProtocol)
|
|
}
|
|
|
|
// Protocols implements Transport.
|
|
func (t *MemoryTransport) Protocols() []Protocol {
|
|
return []Protocol{MemoryProtocol}
|
|
}
|
|
|
|
// Accept implements Transport.
|
|
func (t *MemoryTransport) Accept(ctx context.Context) (Connection, error) {
|
|
select {
|
|
case conn := <-t.acceptCh:
|
|
t.logger.Info("accepted connection from peer", "remote", conn.RemoteEndpoint())
|
|
return conn, nil
|
|
case <-t.closeCh:
|
|
return nil, io.EOF
|
|
case <-ctx.Done():
|
|
return nil, ctx.Err()
|
|
}
|
|
}
|
|
|
|
// Dial implements Transport.
|
|
func (t *MemoryTransport) Dial(ctx context.Context, endpoint Endpoint) (Connection, error) {
|
|
if endpoint.Protocol != MemoryProtocol {
|
|
return nil, fmt.Errorf("invalid protocol %q", endpoint.Protocol)
|
|
}
|
|
if endpoint.Path == "" {
|
|
return nil, errors.New("no path")
|
|
}
|
|
nodeID, err := NewNodeID(endpoint.Path)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
t.logger.Info("dialing peer", "remote", endpoint)
|
|
|
|
peerTransport := t.network.GetTransport(nodeID)
|
|
if peerTransport == nil {
|
|
return nil, fmt.Errorf("unknown peer %q", nodeID)
|
|
}
|
|
inCh := make(chan memoryMessage, 1)
|
|
outCh := make(chan memoryMessage, 1)
|
|
closer := tmsync.NewCloser()
|
|
|
|
outConn := newMemoryConnection(t, peerTransport, inCh, outCh, closer)
|
|
inConn := newMemoryConnection(peerTransport, t, outCh, inCh, closer)
|
|
|
|
select {
|
|
case peerTransport.acceptCh <- inConn:
|
|
return outConn, nil
|
|
case <-peerTransport.closeCh:
|
|
return nil, ErrTransportClosed{}
|
|
case <-ctx.Done():
|
|
return nil, ctx.Err()
|
|
}
|
|
}
|
|
|
|
// DialAccept is a convenience function that dials a peer MemoryTransport and
|
|
// returns both ends of the connection (A to B and B to A).
|
|
func (t *MemoryTransport) DialAccept(
|
|
ctx context.Context,
|
|
peer *MemoryTransport,
|
|
) (Connection, Connection, error) {
|
|
endpoints := peer.Endpoints()
|
|
if len(endpoints) == 0 {
|
|
return nil, nil, fmt.Errorf("peer %q not listening on any endpoints", peer.nodeID)
|
|
}
|
|
|
|
acceptCh := make(chan Connection, 1)
|
|
errCh := make(chan error, 1)
|
|
go func() {
|
|
conn, err := peer.Accept(ctx)
|
|
errCh <- err
|
|
acceptCh <- conn
|
|
}()
|
|
|
|
outConn, err := t.Dial(ctx, endpoints[0])
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
if err = <-errCh; err != nil {
|
|
return nil, nil, err
|
|
}
|
|
inConn := <-acceptCh
|
|
|
|
return outConn, inConn, nil
|
|
}
|
|
|
|
// Close implements Transport.
|
|
func (t *MemoryTransport) Close() error {
|
|
err := t.network.RemoveTransport(t.nodeID)
|
|
t.closeOnce.Do(func() {
|
|
close(t.closeCh)
|
|
})
|
|
t.logger.Info("stopped accepting connections")
|
|
return err
|
|
}
|
|
|
|
// Endpoints implements Transport.
|
|
func (t *MemoryTransport) Endpoints() []Endpoint {
|
|
select {
|
|
case <-t.closeCh:
|
|
return []Endpoint{}
|
|
default:
|
|
return []Endpoint{{
|
|
Protocol: MemoryProtocol,
|
|
Path: string(t.nodeID),
|
|
}}
|
|
}
|
|
}
|
|
|
|
// MemoryConnection is an in-memory connection between two transports (nodes).
|
|
type MemoryConnection struct {
|
|
logger log.Logger
|
|
local *MemoryTransport
|
|
remote *MemoryTransport
|
|
|
|
receiveCh <-chan memoryMessage
|
|
sendCh chan<- memoryMessage
|
|
closer *tmsync.Closer
|
|
}
|
|
|
|
// memoryMessage is used to pass messages internally in the connection.
|
|
// For handshakes, nodeInfo and pubKey are set instead of channel and message.
|
|
type memoryMessage struct {
|
|
channel byte
|
|
message []byte
|
|
|
|
// For handshakes.
|
|
nodeInfo NodeInfo
|
|
pubKey crypto.PubKey
|
|
}
|
|
|
|
// newMemoryConnection creates a new MemoryConnection. It takes all channels
|
|
// (including the closeCh signal channel) on construction, such that they can be
|
|
// shared between both ends of the connection.
|
|
func newMemoryConnection(
|
|
local *MemoryTransport,
|
|
remote *MemoryTransport,
|
|
receiveCh <-chan memoryMessage,
|
|
sendCh chan<- memoryMessage,
|
|
closer *tmsync.Closer,
|
|
) *MemoryConnection {
|
|
c := &MemoryConnection{
|
|
local: local,
|
|
remote: remote,
|
|
receiveCh: receiveCh,
|
|
sendCh: sendCh,
|
|
closer: closer,
|
|
}
|
|
c.logger = c.local.logger.With("remote", c.RemoteEndpoint())
|
|
return c
|
|
}
|
|
|
|
// Handshake implements Connection.
|
|
func (c *MemoryConnection) Handshake(
|
|
ctx context.Context,
|
|
nodeInfo NodeInfo,
|
|
privKey crypto.PrivKey,
|
|
) (NodeInfo, crypto.PubKey, error) {
|
|
select {
|
|
case c.sendCh <- memoryMessage{nodeInfo: nodeInfo, pubKey: privKey.PubKey()}:
|
|
case <-ctx.Done():
|
|
return NodeInfo{}, nil, ctx.Err()
|
|
case <-c.closer.Done():
|
|
return NodeInfo{}, nil, io.EOF
|
|
}
|
|
|
|
select {
|
|
case msg := <-c.receiveCh:
|
|
c.logger.Debug("handshake complete")
|
|
return msg.nodeInfo, msg.pubKey, nil
|
|
case <-ctx.Done():
|
|
return NodeInfo{}, nil, ctx.Err()
|
|
case <-c.closer.Done():
|
|
return NodeInfo{}, nil, io.EOF
|
|
}
|
|
}
|
|
|
|
// ReceiveMessage implements Connection.
|
|
func (c *MemoryConnection) ReceiveMessage() (chID byte, msg []byte, err error) {
|
|
// check close first, since channels are buffered
|
|
select {
|
|
case <-c.closer.Done():
|
|
return 0, nil, io.EOF
|
|
default:
|
|
}
|
|
|
|
select {
|
|
case msg := <-c.receiveCh:
|
|
c.logger.Debug("received message", "channel", msg.channel, "message", msg.message)
|
|
return msg.channel, msg.message, nil
|
|
case <-c.closer.Done():
|
|
return 0, nil, io.EOF
|
|
}
|
|
}
|
|
|
|
// SendMessage implements Connection.
|
|
func (c *MemoryConnection) SendMessage(chID byte, msg []byte) (bool, error) {
|
|
// check close first, since channels are buffered
|
|
select {
|
|
case <-c.closer.Done():
|
|
return false, io.EOF
|
|
default:
|
|
}
|
|
|
|
select {
|
|
case c.sendCh <- memoryMessage{channel: chID, message: msg}:
|
|
c.logger.Debug("sent message", "channel", chID, "message", msg)
|
|
return true, nil
|
|
case <-c.closer.Done():
|
|
return false, io.EOF
|
|
}
|
|
}
|
|
|
|
// TrySendMessage implements Connection.
|
|
func (c *MemoryConnection) TrySendMessage(chID byte, msg []byte) (bool, error) {
|
|
// check close first, since channels are buffered
|
|
select {
|
|
case <-c.closer.Done():
|
|
return false, io.EOF
|
|
default:
|
|
}
|
|
|
|
select {
|
|
case c.sendCh <- memoryMessage{channel: chID, message: msg}:
|
|
c.logger.Debug("sent message", "channel", chID, "message", msg)
|
|
return true, nil
|
|
case <-c.closer.Done():
|
|
return false, io.EOF
|
|
default:
|
|
return false, nil
|
|
}
|
|
}
|
|
|
|
// Close closes the connection.
|
|
func (c *MemoryConnection) Close() error {
|
|
c.closer.Close()
|
|
c.logger.Info("closed connection")
|
|
return nil
|
|
}
|
|
|
|
// FlushClose flushes all pending sends and then closes the connection.
|
|
func (c *MemoryConnection) FlushClose() error {
|
|
return c.Close()
|
|
}
|
|
|
|
// LocalEndpoint returns the local endpoint for the connection.
|
|
func (c *MemoryConnection) LocalEndpoint() Endpoint {
|
|
return Endpoint{
|
|
Protocol: MemoryProtocol,
|
|
Path: string(c.local.nodeID),
|
|
}
|
|
}
|
|
|
|
// RemoteEndpoint returns the remote endpoint for the connection.
|
|
func (c *MemoryConnection) RemoteEndpoint() Endpoint {
|
|
return Endpoint{
|
|
Protocol: MemoryProtocol,
|
|
Path: string(c.remote.nodeID),
|
|
}
|
|
}
|
|
|
|
// Status returns the current connection status.
|
|
func (c *MemoryConnection) Status() conn.ConnectionStatus {
|
|
return conn.ConnectionStatus{}
|
|
}
|