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340 lines
9.0 KiB
340 lines
9.0 KiB
package p2p
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import (
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"context"
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"errors"
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"fmt"
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"io"
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"net"
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"sync"
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"github.com/tendermint/tendermint/crypto"
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"github.com/tendermint/tendermint/libs/log"
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"github.com/tendermint/tendermint/types"
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)
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const (
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MemoryProtocol Protocol = "memory"
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)
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// MemoryNetwork is an in-memory "network" that uses buffered Go channels to
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// communicate between endpoints. It is primarily meant for testing.
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//
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// Network endpoints are allocated via CreateTransport(), which takes a node ID,
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// and the endpoint is then immediately accessible via the URL "memory:<nodeID>".
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type MemoryNetwork struct {
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logger log.Logger
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mtx sync.RWMutex
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transports map[types.NodeID]*MemoryTransport
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bufferSize int
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}
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// NewMemoryNetwork creates a new in-memory network.
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func NewMemoryNetwork(logger log.Logger, bufferSize int) *MemoryNetwork {
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return &MemoryNetwork{
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bufferSize: bufferSize,
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logger: logger,
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transports: map[types.NodeID]*MemoryTransport{},
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}
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}
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// CreateTransport creates a new memory transport endpoint with the given node
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// ID and immediately begins listening on the address "memory:<id>". It panics
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// if the node ID is already in use (which is fine, since this is for tests).
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func (n *MemoryNetwork) CreateTransport(nodeID types.NodeID) *MemoryTransport {
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t := newMemoryTransport(n, nodeID)
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n.mtx.Lock()
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defer n.mtx.Unlock()
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if _, ok := n.transports[nodeID]; ok {
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panic(fmt.Sprintf("memory transport with node ID %q already exists", nodeID))
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}
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n.transports[nodeID] = t
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return t
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}
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// GetTransport looks up a transport in the network, returning nil if not found.
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func (n *MemoryNetwork) GetTransport(id types.NodeID) *MemoryTransport {
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n.mtx.RLock()
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defer n.mtx.RUnlock()
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return n.transports[id]
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}
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// RemoveTransport removes a transport from the network and closes it.
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func (n *MemoryNetwork) RemoveTransport(id types.NodeID) {
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n.mtx.Lock()
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t, ok := n.transports[id]
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delete(n.transports, id)
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n.mtx.Unlock()
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if ok {
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// Close may recursively call RemoveTransport() again, but this is safe
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// because we've already removed the transport from the map above.
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if err := t.Close(); err != nil {
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n.logger.Error("failed to close memory transport", "id", id, "err", err)
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}
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}
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}
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// Size returns the number of transports in the network.
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func (n *MemoryNetwork) Size() int {
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return len(n.transports)
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}
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// MemoryTransport is an in-memory transport that uses buffered Go channels to
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// communicate between endpoints. It is primarily meant for testing.
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//
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// New transports are allocated with MemoryNetwork.CreateTransport(). To contact
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// a different endpoint, both transports must be in the same MemoryNetwork.
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type MemoryTransport struct {
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logger log.Logger
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network *MemoryNetwork
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nodeID types.NodeID
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bufferSize int
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acceptCh chan *MemoryConnection
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}
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// newMemoryTransport creates a new MemoryTransport. This is for internal use by
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// MemoryNetwork, use MemoryNetwork.CreateTransport() instead.
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func newMemoryTransport(network *MemoryNetwork, nodeID types.NodeID) *MemoryTransport {
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return &MemoryTransport{
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logger: network.logger.With("local", nodeID),
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network: network,
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nodeID: nodeID,
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bufferSize: network.bufferSize,
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acceptCh: make(chan *MemoryConnection),
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}
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}
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// String implements Transport.
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func (t *MemoryTransport) String() string {
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return string(MemoryProtocol)
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}
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func (*MemoryTransport) Listen(Endpoint) error { return nil }
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func (t *MemoryTransport) AddChannelDescriptors([]*ChannelDescriptor) {}
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// Protocols implements Transport.
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func (t *MemoryTransport) Protocols() []Protocol {
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return []Protocol{MemoryProtocol}
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}
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// Endpoints implements Transport.
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func (t *MemoryTransport) Endpoints() []Endpoint {
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if n := t.network.GetTransport(t.nodeID); n == nil {
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return []Endpoint{}
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}
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return []Endpoint{{
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Protocol: MemoryProtocol,
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Path: string(t.nodeID),
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// An arbitrary IP and port is used in order for the pex
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// reactor to be able to send addresses to one another.
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IP: net.IPv4zero,
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Port: 0,
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}}
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}
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// Accept implements Transport.
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func (t *MemoryTransport) Accept(ctx context.Context) (Connection, error) {
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select {
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case conn := <-t.acceptCh:
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t.logger.Info("accepted connection", "remote", conn.RemoteEndpoint().Path)
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return conn, nil
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case <-ctx.Done():
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return nil, io.EOF
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}
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}
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// Dial implements Transport.
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func (t *MemoryTransport) Dial(ctx context.Context, endpoint Endpoint) (Connection, error) {
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if endpoint.Protocol != MemoryProtocol {
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return nil, fmt.Errorf("invalid protocol %q", endpoint.Protocol)
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}
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if endpoint.Path == "" {
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return nil, errors.New("no path")
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}
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if err := endpoint.Validate(); err != nil {
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return nil, err
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}
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nodeID, err := types.NewNodeID(endpoint.Path)
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if err != nil {
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return nil, err
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}
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t.logger.Info("dialing peer", "remote", nodeID)
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peer := t.network.GetTransport(nodeID)
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if peer == nil {
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return nil, fmt.Errorf("unknown peer %q", nodeID)
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}
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inCh := make(chan memoryMessage, t.bufferSize)
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outCh := make(chan memoryMessage, t.bufferSize)
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once := &sync.Once{}
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closeCh := make(chan struct{})
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closeFn := func() { once.Do(func() { close(closeCh) }) }
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outConn := newMemoryConnection(t.logger, t.nodeID, peer.nodeID, inCh, outCh)
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outConn.closeCh = closeCh
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outConn.closeFn = closeFn
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inConn := newMemoryConnection(peer.logger, peer.nodeID, t.nodeID, outCh, inCh)
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inConn.closeCh = closeCh
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inConn.closeFn = closeFn
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select {
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case peer.acceptCh <- inConn:
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return outConn, nil
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case <-ctx.Done():
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return nil, io.EOF
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}
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}
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// Close implements Transport.
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func (t *MemoryTransport) Close() error {
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t.network.RemoveTransport(t.nodeID)
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return nil
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}
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// MemoryConnection is an in-memory connection between two transport endpoints.
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type MemoryConnection struct {
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logger log.Logger
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localID types.NodeID
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remoteID types.NodeID
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receiveCh <-chan memoryMessage
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sendCh chan<- memoryMessage
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closeFn func()
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closeCh <-chan struct{}
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}
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// memoryMessage is passed internally, containing either a message or handshake.
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type memoryMessage struct {
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channelID ChannelID
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message []byte
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// For handshakes.
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nodeInfo *types.NodeInfo
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pubKey crypto.PubKey
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}
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// newMemoryConnection creates a new MemoryConnection.
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func newMemoryConnection(
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logger log.Logger,
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localID types.NodeID,
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remoteID types.NodeID,
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receiveCh <-chan memoryMessage,
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sendCh chan<- memoryMessage,
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) *MemoryConnection {
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return &MemoryConnection{
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logger: logger.With("remote", remoteID),
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localID: localID,
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remoteID: remoteID,
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receiveCh: receiveCh,
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sendCh: sendCh,
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}
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}
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// String implements Connection.
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func (c *MemoryConnection) String() string {
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return c.RemoteEndpoint().String()
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}
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// LocalEndpoint implements Connection.
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func (c *MemoryConnection) LocalEndpoint() Endpoint {
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return Endpoint{
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Protocol: MemoryProtocol,
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Path: string(c.localID),
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}
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}
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// RemoteEndpoint implements Connection.
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func (c *MemoryConnection) RemoteEndpoint() Endpoint {
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return Endpoint{
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Protocol: MemoryProtocol,
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Path: string(c.remoteID),
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}
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}
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// Handshake implements Connection.
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func (c *MemoryConnection) Handshake(
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ctx context.Context,
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nodeInfo types.NodeInfo,
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privKey crypto.PrivKey,
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) (types.NodeInfo, crypto.PubKey, error) {
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select {
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case c.sendCh <- memoryMessage{nodeInfo: &nodeInfo, pubKey: privKey.PubKey()}:
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c.logger.Debug("sent handshake", "nodeInfo", nodeInfo)
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case <-c.closeCh:
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return types.NodeInfo{}, nil, io.EOF
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case <-ctx.Done():
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return types.NodeInfo{}, nil, ctx.Err()
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}
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select {
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case msg := <-c.receiveCh:
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if msg.nodeInfo == nil {
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return types.NodeInfo{}, nil, errors.New("no NodeInfo in handshake")
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}
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c.logger.Debug("received handshake", "peerInfo", msg.nodeInfo)
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return *msg.nodeInfo, msg.pubKey, nil
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case <-c.closeCh:
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return types.NodeInfo{}, nil, io.EOF
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case <-ctx.Done():
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return types.NodeInfo{}, nil, ctx.Err()
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}
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}
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// ReceiveMessage implements Connection.
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func (c *MemoryConnection) ReceiveMessage(ctx context.Context) (ChannelID, []byte, error) {
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// Check close first, since channels are buffered. Otherwise, below select
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// may non-deterministically return non-error even when closed.
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select {
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case <-c.closeCh:
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return 0, nil, io.EOF
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case <-ctx.Done():
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return 0, nil, io.EOF
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default:
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}
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select {
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case msg := <-c.receiveCh:
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c.logger.Debug("received message", "chID", msg.channelID, "msg", msg.message)
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return msg.channelID, msg.message, nil
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case <-ctx.Done():
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return 0, nil, io.EOF
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case <-c.closeCh:
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return 0, nil, io.EOF
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}
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}
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// SendMessage implements Connection.
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func (c *MemoryConnection) SendMessage(ctx context.Context, chID ChannelID, msg []byte) error {
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// Check close first, since channels are buffered. Otherwise, below select
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// may non-deterministically return non-error even when closed.
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select {
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case <-c.closeCh:
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return io.EOF
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case <-ctx.Done():
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return io.EOF
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default:
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}
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select {
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case c.sendCh <- memoryMessage{channelID: chID, message: msg}:
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c.logger.Debug("sent message", "chID", chID, "msg", msg)
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return nil
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case <-ctx.Done():
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return io.EOF
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case <-c.closeCh:
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return io.EOF
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}
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}
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// Close implements Connection.
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func (c *MemoryConnection) Close() error { c.closeFn(); return nil }
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