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transport.go
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transport.go
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//go:build !wasm
/*
Copyright 2023 Avi Zimmerman <avi.zimmerman@gmail.com>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package libp2p
import (
"fmt"
"log/slog"
"net"
"github.com/google/uuid"
"github.com/libp2p/go-libp2p/core/peer"
"github.com/libp2p/go-libp2p/core/peerstore"
drouting "github.com/libp2p/go-libp2p/p2p/discovery/routing"
"github.com/multiformats/go-multiaddr"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
"github.com/webmeshproj/webmesh/pkg/context"
"github.com/webmeshproj/webmesh/pkg/meshnet/transport"
)
// TransportOptions are options for configuring an RPC transport over libp2p.
type TransportOptions struct {
// Rendezvous is the pre-shared string to use as a rendezvous point for the DHT.
Rendezvous string
// HostOptions are options for configuring the host. These can be left
// empty if using a pre-created host.
HostOptions HostOptions
// Host is a pre-started host to use for the transport.
Host Host
// Credentials are the credentials to use for the transport.
Credentials []grpc.DialOption
}
// NewTransport returns a new transport using the underlying host. The passed addresses to Dial
// are parsed as a multiaddrs. It assumes the host's peerstore has been populated with the
// addresses before calls to Dial.
func NewTransport(host Host, credentials ...grpc.DialOption) transport.RPCTransport {
// If no credentials are provided, default to insecure credentials.
if len(credentials) == 0 {
credentials = []grpc.DialOption{grpc.WithTransportCredentials(insecure.NewCredentials())}
}
return &rpcTransport{h: host, creds: credentials}
}
// NewDiscoveryTransport returns a new RPC transport over libp2p using the IPFS DHT for discovery.
func NewDiscoveryTransport(ctx context.Context, opts TransportOptions) (transport.RPCTransport, error) {
var h DiscoveryHost
var err error
var close func()
if opts.Host != nil {
// If it's already a discovery host, just use it.
if dh, ok := opts.Host.(DiscoveryHost); ok {
h = dh
} else {
host := opts.Host
dht, err := NewDHT(ctx, host.Host(), opts.HostOptions.BootstrapPeers, opts.HostOptions.ConnectTimeout)
if err != nil {
return nil, err
}
h = &discoveryHost{
h: host,
dht: dht,
}
close = func() {
err := dht.Close()
if err != nil {
context.LoggerFrom(ctx).Error("Failed to close DHT", "error", err.Error())
}
}
}
} else {
h, err = NewDiscoveryHost(ctx, opts.HostOptions)
if err != nil {
return nil, err
}
close = func() {
err := h.Close()
if err != nil {
context.LoggerFrom(ctx).Error("Failed to close host", "error", err.Error())
}
}
}
return &rpcDiscoveryTransport{TransportOptions: opts, host: h, close: close}, nil
}
type rpcDiscoveryTransport struct {
TransportOptions
host DiscoveryHost
close func()
}
func (r *rpcDiscoveryTransport) Dial(ctx context.Context, _, _ string) (transport.RPCClientConn, error) {
log := context.LoggerFrom(ctx).With(slog.String("host-id", r.host.Host().ID().String()))
ctx = context.WithLogger(ctx, log)
rt := NewTransport(r.host, r.Credentials...)
log.Debug("Searching for peers on the DHT with our PSK", slog.String("psk", r.Rendezvous))
routingDiscovery := drouting.NewRoutingDiscovery(r.host.DHT())
peerChan, err := routingDiscovery.FindPeers(ctx, r.Rendezvous)
if err != nil {
return nil, fmt.Errorf("libp2p find peers: %w", err)
}
// Wait for a peer to connect to
log.Debug("Waiting for peer to establish connection with")
SearchPeers:
for {
select {
case <-ctx.Done():
if err != nil {
return nil, fmt.Errorf("%w: %w", err, ctx.Err())
}
return nil, ctx.Err()
case peer, ok := <-peerChan:
if !ok {
if ctx.Err() != nil {
if err != nil {
return nil, fmt.Errorf("%w: %w", err, ctx.Err())
}
return nil, fmt.Errorf("no peers found: %w", ctx.Err())
}
peerChan, err = routingDiscovery.FindPeers(ctx, r.Rendezvous)
if err != nil {
return nil, fmt.Errorf("libp2p find peers: %w", err)
}
continue SearchPeers
}
// Ignore ourselves and hosts with no addresses.
jlog := log.With(slog.String("peer-id", peer.ID.String()), slog.Any("peer-addrs", peer.Addrs))
if peer.ID == r.host.Host().ID() || len(peer.Addrs) == 0 {
jlog.Debug("Ignoring peer")
continue
}
for _, addr := range peer.Addrs {
jlog.Debug("Dialing peer", slog.String("address", addr.String()))
var connCtx context.Context
var cancel context.CancelFunc
if r.HostOptions.ConnectTimeout > 0 {
connCtx, cancel = context.WithTimeout(ctx, r.HostOptions.ConnectTimeout)
} else {
connCtx, cancel = context.WithCancel(ctx)
}
c, err := rt.Dial(connCtx, string(peer.ID), addr.String())
cancel()
if err == nil {
return c, nil
}
jlog.Debug("Failed to dial peer", "error", err)
}
}
}
}
func (r *rpcDiscoveryTransport) Close() error {
r.close()
return nil
}
type rpcTransport struct {
h Host
creds []grpc.DialOption
}
func (r *rpcTransport) Dial(ctx context.Context, id, address string) (transport.RPCClientConn, error) {
pid := peer.ID(id)
// Fastpath if we are using an uncertified peer store. We can add the address
// to the peerstore and dial directly. This saves the caller some work.
if _, ok := r.h.Host().Peerstore().(*UncertifiedPeerstore); ok {
if pid != "" {
ma, err := multiaddr.NewMultiaddr(address)
if err != nil {
return nil, fmt.Errorf("parse multiaddr: %w", err)
}
r.h.Host().Peerstore().AddAddr(pid, ma, peerstore.PermanentAddrTTL)
stream, err := r.h.Host().NewStream(ctx, pid, RPCProtocol)
if err != nil {
return nil, fmt.Errorf("new stream: %w", err)
}
return grpc.DialContext(ctx, "", append(r.creds, grpc.WithContextDialer(func(ctx context.Context, s string) (net.Conn, error) {
return NewConnFromStream(stream), nil
}))...)
} else {
// Generate a temporary peer ID and dial the address.
id, err := uuid.NewRandom()
if err != nil {
return nil, fmt.Errorf("generate random uuid: %w", err)
}
pid = peer.ID(id[:])
ma, err := multiaddr.NewMultiaddr(address)
if err != nil {
return nil, fmt.Errorf("parse multiaddr: %w", err)
}
r.h.Host().Peerstore().AddAddr(pid, ma, peerstore.PermanentAddrTTL)
defer r.h.Host().Peerstore().ClearAddrs(pid)
stream, err := r.h.Host().NewStream(ctx, pid, RPCProtocol)
if err != nil {
return nil, fmt.Errorf("new stream: %w", err)
}
return grpc.DialContext(ctx, "", append(r.creds, grpc.WithContextDialer(func(ctx context.Context, s string) (net.Conn, error) {
return NewConnFromStream(stream), nil
}))...)
}
}
// Next if we don't have an address but have an id, or have both, just dial the peer and
// let the peerstore handle the rest.
if (address == "" && id != "") || (address != "" && id != "") {
stream, err := r.h.Host().NewStream(ctx, pid, RPCProtocol)
if err != nil {
return nil, fmt.Errorf("new stream: %w", err)
}
return grpc.DialContext(ctx, "", append(r.creds, grpc.WithContextDialer(func(ctx context.Context, s string) (net.Conn, error) {
return NewConnFromStream(stream), nil
}))...)
}
// Try to find the peer with the given address.
ma, err := multiaddr.NewMultiaddr(address)
if err != nil {
return nil, fmt.Errorf("parse multiaddr: %w", err)
}
peers := r.h.Host().Peerstore().PeersWithAddrs()
for _, pid := range peers {
addrs := r.h.Host().Peerstore().Addrs(pid)
for _, addr := range addrs {
if !addr.Equal(ma) {
continue
}
stream, err := r.h.Host().NewStream(ctx, pid, RPCProtocol)
if err != nil {
return nil, fmt.Errorf("new stream: %w", err)
}
return grpc.DialContext(ctx, "", append(r.creds, grpc.WithContextDialer(func(ctx context.Context, s string) (net.Conn, error) {
return NewConnFromStream(stream), nil
}))...)
}
}
return nil, fmt.Errorf("no peer found to dial with id %q and address %q", pid.String(), address)
}