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standard.go
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standard.go
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package proxy
import (
"context"
"errors"
logging "gx/ipfs/QmSpJByNKFX1sCsHBEp3R73FL4NF6FnQTEGyNAXHm2GS52/go-log"
kbucket "gx/ipfs/QmTxn7JEA8DiBvd9vVzErAzadHn6TwjCKTjjUfPyRH9wjZ/go-libp2p-kbucket"
inet "gx/ipfs/QmVtMT3fD7DzQNW7hdm6Xe6KPstzcggrhNpeVZ4422UpKK/go-libp2p-net"
peer "gx/ipfs/QmWUswjn261LSyVxWAEpMVtPdy8zmKBJJfBpG3Qdpa8ZsE/go-libp2p-peer"
loggables "gx/ipfs/QmXs1igHHEaUmMxKtbP8Z9wTjitQ75sqxaKQP4QgnLN4nn/go-libp2p-loggables"
host "gx/ipfs/QmXzeAcmKDTfNZQBiyF22hQKuTK7P5z6MBBQLTk9bbiSUc/go-libp2p-host"
ggio "gx/ipfs/QmZ4Qi3GaRbjcx28Sme5eMH7RQjGkt8wHxt2a65oLaeFEV/gogo-protobuf/io"
dhtpb "gx/ipfs/QmaoxFZcgwGyoB57pCYQobejLoNgqaA6trr3zxxrbm4UXe/go-libp2p-kad-dht/pb"
pstore "gx/ipfs/Qme1g4e3m2SmdiSGGU3vSWmUStwUjc5oECnEriaK9Xa1HU/go-libp2p-peerstore"
)
const ProtocolSNR = "/ipfs/supernoderouting"
var log = logging.Logger("supernode/proxy")
type Proxy interface {
Bootstrap(context.Context) error
HandleStream(inet.Stream)
SendMessage(ctx context.Context, m *dhtpb.Message) error
SendRequest(ctx context.Context, m *dhtpb.Message) (*dhtpb.Message, error)
}
type standard struct {
Host host.Host
remoteInfos []pstore.PeerInfo // addr required for bootstrapping
remoteIDs []peer.ID // []ID is required for each req. here, cached for performance.
}
func Standard(h host.Host, remotes []pstore.PeerInfo) Proxy {
var ids []peer.ID
for _, remote := range remotes {
ids = append(ids, remote.ID)
}
return &standard{h, remotes, ids}
}
func (px *standard) Bootstrap(ctx context.Context) error {
var cxns []pstore.PeerInfo
for _, info := range px.remoteInfos {
if err := px.Host.Connect(ctx, info); err != nil {
continue
}
cxns = append(cxns, info)
}
if len(cxns) == 0 {
log.Error("unable to bootstrap to any supernode routers")
} else {
log.Infof("bootstrapped to %d supernode routers: %s", len(cxns), cxns)
}
return nil
}
func (p *standard) HandleStream(s inet.Stream) {
// TODO(brian): Should clients be able to satisfy requests?
log.Error("supernode client received (dropped) a routing message from", s.Conn().RemotePeer())
s.Close()
}
const replicationFactor = 2
// SendMessage sends message to each remote sequentially (randomized order),
// stopping after the first successful response. If all fail, returns the last
// error.
func (px *standard) SendMessage(ctx context.Context, m *dhtpb.Message) error {
var err error
var numSuccesses int
for _, remote := range sortedByKey(px.remoteIDs, m.GetKey()) {
if err = px.sendMessage(ctx, m, remote); err != nil { // careful don't re-declare err!
continue
}
numSuccesses++
switch m.GetType() {
case dhtpb.Message_ADD_PROVIDER, dhtpb.Message_PUT_VALUE:
if numSuccesses < replicationFactor {
continue
}
}
return nil // success
}
return err // NB: returns the last error
}
func (px *standard) sendMessage(ctx context.Context, m *dhtpb.Message, remote peer.ID) (err error) {
e := log.EventBegin(ctx, "sendRoutingMessage", px.Host.ID(), remote, m)
defer func() {
if err != nil {
e.SetError(err)
}
e.Done()
}()
if err = px.Host.Connect(ctx, pstore.PeerInfo{ID: remote}); err != nil {
return err
}
s, err := px.Host.NewStream(ctx, remote, ProtocolSNR)
if err != nil {
return err
}
defer s.Close()
pbw := ggio.NewDelimitedWriter(s)
if err := pbw.WriteMsg(m); err != nil {
return err
}
return nil
}
// SendRequest sends the request to each remote sequentially (randomized order),
// stopping after the first successful response. If all fail, returns the last
// error.
func (px *standard) SendRequest(ctx context.Context, m *dhtpb.Message) (*dhtpb.Message, error) {
var err error
for _, remote := range sortedByKey(px.remoteIDs, m.GetKey()) {
var reply *dhtpb.Message
reply, err = px.sendRequest(ctx, m, remote) // careful don't redeclare err!
if err != nil {
continue
}
return reply, nil // success
}
return nil, err // NB: returns the last error
}
func (px *standard) sendRequest(ctx context.Context, m *dhtpb.Message, remote peer.ID) (*dhtpb.Message, error) {
e := log.EventBegin(ctx, "sendRoutingRequest", px.Host.ID(), remote, logging.Pair("request", m))
defer e.Done()
if err := px.Host.Connect(ctx, pstore.PeerInfo{ID: remote}); err != nil {
e.SetError(err)
return nil, err
}
s, err := px.Host.NewStream(ctx, remote, ProtocolSNR)
if err != nil {
e.SetError(err)
return nil, err
}
defer s.Close()
r := ggio.NewDelimitedReader(s, inet.MessageSizeMax)
w := ggio.NewDelimitedWriter(s)
if err = w.WriteMsg(m); err != nil {
e.SetError(err)
return nil, err
}
response := &dhtpb.Message{}
if err = r.ReadMsg(response); err != nil {
e.SetError(err)
return nil, err
}
// need ctx expiration?
if response == nil {
err := errors.New("no response to request")
e.SetError(err)
return nil, err
}
e.Append(logging.Pair("response", response))
e.Append(logging.Pair("uuid", loggables.Uuid("foo")))
return response, nil
}
func sortedByKey(peers []peer.ID, skey string) []peer.ID {
target := kbucket.ConvertKey(skey)
return kbucket.SortClosestPeers(peers, target)
}