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server.go
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server.go
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package supernode
import (
"errors"
"fmt"
datastore "github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/ipfs/go-datastore"
proto "gx/ipfs/QmZ4Qi3GaRbjcx28Sme5eMH7RQjGkt8wHxt2a65oLaeFEV/gogo-protobuf/proto"
context "gx/ipfs/QmZy2y8t9zQH2a1b8q2ZSLKp17ATuJoCNxxyMFG5qFExpt/go-net/context"
key "github.com/ipfs/go-ipfs/blocks/key"
dhtpb "github.com/ipfs/go-ipfs/routing/dht/pb"
record "github.com/ipfs/go-ipfs/routing/record"
proxy "github.com/ipfs/go-ipfs/routing/supernode/proxy"
peer "gx/ipfs/QmbyvM8zRFDkbFdYyt1MnevUMJ62SiSGbfDFZ3Z8nkrzr4/go-libp2p-peer"
)
// Server handles routing queries using a database backend
type Server struct {
local peer.ID
routingBackend datastore.Datastore
peerstore peer.Peerstore
*proxy.Loopback // so server can be injected into client
}
// NewServer creates a new Supernode routing Server
func NewServer(ds datastore.Datastore, ps peer.Peerstore, local peer.ID) (*Server, error) {
s := &Server{local, ds, ps, nil}
s.Loopback = &proxy.Loopback{
Handler: s,
Local: local,
}
return s, nil
}
func (_ *Server) Bootstrap(ctx context.Context) error {
return nil
}
// HandleLocalRequest implements the proxy.RequestHandler interface. This is
// where requests are received from the outside world.
func (s *Server) HandleRequest(ctx context.Context, p peer.ID, req *dhtpb.Message) *dhtpb.Message {
_, response := s.handleMessage(ctx, p, req) // ignore response peer. it's local.
return response
}
func (s *Server) handleMessage(
ctx context.Context, p peer.ID, req *dhtpb.Message) (peer.ID, *dhtpb.Message) {
defer log.EventBegin(ctx, "routingMessageReceived", req, p).Done()
var response = dhtpb.NewMessage(req.GetType(), req.GetKey(), req.GetClusterLevel())
switch req.GetType() {
case dhtpb.Message_GET_VALUE:
rawRecord, err := getRoutingRecord(s.routingBackend, key.Key(req.GetKey()))
if err != nil {
return "", nil
}
response.Record = rawRecord
return p, response
case dhtpb.Message_PUT_VALUE:
// FIXME: verify complains that the peer's ID is not present in the
// peerstore. Mocknet problem?
// if err := verify(s.peerstore, req.GetRecord()); err != nil {
// log.Event(ctx, "validationFailed", req, p)
// return "", nil
// }
putRoutingRecord(s.routingBackend, key.Key(req.GetKey()), req.GetRecord())
return p, req
case dhtpb.Message_FIND_NODE:
p := s.peerstore.PeerInfo(peer.ID(req.GetKey()))
pri := []dhtpb.PeerRoutingInfo{
{
PeerInfo: p,
// Connectedness: TODO
},
}
response.CloserPeers = dhtpb.PeerRoutingInfosToPBPeers(pri)
return p.ID, response
case dhtpb.Message_ADD_PROVIDER:
for _, provider := range req.GetProviderPeers() {
providerID := peer.ID(provider.GetId())
if providerID == p {
store := []*dhtpb.Message_Peer{provider}
storeProvidersToPeerstore(s.peerstore, p, store)
if err := putRoutingProviders(s.routingBackend, key.Key(req.GetKey()), store); err != nil {
return "", nil
}
} else {
log.Event(ctx, "addProviderBadRequest", p, req)
}
}
return "", nil
case dhtpb.Message_GET_PROVIDERS:
providers, err := getRoutingProviders(s.routingBackend, key.Key(req.GetKey()))
if err != nil {
return "", nil
}
response.ProviderPeers = providers
return p, response
case dhtpb.Message_PING:
return p, req
default:
}
return "", nil
}
var _ proxy.RequestHandler = &Server{}
var _ proxy.Proxy = &Server{}
func getRoutingRecord(ds datastore.Datastore, k key.Key) (*dhtpb.Record, error) {
dskey := k.DsKey()
val, err := ds.Get(dskey)
if err != nil {
return nil, err
}
recordBytes, ok := val.([]byte)
if !ok {
return nil, fmt.Errorf("datastore had non byte-slice value for %v", dskey)
}
var record dhtpb.Record
if err := proto.Unmarshal(recordBytes, &record); err != nil {
return nil, errors.New("failed to unmarshal dht record from datastore")
}
return &record, nil
}
func putRoutingRecord(ds datastore.Datastore, k key.Key, value *dhtpb.Record) error {
data, err := proto.Marshal(value)
if err != nil {
return err
}
dskey := k.DsKey()
// TODO namespace
if err := ds.Put(dskey, data); err != nil {
return err
}
return nil
}
func putRoutingProviders(ds datastore.Datastore, k key.Key, newRecords []*dhtpb.Message_Peer) error {
log.Event(context.Background(), "putRoutingProviders", &k)
oldRecords, err := getRoutingProviders(ds, k)
if err != nil {
return err
}
mergedRecords := make(map[string]*dhtpb.Message_Peer)
for _, provider := range oldRecords {
mergedRecords[provider.GetId()] = provider // add original records
}
for _, provider := range newRecords {
mergedRecords[provider.GetId()] = provider // overwrite old record if new exists
}
var protomsg dhtpb.Message
protomsg.ProviderPeers = make([]*dhtpb.Message_Peer, 0, len(mergedRecords))
for _, provider := range mergedRecords {
protomsg.ProviderPeers = append(protomsg.ProviderPeers, provider)
}
data, err := proto.Marshal(&protomsg)
if err != nil {
return err
}
return ds.Put(providerKey(k), data)
}
func storeProvidersToPeerstore(ps peer.Peerstore, p peer.ID, providers []*dhtpb.Message_Peer) {
for _, provider := range providers {
providerID := peer.ID(provider.GetId())
if providerID != p {
log.Errorf("provider message came from third-party %s", p)
continue
}
for _, maddr := range provider.Addresses() {
// as a router, we want to store addresses for peers who have provided
ps.AddAddr(p, maddr, peer.AddressTTL)
}
}
}
func getRoutingProviders(ds datastore.Datastore, k key.Key) ([]*dhtpb.Message_Peer, error) {
e := log.EventBegin(context.Background(), "getProviders", &k)
defer e.Done()
var providers []*dhtpb.Message_Peer
if v, err := ds.Get(providerKey(k)); err == nil {
if data, ok := v.([]byte); ok {
var msg dhtpb.Message
if err := proto.Unmarshal(data, &msg); err != nil {
return nil, err
}
providers = append(providers, msg.GetProviderPeers()...)
}
}
return providers, nil
}
func providerKey(k key.Key) datastore.Key {
return datastore.KeyWithNamespaces([]string{"routing", "providers", k.String()})
}
func verify(ps peer.Peerstore, r *dhtpb.Record) error {
v := make(record.Validator)
v["pk"] = record.PublicKeyValidator
p := peer.ID(r.GetAuthor())
pk := ps.PubKey(p)
if pk == nil {
return fmt.Errorf("do not have public key for %s", p)
}
if err := record.CheckRecordSig(r, pk); err != nil {
return err
}
if err := v.VerifyRecord(r); err != nil {
return err
}
return nil
}