// putProvider sends a message to peer 'p' saying that the local node
// can provide the value of 'key'
func (dht *IpfsDHT) putProvider(ctx context.Context, p peer.ID, skey string) error {
// add self as the provider
pi := peer.PeerInfo{
ID: dht.self,
Addrs: dht.host.Addrs(),
}
// // only share WAN-friendly addresses ??
// pi.Addrs = addrutil.WANShareableAddrs(pi.Addrs)
if len(pi.Addrs) < 1 {
// log.Infof("%s putProvider: %s for %s error: no wan-friendly addresses", dht.self, p, key.Key(key), pi.Addrs)
return fmt.Errorf("no known addresses for self. cannot put provider.")
}
pmes := pb.NewMessage(pb.Message_ADD_PROVIDER, skey, 0)
pmes.ProviderPeers = pb.RawPeerInfosToPBPeers([]peer.PeerInfo{pi})
err := dht.sendMessage(ctx, p, pmes)
if err != nil {
return err
}
log.Debugf("%s putProvider: %s for %s (%s)", dht.self, p, key.Key(skey), pi.Addrs)
return nil
}
// getValueSingle simply performs the get value RPC with the given parameters
func (dht *IpfsDHT) getValueSingle(ctx context.Context, p peer.ID,
key key.Key) (*pb.Message, error) {
defer log.EventBegin(ctx, "getValueSingle", p, &key).Done()
pmes := pb.NewMessage(pb.Message_GET_VALUE, string(key), 0)
return dht.sendRequest(ctx, p, pmes)
}
func (dht *IpfsDHT) handleFindPeer(ctx context.Context, p peer.ID, pmes *pb.Message) (*pb.Message, error) {
defer log.EventBegin(ctx, "handleFindPeer", p).Done()
resp := pb.NewMessage(pmes.GetType(), "", pmes.GetClusterLevel())
var closest []peer.ID
// if looking for self... special case where we send it on CloserPeers.
if peer.ID(pmes.GetKey()) == dht.self {
closest = []peer.ID{dht.self}
} else {
closest = dht.betterPeersToQuery(pmes, p, CloserPeerCount)
}
if closest == nil {
log.Infof("%s handleFindPeer %s: could not find anything.", dht.self, p)
return resp, nil
}
var withAddresses []peer.PeerInfo
closestinfos := peer.PeerInfos(dht.peerstore, closest)
for _, pi := range closestinfos {
if len(pi.Addrs) > 0 {
withAddresses = append(withAddresses, pi)
log.Debugf("handleFindPeer: sending back '%s'", pi.ID)
}
}
resp.CloserPeers = pb.PeerInfosToPBPeers(dht.host.Network(), withAddresses)
return resp, nil
}
func (c *Client) GetValue(ctx context.Context, k key.Key) ([]byte, error) {
defer log.EventBegin(ctx, "getValue", &k).Done()
msg := pb.NewMessage(pb.Message_GET_VALUE, string(k), 0)
response, err := c.proxy.SendRequest(ctx, msg) // TODO wrap to hide the remote
if err != nil {
return nil, err
}
return response.Record.GetValue(), nil
}
func (c *Client) PutValue(ctx context.Context, k key.Key, v []byte) error {
defer log.EventBegin(ctx, "putValue", &k).Done()
r, err := makeRecord(c.peerstore, c.local, k, v)
if err != nil {
return err
}
pmes := pb.NewMessage(pb.Message_PUT_VALUE, string(k), 0)
pmes.Record = r
return c.proxy.SendMessage(ctx, pmes) // wrap to hide the remote
}
func (c *Client) FindPeer(ctx context.Context, id peer.ID) (peer.PeerInfo, error) {
defer log.EventBegin(ctx, "findPeer", id).Done()
request := pb.NewMessage(pb.Message_FIND_NODE, string(id), 0)
response, err := c.proxy.SendRequest(ctx, request) // hide remote
if err != nil {
return peer.PeerInfo{}, err
}
for _, p := range pb.PBPeersToPeerInfos(response.GetCloserPeers()) {
if p.ID == id {
return p, nil
}
}
return peer.PeerInfo{}, errors.New("could not find peer")
}
func (c *Client) Provide(ctx context.Context, k key.Key) error {
defer log.EventBegin(ctx, "provide", &k).Done()
msg := pb.NewMessage(pb.Message_ADD_PROVIDER, string(k), 0)
// FIXME how is connectedness defined for the local node
pri := []pb.PeerRoutingInfo{
{
PeerInfo: peer.PeerInfo{
ID: c.local,
Addrs: c.peerhost.Addrs(),
},
},
}
msg.ProviderPeers = pb.PeerRoutingInfosToPBPeers(pri)
return c.proxy.SendMessage(ctx, msg) // TODO wrap to hide remote
}
// putValueToPeer stores the given key/value pair at the peer 'p'
func (dht *IpfsDHT) putValueToPeer(ctx context.Context, p peer.ID,
key key.Key, rec *pb.Record) error {
pmes := pb.NewMessage(pb.Message_PUT_VALUE, string(key), 0)
pmes.Record = rec
rpmes, err := dht.sendRequest(ctx, p, pmes)
if err != nil {
return err
}
if !bytes.Equal(rpmes.GetRecord().Value, pmes.GetRecord().Value) {
return errors.New("value not put correctly")
}
return nil
}
func (dht *IpfsDHT) handleGetProviders(ctx context.Context, p peer.ID, pmes *pb.Message) (*pb.Message, error) {
lm := make(lgbl.DeferredMap)
lm["peer"] = func() interface{} { return p.Pretty() }
defer log.EventBegin(ctx, "handleGetProviders", lm).Done()
resp := pb.NewMessage(pmes.GetType(), pmes.GetKey(), pmes.GetClusterLevel())
key := key.Key(pmes.GetKey())
lm["key"] = func() interface{} { return key.Pretty() }
// debug logging niceness.
reqDesc := fmt.Sprintf("%s handleGetProviders(%s, %s): ", dht.self, p, key)
log.Debugf("%s begin", reqDesc)
defer log.Debugf("%s end", reqDesc)
// check if we have this value, to add ourselves as provider.
has, err := dht.datastore.Has(key.DsKey())
if err != nil && err != ds.ErrNotFound {
log.Debugf("unexpected datastore error: %v\n", err)
has = false
}
// setup providers
providers := dht.providers.GetProviders(ctx, key)
if has {
providers = append(providers, dht.self)
log.Debugf("%s have the value. added self as provider", reqDesc)
}
if providers != nil && len(providers) > 0 {
infos := peer.PeerInfos(dht.peerstore, providers)
resp.ProviderPeers = pb.PeerInfosToPBPeers(dht.host.Network(), infos)
log.Debugf("%s have %d providers: %s", reqDesc, len(providers), infos)
}
// Also send closer peers.
closer := dht.betterPeersToQuery(pmes, p, CloserPeerCount)
if closer != nil {
infos := peer.PeerInfos(dht.peerstore, closer)
resp.CloserPeers = pb.PeerInfosToPBPeers(dht.host.Network(), infos)
log.Debugf("%s have %d closer peers: %s", reqDesc, len(closer), infos)
}
return resp, nil
}
func (c *Client) FindProvidersAsync(ctx context.Context, k key.Key, max int) <-chan peer.PeerInfo {
ctx = eventlog.ContextWithLoggable(ctx, eventlog.Uuid("findProviders"))
defer log.EventBegin(ctx, "findProviders", &k).Done()
ch := make(chan peer.PeerInfo)
go func() {
defer close(ch)
request := pb.NewMessage(pb.Message_GET_PROVIDERS, string(k), 0)
response, err := c.proxy.SendRequest(ctx, request)
if err != nil {
log.Debug(err)
return
}
for _, p := range pb.PBPeersToPeerInfos(response.GetProviderPeers()) {
select {
case <-ctx.Done():
log.Debug(ctx.Err())
return
case ch <- p:
}
}
}()
return ch
}
func (dht *IpfsDHT) findProvidersSingle(ctx context.Context, p peer.ID, key key.Key) (*pb.Message, error) {
defer log.EventBegin(ctx, "findProvidersSingle", p, &key).Done()
pmes := pb.NewMessage(pb.Message_GET_PROVIDERS, string(key), 0)
return dht.sendRequest(ctx, p, pmes)
}
// findPeerSingle asks peer 'p' if they know where the peer with id 'id' is
func (dht *IpfsDHT) findPeerSingle(ctx context.Context, p peer.ID, id peer.ID) (*pb.Message, error) {
defer log.EventBegin(ctx, "findPeerSingle", p, id).Done()
pmes := pb.NewMessage(pb.Message_FIND_NODE, string(id), 0)
return dht.sendRequest(ctx, p, pmes)
}
func (dht *IpfsDHT) handleGetValue(ctx context.Context, p peer.ID, pmes *pb.Message) (*pb.Message, error) {
defer log.EventBegin(ctx, "handleGetValue", p).Done()
log.Debugf("%s handleGetValue for key: %s", dht.self, pmes.GetKey())
// setup response
resp := pb.NewMessage(pmes.GetType(), pmes.GetKey(), pmes.GetClusterLevel())
// first, is there even a key?
k := pmes.GetKey()
if k == "" {
return nil, errors.New("handleGetValue but no key was provided")
// TODO: send back an error response? could be bad, but the other node's hanging.
}
// let's first check if we have the value locally.
log.Debugf("%s handleGetValue looking into ds", dht.self)
dskey := key.Key(k).DsKey()
iVal, err := dht.datastore.Get(dskey)
log.Debugf("%s handleGetValue looking into ds GOT %v", dht.self, iVal)
// if we got an unexpected error, bail.
if err != nil && err != ds.ErrNotFound {
return nil, err
}
// if we have the value, send it back
if err == nil {
log.Debugf("%s handleGetValue success!", dht.self)
byts, ok := iVal.([]byte)
if !ok {
return nil, fmt.Errorf("datastore had non byte-slice value for %v", dskey)
}
rec := new(pb.Record)
err := proto.Unmarshal(byts, rec)
if err != nil {
log.Debug("Failed to unmarshal dht record from datastore")
return nil, err
}
resp.Record = rec
}
// Find closest peer on given cluster to desired key and reply with that info
closer := dht.betterPeersToQuery(pmes, p, CloserPeerCount)
if len(closer) > 0 {
closerinfos := peer.PeerInfos(dht.peerstore, closer)
for _, pi := range closerinfos {
log.Debugf("handleGetValue returning closer peer: '%s'", pi.ID)
if len(pi.Addrs) < 1 {
log.Errorf(`no addresses on peer being sent!
[local:%s]
[sending:%s]
[remote:%s]`, dht.self, pi.ID, p)
}
}
resp.CloserPeers = pb.PeerInfosToPBPeers(dht.host.Network(), closerinfos)
}
return resp, nil
}
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
}