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client.go
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client.go
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package supernode
import (
"bytes"
"errors"
"time"
proto "github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/gogo/protobuf/proto"
context "github.com/ipfs/go-ipfs/Godeps/_workspace/src/golang.org/x/net/context"
key "github.com/ipfs/go-ipfs/blocks/key"
"github.com/ipfs/go-ipfs/p2p/host"
peer "github.com/ipfs/go-ipfs/p2p/peer"
routing "github.com/ipfs/go-ipfs/routing"
pb "github.com/ipfs/go-ipfs/routing/dht/pb"
proxy "github.com/ipfs/go-ipfs/routing/supernode/proxy"
logging "github.com/ipfs/go-ipfs/vendor/QmQg1J6vikuXF9oDvm4wpdeAUvvkVEKW1EYDw9HhTMnP2b/go-log"
)
var log = logging.Logger("supernode")
type Client struct {
peerhost host.Host
peerstore peer.Peerstore
proxy proxy.Proxy
local peer.ID
}
// TODO take in datastore/cache
func NewClient(px proxy.Proxy, h host.Host, ps peer.Peerstore, local peer.ID) (*Client, error) {
return &Client{
proxy: px,
local: local,
peerstore: ps,
peerhost: h,
}, nil
}
func (c *Client) FindProvidersAsync(ctx context.Context, k key.Key, max int) <-chan peer.PeerInfo {
ctx = logging.ContextWithLoggable(ctx, logging.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 (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) 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) GetValues(ctx context.Context, k key.Key, _ int) ([]routing.RecvdVal, 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 []routing.RecvdVal{
{
Val: response.Record.GetValue(),
From: c.local,
},
}, nil
}
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
}
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")
}
// creates and signs a record for the given key/value pair
func makeRecord(ps peer.Peerstore, p peer.ID, k key.Key, v []byte) (*pb.Record, error) {
blob := bytes.Join([][]byte{[]byte(k), v, []byte(p)}, []byte{})
sig, err := ps.PrivKey(p).Sign(blob)
if err != nil {
return nil, err
}
return &pb.Record{
Key: proto.String(string(k)),
Value: v,
Author: proto.String(string(p)),
Signature: sig,
}, nil
}
func (c *Client) Ping(ctx context.Context, id peer.ID) (time.Duration, error) {
defer log.EventBegin(ctx, "ping", id).Done()
return time.Nanosecond, errors.New("supernode routing does not support the ping method")
}
func (c *Client) Bootstrap(ctx context.Context) error {
return c.proxy.Bootstrap(ctx)
}
var _ routing.IpfsRouting = &Client{}