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virtual.go
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virtual.go
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package bitswap
import (
"errors"
context "github.com/ipfs/go-ipfs/Godeps/_workspace/src/golang.org/x/net/context"
bsmsg "github.com/ipfs/go-ipfs/exchange/bitswap/message"
bsnet "github.com/ipfs/go-ipfs/exchange/bitswap/network"
peer "github.com/ipfs/go-ipfs/p2p/peer"
routing "github.com/ipfs/go-ipfs/routing"
mockrouting "github.com/ipfs/go-ipfs/routing/mock"
delay "github.com/ipfs/go-ipfs/thirdparty/delay"
util "github.com/ipfs/go-ipfs/util"
testutil "github.com/ipfs/go-ipfs/util/testutil"
)
func VirtualNetwork(rs mockrouting.Server, d delay.D) Network {
return &network{
clients: make(map[peer.ID]bsnet.Receiver),
delay: d,
routingserver: rs,
}
}
type network struct {
clients map[peer.ID]bsnet.Receiver
routingserver mockrouting.Server
delay delay.D
}
func (n *network) Adapter(p testutil.Identity) bsnet.BitSwapNetwork {
client := &networkClient{
local: p.ID(),
network: n,
routing: n.routingserver.Client(p),
}
n.clients[p.ID()] = client
return client
}
func (n *network) HasPeer(p peer.ID) bool {
_, found := n.clients[p]
return found
}
// TODO should this be completely asynchronous?
// TODO what does the network layer do with errors received from services?
func (n *network) SendMessage(
ctx context.Context,
from peer.ID,
to peer.ID,
message bsmsg.BitSwapMessage) error {
receiver, ok := n.clients[to]
if !ok {
return errors.New("Cannot locate peer on network")
}
// nb: terminate the context since the context wouldn't actually be passed
// over the network in a real scenario
go n.deliver(receiver, from, message)
return nil
}
func (n *network) deliver(
r bsnet.Receiver, from peer.ID, message bsmsg.BitSwapMessage) error {
if message == nil || from == "" {
return errors.New("Invalid input")
}
n.delay.Wait()
nextPeer, nextMsg := r.ReceiveMessage(context.TODO(), from, message)
if (nextPeer == "" && nextMsg != nil) || (nextMsg == nil && nextPeer != "") {
return errors.New("Malformed client request")
}
if nextPeer == "" && nextMsg == nil { // no response to send
return nil
}
nextReceiver, ok := n.clients[nextPeer]
if !ok {
return errors.New("Cannot locate peer on network")
}
go n.deliver(nextReceiver, nextPeer, nextMsg)
return nil
}
// TODO
func (n *network) SendRequest(
ctx context.Context,
from peer.ID,
to peer.ID,
message bsmsg.BitSwapMessage) (
incoming bsmsg.BitSwapMessage, err error) {
r, ok := n.clients[to]
if !ok {
return nil, errors.New("Cannot locate peer on network")
}
nextPeer, nextMsg := r.ReceiveMessage(context.TODO(), from, message)
// TODO dedupe code
if (nextPeer == "" && nextMsg != nil) || (nextMsg == nil && nextPeer != "") {
r.ReceiveError(errors.New("Malformed client request"))
return nil, nil
}
// TODO dedupe code
if nextPeer == "" && nextMsg == nil {
return nil, nil
}
// TODO test when receiver doesn't immediately respond to the initiator of the request
if nextPeer != from {
go func() {
nextReceiver, ok := n.clients[nextPeer]
if !ok {
// TODO log the error?
}
n.deliver(nextReceiver, nextPeer, nextMsg)
}()
return nil, nil
}
return nextMsg, nil
}
type networkClient struct {
local peer.ID
bsnet.Receiver
network *network
routing routing.IpfsRouting
}
func (nc *networkClient) SendMessage(
ctx context.Context,
to peer.ID,
message bsmsg.BitSwapMessage) error {
return nc.network.SendMessage(ctx, nc.local, to, message)
}
func (nc *networkClient) SendRequest(
ctx context.Context,
to peer.ID,
message bsmsg.BitSwapMessage) (incoming bsmsg.BitSwapMessage, err error) {
return nc.network.SendRequest(ctx, nc.local, to, message)
}
// FindProvidersAsync returns a channel of providers for the given key
func (nc *networkClient) FindProvidersAsync(ctx context.Context, k util.Key, max int) <-chan peer.ID {
// NB: this function duplicates the PeerInfo -> ID transformation in the
// bitswap network adapter. Not to worry. This network client will be
// deprecated once the ipfsnet.Mock is added. The code below is only
// temporary.
out := make(chan peer.ID)
go func() {
defer close(out)
providers := nc.routing.FindProvidersAsync(ctx, k, max)
for info := range providers {
select {
case <-ctx.Done():
case out <- info.ID:
}
}
}()
return out
}
// Provide provides the key to the network
func (nc *networkClient) Provide(ctx context.Context, k util.Key) error {
return nc.routing.Provide(ctx, k)
}
func (nc *networkClient) SetDelegate(r bsnet.Receiver) {
nc.Receiver = r
}