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virtual.go
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virtual.go
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package bitswap
import (
"context"
"errors"
"sync"
"time"
bsmsg "github.com/ipfs/go-ipfs/exchange/bitswap/message"
bsnet "github.com/ipfs/go-ipfs/exchange/bitswap/network"
delay "gx/ipfs/QmRJVNatYJwTAHgdSM1Xef9QVQ1Ch3XHdmcrykjP5Y4soL/go-ipfs-delay"
ifconnmgr "gx/ipfs/QmXuucFcuvAWYAJfhHV2h4BYreHEAsLSsiquosiXeuduTN/go-libp2p-interface-connmgr"
cid "gx/ipfs/QmYVNvtQkeZ6AKSwDrjQTs432QtL6umrrK41EBq3cu7iSP/go-cid"
routing "gx/ipfs/QmZ383TySJVeZWzGnWui6pRcKyYZk9VkKTuW7tmKRWk5au/go-libp2p-routing"
mockrouting "gx/ipfs/QmbFRJeEmEU16y3BmKKaD4a9fm5oHsEAMHe2vSB1UnfLMi/go-ipfs-routing/mock"
logging "gx/ipfs/QmcVVHfdyv15GVPk7NrxdWjh2hLVccXnoD8j2tyQShiXJb/go-log"
testutil "gx/ipfs/QmcW4FGAt24fdK1jBgWQn3yP4R9ZLyWQqjozv9QK7epRhL/go-testutil"
peer "gx/ipfs/QmdVrMn1LhB4ybb8hMVaMLXnA8XRSewMnK6YqXKXoTcRvN/go-libp2p-peer"
)
var log = logging.Logger("bstestnet")
func VirtualNetwork(rs mockrouting.Server, d delay.D) Network {
return &network{
clients: make(map[peer.ID]*receiverQueue),
delay: d,
routingserver: rs,
conns: make(map[string]struct{}),
}
}
type network struct {
mu sync.Mutex
clients map[peer.ID]*receiverQueue
routingserver mockrouting.Server
delay delay.D
conns map[string]struct{}
}
type message struct {
from peer.ID
msg bsmsg.BitSwapMessage
shouldSend time.Time
}
// receiverQueue queues up a set of messages to be sent, and sends them *in
// order* with their delays respected as much as sending them in order allows
// for
type receiverQueue struct {
receiver bsnet.Receiver
queue []*message
active bool
lk sync.Mutex
}
func (n *network) Adapter(p testutil.Identity) bsnet.BitSwapNetwork {
n.mu.Lock()
defer n.mu.Unlock()
client := &networkClient{
local: p.ID(),
network: n,
routing: n.routingserver.Client(p),
}
n.clients[p.ID()] = &receiverQueue{receiver: client}
return client
}
func (n *network) HasPeer(p peer.ID) bool {
n.mu.Lock()
defer n.mu.Unlock()
_, 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,
mes bsmsg.BitSwapMessage) error {
n.mu.Lock()
defer n.mu.Unlock()
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
msg := &message{
from: from,
msg: mes,
shouldSend: time.Now().Add(n.delay.Get()),
}
receiver.enqueue(msg)
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()
r.ReceiveMessage(context.TODO(), from, message)
return 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)
}
// FindProvidersAsync returns a channel of providers for the given key
func (nc *networkClient) FindProvidersAsync(ctx context.Context, k *cid.Cid, 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
}
func (nc *networkClient) ConnectionManager() ifconnmgr.ConnManager {
return &ifconnmgr.NullConnMgr{}
}
type messagePasser struct {
net *network
target peer.ID
local peer.ID
ctx context.Context
}
func (mp *messagePasser) SendMsg(ctx context.Context, m bsmsg.BitSwapMessage) error {
return mp.net.SendMessage(ctx, mp.local, mp.target, m)
}
func (mp *messagePasser) Close() error {
return nil
}
func (mp *messagePasser) Reset() error {
return nil
}
func (n *networkClient) NewMessageSender(ctx context.Context, p peer.ID) (bsnet.MessageSender, error) {
return &messagePasser{
net: n.network,
target: p,
local: n.local,
ctx: ctx,
}, nil
}
// Provide provides the key to the network
func (nc *networkClient) Provide(ctx context.Context, k *cid.Cid) error {
return nc.routing.Provide(ctx, k, true)
}
func (nc *networkClient) SetDelegate(r bsnet.Receiver) {
nc.Receiver = r
}
func (nc *networkClient) ConnectTo(_ context.Context, p peer.ID) error {
nc.network.mu.Lock()
otherClient, ok := nc.network.clients[p]
if !ok {
nc.network.mu.Unlock()
return errors.New("no such peer in network")
}
tag := tagForPeers(nc.local, p)
if _, ok := nc.network.conns[tag]; ok {
nc.network.mu.Unlock()
log.Warning("ALREADY CONNECTED TO PEER (is this a reconnect? test lib needs fixing)")
return nil
}
nc.network.conns[tag] = struct{}{}
nc.network.mu.Unlock()
// TODO: add handling for disconnects
otherClient.receiver.PeerConnected(nc.local)
nc.Receiver.PeerConnected(p)
return nil
}
func (rq *receiverQueue) enqueue(m *message) {
rq.lk.Lock()
defer rq.lk.Unlock()
rq.queue = append(rq.queue, m)
if !rq.active {
rq.active = true
go rq.process()
}
}
func (rq *receiverQueue) process() {
for {
rq.lk.Lock()
if len(rq.queue) == 0 {
rq.active = false
rq.lk.Unlock()
return
}
m := rq.queue[0]
rq.queue = rq.queue[1:]
rq.lk.Unlock()
time.Sleep(time.Until(m.shouldSend))
rq.receiver.ReceiveMessage(context.TODO(), m.from, m.msg)
}
}
func tagForPeers(a, b peer.ID) string {
if a < b {
return string(a + b)
}
return string(b + a)
}