// Bootstrap kicks off IpfsNode bootstrapping. This function will periodically
// check the number of open connections and -- if there are too few -- initiate
// connections to well-known bootstrap peers. It also kicks off subsystem
// bootstrapping (i.e. routing).
func Bootstrap(n *IpfsNode, cfg BootstrapConfig) (io.Closer, error) {
// make a signal to wait for one bootstrap round to complete.
doneWithRound := make(chan struct{})
// the periodic bootstrap function -- the connection supervisor
periodic := func(worker goprocess.Process) {
ctx := procctx.WithProcessClosing(context.Background(), worker)
defer log.EventBegin(ctx, "periodicBootstrap", n.Identity).Done()
if err := bootstrapRound(ctx, n.PeerHost, cfg); err != nil {
log.Event(ctx, "bootstrapError", n.Identity, lgbl.Error(err))
log.Debugf("%s bootstrap error: %s", n.Identity, err)
}
<-doneWithRound
}
// kick off the node's periodic bootstrapping
proc := periodicproc.Tick(cfg.Period, periodic)
proc.Go(periodic) // run one right now.
// kick off Routing.Bootstrap
if n.Routing != nil {
ctx := procctx.WithProcessClosing(context.Background(), proc)
if err := n.Routing.Bootstrap(ctx); err != nil {
proc.Close()
return nil, err
}
}
doneWithRound <- struct{}{}
close(doneWithRound) // it no longer blocks periodic
return proc, nil
}
func newQueryRunner(q *dhtQuery) *dhtQueryRunner {
proc := process.WithParent(process.Background())
ctx := ctxproc.WithProcessClosing(context.Background(), proc)
return &dhtQueryRunner{
query: q,
peersToQuery: queue.NewChanQueue(ctx, queue.NewXORDistancePQ(q.key)),
peersRemaining: todoctr.NewSyncCounter(),
peersSeen: pset.New(),
rateLimit: make(chan struct{}, q.concurrency),
proc: proc,
}
}
func (r *dhtQueryRunner) queryPeer(proc process.Process, p peer.ID) {
// make sure we rate limit concurrency.
select {
case <-r.rateLimit:
case <-proc.Closing():
r.peersRemaining.Decrement(1)
return
}
// ok let's do this!
// create a context from our proc.
ctx := ctxproc.WithProcessClosing(context.Background(), proc)
// make sure we do this when we exit
defer func() {
// signal we're done proccessing peer p
r.peersRemaining.Decrement(1)
r.rateLimit <- struct{}{}
}()
// make sure we're connected to the peer.
// FIXME abstract away into the network layer
if conns := r.query.dht.host.Network().ConnsToPeer(p); len(conns) == 0 {
log.Infof("not connected. dialing.")
// while we dial, we do not take up a rate limit. this is to allow
// forward progress during potentially very high latency dials.
r.rateLimit <- struct{}{}
pi := peer.PeerInfo{ID: p}
if err := r.query.dht.host.Connect(ctx, pi); err != nil {
log.Debugf("Error connecting: %s", err)
notif.PublishQueryEvent(ctx, ¬if.QueryEvent{
Type: notif.QueryError,
Extra: err.Error(),
})
r.Lock()
r.errs = append(r.errs, err)
r.Unlock()
<-r.rateLimit // need to grab it again, as we deferred.
return
}
<-r.rateLimit // need to grab it again, as we deferred.
log.Debugf("connected. dial success.")
}
// finally, run the query against this peer
res, err := r.query.qfunc(ctx, p)
if err != nil {
log.Debugf("ERROR worker for: %v %v", p, err)
r.Lock()
r.errs = append(r.errs, err)
r.Unlock()
} else if res.success {
log.Debugf("SUCCESS worker for: %v %s", p, res)
r.Lock()
r.result = res
r.Unlock()
go r.proc.Close() // signal to everyone that we're done.
// must be async, as we're one of the children, and Close blocks.
} else if len(res.closerPeers) > 0 {
log.Debugf("PEERS CLOSER -- worker for: %v (%d closer peers)", p, len(res.closerPeers))
for _, next := range res.closerPeers {
if next.ID == r.query.dht.self { // dont add self.
log.Debugf("PEERS CLOSER -- worker for: %v found self", p)
continue
}
// add their addresses to the dialer's peerstore
r.query.dht.peerstore.AddAddrs(next.ID, next.Addrs, peer.TempAddrTTL)
r.addPeerToQuery(next.ID)
log.Debugf("PEERS CLOSER -- worker for: %v added %v (%v)", p, next.ID, next.Addrs)
}
} else {
log.Debugf("QUERY worker for: %v - not found, and no closer peers.", p)
}
}