func (ids *IDService) IdentifyConn(c inet.Conn) {
ids.currmu.Lock()
if wait, found := ids.currid[c]; found {
ids.currmu.Unlock()
log.Debugf("IdentifyConn called twice on: %s", c)
<-wait // already identifying it. wait for it.
return
}
ch := make(chan struct{})
ids.currid[c] = ch
ids.currmu.Unlock()
defer close(ch)
s, err := c.NewStream()
if err != nil {
log.Debugf("error opening initial stream for %s: %s", ID, err)
log.Event(context.TODO(), "IdentifyOpenFailed", c.RemotePeer())
c.Close()
return
}
bwc := ids.Host.GetBandwidthReporter()
s = mstream.WrapStream(s, ID, bwc)
// ok give the response to our handler.
if err := msmux.SelectProtoOrFail(ID, s); err != nil {
log.Debugf("error writing stream header for %s", ID)
log.Event(context.TODO(), "IdentifyOpenFailed", c.RemotePeer())
s.Close()
return
}
ids.ResponseHandler(s)
ids.currmu.Lock()
_, found := ids.currid[c]
delete(ids.currid, c)
ids.currmu.Unlock()
if !found {
log.Debugf("IdentifyConn failed to find channel (programmer error) for %s", c)
return
}
}
// Dial connects to a peer over a particular address
// Ensures raddr is part of peer.Addresses()
// Example: d.DialAddr(ctx, peer.Addresses()[0], peer)
func (d *Dialer) Dial(ctx context.Context, raddr ma.Multiaddr, remote peer.ID) (Conn, error) {
logdial := lgbl.Dial("conn", d.LocalPeer, remote, nil, raddr)
logdial["encrypted"] = (d.PrivateKey != nil) // log wether this will be an encrypted dial or not.
defer log.EventBegin(ctx, "connDial", logdial).Done()
var connOut Conn
var errOut error
done := make(chan struct{})
// do it async to ensure we respect don contexteone
go func() {
defer func() {
select {
case done <- struct{}{}:
case <-ctx.Done():
}
}()
maconn, err := d.rawConnDial(ctx, raddr, remote)
if err != nil {
errOut = err
return
}
if d.Wrapper != nil {
maconn = d.Wrapper(maconn)
}
cryptoProtoChoice := SecioTag
if !EncryptConnections {
cryptoProtoChoice = NoEncryptionTag
}
maconn.SetReadDeadline(time.Now().Add(NegotiateReadTimeout))
err = msmux.SelectProtoOrFail(cryptoProtoChoice, maconn)
if err != nil {
errOut = err
return
}
maconn.SetReadDeadline(time.Time{})
c, err := newSingleConn(ctx, d.LocalPeer, remote, maconn)
if err != nil {
maconn.Close()
errOut = err
return
}
if d.PrivateKey == nil || EncryptConnections == false {
log.Warning("dialer %s dialing INSECURELY %s at %s!", d, remote, raddr)
connOut = c
return
}
c2, err := newSecureConn(ctx, d.PrivateKey, c)
if err != nil {
errOut = err
c.Close()
return
}
connOut = c2
}()
select {
case <-ctx.Done():
logdial["error"] = ctx.Err()
logdial["dial"] = "failure"
return nil, ctx.Err()
case <-done:
// whew, finished.
}
if errOut != nil {
logdial["error"] = errOut
logdial["dial"] = "failure"
return nil, errOut
}
logdial["dial"] = "success"
return connOut, nil
}