// Connect establishes a persistent connection to a peer, and adds it to the
// Gateway's peer list.
func (g *Gateway) Connect(addr modules.NetAddress) error {
if addr == g.Address() {
return errors.New("can't connect to our own address")
}
if build.Release != "testing" && addr.IsLoopback() {
return errors.New("can't connect to loopback address")
}
id := g.mu.RLock()
_, exists := g.peers[addr]
g.mu.RUnlock(id)
if exists {
return errors.New("peer already added")
}
conn, err := net.DialTimeout("tcp", string(addr), dialTimeout)
if err != nil {
return err
}
// send our version
if err := encoding.WriteObject(conn, build.Version); err != nil {
return err
}
// read version ack
var remoteVersion string
if err := encoding.ReadObject(conn, &remoteVersion, maxAddrLength); err != nil {
return err
} else if remoteVersion == "reject" {
return errors.New("peer rejected connection")
}
// decide whether to accept this version
if build.VersionCmp(remoteVersion, "0.3.3") < 0 {
conn.Close()
return errors.New("unacceptable version: " + remoteVersion)
}
g.log.Println("INFO: connected to new peer", addr)
id = g.mu.Lock()
g.addPeer(&peer{addr: addr, sess: muxado.Client(conn), inbound: false})
g.mu.Unlock(id)
// call initRPCs
id = g.mu.RLock()
for name, fn := range g.initRPCs {
go g.RPC(addr, name, fn)
}
g.mu.RUnlock(id)
return nil
}
