func Open(info *Info, opts DialOpts) (*State, error) {
// TODO Select a random address from info.Addrs
// and only fail when we've tried all the addresses.
// TODO what does "origin" really mean, and is localhost always ok?
cfg, err := websocket.NewConfig("wss://"+info.Addrs[0]+"/", "http://localhost/")
if err != nil {
return nil, err
}
pool := x509.NewCertPool()
xcert, err := cert.ParseCert(info.CACert)
if err != nil {
return nil, err
}
pool.AddCert(xcert)
cfg.TlsConfig = &tls.Config{
RootCAs: pool,
ServerName: "anything",
}
var conn *websocket.Conn
openAttempt := utils.AttemptStrategy{
Total: opts.Timeout,
Delay: opts.RetryDelay,
}
for a := openAttempt.Start(); a.Next(); {
log.Infof("state/api: dialing %q", cfg.Location)
conn, err = websocket.DialConfig(cfg)
if err == nil {
break
}
log.Errorf("state/api: %v", err)
}
if err != nil {
return nil, err
}
log.Infof("state/api: connection established")
client := rpc.NewConn(jsoncodec.NewWebsocket(conn))
client.Start()
st := &State{
client: client,
conn: conn,
}
if info.Tag != "" || info.Password != "" {
if err := st.Login(info.Tag, info.Password, info.Nonce); err != nil {
conn.Close()
return nil, err
}
}
st.broken = make(chan struct{})
go st.heartbeatMonitor()
return st, nil
}
// newRPCClientServer starts an RPC server serving a connection from a
// single client. When the server has finished serving the connection,
// it sends a value on the returned channel.
// If bidir is true, requests can flow in both directions.
func newRPCClientServer(c *C, root interface{}, tfErr func(error) error, bidir bool) (*rpc.Conn, <-chan error) {
l, err := net.Listen("tcp", "127.0.0.1:0")
c.Assert(err, IsNil)
srvDone := make(chan error, 1)
go func() {
conn, err := l.Accept()
if err != nil {
srvDone <- err
return
}
defer l.Close()
role := roleServer
if bidir {
role = roleBoth
}
rpcConn := rpc.NewConn(NewJSONCodec(conn, role))
err = rpcConn.Serve(root, tfErr)
if err != nil {
srvDone <- err
return
}
if root, ok := root.(*Root); ok {
root.conn = rpcConn
}
rpcConn.Start()
<-rpcConn.Dead()
srvDone <- rpcConn.Close()
}()
conn, err := net.Dial("tcp", l.Addr().String())
c.Assert(err, IsNil)
role := roleClient
if bidir {
role = roleBoth
}
client := rpc.NewConn(NewJSONCodec(conn, role))
client.Start()
return client, srvDone
}
func (srv *Server) serveConn(wsConn *websocket.Conn) error {
codec := jsoncodec.NewWebsocket(wsConn)
if loggo.GetLogger("").EffectiveLogLevel() >= loggo.DEBUG {
codec.SetLogging(true)
}
conn := rpc.NewConn(codec)
if err := conn.Serve(newStateServer(srv, conn), serverError); err != nil {
return err
}
conn.Start()
select {
case <-conn.Dead():
case <-srv.tomb.Dying():
}
return conn.Close()
}