// SendRaw sends to an ServerIdentity without wrapping the msg into a SDAMessage
func (h *Host) SendRaw(e *network.ServerIdentity, msg network.Body) error {
if msg == nil {
return errors.New("Can't send nil-packet")
}
h.networkLock.RLock()
c, ok := h.connections[e.ID]
h.networkLock.RUnlock()
if !ok {
var err error
c, err = h.Connect(e)
if err != nil {
return err
}
}
log.Lvlf4("%s sends to %s msg: %+v", h.ServerIdentity.Addresses, e, msg)
var err error
err = c.Send(context.TODO(), msg)
if err != nil /*&& err != network.ErrClosed*/ {
log.Lvl2("Couldn't send to", c.ServerIdentity().First(), ":", err, "trying again")
c, err = h.Connect(e)
if err != nil {
return err
}
err = c.Send(context.TODO(), msg)
if err != nil {
return err
}
}
log.Lvl5("Message sent")
return nil
}
// RegisterProtocolInstance takes a PI and stores it for dispatching the message
// to it.
func (o *Overlay) RegisterProtocolInstance(pi ProtocolInstance) error {
o.instancesLock.Lock()
defer o.instancesLock.Unlock()
var tni *TreeNodeInstance
var tok = pi.Token()
var ok bool
// if the TreeNodeInstance doesn't exist
if tni, ok = o.instances[tok.ID()]; !ok {
return ErrWrongTreeNodeInstance
}
if tni.isBound() {
return ErrProtocolRegistered
}
tni.bind(pi)
o.protocolInstances[tok.ID()] = pi
log.Lvlf4("%s registered ProtocolInstance %x", o.host.workingAddress, tok.ID())
return nil
}
// Handle a connection => giving messages to the MsgChans
func (h *Host) handleConn(c network.SecureConn) {
address := c.Remote()
for {
ctx := context.TODO()
am, err := c.Receive(ctx)
// This is for testing purposes only: if the connection is missing
// in the map, we just return silently
h.networkLock.Lock()
_, cont := h.connections[c.ServerIdentity().ID]
h.networkLock.Unlock()
if !cont {
log.Lvl3(h.workingAddress, "Quitting handleConn ", c.Remote(), " because entry is not there")
return
}
// So the receiver can know about the error
am.SetError(err)
am.From = address
log.Lvl5("Got message", am)
if err != nil {
h.closingMut.Lock()
log.Lvlf4("%+v got error (%+s) while receiving message (isClosing=%+v)",
h.ServerIdentity.First(), err, h.isClosing)
h.closingMut.Unlock()
if err == network.ErrClosed || err == network.ErrEOF || err == network.ErrTemp {
log.Lvl4(h.ServerIdentity.First(), c.Remote(), "quitting handleConn for-loop", err)
h.closeConnection(c)
return
}
log.Error(h.ServerIdentity.Addresses, "Error with connection", address, "=>", err)
} else {
h.closingMut.Lock()
if !h.isClosing {
h.networkChan <- am
}
h.closingMut.Unlock()
}
}
}
// TransmitMsg takes a message received from the host and treats it. It might
// - ask for the identityList
// - ask for the Tree
// - create a new protocolInstance
// - pass it to a given protocolInstance
func (o *Overlay) TransmitMsg(sdaMsg *ProtocolMsg) error {
o.transmitMux.Lock()
defer o.transmitMux.Unlock()
// do we have the entitylist ? if not, ask for it.
if o.Roster(sdaMsg.To.RosterID) == nil {
log.Lvl4("Will ask the Roster from token", sdaMsg.To.RosterID, len(o.entityLists), o.host.workingAddress)
return o.host.requestTree(sdaMsg.ServerIdentity, sdaMsg)
}
tree := o.Tree(sdaMsg.To.TreeID)
if tree == nil {
log.Lvl4("Will ask for tree from token")
return o.host.requestTree(sdaMsg.ServerIdentity, sdaMsg)
}
// TreeNodeInstance
var pi ProtocolInstance
o.instancesLock.Lock()
pi, ok := o.protocolInstances[sdaMsg.To.ID()]
done := o.instancesInfo[sdaMsg.To.ID()]
o.instancesLock.Unlock()
if done {
log.Lvl4("Message for TreeNodeInstance that is already finished")
return nil
}
// if the TreeNodeInstance is not there, creates it
if !ok {
log.Lvlf4("Creating TreeNodeInstance at %s %x", o.host.ServerIdentity, sdaMsg.To.ID())
tn, err := o.TreeNodeFromToken(sdaMsg.To)
if err != nil {
return errors.New("No TreeNode defined in this tree here")
}
tni := o.newTreeNodeInstanceFromToken(tn, sdaMsg.To)
// see if we know the Service Recipient
s, ok := o.host.serviceStore.serviceByID(sdaMsg.To.ServiceID)
// no servies defined => check if there is a protocol that can be
// created
if !ok {
pi, err = ProtocolInstantiate(sdaMsg.To.ProtoID, tni)
if err != nil {
return err
}
go pi.Dispatch()
/// use the Services to instantiate it
} else {
// request the PI from the Service and binds the two
pi, err = s.NewProtocol(tni, &sdaMsg.Config)
if err != nil {
return err
}
if pi == nil {
return nil
}
go pi.Dispatch()
}
if err := o.RegisterProtocolInstance(pi); err != nil {
return errors.New("Error Binding TreeNodeInstance and ProtocolInstance: " +
err.Error())
}
log.Lvl4(o.host.workingAddress, "Overlay created new ProtocolInstace msg => ",
fmt.Sprintf("%+v", sdaMsg.To))
}
log.Lvl4("Dispatching message", o.host.ServerIdentity)
// TODO Check if TreeNodeInstance is already Done
pi.ProcessProtocolMsg(sdaMsg)
return nil
}
// Send opens the connection to 'dst' and sends the message 'req'. The
// reply is returned, or an error if the timeout of 10 seconds is reached.
func (c *Client) Send(dst *network.ServerIdentity, msg network.Body) (*network.Packet, error) {
c.Lock()
defer c.Unlock()
if c.host == nil {
kp := config.NewKeyPair(network.Suite)
c.host = network.NewSecureTCPHost(kp.Secret,
network.NewServerIdentity(kp.Public, ""))
}
// Connect to the root
log.Lvl4("Opening connection to", dst)
con, err := c.host.Open(dst)
defer c.host.Close()
if err != nil {
return nil, err
}
m, err := network.NewNetworkMessage(msg)
if err != nil {
return nil, err
}
b, err := m.MarshalBinary()
if err != nil {
return nil, err
}
serviceReq := &ClientRequest{
Service: c.ServiceID,
Data: b,
}
pchan := make(chan network.Packet)
go func() {
// send the request
log.Lvlf4("Sending request %x", serviceReq.Service)
if err := con.Send(context.TODO(), serviceReq); err != nil {
close(pchan)
return
}
log.Lvl4("Waiting for the response from", reflect.ValueOf(con).Pointer())
// wait for the response
packet, err := con.Receive(context.TODO())
if err != nil {
packet.Msg = StatusRet{err.Error()}
packet.MsgType = network.TypeFromData(&StatusRet{})
}
pchan <- packet
}()
select {
case response := <-pchan:
log.Lvlf5("Response: %+v %+v", response, response.Msg)
// Catch an eventual error
err := ErrMsg(&response, nil)
if err != nil {
return nil, err
}
return &response, nil
case <-time.After(time.Second * 10):
return &network.Packet{}, errors.New("Timeout on sending message")
}
}