func (r *req) SendHook(m *mangos.Message) bool {
if r.raw {
// Raw mode has no automatic retry, and must include the
// request id in the header coming down.
return true
}
r.Lock()
defer r.Unlock()
// We need to generate a new request id, and append it to the header.
r.reqid = r.nextID()
v := r.reqid
m.Header = append(m.Header,
byte(v>>24), byte(v>>16), byte(v>>8), byte(v))
r.reqmsg = m.Dup()
// Schedule a retry, in case we don't get a reply.
if r.retry > 0 {
r.waker.Reset(r.retry)
} else {
r.waker.Stop()
}
r.sock.SetRecvError(nil)
return true
}
func (x *star) SendHook(m *mangos.Message) bool {
if x.raw {
// TTL header must be present.
return true
}
// new message has a zero hop count
m.Header = append(m.Header, 0, 0, 0, 0)
return true
}
// We save the backtrace from this message. This means that if the app calls
// Recv before calling Send, the saved backtrace will be lost. This is how
// the application discards / cancels a request to which it declines to reply.
// This is only done in cooked mode.
func (r *rep) RecvHook(m *mangos.Message) bool {
if r.raw {
return true
}
r.sock.SetSendError(nil)
r.backtraceL.Lock()
r.backtrace = append(r.backtracebuf[0:0], m.Header...)
r.backtraceL.Unlock()
m.Header = nil
return true
}
func (x *resp) SendHook(m *mangos.Message) bool {
if x.raw {
// Raw mode senders expected to have prepared header already.
return true
}
x.sock.SetSendError(mangos.ErrProtoState)
x.Lock()
m.Header = append(m.Header[0:0], x.backtrace...)
x.backtrace = nil
x.Unlock()
if len(m.Header) == 0 {
return false
}
return true
}
func (r *rep) SendHook(m *mangos.Message) bool {
// Store our saved backtrace. Note that if none was previously stored,
// there is no one to reply to, and we drop the message. We only
// do this in cooked mode.
if r.raw {
return true
}
r.sock.SetSendError(mangos.ErrProtoState)
r.backtraceL.Lock()
m.Header = append(m.Header[0:0], r.backtrace...)
r.backtrace = nil
r.backtraceL.Unlock()
if m.Header == nil {
return false
}
return true
}
func (x *surveyor) RecvHook(m *mangos.Message) bool {
if x.raw {
return true
}
x.Lock()
defer x.Unlock()
if len(m.Header) < 4 {
return false
}
if binary.BigEndian.Uint32(m.Header) != x.surveyID {
return false
}
m.Header = m.Header[4:]
return true
}
func (r *rep) sender() {
defer r.w.Done()
sq := r.sock.SendChannel()
cq := r.sock.CloseChannel()
for {
var m *mangos.Message
select {
case m = <-sq:
case <-cq:
return
}
// Lop off the 32-bit peer/pipe ID. If absent, drop.
if len(m.Header) < 4 {
m.Free()
continue
}
id := binary.BigEndian.Uint32(m.Header)
m.Header = m.Header[4:]
r.Lock()
pe := r.eps[id]
r.Unlock()
if pe == nil {
m.Free()
continue
}
select {
case pe.q <- m:
default:
// If our queue is full, we have no choice but to
// throw it on the floor. This shoudn't happen,
// since each partner should be running synchronously.
// Devices are a different situation, and this could
// lead to lossy behavior there. Initiators will
// resend if this happens. Devices need to have deep
// enough queues and be fast enough to avoid this.
m.Free()
}
}
}
func (x *resp) sender() {
// This is pretty easy because we have only one peer at a time.
// If the peer goes away, we'll just drop the message on the floor.
defer x.w.Done()
cq := x.sock.CloseChannel()
sq := x.sock.SendChannel()
for {
var m *mangos.Message
select {
case m = <-sq:
case <-cq:
return
}
// Lop off the 32-bit peer/pipe ID. If absent, drop.
if len(m.Header) < 4 {
m.Free()
continue
}
id := binary.BigEndian.Uint32(m.Header)
m.Header = m.Header[4:]
x.Lock()
peer := x.peers[id]
x.Unlock()
if peer == nil {
m.Free()
continue
}
// Put it on the outbound queue
select {
case peer.q <- m:
default:
// Backpressure, drop it.
m.Free()
}
}
}
func (x *surveyor) SendHook(m *mangos.Message) bool {
if x.raw {
return true
}
x.Lock()
x.surveyID = x.nextID | 0x80000000
x.nextID++
x.sock.SetRecvError(nil)
v := x.surveyID
m.Header = append(m.Header,
byte(v>>24), byte(v>>16), byte(v>>8), byte(v))
if x.duration > 0 {
x.timer.Reset(x.duration)
}
x.Unlock()
return true
}
func (x *bus) RecvHook(m *mangos.Message) bool {
if !x.raw && len(m.Header) >= 4 {
m.Header = m.Header[4:]
}
return true
}
