func receivePidFromCommand(commandUsock *unixsocket.Usock, err error) (int, error) {
if err != nil {
return -1, err
}
msg, err := commandUsock.ReadMessage()
if err != nil {
return -1, err
}
intPid, _, _ := messages.ParsePidMessage(msg)
return intPid, err
}
func (mon *SlaveMonitor) slaveDidBeginRegistration(fd int) {
// Having just started the process, we expect an IO, which we convert to a UNIX domain socket
fileName := strconv.Itoa(rand.Int())
slaveFile := unixsocket.FdToFile(fd, fileName)
slaveUsock, err := unixsocket.NewUsockFromFile(slaveFile)
if err != nil {
slog.Error(err)
}
if err = slaveUsock.Conn.SetReadBuffer(1024); err != nil {
slog.Error(err)
}
if err = slaveUsock.Conn.SetWriteBuffer(1024); err != nil {
slog.Error(err)
}
// We now expect the slave to use this fd they send us to send a Pid&Identifier Message
msg, err := slaveUsock.ReadMessage()
if err != nil {
slog.Error(err)
}
pid, identifier, err := messages.ParsePidMessage(msg)
// And the last step before executing its action, the slave sends us a pipe it will later use to
// send us all the features it's loaded.
featurePipeFd, err := slaveUsock.ReadFD()
if err != nil {
slog.Error(err)
}
slaveNode := mon.tree.FindSlaveByName(identifier)
if slaveNode == nil {
Error("slavemonitor.go:slaveDidBeginRegistration:Unknown identifier:" + identifier)
}
slaveNode.SlaveWasInitialized(pid, slaveUsock, featurePipeFd)
}
