func (ss *SubService) startProcess() (proc *os.Process, err error) {
cmd := exec.Command(ss.binPath, ss.argv...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
dRead, ssWrite, err := os.Pipe()
ssRead, dWrite, err := os.Pipe()
// Store Fd's for us to read/write to SubService
ss.pipe = daemon.NewPipe(dRead, dWrite)
// Pass SubService their side of the connection
cmd.ExtraFiles = append(cmd.ExtraFiles, ssRead, ssWrite)
err = cmd.Start()
proc = cmd.Process
startupTimer := time.NewTimer(RerunWait)
if proc != nil {
go ss.watchSignals()
go ss.watchProcess(proc, startupTimer)
}
return
}
func (s *Service) serveAdminRequests() {
rId := os.Stderr.Fd() + 2
wId := os.Stderr.Fd() + 3
pipeReader := os.NewFile(uintptr(rId), "")
pipeWriter := os.NewFile(uintptr(wId), "")
s.pipe = daemon.NewPipe(pipeReader, pipeWriter)
b := make([]byte, daemon.MAX_PIPE_BYTES)
for {
n, err := s.pipe.Read(b)
if err != nil {
if err != io.EOF {
log.Printf(log.ERROR, "Error reading from admin pipe "+err.Error())
} else {
// We received EOF, ensure we shutdown (if daemon died we could be orphaned)
s.Shutdown()
}
return
}
cmd := string(b[:n])
log.Println(log.TRACE, "Received "+cmd+" from daemon")
switch cmd {
case "SHUTDOWN":
s.Shutdown()
s.pipe.Write([]byte("ACK"))
break
case "REGISTER":
s.Register()
s.pipe.Write([]byte("ACK"))
case "UNREGISTER":
s.Unregister()
s.pipe.Write([]byte("ACK"))
case "LOG DEBUG", "LOG TRACE", "LOG INFO", "LOG WARN", "LOG ERROR", "LOG FATAL", "LOG PANIC":
parts := strings.Split(cmd, " ")
log.SetLogLevel(log.LevelFromString(parts[1]))
log.Println(log.INFO, "Setting log level to "+parts[1])
s.pipe.Write([]byte("ACK"))
}
}
}