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daemon.go
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119 lines (102 loc) · 2.74 KB
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// // Example of a daemon with echo service
package main
import (
"net"
"os"
"os/signal"
"syscall"
"time"
"github.com/takama/daemon"
)
var (
// name of the service
name = "bindservice"
description = "My dreamer Service http://deepdreamvideo.com"
version = "v0.0.3"
// port which daemon should be listen
port = ":9977"
)
// dependencies that are NOT required by the service, but might be used
var dependencies = []string{"dummy.service"}
// Service has embedded daemon
type Service struct {
daemon.Daemon
}
// Manage by daemon commands or run the daemon
func (service *Service) Manage() (string, error) {
usage := "Usage: myservice install | remove | start | stop | status"
// if received any kind of command, do it
if len(os.Args) > 1 {
command := os.Args[1]
switch command {
case "install":
return service.Install()
case "remove":
return service.Remove()
case "start":
return service.Start()
case "stop":
return service.Stop()
case "status":
return service.Status()
default:
return usage, nil
}
}
// Do something, call your goroutines, etc
web()
// fmt.Println("got past web")
// Set up channel on which to send signal notifications.
// We must use a buffered channel or risk missing the signal
// if we're not ready to receive when the signal is sent.
interrupt := make(chan os.Signal, 1)
signal.Notify(interrupt, os.Interrupt, os.Kill, syscall.SIGTERM)
// Set up listener for defined host and port
listener, err := net.Listen("tcp", port)
if err != nil {
return "Possibly was a problem with the port binding", err
}
// set up channel on which to send accepted connections
listen := make(chan net.Conn, 100)
go acceptConnection(listener, listen)
// loop work cycle with accept connections or interrupt
// by system signal
for {
select {
case conn := <-listen:
go handleClient(conn)
case killSignal := <-interrupt:
Log.Info("Got signal:", killSignal)
Log.Info("Stoping listening on ", listener.Addr())
listener.Close()
if killSignal == os.Interrupt {
Log.Info("OK I'M QUITTING, WAIT 3 SECONDS TO OUTPUT A A VIDEO")
time.Sleep(time.Second * 4) //give dream a chance to clean up first
return "Daemon was interrupted by system signal", nil
}
return "Daemon was killed", nil
}
}
// never happen, but need to complete code
return usage, nil
}
// Accept a client connection and collect it in a channel
func acceptConnection(listener net.Listener, listen chan<- net.Conn) {
for {
conn, err := listener.Accept()
if err != nil {
continue
}
listen <- conn
}
}
func handleClient(client net.Conn) {
for {
buf := make([]byte, 4096)
numbytes, err := client.Read(buf)
if numbytes == 0 || err != nil {
return
}
client.Write(buf[:numbytes])
}
}