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server.go
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server.go
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// Copyright (c) Toby DiPasquale. See accompanying LICENSE file for
// detailed licensing information.
package main
import (
"fmt"
"io"
"net"
"os"
"sync"
"syscall"
"time"
)
const (
acceptTimeout = 3 * time.Second
)
// ----- Server Public API ---------------------------------------------------
type Server interface {
Addr() string
Start() error
Stop()
Fd() int
}
func NewServer(port int) Server {
return &server{
addr: fmt.Sprintf(":%v", port),
handlers: new(sync.WaitGroup),
stopAccepting: make(chan int),
}
}
func (s *server) Addr() string {
return s.addr
}
func (s *server) Start() error {
if err := s.listen(); err != nil {
return err
}
return s.serve()
}
func (s *server) Stop() {
s.stopAccepting <- 1
}
func (s *server) Fd() int {
return int(s.listenerFile.Fd())
}
// ----- Server Internal API -------------------------------------------------
type server struct {
addr string
listener net.TCPListener
listenerFile *os.File
handlers *sync.WaitGroup
stopAccepting chan int
}
func (s *server) listen() error {
var addr *net.TCPAddr
var err error
var listener *net.TCPListener
if addr, err = net.ResolveTCPAddr("tcp", s.addr); err != nil {
return err
}
if listener, err = net.ListenTCP("tcp", addr); err != nil {
return err
}
s.listener = *listener
if s.listenerFile, err = listener.File(); err != nil {
return err
}
if e := syscall.SetNonblock(s.Fd(), true); e != nil {
return e
}
return nil
}
func (s *server) serve() (e error) {
var accept = true
for accept {
var c net.Conn
s.listener.SetDeadline(time.Now().Add(acceptTimeout))
if c, e = s.listener.Accept(); e != nil {
s.logAcceptError(e)
continue
}
go s.handle(c)
select {
case <-s.stopAccepting:
accept = false
default:
}
}
fmt.Printf("shutting down; waiting for handlers\n")
s.handlers.Wait()
return nil
}
func (s *server) handle(c net.Conn) {
defer s.connTerminated(c)
var req *Request
var err error
for err == nil {
if req, err = ReadRequest(c); err != nil {
if err != io.ErrUnexpectedEOF {
fmt.Printf("error reading request from %v: %v", c.RemoteAddr(), err)
}
continue
}
// TODO: do something with request here
fmt.Printf("%v", req)
}
}
func (s *server) connTerminated(c net.Conn) {
c.Close()
s.handlers.Done()
}
func (s *server) logAcceptError(e error) {
if ope, ok := e.(*net.OpError); ok {
if !(ope.Timeout() && ope.Temporary()) {
fmt.Printf("error during accept: %v\n", ope)
}
} else {
fmt.Printf("error during accept: %v\n", e)
}
}