/
server.go
275 lines (245 loc) · 6.03 KB
/
server.go
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// server
package pillx
import (
"bufio"
"io"
"log"
"net"
"os"
"os/signal"
"sync"
"syscall"
"time"
)
// 用来获得当前的router并回调相应的处理方法
type ServerHandler struct {
server *Server
}
func (sh ServerHandler) serve(res *Response, req IProtocol) {
router := sh.server.Handler
router.Serve(res, req)
}
var (
bufioReaderPool sync.Pool
bufioWriter2kPool sync.Pool
bufioWriter4kPool sync.Pool
DefaultHammerTime time.Duration = 60 * time.Second
)
func bufioWriterPool(size int) *sync.Pool {
switch size {
case 2 << 10:
return &bufioWriter2kPool
case 4 << 10:
return &bufioWriter4kPool
}
return nil
}
func newBufioReader(r io.Reader) *bufio.Reader {
if v := bufioReaderPool.Get(); v != nil {
br := v.(*bufio.Reader)
br.Reset(r)
return br
}
return bufio.NewReader(r)
}
func newBufioWriterSize(w io.Writer, size int) *bufio.Writer {
pool := bufioWriterPool(size)
if pool != nil {
if v := pool.Get(); v != nil {
bw := v.(*bufio.Writer)
bw.Reset(w)
return bw
}
}
return bufio.NewWriterSize(w, size)
}
// 继承自mutex锁,可以安全的读取数据
type liveSwitchReader struct {
sync.Mutex
r io.Reader
}
func (sr *liveSwitchReader) Read(p []byte) (n int, err error) {
sr.Lock()
r := sr.r
sr.Unlock()
return r.Read(p)
}
// tcpKeepAliveListener sets TCP keep-alive timeouts on accepted
// connections. It's used by ListenAndServe and ListenAndServeTLS so
// dead TCP connections (e.g. closing laptop mid-download) eventually
// go away.
type tcpKeepAliveListener struct {
*net.TCPListener
}
func (ln tcpKeepAliveListener) Accept() (c net.Conn, err error) {
tc, err := ln.AcceptTCP()
if err != nil {
return
}
tc.SetKeepAlive(true)
tc.SetKeepAlivePeriod(3 * time.Minute)
return tc, nil
}
// noLimit is an effective infinite upper bound for io.LimitedReader
const noLimit int64 = (1 << 63) - 1
type Server struct {
Addr string // TCP address to listen on, ":http" if empty
Handler Handler // handler to invoke, http.DefaultServeMux if nil
Protocol IProtocol
// ErrorLog specifies an optional logger for errors accepting
// connections and unexpected behavior from handlers.
// If nil, logging goes to os.Stderr via the log package's
// standard logger.
ErrorLog *log.Logger
}
//注册路由相应处理方法
func (srv *Server) HandleFunc(name uint16, handler func(*Response, IProtocol)) {
if srv.Handler == nil {
srv.Handler = NewServeRouter()
}
srv.Handler.(*ServeRouter).handleFunc(name, handler)
}
func (srv *Server) newConn(rc net.Conn) (c *Conn, err error) {
c = new(Conn)
c.remote_addr = rc.RemoteAddr().String()
c.server = srv
c.remonte_conn = rc
c.io_writer = rc
c.sr = liveSwitchReader{r: c.remonte_conn}
c.lr = io.LimitReader(&c.sr, noLimit).(*io.LimitedReader)
br := newBufioReader(c.lr) //bufio pool
bw := newBufioWriterSize(checkConnErrorWriter{c}, 4<<10)
c.buf = bufio.NewReadWriter(br, bw)
return c, nil
}
// ListenAndServe listens on the TCP network address srv.Addr and then
// calls Serve to handle requests on incoming connections. If
// srv.Addr is blank, ":5917" is used.
func (srv *Server) ListenAndServe() error {
addr := srv.Addr
if addr == "" {
addr = ":5917"
}
ln, err := net.Listen("tcp", addr)
if err != nil {
return err
}
return srv.Serve(tcpKeepAliveListener{ln.(*net.TCPListener)})
}
func (srv *Server) ListenAndServeUdp() error {
addr := srv.Addr
if addr == "" {
addr = ":5917"
}
udpAddr, err := net.ResolveUDPAddr("udp", addr)
if err != nil {
return err
}
conn, err := net.ListenUDP("udp", udpAddr)
if err != nil {
return err
}
for {
c, err := srv.newConn(conn)
if err != nil {
continue
}
go c.serve()
}
}
// Serve accepts incoming connections on the Listener l, creating a
// new service goroutine for each. The service goroutines read requests and
// then call srv.Handler to reply to them.
func (srv *Server) Serve(l net.Listener) error {
defer l.Close()
var tempDelay time.Duration // how long to sleep on accept failure
for {
//remote connnetion
rc, e := l.Accept()
if e != nil {
if ne, ok := e.(net.Error); ok && ne.Temporary() {
if tempDelay == 0 {
tempDelay = 5 * time.Millisecond
} else {
tempDelay *= 2
}
if max := 1 * time.Second; tempDelay > max {
tempDelay = max
}
srv.logf("http: Accept error: %v; retrying in %v", e, tempDelay)
time.Sleep(tempDelay)
continue
}
return e
}
tempDelay = 0
c, err := srv.newConn(rc)
if err != nil {
continue
}
//c.setState(c.rc, StateNew) // before Serve can return
go c.serve()
}
}
/*
handleSignals listens for os Signals and calls any hooked in function that the
user had registered with the signal.
*/
func (srv *Server) handleSignals() {
var sig os.Signal
hookableSignals := []os.Signal{
syscall.SIGHUP,
//syscall.SIGUSR1,
//syscall.SIGUSR2,
syscall.SIGINT,
syscall.SIGTERM,
//syscall.SIGTSTP,
syscall.SIGQUIT,
}
sigChan := make(chan os.Signal)
signal.Notify(
sigChan,
hookableSignals...,
)
pid := syscall.Getpid()
for {
sig = <-sigChan
switch sig {
case syscall.SIGHUP:
log.Println(pid, "Received SIGHUP. forking.")
case syscall.SIGINT:
log.Println(pid, "Received SIGINT.")
srv.shutdown()
case syscall.SIGTERM:
log.Println(pid, "Received SIGTERM.")
srv.shutdown()
default:
log.Printf("Received %v: nothing i care about...\n", sig)
}
break
}
}
func (srv *Server) shutdown() {
time.Sleep(DefaultHammerTime)
return
}
func (s *Server) logf(format string, args ...interface{}) {
if s.ErrorLog != nil {
s.ErrorLog.Printf(format, args...)
} else {
log.Printf(format, args...)
}
}
// checkConnErrorWriter writes to c.rwc and records any write errors to c.werr.
// It only contains one field (and a pointer field at that), so it
// fits in an interface value without an extra allocation.
type checkConnErrorWriter struct {
c *Conn
}
func (w checkConnErrorWriter) Write(p []byte) (n int, err error) {
n, err = w.c.io_writer.Write(p) // c.w == c.rwc, except after a hijack, when rwc is nil.
if err != nil && w.c.io_writer_err == nil {
w.c.io_writer_err = err
}
return
}