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// Copyright 2019 Andy Pan. All rights reserved.
// Copyright 2018 Joshua J Baker. All rights reserved.
// Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.
// +build darwin netbsd freebsd openbsd dragonfly linux
package gnet
import (
"net"
"time"
"github.com/panjf2000/gnet/internal"
"github.com/panjf2000/gnet/ringbuffer"
"golang.org/x/sys/unix"
)
type loop struct {
idx int // loop index in the server loops list
poller *internal.Poller // epoll or kqueue
packet []byte // read packet buffer
fdconns map[int]*conn // loop connections fd -> conn
}
func (l *loop) loopCloseConn(svr *server, conn *conn, err error) error {
delete(l.fdconns, conn.fd)
_ = unix.Close(conn.fd)
if svr.events.OnClosed != nil {
switch svr.events.OnClosed(conn, err) {
case None:
case Shutdown:
return errClosing
}
}
return nil
}
func (l *loop) loopDetachConn(svr *server, conn *conn, err error) error {
if svr.events.OnDetached == nil {
return l.loopCloseConn(svr, conn, err)
}
l.poller.ModDetach(conn.fd)
delete(l.fdconns, conn.fd)
if err := unix.SetNonblock(conn.fd, false); err != nil {
return err
}
switch svr.events.OnDetached(conn, &detachedConn{fd: conn.fd}) {
case None:
case Shutdown:
return errClosing
}
return nil
}
func (l *loop) loopNote(svr *server, note interface{}) error {
var err error
switch v := note.(type) {
case time.Duration:
delay, action := svr.events.Tick()
switch action {
case None:
case Shutdown:
err = errClosing
}
svr.tch <- delay
case error: // shutdown
err = v
case *conn:
// Wake called for connection
if l.fdconns[v.fd] != v {
return nil // ignore stale wakes
}
return l.loopWake(svr, v)
case *mail:
l.fdconns[v.fd] = v.conn
l.poller.AddReadWrite(v.fd)
}
return err
}
func (l *loop) loopRun(svr *server) {
defer func() {
svr.signalShutdown()
svr.wg.Done()
}()
if l.idx == 0 && svr.events.Tick != nil {
go l.loopTicker(svr)
}
_ = l.poller.Polling(func(fd int, note interface{}) error {
if fd == 0 {
return l.loopNote(svr, note)
}
conn := l.fdconns[fd]
switch {
case conn == nil:
return l.loopAccept(svr, fd)
case !conn.opened:
return l.loopOpened(svr, conn)
case conn.outBuf.Length() > 0:
return l.loopWrite(svr, conn)
case conn.action != None:
return l.loopAction(svr, conn)
default:
return l.loopRead(svr, conn)
}
})
}
func (l *loop) loopTicker(svr *server) {
for {
if err := l.poller.Trigger(time.Duration(0)); err != nil {
break
}
time.Sleep(<-svr.tch)
}
}
func (l *loop) loopAccept(svr *server, fd int) error {
for i, ln := range svr.lns {
if ln.fd == fd {
if ln.pconn != nil {
return l.loopUDPRead(svr, i, fd)
}
nfd, sa, err := unix.Accept(fd)
if err != nil {
if err == unix.EAGAIN {
return nil
}
return err
}
if err := unix.SetNonblock(nfd, true); err != nil {
return err
}
conn := &conn{fd: nfd,
sa: sa,
lnidx: i,
inBuf: ringbuffer.New(cacheRingBufferSize),
outBuf: ringbuffer.New(cacheRingBufferSize),
loop: l,
}
l.fdconns[conn.fd] = conn
l.poller.AddReadWrite(conn.fd)
return nil
}
}
return nil
}
func (l *loop) loopUDPRead(svr *server, lnidx, fd int) error {
n, sa, err := unix.Recvfrom(fd, l.packet, 0)
if err != nil || n == 0 {
return nil
}
if svr.events.React != nil {
var sa6 unix.SockaddrInet6
switch sa := sa.(type) {
case *unix.SockaddrInet4:
sa6.ZoneId = 0
sa6.Port = sa.Port
for i := 0; i < 12; i++ {
sa6.Addr[i] = 0
}
sa6.Addr[12] = sa.Addr[0]
sa6.Addr[13] = sa.Addr[1]
sa6.Addr[14] = sa.Addr[2]
sa6.Addr[15] = sa.Addr[3]
case *unix.SockaddrInet6:
sa6 = *sa
}
conn := &conn{
addrIndex: lnidx,
localAddr: svr.lns[lnidx].lnaddr,
remoteAddr: internal.SockaddrToUDPAddr(&sa6),
inBuf: ringbuffer.New(cacheRingBufferSize),
}
_, _ = conn.inBuf.Write(l.packet[:n])
out, action := svr.events.React(conn, conn.inBuf)
if len(out) > 0 {
if svr.events.PreWrite != nil {
svr.events.PreWrite()
}
sniffError(unix.Sendto(fd, out, 0, sa))
}
switch action {
case Shutdown:
return errClosing
}
}
return nil
}
func (l *loop) loopOpened(svr *server, conn *conn) error {
conn.opened = true
conn.addrIndex = conn.lnidx
conn.localAddr = svr.lns[conn.lnidx].lnaddr
conn.remoteAddr = internal.SockaddrToTCPOrUnixAddr(conn.sa)
if svr.events.OnOpened != nil {
out, opts, action := svr.events.OnOpened(conn)
conn.action = action
if opts.TCPKeepAlive > 0 {
if _, ok := svr.lns[conn.lnidx].ln.(*net.TCPListener); ok {
sniffError(internal.SetKeepAlive(conn.fd, int(opts.TCPKeepAlive/time.Second)))
}
}
if len(out) > 0 {
conn.sendOut(out)
}
}
if conn.outBuf.Length() == 0 && conn.action == None {
l.poller.ModRead(conn.fd)
}
return nil
}
func (l *loop) loopWrite(svr *server, conn *conn) error {
if svr.events.PreWrite != nil {
svr.events.PreWrite()
}
top, tail := conn.outBuf.PreReadAll()
n, err := unix.Write(conn.fd, top)
if err != nil {
if err == unix.EAGAIN {
return nil
}
return l.loopCloseConn(svr, conn, err)
}
conn.outBuf.Advance(n)
if len(top) == n && len(tail) > 0 {
n, err := unix.Write(conn.fd, tail)
if err != nil {
if err == unix.EAGAIN {
return nil
}
return l.loopCloseConn(svr, conn, err)
}
conn.outBuf.Advance(n)
}
if conn.outBuf.Length() == 0 && conn.action == None {
l.poller.ModRead(conn.fd)
}
return nil
}
func (l *loop) loopAction(svr *server, conn *conn) error {
switch conn.action {
default:
conn.action = None
case Close:
return l.loopCloseConn(svr, conn, nil)
case Shutdown:
return errClosing
case Detach:
return l.loopDetachConn(svr, conn, nil)
}
if conn.outBuf.Length() == 0 && conn.action == None {
l.poller.ModRead(conn.fd)
}
return nil
}
func (l *loop) loopWake(svr *server, conn *conn) error {
if svr.events.React == nil {
return nil
}
out, action := svr.events.React(conn, conn.inBuf)
conn.action = action
if len(out) > 0 {
conn.sendOut(out)
}
if conn.outBuf.Length() != 0 || conn.action != None {
l.poller.ModReadWrite(conn.fd)
}
return nil
}
func (l *loop) loopRead(svr *server, conn *conn) error {
n, err := unix.Read(conn.fd, l.packet)
if n == 0 || err != nil {
if err == unix.EAGAIN {
return nil
}
return l.loopCloseConn(svr, conn, err)
}
_, _ = conn.inBuf.Write(l.packet[:n])
if svr.events.React != nil {
out, action := svr.events.React(conn, conn.inBuf)
conn.action = action
if len(out) > 0 {
conn.sendOut(out)
}
}
if conn.outBuf.Length() != 0 || conn.action != None {
l.poller.ModReadWrite(conn.fd)
}
return nil
}