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// Copyright (c) 2019 Andy Pan
// Copyright (c) 2018 Joshua J Baker
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build linux || freebsd || dragonfly || darwin
// +build linux freebsd dragonfly darwin
package gnet
import (
"context"
"errors"
"fmt"
"os"
"sync/atomic"
"time"
"unsafe"
"golang.org/x/sys/unix"
gerrors "github.com/panjf2000/gnet/errors"
"github.com/panjf2000/gnet/internal/io"
"github.com/panjf2000/gnet/internal/netpoll"
"github.com/panjf2000/gnet/logging"
)
type eventloop struct {
internalEventloop
// Prevents eventloop from false sharing by padding extra memory with the difference
// between the cache line size "s" and (eventloop mod s) for the most common CPU architectures.
_ [64 - unsafe.Sizeof(internalEventloop{})%64]byte
}
//nolint:structcheck
type internalEventloop struct {
ln *listener // listener
idx int // loop index in the server loops list
svr *server // server in loop
poller *netpoll.Poller // epoll or kqueue
buffer []byte // read packet buffer whose capacity is set by user, default value is 64KB
connCount int32 // number of active connections in event-loop
connections map[int]*conn // loop connections fd -> conn
eventHandler EventHandler // user eventHandler
}
func (el *eventloop) getLogger() logging.Logger {
return el.svr.opts.Logger
}
func (el *eventloop) addConn(delta int32) {
atomic.AddInt32(&el.connCount, delta)
}
func (el *eventloop) loadConn() int32 {
return atomic.LoadInt32(&el.connCount)
}
func (el *eventloop) closeAllConns() {
// Close loops and all outstanding connections
for _, c := range el.connections {
_ = el.loopCloseConn(c, nil)
}
}
func (el *eventloop) loopRegister(itf interface{}) error {
c := itf.(*conn)
if err := el.poller.AddRead(c.pollAttachment); err != nil {
_ = unix.Close(c.fd)
c.releaseTCP()
return nil
}
el.connections[c.fd] = c
return el.loopOpen(c)
}
func (el *eventloop) loopOpen(c *conn) error {
c.opened = true
el.addConn(1)
out, action := el.eventHandler.OnOpened(c)
if out != nil {
if err := c.open(out); err != nil {
return err
}
}
if !c.outboundBuffer.IsEmpty() {
if err := el.poller.AddWrite(c.pollAttachment); err != nil {
return err
}
}
return el.handleAction(c, action)
}
func (el *eventloop) loopRead(c *conn) error {
n, err := unix.Read(c.fd, el.buffer)
if n == 0 || err != nil {
if err == unix.EAGAIN {
return nil
}
return el.loopCloseConn(c, os.NewSyscallError("read", err))
}
c.buffer = el.buffer[:n]
for packet, _ := c.read(); packet != nil; packet, _ = c.read() {
out, action := el.eventHandler.React(packet, c)
if out != nil {
// Encode data and try to write it back to the client, this attempt is based on a fact:
// a client socket waits for the response data after sending request data to the server,
// which makes the client socket writable.
if err = c.write(out); err != nil {
return err
}
}
switch action {
case None:
case Close:
return el.loopCloseConn(c, nil)
case Shutdown:
return gerrors.ErrServerShutdown
}
// Check the status of connection every loop since it might be closed during writing data back to client due to
// some kind of system error.
if !c.opened {
return nil
}
}
_, _ = c.inboundBuffer.Write(c.buffer)
return nil
}
func (el *eventloop) loopWrite(c *conn) error {
el.eventHandler.PreWrite(c)
head, tail := c.outboundBuffer.PeekAll()
var (
n int
err error
)
if len(tail) > 0 {
n, err = io.Writev(c.fd, [][]byte{head, tail})
} else {
n, err = unix.Write(c.fd, head)
}
c.outboundBuffer.Discard(n)
switch err {
case nil, gerrors.ErrShortWritev: // do nothing, just go on
case unix.EAGAIN:
return nil
default:
return el.loopCloseConn(c, os.NewSyscallError("write", err))
}
// All data have been drained, it's no need to monitor the writable events,
// remove the writable event from poller to help the future event-loops.
if c.outboundBuffer.IsEmpty() {
_ = el.poller.ModRead(c.pollAttachment)
}
el.eventHandler.AfterWrite(c, nil)
return nil
}
func (el *eventloop) loopCloseConn(c *conn, err error) (rerr error) {
if !c.opened {
return
}
// Send residual data in buffer back to client before actually closing the connection.
if !c.outboundBuffer.IsEmpty() {
el.eventHandler.PreWrite(c)
head, tail := c.outboundBuffer.PeekAll()
if n, err := unix.Write(c.fd, head); err == nil {
if n == len(head) && tail != nil {
_, _ = unix.Write(c.fd, tail)
}
}
el.eventHandler.AfterWrite(c, nil)
}
if err0, err1 := el.poller.Delete(c.fd), unix.Close(c.fd); err0 == nil && err1 == nil {
delete(el.connections, c.fd)
el.addConn(-1)
if el.eventHandler.OnClosed(c, err) == Shutdown {
return gerrors.ErrServerShutdown
}
c.releaseTCP()
} else {
if err0 != nil {
rerr = fmt.Errorf("failed to delete fd=%d from poller in event-loop(%d): %v", c.fd, el.idx, err0)
}
if err1 != nil {
err1 = fmt.Errorf("failed to close fd=%d in event-loop(%d): %v", c.fd, el.idx, os.NewSyscallError("close", err1))
if rerr != nil {
rerr = errors.New(rerr.Error() + " & " + err1.Error())
} else {
rerr = err1
}
}
}
return
}
func (el *eventloop) loopWake(c *conn) error {
if co, ok := el.connections[c.fd]; !ok || co != c {
return nil // ignore stale wakes.
}
out, action := el.eventHandler.React(nil, c)
if out != nil {
if err := c.write(out); err != nil {
return err
}
}
return el.handleAction(c, action)
}
func (el *eventloop) loopTicker(ctx context.Context) {
if el == nil {
return
}
var (
action Action
delay time.Duration
timer *time.Timer
)
defer func() {
if timer != nil {
timer.Stop()
}
}()
for {
delay, action = el.eventHandler.Tick()
switch action {
case None:
case Shutdown:
err := el.poller.UrgentTrigger(func(_ interface{}) error { return gerrors.ErrServerShutdown }, nil)
el.getLogger().Debugf("stopping ticker in event-loop(%d) from Tick(), UrgentTrigger:%v", el.idx, err)
}
if timer == nil {
timer = time.NewTimer(delay)
} else {
timer.Reset(delay)
}
select {
case <-ctx.Done():
el.getLogger().Debugf("stopping ticker in event-loop(%d) from Server, error:%v", el.idx, ctx.Err())
return
case <-timer.C:
}
}
}
func (el *eventloop) handleAction(c *conn, action Action) error {
switch action {
case None:
return nil
case Close:
return el.loopCloseConn(c, nil)
case Shutdown:
return gerrors.ErrServerShutdown
default:
return nil
}
}
func (el *eventloop) loopReadUDP(fd int) error {
n, sa, err := unix.Recvfrom(fd, el.buffer, 0)
if err != nil {
if err == unix.EAGAIN || err == unix.EWOULDBLOCK {
return nil
}
return fmt.Errorf("failed to read UDP packet from fd=%d in event-loop(%d), %v",
fd, el.idx, os.NewSyscallError("recvfrom", err))
}
c := newUDPConn(fd, el, el.ln.lnaddr, sa)
out, action := el.eventHandler.React(el.buffer[:n], c)
if out != nil {
_ = c.sendTo(out)
}
if action == Shutdown {
return gerrors.ErrServerShutdown
}
c.releaseUDP()
return nil
}