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// Copyright (c) 2023 The Gnet Authors. All rights reserved.
//
// 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.
package gnet
import (
"context"
"errors"
"fmt"
"net"
"runtime"
"sync/atomic"
"time"
errorx "github.com/panjf2000/gnet/v2/pkg/errors"
"github.com/panjf2000/gnet/v2/pkg/logging"
"github.com/panjf2000/gnet/v2/pkg/pool/goroutine"
)
type eventloop struct {
ch chan any // channel for event-loop
idx int // index of event-loop in event-loops
eng *engine // engine in loop
connCount int32 // number of active connections in event-loop
connections map[*conn]struct{} // TCP connection map: fd -> conn
eventHandler EventHandler // user eventHandler
}
func (el *eventloop) Register(ctx context.Context, addr net.Addr) (<-chan RegisteredResult, error) {
if el.eng.isShutdown() {
return nil, errorx.ErrEngineInShutdown
}
if addr == nil {
return nil, errorx.ErrInvalidNetworkAddress
}
return el.enroll(nil, addr, FromContext(ctx))
}
func (el *eventloop) Enroll(ctx context.Context, c net.Conn) (<-chan RegisteredResult, error) {
if el.eng.isShutdown() {
return nil, errorx.ErrEngineInShutdown
}
if c == nil {
return nil, errorx.ErrInvalidNetConn
}
return el.enroll(c, c.RemoteAddr(), FromContext(ctx))
}
func (el *eventloop) Execute(ctx context.Context, runnable Runnable) error {
if el.eng.isShutdown() {
return errorx.ErrEngineInShutdown
}
if runnable == nil {
return errorx.ErrNilRunnable
}
return goroutine.DefaultWorkerPool.Submit(func() {
el.ch <- func() error {
return runnable.Run(ctx)
}
})
}
func (el *eventloop) Schedule(context.Context, Runnable, time.Duration) error {
return errorx.ErrUnsupportedOp
}
func (el *eventloop) Close(c Conn) error {
return el.close(c.(*conn), nil)
}
func (el *eventloop) getLogger() logging.Logger {
return el.eng.opts.Logger
}
func (el *eventloop) enroll(c net.Conn, addr net.Addr, ctx any) (resCh chan RegisteredResult, err error) {
resCh = make(chan RegisteredResult, 1)
err = goroutine.DefaultWorkerPool.Submit(func() {
defer close(resCh)
var err error
if c == nil {
if c, err = net.Dial(addr.Network(), addr.String()); err != nil {
resCh <- RegisteredResult{Err: err}
return
}
}
connOpened := make(chan struct{})
var gc *conn
switch addr.Network() {
case "tcp", "tcp4", "tcp6", "unix":
gc = newStreamConn(el, c, ctx)
el.ch <- &openConn{c: gc, cb: func() { close(connOpened) }}
goroutine.DefaultWorkerPool.Submit(func() {
var buffer [0x10000]byte
for {
n, err := c.Read(buffer[:])
if err != nil {
el.ch <- &netErr{gc, err}
return
}
el.ch <- packTCPConn(gc, buffer[:n])
}
})
case "udp", "udp4", "udp6":
gc = newUDPConn(el, nil, c, c.LocalAddr(), c.RemoteAddr(), ctx)
el.ch <- &openConn{c: gc, cb: func() { close(connOpened) }}
goroutine.DefaultWorkerPool.Submit(func() {
var buffer [0x10000]byte
for {
n, err := c.Read(buffer[:])
if err != nil {
el.ch <- &netErr{gc, err}
return
}
gc := newUDPConn(el, nil, c, c.LocalAddr(), c.RemoteAddr(), ctx)
el.ch <- packUDPConn(gc, buffer[:n])
}
})
}
<-connOpened
resCh <- RegisteredResult{Conn: gc}
})
return
}
func (el *eventloop) incConn(delta int32) {
atomic.AddInt32(&el.connCount, delta)
}
func (el *eventloop) countConn() int32 {
return atomic.LoadInt32(&el.connCount)
}
func (el *eventloop) run() (err error) {
defer func() {
el.eng.shutdown(err)
for c := range el.connections {
_ = el.close(c, nil)
}
}()
if el.eng.opts.LockOSThread {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
}
for i := range el.ch {
switch v := i.(type) {
case error:
err = v
case *netErr:
err = el.close(v.c, v.err)
case *openConn:
err = el.open(v)
case *tcpConn:
err = el.read(unpackTCPConn(v))
case *udpConn:
err = el.readUDP(v.c)
case func() error:
err = v()
}
if errors.Is(err, errorx.ErrEngineShutdown) {
el.getLogger().Debugf("event-loop(%d) is exiting in terms of the demand from user, %v", el.idx, err)
break
} else if err != nil {
el.getLogger().Debugf("event-loop(%d) got a nonlethal error: %v", el.idx, err)
}
}
return nil
}
func (el *eventloop) open(oc *openConn) error {
if oc.cb != nil {
defer oc.cb()
}
c := oc.c
el.connections[c] = struct{}{}
el.incConn(1)
out, action := el.eventHandler.OnOpen(c)
if out != nil {
if _, err := c.rawConn.Write(out); err != nil {
return err
}
}
return el.handleAction(c, action)
}
func (el *eventloop) read(c *conn) error {
if _, ok := el.connections[c]; !ok {
return nil // ignore stale wakes.
}
action := el.eventHandler.OnTraffic(c)
switch action {
case None:
case Close:
return el.close(c, nil)
case Shutdown:
return errorx.ErrEngineShutdown
}
_, _ = c.inboundBuffer.Write(c.buffer.B)
c.buffer.Reset()
return nil
}
func (el *eventloop) readUDP(c *conn) error {
action := el.eventHandler.OnTraffic(c)
if action == Shutdown {
return errorx.ErrEngineShutdown
}
c.release()
return nil
}
func (el *eventloop) ticker(ctx context.Context) {
if el == nil {
return
}
var (
action Action
delay time.Duration
timer *time.Timer
)
defer func() {
if timer != nil {
timer.Stop()
}
}()
var shutdown bool
for {
delay, action = el.eventHandler.OnTick()
switch action {
case None, Close:
case Shutdown:
if !shutdown {
shutdown = true
el.ch <- errorx.ErrEngineShutdown
el.getLogger().Debugf("stopping ticker in event-loop(%d) from Tick()", el.idx)
}
}
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) wake(c *conn) error {
if _, ok := el.connections[c]; !ok {
return nil // ignore stale wakes.
}
action := el.eventHandler.OnTraffic(c)
return el.handleAction(c, action)
}
func (el *eventloop) close(c *conn, err error) error {
if _, ok := el.connections[c]; c.rawConn == nil || !ok {
return nil // ignore stale wakes.
}
delete(el.connections, c)
el.incConn(-1)
action := el.eventHandler.OnClose(c, err)
err = c.rawConn.Close()
c.release()
if err != nil {
return fmt.Errorf("failed to close connection=%s in event-loop(%d): %v", c.remoteAddr, el.idx, err)
}
return el.handleAction(c, action)
}
func (el *eventloop) handleAction(c *conn, action Action) error {
switch action {
case None:
return nil
case Close:
return el.close(c, nil)
case Shutdown:
return errorx.ErrEngineShutdown
default:
return nil
}
}