/
listener.go
153 lines (138 loc) · 2.81 KB
/
listener.go
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package listener
import (
"net"
"sync/atomic"
"time"
"github.com/lesismal/arpc/log"
)
type event struct {
err error
conn net.Conn
}
type Listener struct {
logtag string
listener net.Listener
onlineA int32
onlineB int32
maxOnlineA int32
chEventA chan event
chEventB chan event
}
func (l *Listener) Accept() (net.Conn, error) {
c, err := l.listener.Accept()
return c, err
}
func (l *Listener) Close() error {
if l.listener == nil {
return nil
}
close(l.chEventA)
close(l.chEventB)
return l.listener.Close()
}
// Addr returns the listener's network address.
func (l *Listener) Addr() net.Addr {
if l.listener == nil {
return nil
}
return l.listener.Addr()
}
func (l *Listener) Listeners() (net.Listener, net.Listener) {
return &ChanListener{
addr: l.listener.Addr(),
chEvent: l.chEventA,
}, &ChanListener{
addr: l.listener.Addr(),
chEvent: l.chEventB,
}
}
func (l *Listener) OfflineA() {
atomic.AddInt32(&l.onlineA, -1)
}
func (l *Listener) Run() {
tempSleep := time.Duration(0)
maxSleep := time.Second
for {
c, err := l.Accept()
if err != nil {
if ne, ok := err.(net.Error); ok && ne.Temporary() {
log.Error("%v Accept error: %v; retrying...", l.logtag, err)
if tempSleep == 0 {
tempSleep = time.Millisecond * 20
} else {
tempSleep *= 2
}
if tempSleep > maxSleep {
tempSleep = maxSleep
}
time.Sleep(tempSleep)
} else {
log.Error("%v Accept error: %v", l.logtag, err)
return
}
} else {
if atomic.AddInt32(&l.onlineA, 1) <= l.maxOnlineA {
func() {
// avoid conn leak when close
defer func() {
if err := recover(); err != nil {
c.Close()
}
}()
l.chEventA <- event{err: nil, conn: c}
}()
} else {
atomic.AddInt32(&l.onlineA, -1)
// avoid conn leak when close
func() {
defer func() {
if err := recover(); err != nil {
c.Close()
}
}()
l.chEventB <- event{err: nil, conn: c}
}()
}
tempSleep = 0
}
}
}
func Listen(network, addr string, maxOnlineA int, logtag string) (*Listener, error) {
l, err := net.Listen(network, addr)
if err != nil {
return nil, err
}
if maxOnlineA < 0 {
maxOnlineA = 0
}
if logtag == "" {
logtag = "[ARPC SVR]"
}
return &Listener{
logtag: logtag,
listener: l,
onlineA: 0,
onlineB: 0,
maxOnlineA: int32(maxOnlineA),
chEventA: make(chan event, 4096),
chEventB: make(chan event, 4096),
}, nil
}
type ChanListener struct {
addr net.Addr
chEvent chan event
}
func (l *ChanListener) Accept() (net.Conn, error) {
e, ok := <-l.chEvent
if !ok {
return nil, net.ErrClosed
}
return e.conn, e.err
}
func (l *ChanListener) Close() error {
return nil
}
// Addr returns the listener's network address.
func (l *ChanListener) Addr() net.Addr {
return l.addr
}