97 lines
2.3 KiB
Go
97 lines
2.3 KiB
Go
package main
|
|
|
|
import (
|
|
"log"
|
|
"net"
|
|
"sync/atomic"
|
|
"time"
|
|
)
|
|
|
|
type listener struct {
|
|
net.Listener
|
|
ReadTimeout time.Duration
|
|
WriteTimeout time.Duration
|
|
}
|
|
|
|
func (l *listener) Accept() (net.Conn, error) {
|
|
c, err := l.Listener.Accept()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if tcpConnection, ok := c.(*net.TCPConn); ok {
|
|
tcpConnection.SetReadBuffer(1024 * 64)
|
|
tcpConnection.SetWriteBuffer(1024 * 64)
|
|
tcpConnection.SetKeepAlive(true)
|
|
tcpConnection.SetKeepAlivePeriod(l.WriteTimeout / 4)
|
|
tcpConnection.SetNoDelay(true)
|
|
tcpConnection.SetLinger(0)
|
|
}
|
|
|
|
log.Printf("accepted new connection from %s\n", c.RemoteAddr().String())
|
|
tc := &Conn{
|
|
Conn: c,
|
|
ReadTimeout: l.ReadTimeout,
|
|
WriteTimeout: l.WriteTimeout,
|
|
ReadThreshold: int32((l.ReadTimeout * 1024) / time.Second),
|
|
WriteThreshold: int32((l.WriteTimeout * 1024) / time.Second),
|
|
}
|
|
return tc, nil
|
|
}
|
|
|
|
// Conn wraps a net.Conn, and sets a deadline for every read
|
|
// and write operation.
|
|
type Conn struct {
|
|
net.Conn
|
|
ReadTimeout time.Duration
|
|
WriteTimeout time.Duration
|
|
ReadThreshold int32
|
|
WriteThreshold int32
|
|
BytesReadFromDeadline atomic.Int32
|
|
BytesWrittenFromDeadline atomic.Int32
|
|
}
|
|
|
|
func (c *Conn) Read(b []byte) (n int, err error) {
|
|
if c.BytesReadFromDeadline.Load() > c.ReadThreshold {
|
|
c.BytesReadFromDeadline.Store(0)
|
|
// we set both read and write deadlines here otherwise after the request
|
|
// is read writing the response fails with an i/o timeout error
|
|
err = c.Conn.SetDeadline(time.Now().Add(c.ReadTimeout))
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
}
|
|
n, err = c.Conn.Read(b)
|
|
c.BytesReadFromDeadline.Add(int32(n))
|
|
return
|
|
}
|
|
|
|
func (c *Conn) Write(b []byte) (n int, err error) {
|
|
if c.BytesWrittenFromDeadline.Load() > c.WriteThreshold {
|
|
c.BytesWrittenFromDeadline.Store(0)
|
|
// we extend the read deadline too, not sure it's necessary,
|
|
// but it doesn't hurt
|
|
err = c.Conn.SetDeadline(time.Now().Add(c.WriteTimeout))
|
|
if err != nil {
|
|
return
|
|
}
|
|
}
|
|
n, err = c.Conn.Write(b)
|
|
c.BytesWrittenFromDeadline.Add(int32(n))
|
|
return
|
|
}
|
|
|
|
func newListener(network, addr string, readTimeout, writeTimeout time.Duration) (net.Listener, error) {
|
|
l, err := net.Listen(network, addr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
tl := &listener{
|
|
Listener: l,
|
|
ReadTimeout: readTimeout,
|
|
WriteTimeout: writeTimeout,
|
|
}
|
|
return tl, nil
|
|
}
|