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listener.go
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listener.go
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package zhttp
import (
"errors"
"net"
"os"
"time"
)
// Listener wraps a net.Listener, and gives a place to store the timeout
// parameters. On Accept, it will wrap the net.Conn with our own Conn for us.
// Original implementation taken from https://gist.github.com/jbardin/9663312
// Thanks! <3
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
}
tc := &Conn{
Conn: c,
ReadTimeout: l.ReadTimeout,
WriteTimeout: l.WriteTimeout,
}
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
// closeRecorded will be true if the connection has been closed and the
// corresponding prometheus counter has been decremented. It will be used to
// avoid duplicated modifications to this metric.
closeRecorded bool
}
func (c *Conn) Read(b []byte) (int, error) {
var err error
if c.ReadTimeout > 0 {
err = c.Conn.SetReadDeadline(time.Now().Add(c.ReadTimeout))
} else {
err = c.Conn.SetReadDeadline(time.Time{})
}
if err != nil {
return 0, err
}
return c.Conn.Read(b)
}
func (c *Conn) Write(b []byte) (int, error) {
var err error
if c.WriteTimeout > 0 {
err = c.Conn.SetWriteDeadline(time.Now().Add(c.WriteTimeout))
} else {
err = c.Conn.SetWriteDeadline(time.Time{})
}
if err != nil {
return 0, err
}
return c.Conn.Write(b)
}
func (c *Conn) Close() error {
// Only decremented the prometheus counter if the Close function has not been
// invoked before to avoid duplicated modifications.
if !c.closeRecorded {
c.closeRecorded = true
}
return c.Conn.Close()
}
func NewListener(addr string, readTimeout, writeTimeout time.Duration) (net.Listener, error) {
l, err := net.Listen("tcp", addr)
if err != nil {
return nil, err
}
tl := &Listener{
Listener: l,
ReadTimeout: readTimeout,
WriteTimeout: writeTimeout,
}
return tl, nil
}
// Binds to a UNIX socket. If the file already exists, try to remove it before
// binding again. This logic is borrowed from Gunicorn
// (see https://github.com/benoitc/gunicorn/blob/a8963ef1a5a76f3df75ce477b55fe0297e3b617d/gunicorn/sock.py#L106)
func NewUnixListener(path string, readTimeout, writeTimeout time.Duration) (net.Listener, error) {
stat, err := os.Stat(path)
if err != nil {
if !os.IsNotExist(err) {
return nil, err
}
} else {
if stat.Mode()&os.ModeSocket != 0 {
err = os.Remove(path)
if err != nil {
return nil, err
}
} else {
return nil, errors.New("specified path is not a socket")
}
}
l, err := net.Listen("unix", path)
if err != nil {
return nil, err
}
tl := &Listener{
Listener: l,
ReadTimeout: readTimeout,
WriteTimeout: writeTimeout,
}
return tl, nil
}