ceremonyclient/go-libp2p/p2p/transport/websocket/conn.go
2023-08-20 23:07:43 -05:00

165 lines
3.2 KiB
Go

package websocket
import (
"io"
"net"
"sync"
"time"
"github.com/libp2p/go-libp2p/core/network"
"github.com/libp2p/go-libp2p/core/transport"
ws "github.com/gorilla/websocket"
)
// GracefulCloseTimeout is the time to wait trying to gracefully close a
// connection before simply cutting it.
var GracefulCloseTimeout = 100 * time.Millisecond
// Conn implements net.Conn interface for gorilla/websocket.
type Conn struct {
*ws.Conn
secure bool
DefaultMessageType int
reader io.Reader
closeOnce sync.Once
readLock, writeLock sync.Mutex
}
var _ net.Conn = (*Conn)(nil)
// NewConn creates a Conn given a regular gorilla/websocket Conn.
func NewConn(raw *ws.Conn, secure bool) *Conn {
return &Conn{
Conn: raw,
secure: secure,
DefaultMessageType: ws.BinaryMessage,
}
}
func (c *Conn) Read(b []byte) (int, error) {
c.readLock.Lock()
defer c.readLock.Unlock()
if c.reader == nil {
if err := c.prepNextReader(); err != nil {
return 0, err
}
}
for {
n, err := c.reader.Read(b)
switch err {
case io.EOF:
c.reader = nil
if n > 0 {
return n, nil
}
if err := c.prepNextReader(); err != nil {
return 0, err
}
// explicitly looping
default:
return n, err
}
}
}
func (c *Conn) prepNextReader() error {
t, r, err := c.Conn.NextReader()
if err != nil {
if wserr, ok := err.(*ws.CloseError); ok {
if wserr.Code == 1000 || wserr.Code == 1005 {
return io.EOF
}
}
return err
}
if t == ws.CloseMessage {
return io.EOF
}
c.reader = r
return nil
}
func (c *Conn) Write(b []byte) (n int, err error) {
c.writeLock.Lock()
defer c.writeLock.Unlock()
if err := c.Conn.WriteMessage(c.DefaultMessageType, b); err != nil {
return 0, err
}
return len(b), nil
}
// Close closes the connection. Only the first call to Close will receive the
// close error, subsequent and concurrent calls will return nil.
// This method is thread-safe.
func (c *Conn) Close() error {
var err error
c.closeOnce.Do(func() {
err1 := c.Conn.WriteControl(
ws.CloseMessage,
ws.FormatCloseMessage(ws.CloseNormalClosure, "closed"),
time.Now().Add(GracefulCloseTimeout),
)
err2 := c.Conn.Close()
switch {
case err1 != nil:
err = err1
case err2 != nil:
err = err2
}
})
return err
}
func (c *Conn) LocalAddr() net.Addr {
return NewAddrWithScheme(c.Conn.LocalAddr().String(), c.secure)
}
func (c *Conn) RemoteAddr() net.Addr {
return NewAddrWithScheme(c.Conn.RemoteAddr().String(), c.secure)
}
func (c *Conn) SetDeadline(t time.Time) error {
if err := c.SetReadDeadline(t); err != nil {
return err
}
return c.SetWriteDeadline(t)
}
func (c *Conn) SetReadDeadline(t time.Time) error {
// Don't lock when setting the read deadline. That would prevent us from
// interrupting an in-progress read.
return c.Conn.SetReadDeadline(t)
}
func (c *Conn) SetWriteDeadline(t time.Time) error {
// Unlike the read deadline, we need to lock when setting the write
// deadline.
c.writeLock.Lock()
defer c.writeLock.Unlock()
return c.Conn.SetWriteDeadline(t)
}
type capableConn struct {
transport.CapableConn
}
func (c *capableConn) ConnState() network.ConnectionState {
cs := c.CapableConn.ConnState()
cs.Transport = "websocket"
return cs
}