cloudflared-mirror/websocket/connection.go

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package websocket
import (
"context"
"io"
"time"
"github.com/rs/zerolog"
gobwas "github.com/gobwas/ws"
"github.com/gobwas/ws/wsutil"
"github.com/gorilla/websocket"
)
const (
// Time allowed to write a message to the peer.
writeWait = 10 * time.Second
// Time allowed to read the next pong message from the peer.
pongWait = 60 * time.Second
// Send pings to peer with this period. Must be less than pongWait.
pingPeriod = (pongWait * 9) / 10
)
// GorillaConn is a wrapper around the standard gorilla websocket but implements a ReadWriter
// This is still used by access carrier
type GorillaConn struct {
*websocket.Conn
log *zerolog.Logger
}
// Read will read messages from the websocket connection
func (c *GorillaConn) Read(p []byte) (int, error) {
_, message, err := c.Conn.ReadMessage()
if err != nil {
return 0, err
}
return copy(p, message), nil
}
// Write will write messages to the websocket connection
func (c *GorillaConn) Write(p []byte) (int, error) {
if err := c.Conn.WriteMessage(websocket.BinaryMessage, p); err != nil {
return 0, err
}
return len(p), nil
}
// pinger simulates the websocket connection to keep it alive
func (c *GorillaConn) pinger(ctx context.Context) {
ticker := time.NewTicker(pingPeriod)
defer ticker.Stop()
for {
select {
case <-ticker.C:
if err := c.WriteControl(websocket.PingMessage, []byte{}, time.Now().Add(writeWait)); err != nil {
c.log.Debug().Msgf("failed to send ping message: %s", err)
}
case <-ctx.Done():
return
}
}
}
type Conn struct {
rw io.ReadWriter
log *zerolog.Logger
}
func NewConn(ctx context.Context, rw io.ReadWriter, log *zerolog.Logger) *Conn {
c := &Conn{
rw: rw,
log: log,
}
go c.pinger(ctx)
return c
}
// Read will read messages from the websocket connection
func (c *Conn) Read(reader []byte) (int, error) {
data, err := wsutil.ReadClientBinary(c.rw)
if err != nil {
return 0, err
}
return copy(reader, data), nil
}
// Write will write messages to the websocket connection
func (c *Conn) Write(p []byte) (int, error) {
if err := wsutil.WriteServerBinary(c.rw, p); err != nil {
return 0, err
}
return len(p), nil
}
func (c *Conn) pinger(ctx context.Context) {
pongMessge := wsutil.Message{
OpCode: gobwas.OpPong,
Payload: []byte{},
}
ticker := time.NewTicker(pingPeriod)
defer ticker.Stop()
for {
select {
case <-ticker.C:
if err := wsutil.WriteServerMessage(c.rw, gobwas.OpPing, []byte{}); err != nil {
c.log.Err(err).Msgf("failed to write ping message")
}
if err := wsutil.HandleClientControlMessage(c.rw, pongMessge); err != nil {
c.log.Err(err).Msgf("failed to write pong message")
}
case <-ctx.Done():
return
}
}
}