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ws_conn.go
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ws_conn.go
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package internal
import (
"fmt"
"net"
"sync"
"time"
"github.com/andyollylarkin/smudge-custom-transport/transport"
"github.com/gorilla/websocket"
)
// WsConnAdapter adapter (wrapper) around web socket connection for correspond net.Conn interface.
type WsConnAdapter struct {
SocketConn *websocket.Conn
realRemoteAddr net.Addr
mu sync.Mutex
}
func NewWsConn(conn *websocket.Conn, realRemoteAddr net.Addr) *WsConnAdapter {
wsc := new(WsConnAdapter)
wsc.SocketConn = conn
wsc.realRemoteAddr = realRemoteAddr
return wsc
}
func (wsc *WsConnAdapter) ReadFrom(b []byte) (n int, addr transport.SockAddr, err error) {
n, err = wsc.Read(b)
if err != nil {
return
}
sockAddr := wsc.SocketConn.RemoteAddr()
tcpAddr, ok := sockAddr.(*net.TCPAddr)
if !ok {
return 0, nil, fmt.Errorf("cant resolve ws tcp addr. RemoteAddr() socket is not TCP Addr")
}
wsAddr := &WsAddr{WsAddrTCP: *tcpAddr}
return n, wsAddr, nil
}
// Read reads data from the connection.
// Read can be made to time out and return an error after a fixed
// time limit; see SetDeadline and SetReadDeadline.
func (wsc *WsConnAdapter) Read(b []byte) (n int, err error) {
t, r, err := wsc.SocketConn.NextReader()
if err != nil {
return 0, err
}
if t != websocket.TextMessage {
return 0, fmt.Errorf("invalid websocket message type. Require text message")
}
return r.Read(b)
}
// Write writes data to the connection.
// Write can be made to time out and return an error after a fixed
// time limit; see SetDeadline and SetWriteDeadline.
func (wsc *WsConnAdapter) Write(b []byte) (n int, err error) {
wsc.mu.Lock()
defer wsc.mu.Unlock()
err = wsc.SocketConn.WriteMessage(websocket.TextMessage, b)
if err != nil {
return 0, err
}
return len(b), err
}
// Close closes the connection.
// Any blocked Read or Write operations will be unblocked and return errors.
// **NOTICE** this function do nothing, because we don't want the connection to be closed after every data transfer.
func (wsc *WsConnAdapter) Close() error {
return nil
}
// ActuallyClose actyally close websocket connection.
func (wsc *WsConnAdapter) ActuallyClose() error {
return wsc.SocketConn.Close()
}
// LocalAddr returns the local network address, if known.
func (wsc *WsConnAdapter) LocalAddr() net.Addr {
return wsc.SocketConn.LocalAddr()
}
// RemoteAddr returns the remote network address, if known.
func (wsc *WsConnAdapter) RemoteAddr() net.Addr {
return wsc.realRemoteAddr
}
// SetDeadline sets the read and write deadlines associated
// with the connection. It is equivalent to calling both
// SetReadDeadline and SetWriteDeadline.
//
// A deadline is an absolute time after which I/O operations
// fail instead of blocking. The deadline applies to all future
// and pending I/O, not just the immediately following call to
// Read or Write. After a deadline has been exceeded, the
// connection can be refreshed by setting a deadline in the future.
//
// If the deadline is exceeded a call to Read or Write or to other
// I/O methods will return an error that wraps os.ErrDeadlineExceeded.
// This can be tested using errors.Is(err, os.ErrDeadlineExceeded).
// The error's Timeout method will return true, but note that there
// are other possible errors for which the Timeout method will
// return true even if the deadline has not been exceeded.
//
// An idle timeout can be implemented by repeatedly extending
// the deadline after successful Read or Write calls.
//
// A zero value for t means I/O operations will not time out.
func (wsc *WsConnAdapter) SetDeadline(t time.Time) error {
return nil
}
// SetReadDeadline sets the deadline for future Read calls
// and any currently-blocked Read call.
// A zero value for t means Read will not time out.
func (wsc *WsConnAdapter) SetReadDeadline(t time.Time) error {
return wsc.SocketConn.SetReadDeadline(t)
}
// SetWriteDeadline sets the deadline for future Write calls
// and any currently-blocked Write call.
// Even if write times out, it may return n > 0, indicating that
// some of the data was successfully written.
// A zero value for t means Write will not time out.
func (wsc *WsConnAdapter) SetWriteDeadline(t time.Time) error {
return wsc.SocketConn.SetWriteDeadline(t)
}