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ngs/cluster/ws.go

117 lines
3.1 KiB
Go

package cluster
import (
"github.com/gorilla/websocket"
"io"
"net"
"time"
)
// wsConn is an adapter to t.Conn, which implements all t.Conn
// interface base on *websocket.Conn
type wsConn struct {
conn *websocket.Conn
typ int // message type
reader io.Reader
}
// newWSConn return an initialized *wsConn
func newWSConn(conn *websocket.Conn) (*wsConn, error) {
c := &wsConn{conn: conn}
t, r, err := conn.NextReader()
if err != nil {
return nil, err
}
c.typ = t
c.reader = r
return c, nil
}
// Read reads data from the connection.
// Read can be made to time out and return an Error with Timeout() == true
// after a fixed time limit; see SetDeadline and SetReadDeadline.
func (c *wsConn) Read(b []byte) (int, error) {
n, err := c.reader.Read(b)
if err != nil && err != io.EOF {
return n, err
} else if err == io.EOF {
_, r, err := c.conn.NextReader()
if err != nil {
return 0, err
}
c.reader = r
}
return n, nil
}
// Write writes data to the connection.
// Write can be made to time out and return an Error with Timeout() == true
// after a fixed time limit; see SetDeadline and SetWriteDeadline.
func (c *wsConn) Write(b []byte) (int, error) {
err := c.conn.WriteMessage(websocket.BinaryMessage, b)
if err != nil {
return 0, err
}
return len(b), nil
}
// Close closes the connection.
// Any blocked Read or Write operations will be unblocked and return errors.
func (c *wsConn) Close() error {
return c.conn.Close()
}
// LocalAddr returns the local network address.
func (c *wsConn) LocalAddr() net.Addr {
return c.conn.LocalAddr()
}
// RemoteAddr returns the remote network address.
func (c *wsConn) RemoteAddr() net.Addr {
return c.conn.RemoteAddr()
}
// 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 with a timeout (see type Error) 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.
//
// 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 (c *wsConn) SetDeadline(t time.Time) error {
if err := c.conn.SetReadDeadline(t); err != nil {
return err
}
return c.conn.SetWriteDeadline(t)
}
// 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 (c *wsConn) SetReadDeadline(t time.Time) error {
return c.conn.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 (c *wsConn) SetWriteDeadline(t time.Time) error {
return c.conn.SetWriteDeadline(t)
}