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conn.go
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conn.go
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/*
* Copyright 2023 the go-netty project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package nettyws
import (
"bytes"
"context"
"net/http"
"time"
"github.com/go-netty/go-netty"
"github.com/go-netty/go-netty/utils"
"github.com/gobwas/ws/wsutil"
)
// Conn is a websocket connection.
type Conn interface {
// Context returns the context of the connection.
Context() context.Context
// LocalAddr returns the local network address.
LocalAddr() string
// RemoteAddr returns the remote network address.
RemoteAddr() string
// Header returns the HTTP header on handshake request.
Header() http.Header
// SetDeadline sets the read and write deadlines associated
// with the connection. It is equivalent to calling both
// SetReadDeadline and SetWriteDeadline.
SetDeadline(t time.Time) error
// 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.
SetReadDeadline(t time.Time) error
// 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.
SetWriteDeadline(t time.Time) error
// Write writes a message to the connection.
Write(message []byte) error
// WriteClose write websocket close frame with code and close reason.
WriteClose(code int, reason string) error
// Close closes the connection.
Close() error
// Userdata returns the user-data.
Userdata() interface{}
// SetUserdata sets the user-data.
SetUserdata(userdata interface{})
}
type wsc interface {
WriteClose(code int, reason string) error
}
type wsh interface {
Route() string
Header() http.Header
}
type wsConn struct {
ws *Websocket
channel netty.Channel
client bool
userdata interface{}
}
// newConn create a websocket connection.
func newConn(ws *Websocket, channel netty.Channel, client bool) Conn {
return &wsConn{ws: ws, channel: channel, client: client}
}
// Context returns the context of the connection.
func (c *wsConn) Context() context.Context {
return c.channel.Context()
}
// LocalAddr returns the local network address.
func (c *wsConn) LocalAddr() string {
return c.channel.LocalAddr()
}
// RemoteAddr returns the remote network address.
func (c *wsConn) RemoteAddr() string {
return c.channel.RemoteAddr()
}
// Header returns the HTTP header on handshake request.
func (c *wsConn) Header() http.Header {
return c.channel.Transport().(wsh).Header()
}
// SetDeadline sets the read and write deadlines associated
// with the connection. It is equivalent to calling both
// SetReadDeadline and SetWriteDeadline.
func (c *wsConn) SetDeadline(t time.Time) error {
return c.channel.Transport().SetDeadline(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.channel.Transport().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.channel.Transport().SetWriteDeadline(t)
}
// Write writes a message to the connection.
func (c *wsConn) Write(message []byte) error {
_, err := c.channel.Write1(message)
return err
}
// WriteClose write websocket close frame with code and close reason.
func (c *wsConn) WriteClose(code int, reason string) error {
return c.channel.Transport().(wsc).WriteClose(code, reason)
}
// Close closes the connection.
func (c *wsConn) Close() error {
c.channel.Close(nil)
return nil
}
// Userdata returns the user-data.
func (c *wsConn) Userdata() interface{} {
return c.userdata
}
// SetUserdata sets the user-data.
func (c *wsConn) SetUserdata(userdata interface{}) {
c.userdata = userdata
}
func (c *wsConn) HandleActive(ctx netty.ActiveContext) {
if onOpen := c.ws.OnOpen; nil != onOpen {
onOpen(c)
return
}
ctx.HandleActive()
}
func (c *wsConn) HandleRead(ctx netty.InboundContext, message netty.Message) {
var reader = utils.MustToReader(message)
var buffer = bytes.NewBuffer(make([]byte, 0, 1024))
for {
// reset buffer
buffer.Reset()
// read message to buffer
if _, err := buffer.ReadFrom(reader); nil != err {
// interrupted network read loop
panic(err)
}
// invoke OnData callback
if onData := c.ws.OnData; onData != nil {
onData(c, buffer.Bytes())
}
// TODO: recreate large buffer for reduce memory usage
//
}
}
func (c *wsConn) HandleException(ctx netty.ExceptionContext, ex netty.Exception) {
ctx.Close(ex)
}
func (c *wsConn) HandleInactive(ctx netty.InactiveContext, ex netty.Exception) {
// covert error
if closeErr, ok := ex.(wsutil.ClosedError); ok {
ex = ClosedError{Code: int(closeErr.Code), Reason: closeErr.Reason}
}
if onClose := c.ws.OnClose; nil != onClose {
onClose(c, ex)
return
}
ctx.HandleInactive(ex)
}