112 lines
2.4 KiB
Go
112 lines
2.4 KiB
Go
package websocket
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import (
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"log"
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"time"
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"github.com/google/uuid"
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"github.com/gorilla/websocket"
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)
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const (
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// Time allowed to write a message to the peer.
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writeWait = 10 * time.Second
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// Time allowed to read the next pong message from the peer.
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pongWait = 60 * time.Second
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// Send pings to peer with this period. Must be less than pongWait.
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pingPeriod = (pongWait * 9) / 10
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// Maximum message size allowed from peer.
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maxMessageSize = 1024
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)
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func NewClient(conn *websocket.Conn, hub *Hub) (*Client, error) {
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clientID := uuid.New()
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return &Client{
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id: clientID.String(),
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conn: conn,
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hub: hub,
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send: make(chan []byte, 100),
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}, nil
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}
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type Client struct {
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id string
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conn *websocket.Conn
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// Buffered channel of outbound messages.
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send chan []byte
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hub *Hub
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}
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func (c *Client) Go() {
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go c.clientReader()
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go c.clientWriter()
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}
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// clientReader waits for options changes from the client. The client can at any time
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// change the log level and binary name it watches.
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func (c *Client) clientReader() {
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defer func() {
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c.hub.unregister <- c
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c.conn.Close()
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}()
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c.conn.SetReadLimit(maxMessageSize)
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if err := c.conn.SetReadDeadline(time.Now().Add(pongWait)); err != nil {
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log.Printf("failed to set read deadline: %s", err)
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}
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c.conn.SetPongHandler(func(string) error {
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if err := c.conn.SetReadDeadline(time.Now().Add(pongWait)); err != nil {
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return err
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}
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return nil
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})
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for {
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mt, _, err := c.conn.ReadMessage()
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if err != nil {
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break
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}
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if mt == websocket.CloseMessage {
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break
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}
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}
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}
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// clientWriter
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func (c *Client) clientWriter() {
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ticker := time.NewTicker(pingPeriod)
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defer func() {
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ticker.Stop()
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c.conn.Close()
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}()
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for {
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select {
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case message, ok := <-c.send:
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if err := c.conn.SetWriteDeadline(time.Now().Add(writeWait)); err != nil {
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log.Printf("failed to set write deadline: %s", err)
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}
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if !ok {
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// The hub closed the channel.
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if err := c.conn.WriteMessage(websocket.CloseMessage, []byte{}); err != nil {
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log.Printf("failed to write message: %s", err)
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}
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return
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}
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if err := c.conn.WriteMessage(websocket.TextMessage, message); err != nil {
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log.Printf("error sending message: %v", err)
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return
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}
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case <-ticker.C:
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if err := c.conn.SetWriteDeadline(time.Now().Add(writeWait)); err != nil {
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log.Printf("failed to set write deadline: %s", err)
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}
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if err := c.conn.WriteMessage(websocket.PingMessage, nil); err != nil {
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return
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}
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}
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}
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}
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