Brendan LE GLAUNEC
120 lines
2.8 KiB
Go
120 lines
2.8 KiB
Go
// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package websocket
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import (
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"fmt"
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"time"
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gorilla "github.com/gorilla/websocket"
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)
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// Gorilla implements WebSocket interface using Gorilla library
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type Gorilla struct {
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conn *gorilla.Conn
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accessToken string
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input chan interface{}
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output chan interface{}
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}
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// AccessToken returns the user authentication token
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func (g *Gorilla) AccessToken() string {
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return g.accessToken
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}
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// Write return a chan to retrieve websocket inputs
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func (g *Gorilla) Read() <-chan interface{} {
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return g.input
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}
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// Write returns a chan to write on websocket
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func (g *Gorilla) Write() chan<- interface{} {
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return g.output
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}
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func (g *Gorilla) read(readLimit int64, pongWait time.Duration) {
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defer (func() {
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g.conn.Close()
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close(g.input)
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})()
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// setup read to timeout if no pong is received after `pongWait`
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g.conn.SetReadDeadline(time.Now().Add(pongWait))
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g.conn.SetPongHandler(func(string) error {
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g.conn.SetReadDeadline(time.Now().Add(pongWait))
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return nil
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})
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g.conn.SetReadLimit(readLimit)
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for {
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messageType, message, err := g.conn.ReadMessage()
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if err != nil {
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if _, ok := err.(*gorilla.CloseError); ok {
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fmt.Printf("ws connection closed from %v (%v)\n", g.conn.RemoteAddr(), err)
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} else {
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// most of the time, a read error is not an error (connection closed, ...)
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fmt.Printf("ws read error: %v\n", err)
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}
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break
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}
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switch messageType {
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case gorilla.TextMessage:
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g.input <- string(message)
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case gorilla.BinaryMessage:
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g.input <- message
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default:
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fmt.Printf("received invalid message type: %v\n", messageType)
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}
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}
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}
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func (g *Gorilla) pingAndWrite(pingInterval time.Duration) {
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defer g.conn.Close()
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pinger := time.NewTicker(pingInterval)
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for {
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select {
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case <-pinger.C:
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if err := g.conn.WriteMessage(gorilla.PingMessage, []byte{}); err != nil {
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fmt.Printf("ping write error: %v\n", err)
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return
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}
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case message, ok := <-g.output:
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if !ok {
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// chan closed, stop write routine
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return
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}
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var err error
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switch msg := message.(type) {
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case []byte:
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err = g.conn.WriteMessage(gorilla.BinaryMessage, msg)
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case string:
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err = g.conn.WriteMessage(gorilla.TextMessage, []byte(msg))
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default:
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err = fmt.Errorf("invalid message type: %T", msg)
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}
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if err != nil {
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fmt.Printf("write error: %v\n", err)
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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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