/
live.go
170 lines (150 loc) · 3.68 KB
/
live.go
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// Copyright 2019 Splitted-Desktop Systems. All rights reserved
// Copyright 2019 Julien Viard de Galbert
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package gotestweb
import (
"bytes"
"io"
"net/http"
"sync"
"time"
"github.com/gorilla/websocket"
)
var (
verbDebug = func(string, ...interface{}) {}
//logDebug = fmt.Printf
logDebug = func(string, ...interface{}) {}
)
// HandleLive adds a websocket http.Handle for /live serving the test json written in the returned WriteCloser.
func HandleLive() io.WriteCloser {
l := newLive()
http.HandleFunc("/live", func(w http.ResponseWriter, r *http.Request) {
ws, err := upgrader.Upgrade(w, r, nil)
if err != nil {
logDebug("%v\n", err)
return
}
logDebug("Client subscribed %v\n", ws.RemoteAddr())
go writer(ws, l)
reader(ws)
logDebug("Client unsubscribed %v\n", ws.RemoteAddr())
})
return l
}
type live struct {
content bytes.Buffer
contentMu sync.RWMutex
clients map[*websocket.Conn]chan int
clientsMu sync.RWMutex
done bool
}
func newLive() *live {
var l live
l.clients = make(map[*websocket.Conn]chan int)
return &l
}
// Write buffers the test input and sent it to the websocket clients
func (l *live) Write(b []byte) (int, error) {
verbDebug("write %d %q\n", len(b), b[len(b)-1])
l.contentMu.Lock()
n, err := l.content.Write(b)
l.contentMu.Unlock()
if err != nil {
return n, err
}
l.clientsMu.RLock()
defer l.clientsMu.RUnlock()
for _, ch := range l.clients {
ch <- l.content.Len()
}
return n, err
}
// Close mark the end of the test run
func (l *live) Close() error {
l.done = true
l.clientsMu.RLock()
defer l.clientsMu.RUnlock()
for _, ch := range l.clients {
ch <- l.content.Len()
}
return nil
}
func (l *live) register(ws *websocket.Conn) chan int {
logDebug("register %v\n", ws.RemoteAddr())
ch := make(chan int)
go func() {
ch <- l.content.Len()
}()
l.clientsMu.Lock()
l.clients[ws] = ch
l.clientsMu.Unlock()
return ch
}
func (l *live) unregister(ws *websocket.Conn) {
logDebug("unregister %v\n", ws.RemoteAddr())
l.clientsMu.Lock()
defer l.clientsMu.Unlock()
ch := l.clients[ws]
close(ch)
delete(l.clients, ws)
}
const (
// Time allowed to write the file to the client.
writeWait = 10 * time.Second
// Time allowed to read the next pong message from the client.
pongWait = 60 * time.Second
// Send pings to client with this period. Must be less than pongWait.
pingPeriod = (pongWait * 9) / 10
)
var upgrader = websocket.Upgrader{}
func reader(ws *websocket.Conn) {
defer ws.Close()
ws.SetReadLimit(512)
ws.SetReadDeadline(time.Now().Add(pongWait))
ws.SetPongHandler(func(string) error { ws.SetReadDeadline(time.Now().Add(pongWait)); return nil })
for {
_, _, err := ws.ReadMessage()
if err != nil {
verbDebug("ReadMessage: %v\n", err)
break
}
}
}
func writer(ws *websocket.Conn, l *live) {
pingTicker := time.NewTicker(pingPeriod)
defer func() {
pingTicker.Stop()
ws.Close()
}()
//ws.WriteMessage(websocket.TextMessage, []byte("Connected !"))
ch := l.register(ws)
defer l.unregister(ws)
var last int
for {
select {
case end := <-ch:
if end > last {
l.contentMu.RLock()
line := l.content.Bytes()[last:end]
last = end
verbDebug("lines %d %q\n", len(line), line[len(line)-1])
err := ws.WriteMessage(websocket.TextMessage, line)
l.contentMu.RUnlock()
if err != nil {
verbDebug("WriteMessage: %v\n", err)
return
}
}
if l.done {
return
}
case <-pingTicker.C:
ws.SetWriteDeadline(time.Now().Add(writeWait))
if err := ws.WriteMessage(websocket.PingMessage, []byte{}); err != nil {
verbDebug("Write PingMessage: %v\n", err)
return
}
}
}
}