131 lines
2.3 KiB
Go
131 lines
2.3 KiB
Go
package main
|
|
|
|
import (
|
|
"bufio"
|
|
"fmt"
|
|
"github.com/gorilla/websocket"
|
|
"github.com/opentracing/opentracing-go/log"
|
|
"io"
|
|
"net/http"
|
|
"strings"
|
|
"sync"
|
|
)
|
|
|
|
type outmux struct {
|
|
lk sync.Mutex
|
|
|
|
errpw *io.PipeWriter
|
|
outpw *io.PipeWriter
|
|
|
|
errpr *io.PipeReader
|
|
outpr *io.PipeReader
|
|
|
|
n uint64
|
|
outs map[uint64]*websocket.Conn
|
|
|
|
new chan *websocket.Conn
|
|
stop chan struct{}
|
|
}
|
|
|
|
func newWsMux() *outmux {
|
|
out := &outmux{
|
|
n: 0,
|
|
outs: map[uint64]*websocket.Conn{},
|
|
new: make(chan *websocket.Conn),
|
|
stop: make(chan struct{}),
|
|
}
|
|
|
|
out.outpr, out.outpw = io.Pipe()
|
|
out.errpr, out.errpw = io.Pipe()
|
|
|
|
go out.run()
|
|
|
|
return out
|
|
}
|
|
|
|
func (m *outmux) msgsToChan(r *io.PipeReader, ch chan []byte) {
|
|
defer close(ch)
|
|
br := bufio.NewReader(r)
|
|
|
|
for {
|
|
buf, _, err := br.ReadLine()
|
|
if err != nil {
|
|
return
|
|
}
|
|
out := make([]byte, len(buf)+1)
|
|
copy(out, buf)
|
|
out[len(out)-1] = '\n'
|
|
|
|
select {
|
|
case ch <- out:
|
|
case <-m.stop:
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func (m *outmux) run() {
|
|
stdout := make(chan []byte)
|
|
stderr := make(chan []byte)
|
|
go m.msgsToChan(m.outpr, stdout)
|
|
go m.msgsToChan(m.errpr, stderr)
|
|
|
|
for {
|
|
select {
|
|
case msg := <-stdout:
|
|
for k, out := range m.outs {
|
|
if err := out.WriteMessage(websocket.BinaryMessage, msg); err != nil {
|
|
out.Close()
|
|
fmt.Printf("outmux write failed: %s\n", err)
|
|
delete(m.outs, k)
|
|
}
|
|
}
|
|
case msg := <-stderr:
|
|
for k, out := range m.outs {
|
|
if err := out.WriteMessage(websocket.BinaryMessage, msg); err != nil {
|
|
out.Close()
|
|
fmt.Printf("outmux write failed: %s\n", err)
|
|
delete(m.outs, k)
|
|
}
|
|
}
|
|
case c := <-m.new:
|
|
m.n++
|
|
m.outs[m.n] = c
|
|
case <-m.stop:
|
|
for _, out := range m.outs {
|
|
out.Close()
|
|
}
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
var upgrader = websocket.Upgrader{
|
|
CheckOrigin: func(r *http.Request) bool {
|
|
return true
|
|
},
|
|
}
|
|
|
|
func (m *outmux) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
|
if !strings.Contains(r.Header.Get("Connection"), "Upgrade") {
|
|
fmt.Println("noupgrade")
|
|
w.WriteHeader(500)
|
|
return
|
|
}
|
|
|
|
w.Header().Set("Access-Control-Allow-Origin", "*")
|
|
if r.Header.Get("Sec-WebSocket-Protocol") != "" {
|
|
w.Header().Set("Sec-WebSocket-Protocol", r.Header.Get("Sec-WebSocket-Protocol"))
|
|
}
|
|
|
|
c, err := upgrader.Upgrade(w, r, nil)
|
|
if err != nil {
|
|
log.Error(err)
|
|
w.WriteHeader(500)
|
|
return
|
|
}
|
|
|
|
m.new <- c
|
|
return
|
|
}
|