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http.go
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http.go
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package mvm
import (
"errors"
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"os/signal"
"golang.org/x/net/websocket"
)
type HttpClient struct {
events chan Event
sync_in chan Event
sync_out chan string
}
func (c *HttpClient) Call(request string) (response Event, err error) {
c.sync_out <- request
var ok bool
response, ok = <-c.sync_in
if !ok {
err = errors.New("Couldn't send the request")
}
return
}
func Start() {
fmt.Println("Loading VM image...")
err := LoadImage()
if err != nil {
fmt.Println("Error while loading VM image:", err)
os.Exit(1)
}
fmt.Println("VM image loaded successfully")
fmt.Println("Starting the VM and WebGUI")
signals := make(chan os.Signal, 1)
signal.Notify(signals, os.Interrupt)
quit := make(chan struct{})
main_chan := make(chan Event)
go func() {
select {
case <-signals:
var e Event
e.Type = "Interrupt"
main_chan <- e
case <-quit:
}
}()
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
fmt.Printf("Requested %s\n", r.RequestURI)
switch r.RequestURI {
case "/":
index, err := ioutil.ReadFile("static/index.html")
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprint(w, err)
return
}
script, err := ioutil.ReadFile("static/script.js")
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprint(w, err)
return
}
_, err = fmt.Fprintf(w, "%s<script>%s</script>", index, script)
if err != nil {
fmt.Printf("Error: %v", err)
}
case "/favicon.ico":
file, err := os.Open("static/favicon.ico")
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprint(w, err)
return
}
_, err = io.Copy(w, file)
if err != nil {
fmt.Printf("Error: %v", err)
}
default:
w.WriteHeader(http.StatusNotFound)
}
})
new_events := make(chan chan Event)
new_sync_in := make(chan chan Event)
new_sync_out := make(chan chan string)
http.Handle("/events", websocket.Handler(func(ws *websocket.Conn) {
events := make(chan Event)
new_events <- events
for {
var e Event
err := websocket.JSON.Receive(ws, &e)
if err != nil {
fmt.Println("Events closed: ", err)
close(events)
return
}
select {
case <-quit:
break
default:
}
select {
case events <- e:
continue
case <-quit:
break
}
}
}))
http.Handle("/sync", websocket.Handler(func(ws *websocket.Conn) {
sync_in := make(chan Event)
sync_out := make(chan string)
new_sync_in <- sync_in
new_sync_out <- sync_out
go func() {
for {
select {
case req := <-sync_out:
err := websocket.Message.Send(ws, req)
if err != nil {
fmt.Println("Sync (out) closed:", err)
close(sync_out)
}
case <-quit:
break
}
}
}()
for {
var e Event
err := websocket.JSON.Receive(ws, &e)
if err != nil {
fmt.Println("Sync (in) closed:", err)
close(sync_in)
return
}
select {
case sync_in <- e:
case <-quit:
break
}
}
}))
go func() {
log.Fatal(http.ListenAndServe("localhost:8000", nil))
}()
// Main loop
go func() {
for {
select { // give priority to main_chan
case e := <-main_chan:
ProcessEvent(e)
default:
select {
case e := <-main_chan:
ProcessEvent(e)
case task := <-tasks:
task.Run(main_chan)
}
}
if !keep_running {
close(quit)
return
}
}
}()
for {
var events chan Event
select {
case events = <-new_events:
case <-quit:
return
}
var sync_in chan Event
select {
case sync_in = <-new_sync_in:
case <-quit:
return
}
var sync_out chan string
select {
case sync_out = <-new_sync_out:
case <-quit:
return
}
fmt.Println("New client connected")
go func() {
client := HttpClient{
events,
sync_in,
sync_out,
}
for {
var e Event
var ok bool
select {
case e, ok = <-events:
if !ok {
fmt.Println("Client disconnected")
return
}
case <-quit:
return
}
e.Client = &client
select {
case main_chan <- e:
case <-quit:
return
}
}
}()
}
}