chore: use thread safe fifo stack

Author: AniolFernandez

app-server/dockercontroller.go

@@ -17,11 +17,13 @@ import (
 )
 
 const pullDelay = 1 * time.Minute
-var display int=99
+var displayStack = &TF_FIFOStack{}
 
 //Ens permet arrancar docker de forma asyncrona
 func StartDockerImage(imageName string, port string, volume string, close chan struct{}){
-	log.Println("Inicialitzant el contenidor (D:",display," P:",port,")...")
+    display := displayStack.Pop()
+    defer displayStack.Push(display)
+    log.Println("Inicialitzant el contenidor (D:",display," P:",port,")...")
 	//Obté docker API
 	dockerCli, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())
 	if err != nil {
@@ -60,7 +62,6 @@ func StartDockerImage(imageName string, port string, volume string, close chan s
 		log.Println("Error en crear el contenidor de la imatge de docker", err)
 		return
 	}
-    display = display+1
 
 	// Inicia el contenidor
 	if err := dockerCli.ContainerStart(context.Background(), resp.ID, types.ContainerStartOptions{}); err != nil {

app-server/main.go

@@ -31,6 +31,7 @@ func Initialize(){
     KeepAlive()
     InitializeVolumes()
     UpdateImages()
+    fillStack(displayStack)
 }
 
 func RedirectHandler(w http.ResponseWriter, r *http.Request) {

app-server/tf-fifo-stack.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"sync"
+)
+
+type TF_FIFOStack struct {
+	lock  sync.Mutex
+	stack []int
+}
+
+func (s *TF_FIFOStack) Push(x int) {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+	s.stack = append(s.stack, x)
+}
+
+func (s *TF_FIFOStack) Pop() (int) {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+	if len(s.stack) == 0 {
+		return 0
+	}
+	x := s.stack[0]
+	s.stack = s.stack[1:]
+	return x
+}
+
+func fillStack(s *TF_FIFOStack){
+	for i := 100; i <= 10000; i++ {
+		s.Push(i)
+	}
+}