#1: Add broadcaster structure to broadcast results of the same usernames

api/mojang/queue/broadcast.go

@@ -0,0 +1,53 @@
+package queue
+
+import (
+	"sync"
+
+	"github.com/elyby/chrly/api/mojang"
+)
+
+type broadcastMap struct {
+	lock      sync.Mutex
+	listeners map[string][]chan *mojang.SignedTexturesResponse
+}
+
+func newBroadcaster() *broadcastMap {
+	return &broadcastMap{
+		listeners: make(map[string][]chan *mojang.SignedTexturesResponse),
+	}
+}
+
+// Returns a boolean value, which will be true if the username passed didn't exist before
+func (c *broadcastMap) AddListener(username string, resultChan chan *mojang.SignedTexturesResponse) bool {
+	c.lock.Lock()
+	defer c.lock.Unlock()
+
+	val, alreadyHasSource := c.listeners[username]
+	if alreadyHasSource {
+		c.listeners[username] = append(val, resultChan)
+		return false
+	}
+
+	c.listeners[username] = []chan *mojang.SignedTexturesResponse{resultChan}
+
+	return true
+}
+
+func (c *broadcastMap) BroadcastAndRemove(username string, result *mojang.SignedTexturesResponse) {
+	c.lock.Lock()
+	defer c.lock.Unlock()
+
+	val, ok := c.listeners[username]
+	if !ok {
+		return
+	}
+
+	for _, channel := range val {
+		go func(channel chan *mojang.SignedTexturesResponse) {
+			channel <- result
+			close(channel)
+		}(channel)
+	}
+
+	delete(c.listeners, username)
+}