Auto-restart the draw socket on close

Signed-off-by: Emmy D'Anello <emmy.danello@animath.fr>

draw/static/draw.js

@@ -108,12 +108,6 @@ document.addEventListener('DOMContentLoaded', () => {
         elem => elem.addEventListener(
             'click', () => document.location.hash = '#' + elem.innerText.toLowerCase()))
 
-    // Open a global websocket
-    socket = new WebSocket(
-        (document.location.protocol === 'https:' ? 'wss' : 'ws') + '://' + window.location.host
-        + '/ws/draw/'
-    )
-
     /**
      * Add alert message on the top on the interface.
      * @param message The content of the alert.
@@ -750,41 +744,51 @@ document.addEventListener('DOMContentLoaded', () => {
         }
     }
 
-    // Listen on websockets and process messages from the server
-    socket.addEventListener('message', e => {
-        // Parse received data as JSON
-        const data = JSON.parse(e.data)
+    function setupSocket() {
+        // Open a global websocket
+        socket = new WebSocket(
+            (document.location.protocol === 'https:' ? 'wss' : 'ws') + '://' + window.location.host + '/ws/draw/'
+        )
 
-        processMessage(data['tid'], data)
-    })
+        // Listen on websockets and process messages from the server
+        socket.addEventListener('message', e => {
+            // Parse received data as JSON
+            const data = JSON.parse(e.data)
 
-    // Manage errors
-    socket.addEventListener('close', e => {
-        console.error('Chat socket closed unexpectedly')
-    })
+            processMessage(data['tid'], data)
+        })
 
-    // When the socket is opened, set the language in order to receive alerts in the good language
-    socket.addEventListener('open', e => {
-        socket.send(JSON.stringify({
-            'tid': tournaments[0].id,
-            'type': 'set_language',
-            'language': document.getElementsByName('language')[0].value,
-        }))
-    })
+        // Manage errors
+        socket.addEventListener('close', e => {
+            console.error('Chat socket closed unexpectedly, restarting…')
+            setupSocket()
+        })
 
-    for (let tournament of tournaments) {
-        // Manage the start form
-        let format_form = document.getElementById('format-form-' + tournament.id)
-        if (format_form !== null) {
-            format_form.addEventListener('submit', function (e) {
-                e.preventDefault()
+        // When the socket is opened, set the language in order to receive alerts in the good language
+        socket.addEventListener('open', e => {
+            socket.send(JSON.stringify({
+                'tid': tournaments[0].id,
+                'type': 'set_language',
+                'language': document.getElementsByName('language')[0].value,
+            }))
+        })
 
-                socket.send(JSON.stringify({
-                    'tid': tournament.id,
-                    'type': 'start_draw',
-                    'fmt': document.getElementById('format-' + tournament.id).value
-                }))
-            })
+        for (let tournament of tournaments) {
+            // Manage the start form
+            let format_form = document.getElementById('format-form-' + tournament.id)
+            if (format_form !== null) {
+                format_form.addEventListener('submit', function (e) {
+                    e.preventDefault()
+
+                    socket.send(JSON.stringify({
+                        'tid': tournament.id,
+                        'type': 'start_draw',
+                        'fmt': document.getElementById('format-' + tournament.id).value
+                    }))
+                })
+            }
         }
     }
+
+    setupSocket()
 })