Optimisation des requêtes js

player/admin.py

@@ -1,3 +1,13 @@
 from django.contrib import admin
+from .models import Playlist, Link
 
-# Register your models here.
+class PlaylistAdmin(admin.ModelAdmin):
+    list_display = ['name', 'date']
+    ordering = ['date']
+
+
+class LinkAdmin(admin.ModelAdmin):
+    pass
+
+admin.site.register(Playlist, PlaylistAdmin)
+admin.site.register(Link, LinkAdmin)

player/forms.py

@@ -1,5 +1,5 @@
 from urllib.parse import urlparse
-import datetime
+import django.utils.timezone as timezone
 
 from django import forms
 
@@ -11,7 +11,9 @@ class PlaylistForm(forms.ModelForm):
         fields = ['name']
 
     def is_valid(self):
-        self.instance.date = datetime.datetime.now()
+        self.instance.date = timezone.now()
+        self.instance.last_get = timezone.now()
+        self.instance.last_update = timezone.now()
         return super().is_valid()
 
 class LinkForm(forms.Form):

player/migrations/0003_auto_20180328_1612.py

@@ -0,0 +1,26 @@
+# Generated by Django 2.0.3 on 2018-03-28 14:12
+
+from django.db import migrations, models
+import django.utils.timezone
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('player', '0002_auto_20180324_2340'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='playlist',
+            name='last_get',
+            field=models.DateTimeField(default=django.utils.timezone.now, verbose_name='Dernière écoute'),
+            preserve_default=False,
+        ),
+        migrations.AddField(
+            model_name='playlist',
+            name='last_update',
+            field=models.DateTimeField(default=django.utils.timezone.now, verbose_name='Dernière mise à jour'),
+            preserve_default=False,
+        ),
+    ]

player/models.py

@@ -9,6 +9,12 @@ class Playlist(models.Model):
         max_length=255,
         verbose_name="Nom de la playlist"
     )
+    last_update = models.DateTimeField(
+        verbose_name="Dernière mise à jour"
+    )
+    last_get = models.DateTimeField(
+        verbose_name="Dernière écoute"
+    )
 
     @staticmethod
     def reverse_token(token):
@@ -36,4 +42,4 @@ class Link(models.Model):
     )
 
     def __str__(self):
-        return "Link : " + self.url + " of " + str(self.playlist)
+        return "Link : " + self.token + " of " + str(self.playlist)

player/templates/player/playlist.html

@@ -53,7 +53,7 @@ var current_link = -1;
 tag.src = "https://www.youtube.com/iframe_api";
 var firstScriptTag = document.getElementsByTagName('script')[0];
 firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
-
+var last_sync = new Date().getTime();
 // 3. This function creates an <iframe> (and YouTube player)
 //    after the API code downloads.
 var player;
@@ -128,6 +128,10 @@ function addLink() {
 	return false;
 }
 function updateLinks(data) {
+	if (!data.updated) {
+		return;
+	}
+	last_sync = new Date().getTime();
 	var links = document.getElementById("links");
 	while (links.firstChild) {
 		    links.removeChild(links.firstChild);
@@ -135,9 +139,9 @@ function updateLinks(data) {
 	var model = document.getElementById('link_template');
     var rerun = (current_link >= tracks.length ) || current_link < 0;
 	tracks = [];
-	for (var i=0; i<data.length; i++)
+	for (var i=0; i<data.tokens.length; i++)
 	{
-        var token = data[i].fields.token;
+        var token = data.tokens[i];
 		tracks.push(token);
 		var card = model.cloneNode(true);
 		card.style.display = 'block';
@@ -161,6 +165,7 @@ function loadLinks() {
 		type: "get",
 		url: "{% url 'player:list' playlist.get_token %}",
 		async: true,
+		data: {last_sync: last_sync},
 		success: updateLinks
 	})
 }

player/views.py

@@ -1,9 +1,10 @@
-import datetime
+import json
 
 from django.shortcuts import render, get_object_or_404, redirect
 from django.http import HttpResponse
 from django.views.decorators.csrf import csrf_exempt
 from django.core.serializers import serialize
+import django.utils.timezone as timezone
 
 from player.models import Playlist, Link
 from player.forms import PlaylistForm, LinkForm
@@ -23,9 +24,17 @@ def new_playlist(request):
 @csrf_exempt
 def get_list(request, token):
     p = get_object_or_404(Playlist, pk=Playlist.reverse_token(token))
+    p.last_get = timezone.now()
+    p.save()
 
-    s = serialize('json', p.link_set.all(), fields=('token',))
-    return HttpResponse(s, content_type='application/json')
+    d = {'tokens':[], 'updated':False}
+    last_up = p.last_update.timestamp()
+    last_sync = (int(request.GET['last_sync'])/1000)
+
+    if p.last_update.timestamp() >= int(request.GET['last_sync'])/1000:
+        d['updated'] = True
+        d['tokens'] = [l.token for l in p.link_set.all()]
+    return HttpResponse(json.dumps(d), content_type='application/json')
 
 
 @csrf_exempt
@@ -33,6 +42,8 @@ def add_link(request, token):
     p = get_object_or_404(Playlist, pk=Playlist.reverse_token(token))
     l = LinkForm(request.POST or None)
     if l.is_valid():
+        p.last_update = timezone.now()
+        p.save()
         yt_token = l.get_token()
         link = Link()
         link.token = yt_token