bitbake: toaster: reduce redundant foreign key lookups

Replace redundant foreign key lookups with "with" to improve all
recipes page load time. Do depends pre-lookup in the view class,
and use python itertation instead of filter() all to achieve x16
processing speedup.

[YOCTO #6137]

(Bitbake rev: a68a6dc50c11cc59e7c873414e3e22ac2644dea7)

Signed-off-by: David Reyna <David.Reyna@windriver.com>
Signed-off-by: Alexandru DAMIAN <alexandru.damian@intel.com>

Conflicts:
	bitbake/lib/toaster/toastergui/views.py
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/toaster/toastergui/templates/recipes.html

@@ -45,31 +45,39 @@
         <td><a href="{% url "recipe" build.pk recipe.pk %}">{{recipe.version}}</a></td>
         <!-- Depends -->
         <td class="depends_on">
-            {% if recipe.r_dependencies_recipe.all.count %}
+            {% with deps=recipe_deps|get_dict_value:recipe.pk %}
+            {% with count=deps|length %}
+            {% if count %}
             <a class="btn"
                 title="<a href='{% url "recipe" build.pk recipe.pk %}#dependencies'>{{recipe.name}}</a> dependencies"
                 data-content="<ul class='unstyled'>
-                  {% for i in recipe.r_dependencies_recipe.all|dictsort:"depends_on.name"%}
+                  {% for i in deps|dictsort:"depends_on.name"%}
                     <li><a href='{% url "recipe" build.pk i.depends_on.pk %}'>{{i.depends_on.name}}</a></li>
                   {% endfor %}
                 </ul>">
-                {{recipe.r_dependencies_recipe.all.count}}
+                {{count}}
             </a>
             {% endif %}
+            {% endwith %}
+            {% endwith %}
         </td>
         <!--  Brought in by -->
         <td class="depends_by">
-            {% if recipe.r_dependencies_depends.all.count %}
+            {% with revs=recipe_revs|get_dict_value:recipe.pk %}
+            {% with count=revs|length %}
+            {% if count %}
             <a class="btn"
                 title="<a href='{% url "recipe" build.pk recipe.pk %}#brought-in-by'>{{recipe.name}}</a> reverse dependencies"
                 data-content="<ul class='unstyled'>
-                  {% for i in recipe.r_dependencies_depends.all|dictsort:"recipe.name"%}
+                  {% for i in revs|dictsort:"recipe.name" %}
                     <li><a href='{% url "recipe" build.pk i.recipe.pk %}'>{{i.recipe.name}}</a></li>
                   {% endfor %}
                 </ul>">
-                {{recipe.r_dependencies_depends.all.count}}
+                {{count}}
             </a>
             {% endif %}
+            {% endwith %}
+            {% endwith %}
         </td>
         <!-- Recipe file -->
         <td class="recipe_file">{{recipe.file_path}}</td>

bitbake/lib/toaster/toastergui/views.py

@@ -1074,11 +1074,26 @@ def recipes(request, build_id):
 
     recipes = _build_page_range(Paginator(queryset, request.GET.get('count', 100)),request.GET.get('page', 1))
 
+    # prefetch the forward and reverse recipe dependencies
+    deps = { }; revs = { }
+    queryset_dependency=Recipe_Dependency.objects.filter(recipe__layer_version__build_id = build_id)
+    for recipe in recipes:
+        deplist = [ ]
+        for recipe_dep in [x for x in queryset_dependency if x.recipe_id == recipe.id]:
+            deplist.append(recipe_dep)
+        deps[recipe.id] = deplist
+        revlist = [ ]
+        for recipe_dep in [x for x in queryset_dependency if x.depends_on_id == recipe.id]:
+            revlist.append(recipe_dep)
+        revs[recipe.id] = revlist
+
     context = {
         'objectname': 'recipes',
         'build': Build.objects.filter(pk=build_id)[0],
         'objects': recipes,
         'default_orderby' : 'name:+',
+        'recipe_deps' : deps,
+        'recipe_revs' : revs,
         'tablecols':[
             {
                 'name':'Recipe',