From 2e29a9350306fd94fff19bc02821d7e7ab9c6f8b Mon Sep 17 00:00:00 2001
From: Julien Castiaux <juc@odoo.com>
Date: Mon, 22 Nov 2021 15:22:43 +0000
Subject: [PATCH] [REF] core: remove http.addons_manifest

The http.addons_manifest is a map {module: manifest_dict} that is
populated upon the first http request. This map is basically a module
manifest cache with an extra `addons_path` key, the path of the module
on the file-system. This cache is eagerly populated upon the first http
request, the map is empty in non-http contextes (e.g. cron) which have
been a source of bugs (e.g. 50c8eb1).

A manifest cache is necessary because reading and parsing python files
from the file-system is not that cheap but there is no reason that cache
is located in `odoo.http`. A thin cache layer now wraps
`load_information_from_description_file()`/`load_manifest()` and is
lazily populated.

The `http.addons_manifest` have been removed. The extra `addons_path`
key is now present in the "normal" manifest. The `read_manifest()` was
hardly used so it has been deprecated. The only way to retrieve a
manifest is now `load_information_from_description_file()` which was
renamed `load_manifest()` (no cache) and `get_manifest()` (cache).

Side note about performances, the cache is necessary. Addons manifest
are read-only and reading + parsing python files from the file system is
not a cheap operation. Running the e-commerce tour
`@website_sale.test_04_admin_website_sale_tour` without cache on
`load_manifest()` requires 68,29 secs to complete on my laptop,
exceeding the default 1-minute time frame allowed in tests. Using a
cache the time is down to 36,53 secs. The performance impact is huge.

Part-of: odoo/odoo#79977
---
 addons/base_import_module/models/ir_module.py |   4 +-
 addons/hw_drivers/tools/helpers.py            |   1 -
 addons/web/controllers/main.py                |  13 +-
 addons/web/tests/test_assets.py               |  14 +-
 addons/web_editor/controllers/main.py         |   6 +-
 addons/website/models/website.py              |  12 +-
 odoo/addons/base/models/ir_asset.py           |  23 +--
 odoo/addons/base/models/ir_cron.py            |   2 +-
 odoo/addons/base/models/ir_module.py          |   2 +-
 odoo/addons/base/tests/__init__.py            |   1 +
 odoo/addons/base/tests/test_module.py         |  85 +++++++++
 .../tests/test_assetsbundle.py                |  59 +++---
 odoo/http.py                                  |  26 +--
 odoo/modules/__init__.py                      |   2 +-
 odoo/modules/db.py                            |   2 +-
 odoo/modules/graph.py                         |   5 +-
 odoo/modules/module.py                        | 171 +++++++++++-------
 odoo/tests/common.py                          |  13 ++
 18 files changed, 267 insertions(+), 174 deletions(-)
 create mode 100644 odoo/addons/base/tests/test_module.py

diff --git a/addons/base_import_module/models/ir_module.py b/addons/base_import_module/models/ir_module.py
index 99e12597b5c..3ab7aeb4d68 100644
--- a/addons/base_import_module/models/ir_module.py
+++ b/addons/base_import_module/models/ir_module.py
@@ -12,7 +12,7 @@ from os.path import join as opj
 import odoo
 from odoo import api, fields, models, _
 from odoo.exceptions import UserError
-from odoo.modules import load_information_from_description_file
+from odoo.modules.module import load_manifest
 from odoo.tools import convert_file, exception_to_unicode
 
 _logger = logging.getLogger(__name__)
@@ -37,7 +37,7 @@ class IrModule(models.Model):
         known_mods_names = {m.name: m for m in known_mods}
         installed_mods = [m.name for m in known_mods if m.state == 'installed']
 
-        terp = load_information_from_description_file(module, mod_path=path)
+        terp = load_manifest(module, mod_path=path)
         if not terp:
             return False
         values = self.get_values_from_terp(terp)
diff --git a/addons/hw_drivers/tools/helpers.py b/addons/hw_drivers/tools/helpers.py
index cf4a67b2770..28901368532 100644
--- a/addons/hw_drivers/tools/helpers.py
+++ b/addons/hw_drivers/tools/helpers.py
@@ -266,7 +266,6 @@ def load_iot_handlers():
             if spec:
                 module = util.module_from_spec(spec)
                 spec.loader.exec_module(module)
-    http.addons_manifest = {}
     http.root = http.Root()
 
 def odoo_restart(delay):
diff --git a/addons/web/controllers/main.py b/addons/web/controllers/main.py
index 1dea7b4e1ac..8a27b7d73d9 100644
--- a/addons/web/controllers/main.py
+++ b/addons/web/controllers/main.py
@@ -32,7 +32,7 @@ import odoo
 import odoo.modules.registry
 from odoo.api import call_kw
 from odoo.addons.base.models.qweb import QWeb
-from odoo.modules import get_resource_path, module
+from odoo.modules import get_resource_path, module, get_manifest
 from odoo.tools import html_escape, pycompat, ustr, apply_inheritance_specs, lazy_property, float_repr, osutil
 from odoo.tools.mimetypes import guess_mimetype
 from odoo.tools.translate import _
@@ -331,7 +331,7 @@ def fix_view_modes(action):
 def _local_web_translations(trans_file):
     messages = []
     try:
-        with open(trans_file) as t_file:
+        with file_open(trans_file, filter_ext=('.po')) as t_file:
             po = babel.messages.pofile.read_po(t_file)
     except Exception:
         return
@@ -962,11 +962,10 @@ class WebClient(http.Controller):
 
         translations_per_module = {}
         for addon_name in mods:
-            manifest = http.addons_manifest.get(addon_name)
-            if manifest and manifest.get('bootstrap'):
-                addons_path = http.addons_manifest[addon_name]['addons_path']
-                f_name = os.path.join(addons_path, addon_name, "i18n", lang + ".po")
-                if not os.path.exists(f_name):
+            manifest = get_manifest(addon_name)
+            if manifest and manifest['bootstrap']:
+                f_name = get_resource_path(addon_name, 'i18n', f'{lang}.po')
+                if not f_name:
                     continue
                 translations_per_module[addon_name] = {'messages': _local_web_translations(f_name)}
 
diff --git a/addons/web/tests/test_assets.py b/addons/web/tests/test_assets.py
index bdfbfa9c41c..9c102339ac0 100644
--- a/addons/web/tests/test_assets.py
+++ b/addons/web/tests/test_assets.py
@@ -6,7 +6,7 @@ import time
 import odoo
 import odoo.tests
 
-from odoo.modules.module import read_manifest
+from odoo.modules.module import get_manifest
 from odoo.tools import mute_logger
 
 _logger = logging.getLogger(__name__)
@@ -15,14 +15,12 @@ _logger = logging.getLogger(__name__)
 class TestAssetsGenerateTimeCommon(odoo.tests.TransactionCase):
 
     def generate_bundles(self):
-        bundles = set()
         installed_module_names = self.env['ir.module.module'].search([('state', '=', 'installed')]).mapped('name')
-        for addon_path in odoo.addons.__path__:
-            for addon in installed_module_names:
-                manifest = read_manifest(addon_path, addon) or {}
-                assets = manifest.get('assets')
-                if assets:
-                    bundles |= set(assets.keys())
+        bundles = {
+            key
+            for module in installed_module_names
+            for key in get_manifest(module)['assets']
+        }
 
         for bundle in bundles:
             with mute_logger('odoo.addons.base.models.assetsbundle'):
diff --git a/addons/web_editor/controllers/main.py b/addons/web_editor/controllers/main.py
index fce6212b224..066860dcc75 100644
--- a/addons/web_editor/controllers/main.py
+++ b/addons/web_editor/controllers/main.py
@@ -18,6 +18,7 @@ from odoo.addons.http_routing.models.ir_http import slug, unslug
 from odoo.addons.web_editor.tools import get_video_url_data
 from odoo.exceptions import UserError
 from odoo.modules.module import get_resource_path
+from odoo.tools import file_open
 from odoo.tools.mimetypes import guess_mimetype
 from odoo.tools.image import image_data_uri, base64_to_image
 from odoo.addons.base.models.assetsbundle import AssetsBundle
@@ -56,8 +57,9 @@ class Web_Editor(http.Controller):
         # Make sure we have at least size=1
         size = max(1, min(size, 512))
         # Initialize font
-        addons_path = http.addons_manifest['web']['addons_path']
-        font_obj = ImageFont.truetype(addons_path + font, size)
+        if font.startswith('/'):
+            font = font[1:]
+        font_obj = ImageFont.truetype(file_open(font, 'rb'), size)
 
         # if received character is not a number, keep old behaviour (icon is character)
         icon = chr(int(icon)) if icon.isdigit() else icon
diff --git a/addons/website/models/website.py b/addons/website/models/website.py
index ba97f267009..7f95d721d3a 100644
--- a/addons/website/models/website.py
+++ b/addons/website/models/website.py
@@ -23,7 +23,7 @@ from odoo.addons.portal.controllers.portal import pager
 from odoo.addons.iap.tools import iap_tools
 from odoo.exceptions import UserError, AccessError
 from odoo.http import request
-from odoo.modules.module import get_resource_path
+from odoo.modules.module import get_resource_path, get_manifest
 from odoo.osv.expression import AND, OR, FALSE_DOMAIN, get_unaccent_wrapper
 from odoo.tools.translate import _
 from odoo.tools import escape_psql, pycompat
@@ -296,10 +296,10 @@ class Website(models.Model):
 
     @api.model
     def get_theme_snippet_lists(self, theme_name):
-        default_snippet_lists = http.addons_manifest['theme_default'].get('snippet_lists', {})
-        theme_snippet_lists = http.addons_manifest[theme_name].get('snippet_lists', {})
-        snippet_lists = {**default_snippet_lists, **theme_snippet_lists}
-        return snippet_lists
+        return {
+            **get_manifest('theme_default')['snippet_lists'],
+            **get_manifest(theme_name).get('snippet_lists', {}),
+        }
 
     def configurator_set_menu_links(self, menu_company, module_data):
         menus = self.env['website.menu'].search([('url', 'in', list(module_data.keys())), ('website_id', '=', self.id)])
@@ -339,7 +339,7 @@ class Website(models.Model):
     def configurator_recommended_themes(self, industry_id, palette):
         domain = [('name', '=like', 'theme%'), ('name', 'not in', ['theme_default', 'theme_common'])]
         client_themes = request.env['ir.module.module'].search(domain).mapped('name')
-        client_themes_img = dict([(t, http.addons_manifest[t].get('images_preview_theme', {})) for t in client_themes])
+        client_themes_img = {t: get_manifest(t).get('images_preview_theme', {}) for t in client_themes}
         themes_suggested = self._website_api_rpc(
             '/api/website/2/configurator/recommended_themes/%s' % industry_id,
             {'client_themes': client_themes_img}
diff --git a/odoo/addons/base/models/ir_asset.py b/odoo/addons/base/models/ir_asset.py
index ab74e233ab4..2824801c5a2 100644
--- a/odoo/addons/base/models/ir_asset.py
+++ b/odoo/addons/base/models/ir_asset.py
@@ -1,17 +1,14 @@
-# -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
 import os
-
 from glob import glob
 from logging import getLogger
 from werkzeug import urls
 
 import odoo
+import odoo.modules.module  # get_manifest, don't from-import it
+from odoo import api, fields, models, tools
 from odoo.tools import misc
-from odoo import tools
-from odoo import api, fields, http, models
-from odoo.http import root
 
 _logger = getLogger(__name__)
 
@@ -140,10 +137,6 @@ class IrAsset(models.Model):
         if bundle in seen:
             raise Exception("Circular assets bundle declaration: %s" % " > ".join(seen + [bundle]))
 
-        if not root._loaded:
-            root.load_addons()
-            root._loaded = True
-        manifest_cache = http.addons_manifest
         exts = []
         if js:
             exts += SCRIPT_EXTENSIONS
@@ -163,7 +156,7 @@ class IrAsset(models.Model):
             accordingly.
 
             It is nested inside `_get_asset_paths` since we need the current
-            list of addons, extensions, asset_paths and manifest_cache.
+            list of addons, extensions and asset_paths.
 
             :param directive: string
             :param target: string or None or False
@@ -209,11 +202,7 @@ class IrAsset(models.Model):
 
         # 2. Process all addons' manifests.
         for addon in self._topological_sort(tuple(addons)):
-            manifest = manifest_cache.get(addon)
-            if not manifest:
-                continue
-            manifest_assets = manifest.get('assets', {})
-            for command in manifest_assets.get(bundle, []):
+            for command in odoo.modules.module.get_manifest(addon)['assets'].get(bundle, ()):
                 directive, target, path_def = self._process_command(command)
                 process_path(directive, target, path_def)
 
@@ -269,7 +258,7 @@ class IrAsset(models.Model):
         IrModule = self.env['ir.module.module']
 
         def mapper(addon):
-            manif = http.addons_manifest.get(addon, {})
+            manif = odoo.modules.module.get_manifest(addon)
             from_terp = IrModule.get_values_from_terp(manif)
             from_terp['name'] = addon
             from_terp['depends'] = manif.get('depends', ['base'])
@@ -314,7 +303,7 @@ class IrAsset(models.Model):
         path_url = fs2web(path_def)
         path_parts = [part for part in path_url.split('/') if part]
         addon = path_parts[0]
-        addon_manifest = http.addons_manifest.get(addon)
+        addon_manifest = odoo.modules.module.get_manifest(addon)
 
         safe_path = True
         if addon_manifest:
diff --git a/odoo/addons/base/models/ir_cron.py b/odoo/addons/base/models/ir_cron.py
index 7171ee69746..864e38a0723 100644
--- a/odoo/addons/base/models/ir_cron.py
+++ b/odoo/addons/base/models/ir_cron.py
@@ -14,7 +14,7 @@ from odoo.exceptions import UserError
 
 _logger = logging.getLogger(__name__)
 
-BASE_VERSION = odoo.modules.load_information_from_description_file('base')['version']
+BASE_VERSION = odoo.modules.get_manifest('base')['version']
 MAX_FAIL_TIME = timedelta(hours=5)  # chosen with a fair roll of the dice
 
 
diff --git a/odoo/addons/base/models/ir_module.py b/odoo/addons/base/models/ir_module.py
index 5f46b0d88d5..50e30fcb8e2 100644
--- a/odoo/addons/base/models/ir_module.py
+++ b/odoo/addons/base/models/ir_module.py
@@ -168,7 +168,7 @@ class Module(models.Model):
     @classmethod
     def get_module_info(cls, name):
         try:
-            return modules.load_information_from_description_file(name)
+            return modules.get_manifest(name)
         except Exception:
             _logger.debug('Error when trying to fetch information for module %s', name, exc_info=True)
             return {}
diff --git a/odoo/addons/base/tests/__init__.py b/odoo/addons/base/tests/__init__.py
index 0c72603cb85..05ba4548bde 100644
--- a/odoo/addons/base/tests/__init__.py
+++ b/odoo/addons/base/tests/__init__.py
@@ -27,6 +27,7 @@ from . import test_mail
 from . import test_menu
 from . import test_mimetypes
 from . import test_misc
+from . import test_module
 from . import test_orm
 from . import test_ormcache
 from . import test_osv
diff --git a/odoo/addons/base/tests/test_module.py b/odoo/addons/base/tests/test_module.py
new file mode 100644
index 00000000000..a1f78138fdb
--- /dev/null
+++ b/odoo/addons/base/tests/test_module.py
@@ -0,0 +1,85 @@
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+import os.path
+import tempfile
+from os.path import join as opj
+from unittest.mock import patch
+
+import odoo.addons
+from odoo.modules.module import load_manifest
+from odoo.release import major_version
+from odoo.tests.common import BaseCase
+
+
+class TestModuleManifest(BaseCase):
+    @classmethod
+    def setUpClass(cls):
+        cls._tmp_dir = tempfile.TemporaryDirectory(prefix='odoo-test-addons-')
+        cls.addClassCleanup(cls._tmp_dir.cleanup)
+        cls.addons_path = cls._tmp_dir.name
+
+        patcher = patch.object(odoo.addons, '__path__', [cls.addons_path])
+        patcher.start()
+        cls.addClassCleanup(patcher.stop)
+
+    def setUp(self):
+        self.module_root = tempfile.mkdtemp(prefix='odoo-test-module-', dir=self.addons_path)
+        self.module_name = os.path.basename(self.module_root)
+
+    def test_default_manifest(self):
+        with open(opj(self.module_root, '__manifest__.py'), 'w') as file:
+            file.write(str({'name': f'Temp {self.module_name}', 'license': 'MIT'}))
+
+        with self.assertNoLogs('odoo.modules.module', 'WARNING'):
+            manifest = load_manifest(self.module_name)
+
+        self.maxDiff = None
+        self.assertDictEqual(manifest, {
+            'addons_path': self.addons_path,
+            'application': False,
+            'assets': {},
+            'author': 'Odoo S.A.',
+            'auto_install': False,
+            'bootstrap': False,
+            'category': 'Uncategorized',
+            'data': [],
+            'demo': [],
+            'demo_xml': [],
+            'depends': [],
+            'description': '',
+            'external_dependencies': [],
+            'icon': '/base/static/description/icon.png',
+            'init_xml': [],
+            'installable': True,
+            'images': [],
+            'images_preview_theme': {},
+            'license': 'MIT',
+            'live_test_url': '',
+            'name': f'Temp {self.module_name}',
+            'post_init_hook': '',
+            'post_load': None,
+            'pre_init_hook': '',
+            'sequence': 100,
+            'snippet_lists': {},
+            'summary': '',
+            'test': [],
+            'update_xml': [],
+            'uninstall_hook': '',
+            'version': f'{major_version}.1.0',
+            'web': False,
+            'website': '',
+        })
+
+    def test_missing_manifest(self):
+        with self.assertLogs('odoo.modules.module', 'DEBUG') as capture:
+            manifest = load_manifest(self.module_name)
+        self.assertEqual(manifest, {})
+        self.assertIn("no manifest file found", capture.output[0])
+
+    def test_missing_license(self):
+        with open(opj(self.module_root, '__manifest__.py'), 'w') as file:
+            file.write(str({'name': f'Temp {self.module_name}'}))
+        with self.assertLogs('odoo.modules.module', 'WARNING') as capture:
+            manifest = load_manifest(self.module_name)
+        self.assertEqual(manifest['license'], 'LGPL-3')
+        self.assertIn("Missing `license` key", capture.output[0])
diff --git a/odoo/addons/test_assetsbundle/tests/test_assetsbundle.py b/odoo/addons/test_assetsbundle/tests/test_assetsbundle.py
index 9e9dad8f132..3f669a3135b 100644
--- a/odoo/addons/test_assetsbundle/tests/test_assetsbundle.py
+++ b/odoo/addons/test_assetsbundle/tests/test_assetsbundle.py
@@ -6,18 +6,19 @@ from lxml import etree
 import os
 import time
 from unittest import skip
-from unittest.mock import patch
+from unittest.mock import Mock, patch
 import textwrap
 import pathlib
 import lxml
 import base64
 
+import odoo
 from odoo import api, http
 from odoo.addons import __path__ as ADDONS_PATH
 from odoo.addons.base.models.assetsbundle import AssetsBundle
 from odoo.addons.base.models.ir_asset import AssetPaths
 from odoo.addons.base.models.ir_attachment import IrAttachment
-from odoo.modules.module import get_resource_path, read_manifest
+from odoo.modules.module import get_resource_path, get_manifest
 from odoo.tests import HttpCase, tagged
 from odoo.tests.common import TransactionCase
 from odoo.addons.base.models.qweb import QWebException
@@ -80,33 +81,19 @@ class TestAddonPaths(TransactionCase):
 
 
 class AddonManifestPatched(TransactionCase):
-
-    test_assetsbundle_manifest = None
-    for path in ADDONS_PATH:
-        manifest = read_manifest(path, 'test_assetsbundle')
-        if manifest:
-            manifest['addons_path'] = path
-            test_assetsbundle_manifest = manifest
-            break
-
-    def tearDown(self):
-        super().tearDown()
-        self.env.registry._init_modules = self.__genuine_registry_modules
-        http.addons_manifest = self.__genuine_addons_manifest
-
     def setUp(self):
         super().setUp()
-        self.__genuine_registry_modules = self.env.registry._init_modules
-        self.env.registry._init_modules = func.lazy(lambda: set(self.installed_modules))
 
-        self.__genuine_addons_manifest = http.addons_manifest
-        http.addons_manifest = func.lazy(lambda: self.manifests)
-
-        self.installed_modules = ['base', 'test_assetsbundle']
+        self.installed_modules = {'base', 'test_assetsbundle'}
         self.manifests = {
-            'test_assetsbundle': self.test_assetsbundle_manifest,
+            'base': get_manifest('base'),
+            'web': get_manifest('web'),
+            'test_assetsbundle': get_manifest('test_assetsbundle'),
         }
 
+        self.patch(self.env.registry, '_init_modules', self.installed_modules)
+        self.patch(odoo.modules.module, 'get_manifest', Mock(side_effect=lambda module: self.manifests.get(module, {})))
+
 
 class FileTouchable(AddonManifestPatched):
     def setUp(self):
@@ -1205,7 +1192,7 @@ class TestAssetsManifest(AddonManifestPatched):
         )
 
     def test_14_other_module(self):
-        self.installed_modules.append('test_other')
+        self.installed_modules.add('test_other')
         self.manifests['test_other'] = {
             'name': 'test_other',
             'depends': ['test_assetsbundle'],
@@ -1229,7 +1216,7 @@ class TestAssetsManifest(AddonManifestPatched):
         )
 
     def test_15_other_module_append(self):
-        self.installed_modules.append('test_other')
+        self.installed_modules.add('test_other')
         self.manifests['test_other'] = {
             'name': 'test_other',
             'depends': ['test_assetsbundle'],
@@ -1256,7 +1243,7 @@ class TestAssetsManifest(AddonManifestPatched):
         )
 
     def test_16_other_module_prepend(self):
-        self.installed_modules.append('test_other')
+        self.installed_modules.add('test_other')
         self.manifests['test_other'] = {
             'name': 'test_other',
             'depends': ['test_assetsbundle'],
@@ -1283,7 +1270,7 @@ class TestAssetsManifest(AddonManifestPatched):
         )
 
     def test_17_other_module_replace(self):
-        self.installed_modules.append('test_other')
+        self.installed_modules.add('test_other')
         self.manifests['test_other'] = {
             'name': 'test_other',
             'depends': ['test_assetsbundle'],
@@ -1307,7 +1294,7 @@ class TestAssetsManifest(AddonManifestPatched):
         )
 
     def test_17_other_module_remove(self):
-        self.installed_modules.append('test_other')
+        self.installed_modules.add('test_other')
         self.manifests['test_other'] = {
             'name': 'test_other',
             'depends': ['test_assetsbundle'],
@@ -1332,7 +1319,7 @@ class TestAssetsManifest(AddonManifestPatched):
         )
 
     def test_18_other_module_external(self):
-        self.installed_modules.append('test_other')
+        self.installed_modules.add('test_other')
         self.manifests['test_other'] = {
             'name': 'test_other',
             'depends': ['test_assetsbundle'],
@@ -1431,7 +1418,7 @@ class TestAssetsManifest(AddonManifestPatched):
 
     def test_21_js_before_css(self):
         '''Non existing target node: ignore the manifest line'''
-        self.installed_modules.append('test_other')
+        self.installed_modules.add('test_other')
         self.manifests['test_other'] = {
             'name': 'test_other',
             'depends': ['test_assetsbundle'],
@@ -1461,7 +1448,7 @@ class TestAssetsManifest(AddonManifestPatched):
         )
 
     def test_22_js_before_js(self):
-        self.installed_modules.append('test_other')
+        self.installed_modules.add('test_other')
         self.manifests['test_other'] = {
             'name': 'test_other',
             'depends': ['test_assetsbundle'],
@@ -1495,7 +1482,7 @@ class TestAssetsManifest(AddonManifestPatched):
 
     def test_23_js_after_css(self):
         '''Non existing target node: ignore the manifest line'''
-        self.installed_modules.append('test_other')
+        self.installed_modules.add('test_other')
         self.manifests['test_other'] = {
             'name': 'test_other',
             'depends': ['test_assetsbundle'],
@@ -1525,7 +1512,7 @@ class TestAssetsManifest(AddonManifestPatched):
         )
 
     def test_24_js_after_js(self):
-        self.installed_modules.append('test_other')
+        self.installed_modules.add('test_other')
         self.manifests['test_other'] = {
             'name': 'test_other',
             'depends': ['test_assetsbundle'],
@@ -1785,7 +1772,7 @@ class TestAssetsManifest(AddonManifestPatched):
             'path': '/test_assetsbundle/%s' % path_to_dummy,
         })
 
-        files = self.env['ir.asset']._get_asset_paths('test_assetsbundle.irassetsec', addons=self.installed_modules, xml=False)
+        files = self.env['ir.asset']._get_asset_paths('test_assetsbundle.irassetsec', addons=list(self.installed_modules), xml=False)
         self.assertFalse(files)
 
     def test_33(self):
@@ -1834,7 +1821,7 @@ class TestAssetsManifest(AddonManifestPatched):
             'bundle': 'test_assetsbundle.irassetsec',
             'path': '/test_assetsbundle/data/ir_asset.xml',
         })
-        files = self.env['ir.asset']._get_asset_paths('test_assetsbundle.irassetsec', addons=self.installed_modules, xml=False)
+        files = self.env['ir.asset']._get_asset_paths('test_assetsbundle.irassetsec', addons=list(self.installed_modules), xml=False)
         self.assertFalse(files)
 
     def test_36(self):
@@ -1843,7 +1830,7 @@ class TestAssetsManifest(AddonManifestPatched):
             'bundle': 'test_assetsbundle.irassetsec',
             'path': '/test_assetsbundle/static/accessible.xml',
         })
-        files = self.env['ir.asset']._get_asset_paths('test_assetsbundle.irassetsec', addons=self.installed_modules, xml=False)
+        files = self.env['ir.asset']._get_asset_paths('test_assetsbundle.irassetsec', addons=list(self.installed_modules), xml=False)
         self.assertEqual(len(files), 1)
         self.assertTrue('test_assetsbundle/static/accessible.xml' in files[0][0])
 
diff --git a/odoo/http.py b/odoo/http.py
index a6b01e5cb8d..20f59ffc1c7 100644
--- a/odoo/http.py
+++ b/odoo/http.py
@@ -56,7 +56,7 @@ from .tools import ustr, consteq, frozendict, pycompat, unique, date_utils
 from .tools.mimetypes import guess_mimetype
 from .tools.misc import str2bool
 from .tools._vendor import sessions
-from .modules.module import read_manifest
+from .modules.module import get_manifest
 
 _logger = logging.getLogger(__name__)
 rpc_request = logging.getLogger(__name__ + '.rpc.request')
@@ -860,7 +860,6 @@ more details.
 #----------------------------------------------------------
 # Controller and route registration
 #----------------------------------------------------------
-addons_manifest = {}
 controllers_per_module = collections.defaultdict(list)
 
 class ControllerType(type):
@@ -1316,22 +1315,15 @@ class Root(object):
         controllers and configure them.  """
         # TODO should we move this to ir.http so that only configured modules are served ?
         statics = {}
-        manifests = addons_manifest
         for addons_path in odoo.addons.__path__:
-            for module in sorted(os.listdir(str(addons_path))):
-                if module not in manifests:
-                    # Deal with the manifest first
-                    mod_path = opj(addons_path, module)
-                    manifest = read_manifest(addons_path, module)
-                    if not manifest or (not manifest.get('installable', True) and 'assets' not in manifest):
-                        continue
-                    manifest['addons_path'] = addons_path
-                    manifests[module] = manifest
-                    # Then deal with the statics
-                    path_static = opj(addons_path, module, 'static')
-                    if os.path.isdir(path_static):
-                        _logger.debug("Loading %s", module)
-                        statics['/%s/static' % module] = path_static
+            for module in os.listdir(addons_path):
+                manifest = get_manifest(module)
+                static_path = opj(addons_path, module, 'static')
+                if (manifest
+                        and manifest['installable']
+                        and manifest['assets']
+                        and os.path.isdir(static_path)):
+                    statics[f'/{module}/static'] = static_path
 
         if statics:
             _logger.info("HTTP Configuring static files")
diff --git a/odoo/modules/__init__.py b/odoo/modules/__init__.py
index 3a754a4e171..4203a92a102 100644
--- a/odoo/modules/__init__.py
+++ b/odoo/modules/__init__.py
@@ -19,6 +19,6 @@ from odoo.modules.module import (
     get_resource_path,
     check_resource_path,
     initialize_sys_path,
-    load_information_from_description_file,
+    get_manifest,
     load_openerp_module,
 )
diff --git a/odoo/modules/db.py b/odoo/modules/db.py
index fda05783e56..475205cdfc0 100644
--- a/odoo/modules/db.py
+++ b/odoo/modules/db.py
@@ -37,7 +37,7 @@ def initialize(cr):
             continue
 
         # This will raise an exception if no/unreadable descriptor file.
-        info = odoo.modules.load_information_from_description_file(i)
+        info = odoo.modules.get_manifest(i)
 
         if not info:
             continue
diff --git a/odoo/modules/graph.py b/odoo/modules/graph.py
index 664212ec84a..efe8629b466 100644
--- a/odoo/modules/graph.py
+++ b/odoo/modules/graph.py
@@ -58,10 +58,7 @@ class Graph(dict):
         packages = []
         len_graph = len(self)
         for module in module_list:
-            # This will raise an exception if no/unreadable descriptor file.
-            # NOTE The call to load_information_from_description_file is already
-            # done by db.initialize, so it is possible to not do it again here.
-            info = odoo.modules.module.load_information_from_description_file(module)
+            info = odoo.modules.module.get_manifest(module)
             if info and info['installable']:
                 packages.append((module, info)) # TODO directly a dict, like in get_modules_with_version
             elif module != 'studio_customization':
diff --git a/odoo/modules/module.py b/odoo/modules/module.py
index 32af0b256ab..1b60622653b 100644
--- a/odoo/modules/module.py
+++ b/odoo/modules/module.py
@@ -3,6 +3,8 @@
 
 import ast
 import collections.abc
+import copy
+import functools
 import importlib
 import logging
 import os
@@ -10,7 +12,7 @@ import pkg_resources
 import re
 import sys
 import warnings
-from os.path import join as opj
+from os.path import join as opj, realpath
 
 import odoo
 import odoo.tools as tools
@@ -20,6 +22,42 @@ from odoo.tools import pycompat
 MANIFEST_NAMES = ('__manifest__.py', '__openerp__.py')
 README = ['README.rst', 'README.md', 'README.txt']
 
+_DEFAULT_MANIFEST = {
+    #addons_path: f'/path/to/the/addons/path/of/{module}',  # automatic
+    'application': False,
+    'bootstrap': False,  # web
+    'assets': {},
+    'author': 'Odoo S.A.',
+    'auto_install': False,
+    'category': 'Uncategorized',
+    'data': [],
+    'demo': [],
+    'demo_xml': [],
+    'depends': [],
+    'description': '',
+    'external_dependencies': [],
+    #icon: f'/{module}/static/description/icon.png',  # automatic
+    'init_xml': [],
+    'installable': True,
+    'images': [],  # website
+    'images_preview_theme': {},  # website themes
+    #license, mandatory
+    'live_test_url': '',  # website themes
+    #name, mandatory
+    'post_init_hook': '',
+    'post_load': None,
+    'pre_init_hook': '',
+    'sequence': 100,
+    'snippet_lists': {},  # website themes
+    'summary': '',
+    'test': [],
+    'update_xml': [],
+    'uninstall_hook': '',
+    'version': '1.0',
+    'web': False,
+    'website': '',
+}
+
 _logger = logging.getLogger(__name__)
 
 # addons path as a list
@@ -276,14 +314,6 @@ def module_manifest(path):
         if os.path.isfile(opj(path, manifest_name)):
             return opj(path, manifest_name)
 
-def read_manifest(addons_path, module):
-    mod_path = opj(addons_path, module)
-    manifest_path = module_manifest(mod_path)
-    if manifest_path:
-        with tools.file_open(manifest_path, 'r') as fd:
-            manifest_data = fd.read()
-        return ast.literal_eval(manifest_data)
-
 def get_module_root(path):
     """
     Get closest module's root beginning from path
@@ -311,74 +341,75 @@ def get_module_root(path):
         path = new_path
     return path
 
-def load_information_from_description_file(module, mod_path=None):
-    """
-    :param module: The name of the module (sale, purchase, ...)
-    :param mod_path: Physical path of module, if not providedThe name of the module (sale, purchase, ...)
-    """
+def load_manifest(module, mod_path=None):
+    """ Load the module manifest from the file system. """
+
     if not mod_path:
         mod_path = get_module_path(module, downloaded=True)
     manifest_file = module_manifest(mod_path)
-    if manifest_file:
-        # default values for descriptor
-        info = {
-            'application': False,
-            'author': 'Odoo S.A.',
-            'auto_install': False,
-            'category': 'Uncategorized',
-            'depends': [],
-            'description': '',
-            'icon': get_module_icon(module),
-            'installable': True,
-            'post_load': None,
-            'version': '1.0',
-            'web': False,
-            'sequence': 100,
-            'summary': '',
-            'website': '',
-        }
-        info.update(zip(
-            'depends data demo test init_xml update_xml demo_xml'.split(),
-            iter(list, None)))
 
-        f = tools.file_open(manifest_file, mode='rb')
-        try:
-            info.update(ast.literal_eval(pycompat.to_text(f.read())))
-        finally:
-            f.close()
+    if not manifest_file:
+        _logger.debug('module %s: no manifest file found %s', module, MANIFEST_NAMES)
+        return {}
 
-        if not info.get('description'):
-            readme_path = [opj(mod_path, x) for x in README
-                           if os.path.isfile(opj(mod_path, x))]
-            if readme_path:
-                with tools.file_open(readme_path[0]) as fd:
-                    info['description'] = fd.read()
+    manifest = copy.deepcopy(_DEFAULT_MANIFEST)
+    manifest['icon'] = get_module_icon(module)
 
-        if not info.get('license'):
-            info['license'] = 'LGPL-3'
-            _logger.warning("Missing `license` key in manifest for '%s', defaulting to LGPL-3", module)
+    with tools.file_open(manifest_file, mode='r') as f:
+        manifest.update(ast.literal_eval(f.read()))
 
-        # auto_install is either `False` (by default) in which case the module
-        # is opt-in, either a list of dependencies in which case the module is
-        # automatically installed if all dependencies are (special case: [] to
-        # always install the module), either `True` to auto-install the module
-        # in case all dependencies declared in `depends` are installed.
-        if isinstance(info['auto_install'], collections.abc.Iterable):
-            info['auto_install'] = set(info['auto_install'])
-            non_dependencies = info['auto_install'].difference(info['depends'])
-            assert not non_dependencies,\
-                "auto_install triggers must be dependencies, found " \
-                "non-dependencies [%s] for module %s" % (
-                    ', '.join(non_dependencies), module
-                )
-        elif info['auto_install']:
-            info['auto_install'] = set(info['depends'])
+    if not manifest['description']:
+        readme_path = [opj(mod_path, x) for x in README
+                       if os.path.isfile(opj(mod_path, x))]
+        if readme_path:
+            with tools.file_open(readme_path[0]) as fd:
+                manifest['description'] = fd.read()
 
-        info['version'] = adapt_version(info['version'])
-        return info
+    if not manifest.get('license'):
+        manifest['license'] = 'LGPL-3'
+        _logger.warning("Missing `license` key in manifest for %r, defaulting to LGPL-3", module)
 
-    _logger.debug('module %s: no manifest file found %s', module, MANIFEST_NAMES)
-    return {}
+    # auto_install is either `False` (by default) in which case the module
+    # is opt-in, either a list of dependencies in which case the module is
+    # automatically installed if all dependencies are (special case: [] to
+    # always install the module), either `True` to auto-install the module
+    # in case all dependencies declared in `depends` are installed.
+    if isinstance(manifest['auto_install'], collections.abc.Iterable):
+        manifest['auto_install'] = set(manifest['auto_install'])
+        non_dependencies = manifest['auto_install'].difference(manifest['depends'])
+        assert not non_dependencies,\
+            "auto_install triggers must be dependencies, found " \
+            "non-dependencies [%s] for module %s" % (
+                ', '.join(non_dependencies), module
+            )
+    elif manifest['auto_install']:
+        manifest['auto_install'] = set(manifest['depends'])
+
+    manifest['version'] = adapt_version(manifest['version'])
+    manifest['addons_path'] = realpath(opj(mod_path, os.pardir))
+
+    return manifest
+
+@functools.lru_cache(maxsize=None)
+def get_manifest(module, mod_path=None):
+    """
+    Get the module manifest.
+
+    :param str module: The name of the module (sale, purchase, ...).
+    :param Optional[str] mod_path: The optional path to the module on
+        the file-system. If not set, it is determined by scanning the
+        addons-paths.
+    :returns: The module manifest as a dict or an empty dict
+        when the manifest was not found.
+    :rtype: dict
+    """
+    return load_manifest(module, mod_path)
+
+def load_information_from_description_file(module, mod_path=None):
+    warnings.warn(
+        'load_information_from_description_file() is a deprecated '
+        'alias to get_manifest()', DeprecationWarning, stacklevel=2)
+    return get_manifest(module, mod_path)
 
 def load_openerp_module(module_name):
     """ Load an OpenERP module, if not already loaded.
@@ -398,7 +429,7 @@ def load_openerp_module(module_name):
         # Call the module's post-load hook. This can done before any model or
         # data has been initialized. This is ok as the post-load hook is for
         # server-wide (instead of registry-specific) functionalities.
-        info = load_information_from_description_file(module_name)
+        info = get_manifest(module_name)
         if info['post_load']:
             getattr(sys.modules['odoo.addons.' + module_name], info['post_load'])()
 
@@ -440,7 +471,7 @@ def get_modules_with_version():
     res = dict.fromkeys(modules, adapt_version('1.0'))
     for module in modules:
         try:
-            info = load_information_from_description_file(module)
+            info = get_manifest(module)
             res[module] = info['version']
         except Exception:
             continue
diff --git a/odoo/tests/common.py b/odoo/tests/common.py
index 96a021ea92a..e918223de26 100644
--- a/odoo/tests/common.py
+++ b/odoo/tests/common.py
@@ -455,6 +455,19 @@ class BaseCase(unittest.TestCase, metaclass=MetaCase):
         else:
             return self._assertRaises(exception, **kwargs)
 
+    if sys.version_info < (3, 10):
+        # simplified backport of assertNoLogs()
+        @contextmanager
+        def assertNoLogs(self, logger: str, level: str):
+            # assertLogs ensures there is at least one log record when
+            # exiting the context manager. We insert one dummy record just
+            # so we pass that silly test while still capturing the logs.
+            with self.assertLogs(logger, level) as capture:
+                logging.getLogger(logger).log(getattr(logging, level), "Dummy log record")
+                yield
+                if len(capture.output) > 1:
+                    raise self.failureException(f"Unexpected logs found: {capture.output[1:]}")
+
     @contextmanager
     def assertQueries(self, expected, flush=True):
         """ Check the queries made by the current cursor. ``expected`` is a list