Add support for per-course site status.

Now looks for a status_message.json file, looks for 'global' and ${course.id} keys. Return any global message and any course-specific message, joined by <br>.

fab files need to be updated to use this new format (new filename, possibly also help manage per-course messages, or at least test for valid json)

common/djangoapps/status/status.py

@@ -3,27 +3,41 @@ A tiny app that checks for a status message.
 """
 
 from django.conf import settings
+import json
 import logging
 import os
 import sys
 
 log = logging.getLogger(__name__)
 
-def get_site_status_msg():
+def get_site_status_msg(course):
     """
-    Look for a file settings.STATUS_MESSAGE_PATH.  If found, return the
-    contents.  Otherwise, return None.
+    Look for a file settings.STATUS_MESSAGE_PATH.  If found, read it,
+    parse as json, and do the following:
+
+    * if there is a key 'global', include that in the result list.
+    * if course is not None, and there is a key for course.id, add that to the result list.
+    * return "<br/>".join(result)
+
+    Otherwise, return None.
 
     If something goes wrong, returns None.  ("is there a status msg?" logic is
     not allowed to break the entire site).
     """
     try:
-        content = None
         if os.path.isfile(settings.STATUS_MESSAGE_PATH):
             with open(settings.STATUS_MESSAGE_PATH) as f:
                 content = f.read()
+        else:
+            return None
+
+        status_dict = json.loads(content)
+        msg = status_dict.get('global', None)
+        if course and course.id in status_dict:
+            msg = msg + "<br>" if msg else ''
+            msg += status_dict[course.id]
 
-        return content
+        return msg
     except:
         log.exception("Error while getting a status message.")
         return None

common/djangoapps/status/tests.py

+from django.conf import settings
+from django.test import TestCase
+from tempfile import NamedTemporaryFile
+import os
+from override_settings import override_settings
+
+from status import get_site_status_msg
+
+import xmodule.modulestore.django
+from xmodule.modulestore.django import modulestore
+from xmodule.modulestore import Location
+from xmodule.modulestore.xml_importer import import_from_xml
+
+
+class TestStatus(TestCase):
+    """Test that the get_site_status_msg function does the right thing"""
+
+    no_file = None
+
+    invalid_json = """{
+        "global" : "Hello, Globe",
+        }"""
+
+    global_only = """{
+        "global" : "Hello, Globe"
+        }"""
+
+    toy_only = """{
+        "edX/toy/2012_Fall" : "A toy story"
+        }"""
+
+    global_and_toy = """{
+        "global" : "Hello, Globe",
+        "edX/toy/2012_Fall" : "A toy story"
+        }"""
+
+
+    # json to use, expected results for course=None (e.g. homepage),
+    # for toy course, for full course.  Note that get_site_status_msg
+    # is supposed to return global message even if course=None.  The
+    # template just happens to not display it outside the courseware
+    # at the moment...
+    checks = [
+        (no_file, None, None, None),
+        (invalid_json, None, None, None),
+        (global_only, "Hello, Globe", "Hello, Globe", "Hello, Globe"),
+        (toy_only, None, "A toy story", None),
+        (global_and_toy, "Hello, Globe", "Hello, Globe<br>A toy story", "Hello, Globe"),
+        ]
+
+    def setUp(self):
+        xmodule.modulestore.django._MODULESTORES = {}
+        courses = modulestore().get_courses()
+
+        def find_course(course_id):
+            """Assumes the course is present"""
+            return [c for c in courses if c.id==course_id][0]
+
+        self.full = find_course("edX/full/6.002_Spring_2012")
+        self.toy = find_course("edX/toy/2012_Fall")
+
+    def create_status_file(self, contents):
+        """
+        Write contents to settings.STATUS_MESSAGE_PATH.
+        """
+        with open(settings.STATUS_MESSAGE_PATH, 'w') as f:
+            f.write(contents)
+
+    def remove_status_file(self):
+        """Delete the status file if it exists"""
+        if os.path.exists(settings.STATUS_MESSAGE_PATH):
+            os.remove(settings.STATUS_MESSAGE_PATH)
+
+    def tearDown(self):
+        self.remove_status_file()
+
+    def test_get_site_status_msg(self):
+        """run the tests"""
+        for (json_str, exp_none, exp_toy, exp_full) in self.checks:
+
+            self.remove_status_file()
+            if json_str:
+                self.create_status_file(json_str)
+
+            print "checking results for {0}".format(json_str)
+            print "course=None:"
+            self.assertEqual(get_site_status_msg(None), exp_none)
+            print "course=toy:"
+            self.assertEqual(get_site_status_msg(self.toy), exp_toy)
+            print "course=full:"
+            self.assertEqual(get_site_status_msg(self.full), exp_full)

lms/envs/common.py

@@ -129,7 +129,7 @@ NODE_PATH = ':'.join(node_paths)
 
 
 # Where to look for a status message
-STATUS_MESSAGE_PATH = ENV_ROOT / "status_message.html"
+STATUS_MESSAGE_PATH = ENV_ROOT / "status_message.json"
 
 ############################ OpenID Provider  ##################################
 OPENID_PROVIDER_TRUSTED_ROOTS = ['cs50.net', '*.cs50.net']

lms/envs/test.py

@@ -40,6 +40,8 @@ TEST_ROOT = path("test_root")
 # Want static files in the same dir for running on jenkins.
 STATIC_ROOT = TEST_ROOT / "staticfiles"
 
+STATUS_MESSAGE_PATH = TEST_ROOT / "status_message.json"
+
 COURSES_ROOT = TEST_ROOT / "data"
 DATA_DIR = COURSES_ROOT
 
@@ -77,6 +79,19 @@ STATICFILES_DIRS += [
     if os.path.isdir(COMMON_TEST_DATA_ROOT / course_dir)
 ]
 
+# point tests at the test courses by default
+
+MODULESTORE = {
+    'default': {
+        'ENGINE': 'xmodule.modulestore.xml.XMLModuleStore',
+        'OPTIONS': {
+            'data_dir': COMMON_TEST_DATA_ROOT,
+            'default_class': 'xmodule.hidden_module.HiddenDescriptor',
+        }
+    }
+}
+
+
 DATABASES = {
     'default': {
         'ENGINE': 'django.db.backends.sqlite3',

lms/templates/navigation.html

@@ -14,7 +14,12 @@ from status.status import get_site_status_msg
 
 <%block cached="False">
 <%
-site_status_msg = get_site_status_msg()
+try:
+    c = course
+except:
+    # can't figure out a better way to get at a possibly-defined course var
+    c = None
+site_status_msg = get_site_status_msg(c)
 %>
 % if site_status_msg:
 <div class="site-status">