From ed6a8f68ac7c422dfd198ea1a582d186d4a3da53 Mon Sep 17 00:00:00 2001
From: Victor Shnayder <victor@mitx.mit.edu>
Date: Mon, 19 Nov 2012 10:04:56 -0500
Subject: [PATCH] starting to stub out the backend staff grading service [wip]

---
 .../instructor/staff_grading_service.py       | 57 +++++++++++++++++++
 lms/urls.py                                   |  4 ++
 2 files changed, 61 insertions(+)
 create mode 100644 lms/djangoapps/instructor/staff_grading_service.py

diff --git a/lms/djangoapps/instructor/staff_grading_service.py b/lms/djangoapps/instructor/staff_grading_service.py
new file mode 100644
index 0000000000..d4a4d82e63
--- /dev/null
+++ b/lms/djangoapps/instructor/staff_grading_service.py
@@ -0,0 +1,57 @@
+"""
+This module provides views that proxy to the staff grading backend service.
+"""
+
+import json
+import requests
+import sys
+
+from django.http import Http404
+from django.http import HttpResponse
+
+
+from util.json_request import expect_json
+
+class GradingServiceError(Exception):
+    pass
+
+class StaffGradingService(object):
+    """
+    Interface to staff grading backend.
+    """
+    def __init__(self, url):
+        self.url = url
+        # TODO: add auth
+        self.session = requests.session()
+
+    def get_next(course_id):
+        """
+        Get the next thing to grade.  Returns json, or raises GradingServiceError
+        if there's a problem.
+        """
+        try:
+            r = self.session.get(url + 'get_next')
+        except requests.exceptions.ConnectionError as err:
+            # reraise as promised GradingServiceError, but preserve stacktrace.
+            raise GradingServiceError, str(err), sys.exc_info()[2]
+
+        return r.text
+
+
+#@login_required
+def get_next(request, course_id):
+    """
+    """
+    d = {'success': False}
+    return HttpResponse(json.dumps(d))
+
+
+#@login_required
+@expect_json
+def save_grade(request, course_id):
+    """
+
+    """
+    d = {'success': False}
+    return HttpResponse(json.dumps(d))
+
diff --git a/lms/urls.py b/lms/urls.py
index 7c1ccb6bde..0b2def9135 100644
--- a/lms/urls.py
+++ b/lms/urls.py
@@ -232,6 +232,10 @@ if settings.COURSEWARE_ENABLED:
             'instructor.views.enroll_students', name='enroll_students'),
         url(r'^courses/(?P<course_id>[^/]+/[^/]+/[^/]+)/staff_grading$',
             'instructor.views.staff_grading', name='staff_grading'),
+        url(r'^courses/(?P<course_id>[^/]+/[^/]+/[^/]+)/staff_grading/get_next$',
+            'instructor.staff_grading_service.get_next', name='staff_grading_get_next'),
+        url(r'^courses/(?P<course_id>[^/]+/[^/]+/[^/]+)/staff_grading/save_grade$',
+            'instructor.staff_grading_service.save_grade', name='staff_grading_save_grade'),
     )
 
     # discussion forums live within courseware, so courseware must be enabled first