add new peer grading service with some rudimentary logic

lms/djangoapps/open_ended_grading/peer_grading_service.py

@@ -6,6 +6,8 @@ import sys
 
 from django.conf import settings
 from django.http import HttpResponse, Http404
+from grading_service import GradingService
+from grading_service import GradingServiceError
 
 from courseware.access import has_access
 from util.json_request import expect_json
@@ -13,3 +15,26 @@ from xmodule.course_module import CourseDescriptor
 
 log = logging.getLogger(__name__)
 
+class PeerGradingService(GradingService):
+    """
+    Interface with the grading controller for peer grading
+    """
+    def __init__(self, config):
+        super(PeerGradingService, self).__init__(config)
+        self.get_next_submission_url = self.url + '/get_next_submission/'
+        self.save_grade_url = self.url + '/save_grade/'
+        self.is_student_calibrated_url = self.url + '/is_student_calibrated/'
+        self.show_calibration_essay = self.url + '/show_calibration_essay/'
+        self.save_calibration_essay = self.url + '/save_calibration_essay/'
+
+    def get_next_submission(self, problem_location, grader_id):
+        return self.get(self.get_next_submission_url, False, 
+                {'location': problem_location, 'grader_id': grader_id})
+
+    def save_grade(self, grader_id, submission_id, score, feedback, submission_key):
+        data = {'grader_id' : grader_id,
+                'submission_id' : submission_id,
+                'score' : score,
+                'feedback' : feedback,
+                'submission_key', submission_key}
+        return self.post(self.save_grade_url, False, data)