From 6d11ee612192a4173fb3717ef656ee8fa870fe7e Mon Sep 17 00:00:00 2001
From: Bianca Severino <biancasev@gmail.com>
Date: Wed, 3 Mar 2021 14:35:16 -0500
Subject: [PATCH] Add more detail and consistency to log messages

---
 CHANGELOG.rst                                 |   5 +
 edx_proctoring/__init__.py                    |   2 +-
 edx_proctoring/api.py                         | 332 +++++++++++-------
 edx_proctoring/backends/rest.py               |  21 +-
 edx_proctoring/backends/software_secure.py    |   6 +-
 edx_proctoring/backends/tests/test_backend.py |   2 +-
 edx_proctoring/callbacks.py                   |   6 +-
 edx_proctoring/exceptions.py                  |   3 -
 edx_proctoring/models.py                      |   6 +-
 edx_proctoring/signals.py                     |   6 +-
 edx_proctoring/tests/test_reviews.py          |   4 +-
 edx_proctoring/tests/test_signals.py          |  47 +++
 edx_proctoring/tests/test_views.py            |  21 +-
 edx_proctoring/utils.py                       |   2 +-
 edx_proctoring/views.py                       | 128 ++++---
 package.json                                  |   2 +-
 16 files changed, 379 insertions(+), 214 deletions(-)
 create mode 100644 edx_proctoring/tests/test_signals.py

diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 5df69bec1e4..52b90e4fd17 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -13,6 +13,11 @@ Change Log
 
 Unreleased
 ~~~~~~~~~~
+
+[3.7.5] - 2021-03-05
+~~~~~~~~~~~~~~~~~~~~
+* Add more useful attributes to log messages, in a key=value format that is easier to extract, and reduce
+  duplicate exception logs.
 * Update private.txt file path in developer docs
 
 [3.7.4] - 2021-03-03
diff --git a/edx_proctoring/__init__.py b/edx_proctoring/__init__.py
index 9695438097a..8ce693bffa8 100644
--- a/edx_proctoring/__init__.py
+++ b/edx_proctoring/__init__.py
@@ -3,6 +3,6 @@
 """
 
 # Be sure to update the version number in edx_proctoring/package.json
-__version__ = '3.7.4'
+__version__ = '3.7.5'
 
 default_app_config = 'edx_proctoring.apps.EdxProctoringConfig'  # pylint: disable=invalid-name
diff --git a/edx_proctoring/api.py b/edx_proctoring/api.py
index 262f4d5ba7a..b4905729fbf 100644
--- a/edx_proctoring/api.py
+++ b/edx_proctoring/api.py
@@ -86,7 +86,11 @@ def create_exam(course_id, content_id, exam_name, time_limit_mins, due_date=None
     """
 
     if ProctoredExam.get_exam_by_content_id(course_id, content_id) is not None:
-        raise ProctoredExamAlreadyExists
+        err_msg = (
+            'Attempted to create proctored exam with course_id={course_id} and content_id={content_id}, '
+            'but this exam already exists.'.format(course_id=course_id, content_id=content_id)
+        )
+        raise ProctoredExamAlreadyExists(err_msg)
 
     proctored_exam = ProctoredExam.objects.create(
         course_id=course_id,
@@ -103,10 +107,10 @@ def create_exam(course_id, content_id, exam_name, time_limit_mins, due_date=None
     )
 
     log_msg = (
-        u'Created exam ({exam_id}) with parameters: course_id={course_id}, '
-        u'content_id={content_id}, exam_name={exam_name}, time_limit_mins={time_limit_mins}, '
-        u'is_proctored={is_proctored}, is_practice_exam={is_practice_exam}, '
-        u'external_id={external_id}, is_active={is_active}, hide_after_due={hide_after_due}'.format(
+        'Created exam (exam_id={exam_id}) with parameters: course_id={course_id}, '
+        'content_id={content_id}, exam_name={exam_name}, time_limit_mins={time_limit_mins}, '
+        'is_proctored={is_proctored}, is_practice_exam={is_practice_exam}, '
+        'external_id={external_id}, is_active={is_active}, hide_after_due={hide_after_due}'.format(
             exam_id=proctored_exam.id,
             course_id=course_id, content_id=content_id,
             exam_name=exam_name, time_limit_mins=time_limit_mins,
@@ -136,7 +140,14 @@ def create_exam_review_policy(exam_id, set_by_user_id, review_policy):
     """
     exam_review_policy = ProctoredExamReviewPolicy.get_review_policy_for_exam(exam_id)
     if exam_review_policy is not None:
-        raise ProctoredExamReviewPolicyAlreadyExists
+        err_msg = (
+            'user_id={user_id} attempted to create an exam review policy for '
+            'exam_id={exam_id}, but a review policy for this exam already exists.'.format(
+                user_id=set_by_user_id,
+                exam_id=exam_id,
+            )
+        )
+        raise ProctoredExamReviewPolicyAlreadyExists(err_msg)
 
     exam_review_policy = ProctoredExamReviewPolicy.objects.create(
         proctored_exam_id=exam_id,
@@ -145,8 +156,8 @@ def create_exam_review_policy(exam_id, set_by_user_id, review_policy):
     )
 
     log_msg = (
-        u'Created ProctoredExamReviewPolicy ({review_policy}) with parameters: exam_id={exam_id}, '
-        u'set_by_user_id={set_by_user_id}'.format(
+        'Created ProctoredExamReviewPolicy (review_policy={review_policy}) '
+        'with parameters: exam_id={exam_id}, set_by_user_id={set_by_user_id}'.format(
             exam_id=exam_id,
             review_policy=review_policy,
             set_by_user_id=set_by_user_id,
@@ -169,8 +180,8 @@ def update_review_policy(exam_id, set_by_user_id, review_policy):
     Returns: review_policy_id
     """
     log_msg = (
-        u'Updating exam review policy with exam_id {exam_id} '
-        u'set_by_user_id={set_by_user_id}, review_policy={review_policy} '
+        'Updating exam review policy with exam_id={exam_id} '
+        'set_by_user_id={set_by_user_id}, review_policy={review_policy} '
         .format(
             exam_id=exam_id, set_by_user_id=set_by_user_id, review_policy=review_policy
         )
@@ -178,17 +189,34 @@ def update_review_policy(exam_id, set_by_user_id, review_policy):
     log.info(log_msg)
     exam_review_policy = ProctoredExamReviewPolicy.get_review_policy_for_exam(exam_id)
     if exam_review_policy is None:
-        raise ProctoredExamReviewPolicyNotFoundException
+        err_msg = (
+            'user_id={user_id} attempted to update exam review policy for '
+            'exam_id={exam_id}, but this exam does not have a review policy.'.format(
+                user_id=set_by_user_id,
+                exam_id=exam_id,
+            )
+        )
+        raise ProctoredExamReviewPolicyNotFoundException(err_msg)
 
     if review_policy:
         exam_review_policy.set_by_user_id = set_by_user_id
         exam_review_policy.review_policy = review_policy
         exam_review_policy.save()
-        msg = u'Updated exam review policy with {exam_id}'.format(exam_id=exam_id)
+        msg = (
+            'Updated exam review policy for exam_id={exam_id}, set_by_user_id={set_by_user_id}'.format(
+                set_by_user_id=set_by_user_id,
+                exam_id=exam_id,
+            )
+        )
         log.info(msg)
     else:
         exam_review_policy.delete()
-        msg = u'removed exam review policy with {exam_id}'.format(exam_id=exam_id)
+        msg = (
+            'Removed exam review policy for exam_id={exam_id}, set_by_user_id={set_by_user_id}'.format(
+                set_by_user_id=set_by_user_id,
+                exam_id=exam_id,
+            )
+        )
         log.info(msg)
 
 
@@ -197,14 +225,15 @@ def remove_review_policy(exam_id):
     Given a exam id, remove the existing record, otherwise raise exception if not found.
     """
 
-    log_msg = (
-        u'removing exam review policy with exam_id {exam_id}'
-        .format(exam_id=exam_id)
-    )
+    log_msg = 'Removing exam review policy for exam_id={exam_id}'.format(exam_id=exam_id)
     log.info(log_msg)
     exam_review_policy = ProctoredExamReviewPolicy.get_review_policy_for_exam(exam_id)
     if exam_review_policy is None:
-        raise ProctoredExamReviewPolicyNotFoundException
+        err_msg = (
+            'Attempted to remove exam remove policy for exam_id={exam_id}, but this '
+            'exam does not have a review policy.'.format(exam_id=exam_id)
+        )
+        raise ProctoredExamReviewPolicyNotFoundException(err_msg)
 
     exam_review_policy.delete()
 
@@ -226,7 +255,11 @@ def get_review_policy_by_exam_id(exam_id):
     """
     exam_review_policy = ProctoredExamReviewPolicy.get_review_policy_for_exam(exam_id)
     if exam_review_policy is None:
-        raise ProctoredExamReviewPolicyNotFoundException
+        err_msg = (
+            'Attempted to get exam review policy for exam_id={exam_id}, but this review '
+            'policy does not exist.'.format(exam_id=exam_id)
+        )
+        raise ProctoredExamReviewPolicyNotFoundException(err_msg)
 
     return ProctoredExamReviewPolicySerializer(exam_review_policy).data
 
@@ -255,11 +288,11 @@ def update_exam(exam_id, exam_name=None, time_limit_mins=None, due_date=constant
     """
 
     log_msg = (
-        u'Updating exam_id {exam_id} with parameters '
-        u'exam_name={exam_name}, time_limit_mins={time_limit_mins}, due_date={due_date}'
-        u'is_proctored={is_proctored}, is_practice_exam={is_practice_exam}, '
-        u'external_id={external_id}, is_active={is_active}, hide_after_due={hide_after_due}, '
-        u'backend={backend}'.format(
+        'Updating exam_id={exam_id} with parameters '
+        'exam_name={exam_name}, time_limit_mins={time_limit_mins}, due_date={due_date}'
+        'is_proctored={is_proctored}, is_practice_exam={is_practice_exam}, '
+        'external_id={external_id}, is_active={is_active}, hide_after_due={hide_after_due}, '
+        'backend={backend}'.format(
             exam_id=exam_id, exam_name=exam_name, time_limit_mins=time_limit_mins,
             due_date=due_date, is_proctored=is_proctored, is_practice_exam=is_practice_exam,
             external_id=external_id, is_active=is_active, hide_after_due=hide_after_due, backend=backend
@@ -269,7 +302,10 @@ def update_exam(exam_id, exam_name=None, time_limit_mins=None, due_date=constant
 
     proctored_exam = ProctoredExam.get_exam_by_id(exam_id)
     if proctored_exam is None:
-        raise ProctoredExamNotFoundException
+        err_msg = (
+            'Attempted to update exam_id={exam_id}, but this exam does not exist.'.format(exam_id=exam_id)
+        )
+        raise ProctoredExamNotFoundException(err_msg)
 
     if exam_name is not None:
         proctored_exam.exam_name = exam_name
@@ -316,7 +352,10 @@ def get_exam_by_id(exam_id):
     """
     proctored_exam = ProctoredExam.get_exam_by_id(exam_id)
     if proctored_exam is None:
-        raise ProctoredExamNotFoundException
+        err_msg = (
+            'Attempted to get exam_id={exam_id}, but this exam does not exist.'.format(exam_id=exam_id)
+        )
+        raise ProctoredExamNotFoundException(err_msg)
 
     serialized_exam_object = ProctoredExamSerializer(proctored_exam)
     return serialized_exam_object.data
@@ -340,11 +379,12 @@ def get_exam_by_content_id(course_id, content_id):
     """
     proctored_exam = ProctoredExam.get_exam_by_content_id(course_id, content_id)
     if proctored_exam is None:
-        log.exception(
-            u'Cannot find the proctored exam in this course %s with content_id: %s',
-            course_id, content_id
+        err_msg = (
+            'Cannot find proctored exam in course_id={course_id} with content_id={content_id}'.format(
+                course_id=course_id, content_id=content_id
+            )
         )
-        raise ProctoredExamNotFoundException
+        raise ProctoredExamNotFoundException(err_msg)
 
     serialized_exam_object = ProctoredExamSerializer(proctored_exam)
     return serialized_exam_object.data
@@ -356,8 +396,8 @@ def add_allowance_for_user(exam_id, user_info, key, value):
     """
 
     log_msg = (
-        u'Adding allowance "{key}" with value "{value}" for exam_id {exam_id} '
-        u'for user {user_info} '.format(
+        'Adding allowance key={key} with value={value} for exam_id={exam_id} '
+        'for user={user_info} '.format(
             key=key, value=value, exam_id=exam_id, user_info=user_info
         )
     )
@@ -396,7 +436,7 @@ def remove_allowance_for_user(exam_id, user_id, key):
     Deletes an allowance for a user within a given exam.
     """
     log_msg = (
-        u'Removing allowance "{key}" for exam_id {exam_id} for user_id {user_id} '.format(
+        'Removing allowance key={key} for exam_id={exam_id} for user_id={user_id}'.format(
             key=key, exam_id=exam_id, user_id=user_id
         )
     )
@@ -516,10 +556,8 @@ def update_exam_attempt(attempt_id, **kwargs):
     exam_attempt_obj = ProctoredExamStudentAttempt.objects.get_exam_attempt_by_id(attempt_id)
     if not exam_attempt_obj:
         err_msg = (
-            u'Attempted to access of attempt object with attempt_id {attempt_id} but '
-            'it does not exist.'.format(
-                attempt_id=attempt_id
-            )
+            'Attempted to update exam attempt with attempt_id={attempt_id} but '
+            'this attempt does not exist.'.format(attempt_id=attempt_id)
         )
         raise StudentExamAttemptDoesNotExistsException(err_msg)
 
@@ -533,8 +571,8 @@ def update_exam_attempt(attempt_id, **kwargs):
                 'time_remaining_seconds',
         ]:
             err_msg = (
-                u'You cannot call into update_exam_attempt to change '
-                u'field {key}'.format(key=key)
+                'You cannot call into update_exam_attempt to change '
+                'field={key}. (attempt_id={attempt_id})'.format(key=key, attempt_id=attempt_id)
             )
             raise ProctoredExamPermissionDenied(err_msg)
         setattr(exam_attempt_obj, key, value)
@@ -629,13 +667,14 @@ def _register_proctored_exam_attempt(user_id, exam_id, exam, attempt_code, revie
         )
     except BackendProviderSentNoAttemptID as ex:
         log_message = (
-            u'Failed to get the attempt ID for {user_id}'
-            u'in {exam_id} from the backend because the backend'
-            u'did not provide the id in API response, even when the'
-            u'HTTP response status is {status}, '
-            u'Response: {response}'.format(
+            'Failed to get the attempt ID for user_id={user_id} '
+            'for exam_id={exam_id} in course_id={course_id} from the '
+            'backend because the backend did not provide the id in API '
+            'response, even when the HTTP response status is {status}, '
+            'Response: {response}'.format(
                 user_id=user_id,
                 exam_id=exam_id,
+                course_id=exam['course_id'],
                 response=str(ex),
                 status=ex.http_status
             )
@@ -644,12 +683,13 @@ def _register_proctored_exam_attempt(user_id, exam_id, exam, attempt_code, revie
         raise ex
     except BackendProviderCannotRegisterAttempt as ex:
         log_message = (
-            u'Failed to create attempt for {user_id} '
-            u'in {exam_id} because backend was unable '
-            u'to register the attempt. Status: {status}, '
-            u'Reponse: {response}'.format(
+            'Failed to create attempt for user_id={user_id} '
+            'for exam_id={exam_id} in course_id={course_id} '
+            'because backend was unable to register the attempt. '
+            'Status: {status}, Response: {response}'.format(
                 user_id=user_id,
                 exam_id=exam_id,
+                course_id=exam['course_id'],
                 response=str(ex),
                 status=ex.http_status,
             )
@@ -659,9 +699,14 @@ def _register_proctored_exam_attempt(user_id, exam_id, exam, attempt_code, revie
     except BackendProviderOnboardingException as ex:
         force_status = ex.status
         log_msg = (
-            u'Failed to create attempt for {user_id} '
-            u'in {exam_id} because of onboarding failure: '
-            u'{force_status}'.format(**locals())
+            'Failed to create attempt for user_id={user_id} '
+            'for exam_id={exam_id} in course_id={course_id} '
+            'because of onboarding failure: {force_status}'.format(
+                user_id=user_id,
+                exam_id=exam_id,
+                course_id=exam['course_id'],
+                force_status=force_status
+            )
         )
         log.error(log_msg)
 
@@ -680,15 +725,19 @@ def create_exam_attempt(exam_id, user_id, taking_as_proctored=False):
     """
     # for now the student is allowed the exam default
 
+    exam = get_exam_by_id(exam_id)
+
     log_msg = (
-        u'Creating exam attempt for exam_id {exam_id} for '
-        u'user_id {user_id} with taking as proctored = {taking_as_proctored}'.format(
-            exam_id=exam_id, user_id=user_id, taking_as_proctored=taking_as_proctored
+        'Creating exam attempt for exam_id={exam_id} for user_id={user_id} '
+        'in course_id={course_id} with taking_as_proctored={taking_as_proctored}'.format(
+            exam_id=exam_id,
+            user_id=user_id,
+            course_id=exam['course_id'],
+            taking_as_proctored=taking_as_proctored,
         )
     )
     log.info(log_msg)
 
-    exam = get_exam_by_id(exam_id)
     existing_attempt = ProctoredExamStudentAttempt.objects.get_current_exam_attempt(exam_id, user_id)
     time_remaining_seconds = None
     # only practice exams and exams with resume states may have multiple attempts
@@ -699,9 +748,9 @@ def create_exam_attempt(exam_id, user_id, taking_as_proctored=False):
             mark_exam_attempt_as_resumed(existing_attempt.id)
         elif not existing_attempt.is_sample_attempt:
             err_msg = (
-                'Cannot create new exam attempt for exam_id = {exam_id} and '
-                'user_id = {user_id} because it already exists!'
-            ).format(exam_id=exam_id, user_id=user_id)
+                'Cannot create new exam attempt for exam_id={exam_id} and '
+                'user_id={user_id} in course_id={course_id} because it already exists!'
+            ).format(exam_id=exam_id, user_id=user_id, course_id=exam['course_id'])
 
             raise StudentExamAttemptAlreadyExistsException(err_msg)
 
@@ -712,14 +761,13 @@ def create_exam_attempt(exam_id, user_id, taking_as_proctored=False):
     force_status = None
 
     if is_exam_passed_due(exam, user=user_id) and taking_as_proctored:
-        log_msg = (
-            u'user_id {user_id} trying to create exam atttempt for past due proctored exam {exam_id} '
-            u'Do not register an exam attempt! Return None'.format(
-                exam_id=exam_id, user_id=user_id
+        err_msg = (
+            'user_id={user_id} trying to create exam attempt for past due proctored '
+            'exam_id={exam_id} in course_id={course_id}. Do not register an exam attempt!'.format(
+                exam_id=exam_id, user_id=user_id, course_id=exam['course_id']
             )
         )
-        log.error(log_msg)
-        raise StudentExamAttemptOnPastDueProctoredExam
+        raise StudentExamAttemptOnPastDueProctoredExam(err_msg)
 
     if taking_as_proctored:
         external_id, force_status = _register_proctored_exam_attempt(
@@ -743,10 +791,10 @@ def create_exam_attempt(exam_id, user_id, taking_as_proctored=False):
     emit_event(exam, attempt.status, attempt=_get_exam_attempt(attempt))
 
     log_msg = (
-        u'Created exam attempt ({attempt_id}) for exam_id {exam_id} for '
-        u'user_id {user_id} with taking as proctored = {taking_as_proctored} '
-        u'Attempt_code {attempt_code} was generated which has a '
-        u'external_id of {external_id}'.format(
+        'Created exam attempt_id={attempt_id} for exam_id={exam_id} for '
+        'user_id={user_id} with taking as proctored={taking_as_proctored}. '
+        'attempt_code={attempt_code} was generated which has an '
+        'external_id={external_id}'.format(
             attempt_id=attempt.id, exam_id=exam_id, user_id=user_id,
             taking_as_proctored=taking_as_proctored,
             attempt_code=attempt_code,
@@ -770,8 +818,8 @@ def start_exam_attempt(exam_id, user_id):
 
     if not existing_attempt:
         err_msg = (
-            u'Cannot start exam attempt for exam_id = {exam_id} '
-            u'and user_id = {user_id} because it does not exist!'
+            'Cannot start exam attempt for exam_id={exam_id} '
+            'and user_id={user_id} because it does not exist!'
         ).format(exam_id=exam_id, user_id=user_id)
 
         raise StudentExamAttemptDoesNotExistsException(err_msg)
@@ -789,8 +837,8 @@ def start_exam_attempt_by_code(attempt_code):
 
     if not existing_attempt:
         err_msg = (
-            u'Cannot start exam attempt for attempt_code = {attempt_code} '
-            u'because it does not exist!'
+            'Cannot start exam attempt for attempt_code={attempt_code} '
+            'because it does not exist!'
         ).format(attempt_code=attempt_code)
 
         raise StudentExamAttemptDoesNotExistsException(err_msg)
@@ -806,8 +854,8 @@ def _start_exam_attempt(existing_attempt):
     if existing_attempt.started_at and existing_attempt.status == ProctoredExamStudentAttemptStatus.started:
         # cannot restart an attempt
         err_msg = (
-            u'Cannot start exam attempt for exam_id = {exam_id} '
-            u'and user_id = {user_id} because it has already started!'
+            'Cannot start exam attempt for exam_id={exam_id} '
+            'and user_id={user_id} because it has already started!'
         ).format(exam_id=existing_attempt.proctored_exam.id, user_id=existing_attempt.user_id)
 
         raise StudentExamAttemptedAlreadyStarted(err_msg)
@@ -929,7 +977,10 @@ def update_attempt_status(attempt_id, to_status,
 
     if exam_attempt_obj is None:
         if raise_if_not_found:
-            raise StudentExamAttemptDoesNotExistsException('Error. Trying to look up an exam that does not exist.')
+            raise StudentExamAttemptDoesNotExistsException(
+                'Tried to look up exam by attempt_id={attempt_id}, '
+                'but this attempt does not exist.'.format(attempt_id=attempt_id)
+            )
         return
 
     exam_id = exam_attempt_obj.proctored_exam.id
@@ -938,8 +989,8 @@ def update_attempt_status(attempt_id, to_status,
     from_status = exam_attempt_obj.status
 
     log_msg = (
-        u'Updating attempt status for exam_id {exam_id} '
-        u'for user_id {user_id} from status "{from_status}" to "{to_status}"'.format(
+        'Updating attempt status for exam_id={exam_id} '
+        'for user_id={user_id} from status "{from_status}" to "{to_status}"'.format(
             exam_id=exam_id, user_id=user_id, from_status=from_status, to_status=to_status
         )
     )
@@ -958,13 +1009,14 @@ def update_attempt_status(attempt_id, to_status,
 
     if not is_state_transition_legal(from_status, to_status):
         illegal_status_transition_msg = (
-            'A status transition from {from_status} to {to_status} was attempted '
-            'on exam_id {exam_id} for user_id {user_id}. This is not '
-            'allowed!'.format(
+            'A status transition from "{from_status}" to "{to_status}" was attempted '
+            'on exam_id={exam_id} for user_id={user_id}. This is not '
+            'allowed! (course_id={course_id})'.format(
                 from_status=from_status,
                 to_status=to_status,
                 exam_id=exam_id,
-                user_id=user_id
+                user_id=user_id,
+                course_id=exam['course_id']
             )
         )
 
@@ -1012,9 +1064,9 @@ def update_attempt_status(attempt_id, to_status,
                 credit_requirement_status = 'failed'
 
             log_msg = (
-                u'Calling set_credit_requirement_status for '
-                u'user_id {user_id} on {course_id} for '
-                u'content_id {content_id}. Status: {status}'.format(
+                'Calling set_credit_requirement_status for '
+                'user_id={user_id} on course_id={course_id} for '
+                'content_id={content_id}. status={status}'.format(
                     user_id=exam_attempt_obj.user_id,
                     course_id=exam['course_id'],
                     content_id=exam_attempt_obj.proctored_exam.content_id,
@@ -1083,11 +1135,11 @@ def update_attempt_status(attempt_id, to_status,
 
             if grades_service.should_override_grade_on_rejected_exam(exam['course_id']):
                 log_msg = (
-                    u'Overriding exam subsection grade for '
-                    u'user_id {user_id} on {course_id} for '
-                    u'content_id {content_id}. Override '
-                    u'earned_all: {earned_all}, '
-                    u'earned_graded: {earned_graded}.'.format(
+                    'Overriding exam subsection grade for '
+                    'user_id={user_id} on course_id={course_id} for '
+                    'content_id={content_id}. Override '
+                    'earned_all={earned_all}, '
+                    'earned_graded={earned_graded}.'.format(
                         user_id=exam_attempt_obj.user_id,
                         course_id=exam['course_id'],
                         content_id=exam_attempt_obj.proctored_exam.content_id,
@@ -1112,8 +1164,8 @@ def update_attempt_status(attempt_id, to_status,
                 certificates_service = get_runtime_service('certificates')
 
                 log.info(
-                    u'Invalidating certificate for user_id {user_id} in course {course_id} whose '
-                    u'grade dropped below passing threshold due to suspicious proctored exam'.format(
+                    'Invalidating certificate for user_id={user_id} in course_id={course_id} whose '
+                    'grade dropped below passing threshold due to suspicious proctored exam'.format(
                         user_id=exam_attempt_obj.user_id,
                         course_id=exam['course_id']
                     )
@@ -1131,11 +1183,11 @@ def update_attempt_status(attempt_id, to_status,
 
             if grades_service.should_override_grade_on_rejected_exam(exam['course_id']):
                 log_msg = (
-                    u'Deleting override of exam subsection grade for '
-                    u'user_id {user_id} on {course_id} for '
-                    u'content_id {content_id}. Override '
-                    u'earned_all: {earned_all}, '
-                    u'earned_graded: {earned_graded}.'.format(
+                    'Deleting override of exam subsection grade for '
+                    'user_id={user_id} on course_id={course_id} for '
+                    'content_id={content_id}. Override '
+                    'earned_all={earned_all}, '
+                    'earned_graded={earned_graded}.'.format(
                         user_id=exam_attempt_obj.user_id,
                         course_id=exam['course_id'],
                         content_id=exam_attempt_obj.proctored_exam.content_id,
@@ -1165,9 +1217,11 @@ def update_attempt_status(attempt_id, to_status,
         else:
             course_name = default_name
             log.info(
-                u"Could not find credit_state for user id %r in the course %r.",
-                exam_attempt_obj.user_id,
-                exam_attempt_obj.proctored_exam.course_id
+                'While updating attempt status, could not find credit_state for '
+                'user_id={user_id} in course_id={course_id}'.format(
+                    user_id=exam_attempt_obj.user_id,
+                    course_id=exam_attempt_obj.proctored_exam.course_id,
+                )
             )
         email = create_proctoring_attempt_status_email(
             user_id,
@@ -1211,7 +1265,7 @@ def update_attempt_status(attempt_id, to_status,
     return attempt['id']
 
 
-def create_proctoring_attempt_status_email(user_id, exam_attempt_obj, course_name, course_key):
+def create_proctoring_attempt_status_email(user_id, exam_attempt_obj, course_name, course_id):
     """
     Creates an email about change in proctoring attempt status.
     """
@@ -1249,7 +1303,14 @@ def create_proctoring_attempt_status_email(user_id, exam_attempt_obj, course_nam
     try:
         course_info_url = reverse('info', args=[exam_attempt_obj.proctored_exam.course_id])
     except NoReverseMatch:
-        log.exception(u"Can't find course info url for course %s", exam_attempt_obj.proctored_exam.course_id)
+        log.exception(
+            'Attempted to create proctoring status email for user_id={user_id} in exam_id={exam_id}, '
+            'but could not find course info url for course_id={course_id}'.format(
+                user_id=user_id,
+                exam_id=exam_attempt_obj.proctored_exam.id,
+                course_id=course_id,
+            )
+        )
 
     scheme = 'https' if getattr(settings, 'HTTPS', 'on') == 'on' else 'http'
     course_url = '{scheme}://{site_name}{course_info_url}'.format(
@@ -1275,10 +1336,16 @@ def create_proctoring_attempt_status_email(user_id, exam_attempt_obj, course_nam
     instructor_service = get_runtime_service('instructor')
     if instructor_service:
         try:
-            proctoring_escalation_email = instructor_service.get_proctoring_escalation_email(course_key)
+            proctoring_escalation_email = instructor_service.get_proctoring_escalation_email(course_id)
         except (InvalidKeyError, ObjectDoesNotExist):
             log.warning(
-                'Could not retrieve proctoring escalation email with course key: {}'.format(course_key)
+                'While creating proctoring status email for user_id={user_id} in exam_id={exam_id}, '
+                'could not retrieve proctoring escalation email with course_id={course_id}. Using '
+                'default contact URL.'.format(
+                    user_id=user_id,
+                    exam_id=exam_attempt_obj.proctored_exam.id,
+                    course_id=course_id,
+                )
             )
 
     if proctoring_escalation_email:
@@ -1336,7 +1403,7 @@ def reset_practice_exam(exam_id, user_id, requesting_user):
     Resets a completed practice exam attempt back to the created state.
     """
     log_msg = (
-        'Resetting practice exam {exam_id} for user {user_id}'.format(
+        'Resetting practice exam_id={exam_id} for user_id={user_id}'.format(
             exam_id=exam_id,
             user_id=user_id,
         )
@@ -1345,31 +1412,35 @@ def reset_practice_exam(exam_id, user_id, requesting_user):
 
     exam_attempt_obj = ProctoredExamStudentAttempt.objects.get_current_exam_attempt(exam_id, user_id)
     if exam_attempt_obj is None:
-        raise StudentExamAttemptDoesNotExistsException('Error. Trying to look up an exam that does not exist.')
+        err_msg = (
+            'Tried to reset attempt in exam_id={exam_id} for user_id={user_id}, '
+            'but this attempt does not exist.'.format(exam_id=exam_id, user_id=user_id)
+        )
+        raise StudentExamAttemptDoesNotExistsException(err_msg)
 
     exam = get_exam_by_id(exam_id)
     if not exam['is_practice_exam']:
-        msg = (
-            'Failed to reset attempt status on exam_id {exam_id} for user_id {user_id}. '
-            'Only practice exams may be reset!'.format(
-                exam_id=exam_id,
-                user_id=user_id,
+        err_msg = (
+            'Failed to reset attempt status on exam_id={exam_id} for user_id={user_id}. '
+            'Only practice exams may be reset! (course_id={course_id})'.format(
+                exam_id=exam_id, user_id=user_id, course_id=exam['course_id']
             )
         )
-        raise ProctoredExamIllegalStatusTransition(msg)
+        raise ProctoredExamIllegalStatusTransition(err_msg)
 
     # prevent a reset if the exam is currently in progress or has already been verified
     attempt_in_progress = ProctoredExamStudentAttemptStatus.is_incomplete_status(exam_attempt_obj.status)
     if attempt_in_progress or exam_attempt_obj.status == ProctoredExamStudentAttemptStatus.verified:
-        msg = (
-            'Failed to reset attempt status on exam_id {exam_id} for user_id {user_id}. '
-            'Attempt with status {status} cannot be reset!'.format(
+        err_msg = (
+            'Failed to reset attempt status on exam_id={exam_id} for user_id={user_id}. '
+            'Attempt with status={status} cannot be reset! (course_id={course_id})'.format(
                 exam_id=exam_id,
                 user_id=user_id,
                 status=exam_attempt_obj.status,
+                course_id=exam['course_id'],
             )
         )
-        raise ProctoredExamIllegalStatusTransition(msg)
+        raise ProctoredExamIllegalStatusTransition(err_msg)
 
     # resetting a submitted attempt that has not been reviewed will entirely remove that submission.
     if exam_attempt_obj.status == ProctoredExamStudentAttemptStatus.submitted:
@@ -1389,15 +1460,14 @@ def remove_exam_attempt(attempt_id, requesting_user):
     """
 
     log_msg = (
-        u'Removing exam attempt {attempt_id}'.format(attempt_id=attempt_id)
+        'Removing exam attempt_id={attempt_id}'.format(attempt_id=attempt_id)
     )
     log.info(log_msg)
 
     existing_attempt = ProctoredExamStudentAttempt.objects.get_exam_attempt_by_id(attempt_id)
     if not existing_attempt:
         err_msg = (
-            u'Cannot remove attempt for attempt_id = {attempt_id} '
-            u'because it does not exist!'
+            'Cannot remove attempt for attempt_id={attempt_id} because it does not exist!'
         ).format(attempt_id=attempt_id)
 
         raise StudentExamAttemptDoesNotExistsException(err_msg)
@@ -1679,10 +1749,7 @@ def _resolve_prerequisite_links(exam, prerequisites):
     for prerequisite in prerequisites:
         jumpto_url = None
         if prerequisite['namespace'] in JUMPTO_SUPPORTED_NAMESPACES and prerequisite['name']:
-            try:
-                jumpto_url = reverse('jump_to', args=[exam['course_id'], prerequisite['name']])
-            except NoReverseMatch:
-                log.exception(u"Can't find jumpto url for course %s", exam['course_id'])
+            jumpto_url = reverse('jump_to', args=[exam['course_id'], prerequisite['name']])
 
         prerequisite['jumpto_url'] = jumpto_url
 
@@ -1790,8 +1857,10 @@ def get_attempt_status_summary(user_id, course_id, content_id):
     except ProctoredExamNotFoundException:
         # this really shouldn't happen, but log it at least
         log.exception(
-            u'Cannot find the proctored exam in this course %s with content_id: %s',
-            course_id, content_id
+            'Requested attempt status summary for user_id={user_id}, but could not find exam '
+            'in course_id={course_id} with content_id={content_id}'.format(
+                user_id=user_id, course_id=course_id, content_id=content_id
+            )
         )
         return None
 
@@ -1962,7 +2031,7 @@ def _get_timed_exam_view(exam, context, exam_id, user_id, course_id):
         try:
             progress_page_url = reverse('progress', args=[course_id])
         except NoReverseMatch:
-            log.exception(u"Can't find progress url for course %s", course_id)
+            log.exception("Can't find progress url for course_id={course_id}".format(course_id=course_id))
 
         context.update({
             'total_time': total_time,
@@ -2040,7 +2109,7 @@ def _get_proctored_exam_context(exam, attempt, user_id, course_id, is_practice_e
     try:
         progress_page_url = reverse('progress', args=[course_id])
     except NoReverseMatch:
-        log.exception(u"Can't find progress url for course %s", course_id)
+        log.exception("Can't find progress url for course_id={course_id}".format(course_id=course_id))
 
     provider = get_backend_provider(exam)
 
@@ -2333,10 +2402,7 @@ def _get_proctored_exam_view(exam, context, exam_id, user_id, course_id):
         onboarding_exam = ProctoredExam.objects.filter(course_id=course_id,
                                                        is_active=True,
                                                        is_practice_exam=True).first()
-        try:
-            context['onboarding_link'] = reverse('jump_to', args=[course_id, onboarding_exam.content_id])
-        except (NoReverseMatch, AttributeError):
-            log.exception(u"Can't find onboarding exam for %s", course_id)
+        context['onboarding_link'] = reverse('jump_to', args=[course_id, onboarding_exam.content_id])
     elif attempt_status == ProctoredExamStudentAttemptStatus.ready_to_resume:
         student_view_template = 'proctored_exam/ready_to_resume.html'
 
@@ -2485,7 +2551,7 @@ def does_backend_support_onboarding(backend):
         return get_backend_provider(name=backend).supports_onboarding
     except NotImplementedError:
         log.exception(
-            u"No proctoring backend configured for '{}'.".format(backend)
+            'No proctoring backend configured for backend={backend}'.format(backend=backend)
         )
         return False
 
@@ -2499,8 +2565,8 @@ def get_exam_configuration_dashboard_url(course_id, content_id):
         exam = get_exam_by_content_id(course_id, content_id)
     except ProctoredExamNotFoundException:
         log.exception(
-            u'Cannot find the proctored exam in this course %s with content_id: %s',
-            course_id, content_id
+            'Cannot find the proctored exam in course_id={course_id} with '
+            'content_id={content_id}'.format(course_id=course_id, content_id=content_id)
         )
         return None
 
diff --git a/edx_proctoring/backends/rest.py b/edx_proctoring/backends/rest.py
index 014c8244c32..4e8d1c8f092 100644
--- a/edx_proctoring/backends/rest.py
+++ b/edx_proctoring/backends/rest.py
@@ -184,7 +184,11 @@ def register_exam_attempt(self, exam, context):
         payload['status'] = 'created'
         # attempt code isn't needed in this API
         payload.pop('attempt_code', False)
-        log.debug(u'Creating exam attempt for %r at %r', exam['external_id'], url)
+        log.debug(
+            'Creating exam attempt for exam_id={exam_id} (external_id={external_id}) at {url}'.format(
+                exam_id=exam['id'], external_id=exam['external_id'], url=url
+            )
+        )
         response = self.session.post(url, json=payload)
         if response.status_code != 200:
             raise BackendProviderCannotRegisterAttempt(response.content, response.status_code)
@@ -264,7 +268,7 @@ def on_exam_saved(self, exam):
             url = self.exam_url.format(exam_id=external_id)
         else:
             url = self.create_exam_url
-        log.info(u'Saving exam to %r', url)
+        log.info('Saving exam_id={exam_id} to {url}'.format(exam_id=exam['id'], url=url))
         response = None
         try:
             response = self.session.post(url, json=exam)
@@ -275,7 +279,11 @@ def on_exam_saved(self, exam):
                 content = exc.response.content if hasattr(exc, 'response') else response.content
             else:
                 content = None
-            log.exception(u'failed to save exam. %r', content)
+            log.exception(
+                'Failed to save exam_id={exam_id} to {url}. Response: {content}'.format(
+                    exam_id=exam['id'], url=url, content=content
+                )
+            )
             data = {}
         return data.get('id')
 
@@ -304,7 +312,12 @@ def get_instructor_url(self, course_id, user, exam_id=None, attempt_id=None, sho
         encoded = jwt.encode(token, self.client_secret).decode('utf-8')
         url = self.instructor_url.format(client_id=self.client_id, jwt=encoded)
 
-        log.debug(u'Created instructor url for %r %r %r', course_id, exam_id, attempt_id)
+        log.debug(
+            'Created instructor url for course_id={course_id} exam_id={exam_id} '
+            'attempt_id={attempt_id}'.format(
+                course_id=course_id, exam_id=exam_id, attempt_id=attempt_id
+            )
+        )
         return url
 
     def retire_user(self, user_id):
diff --git a/edx_proctoring/backends/software_secure.py b/edx_proctoring/backends/software_secure.py
index 66adca23e99..0dc6a080451 100644
--- a/edx_proctoring/backends/software_secure.py
+++ b/edx_proctoring/backends/software_secure.py
@@ -80,8 +80,8 @@ def register_exam_attempt(self, exam, context):
 
         if status not in [200, 201]:
             err_msg = (
-                u'Could not register attempt_code = {attempt_code}. '
-                u'HTTP Status code was {status_code} and response was {response}.'.format(
+                'Could not register attempt_code={attempt_code}. '
+                'HTTP Status code was {status_code} and response was {response}.'.format(
                     attempt_code=attempt_code,
                     status_code=status,
                     response=response
@@ -353,7 +353,7 @@ def _sign_doc(self, body_json, method, headers, date):
         message = method_string + headers_str + body_str
 
         log_msg = (
-            u'About to send payload to SoftwareSecure: examCode: {examCode}, courseID: {courseID}'.
+            'About to send payload to SoftwareSecure: examCode={examCode}, courseID={courseID}'.
             format(examCode=body_json.get('examCode'), courseID=body_json.get('orgExtra').get('courseID'))
         )
         log.info(log_msg)
diff --git a/edx_proctoring/backends/tests/test_backend.py b/edx_proctoring/backends/tests/test_backend.py
index bafdf58c749..60021e183ee 100644
--- a/edx_proctoring/backends/tests/test_backend.py
+++ b/edx_proctoring/backends/tests/test_backend.py
@@ -278,7 +278,7 @@ def test_mock_provider_exception(self, _, get_attempt_mock, logger_mock):
 
         self.assertTrue(get_attempt_mock.called)
 
-        log_format_string = (u"BLOCKING ERROR: Can't find course info url for course %s")
+        log_format_string = ("BLOCKING ERROR: Can't find course info url for course_id=%s")
         logger_mock.assert_any_call(log_format_string, '')
 
 
diff --git a/edx_proctoring/callbacks.py b/edx_proctoring/callbacks.py
index a898eb9c7c2..0af621defa3 100644
--- a/edx_proctoring/callbacks.py
+++ b/edx_proctoring/callbacks.py
@@ -26,7 +26,7 @@ def start_exam_callback(request, attempt_code):  # pylint: disable=unused-argume
     """
     attempt = get_exam_attempt_by_code(attempt_code)
     if not attempt:
-        log.warning(u"Attempt code %r cannot be found.", attempt_code)
+        log.warning('attempt_code={attempt_code} cannot be found.'.format(attempt_code=attempt_code))
         return HttpResponse(
             content='You have entered an exam code that is not valid.',
             status=404
@@ -40,7 +40,7 @@ def start_exam_callback(request, attempt_code):  # pylint: disable=unused-argume
     if ProctoredExamStudentAttemptStatus.is_in_progress_status(attempt_status):
         update_attempt_status(attempt['id'], ProctoredExamStudentAttemptStatus.submitted)
     else:
-        log.warning(u"Attempted to enter proctored exam attempt {attempt_id} when status was {attempt_status}"
+        log.warning('Attempted to enter proctored exam attempt_id={attempt_id} when status={attempt_status}'
                     .format(
                         attempt_id=attempt['id'],
                         attempt_status=attempt_status,
@@ -53,7 +53,7 @@ def start_exam_callback(request, attempt_code):  # pylint: disable=unused-argume
     try:
         exam_url = reverse('jump_to', args=[course_id, content_id])
     except NoReverseMatch:
-        log.exception(u"BLOCKING ERROR: Can't find course info url for course %s", course_id)
+        log.exception("BLOCKING ERROR: Can't find course info url for course_id=%s", course_id)
     response = HttpResponseRedirect(exam_url)
     response.set_signed_cookie('exam', attempt['attempt_code'])
     return response
diff --git a/edx_proctoring/exceptions.py b/edx_proctoring/exceptions.py
index 029be2b7448..651fa1e6820 100644
--- a/edx_proctoring/exceptions.py
+++ b/edx_proctoring/exceptions.py
@@ -21,9 +21,6 @@ class ProctoredExamNotFoundException(ProctoredBaseException):
     """
     Raised when a look up fails.
     """
-    def __init__(self, *args):
-        """ Init method of exception """
-        ProctoredBaseException.__init__(self, u'The exam_id does not exist.', *args)
 
 
 class ProctoredExamReviewPolicyNotFoundException(ProctoredBaseException):
diff --git a/edx_proctoring/models.py b/edx_proctoring/models.py
index 69dacc9d2a3..79464976912 100644
--- a/edx_proctoring/models.py
+++ b/edx_proctoring/models.py
@@ -669,7 +669,11 @@ def add_allowance_for_user(cls, exam_id, user_info, key, value):
 
         exam = ProctoredExam.get_exam_by_id(exam_id)
         if exam and not exam.is_active:
-            raise ProctoredExamNotActiveException
+            err_msg = (
+                'Attempted to add an allowance for user_id={user_id} in exam_id={exam_id}, but '
+                'this exam is not active.'.format(user_id=user_id, exam_id=exam_id)
+            )
+            raise ProctoredExamNotActiveException(err_msg)
 
         try:
             student_allowance = cls.objects.get(proctored_exam_id=exam_id, user_id=user_id, key=key)
diff --git a/edx_proctoring/signals.py b/edx_proctoring/signals.py
index 2143d2e40df..3faa32b06ee 100644
--- a/edx_proctoring/signals.py
+++ b/edx_proctoring/signals.py
@@ -118,7 +118,11 @@ def on_attempt_changed(sender, instance, signal, **kwargs):  # pylint: disable=u
         if backend:
             result = backend.remove_exam_attempt(instance.proctored_exam.external_id, instance.external_id)
             if not result:
-                log.error(u'Failed to remove attempt %d from %s', instance.id, backend.verbose_name)
+                log.error(
+                    'Failed to remove attempt_id=%s from backend=%s',
+                    instance.id,
+                    instance.proctored_exam.backend,
+                )
     models.archive_model(models.ProctoredExamStudentAttemptHistory, instance, id='attempt_id')
 
 
diff --git a/edx_proctoring/tests/test_reviews.py b/edx_proctoring/tests/test_reviews.py
index b088f01fae0..0fe53593388 100644
--- a/edx_proctoring/tests/test_reviews.py
+++ b/edx_proctoring/tests/test_reviews.py
@@ -509,8 +509,8 @@ def test_reviewed_by_is_course_or_global_staff(self, logger_mock):
         )
 
         log_format_string = (
-            u'User %(user)s does not have the required permissions '
-            u'to submit a review for attempt_code %(attempt_code)s.'
+            'user=%(user)s does not have the required permissions '
+            'to submit a review for attempt_code=%(attempt_code)s.'
         )
 
         log_format_dictionary = {
diff --git a/edx_proctoring/tests/test_signals.py b/edx_proctoring/tests/test_signals.py
new file mode 100644
index 00000000000..c726b1e6ba3
--- /dev/null
+++ b/edx_proctoring/tests/test_signals.py
@@ -0,0 +1,47 @@
+"""
+Tests for signals.py
+"""
+
+from unittest.mock import patch
+
+from httmock import HTTMock
+
+from django.db.models.signals import pre_delete
+
+from edx_proctoring.models import ProctoredExam, ProctoredExamStudentAttempt
+from edx_proctoring.signals import on_attempt_changed
+
+from .utils import ProctoredExamTestCase
+
+
+class SignalTests(ProctoredExamTestCase):
+    """
+    Tests for signals.py
+    """
+    def setUp(self):
+        super().setUp()
+        self.backend_name = 'software_secure'
+        self.proctored_exam = ProctoredExam.objects.create(
+          course_id='x/y/z', content_id=self.content_id, exam_name=self.exam_name,
+          time_limit_mins=self.default_time_limit, external_id=self.external_id,
+          backend=self.backend_name
+        )
+
+        pre_delete.connect(on_attempt_changed, sender=ProctoredExamStudentAttempt)
+
+    def tearDown(self):
+        super().tearDown()
+        pre_delete.disconnect()
+
+    @patch('logging.Logger.error')
+    def test_backend_fails_to_delete_attempt(self, logger_mock):
+        attempt = ProctoredExamStudentAttempt.objects.create(
+            proctored_exam=self.proctored_exam, user=self.user, attempt_code='12345',
+            external_id='abcde'
+        )
+
+        # If there is no response from the backend, assert that it is logged correctly
+        with HTTMock(None):
+            attempt.delete_exam_attempt()
+            log_format_string = ('Failed to remove attempt_id=%s from backend=%s')
+            logger_mock.assert_any_call(log_format_string, 1, self.backend_name)
diff --git a/edx_proctoring/tests/test_views.py b/edx_proctoring/tests/test_views.py
index fd9793ed8b9..f992df4c7c5 100644
--- a/edx_proctoring/tests/test_views.py
+++ b/edx_proctoring/tests/test_views.py
@@ -281,7 +281,10 @@ def test_update_non_existing_exam(self):
 
         self.assertEqual(response.status_code, 400)
         response_data = json.loads(response.content.decode('utf-8'))
-        self.assertEqual(response_data, {'detail': 'The exam_id does not exist.'})
+        self.assertEqual(
+            response_data['detail'],
+            'Attempted to update exam_id={exam_id}, but this exam does not exist.'.format(exam_id=exam_id),
+        )
 
     def test_get_exam_by_id(self):
         """
@@ -317,7 +320,10 @@ def test_get_exam_by_bad_id(self):
         )
         self.assertEqual(response.status_code, 400)
         response_data = json.loads(response.content.decode('utf-8'))
-        self.assertEqual(response_data['detail'], 'The exam_id does not exist.')
+        self.assertEqual(
+            response_data['detail'],
+            'Attempted to get exam_id=99999, but this exam does not exist.',
+        )
 
     def test_get_exam_by_content_id(self):
         """
@@ -394,7 +400,11 @@ def test_get_exam_by_bad_content_id(self):
         )
         self.assertEqual(response.status_code, 400)
         response_data = json.loads(response.content.decode('utf-8'))
-        message = 'The exam_id does not exist.'
+        message = (
+            'Cannot find proctored exam in course_id=c/d/e with content_id={content_id}'.format(
+                content_id=proctored_exam.content_id,
+            )
+        )
         self.assertEqual(response_data['detail'], message)
 
     def test_get_exam_insufficient_args(self):
@@ -1869,7 +1879,8 @@ def test_restart_exam_attempt(self):
         response_data = json.loads(response.content.decode('utf-8'))
         self.assertEqual(
             response_data['detail'],
-            'Cannot create new exam attempt for exam_id = 1 and user_id = 1 because it already exists!'
+            'Cannot create new exam attempt for exam_id=1 and user_id=1 in course_id=a/b/c '
+            'because it already exists!'
         )
 
     def test_stop_exam_attempt(self):
@@ -2433,7 +2444,7 @@ def test_stop_unstarted_attempt(self):
 
         self.assertEqual(response.status_code, 400)
         response_data = json.loads(response.content.decode('utf-8'))
-        self.assertEqual(response_data['detail'], 'Attempted to access attempt_id 0 but it does not exist.')
+        self.assertEqual(response_data['detail'], 'Attempted to update attempt_id=0 but it does not exist.')
 
     def test_get_exam_attempt(self):
         """
diff --git a/edx_proctoring/utils.py b/edx_proctoring/utils.py
index ab53d6dbfb8..dae2dfd7184 100644
--- a/edx_proctoring/utils.py
+++ b/edx_proctoring/utils.py
@@ -115,7 +115,7 @@ def locate_attempt_by_attempt_code(attempt_code):
         if not attempt_obj:
             # still can't find, error out
             err_msg = (
-                u'Could not locate attempt_code: {attempt_code}'.format(attempt_code=attempt_code)
+                'Could not locate attempt_code={attempt_code}'.format(attempt_code=attempt_code)
             )
             log.error(err_msg)
             is_archived = None
diff --git a/edx_proctoring/views.py b/edx_proctoring/views.py
index e30507468cf..224d3b2c4fa 100644
--- a/edx_proctoring/views.py
+++ b/edx_proctoring/views.py
@@ -19,7 +19,7 @@
 from django.core.exceptions import ObjectDoesNotExist
 from django.core.paginator import Paginator
 from django.shortcuts import redirect
-from django.urls import NoReverseMatch, reverse
+from django.urls import reverse
 from django.utils.decorators import method_decorator
 from django.utils.translation import ugettext as _
 
@@ -619,22 +619,19 @@ def get(self, request, attempt_id):
         HTTP GET Handler. Returns the status of the exam attempt.
         """
         attempt = get_exam_attempt_by_id(attempt_id)
+        user_id = request.user.id
 
         if not attempt:
             err_msg = (
-                'Attempted to access attempt_id {attempt_id} but '
-                'it does not exist.'.format(
-                    attempt_id=attempt_id
-                )
+                'Attempted to get attempt_id={attempt_id} but this attempt does not '
+                'exist.'.format(attempt_id=attempt_id)
             )
             raise StudentExamAttemptDoesNotExistsException(err_msg)
         # make sure the the attempt belongs to the calling user_id
-        if attempt['user']['id'] != request.user.id:
+        if attempt['user']['id'] != user_id:
             err_msg = (
-                'Attempted to access attempt_id {attempt_id} but '
-                'does not have access to it.'.format(
-                    attempt_id=attempt_id
-                )
+                'user_id={user_id} attempted to get attempt_id={attempt_id} but '
+                'does not have authorization.'.format(user_id=user_id, attempt_id=attempt_id)
             )
             raise ProctoredExamPermissionDenied(err_msg)
 
@@ -667,24 +664,26 @@ def put(self, request, attempt_id):
 
         """
         attempt = get_exam_attempt_by_id(attempt_id)
+        user_id = request.user.id
 
         if not attempt:
             err_msg = (
-                'Attempted to access attempt_id {attempt_id} but '
-                'it does not exist.'.format(
+                'Attempted to update attempt_id={attempt_id} but it does not exist.'.format(
                     attempt_id=attempt_id
                 )
             )
             raise StudentExamAttemptDoesNotExistsException(err_msg)
 
         course_id = attempt['proctored_exam']['id']
-        user_id = request.user.id
         action = request.data.get('action')
 
         err_msg = (
-            'Attempted to access attempt_id {attempt_id} but '
-            'does not have access to it.'.format(
-                attempt_id=attempt_id
+            'user_id={user_id} attempted to update attempt_id={attempt_id} in '
+            'course_id={course_id} but does not have access to it. (action={action})'.format(
+                user_id=user_id,
+                attempt_id=attempt_id,
+                course_id={course_id},
+                action={action},
             )
         )
 
@@ -744,10 +743,17 @@ def put(self, request, attempt_id):
                 )
             else:
                 exam_attempt_id = False
-            LOG.warning('Browser JS reported problem with proctoring desktop '
-                        'application. Did block user: %s, for attempt: %s',
-                        should_block_user,
-                        attempt['id'])
+            LOG.warning(
+                'Browser JS reported problem with proctoring desktop application. Did block user: '
+                '{should_block_user}. user_id={user_id}, course_id={course_id}, exam_id={exam_id}, '
+                'attempt_id={attempt_id}'.format(
+                    should_block_user=should_block_user,
+                    user_id=user_id,
+                    course_id=course_id,
+                    exam_id=attempt['proctored_exam']['id'],
+                    attempt_id=attempt_id,
+                )
+            )
         elif action == 'decline':
             exam_attempt_id = update_attempt_status(
                 attempt_id,
@@ -771,10 +777,8 @@ def delete(self, request, attempt_id):  # pylint: disable=unused-argument
 
         if not attempt:
             err_msg = (
-                'Attempted to access attempt_id {attempt_id} but '
-                'it does not exist.'.format(
-                    attempt_id=attempt_id
-                )
+                'Attempted to delete attempt_id={attempt_id} but this attempt does not '
+                'exist.'.format(attempt_id=attempt_id)
             )
             raise StudentExamAttemptDoesNotExistsException(err_msg)
 
@@ -856,13 +860,9 @@ def get(self, request):  # pylint: disable=unused-argument
                 critically_low_threshold_pct * float(attempt['allowed_time_limit_mins']) * 60
             )
 
-            exam_url_path = ''
-            try:
-                # resolve the LMS url, note we can't assume we're running in
-                # a same process as the LMS
-                exam_url_path = reverse('jump_to', args=[exam['course_id'], exam['content_id']])
-            except NoReverseMatch:
-                LOG.exception(u"Can't find exam url for course %s", exam['course_id'])
+            # resolve the LMS url, note we can't assume we're running in
+            # a same process as the LMS
+            exam_url_path = reverse('jump_to', args=[exam['course_id'], exam['content_id']])
 
             response_dict = {
                 'in_timed_exam': True,
@@ -912,18 +912,24 @@ def post(self, request):
         start_immediately = request.data.get('start_clock', 'false').lower() == 'true'
         exam_id = request.data.get('exam_id', None)
         attempt_proctored = request.data.get('attempt_proctored', 'false').lower() == 'true'
+        user_id = request.user.id
         exam = get_exam_by_id(exam_id)
 
         # Bypassing the due date check for practice exam
         # because student can attempt the practice after the due date
         if not exam.get("is_practice_exam") and is_exam_passed_due(exam, request.user):
             raise ProctoredExamPermissionDenied(
-                'Attempted to access expired exam with exam_id {exam_id}'.format(exam_id=exam_id)
+                'user_id={user_id} attempted to create an attempt for expired exam '
+                'with exam_id={exam_id} in course_id={course_id}'.format(
+                    user_id=user_id,
+                    exam_id=exam_id,
+                    course_id=exam['course_id'],
+                )
             )
 
         exam_attempt_id = create_exam_attempt(
             exam_id=exam_id,
-            user_id=request.user.id,
+            user_id=user_id,
             taking_as_proctored=attempt_proctored
         )
 
@@ -935,7 +941,7 @@ def post(self, request):
                 ProctoredExamStudentAttemptStatus.declined
             )
         elif start_immediately:
-            start_exam_attempt(exam_id, request.user.id)
+            start_exam_attempt(exam_id, user_id)
 
         data = {'exam_attempt_id': exam_attempt_id}
         return Response(data)
@@ -1173,20 +1179,23 @@ class ProctoredExamAttemptReviewStatus(ProctoredAPIView):
     edx_proctoring/v1/proctored_exam/attempt/(<attempt_id>)/review_status$
 
     Supports:
-        HTTP PUT: Update the is_status_acknowledge flag
+        HTTP PUT: Update the is_status_acknowledged flag
     """
     def put(self, request, attempt_id):     # pylint: disable=unused-argument
         """
-        Update the is_status_acknowledge flag for the specific attempt
+        Update the is_status_acknowledged flag for the specific attempt
         """
         attempt = get_exam_attempt_by_id(attempt_id)
 
         # make sure the the attempt belongs to the calling user_id
         if attempt and attempt['user']['id'] != request.user.id:
             err_msg = (
-                'Attempted to access attempt_id {attempt_id} but '
-                'does not have access to it.'.format(
-                    attempt_id=attempt_id
+                'user_id={user_id} attempted to update attempt_id={attempt_id} '
+                'review status to acknowledged in exam_id={exam_id}, but does not '
+                'have authorization.'.format(
+                    user_id=request.user.id,
+                    attempt_id=attempt_id,
+                    exam_id=attempt['proctored_exam']['id'],
                 )
             )
             raise ProctoredExamPermissionDenied(err_msg)
@@ -1207,7 +1216,9 @@ def post(self, request, external_id):  # pylint: disable=unused-argument
         """
         attempt = get_exam_attempt_by_external_id(external_id)
         if not attempt:
-            LOG.warning(u"Attempt code %r cannot be found.", external_id)
+            LOG.warning(
+                'Attempt cannot be found by external_id={external_id}'.format(external_id=external_id)
+            )
             return Response(data='You have entered an exam code that is not valid.', status=404)
         if attempt['status'] in [ProctoredExamStudentAttemptStatus.created,
                                  ProctoredExamStudentAttemptStatus.download_software_clicked]:
@@ -1237,9 +1248,9 @@ def make_review(self, attempt, data, backend=None):
         if review:
             if not constants.ALLOW_REVIEW_UPDATES:
                 err_msg = (
-                    'We already have a review submitted regarding '
-                    'attempt_code {attempt_code}. We do not allow for updates!'.format(
-                        attempt_code=attempt_code
+                    'We already have a review submitted regarding attempt_code={attempt_code}. '
+                    'We do not allow for updates! (backend={backend})'.format(
+                        attempt_code=attempt_code, backend=backend
                     )
                 )
                 raise ProctoredExamReviewAlreadyExists(err_msg)
@@ -1247,9 +1258,9 @@ def make_review(self, attempt, data, backend=None):
             # we allow updates
             warn_msg = (
                 'We already have a review submitted from our proctoring provider regarding '
-                'attempt_code {attempt_code}. We have been configured to allow for '
-                'updates and will continue...'.format(
-                    attempt_code=attempt_code
+                'attempt_code={attempt_code}. We have been configured to allow for '
+                'updates and will continue... (backend={backend})'.format(
+                    attempt_code=attempt_code, backend=backend
                 )
             )
             LOG.warning(warn_msg)
@@ -1280,8 +1291,8 @@ def make_review(self, attempt, data, backend=None):
         course_id = attempt['proctored_exam']['course_id']
         if review.reviewed_by is not None and not is_user_course_or_global_staff(review.reviewed_by, course_id):
             LOG.warning(
-                'User %(user)s does not have the required permissions to submit '
-                'a review for attempt_code %(attempt_code)s.',
+                'user=%(user)s does not have the required permissions to submit '
+                'a review for attempt_code=%(attempt_code)s.',
                 {'user': review.reviewed_by, 'attempt_code': attempt_code}
             )
 
@@ -1331,10 +1342,8 @@ def post(self, request, external_id):
         attempt = get_exam_attempt_by_external_id(external_id)
         if attempt is None:
             err_msg = (
-                'Attempted to access external exam id {external_id} but '
-                'it does not exist.'.format(
-                    external_id=external_id
-                )
+                'Attempted to access exam attempt with external_id={external_id} '
+                'but it does not exist.'.format(external_id=external_id)
             )
             raise StudentExamAttemptDoesNotExistsException(err_msg)
         if request.user.has_perm('edx_proctoring.can_review_attempt', attempt):
@@ -1396,7 +1405,7 @@ def post(self, request):
         if not attempt_obj:
             # still can't find, error out
             err_msg = (
-                'Could not locate attempt_code: {attempt_code}'.format(attempt_code=attempt_code)
+                'Could not locate attempt_code={attempt_code}'.format(attempt_code=attempt_code)
             )
             raise StudentExamAttemptDoesNotExistsException(err_msg)
         serialized = ProctoredExamStudentAttemptSerializer(attempt_obj).data
@@ -1511,11 +1520,20 @@ def post(self, request, user_id, **kwargs):  # pylint: disable=unused-argument
                 if backend_name in seen or not attempt.taking_as_proctored:
                     continue
                 backend_user_id = obscured_user_id(user_id, backend_name)
-                LOG.info('retiring user %s from %s', user_id, backend_name)
+                LOG.info(
+                    'Retiring user_id={user_id} from backend={backend}'.format(
+                        user_id=user_id, backend=backend_name
+                    )
+                )
                 try:
                     result = get_backend_provider(name=backend_name).retire_user(backend_user_id)
                 except ProctoredBaseException:
-                    LOG.exception('attempting to delete %s (%s) from %s', user_id, backend_user_id, backend_name)
+                    LOG.exception(
+                        'Failed to delete user_id={user_id} (backend_user_id={backend_user_id}) from '
+                        'backend={backend}'.format(
+                            user_id=user_id, backend_user_id=backend_user_id, backend=backend_name
+                        )
+                    )
                     result = False
                 if result is not None:
                     results[backend_name] = result
diff --git a/package.json b/package.json
index 27844032a2d..1f71ae6ca3e 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "@edx/edx-proctoring",
   "//": "Be sure to update the version number in edx_proctoring/__init__.py",
   "//": "Note that the version format is slightly different than that of the Python version when using prereleases.",
-  "version": "3.7.4",
+  "version": "3.7.5",
   "main": "edx_proctoring/static/index.js",
   "repository": {
     "type": "git",