code cleanup in the views exception handling

tests/webapp/api/test_objectstore_api.py

@@ -90,6 +90,4 @@ def test_objectstore_create_bad_project(webapp, job_sample, jm):
         status=404
     )
     assert resp.status_int == 404
-    assert resp.json['message'] == ("No dataset found for project "
-                                    "u'badproject', contenttype "
-                                    "'objectstore'.")
+    assert resp.json['message'] == "No project with name badproject"

tests/webapp/api/test_resultset_api.py

@@ -44,7 +44,7 @@ def test_resultset_list_bad_project(webapp, jm):
     )
 
     assert resp.status_int == 404
-    assert resp.json == {"message": "No dataset found for project u'foo', contenttype 'jobs'."}
+    assert resp.json == {"message": "No project with name foo"}
 
 
 def test_resultset_detail(webapp, eleven_jobs_processed, jm):
@@ -92,7 +92,7 @@ def test_result_set_detail_bad_project(webapp, jm):
         expect_errors=True
     )
     assert resp.status_int == 404
-    assert resp.json == {"message": "No dataset found for project u'foo', contenttype 'jobs'."}
+    assert resp.json == {"message": "No project with name foo"}
 
 
 def test_warning_levels_red_on_fail():

treeherder/model/derived/jobs.py

@@ -764,11 +764,13 @@ class JobsModel(TreeherderModelBase):
 
     def get_json_blob_by_guid(self, guid):
         """retrieves a json_blob given its guid"""
-        return self.get_os_dhub().execute(
+        iter_obj = self.get_os_dhub().execute(
             proc="objectstore.selects.get_json_blob_by_guid",
             placeholders=[guid],
-            debug_show=self.DEBUG
+            debug_show=self.DEBUG,
+            return_type='iter',
         )
+        return self.as_single(iter_obj, "objectstore", guid=guid)
 
     def get_json_blob_list(self, page, limit):
         """

treeherder/webapp/api/views.py

@@ -1,7 +1,6 @@
 import simplejson as json
 import itertools
 
-from django.http import Http404
 from rest_framework import viewsets
 from rest_framework.response import Response
 from rest_framework.decorators import action
@@ -12,6 +11,31 @@ from treeherder.model.derived import (JobsModel, DatasetNotFoundError,
                                       ObjectNotFoundException)
 
 
+def use_jobs_model(project, model_func):
+    """
+    Create a jobsmodel and pass it to the ``func``.
+
+    ``func`` must take a jobsmodel object and return a response object
+
+    Catches exceptions
+    """
+    try:
+        jm = JobsModel(project)
+        return model_func(jm)
+
+    except DatasetNotFoundError as e:
+        return Response(
+            {"message": "No project with name {0}".format(project)},
+            status=404,
+        )
+    except ObjectNotFoundException as e:
+        return Response({"message": unicode(e)}, status=404)
+    except Exception as e:  # pragma nocover
+        return Response({"message": unicode(e)}, status=500)
+    finally:
+        jm.disconnect()
+
+
 class ObjectstoreViewSet(viewsets.ViewSet):
     """
     This view is responsible for the objectstore endpoint.
@@ -24,41 +48,37 @@ class ObjectstoreViewSet(viewsets.ViewSet):
         """
         POST method implementation
         """
-        jm = JobsModel(project)
-        try:
+        def model_func(jm):
             jm.store_job_data(
                 json.dumps(request.DATA),
                 request.DATA['job']['job_guid']
             )
-        except DatasetNotFoundError as e:
-            return Response({"message": str(e)}, status=404)
-        except Exception as e:  # pragma nocover
-            return Response({"message": str(e)}, status=500)
-        finally:
-            jm.disconnect()
-
             return Response({'message': 'well-formed JSON stored'})
 
+        return use_jobs_model(project, model_func)
+
     def retrieve(self, request, project, pk=None):
         """
         GET method implementation for detail view
         """
-        jm = JobsModel(project)
+        def model_func(jm):
             obj = jm.get_json_blob_by_guid(pk)
-        if obj:
-            return Response(json.loads(obj[0]['json_blob']))
-        else:
-            raise Http404()
+            return Response(json.loads(obj['json_blob']))
+
+        return use_jobs_model(project, model_func)
 
     def list(self, request, project):
         """
         GET method implementation for list view
         """
-        page = request.QUERY_PARAMS.get('page', 0)
-        jm = JobsModel(project)
+        page = int(request.QUERY_PARAMS.get('page', 0))
+
+        def model_func(jm):
             objs = jm.get_json_blob_list(page, 10)
             return Response([json.loads(obj['json_blob']) for obj in objs])
 
+        return use_jobs_model(project, model_func)
+
 
 class ArtifactViewSet(viewsets.ViewSet):
     """
@@ -70,23 +90,14 @@ class ArtifactViewSet(viewsets.ViewSet):
         GET method implementation for an artifact blob
 
         """
-        try:
-            jm = JobsModel(project)
+        def model_func(jm):
             obj = jm.get_job_artifact(pk)
             if obj["type"] == "json":
                 obj["blob"] = json.loads(obj["blob"])
-        except DatasetNotFoundError as e:
-            return Response(
-                {"message": "No project with name {0}".format(project)},
-                status=404,
-            )
-        except ObjectNotFoundException as e:
-            return Response({"message": unicode(e)}, status=404)
-        except Exception as e:  # pragma nocover
-            return Response({"message": unicode(e)}, status=500)
-
             return Response(obj)
 
+        return use_jobs_model(project, model_func)
+
 
 class JobsViewSet(viewsets.ViewSet):
     """
@@ -101,8 +112,7 @@ class JobsViewSet(viewsets.ViewSet):
         Return a single job with log_references and
         artifact names and links to the artifact blobs.
         """
-        try:
-            jm = JobsModel(project)
+        def model_func(jm):
             job = jm.get_job(pk)
             job["logs"] = jm.get_log_references(pk)
 
@@ -115,33 +125,21 @@ class JobsViewSet(viewsets.ViewSet):
                 art["resource_uri"] = ref
                 job["artifacts"].append(art)
 
-        except DatasetNotFoundError as e:
-            return Response(
-                {"message": "No project with name {0}".format(project)},
-                status=404,
-            )
-        except ObjectNotFoundException as e:
-            return Response({"message": unicode(e)}, status=404)
-        except Exception as e:  # pragma nocover
-            return Response({"message": unicode(e)}, status=500)
-
             return Response(job)
 
+        return use_jobs_model(project, model_func)
+
     def list(self, request, project):
         """
         GET method implementation for list view
         """
-        try:
         page = request.QUERY_PARAMS.get('page', 0)
-            jm = JobsModel(project)
+
+        def model_func(jm):
             objs = jm.get_job_list(page, 10)
             return Response(objs)
-        except DatasetNotFoundError as e:
-            return Response({"message": unicode(e)}, status=404)
-        except Exception as e:  # pragma nocover
-            return Response({"message": unicode(e)}, status=500)
-        finally:
-            jm.disconnect()
+
+        return use_jobs_model(project, model_func)
 
     @action()
     def update_state(self, request, project, pk=None):
@@ -149,7 +147,8 @@ class JobsViewSet(viewsets.ViewSet):
         Change the state of a job.
         """
         state = request.DATA.get('state', None)
-        jm = JobsModel(project)
+
+        def model_func(jm):
 
             # check that this state is valid
             if state not in jm.STATES:
@@ -165,17 +164,13 @@ class JobsViewSet(viewsets.ViewSet):
             if not pk:  # pragma nocover
                 return Response({"message": "job id required"}, status=400)
 
-        try:
             jm.get_job(pk)
             jm.set_state(pk, state)
-            jm.disconnect()
-        except ObjectNotFoundException as e:
-            return Response({"message": unicode(e)}, status=404)
-        except Exception as e:  # pragma nocover
-            return Response({"message": unicode(e)}, status=500)
 
             return Response({"message": "state updated to '{0}'".format(state)})
 
+        return use_jobs_model(project, model_func)
+
 
 class ResultSetViewSet(viewsets.ViewSet):
     """
@@ -191,10 +186,9 @@ class ResultSetViewSet(viewsets.ViewSet):
 
         filters = ["author"]
 
-        jm = JobsModel(project)
-        try:
         page = request.QUERY_PARAMS.get('page', 0)
 
+        def model_func(jm):
             objs = jm.get_result_set_list(
                 page,
                 10,
@@ -202,12 +196,8 @@ class ResultSetViewSet(viewsets.ViewSet):
                        if k in filters)
             )
             return Response(objs)
-        except DatasetNotFoundError as e:
-            return Response({"message": unicode(e)}, status=404)
-        except Exception as e:  # pragma nocover
-            return Response({"message": unicode(e)}, status=500)
-        finally:
-            jm.disconnect()
+
+        return use_jobs_model(project, model_func)
 
     @classmethod
     def get_warning_level(cls, groups):
@@ -247,9 +237,7 @@ class ResultSetViewSet(viewsets.ViewSet):
         """
         filters = ["job_type_name"]
 
-        jm = JobsModel(project)
-
-        try:
+        def model_func(jm):
             rs = jm.get_result_set_by_id(pk)
             jobs_ungrouped = list(jm.get_result_set_job_list(
                 pk,
@@ -301,14 +289,8 @@ class ResultSetViewSet(viewsets.ViewSet):
                 })
 
             return Response(rs)
-        except DatasetNotFoundError as e:
-            return Response({"message": unicode(e)}, status=404)
-        except ObjectNotFoundException as e:
-            return Response({"message": unicode(e)}, status=404)
-        except Exception as e:  # pragma nocover
-            return Response({"message": unicode(e)}, status=500)
-        finally:
-            jm.disconnect()
+
+        return use_jobs_model(project, model_func)
 
 
 #####################