Context manager instead of wrapper

contextmanager.patch

diff --git a/pdc/apps/common/hacks.py b/pdc/apps/common/hacks.py
index ca55552..c9ce891 100644
--- a/pdc/apps/common/hacks.py
+++ b/pdc/apps/common/hacks.py
@@ -5,6 +5,7 @@
 # http://opensource.org/licenses/MIT
 #
 import re
+import contextlib
 
 from django.db import connection
 from django.conf import settings
@@ -14,12 +15,13 @@ from rest_framework import serializers
 from pkg_resources import parse_version
 
 
-def deserialize_wrapper(func, data):
+@contextlib.contextmanager
+def productmd_wrapper():
     """
     Convert generic productmd exceptions into validation errors.
     """
     try:
-        func(data)
+        yield
     except KeyError as e:
         raise serializers.ValidationError(
             {'detail': 'Error parsing productmd metadata.',
diff --git a/pdc/apps/compose/lib.py b/pdc/apps/compose/lib.py
index b63900c..321be52 100644
--- a/pdc/apps/compose/lib.py
+++ b/pdc/apps/compose/lib.py
@@ -91,10 +91,12 @@ def compose__import_rpms(request, release_id, composeinfo, rpm_manifest):
     release_obj = release_models.Release.objects.get(release_id=release_id)
 
     ci = productmd.composeinfo.ComposeInfo()
-    common_hacks.deserialize_wrapper(ci.deserialize, composeinfo)
+    with common_hacks.productmd_wrapper():
+        ci.deserialize(composeinfo)
 
     rm = productmd.rpms.Rpms()
-    common_hacks.deserialize_wrapper(rm.deserialize, rpm_manifest)
+    with common_hacks.productmd_wrapper():
+        rm.deserialize(rpm_manifest)
 
     _maybe_raise_inconsistency_error(ci, rm, 'rpms')
 
@@ -181,10 +183,12 @@ def compose__import_images(request, release_id, composeinfo, image_manifest):
     release_obj = release_models.Release.objects.get(release_id=release_id)
 
     ci = productmd.composeinfo.ComposeInfo()
-    common_hacks.deserialize_wrapper(ci.deserialize, composeinfo)
+    with common_hacks.productmd_wrapper():
+        ci.deserialize(composeinfo)
 
     im = productmd.images.Images()
-    common_hacks.deserialize_wrapper(im.deserialize, image_manifest)
+    with common_hacks.productmd_wrapper():
+        im.deserialize(image_manifest)
 
     _maybe_raise_inconsistency_error(ci, im, 'images')
 
diff --git a/pdc/apps/release/lib.py b/pdc/apps/release/lib.py
index 1af5088..e8fd1e0 100644
--- a/pdc/apps/release/lib.py
+++ b/pdc/apps/release/lib.py
@@ -86,7 +86,8 @@ def release__import_from_composeinfo(request, composeinfo_json):
     Import release including variants and architectures from composeinfo json.
     """
     ci = productmd.composeinfo.ComposeInfo()
-    common_hacks.deserialize_wrapper(ci.deserialize, composeinfo_json)
+    with common_hacks.productmd_wrapper():
+        ci.deserialize(composeinfo_json)
 
     if ci.release.is_layered:
         base_product_obj, _ = _logged_get_or_create(
-- 
2.5.0