DM-20073: Move ObservationInfo to VisitInfo code to separate method

python/lsst/obs/base/makeRawVisitInfoViaObsInfo.py

@@ -86,14 +86,36 @@ def __call__(self, md, exposureId=None):
             `~lsst.afw.image.VisitInfo` derived from the header using
             a `~astro_metadata_translator.MetadataTranslator`.
         """
-        argDict = dict()
 
         obsInfo = ObservationInfo(md, translator_class=self.metadataTranslator)
 
         # Strip all the cards out that were used
         for c in obsInfo.cards_used:
             del md[c]
 
+        return self.observationInfo2visitInfo(obsInfo, log=self.log)
+
+    @staticmethod
+    def observationInfo2visitInfo(obsInfo, log=None):
+        """Construct a `~lsst.afw.image.VisitInfo` from an
+        `~astro_metadata_translator.ObservationInfo`
+
+        Parameters
+        ----------
+        obsInfo : `astro_metadata_translator.ObservationInfo`
+            Information gathered from the observation metadata.
+        log : `logging.Logger` or `lsst.log.Log`, optional
+            Logger to use for logging informational messages.
+            If `None` logging will be disabled.
+
+        Returns
+        -------
+        visitInfo : `lsst.afw.image.VisitInfo`
+            `~lsst.afw.image.VisitInfo` derived from the supplied
+            `~astro_metadata_translator.ObservationInfo`.
+        """
+        argDict = dict()
+
         # Map the translated information into a form suitable for VisitInfo
         if obsInfo.exposure_time is not None:
             argDict["exposureTime"] = obsInfo.exposure_time.to_value("s")
@@ -170,7 +192,8 @@ def __call__(self, md, exposureId=None):
 
         for key in list(argDict.keys()):  # use a copy because we may delete items
             if argDict[key] is None:
-                self.log.warn("argDict[{}] is None; stripping".format(key, argDict[key]))
+                if log is not None:
+                    log.warn("argDict[{}] is None; stripping".format(key, argDict[key]))
                 del argDict[key]
 
         return VisitInfo(**argDict)

tests/test_cameraMapper.py

@@ -557,7 +557,7 @@ def testWcsRaises(self):
 
     def testConflictRaises(self):
         policy = dafPersist.Policy(os.path.join(ROOT, "ConflictMapper.yaml"))
-        with self.assertRaisesRegexp(
+        with self.assertRaisesRegex(
                 ValueError,
                 r"Duplicate mapping policy for dataset type packages"):
             mapper = lsst.obs.base.CameraMapper(policy=policy, repositoryDir=ROOT, root=ROOT)  # noqa F841

tests/test_makeRawVisitInfoViaObsInfo.py

@@ -25,7 +25,8 @@
 from astropy.time import Time
 import astropy.units as u
 
-from astro_metadata_translator import FitsTranslator, StubTranslator
+import lsst.log
+from astro_metadata_translator import FitsTranslator, StubTranslator, ObservationInfo
 from lsst.daf.base import DateTime
 
 from lsst.obs.base import MakeRawVisitInfoViaObsInfo
@@ -73,14 +74,32 @@ def setUp(self):
 
     def testMakeRawVisitInfoViaObsInfo(self):
         maker = MakeTestableVisitInfo()
-        visitInfo = maker(self.header)
+
+        # Capture the warnings from StubTranslator since they are
+        # confusing to people but irrelevant for the test.
+        with self.assertWarns(UserWarning):
+            with lsst.log.UsePythonLogging():
+                with self.assertLogs(level="WARNING"):
+                    visitInfo = maker(self.header)
 
         self.assertAlmostEqual(visitInfo.getExposureTime(), self.exposure_time.to_value("s"))
         self.assertEqual(visitInfo.getExposureId(), self.exposure_id)
         self.assertEqual(visitInfo.getDate(), DateTime("2001-01-02T03:04:06.123456789Z", DateTime.UTC))
         self.assertNotIn("EXPTIME", self.header)
         self.assertEqual(len(self.header), 2)
 
+    def testObservationInfo2VisitInfo(self):
+
+        with self.assertWarns(UserWarning):
+            obsInfo = ObservationInfo(self.header, translator_class=NewTranslator)
+
+        # No log specified so no log message should appear
+        visitInfo = MakeRawVisitInfoViaObsInfo.observationInfo2visitInfo(obsInfo)
+        self.assertIsInstance(visitInfo, lsst.afw.image.VisitInfo)
+        self.assertAlmostEqual(visitInfo.getExposureTime(), self.exposure_time.to_value("s"))
+        self.assertEqual(visitInfo.getExposureId(), self.exposure_id)
+        self.assertEqual(visitInfo.getDate(), DateTime("2001-01-02T03:04:06.123456789Z", DateTime.UTC))
+
 
 if __name__ == "__main__":
     unittest.main()

tests/test_policy.py

@@ -69,7 +69,7 @@ def test(self):
         butler = dafPersist.Butler(outputs=repoArgs)
 
         with open(os.path.join(firstRepoPath, 'repositoryCfg.yaml')) as f:
-            cfg = yaml.load(f)
+            cfg = yaml.load(f, Loader=yaml.FullLoader)
         self.assertEqual(cfg.policy, policy)
         butler.put(objA, 'basicObject1', {'id': 1})