BUG: Fix check for latest on CompoundService

Fixes issue #170
Unidata · Mar 30, 2018 · 620fea2 · 620fea2
1 parent 0d72c80
commit 620fea2
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diff --git a/siphon/catalog.py b/siphon/catalog.py
@@ -668,6 +668,14 @@ def __init__(self, service_node):
         self.services = services
         self.number_of_subservices = subservices
 
+    def is_resolver(self):
+        """Return whether the service is a resolver service.
+
+        For a compound service, this is always False because it will never be
+        a resolver.
+        """
+        return False
+
 
 def _find_base_tds_url(catalog_url):
     """Identify the base URL of the THREDDS server from the catalog URL.

diff --git a/siphon/tests/fixtures/latest_resolver_on_latest_dataset b/siphon/tests/fixtures/latest_resolver_on_latest_dataset
@@ -0,0 +1,58 @@
+interactions:
+- request:
+    body: null
+    headers:
+      Accept: ['*/*']
+      Accept-Encoding: ['gzip, deflate']
+      Connection: [keep-alive]
+      User-Agent: [Siphon (0.4.0+264.g0d72c80.dirty)]
+    method: GET
+    uri: http://thredds.ucar.edu/thredds/catalog/grib/NCEP/GFS/Global_0p25deg_ana/latest.xml
+  response:
+    body:
+      string: !!binary |
+        H4sIAAAAAAAAA+xZUW/iOBB+P+n+wyj30ko0DnR3b7cH7HHQdpEWigrdSvuCTGLAd4kd2Q5d9tff
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+        lE2TZC9LLMlBmk2Gx+8Jb9+HqB8lfvnm28RfwtsSOUT7AME0wNqLNIdU4qJJjviqaa/fhzyY7fFw
+        p1Ldf5OJ4BlTO7IlcnCx5ooqbpP8gMY7LVvxFcvm3k++47cV7zegrdLylZ5vM1KqEc2CTP6FT/4d
+        j/2HAcn/Y4Cf/wYAAP//AwAyhIXgZRgAAA==
+    headers:
+      Access-Control-Allow-Origin: ['*']
+      Connection: [Keep-Alive]
+      Content-Encoding: [gzip]
+      Content-Language: [en]
+      Content-Type: [application/xml;charset=UTF-8]
+      Date: ['Fri, 30 Mar 2018 21:51:29 GMT']
+      Keep-Alive: ['timeout=5, max=100']
+      Server: [Apache]
+      Vary: [Accept-Encoding]
+      X-Frame-Options: [SAMEORIGIN]
+    status: {code: 200, message: '200'}
+version: 1
diff --git a/siphon/tests/test_catalog.py b/siphon/tests/test_catalog.py
@@ -311,3 +311,17 @@ def test_catalog_with_embedded_metadata_elements():
     md = cat.metadata
     assert 'external_metadata' in md
     assert 'serviceName' in md
+
+
+@recorder.use_cassette('latest_resolver_on_latest_dataset')
+def test_latest_resolver_fail():
+    """Test getting latest on catalog that does not have a resolver."""
+    cat = TDSCatalog('http://thredds.ucar.edu/thredds/catalog/grib/NCEP/GFS/'
+                     'Global_0p25deg_ana/latest.xml')
+
+    latest = ''
+    with pytest.raises(AttributeError) as excinfo:
+        latest = cat.latest
+
+    assert latest == ''
+    assert '"latest" not available for this catalog' in str(excinfo.value)