Fix trimming waveforms after fetching from FDSN Client

CHANGELOG.txt

@@ -32,6 +32,9 @@ master:
      have been deselected due to the default location priorities setting. This
      is a pure usability improvement as it has been confusing users
      (see #2159).
+   * make sure that streams fetched via FDSN are properly trimmed to user
+     requested times if data center serves additional data around the start/end
+     (see #1887, #2298)
  - obspy.io.nordic:
    * Add ability to read and write focal mechanisms and moment tensor
      information. (see #1924)

obspy/CONTRIBUTORS.txt

@@ -60,6 +60,7 @@ Meschede, Matthias
 Michelini, Alberto
 Miller, Nathaniel C.
 Morgenstern, Bernhard
+Murray-Bergquist, Louisa
 Nof, Ran Novitsky
 Panning, Mark P.
 Rapagnani, Giovanni

obspy/clients/fdsn/client.py

@@ -839,6 +839,7 @@ def get_waveforms(self, network, station, location, channel, starttime,
             if attach_response:
                 self._attach_responses(st)
             self._attach_dataselect_url_to_stream(st)
+            st.trim(starttime, endtime)
             return st
 
     def _attach_responses(self, st):

obspy/clients/fdsn/tests/test_client.py

@@ -304,6 +304,20 @@ def test_set_credentials(self):
         # queryauth)
         self.assertEqual(client.user, user)
 
+    def test_trim_stream_after_get_waveform(self):
+        """
+        Tests that stream is properly trimmed to user requested times after
+        fetching from datacenter, see #1887
+        """
+        c = Client(
+            service_mappings={'dataselect':
+                              'http://eida.ipgp.fr/fdsnws/dataselect/1'})
+        starttime = UTCDateTime('2016-11-01T00:00:00')
+        endtime = UTCDateTime('2016-11-01T00:00:10')
+        stream = c.get_waveforms('G', 'PEL', '*', 'LHZ', starttime, endtime)
+        self.assertEqual(starttime, stream[0].stats.starttime)
+        self.assertEqual(endtime, stream[0].stats.endtime)
+
     def test_service_discovery_iris(self):
         """
         Tests the automatic discovery of services with the IRIS endpoint. The