Wrap all newrelic dependencies in a check to see if the module is loaded

common/djangoapps/newrelic_custom_metrics/middleware.py

@@ -6,7 +6,14 @@ This middleware will only call on the newrelic agent if there are any metrics
 to report for this request, so it will not incur any processing overhead for
 request handlers which do not record custom metrics.
 """
-import newrelic.agent
+import logging
+log = logging.getLogger(__name__)
+try:
+    import newrelic.agent
+except ImportError:
+    log.warning("Unable to load NewRelic agent module")
+    newrelic = None  # pylint: disable=invalid-name
+
 import request_cache
 
 REQUEST_CACHE_KEY = 'newrelic_custom_metrics'
@@ -40,6 +47,8 @@ class NewRelicCustomMetrics(object):
         """
         Report the collected custom metrics to New Relic.
         """
+        if not newrelic:
+            return
         metrics_cache = cls._get_metrics_cache()
         for metric_name, metric_value in metrics_cache.iteritems():
             newrelic.agent.add_custom_parameter(metric_name, metric_value)

common/lib/xmodule/xmodule/seq_module.py

@@ -14,7 +14,6 @@ from lxml import etree
 from xblock.core import XBlock
 from xblock.fields import Integer, Scope, Boolean, String
 from xblock.fragment import Fragment
-import newrelic.agent
 
 from .exceptions import NotFoundError
 from .fields import Date
@@ -25,6 +24,11 @@ from .xml_module import XmlDescriptor
 
 log = logging.getLogger(__name__)
 
+try:
+    import newrelic.agent
+except ImportError:
+    newrelic = None  # pylint: disable=invalid-name
+
 # HACK: This shouldn't be hard-coded to two types
 # OBSOLETE: This obsoletes 'type'
 class_priority = ['video', 'problem']
@@ -385,6 +389,8 @@ class SequenceModule(SequenceFields, ProctoringFields, XModule):
         """
         Capture basic information about this sequence in New Relic.
         """
+        if not newrelic:
+            return
         newrelic.agent.add_custom_parameter('seq.block_id', unicode(self.location))
         newrelic.agent.add_custom_parameter('seq.display_name', self.display_name or '')
         newrelic.agent.add_custom_parameter('seq.position', self.position)
@@ -396,6 +402,8 @@ class SequenceModule(SequenceFields, ProctoringFields, XModule):
         the sequence as a whole. We send this information to New Relic so that
         we can do better performance analysis of courseware.
         """
+        if not newrelic:
+            return
         # Basic count of the number of Units (a.k.a. VerticalBlocks) we have in
         # this learning sequence
         newrelic.agent.add_custom_parameter('seq.num_units', len(display_items))
@@ -414,6 +422,8 @@ class SequenceModule(SequenceFields, ProctoringFields, XModule):
         """
         Capture information about the current selected Unit within the Sequence.
         """
+        if not newrelic:
+            return
         # Positions are stored with indexing starting at 1. If we get into a
         # weird state where the saved position is out of bounds (e.g. the
         # content was changed), avoid going into any details about this unit.