Make psutil optional

2 files changed, 13 insertions, 5 deletions

diff --git a/synapse/metrics/__init__.py b/synapse/metrics/__init__.py

index cce3dba47c..76d5998d75 100644
--- a/synapse/metrics/__init__.py
+++ b/synapse/metrics/__init__.py
@@ -68,9 +68,18 @@ class Metrics(object):
 
 
 def register_memory_metrics(hs):
-    metric = MemoryUsageMetric(hs)
+    try:
+        import psutil
+        process = psutil.Process()
+        process.memory_info().rss
+    except (ImportError, AttributeError):
+        logger.warn(
+            "psutil is not installed or incorrect version."
+            " Disabling memory metrics."
+        )
+        return
+    metric = MemoryUsageMetric(hs, psutil)
     all_metrics.append(metric)
-    return metric
 
 
 def get_metrics_for(pkg_name):
diff --git a/synapse/metrics/metric.py b/synapse/metrics/metric.py

index 7becbe0491..e81af29895 100644
--- a/synapse/metrics/metric.py
+++ b/synapse/metrics/metric.py
@@ -16,8 +16,6 @@
 
 from itertools import chain
 
-import psutil
-
 
 # TODO(paul): I can't believe Python doesn't have one of these
 def map_concat(func, items):
@@ -167,9 +165,10 @@ class MemoryUsageMetric(object):
     UPDATE_HZ = 2  # number of times to get memory per second
     WINDOW_SIZE_SEC = 30  # the size of the window in seconds
 
-    def __init__(self, hs):
+    def __init__(self, hs, psutil):
         clock = hs.get_clock()
         self.memory_snapshots = []
+
         self.process = psutil.Process()
 
         clock.looping_call(self._update_curr_values, 1000 / self.UPDATE_HZ)