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-rwxr-xr-xsynapse/app/homeserver.py12
-rw-r--r--synapse/config/metrics.py5
2 files changed, 15 insertions, 2 deletions
diff --git a/synapse/app/homeserver.py b/synapse/app/homeserver.py
index 2ba701f53f..aa7c722efc 100755
--- a/synapse/app/homeserver.py
+++ b/synapse/app/homeserver.py
@@ -129,7 +129,8 @@ class SynapseHomeServer(HomeServer):
             location of the web client. This does nothing if web_client is not
             True.
         """
-        web_client = self.get_config().webclient
+        config = self.get_config()
+        web_client = config.webclient
 
         # list containing (path_str, Resource) e.g:
         # [ ("/aaa/bbb/cc", Resource1), ("/aaa/dummy", Resource2) ]
@@ -155,7 +156,7 @@ class SynapseHomeServer(HomeServer):
             self.root_resource = Resource()
 
         metrics_resource = self.get_resource_for_metrics()
-        if metrics_resource is not None:
+        if config.metrics_port is None and metrics_resource is not None:
             desired_tree.append((METRICS_PREFIX, metrics_resource))
 
         # ideally we'd just use getChild and putChild but getChild doesn't work
@@ -234,6 +235,13 @@ class SynapseHomeServer(HomeServer):
             )
             logger.info("Synapse now listening on port %d", config.unsecure_port)
 
+        metrics_resource = self.get_resource_for_metrics()
+        if metrics_resource and config.metrics_port is not None:
+            reactor.listenTCP(
+                config.metrics_port, Site(metrics_resource), interface="127.0.0.1",
+            )
+            logger.info("Metrics now running on 127.0.0.1 port %d", config.metrics_port)
+
 
 def get_version_string():
     try:
diff --git a/synapse/config/metrics.py b/synapse/config/metrics.py
index 90aba10bba..901a429c76 100644
--- a/synapse/config/metrics.py
+++ b/synapse/config/metrics.py
@@ -20,6 +20,7 @@ class MetricsConfig(Config):
     def __init__(self, args):
         super(MetricsConfig, self).__init__(args)
         self.enable_metrics = args.enable_metrics
+        self.metrics_port = args.metrics_port
 
     @classmethod
     def add_arguments(cls, parser):
@@ -29,3 +30,7 @@ class MetricsConfig(Config):
             '--enable-metrics', dest="enable_metrics", action="store_true",
             help="Enable collection and rendering of performance metrics"
         )
+        metrics_group.add_argument(
+            '--metrics-port', metavar="PORT", type=int,
+            help="Separate port to accept metrics requests on (on localhost)"
+        )