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Add systemd socket activation support #1

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Add systemd socket activation support #1

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20 changes: 20 additions & 0 deletions systemd/torch.service
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Original file line number Diff line number Diff line change
@@ -0,0 +1,20 @@
[Unit]
Description=Torch prometheus proxy

[Service]
ExecStart=/usr/bin/python -m torch
User=torch
Restart=always

# Sandboxing:
PrivateTmp=true
DevicePolicy=closed
ProtectSystem=full
ProtectHome=true
InaccessibleDirectories=/var /sysroot /run
ReadOnlyDirectories=/
PrivateNetwork=true
NoNewPrivileges=true

[Install]
WantedBy=multi-user.target
8 changes: 8 additions & 0 deletions systemd/torch.socket
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Original file line number Diff line number Diff line change
@@ -0,0 +1,8 @@
[Unit]
Description=Torch prometheus proxy socket

[Socket]
ListenStream=/run/torch.sock

[Install]
WantedBy=sockets.target
10 changes: 8 additions & 2 deletions torch/__init__.py
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Expand Up @@ -4,19 +4,25 @@ def main():
import os
from datetime import timedelta
from gevent import wsgi
import gevent.socket as socket
from .collector import PrometheusMetricCollector
class QuietWSGIHandler(wsgi.WSGIHandler):
"""WSGIHandler subclass that will not create an access log"""
def log_request(self, *args):
pass

port = int(os.environ['SERVICE_PORT'])
if os.environ.get('LISTEN_FDS') == '1' and \
os.environ.get('LISTEN_PID') == str(os.getpid()):
listener = socket.fromfd(3, socket.AF_UNIX, socket.SOCK_STREAM)
else:
listener = ('0.0.0.0', int(os.environ['SERVICE_PORT']))

ttl = timedelta(hours=int(os.environ.get('TORCH_TTL', 24)))
metrics_prefix = '/metrics'

application = PrometheusMetricCollector(prefix=metrics_prefix, ttl=ttl)

httpd = wsgi.WSGIServer(('0.0.0.0', port), application, handler_class=QuietWSGIHandler)
httpd = wsgi.WSGIServer(listener, application, handler_class=QuietWSGIHandler)
try:
httpd.serve_forever()
except:
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