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# Copyright 2020 LINE Corp.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import os
import select
import signal
import socket
import sys
import threading
from wsgiref.simple_server import make_server
from oslo_config import cfg
from oslo_log import log as logging
from prometheus_client import make_wsgi_app
from oslo_metrics import message_router
oslo_metrics_configs = [
cfg.StrOpt('metrics_socket_file',
default='/var/tmp/metrics_collector.sock', # nosec
help='Unix domain socket file to be used'
' to send rpc related metrics'),
cfg.PortOpt('prometheus_port', default=3000,
help='Port number to expose metrics in prometheus format.'),
]
cfg.CONF.register_opts(oslo_metrics_configs, group='oslo_metrics')
LOG = logging.getLogger(__name__)
CONF = cfg.CONF
logging.register_options(CONF)
logging.setup(CONF, 'oslo-metrics')
class MetricsListener():
def __init__(self, socket_path):
self.socket_path = socket_path
self.socket = socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM)
self.unlink(socket_path)
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.socket.bind(self.socket_path)
self.start = True
self.router = message_router.MessageRouter()
def unlink(self, socket_path):
try:
os.unlink(socket_path)
except OSError:
if os.path.exists(socket_path):
raise
def serve(self):
while self.start:
readable, writable, exceptional = select.select(
[self.socket], [], [], 1)
if len(readable) == 0:
continue
try:
LOG.debug("wait for socket.recv")
# 1 message size should be smaller than 65565
msg = self.socket.recv(65565)
LOG.debug("got message")
self.router.process(msg)
except socket.timeout:
pass
def stop(self):
self.socket.close()
self.start = False
httpd = None
def handle_sigterm(_signum, _frame):
LOG.debug("Caught sigterm")
shutdown_thread = threading.Thread(target=httpd.shutdown)
shutdown_thread.start()
def main():
cfg.CONF(sys.argv[1:])
socket_path = cfg.CONF.oslo_metrics.metrics_socket_file
m = MetricsListener(socket_path)
try:
os.chmod(socket_path, 0o660) # nosec
except OSError:
LOG.error("Changing the mode of the file failed.... continuing")
mt = threading.Thread(target=m.serve)
LOG.info("Start oslo.metrics")
mt.start()
app = make_wsgi_app()
try:
global httpd
httpd = make_server('', CONF.oslo_metrics.prometheus_port, app)
signal.signal(signal.SIGTERM, handle_sigterm)
httpd.serve_forever()
except KeyboardInterrupt:
pass
finally:
LOG.info("Try to stop...")
os.remove(cfg.CONF.oslo_metrics.metrics_socket_file)
m.stop()
httpd.server_close()
if __name__ == "__main__":
main()
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