blob: dbbca2f0325940c66b9459c8cc97107e65ec16f6 [file] [log] [blame]
#!/usr/bin/env python
#
# Copyright 2016 the original author or authors.
#
# 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.
#
"""A REST protocol gateway to self-describing GRPC end-points"""
import argparse
import os
import sys
import time
import yaml
from twisted.internet.defer import inlineCallbacks
base_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
sys.path.append(base_dir)
from chameleon.structlog_setup import setup_logging
from chameleon.nethelpers import get_my_primary_local_ipv4
from chameleon.dockerhelpers import get_my_containers_name
defs = dict(
config=os.environ.get('CONFIG', './chameleon.yml'),
consul=os.environ.get('CONSUL', 'localhost:8500'),
external_host_address=os.environ.get('EXTERNAL_HOST_ADDRESS',
get_my_primary_local_ipv4()),
grpc_endpoint=os.environ.get('GRPC_ENDPOINT', 'localhost:50055'),
fluentd=os.environ.get('FLUENTD', None),
instance_id=os.environ.get('INSTANCE_ID', os.environ.get('HOSTNAME', '1')),
internal_host_address=os.environ.get('INTERNAL_HOST_ADDRESS',
get_my_primary_local_ipv4()),
rest_port=os.environ.get('REST_PORT', 8881),
)
def parse_args():
parser = argparse.ArgumentParser()
_help = ('Path to chameleon.yml config file (default: %s). '
'If relative, it is relative to main.py of chameleon.'
% defs['config'])
parser.add_argument('-c', '--config',
dest='config',
action='store',
default=defs['config'],
help=_help)
_help = '<hostname>:<port> to consul agent (default: %s)' % defs['consul']
parser.add_argument(
'-C', '--consul', dest='consul', action='store',
default=defs['consul'],
help=_help)
_help = ('<hostname> or <ip> at which Chameleon is reachable from outside '
'the cluster (default: %s)' % defs['external_host_address'])
parser.add_argument('-E', '--external-host-address',
dest='external_host_address',
action='store',
default=defs['external_host_address'],
help=_help)
_help = ('<hostname>:<port> to fluentd server (default: %s). (If not '
'specified (None), the address from the config file is used'
% defs['fluentd'])
parser.add_argument('-F', '--fluentd',
dest='fluentd',
action='store',
default=defs['fluentd'],
help=_help)
_help = ('<hostname> or <ip> at which Chameleon is reachable from inside'
'the cluster (default: %s)' % defs['internal_host_address'])
parser.add_argument('-H', '--internal-host-address',
dest='internal_host_address',
action='store',
default=defs['internal_host_address'],
help=_help)
_help = ('unique string id of this Chameleon instance (default: %s)'
% defs['instance_id'])
parser.add_argument('-i', '--instance-id',
dest='instance_id',
action='store',
default=defs['instance_id'],
help=_help)
_help = 'omit startup banner log lines'
parser.add_argument('-n', '--no-banner',
dest='no_banner',
action='store_true',
default=False,
help=_help)
_help = ('port number for the rest service (default: %d)'
% defs['rest_port'])
parser.add_argument('-R', '--rest-port',
dest='rest_port',
action='store',
type=int,
default=defs['rest_port'],
help=_help)
_help = "suppress debug and info logs"
parser.add_argument('-q', '--quiet',
dest='quiet',
action='count',
help=_help)
_help = 'enable verbose logging'
parser.add_argument('-v', '--verbose',
dest='verbose',
action='count',
help=_help)
_help = ('use docker container name as Chameleon instance id'
' (overrides -i/--instance-id option)')
parser.add_argument('--instance-id-is-container-name',
dest='instance_id_is_container_name',
action='store_true',
default=False,
help=_help)
args = parser.parse_args()
# post-processing
if args.instance_id_is_container_name:
args.instance_id = get_my_containers_name()
return args
def load_config(args):
path = args.config
if path.startswith('.'):
dir = os.path.dirname(os.path.abspath(__file__))
path = os.path.join(dir, path)
path = os.path.abspath(path)
with open(path) as fd:
config = yaml.load(fd)
return config
banner = r'''
____ _ _
/ ___| | |__ __ _ _ __ ___ ___ | | ___ ___ _ __
| | | '_ \ / _` | | '_ ` _ \ / _ \ | | / _ \ / _ \ | '_ \
| |___ | | | | | (_| | | | | | | | | __/ | | | __/ | (_) | | | | |
\____| |_| |_| \__,_| |_| |_| |_| \___| |_| \___| \___/ |_| |_|
'''
def print_banner(log):
for line in banner.strip('\n').splitlines():
log.info(line)
log.info('(to stop: press Ctrl-C)')
class Main(object):
def __init__(self):
self.args = args = parse_args()
self.config = load_config(args)
verbosity_adjust = (args.verbose or 0) - (args.quiet or 0)
self.log = setup_logging(self.config.get('logging', {}),
args.instance_id,
verbosity_adjust=verbosity_adjust,
fluentd=args.fluentd)
# components
self.rest_server = None
self.grpc_client = None
if not args.no_banner:
print_banner(self.log)
self.startup_components()
def start(self):
self.start_reactor() # will not return except Keyboard interrupt
def startup_components(self):
self.log.info('starting-internal-components')
# TODO init client
# TODO init server
self.log.info('started-internal-services')
@inlineCallbacks
def shutdown_components(self):
"""Execute before the reactor is shut down"""
self.log.info('exiting-on-keyboard-interrupt')
if self.rest_server is not None:
yield self.rest_server.shutdown()
if self.grpc_client is not None:
yield self.grpc_client.shutdown()
def start_reactor(self):
from twisted.internet import reactor
reactor.callWhenRunning(
lambda: self.log.info('twisted-reactor-started'))
reactor.addSystemEventTrigger('before', 'shutdown',
self.shutdown_components)
reactor.run()
if __name__ == '__main__':
Main().start()