WIP: Initial implementation of Podder
Podder is a service which monitors consul registered services
in order to spin up their dependencies. Dependencies are
indicated as SERVICE_x_TAGS as a csv. Podder picks those
dependencies up and spins up specified containers in their own
network. For example, if a voltha_1 is instantiated
podder will spin up chameleon_1 and ofagent_1.
Change-Id: I0c1add8530c78fc761e39fe58cf24f14e96c0ba4
diff --git a/podder/main.py b/podder/main.py
new file mode 100755
index 0000000..cd515e6
--- /dev/null
+++ b/podder/main.py
@@ -0,0 +1,173 @@
+#!/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.
+#
+
+import argparse
+import os
+from consul_mgr import ConsulManager
+from twisted.internet.defer import inlineCallbacks
+from common.utils.nethelpers import get_my_primary_local_ipv4
+from common.utils.structlog_setup import setup_logging
+import yaml
+
+defs = dict(
+ config=os.environ.get('CONFIG', './podder.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()),
+ work_dir=os.environ.get('WORK_DIR', '/tmp/podder')
+)
+
+def parse_args():
+
+ parser = argparse.ArgumentParser()
+
+ _help = ('Path to podder.yml config file (default: %s). '
+ 'If relative, it is relative to main.py of podder.'
+ % 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>:<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 = ('unique string id of this ofagent 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 = "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)
+
+
+ args = parser.parse_args()
+
+ # post-processing
+
+ 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)
+
+ self.consul_manager = None
+
+ if not args.no_banner:
+ print_banner(self.log)
+
+ self.startup_components()
+
+ def start(self):
+ self.start_reactor()
+
+ @inlineCallbacks
+ def startup_components(self):
+ self.log.info('starting-internal-components')
+ args = self.args
+ self.consul_manager = yield ConsulManager(args.consul).run()
+ self.log.info('started-internal-components')
+
+ @inlineCallbacks
+ def shutdown_components(self):
+ """Execute before the reactor is shut down"""
+ self.log.info('exiting-on-keyboard-interrupt')
+ if self.consul_manager is not None:
+ yield self.consul_manager.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()