def main():
'''
Description:
This script will be used on EC2 for configuring the running
instance based on Cloud Engine configuration supplied at
launch time in the user data.
Config Server Status:
200 HTTP OK - Success and no more data of this type
202 HTTP Accepted - Success and more data of this type
404 HTTP Not Found - This may be temporary so try again
'''
# parse the args and setup logging
conf = parse_args()
log_file = {}
if 'pwd' in conf and conf.pwd:
log_file = {'logfile_name': 'audrey.log'}
logger = setup_logging(level=conf.log_level, **log_file)
if not conf.endpoint:
# discover the cloud I'm on
# update the conf with the user data
#conf = dict(vars(conf).items() + user_data.discover().read().items())
vars(conf).update(user_data.discover().read().items())
# ensure the conf is a dictionary, not a namespace
if hasattr(conf, '__dict__'):
conf = vars(conf)
logger.info('Invoked audrey main')
# Create the Client Object and test connectivity
# to CS by negotiating the api version
client = CSClient(**conf)
client.test_connection()
# Get the agent object
agent = AudreyFactory(client.api_version).agent
# run the agent
agent(conf).run()
class AgentV1(object):
'''
contains the main logic for processing
This object is compatible with API Version 1
'''
def __init__(self, conf):
'''
conf: argparse dict
'''
tool_dir = {}
if 'pwd' in conf and conf['pwd']:
tool_dir = {'tool_dir': PWD_TOOLING}
# Create the Client Object
self.client = CSClient(**conf)
self.client.test_connection()
# Get any optional tooling from the Config Server
tooling_status, tarball = self.client.get_tooling()
if tooling_status != 200:
LOGGER.error('Get Tooling returned: %s' % tooling_status)
raise AAErrorGetTooling('Get Tooling returned: %s' % tooling_status)
self.tooling = Tooling(tarball, **tool_dir)
def run(self):
'''
Main agent loop, called by main() in /usr/bin/audrey
'''
# 0 means don't run again
# -1 is non zero so initial runs will happen
config_status = -1
provides_status = -1
max_retry = MAX_RETRY
loop_count = 60
services = []
# Process the Requires and Provides parameters until the HTTP status
# from the get_configs and the get_params both return 200
while config_status or provides_status:
LOGGER.debug('Config Parameter status: ' + str(config_status))
LOGGER.debug('Return Parameter status: ' + str(provides_status))
# Get the Required Configs from the Config Server
if config_status:
config_status, configs = self.client.get_configs()
# Configure the system with the provided Required Configs
if config_status == 200:
services = Service.parse_require_config(configs, self.tooling)
self.tooling.invoke_tooling(services)
# don't do any more config status work
# now that the tooling has run
config_status = 0
else:
LOGGER.info(
'No configuration parameters provided. status: ' + \
str(config_status))
# Get the requested provides from the Config Server
if provides_status:
get_status = self.client.get_provides()[0]
# Gather the values from the system for the requested provides
if get_status == 200:
params_values = Provides().generate_cs_str()
else:
params_values = '|&|'
# Put the requested provides with values to the Config Server
provides_status = self.client.put_provides(params_values)[0]
if provides_status == 200:
# don't operate on params anymore, all have been provided.
provides_status = 0
# Retry a number of times if 404 HTTP Not Found is returned.
if config_status == 404 or provides_status == 404:
LOGGER.error('404 from Config Server.')
LOGGER.error('Required Config status: %s' % config_status)
LOGGER.info('Return Parameter status: %s' % provides_status)
max_retry -= 1
if max_retry < 0:
raise AAError('Too many 404 Config Server responses.')
if loop_count:
loop_count-=1
sleep(SLEEP_SECS)
else:
break
class AgentV1(object):
'''
contains the main logic for processing
This object is compatible with API Version 1
'''
def __init__(self, conf):
'''
conf: argparse dict
'''
tool_dir = {}
if 'pwd' in conf and conf['pwd']:
tool_dir = {'tool_dir': PWD_TOOLING}
# Create the Client Object
self.client = CSClient(**conf)
self.client.test_connection()
# Get any optional tooling from the Config Server
tooling_status, tarball = self.client.get_tooling()
if tooling_status != 200:
LOGGER.error('Get Tooling returned: %s' % tooling_status)
raise AAErrorGetTooling('Get Tooling returned: %s' %
tooling_status)
self.tooling = Tooling(tarball, **tool_dir)
def run(self):
'''
Main agent loop, called by main() in /usr/bin/audrey
'''
# 0 means don't run again
# -1 is non zero so initial runs will happen
config_status = -1
provides_status = -1
max_retry = MAX_RETRY
loop_count = 60
services = []
# Process the Requires and Provides parameters until the HTTP status
# from the get_configs and the get_params both return 200
while config_status or provides_status:
LOGGER.debug('Config Parameter status: ' + str(config_status))
LOGGER.debug('Return Parameter status: ' + str(provides_status))
# Get the Required Configs from the Config Server
if config_status:
config_status, configs = self.client.get_configs()
# Configure the system with the provided Required Configs
if config_status == 200:
services = Service.parse_require_config(
configs, self.tooling)
self.tooling.invoke_tooling(services)
# don't do any more config status work
# now that the tooling has run
config_status = 0
else:
LOGGER.info(
'No configuration parameters provided. status: ' + \
str(config_status))
# Get the requested provides from the Config Server
if provides_status:
get_status = self.client.get_provides()[0]
# Gather the values from the system for the requested provides
if get_status == 200:
params_values = Provides().generate_cs_str()
else:
params_values = '|&|'
# Put the requested provides with values to the Config Server
provides_status = self.client.put_provides(params_values)[0]
if provides_status == 200:
# don't operate on params anymore, all have been provided.
provides_status = 0
# Retry a number of times if 404 HTTP Not Found is returned.
if config_status == 404 or provides_status == 404:
LOGGER.error('404 from Config Server.')
LOGGER.error('Required Config status: %s' % config_status)
LOGGER.info('Return Parameter status: %s' % provides_status)
max_retry -= 1
if max_retry < 0:
raise AAError('Too many 404 Config Server responses.')
if loop_count:
loop_count -= 1
sleep(SLEEP_SECS)
else:
break
