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#!/usr/bin/python
"""
#############################################################################
#Copyright 2017 Parker Berberian and others #
# #
#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 requests
import time
import calendar
import subprocess
import sys
import yaml
import os
import logging
from utilities import Utilities
from database import BookingDataBase
class Pharos_api:
"""
This class listens to the dashboard and starts/stops bookings accordingly.
This class should run in the background indefinitely.
Do not execute this file directly - run ./listen.py instead
"""
def __init__(self, config):
"""
init function.
config is the already-parsed config file
"""
self.conf = config
self.servers = yaml.safe_load(open(config['inventory']))
self.log = self.createLogger("pharos_api")
self.polling = 60 / int(config['polling'])
self.log.info(
"polling the dashboard once every %d seconds", self.polling)
self.dashboard = config['dashboard']
self.log.info("connecting to dashboard at %s", self.dashboard)
if os.path.isfile(config['token']):
self.token = open(config['token']).read()
else:
self.token = config['token']
self.updateHeader()
self.database = BookingDataBase(config['database'])
self.log.info("using database at %s", self.conf['database'])
self.deploy_path = os.path.join(
os.path.dirname(os.path.realpath(__file__)), "deploy.py")
if not os.path.isfile(self.deploy_path):
self.log.error(
"Cannot find the deployment script at %s", self.deploy_path)
def setToken(self, token):
"""
Sets authentication token. Not yet needed.
"""
self.token = token
self.updateHeader()
def setTokenFromFile(self, path):
"""
reads auth token from a file. Not yet needed.
"""
self.setToken(open(path).read())
def updateHeader(self):
"""
updates the http header used when talking to the dashboard
"""
self.header = {"Authorization": "Token " + self.token}
def listen(self):
"""
this method will continuously poll the pharos dashboard.
If a booking is found on our server,
we will start a deployment in the background with the
proper config file for the requested
installer and scenario.
"""
self.log.info("%s", "Beginning polling of dashboard")
try:
while True:
time.sleep(self.polling)
url = self.dashboard+"/api/bookings/"
bookings = requests.get(url, headers=self.header).json()
for booking in bookings:
if booking['resource_id'] in self.servers.keys():
self.convertTimes(booking)
self.database.checkAddBooking(booking)
self.checkBookings()
except Exception:
self.log.exception('%s', "failed to connect to dashboard")
self.listen()
def convertTimes(self, booking):
"""
this method will take the time reported by Pharos in the
format yyyy-mm-ddThh:mm:ssZ
and convert it into seconds since the epoch,
for easier management
"""
booking['start'] = self.pharosToEpoch(booking['start'])
booking['end'] = self.pharosToEpoch(booking['end'])
def pharosToEpoch(self, timeStr):
"""
Converts the dates from the dashboard to epoch time.
"""
time_struct = time.strptime(timeStr, '%Y-%m-%dT%H:%M:%SZ')
epoch_time = calendar.timegm(time_struct)
return epoch_time
def checkBookings(self):
"""
This method checks all the bookings in our database to see if any
action is required.
"""
# get all active bookings from database into a usable form
bookings = self.database.getBookings()
for booking in bookings:
# first, check if booking is over
if time.time() > booking[3]:
self.log.info("ending the booking with id %i", booking[0])
self.endBooking(booking)
# Then check if booking has begun and the host is still idle
elif time.time() > booking[2] and booking[7] < 1:
self.log.info("starting the booking with id %i", booking[0])
self.startBooking(booking)
def startBooking(self, booking):
"""
Starts the scheduled booking on the requested host with
the correct config file.
The provisioning process gets spun up in a subproccess,
so the api listener is not interupted.
"""
try:
host = self.servers[booking[1]]
self.log.info("Detected a new booking started for host %s", host)
config_file = self.conf['default_configs']["None"]
try:
config_file = self.conf['default_configs'][booking[4]]
except KeyError:
self.log.warning(
"No installer detected in the booking request.")
self.log.info("New booking started for host %s", host)
self.database.setStatus(booking[0], 1) # mark booking started
if not os.path.isfile(self.deploy_path):
error = "Cannot find the deploment script at %s"
self.log.error(error, self.deploy_path)
subprocess.Popen([
'/usr/bin/python',
self.deploy_path,
'--config', config_file,
'--host', host
])
except Exception:
self.log.exception("Failed to start booking for %s", host)
def endBooking(self, booking):
"""
Resets a host once its booking has ended.
"""
try:
try:
config_file = self.conf['default_configs'][booking[4]]
except KeyError:
warn = "No installer detected in booking request"
self.log.warning("%s", warn)
config_file = self.conf['default_configs']["None"]
host = self.servers[booking[1]]
log = logging.getLogger(host)
log.info('Lease expired. Resetting host %s', host)
self.database.setStatus(booking[0], 3)
if not os.path.isfile(self.deploy_path):
err = "Cannot find deployment script at %s"
self.log.error(err, self.deploy_path)
subprocess.Popen([
'/usr/bin/python',
self.deploy_path,
'--config', config_file,
'--host', host,
'--reset'
])
self.database.removeBooking(booking[0])
except Exception:
self.log.exception("Failed to end booking for %s", host)
def createLogger(self, name):
return Utilities.createLogger(name, self.conf['logging_dir'])
if __name__ == "__main__":
if "--config" not in sys.argv:
print "Specify config file with --config option"
sys.exit(1)
config = None
try:
config_file = sys.argv[1+sys.argv.index('--config')]
config = yaml.safe_load(open(config_file))
except Exception:
sys.exit(1)
api = Pharos_api(config)
api.listen()
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