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##############################################################################
# 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 json
from st2reactor.sensor.base import PollingSensor
class Pharos_api(PollingSensor):
"""
This class listens to the dashboard and starts/stops bookings accordingly.
"""
def getBookingList(self):
return json.loads(
self.sensor_service.get_value(name='bookings', local=False)
)
def updateBookingList(self, blist):
self.sensor_service.set_value(
name='bookings',
value=json.dumps(blist),
local=False
)
def AddBooking(self, new_booking):
"""
checks if booking is in the database, and adds it if it isnt
"""
# first, check if booking is already expired
if time.time() > new_booking['end']:
return
# check if booking already in db
booking_list = self.getBookingList()
if new_booking['id'] in booking_list:
return
new_booking['status'] = 0 # add status code
booking_list.append(new_booking['id'])
name = "booking_" + str(new_booking['id'])
self.sensor_service.set_value(
name=name,
value=json.dumps(new_booking),
local=False
)
self.updateBookingList(booking_list)
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
booking_list = self.getBookingList()
for booking_id in booking_list:
booking = self.getBooking(booking_id)
# first, check if booking is over
if time.time() > booking['end']:
self.log.info("ending the booking with id %i", booking_id)
self.endBooking(booking)
# Then check if booking has begun and the host is still idle
elif time.time() > booking['start'] and booking['status'] < 1:
self.log.info("starting the booking with id %i", booking['id'])
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.
"""
host = self.getServer(pharos_id=booking['resource_id'])['hostname']
self.log.info("Detected a new booking started for host %s", host)
self.setBookingStatus(booking['id'], 1) # mark booking started
# dispatch trigger into system
trigger = "pharoslaas.start_deployment_trigger"
payload = {"host": host, "installer": booking['installer_name']}
payload['scenario'] = booking['scenario_name']
payload['booking'] = booking['id']
self.sensor_service.dispatch(trigger=trigger, payload=payload)
def endBooking(self, booking):
"""
Resets a host once its booking has ended.
"""
host = self.getServer(pharos_id=booking['resource_id'])['hostname']
self.log.info('Lease expired. Resetting host %s', host)
self.setBookingStatus(booking['id'], 3)
self.removeBooking(booking['id'])
# dispatch trigger to clean
host = self.getServer(pharos_id=booking['resource_id'])['hostname']
trigger = "pharoslaas.end_deployment_trigger"
payload = {"host": host, "booking": booking['id']}
if 'vpn_key' in booking.keys():
payload['key'] = booking['vpn_key']
else:
payload['key'] = ''
self.sensor_service.dispatch(trigger=trigger, payload=payload)
def getServer(self, fog_name=None, hostname=None, pharos_id=None):
key = ""
value = ""
if fog_name is not None:
key = "fog_name"
value = fog_name
elif hostname is not None:
key = "hostname"
value = hostname
elif pharos_id is not None:
key = "pharos_id"
value = pharos_id
for server in self.servers:
if server[key] == value:
return server
def getBooking(self, booking_id):
name = "booking_" + str(booking_id)
return json.loads(
self.sensor_service.get_value(
name=name,
local=False
)
)
def setBookingStatus(self, booking_id, status):
booking = self.getBooking(booking_id)
booking['status'] = status
name = "booking_" + str(booking_id)
self.sensor_service.set_value(
name=name,
value=json.dumps(booking),
local=False
)
def removeBooking(self, booking_id):
blist = self.getBookingList()
blist.remove(booking_id)
self.updateBookingList(blist)
name = "booking_" + str(booking_id)
self.sensor_service.delete_value(name=name, local=False)
# Sensor Interface Methods #
def setup(self):
"""
This method is called by stackstorm once to setup this polling sensor.
Basically __init__, assigns instance variables, etc
"""
server_names = json.loads(
self.sensor_service.get_value('hosts', local=False)
)
self.servers = []
for server in server_names:
self.servers.append(
json.loads(
self.sensor_service.get_value(server, local=False)
)
)
self.resource_ids = []
for host in self.servers:
self.resource_ids.append(host['pharos_id'])
self.log = self.sensor_service.get_logger(name=self.__class__.__name__)
self.dashboard = self.sensor_service.get_value(
name='dashboard_url',
local=False
)
self.log.info("connecting to dashboard at %s", self.dashboard)
# get token here for when dashboard supports it
def poll(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.debug("%s", "Beginning polling of dashboard")
try:
url = self.dashboard+"/api/bookings/"
bookings = requests.get(url).json()
for booking in bookings:
if booking['resource_id'] in self.resource_ids:
self.convertTimes(booking)
self.AddBooking(booking)
self.checkBookings()
except Exception:
self.log.exception('%s', "failed to connect to dashboard")
def cleanup(self):
# called when st2 goes down
pass
def add_trigger(self, trigger):
# called when trigger is created
pass
def update_trigger(self, trigger):
# called when trigger is updated
pass
def remove_trigger(self, trigger):
# called when trigger is deleted
pass
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