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watch-all-events.py
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watch-all-events.py
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#!/usr/bin/env python
# Copyright (c) Cloud Software Group, Inc.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1) Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# 2) Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials
# provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
# OF THE POSSIBILITY OF SUCH DAMAGE.
# Simple python example to demonstrate how to use the event system.
# Logs into the server, registers for events on all classes and prints
# them to the screen as they are received.
import XenAPI
import sys
import time
iso8601 = "%Y%m%dT%H:%M:%SZ"
def main(session):
try:
# interval in seconds, after which the event_from call should time out
call_timeout = 30.0
# interval (in seconds) between two subsequent event_from calls
polling_interval = 10
# the output of event_from includes a token, which can be passed into a
# subsequent event_from call to retrieve only the events that have occurred
# since the last call; if an empty string is passed, event_from will return
# all events (this is normally done for the very first call)
token = ''
# get events for all classes
event_types = ["*"]
while True:
try:
print "Polling for events..."
output = session.xenapi.event_from(event_types, token, call_timeout)
events = output['events']
token = output['token']
print "Number of events retrieved: %s" % len(events)
now = time.strftime(iso8601, time.gmtime(time.time()))
# Print the events out in a nice format:
fmt = "%18s %8s %s %20s %5s %s %s"
if len(events) > 0:
hdr = fmt % ("time", "id", "ref", "class", "type", "name of object", "snapshot")
print "-" * (len(hdr))
print hdr
print "-" * (len(hdr))
for event in events:
name = "n/a"
snapshot = ''
if "snapshot" in event.keys():
snapshot = event['snapshot']
if "name_label" in snapshot.keys():
name = snapshot['name_label']
print fmt % (now, event['id'], event["ref"], event['class'], event['operation'], name, repr(snapshot))
print "Waiting for %s seconds before next poll..." % polling_interval
time.sleep(polling_interval)
except KeyboardInterrupt:
break
except XenAPI.Failure as e:
print e.details
sys.exit(1)
finally:
session.xenapi.session.logout()
def print_usage():
print """
Usage:
%s <url> <username> <password>
or
%s [http://]localhost [<username>] [<password>]
""" % (sys.argv[0], sys.argv[0])
if __name__ == "__main__":
if len(sys.argv) < 2:
print_usage()
sys.exit(1)
url = sys.argv[1]
username = sys.argv[2] if len(sys.argv) > 2 else ""
password = sys.argv[3] if len(sys.argv) > 3 else ""
# First acquire a valid session by logging in:
if url == "http://localhost" or url == "localhost":
new_session = XenAPI.xapi_local()
else:
new_session = XenAPI.Session(url)
try:
new_session.xenapi.login_with_password(username, password, '1.0', 'xen-api-scripts-watch-all-events.py')
except XenAPI.Failure as f:
print "Failed to acquire a session: %s" % f.details
sys.exit(1)
main(new_session)