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vm_start_async.py
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vm_start_async.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 example to demonstrate how to use an aasynchronous operation,
# namely the asynchronous version of the VM start method.
# The example assumes the presence of a halted VM named "new", starts
# the VM, retrieves the task reference and queries the task's status.
import pprint
import time
import sys
import XenAPI
def main(session):
print "Looking for a halted VM..."
vms = session.xenapi.VM.get_all_records()
vm = None
for vm_ref in vms:
vm_rec = vms[vm_ref]
if not vm_rec['is_a_template'] and not vm_rec['is_control_domain']\
and vm_rec["power_state"] == "Halted":
print "Found it:"
pprint.pprint(vm_rec)
vm = vm_ref
break
if vm is None:
print "Unable to find a halted VM"
return
print "Attempting to start the halted VM asynchronously"
task = session.xenapi.Async.VM.start(vm, False, True)
task_record = session.xenapi.task.get_record(task)
print "The initial contents of the task record:"
pprint.pprint(task_record)
print "Waiting for the task to complete..."
while session.xenapi.task.get_status(task) == "pending":
time.sleep(1)
task_record = session.xenapi.task.get_record(task)
print "The final contents of the task record:"
pprint.pprint(task_record)
if __name__ == "__main__":
if len(sys.argv) != 4:
print "Usage:"
print sys.argv[0], " <url> <username> <password>"
sys.exit(1)
url = sys.argv[1]
username = sys.argv[2]
password = sys.argv[3]
# First acquire a valid session by logging in:
new_session = XenAPI.Session(url)
try:
new_session.xenapi.login_with_password(username, password, "1.0", "xen-api-scripts-vm-start-async.py")
except XenAPI.Failure as f:
print "Failed to acquire a session: %s" % f.details
sys.exit(1)
try:
main(new_session)
finally:
new_session.xenapi.session.logout()