Synnefo » snf-ganeti

#!/usr/bin/python -u

#

# Copyright (C) 2013 Google Inc.

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301, USA.

"""Script for providing a large amount of RAPI calls to Ganeti.

"""

# pylint: disable=C0103

# due to invalid name

import sys

from ganeti.rapi.client import GanetiApiError

import qa_config

import qa_node

import qa_rapi

# The purpose of this file is to provide a stable and extensive RAPI workload

# that manipulates the cluster only using RAPI commands, with the assumption

# that an empty cluster was set up beforehand. All the nodes that can be added

# to the cluster should be a part of it, and no instances should be present.

#

# Its intended use is in RAPI compatibility tests, where different versions with

# possibly vastly different QAs must be compared. Running the QA on both

# versions of the cluster will produce RAPI calls, but there is no guarantee

# that they will match, or that functions invoked in between will not change the

# results.

#

# By using only RAPI functions, we are sure to be able to capture and log all

# the changes in cluster state, and be able to compare them afterwards.

#

# The functionality of the QA is still used to generate a functioning,

# RAPI-enabled cluster, and to set up a C{GanetiRapiClient} capable of issuing

# commands to the cluster.

#

# Due to the fact that not all calls issued as a part of the workload might be

# implemented in the different versions of Ganeti, the client does not halt or

# produce a non-zero exit code upon encountering a RAPI error. Instead, it

# reports it and moves on. Any utility comparing the requests should account for

# this.

def MockMethod(*_args, **_kwargs):

  """ Absorbs all arguments, does nothing, returns None.

  """

  return None

def InvokerCreator(fn, name):

  """ Returns an invoker function that will invoke the given function

  with any arguments passed to the invoker at a later time, while

  catching any specific non-fatal errors we would like to know more

  about.

  @type fn arbitrary function

  @param fn The function to invoke later.

  @type name string

  @param name The name of the function, for debugging purposes.

  @rtype function

  """

  def decoratedFn(*args, **kwargs):

    result = None

    try:

      print "Using method %s" % name

      result = fn(*args, **kwargs)

    except GanetiApiError as e:

      print "RAPI error while performing function %s : %s" % \

            (name, str(e))

    return result

  return decoratedFn

RAPI_USERNAME = "ganeti-qa"

class GanetiRapiClientWrapper(object):

  """ Creates and initializes a GanetiRapiClient, and acts as a wrapper invoking

  only the methods that the version of the client actually uses.

  """

  def __init__(self):

    self._client = qa_rapi.Setup(RAPI_USERNAME,

                                 qa_rapi.LookupRapiSecret(RAPI_USERNAME))

  def __getattr__(self, attr):

    """ Fetches an attribute from the underlying client if necessary.

    """

    # Assuming that this method exposes no public methods of its own,

    # and that any private methods are named according to the style

    # guide, this will stop infinite loops in attribute fetches.

    if attr.startswith("_"):

      return self.__getattribute__(attr)

    try:

      return InvokerCreator(self._client.__getattribute__(attr), attr)

    except AttributeError:

      print "Missing method %s; supplying mock method" % attr

      return MockMethod

def Finish(client, fn, *args, **kwargs):

  """ When invoked with a job-starting RAPI client method, it passes along any

  additional arguments and waits until its completion.

  @type client C{GanetiRapiClientWrapper}

  @param client The client wrapper.

  @type fn function

  @param fn A client method returning a job id.

  """

  possible_job_id = fn(*args, **kwargs)

  try:

    # The job ids are returned as both ints and ints represented by strings.

    # This is a pythonic check to see if the content is an int.

    int(possible_job_id)

  except (ValueError, TypeError):

    # As a rule of thumb, failures will return None, and other methods are

    # expected to return at least something

    if possible_job_id is not None:

      print ("Finish called with a method not producing a job id, "

             "returning %s" % possible_job_id)

    return possible_job_id

  success = client.WaitForJobCompletion(possible_job_id)

  result = client.GetJobStatus(possible_job_id)["opresult"][0]

  if success:

    return result

  else:

    print "Error encountered while performing operation: "

    print result

    return None

def TestTags(client, get_fn, add_fn, delete_fn, *args):

  """ Tests whether tagging works.

  @type client C{GanetiRapiClientWrapper}

  @param client The client wrapper.

  @type get_fn function

  @param get_fn A Get*Tags function of the client.

  @type add_fn function

  @param add_fn An Add*Tags function of the client.

  @type delete_fn function

  @param delete_fn A Delete*Tags function of the client.

  To allow this method to work for all tagging functions of the client, use

  named methods.

  """

  get_fn(*args)

  tags = ["tag1", "tag2", "tag3"]

  Finish(client, add_fn, *args, tags=tags, dry_run=True)

  Finish(client, add_fn, *args, tags=tags)

  get_fn(*args)

  Finish(client, delete_fn, *args, tags=tags[:1], dry_run=True)

  Finish(client, delete_fn, *args, tags=tags[:1])

  get_fn(*args)

  Finish(client, delete_fn, *args, tags=tags[1:])

  get_fn(*args)

def TestGetters(client):

  """ Tests the various get functions which only retrieve information about the

  cluster.

  @type client C{GanetiRapiClientWrapper}

  """

  client.GetVersion()

  client.GetFeatures()

  client.GetOperatingSystems()

  client.GetInfo()

  client.GetClusterTags()

  client.GetInstances()

  client.GetInstances(bulk=True)

  client.GetJobs()

  client.GetJobs(bulk=True)

  client.GetNodes()

  client.GetNodes(bulk=True)

  client.GetNetworks()

  client.GetNetworks(bulk=True)

  client.GetGroups()

  client.GetGroups(bulk=True)

def RemoveAllInstances(client):

  """ Queries for a list of instances, then removes them all.

  @type client C{GanetiRapiClientWrapper}

  @param client A wrapped RAPI client.

  """

  instances = client.GetInstances()

  for inst in instances:

    Finish(client, client.DeleteInstance, inst)

  instances = client.GetInstances()

  assert len(instances) == 0

def TestSingleInstance(client, instance_name, alternate_name, node_one,

                       node_two):

  """ Creates an instance, performs operations involving it, and then deletes

  it.

  @type client C{GanetiRapiClientWrapper}

  @param client A wrapped RAPI client.

  @type instance_name string

  @param instance_name The hostname to use.

  @type instance_name string

  @param instance_name Another valid hostname to use.

  @type node_one string

  @param node_one A node on which an instance can be added.

  @type node_two string

  @param node_two A node on which an instance can be added.

  """

  # Check that a dry run works, use string with size and unit

  Finish(client, client.CreateInstance,

         "create", instance_name, "plain", [{"size":"1gb"}], [], dry_run=True,

          os="debian-image", pnode=node_one)

  # Another dry run, numeric size, should work, but still a dry run

  Finish(client, client.CreateInstance,

         "create", instance_name, "plain", [{"size": "1000"}], [{}],

         dry_run=True, os="debian-image", pnode=node_one)

  # Create a smaller instance, and delete it immediately

  Finish(client, client.CreateInstance,

         "create", instance_name, "plain", [{"size":800}], [{}],

         os="debian-image", pnode=node_one)

  Finish(client, client.DeleteInstance, instance_name)

  # Create one instance to use in further tests

  Finish(client, client.CreateInstance,

         "create", instance_name, "plain", [{"size":1200}], [{}],

         os="debian-image", pnode=node_one)

  client.GetInstance(instance_name)

  Finish(client, client.GetInstanceInfo, instance_name)

  Finish(client, client.GetInstanceInfo, instance_name, static=True)

  TestTags(client, client.GetInstanceTags, client.AddInstanceTags,

           client.DeleteInstanceTags, instance_name)

  Finish(client, client.GrowInstanceDisk,

         instance_name, 0, 100, wait_for_sync=True)

  Finish(client, client.RebootInstance,

         instance_name, "soft", ignore_secondaries=True, dry_run=True,

         reason="Hulk smash gently!")

  Finish(client, client.ShutdownInstance,

         instance_name, dry_run=True, no_remember=False,

         reason="Hulk smash hard!")

  Finish(client, client.StartupInstance,

         instance_name, dry_run=True, no_remember=False,

         reason="Not hard enough!")

  Finish(client, client.RebootInstance,

         instance_name, "soft", ignore_secondaries=True, dry_run=False)

  Finish(client, client.ShutdownInstance,

         instance_name, dry_run=False, no_remember=False)

  Finish(client, client.ModifyInstance,

         instance_name, disk_template="drbd", remote_node=node_two)

  Finish(client, client.ModifyInstance,

         instance_name, disk_template="plain")

  Finish(client, client.RenameInstance,

         instance_name, alternate_name, ip_check=True, name_check=True)

  Finish(client, client.RenameInstance, alternate_name, instance_name)

  Finish(client, client.DeactivateInstanceDisks, instance_name)

  Finish(client, client.ActivateInstanceDisks, instance_name)

  Finish(client, client.RecreateInstanceDisks,

         instance_name, [0], [node_one])

  Finish(client, client.StartupInstance,

         instance_name, dry_run=False, no_remember=False)

  client.GetInstanceConsole(instance_name)

  Finish(client, client.ReinstallInstance,

         instance_name, os=None, no_startup=False, osparams={})

  Finish(client, client.DeleteInstance, instance_name, dry_run=True)

  Finish(client, client.DeleteInstance, instance_name)

def Workload(client):

  """ The actual RAPI workload used for tests.

  @type client C{GanetiRapiClientWrapper}

  @param client A wrapped RAPI client.

  """

  # First just the simple information retrievals

  TestGetters(client)

  # Then the only remaining function which is parameter-free

  Finish(client, client.RedistributeConfig)

  TestTags(client, client.GetClusterTags, client.AddClusterTags,

           client.DeleteClusterTags)

  # Generously assume the master is present

  node = qa_config.AcquireNode()

  TestTags(client, client.GetNodeTags, client.AddNodeTags,

           client.DeleteNodeTags, node.primary)

  node.Release()

  # Instance tests

  # First remove all instances the QA might have created

  RemoveAllInstances(client)

  nodes = qa_config.AcquireManyNodes(2)

  instance_one = qa_config.AcquireInstance()

  instance_two = qa_config.AcquireInstance()

  TestSingleInstance(client, instance_one.name, instance_two.name,

                     nodes[0].primary, nodes[1].primary)

  instance_two.Release()

  instance_one.Release()

  qa_config.ReleaseManyNodes(nodes)

def Usage():

  sys.stderr.write("Usage:\n\trapi-workload.py qa-config-file")

def Main():

  if len(sys.argv) < 2:

    Usage()

  qa_config.Load(sys.argv[1])

  # Only the master will be present after a fresh QA cluster setup, so we have

  # to invoke this to get all the other nodes.

  qa_node.TestNodeAddAll()

  client = GanetiRapiClientWrapper()

  Workload(client)

  qa_node.TestNodeRemoveAll()

if __name__ == "__main__":

  Main()