Synnefo

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import string

from optparse import make_option

from django.db import transaction

from synnefo.lib.ordereddict import OrderedDict

from synnefo.quotas import util

from synnefo.quotas import enforce

from synnefo.quotas import errors

from snf_django.management.commands import SynnefoCommand, CommandError

from snf_django.management.utils import pprint_table

DEFAULT_RESOURCES = ["cyclades.cpu",

                     "cyclades.ram",

                     "cyclades.floating_ip",

                     ]

class Command(SynnefoCommand):

    help = """Check and fix quota violations for Cyclades resources.

    """

    option_list = SynnefoCommand.option_list + (

        make_option("--max-operations",

                    help="Limit operations per backend."),

        make_option("--users", dest="users",

                    help=("Enforce resources only for the specified list "

                          "of users, e.g uuid1,uuid2")),

        make_option("--exclude-users",

                    help=("Exclude list of users from resource enforcement")),

        make_option("--resources",

                    help="Specify resources to check, default: %s" %

                    ",".join(DEFAULT_RESOURCES)),

        make_option("--fix",

                    default=False,

                    action="store_true",

                    help="Fix violations"),

        make_option("--force",

                    default=False,

                    action="store_true",

                    help=("Confirm actions that may permanently "

                          "remove a vm")),

    )

    def confirm(self):

        self.stdout.write("Confirm? [y/N] ")

        response = raw_input()

        if string.lower(response) not in ['y', 'yes']:

            self.stderr.write("Aborted.\n")

            exit()

    def get_handlers(self, resources):

        def rem(v):

            try:

                resources.remove(v)

                return True

            except ValueError:

                return False

        if resources is None:

            resources = list(DEFAULT_RESOURCES)

        else:

            resources = resources.split(",")

        handlers = [h for h in enforce.RESOURCE_HANDLING if rem(h[0])]

        if resources:

            m = "No such resource '%s'" % resources[0]

            raise CommandError(m)

        return handlers

    @transaction.commit_on_success

    def handle(self, *args, **options):

        write = self.stderr.write

        fix = options["fix"]

        force = options["force"]

        maxops = options["max_operations"]

        if maxops is not None:

            try:

                maxops = int(maxops)

            except ValueError:

                m = "Expected integer max operations."

                raise CommandError(m)

        users = options['users']

        if users is not None:

            users = users.split(',')

        excluded = options['exclude_users']

        excluded = set(excluded.split(',') if excluded is not None else [])

        handlers = self.get_handlers(options["resources"])

        try:

            qh_holdings = util.get_qh_users_holdings(users)

        except errors.AstakosClientException as e:

            raise CommandError(e)

        qh_holdings = sorted(qh_holdings.items())

        resources = set(h[0] for h in handlers)

        dangerous = bool(resources.difference(DEFAULT_RESOURCES))

        actions = {}

        overlimit = []

        viol_id = 0

        for resource, handle_resource, resource_type in handlers:

            if resource_type not in actions:

                actions[resource_type] = OrderedDict()

            actual_resources = enforce.get_actual_resources(resource_type,

                                                            users)

            for user, user_quota in qh_holdings:

                if user in excluded:

                    continue

                for source, source_quota in user_quota.iteritems():

                    try:

                        qh = util.transform_quotas(source_quota)

                        qh_value, qh_limit, qh_pending = qh[resource]

                    except KeyError:

                        write("Resource '%s' does not exist in Quotaholder"

                              " for user '%s' and source '%s'!\n" %

                              (resource, user, source))

                        continue

                    if qh_pending:

                        write("Pending commission for user '%s', source '%s', "

                              "resource '%s'. Skipping\n" %

                              (user, source, resource))

                        continue

                    diff = qh_value - qh_limit

                    if diff > 0:

                        viol_id += 1

                        overlimit.append((viol_id, user, source, resource,

                                          qh_limit, qh_value))

                        relevant_resources = actual_resources[user]

                        handle_resource(viol_id, resource, relevant_resources,

                                        diff, actions)

        if not overlimit:

            write("No violations.\n")

            return

        headers = ("#", "User", "Source", "Resource", "Limit", "Usage")

        pprint_table(self.stdout, overlimit, headers,

                     options["output_format"], title="Violations")

        if any(actions.values()):

            self.stdout.write("\n")

            if fix:

                if dangerous and not force:

                    write("You are enforcing resources that may permanently "

                          "remove a vm.\n")

                    self.confirm()

                write("Applying actions. Please wait...\n")

            title = "Applied Actions" if fix else "Suggested Actions"

            log = enforce.perform_actions(actions, maxops=maxops, fix=fix)

            headers = ("Type", "ID", "State", "Backend", "Action", "Violation")

            if fix:

                headers += ("Result",)

            pprint_table(self.stdout, log, headers,

                         options["output_format"], title=title)