Synnefo

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from datetime import datetime

from django.core.management.base import BaseCommand

from optparse import make_option

from synnefo import quotas

from synnefo.quotas.util import (get_db_holdings, get_quotaholder_holdings,

                                 transform_quotas)

from synnefo.webproject.management.utils import pprint_table

from synnefo.settings import CYCLADES_SERVICE_TOKEN as ASTAKOS_TOKEN

class Command(BaseCommand):

    help = """Reconcile resource usage of Astakos with Cyclades DB.

    Detect unsynchronized usage between Astakos and Cyclades DB resources and

    synchronize them if specified so.

    """

    option_list = BaseCommand.option_list + (

        make_option("--userid", dest="userid",

                    default=None,

                    help="Reconcile resources only for this user"),

        make_option("--fix", dest="fix",

                    default=False,

                    action="store_true",

                    help="Synchronize Astakos quotas with Cyclades DB."),

        make_option("--force",

                    default=False,

                    action="store_true",

                    help="Override Astakos quotas. Force Astakos to impose"

                         " the Cyclades quota, independently of their value.")

    )

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

        write = self.stdout.write

        userid = options['userid']

        # Get holdings from Cyclades DB

        db_holdings = get_db_holdings(userid)

        # Get holdings from QuotaHolder

        qh_holdings = get_quotaholder_holdings(userid)

        users = set(db_holdings.keys())

        users.update(qh_holdings.keys())

        # Remove 'None' user

        users.discard(None)

        if userid and userid not in users:

            write("User '%s' does not exist in Quotaholder!", userid)

            return

        pending_exists = False

        unknown_user_exists = False

        unsynced = []

        for user in users:

            db = db_holdings.get(user, {})

            try:

                qh_all = qh_holdings[user]

            except KeyError:

                write("User '%s' does not exist in Quotaholder!\n" %

                      user)

                unknown_user_exists = True

                continue

            # Assuming only one source

            qh = qh_all.get(quotas.DEFAULT_SOURCE, {})

            qh = transform_quotas(qh)

            for resource in quotas.RESOURCES:

                db_value = db.pop(resource, 0)

                try:

                    qh_value, _, qh_pending = qh[resource]

                except KeyError:

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

                          " for user '%s'!\n" % (resource, user))

                    continue

                if qh_pending:

                    write("Pending commission. User '%s', resource '%s'.\n" %

                          (user, resource))

                    pending_exists = True

                    continue

                if db_value != qh_value:

                    data = (user, resource, db_value, qh_value)

                    unsynced.append(data)

        headers = ("User", "Resource", "Database", "Quotaholder")

        if unsynced:

            pprint_table(self.stderr, unsynced, headers)

            if options["fix"]:

                qh = quotas.Quotaholder.get()

                request = {}

                request["force"] = options["force"]

                request["auto_accept"] = True

                request["name"] = \

                    ("client: reconcile-resources-cyclades, time: %s"

                     % datetime.now())

                request["provisions"] = map(create_provision, unsynced)

                try:

                    qh.issue_commission(ASTAKOS_TOKEN, request)

                except quotas.QuotaLimit:

                    write("Reconciling failed because a limit has been "

                          "reached. Use --force to ignore the check.\n")

                    return

                write("Fixed unsynced resources\n")

        if pending_exists:

            write("Found pending commissions. Run 'snf-manage"

                  " reconcile-commissions-cyclades'\n")

        elif not (unsynced or unknown_user_exists):

            write("Everything in sync.\n")

def create_provision(provision_info):

    user, resource, db_value, qh_value = provision_info

    return {"holder": user,

            "source": quotas.DEFAULT_SOURCE,

            "resource": resource,

            "quantity": db_value - qh_value}