#!/usr/bin/env python
# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright (c) 2011 X.commerce, a business unit of eBay Inc.
# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

# Interactive shell based on Django:
#
# Copyright (c) 2005, the Lawrence Journal-World
# All rights reserved.
#
# 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.
#
#     3. Neither the name of Django nor the names of its contributors may be
#        used to endorse or promote products derived from this software without
#        specific prior written permission.
#
# 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
# OWNER 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.


"""
  CLI interface for nova management.
"""

import gettext
import netaddr
import os
import sys

# If ../nova/__init__.py exists, add ../ to Python search path, so that
# it will override what happens to be installed in /usr/(local/)lib/python...
POSSIBLE_TOPDIR = os.path.normpath(os.path.join(os.path.abspath(sys.argv[0]),
                                   os.pardir,
                                   os.pardir))
if os.path.exists(os.path.join(POSSIBLE_TOPDIR, 'nova', '__init__.py')):
    sys.path.insert(0, POSSIBLE_TOPDIR)

gettext.install('nova', unicode=1)

from nova.api.ec2 import ec2utils
from nova import availability_zones
from nova.compute import instance_types
from nova import config
from nova import context
from nova import db
from nova.db import migration
from nova import exception
from nova.openstack.common import cfg
from nova.openstack.common import cliutils
from nova.openstack.common.db.sqlalchemy import session as db_session
from nova.openstack.common import importutils
from nova.openstack.common import log as logging
from nova.openstack.common import rpc
from nova.openstack.common import timeutils
from nova import quota
from nova.scheduler import rpcapi as scheduler_rpcapi
from nova import servicegroup
from nova import utils
from nova import version

CONF = cfg.CONF
CONF.import_opt('network_manager', 'nova.service')
CONF.import_opt('service_down_time', 'nova.service')
CONF.import_opt('flat_network_bridge', 'nova.network.manager')
CONF.import_opt('num_networks', 'nova.network.manager')
CONF.import_opt('multi_host', 'nova.network.manager')
CONF.import_opt('network_size', 'nova.network.manager')
CONF.import_opt('vlan_start', 'nova.network.manager')
CONF.import_opt('vpn_start', 'nova.network.manager')
CONF.import_opt('default_floating_pool', 'nova.network.floating_ips')
CONF.import_opt('public_interface', 'nova.network.linux_net')

QUOTAS = quota.QUOTAS


# Decorators for actions
def args(*args, **kwargs):
    def _decorator(func):
        func.__dict__.setdefault('args', []).insert(0, (args, kwargs))
        return func
    return _decorator


def param2id(object_id):
    """Helper function to convert various volume id types to internal id.
    args: [object_id], e.g. 'vol-0000000a' or 'volume-0000000a' or '10'
    """
    if '-' in object_id:
        return ec2utils.ec2_vol_id_to_uuid(object_id)
    else:
        return object_id


class VpnCommands(object):
    """Class for managing VPNs."""

    @args('--project', dest="project_id", metavar='<Project name>',
            help='Project name')
    @args('--ip', dest="ip", metavar='<IP Address>', help='IP Address')
    @args('--port', dest="port", metavar='<Port>', help='Port')
    def change(self, project_id, ip, port):
        """Change the ip and port for a vpn.

        this will update all networks associated with a project
        not sure if that's the desired behavior or not, patches accepted

        """
        # TODO(tr3buchet): perhaps this shouldn't update all networks
        # associated with a project in the future
        admin_context = context.get_admin_context()
        networks = db.project_get_networks(admin_context, project_id)
        for network in networks:
            db.network_update(admin_context,
                              network['id'],
                              {'vpn_public_address': ip,
                               'vpn_public_port': int(port)})


class ShellCommands(object):
    def bpython(self):
        """Runs a bpython shell.

        Falls back to Ipython/python shell if unavailable"""
        self.run('bpython')

    def ipython(self):
        """Runs an Ipython shell.

        Falls back to Python shell if unavailable"""
        self.run('ipython')

    def python(self):
        """Runs a python shell.

        Falls back to Python shell if unavailable"""
        self.run('python')

    @args('--shell', dest="shell", metavar='<bpython|ipython|python >',
            help='Python shell')
    def run(self, shell=None):
        """Runs a Python interactive interpreter."""
        if not shell:
            shell = 'bpython'

        if shell == 'bpython':
            try:
                import bpython
                bpython.embed()
            except ImportError:
                shell = 'ipython'
        if shell == 'ipython':
            try:
                import IPython
                # Explicitly pass an empty list as arguments, because
                # otherwise IPython would use sys.argv from this script.
                shell = IPython.Shell.IPShell(argv=[])
                shell.mainloop()
            except ImportError:
                shell = 'python'

        if shell == 'python':
            import code
            try:
                # Try activating rlcompleter, because it's handy.
                import readline
            except ImportError:
                pass
            else:
                # We don't have to wrap the following import in a 'try',
                # because we already know 'readline' was imported successfully.
                import rlcompleter
                readline.parse_and_bind("tab:complete")
            code.interact()

    @args('--path', dest='path', metavar='<path>', help='Script path')
    def script(self, path):
        """Runs the script from the specified path with flags set properly.
        arguments: path"""
        exec(compile(open(path).read(), path, 'exec'), locals(), globals())


def _db_error(caught_exception):
    print caught_exception
    print _("The above error may show that the database has not "
            "been created.\nPlease create a database using "
            "'nova-manage db sync' before running this command.")
    exit(1)


class ProjectCommands(object):
    """Class for managing projects."""

    @args('--project', dest="project_id", metavar='<Project name>',
            help='Project name')
    @args('--key', dest="key", metavar='<key>', help='Key')
    @args('--value', dest="value", metavar='<value>', help='Value')
    def quota(self, project_id, key=None, value=None):
        """Set or display quotas for project."""
        ctxt = context.get_admin_context()
        project_quota = QUOTAS.get_project_quotas(ctxt, project_id)
        if key and key in project_quota:
            if value.lower() == 'unlimited':
                value = -1
            try:
                db.quota_update(ctxt, project_id, key, value)
            except exception.ProjectQuotaNotFound:
                db.quota_create(ctxt, project_id, key, value)
        else:
            print _('%(key)s is not a valid quota key. Valid options are: '
                    '%(options)s.') % {'key': key,
                                       'options': ', '.join(project_quota)}
            sys.exit(2)
        project_quota = QUOTAS.get_project_quotas(ctxt, project_id)
        for key, value in project_quota.iteritems():
            if value['limit'] < 0 or value['limit'] is None:
                value['limit'] = 'unlimited'
            print '%s: %s' % (key, value['limit'])

    @args('--project', dest="project_id", metavar='<Project name>',
            help='Project name')
    def scrub(self, project_id):
        """Deletes data associated with project."""
        admin_context = context.get_admin_context()
        networks = db.project_get_networks(admin_context, project_id)
        for network in networks:
            db.network_disassociate(admin_context, network['id'])
        groups = db.security_group_get_by_project(admin_context, project_id)
        for group in groups:
            db.security_group_destroy(admin_context, group['id'])


AccountCommands = ProjectCommands


class FixedIpCommands(object):
    """Class for managing fixed ip."""

    @args('--host', dest="host", metavar='<host>', help='Host')
    def list(self, host=None):
        """Lists all fixed ips (optionally by host)."""
        ctxt = context.get_admin_context()

        try:
            if host is None:
                fixed_ips = db.fixed_ip_get_all(ctxt)
            else:
                fixed_ips = db.fixed_ip_get_all_by_instance_host(ctxt, host)
        except exception.NotFound as ex:
            print _("error: %s") % ex
            sys.exit(2)

        instances = db.instance_get_all(context.get_admin_context())
        instances_by_uuid = {}
        for instance in instances:
            instances_by_uuid[instance['uuid']] = instance

        print "%-18s\t%-15s\t%-15s\t%s" % (_('network'),
                                              _('IP address'),
                                              _('hostname'),
                                              _('host'))

        all_networks = {}
        try:
            # use network_get_all to retrieve all existing networks
            # this is to ensure that IPs associated with deleted networks
            # will not throw exceptions.
            for network in db.network_get_all(context.get_admin_context()):
                all_networks[network.id] = network
        except exception.NoNetworksFound:
            # do not have any networks, so even if there are IPs, these
            # IPs should have been deleted ones, so return.
            print _('No fixed IP found.')
            return

        has_ip = False
        for fixed_ip in fixed_ips:
            hostname = None
            host = None
            network = all_networks.get(fixed_ip['network_id'])
            if network:
                has_ip = True
                if fixed_ip.get('instance_uuid'):
                    instance = instances_by_uuid.get(fixed_ip['instance_uuid'])
                    if instance:
                        hostname = instance['hostname']
                        host = instance['host']
                    else:
                        print _('WARNING: fixed ip %s allocated to missing'
                                ' instance') % str(fixed_ip['address'])
                print "%-18s\t%-15s\t%-15s\t%s" % (
                        network['cidr'],
                        fixed_ip['address'],
                        hostname, host)

        if not has_ip:
            print _('No fixed IP found.')

    @args('--address', dest="address", metavar='<ip address>',
          help='IP address')
    def reserve(self, address):
        """Mark fixed ip as reserved
        arguments: address"""
        self._set_reserved(address, True)

    @args('--address', dest="address", metavar='<ip address>',
          help='IP address')
    def unreserve(self, address):
        """Mark fixed ip as free to use
        arguments: address"""
        self._set_reserved(address, False)

    def _set_reserved(self, address, reserved):
        ctxt = context.get_admin_context()

        try:
            fixed_ip = db.fixed_ip_get_by_address(ctxt, address)
            if fixed_ip is None:
                raise exception.NotFound('Could not find address')
            db.fixed_ip_update(ctxt, fixed_ip['address'],
                                {'reserved': reserved})
        except exception.NotFound as ex:
            print _("error: %s") % ex
            sys.exit(2)


class FloatingIpCommands(object):
    """Class for managing floating ip."""

    @staticmethod
    def address_to_hosts(addresses):
        """
        Iterate over hosts within an address range.

        If an explicit range specifier is missing, the parameter is
        interpreted as a specific individual address.
        """
        try:
            return [netaddr.IPAddress(addresses)]
        except ValueError:
            net = netaddr.IPNetwork(addresses)
            if net.size < 4:
                reason = _("/%s should be specified as single address(es) "
                           "not in cidr format") % net.prefixlen
                raise exception.InvalidInput(reason=reason)
            else:
                return net.iter_hosts()

    @args('--ip_range', dest="ip_range", metavar='<range>', help='IP range')
    @args('--pool', dest="pool", metavar='<pool>', help='Optional pool')
    @args('--interface', dest="interface", metavar='<interface>',
          help='Optional interface')
    def create(self, ip_range, pool=None, interface=None):
        """Creates floating ips for zone by range."""
        admin_context = context.get_admin_context()
        if not pool:
            pool = CONF.default_floating_pool
        if not interface:
            interface = CONF.public_interface

        ips = ({'address': str(address), 'pool': pool, 'interface': interface}
               for address in self.address_to_hosts(ip_range))
        try:
            db.floating_ip_bulk_create(admin_context, ips)
        except exception.FloatingIpExists as exc:
            # NOTE(simplylizz): Maybe logging would be better here
            # instead of printing, but logging isn't used here and I
            # don't know why.
            print('error: %s' % exc)
            sys.exit(1)

    @args('--ip_range', dest="ip_range", metavar='<range>', help='IP range')
    def delete(self, ip_range):
        """Deletes floating ips by range."""
        admin_context = context.get_admin_context()

        ips = ({'address': str(address)}
               for address in self.address_to_hosts(ip_range))
        db.floating_ip_bulk_destroy(admin_context, ips)

    @args('--host', dest="host", metavar='<host>', help='Host')
    def list(self, host=None):
        """Lists all floating ips (optionally by host)
        Note: if host is given, only active floating IPs are returned"""
        ctxt = context.get_admin_context()
        try:
            if host is None:
                floating_ips = db.floating_ip_get_all(ctxt)
            else:
                floating_ips = db.floating_ip_get_all_by_host(ctxt, host)
        except exception.NoFloatingIpsDefined:
            print _("No floating IP addresses have been defined.")
            return
        for floating_ip in floating_ips:
            instance_uuid = None
            if floating_ip['fixed_ip_id']:
                fixed_ip = db.fixed_ip_get(ctxt, floating_ip['fixed_ip_id'])
                instance_uuid = fixed_ip['instance_uuid']

            print "%s\t%s\t%s\t%s\t%s" % (floating_ip['project_id'],
                                          floating_ip['address'],
                                          instance_uuid,
                                          floating_ip['pool'],
                                          floating_ip['interface'])


class NetworkCommands(object):
    """Class for managing networks."""

    @args('--label', dest="label", metavar='<label>',
            help='Label for network (ex: public)')
    @args('--fixed_range_v4', dest="cidr", metavar='<x.x.x.x/yy>',
            help='IPv4 subnet (ex: 10.0.0.0/8)')
    @args('--num_networks', dest="num_networks", metavar='<number>',
            help='Number of networks to create')
    @args('--network_size', dest="network_size", metavar='<number>',
            help='Number of IPs per network')
    @args('--vlan', dest="vlan_start", metavar='<vlan id>', help='vlan id')
    @args('--vpn', dest="vpn_start", help='vpn start')
    @args('--fixed_range_v6', dest="cidr_v6",
          help='IPv6 subnet (ex: fe80::/64')
    @args('--gateway', dest="gateway", help='gateway')
    @args('--gateway_v6', dest="gateway_v6", help='ipv6 gateway')
    @args('--bridge', dest="bridge",
            metavar='<bridge>',
            help='VIFs on this network are connected to this bridge')
    @args('--bridge_interface', dest="bridge_interface",
            metavar='<bridge interface>',
            help='the bridge is connected to this interface')
    @args('--multi_host', dest="multi_host", metavar="<'T'|'F'>",
            help='Multi host')
    @args('--dns1', dest="dns1", metavar="<DNS Address>", help='First DNS')
    @args('--dns2', dest="dns2", metavar="<DNS Address>", help='Second DNS')
    @args('--uuid', dest="uuid", metavar="<network uuid>",
      help='Network UUID')
    @args('--fixed_cidr', dest="fixed_cidr", metavar='<x.x.x.x/yy>',
            help='IPv4 subnet for fixed IPS (ex: 10.20.0.0/16)')
    @args('--project_id', dest="project_id", metavar="<project id>",
      help='Project id')
    @args('--priority', dest="priority", metavar="<number>",
      help='Network interface priority')
    def create(self, label=None, cidr=None, num_networks=None,
               network_size=None, multi_host=None, vlan_start=None,
               vpn_start=None, cidr_v6=None, gateway=None,
               gateway_v6=None, bridge=None, bridge_interface=None,
               dns1=None, dns2=None, project_id=None, priority=None,
               uuid=None, fixed_cidr=None):
        """Creates fixed ips for host by range."""
        kwargs = dict(((k, v) for k, v in locals().iteritems()
                       if v and k != "self"))
        if multi_host is not None:
            kwargs['multi_host'] = multi_host == 'T'
        net_manager = importutils.import_object(CONF.network_manager)
        net_manager.create_networks(context.get_admin_context(), **kwargs)

    def list(self):
        """List all created networks."""
        _fmt = "%-5s\t%-18s\t%-15s\t%-15s\t%-15s\t%-15s\t%-15s\t%-15s\t%-15s"
        print _fmt % (_('id'),
                          _('IPv4'),
                          _('IPv6'),
                          _('start address'),
                          _('DNS1'),
                          _('DNS2'),
                          _('VlanID'),
                          _('project'),
                          _("uuid"))
        try:
            # Since network_get_all can throw exception.NoNetworksFound
            # for this command to show a nice result, this exception
            # should be caught and handled as such.
            networks = db.network_get_all(context.get_admin_context())
        except exception.NoNetworksFound:
            print _('No networks found')
        else:
            for network in networks:
                print _fmt % (network.id,
                              network.cidr,
                              network.cidr_v6,
                              network.dhcp_start,
                              network.dns1,
                              network.dns2,
                              network.vlan,
                              network.project_id,
                              network.uuid)

    @args('--fixed_range', dest="fixed_range", metavar='<x.x.x.x/yy>',
            help='Network to delete')
    @args('--uuid', dest='uuid', metavar='<uuid>',
            help='UUID of network to delete')
    def delete(self, fixed_range=None, uuid=None):
        """Deletes a network."""

        if fixed_range is None and uuid is None:
            raise Exception(_("Please specify either fixed_range or uuid"))

        net_manager = importutils.import_object(CONF.network_manager)
        if "QuantumManager" in CONF.network_manager:
            if uuid is None:
                raise Exception(_("UUID is required to delete "
                                  "Quantum Networks"))
            if fixed_range:
                raise Exception(_("Deleting by fixed_range is not supported "
                                "with the QuantumManager"))
        # delete the network
        net_manager.delete_network(context.get_admin_context(),
            fixed_range, uuid)

    @args('--fixed_range', dest="fixed_range", metavar='<x.x.x.x/yy>',
            help='Network to modify')
    @args('--project', dest="project", metavar='<project name>',
            help='Project name to associate')
    @args('--host', dest="host", metavar='<host>',
            help='Host to associate')
    @args('--disassociate-project', action="store_true", dest='dis_project',
          default=False, help='Disassociate Network from Project')
    @args('--disassociate-host', action="store_true", dest='dis_host',
          default=False, help='Disassociate Host from Project')
    def modify(self, fixed_range, project=None, host=None,
               dis_project=None, dis_host=None):
        """Associate/Disassociate Network with Project and/or Host
        arguments: network project host
        leave any field blank to ignore it
        """
        admin_context = context.get_admin_context()
        network = db.network_get_by_cidr(admin_context, fixed_range)
        net = {}
        #User can choose the following actions each for project and host.
        #1) Associate (set not None value given by project/host parameter)
        #2) Disassociate (set None by disassociate parameter)
        #3) Keep unchanged (project/host key is not added to 'net')
        if project:
            net['project_id'] = project
        elif dis_project:
            net['project_id'] = None
        if host:
            net['host'] = host
        elif dis_host:
            net['host'] = None
        db.network_update(admin_context, network['id'], net)


class VmCommands(object):
    """Class for mangaging VM instances."""

    @args('--host', dest="host", metavar='<host>', help='Host')
    def list(self, host=None):
        """Show a list of all instances."""

        print ("%-10s %-15s %-10s %-10s %-26s %-9s %-9s %-9s"
               "  %-10s %-10s %-10s %-5s" % (_('instance'),
                                             _('node'),
                                             _('type'),
                                             _('state'),
                                             _('launched'),
                                             _('image'),
                                             _('kernel'),
                                             _('ramdisk'),
                                             _('project'),
                                             _('user'),
                                             _('zone'),
                                             _('index')))

        if host is None:
            instances = db.instance_get_all(context.get_admin_context())
        else:
            instances = db.instance_get_all_by_host(
                           context.get_admin_context(), host)

        for instance in instances:
            print ("%-10s %-15s %-10s %-10s %-26s %-9s %-9s %-9s"
                   " %-10s %-10s %-10s %-5d" % (instance['display_name'],
                                                instance['host'],
                                                instance['instance_type'].name,
                                                instance['vm_state'],
                                                instance['launched_at'],
                                                instance['image_ref'],
                                                instance['kernel_id'],
                                                instance['ramdisk_id'],
                                                instance['project_id'],
                                                instance['user_id'],
                                                instance['availability_zone'],
                                                instance['launch_index']))


class ServiceCommands(object):
    """Enable and disable running services."""

    @args('--host', dest='host', metavar='<host>', help='Host')
    @args('--service', dest='service', metavar='<service>',
            help='Nova service')
    def list(self, host=None, service=None):
        """
        Show a list of all running services. Filter by host & service name.
        """
        servicegroup_api = servicegroup.API()
        ctxt = context.get_admin_context()
        now = timeutils.utcnow()
        services = db.service_get_all(ctxt)
        services = availability_zones.set_availability_zones(ctxt, services)
        if host:
            services = [s for s in services if s['host'] == host]
        if service:
            services = [s for s in services if s['binary'] == service]
        print_format = "%-16s %-36s %-16s %-10s %-5s %-10s"
        print print_format % (
                    _('Binary'),
                    _('Host'),
                    _('Zone'),
                    _('Status'),
                    _('State'),
                    _('Updated_At'))
        for svc in services:
            alive = servicegroup_api.service_is_up(svc)
            art = (alive and ":-)") or "XXX"
            active = 'enabled'
            if svc['disabled']:
                active = 'disabled'
            print print_format % (svc['binary'], svc['host'],
                                  svc['availability_zone'], active, art,
                                  svc['updated_at'])

    @args('--host', dest='host', metavar='<host>', help='Host')
    @args('--service', dest='service', metavar='<service>',
            help='Nova service')
    def enable(self, host, service):
        """Enable scheduling for a service."""
        ctxt = context.get_admin_context()
        svc = db.service_get_by_args(ctxt, host, service)
        if not svc:
            print _("Unable to find service")
            return
        db.service_update(ctxt, svc['id'], {'disabled': False})

    @args('--host', dest='host', metavar='<host>', help='Host')
    @args('--service', dest='service', metavar='<service>',
            help='Nova service')
    def disable(self, host, service):
        """Disable scheduling for a service."""
        ctxt = context.get_admin_context()
        svc = db.service_get_by_args(ctxt, host, service)
        if not svc:
            print _("Unable to find service")
            return
        db.service_update(ctxt, svc['id'], {'disabled': True})

    @args('--host', dest='host', metavar='<host>', help='Host')
    def describe_resource(self, host):
        """Describes cpu/memory/hdd info for host.

        :param host: hostname.

        """
        rpcapi = scheduler_rpcapi.SchedulerAPI()
        result = rpcapi.show_host_resources(context.get_admin_context(),
                                            host=host)

        if not isinstance(result, dict):
            print _('An unexpected error has occurred.')
            print _('[Result]'), result
        else:
            # Printing a total and used_now
            # (NOTE)The host name width 16 characters
            print '%(a)-25s%(b)16s%(c)8s%(d)8s%(e)8s' % {"a": _('HOST'),
                                                         "b": _('PROJECT'),
                                                         "c": _('cpu'),
                                                         "d": _('mem(mb)'),
                                                         "e": _('hdd')}
            print ('%(a)-16s(total)%(b)26s%(c)8s%(d)8s' %
                   {"a": host,
                    "b": result['resource']['vcpus'],
                    "c": result['resource']['memory_mb'],
                    "d": result['resource']['local_gb']})

            print ('%(a)-16s(used_now)%(b)23s%(c)8s%(d)8s' %
                   {"a": host,
                    "b": result['resource']['vcpus_used'],
                    "c": result['resource']['memory_mb_used'],
                    "d": result['resource']['local_gb_used']})

            # Printing a used_max
            cpu_sum = 0
            mem_sum = 0
            hdd_sum = 0
            for p_id, val in result['usage'].items():
                cpu_sum += val['vcpus']
                mem_sum += val['memory_mb']
                hdd_sum += val['root_gb']
                hdd_sum += val['ephemeral_gb']
            print '%(a)-16s(used_max)%(b)23s%(c)8s%(d)8s' % {"a": host,
                                                             "b": cpu_sum,
                                                             "c": mem_sum,
                                                             "d": hdd_sum}

            for p_id, val in result['usage'].items():
                print '%(a)-25s%(b)16s%(c)8s%(d)8s%(e)8s' % {
                        "a": host,
                        "b": p_id,
                        "c": val['vcpus'],
                        "d": val['memory_mb'],
                        "e": val['root_gb'] + val['ephemeral_gb']}


class HostCommands(object):
    """List hosts."""

    def list(self, zone=None):
        """Show a list of all physical hosts. Filter by zone.
        args: [zone]"""
        print "%-25s\t%-15s" % (_('host'),
                                _('zone'))
        ctxt = context.get_admin_context()
        services = db.service_get_all(ctxt)
        services = availability_zones.set_availability_zones(ctxt, services)
        if zone:
            services = [s for s in services if s['availability_zone'] == zone]
        hosts = []
        for srv in services:
            if not [h for h in hosts if h['host'] == srv['host']]:
                hosts.append(srv)

        for h in hosts:
            print "%-25s\t%-15s" % (h['host'], h['availability_zone'])


class DbCommands(object):
    """Class for managing the database."""

    def __init__(self):
        pass

    @args('--version', dest='version', metavar='<version>',
            help='Database version')
    def sync(self, version=None):
        """Sync the database up to the most recent version."""
        return migration.db_sync(version)

    def version(self):
        """Print the current database version."""
        print migration.db_version()

    @args('--max_rows', dest='max_rows', metavar='<number>',
            help='Maximum number of deleted rows to archive')
    def archive_deleted_rows(self, max_rows=None):
        """Move up to max_rows deleted rows from production tables to shadow
        tables.
        """
        if max_rows is not None:
            max_rows = int(max_rows)
        admin_context = context.get_admin_context()
        db.archive_deleted_rows(admin_context, max_rows)


class InstanceTypeCommands(object):
    """Class for managing instance types / flavors."""

    def _print_instance_types(self, name, val):
        is_public = ('private', 'public')[val["is_public"] == 1]
        print ("%s: Memory: %sMB, VCPUS: %s, Root: %sGB, Ephemeral: %sGb, "
            "FlavorID: %s, Swap: %sMB, RXTX Factor: %s, %s, ExtraSpecs %s") % (
            name, val["memory_mb"], val["vcpus"], val["root_gb"],
            val["ephemeral_gb"], val["flavorid"], val["swap"],
            val["rxtx_factor"], is_public, val["extra_specs"])

    @args('--name', dest='name', metavar='<name>',
            help='Name of instance type/flavor')
    @args('--memory', dest='memory', metavar='<memory size>',
            help='Memory size')
    @args('--cpu', dest='vcpus', metavar='<num cores>', help='Number cpus')
    @args('--root_gb', dest='root_gb', metavar='<root_gb>',
            help='Root disk size')
    @args('--ephemeral_gb', dest='ephemeral_gb', metavar='<ephemeral_gb>',
            help='Ephemeral disk size')
    @args('--flavor', dest='flavorid', metavar='<flavor  id>',
            help='Flavor ID')
    @args('--swap', dest='swap', metavar='<swap>', help='Swap')
    @args('--rxtx_factor', dest='rxtx_factor', metavar='<rxtx_factor>',
            help='rxtx_factor')
    @args('--is_public', dest="is_public", metavar='<is_public>',
            help='Make flavor accessible to the public')
    def create(self, name, memory, vcpus, root_gb, ephemeral_gb=0,
               flavorid=None, swap=0, rxtx_factor=1.0, is_public=True):
        """Creates instance types / flavors."""
        try:
            instance_types.create(name, memory, vcpus, root_gb,
                                  ephemeral_gb, flavorid, swap, rxtx_factor,
                                  is_public)
        except exception.InvalidInput, e:
            print _("Must supply valid parameters to create instance_type")
            print e
            sys.exit(1)
        except exception.InstanceTypeExists:
            print _("Instance Type exists.")
            print _("Please ensure instance_type name and flavorid are "
                    "unique.")
            print _("Currently defined instance_type names and flavorids:")
            print
            self.list()
            sys.exit(2)
        except Exception:
            print _("Unknown error")
            sys.exit(3)
        else:
            print _("%s created") % name

    @args('--name', dest='name', metavar='<name>',
            help='Name of instance type/flavor')
    def delete(self, name):
        """Marks instance types / flavors as deleted."""
        try:
            instance_types.destroy(name)
        except exception.InstanceTypeNotFound:
            print _("Valid instance type name is required")
            sys.exit(1)
        except db_session.DBError, e:
            print _("DB Error: %s") % e
            sys.exit(2)
        except Exception:
            sys.exit(3)
        else:
            print _("%s deleted") % name

    @args('--name', dest='name', metavar='<name>',
            help='Name of instance type/flavor')
    def list(self, name=None):
        """Lists all active or specific instance types / flavors."""
        try:
            if name is None:
                inst_types = instance_types.get_all_types()
            else:
                inst_types = instance_types.get_instance_type_by_name(name)
        except db_session.DBError, e:
            _db_error(e)
        if isinstance(inst_types.values()[0], dict):
            for k, v in inst_types.iteritems():
                self._print_instance_types(k, v)
        else:
            self._print_instance_types(name, inst_types)

    @args('--name', dest='name', metavar='<name>',
           help='Name of instance type/flavor')
    @args('--key', dest='key', metavar='<key>',
           help='The key of the key/value pair')
    @args('--value', dest='value', metavar='<value>',
           help='The value of the key/value pair')
    def set_key(self, name, key, value=None):
        """Add key/value pair to specified instance type's extra_specs."""
        try:
            try:
                inst_type = instance_types.get_instance_type_by_name(name)
            except exception.InstanceTypeNotFoundByName, e:
                print e
                sys.exit(2)

            ctxt = context.get_admin_context()
            ext_spec = {key: value}
            db.instance_type_extra_specs_update_or_create(
                            ctxt,
                            inst_type["flavorid"],
                            ext_spec)
            print _("Key %(key)s set to %(value)s on instance"
                    " type %(name)s") % locals()
        except db_session.DBError, e:
            _db_error(e)

    @args('--name', dest='name', metavar='<name>',
           help='Name of instance type/flavor')
    @args('--key', dest='key', metavar='<key>',
           help='The key to be deleted')
    def unset_key(self, name, key):
        """Delete the specified extra spec for instance type."""
        try:
            try:
                inst_type = instance_types.get_instance_type_by_name(name)
            except exception.InstanceTypeNotFoundByName, e:
                print e
                sys.exit(2)

            ctxt = context.get_admin_context()
            db.instance_type_extra_specs_delete(
                        ctxt,
                        inst_type["flavorid"],
                        key)

            print _("Key %(key)s on instance type %(name)s unset") % locals()
        except db_session.DBError, e:
            _db_error(e)


class AgentBuildCommands(object):
    """Class for managing agent builds."""

    def create(self, os, architecture, version, url, md5hash,
                hypervisor='xen'):
        """Creates a new agent build."""
        ctxt = context.get_admin_context()
        agent_build = db.agent_build_create(ctxt,
                                            {'hypervisor': hypervisor,
                                             'os': os,
                                             'architecture': architecture,
                                             'version': version,
                                             'url': url,
                                             'md5hash': md5hash})

    def delete(self, os, architecture, hypervisor='xen'):
        """Deletes an existing agent build."""
        ctxt = context.get_admin_context()
        agent_build_ref = db.agent_build_get_by_triple(ctxt,
                                  hypervisor, os, architecture)
        db.agent_build_destroy(ctxt, agent_build_ref['id'])

    def list(self, hypervisor=None):
        """Lists all agent builds.
        arguments: <none>"""
        fmt = "%-10s  %-8s  %12s  %s"
        ctxt = context.get_admin_context()
        by_hypervisor = {}
        for agent_build in db.agent_build_get_all(ctxt):
            buildlist = by_hypervisor.get(agent_build.hypervisor)
            if not buildlist:
                buildlist = by_hypervisor[agent_build.hypervisor] = []

            buildlist.append(agent_build)

        for key, buildlist in by_hypervisor.iteritems():
            if hypervisor and key != hypervisor:
                continue

            print _('Hypervisor: %s') % key
            print fmt % ('-' * 10, '-' * 8, '-' * 12, '-' * 32)
            for agent_build in buildlist:
                print fmt % (agent_build.os, agent_build.architecture,
                             agent_build.version, agent_build.md5hash)
                print '    %s' % agent_build.url

            print

    def modify(self, os, architecture, version, url, md5hash,
               hypervisor='xen'):
        """Update an existing agent build."""
        ctxt = context.get_admin_context()
        agent_build_ref = db.agent_build_get_by_triple(ctxt,
                                  hypervisor, os, architecture)
        db.agent_build_update(ctxt, agent_build_ref['id'],
                              {'version': version,
                               'url': url,
                               'md5hash': md5hash})


class GetLogCommands(object):
    """Get logging information."""

    def errors(self):
        """Get all of the errors from the log files."""
        error_found = 0
        if CONF.log_dir:
            logs = [x for x in os.listdir(CONF.log_dir) if x.endswith('.log')]
            for file in logs:
                log_file = os.path.join(CONF.log_dir, file)
                lines = [line.strip() for line in open(log_file, "r")]
                lines.reverse()
                print_name = 0
                for index, line in enumerate(lines):
                    if line.find(" ERROR ") > 0:
                        error_found += 1
                        if print_name == 0:
                            print log_file + ":-"
                            print_name = 1
                        linenum = len(lines) - index
                        print _('Line %(linenum)d : %(line)s') % locals()
        if error_found == 0:
            print _('No errors in logfiles!')

    def syslog(self, num_entries=10):
        """Get <num_entries> of the nova syslog events."""
        entries = int(num_entries)
        count = 0
        log_file = ''
        if os.path.exists('/var/log/syslog'):
            log_file = '/var/log/syslog'
        elif os.path.exists('/var/log/messages'):
            log_file = '/var/log/messages'
        else:
            print _('Unable to find system log file!')
            sys.exit(1)
        lines = [line.strip() for line in open(log_file, "r")]
        lines.reverse()
        print _('Last %s nova syslog entries:-') % (entries)
        for line in lines:
            if line.find("nova") > 0:
                count += 1
                print "%s" % (line)
            if count == entries:
                break

        if count == 0:
            print _('No nova entries in syslog!')


class CellCommands(object):
    """Commands for managing cells."""

    @args('--name', dest='name', metavar='<name>',
            help='Name for the new cell')
    @args('--cell_type', dest='cell_type', metavar='<parent|child>',
         help='Whether the cell is a parent or child')
    @args('--username', dest='username', metavar='<username>',
         help='Username for the message broker in this cell')
    @args('--password', dest='password', metavar='<password>',
         help='Password for the message broker in this cell')
    @args('--hostname', dest='hostname', metavar='<hostname>',
         help='Address of the message broker in this cell')
    @args('--port', dest='port', metavar='<number>',
         help='Port number of the message broker in this cell')
    @args('--virtual_host', dest='virtual_host', metavar='<virtual_host>',
         help='The virtual host of the message broker in this cell')
    @args('--woffset', dest='woffset', metavar='<float>')
    @args('--wscale', dest='wscale', metavar='<float>')
    def create(self, name, cell_type='child', username=None, password=None,
               hostname=None, port=None, virtual_host=None,
               woffset=None, wscale=None):

        if cell_type not in ['parent', 'child']:
            print "Error: cell type must be 'parent' or 'child'"
            sys.exit(2)

        is_parent = cell_type == 'parent'
        values = {'name': name,
                  'is_parent': is_parent,
                  'username': username,
                  'password': password,
                  'rpc_host': hostname,
                  'rpc_port': int(port),
                  'rpc_virtual_host': virtual_host,
                  'weight_offset': float(woffset),
                  'weight_scale': float(wscale)}
        ctxt = context.get_admin_context()
        db.cell_create(ctxt, values)

    @args('--cell_name', dest='cell_name', metavar='<cell_name>',
         help='Name of the cell to delete')
    def delete(self, cell_name):
        ctxt = context.get_admin_context()
        db.cell_delete(ctxt, cell_name)

    def list(self):
        ctxt = context.get_admin_context()
        cells = db.cell_get_all(ctxt)
        fmt = "%3s  %-10s  %-6s  %-10s  %-15s  %-5s  %-10s"
        print fmt % ('Id', 'Name', 'Type', 'Username', 'Hostname',
                'Port', 'VHost')
        print fmt % ('-' * 3, '-' * 10, '-' * 6, '-' * 10, '-' * 15,
                '-' * 5, '-' * 10)
        for cell in cells:
            print fmt % (cell.id, cell.name,
                    'parent' if cell.is_parent else 'child',
                    cell.username, cell.rpc_host,
                    cell.rpc_port, cell.rpc_virtual_host)
        print fmt % ('-' * 3, '-' * 10, '-' * 6, '-' * 10, '-' * 15,
                '-' * 5, '-' * 10)


CATEGORIES = {
    'account': AccountCommands,
    'agent': AgentBuildCommands,
    'cell': CellCommands,
    'db': DbCommands,
    'fixed': FixedIpCommands,
    'flavor': InstanceTypeCommands,
    'floating': FloatingIpCommands,
    'host': HostCommands,
    'instance_type': InstanceTypeCommands,
    'logs': GetLogCommands,
    'network': NetworkCommands,
    'project': ProjectCommands,
    'service': ServiceCommands,
    'shell': ShellCommands,
    'vm': VmCommands,
    'vpn': VpnCommands,
}


def methods_of(obj):
    """Get all callable methods of an object that don't start with underscore
    returns a list of tuples of the form (method_name, method)"""
    result = []
    for i in dir(obj):
        if callable(getattr(obj, i)) and not i.startswith('_'):
            result.append((i, getattr(obj, i)))
    return result


def add_command_parsers(subparsers):
    parser = subparsers.add_parser('version')

    parser = subparsers.add_parser('bash-completion')
    parser.add_argument('query_category', nargs='?')

    for category in CATEGORIES:
        command_object = CATEGORIES[category]()

        parser = subparsers.add_parser(category)
        parser.set_defaults(command_object=command_object)

        category_subparsers = parser.add_subparsers(dest='action')

        for (action, action_fn) in methods_of(command_object):
            parser = category_subparsers.add_parser(action)

            action_kwargs = []
            for args, kwargs in getattr(action_fn, 'args', []):
                if kwargs['dest'].startswith('action_kwarg_'):
                    action_kwargs.append(
                            kwargs['dest'][len('action_kwarg_'):])
                else:
                    action_kwargs.append(kwargs['dest'])
                    kwargs['dest'] = 'action_kwarg_' + kwargs['dest']

                parser.add_argument(*args, **kwargs)

            parser.set_defaults(action_fn=action_fn)
            parser.set_defaults(action_kwargs=action_kwargs)

            parser.add_argument('action_args', nargs='*')


category_opt = cfg.SubCommandOpt('category',
                                 title='Command categories',
                                 help='Available categories',
                                 handler=add_command_parsers)


def main():
    """Parse options and call the appropriate class/method."""
    CONF.register_cli_opt(category_opt)
    try:
        config.parse_args(sys.argv)
        logging.setup("nova")
    except cfg.ConfigFilesNotFoundError:
        cfgfile = CONF.config_file[-1] if CONF.config_file else None
        if cfgfile and not os.access(cfgfile, os.R_OK):
            st = os.stat(cfgfile)
            print _("Could not read %s. Re-running with sudo") % cfgfile
            try:
                os.execvp('sudo', ['sudo', '-u', '#%s' % st.st_uid] + sys.argv)
            except Exception:
                print _('sudo failed, continuing as if nothing happened')

        print _('Please re-run nova-manage as root.')
        sys.exit(2)

    if CONF.category.name == "version":
        print version.version_string_with_package()
        sys.exit(0)

    if CONF.category.name == "bash-completion":
        if not CONF.category.query_category:
            print " ".join(CATEGORIES.keys())
        elif CONF.category.query_category in CATEGORIES:
            fn = CATEGORIES[CONF.category.query_category]
            command_object = fn()
            actions = methods_of(command_object)
            print " ".join([k for (k, v) in actions])
        sys.exit(0)

    fn = CONF.category.action_fn
    fn_args = [arg.decode('utf-8') for arg in CONF.category.action_args]
    fn_kwargs = {}
    for k in CONF.category.action_kwargs:
        v = getattr(CONF.category, 'action_kwarg_' + k)
        if v is None:
            continue
        if isinstance(v, basestring):
            v = v.decode('utf-8')
        fn_kwargs[k] = v

    # call the action with the remaining arguments
    # check arguments
    try:
        cliutils.validate_args(fn, *fn_args, **fn_kwargs)
    except cliutils.MissingArgs as e:
        # NOTE(mikal): this isn't the most helpful error message ever. It is
        # long, and tells you a lot of things you probably don't want to know
        # if you just got a single arg wrong.
        print fn.__doc__
        CONF.print_help()
        print e
        sys.exit(1)
    try:
        fn(*fn_args, **fn_kwargs)
        rpc.cleanup()
        sys.exit(0)
    except Exception:
        print _("Command failed, please check log for more info")
        raise

if __name__ == '__main__':
    main()