"""
rgw routines
"""
import argparse
import contextlib
import logging

from teuthology.orchestra import run
from teuthology import misc as teuthology
from teuthology import contextutil
from teuthology.exceptions import ConfigError
from tasks.util import get_remote_for_role
from tasks.util.rgw import rgwadmin, wait_for_radosgw
from tasks.util.rados import (create_ec_pool,
                              create_replicated_pool,
                              create_cache_pool)

log = logging.getLogger(__name__)

class RGWEndpoint:
    def __init__(self, hostname=None, port=None, cert=None, dns_name=None, website_dns_name=None):
        self.hostname = hostname
        self.port = port
        self.cert = cert
        self.dns_name = dns_name
        self.website_dns_name = website_dns_name

    def url(self):
        proto = 'https' if self.cert else 'http'
        return '{proto}://{hostname}:{port}/'.format(proto=proto, hostname=self.hostname, port=self.port)

@contextlib.contextmanager
def start_rgw(ctx, config, clients):
    """
    Start rgw on remote sites.
    """
    log.info('Starting rgw...')
    testdir = teuthology.get_testdir(ctx)
    for client in clients:
        (remote,) = ctx.cluster.only(client).remotes.keys()
        cluster_name, daemon_type, client_id = teuthology.split_role(client)
        client_with_id = daemon_type + '.' + client_id
        client_with_cluster = cluster_name + '.' + client_with_id

        client_config = config.get(client)
        if client_config is None:
            client_config = {}
        log.info("rgw %s config is %s", client, client_config)
        cmd_prefix = [
            'sudo',
            'adjust-ulimits',
            'ceph-coverage',
            '{tdir}/archive/coverage'.format(tdir=testdir),
            'daemon-helper',
            'term',
            ]

        rgw_cmd = ['radosgw']

        log.info("Using %s as radosgw frontend", ctx.rgw.frontend)

        endpoint = ctx.rgw.role_endpoints[client]
        frontends = ctx.rgw.frontend
        frontend_prefix = client_config.get('frontend_prefix', None)
        if frontend_prefix:
            frontends += ' prefix={pfx}'.format(pfx=frontend_prefix)

        if endpoint.cert:
            # add the ssl certificate path
            frontends += ' ssl_certificate={}'.format(endpoint.cert.certificate)
            if ctx.rgw.frontend == 'civetweb':
                frontends += ' port={}s'.format(endpoint.port)
            else:
                frontends += ' ssl_port={}'.format(endpoint.port)
        else:
            frontends += ' port={}'.format(endpoint.port)

        rgw_cmd.extend([
            '--rgw-frontends', frontends,
            '-n', client_with_id,
            '--cluster', cluster_name,
            '-k', '/etc/ceph/{client_with_cluster}.keyring'.format(client_with_cluster=client_with_cluster),
            '--log-file',
            '/var/log/ceph/rgw.{client_with_cluster}.log'.format(client_with_cluster=client_with_cluster),
            '--rgw_ops_log_socket_path',
            '{tdir}/rgw.opslog.{client_with_cluster}.sock'.format(tdir=testdir,
                                                     client_with_cluster=client_with_cluster)
	    ])

        keystone_role = client_config.get('use-keystone-role', None)
        if keystone_role is not None:
            if not ctx.keystone:
                raise ConfigError('rgw must run after the keystone task')
            url = 'http://{host}:{port}/v1/KEY_$(tenant_id)s'.format(host=endpoint.hostname,
                                                                     port=endpoint.port)
            ctx.keystone.create_endpoint(ctx, keystone_role, 'swift', url)

            keystone_host, keystone_port = \
                ctx.keystone.public_endpoints[keystone_role]
            rgw_cmd.extend([
                '--rgw_keystone_url',
                'http://{khost}:{kport}'.format(khost=keystone_host,
                                                kport=keystone_port),
                ])


        if client_config.get('dns-name') is not None:
            rgw_cmd.extend(['--rgw-dns-name', endpoint.dns_name])
        if client_config.get('dns-s3website-name') is not None:
            rgw_cmd.extend(['--rgw-dns-s3website-name', endpoint.website_dns_name])

        rgw_cmd.extend([
            '--foreground',
            run.Raw('|'),
            'sudo',
            'tee',
            '/var/log/ceph/rgw.{client_with_cluster}.stdout'.format(tdir=testdir,
                                                       client_with_cluster=client_with_cluster),
            run.Raw('2>&1'),
            ])

        if client_config.get('valgrind'):
            cmd_prefix = teuthology.get_valgrind_args(
                testdir,
                client_with_cluster,
                cmd_prefix,
                client_config.get('valgrind')
                )

        run_cmd = list(cmd_prefix)
        run_cmd.extend(rgw_cmd)

        ctx.daemons.add_daemon(
            remote, 'rgw', client_with_id,
            cluster=cluster_name,
            args=run_cmd,
            logger=log.getChild(client),
            stdin=run.PIPE,
            wait=False,
            )

    # XXX: add_daemon() doesn't let us wait until radosgw finishes startup
    for client in clients:
        endpoint = ctx.rgw.role_endpoints[client]
        url = endpoint.url()
        log.info('Polling {client} until it starts accepting connections on {url}'.format(client=client, url=url))
        (remote,) = ctx.cluster.only(client).remotes.keys()
        wait_for_radosgw(url, remote)

    try:
        yield
    finally:
        for client in clients:
            cluster_name, daemon_type, client_id = teuthology.split_role(client)
            client_with_id = daemon_type + '.' + client_id
            client_with_cluster = cluster_name + '.' + client_with_id
            ctx.daemons.get_daemon('rgw', client_with_id, cluster_name).stop()
            ctx.cluster.only(client).run(
                args=[
                    'rm',
                    '-f',
                    '{tdir}/rgw.opslog.{client}.sock'.format(tdir=testdir,
                                                             client=client_with_cluster),
                    ],
                )

def assign_endpoints(ctx, config, default_cert):
    role_endpoints = {}
    for role, client_config in config.items():
        client_config = client_config or {}
        remote = get_remote_for_role(ctx, role)

        cert = client_config.get('ssl certificate', default_cert)
        if cert:
            # find the certificate created by the ssl task
            if not hasattr(ctx, 'ssl_certificates'):
                raise ConfigError('rgw: no ssl task found for option "ssl certificate"')
            ssl_certificate = ctx.ssl_certificates.get(cert, None)
            if not ssl_certificate:
                raise ConfigError('rgw: missing ssl certificate "{}"'.format(cert))
        else:
            ssl_certificate = None

        port = client_config.get('port', 443 if ssl_certificate else 80)

        # if dns-name is given, use it as the hostname (or as a prefix)
        dns_name = client_config.get('dns-name', '')
        if len(dns_name) == 0 or dns_name.endswith('.'):
            dns_name += remote.hostname

        website_dns_name = client_config.get('dns-s3website-name')
        if website_dns_name is not None and (len(website_dns_name) == 0 or website_dns_name.endswith('.')):
            website_dns_name += remote.hostname

        role_endpoints[role] = RGWEndpoint(remote.hostname, port, ssl_certificate, dns_name, website_dns_name)

    return role_endpoints

@contextlib.contextmanager
def create_pools(ctx, clients):
    """Create replicated or erasure coded data pools for rgw."""

    log.info('Creating data pools')
    for client in clients:
        log.debug("Obtaining remote for client {}".format(client))
        (remote,) = ctx.cluster.only(client).remotes.keys()
        data_pool = 'default.rgw.buckets.data'
        cluster_name, daemon_type, client_id = teuthology.split_role(client)

        if ctx.rgw.ec_data_pool:
            create_ec_pool(remote, data_pool, client, ctx.rgw.data_pool_pg_size,
                           ctx.rgw.erasure_code_profile, cluster_name, 'rgw')
        else:
            create_replicated_pool(remote, data_pool, ctx.rgw.data_pool_pg_size, cluster_name, 'rgw')

        index_pool = 'default.rgw.buckets.index'
        create_replicated_pool(remote, index_pool, ctx.rgw.index_pool_pg_size, cluster_name, 'rgw')

        if ctx.rgw.cache_pools:
            create_cache_pool(remote, data_pool, data_pool + '.cache', 64,
                              64*1024*1024, cluster_name)
    log.debug('Pools created')
    yield

@contextlib.contextmanager
def configure_compression(ctx, clients, compression):
    """ set a compression type in the default zone placement """
    log.info('Configuring compression type = %s', compression)
    for client in clients:
        # XXX: the 'default' zone and zonegroup aren't created until we run RGWRados::init_complete().
        # issue a 'radosgw-admin user list' command to trigger this
        rgwadmin(ctx, client, cmd=['user', 'list'], check_status=True)

        rgwadmin(ctx, client,
                cmd=['zone', 'placement', 'modify', '--rgw-zone', 'default',
                     '--placement-id', 'default-placement',
                     '--compression', compression],
                check_status=True)
    yield

@contextlib.contextmanager
def configure_storage_classes(ctx, clients, storage_classes):
    """ set a compression type in the default zone placement """

    sc = [s.strip() for s in storage_classes.split(',')]

    for client in clients:
        # XXX: the 'default' zone and zonegroup aren't created until we run RGWRados::init_complete().
        # issue a 'radosgw-admin user list' command to trigger this
        rgwadmin(ctx, client, cmd=['user', 'list'], check_status=True)

        for storage_class in sc:
            log.info('Configuring storage class type = %s', storage_class)
            rgwadmin(ctx, client,
                    cmd=['zonegroup', 'placement', 'add',
                        '--rgw-zone', 'default',
                        '--placement-id', 'default-placement',
                        '--storage-class', storage_class],
                    check_status=True)
            rgwadmin(ctx, client,
                    cmd=['zone', 'placement', 'add',
                        '--rgw-zone', 'default',
                        '--placement-id', 'default-placement',
                        '--storage-class', storage_class,
                        '--data-pool', 'default.rgw.buckets.data.' + storage_class.lower()],
                    check_status=True)
    yield

@contextlib.contextmanager
def task(ctx, config):
    """
    For example, to run rgw on all clients::

        tasks:
        - ceph:
        - rgw:

    To only run on certain clients::

        tasks:
        - ceph:
        - rgw: [client.0, client.3]

    or

        tasks:
        - ceph:
        - rgw:
            client.0:
            client.3:

    To run radosgw through valgrind:

        tasks:
        - ceph:
        - rgw:
            client.0:
              valgrind: [--tool=memcheck]
            client.3:
              valgrind: [--tool=memcheck]

    To configure data or index pool pg_size:

        overrides:
          rgw:
            data_pool_pg_size: 256
            index_pool_pg_size: 128
    """
    if config is None:
        config = dict(('client.{id}'.format(id=id_), None)
                      for id_ in teuthology.all_roles_of_type(
                          ctx.cluster, 'client'))
    elif isinstance(config, list):
        config = dict((name, None) for name in config)

    clients = config.keys() # http://tracker.ceph.com/issues/20417

    overrides = ctx.config.get('overrides', {})
    teuthology.deep_merge(config, overrides.get('rgw', {}))

    ctx.rgw = argparse.Namespace()

    ctx.rgw.ec_data_pool = bool(config.pop('ec-data-pool', False))
    ctx.rgw.erasure_code_profile = config.pop('erasure_code_profile', {})
    ctx.rgw.cache_pools = bool(config.pop('cache-pools', False))
    ctx.rgw.frontend = config.pop('frontend', 'civetweb')
    ctx.rgw.compression_type = config.pop('compression type', None)
    ctx.rgw.storage_classes = config.pop('storage classes', None)
    default_cert = config.pop('ssl certificate', None)
    ctx.rgw.data_pool_pg_size = config.pop('data_pool_pg_size', 64)
    ctx.rgw.index_pool_pg_size = config.pop('index_pool_pg_size', 64)
    ctx.rgw.config = config

    log.debug("config is {}".format(config))
    log.debug("client list is {}".format(clients))

    ctx.rgw.role_endpoints = assign_endpoints(ctx, config, default_cert)

    subtasks = [
        lambda: create_pools(ctx=ctx, clients=clients),
    ]
    if ctx.rgw.compression_type:
        subtasks.extend([
            lambda: configure_compression(ctx=ctx, clients=clients,
                                          compression=ctx.rgw.compression_type),
        ])
    if ctx.rgw.storage_classes:
        subtasks.extend([
            lambda: configure_storage_classes(ctx=ctx, clients=clients,
                                              storage_classes=ctx.rgw.storage_classes),
        ])
    subtasks.extend([
        lambda: start_rgw(ctx=ctx, config=config, clients=clients),
    ])

    with contextutil.nested(*subtasks):
        yield