old_contents: #!/usr/bin/env python
  # Licensed to Cloudera, Inc. under one
  # or more contributor license agreements.  See the NOTICE file
  # distributed with this work for additional information
  # regarding copyright ownership.  Cloudera, Inc. licenses this file
  # to you 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.
  
  import os
  
  from django.utils.translation import ugettext_lazy as _t
  
  from desktop.lib.conf import Config, validate_thrift_transport, coerce_str_lowercase, coerce_bool
  
  
  HBASE_CLUSTERS = Config(
    key="hbase_clusters",
    default="(Cluster|localhost:9090)",
    help=_t("Comma-separated list of HBase Thrift servers for clusters in the format of '(name|host:port)'. Use full hostname with security."
            "Prefix hostname with https:// if using SSL and http mode with impersonation."),
    type=str
  )
  
  TRUNCATE_LIMIT = Config(
    key="truncate_limit",
    default="500",
    help=_t("Hard limit of rows or columns per row fetched before truncating."),
    type=int
  )
  
  THRIFT_TRANSPORT = Config(
    key="thrift_transport",
    default="buffered",
    help=_t("'buffered' is the default of the HBase Thrift Server and supports security. " +
         "'framed' can be used to chunk up responses, " +
         "which is useful when used in conjunction with the nonblocking server in Thrift."),
    type=str
  )
  
  HBASE_CONF_DIR = Config(
    key='hbase_conf_dir',
    help=_t('HBase configuration directory, where hbase-site.xml is located.'),
    default=os.environ.get("HBASE_CONF_DIR", '/etc/hbase/conf')
  )
  
  # Hidden, just for making patching of older version of Hue easier. To remove in Hue 4.
  USE_DOAS = Config(
    key='use_doas',
    help=_t('Force Hue to use Http Thrift mode with doas impersonation, regarless of hbase-site.xml properties.'),
    default=False,
    type=coerce_bool
  )
  
  
  def config_validator(user):
    res = []
  
    res.extend(validate_thrift_transport(THRIFT_TRANSPORT))
  
    return res
  
new_contents: #!/usr/bin/env python
  # Licensed to Cloudera, Inc. under one
  # or more contributor license agreements.  See the NOTICE file
  # distributed with this work for additional information
  # regarding copyright ownership.  Cloudera, Inc. licenses this file
  # to you 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.
  
  import logging
  import os
  import sys
  
  from django.utils.translation import ugettext_lazy as _t, ugettext as _
  
  from desktop.lib.conf import Config, validate_thrift_transport, coerce_bool
  from desktop.lib.exceptions import StructuredThriftTransportException
  
  LOG = logging.getLogger(__name__)
  
  
  HBASE_CLUSTERS = Config(
    key="hbase_clusters",
    default="(Cluster|localhost:9090)",
    help=_t("Comma-separated list of HBase Thrift servers for clusters in the format of '(name|host:port)'. Use full hostname with security."
            "Prefix hostname with https:// if using SSL and http mode with impersonation."),
    type=str
  )
  
  TRUNCATE_LIMIT = Config(
    key="truncate_limit",
    default="500",
    help=_t("Hard limit of rows or columns per row fetched before truncating."),
    type=int
  )
  
  THRIFT_TRANSPORT = Config(
    key="thrift_transport",
    default="buffered",
    help=_t("'buffered' is the default of the HBase Thrift Server and supports security. " +
         "'framed' can be used to chunk up responses, " +
         "which is useful when used in conjunction with the nonblocking server in Thrift."),
    type=str
  )
  
  HBASE_CONF_DIR = Config(
    key='hbase_conf_dir',
    help=_t('HBase configuration directory, where hbase-site.xml is located.'),
    default=os.environ.get("HBASE_CONF_DIR", '/etc/hbase/conf')
  )
  
  # Hidden, just for making patching of older version of Hue easier. To remove in Hue 4.
  USE_DOAS = Config(
    key='use_doas',
    help=_t('Force Hue to use Http Thrift mode with doas impersonation, regarless of hbase-site.xml properties.'),
    default=False,
    type=coerce_bool
  )
  
  
  def config_validator(user):
    res = []
  
    from hbase.api import HbaseApi
    from hbase.settings import NICE_NAME
  
    try:
      if not 'test' in sys.argv: # Avoid tests hanging
        api = HbaseApi(user=user)
        cluster_name = api.getClusters()[0]['name'] # Currently pick first configured cluster
        # Check connectivity
        api.connectCluster(cluster_name)
        api.getTableList(cluster_name)
    except Exception, e:
      print e
      if 'Could not connect' in str(e):
        msg = "The application won't work without a running HBase Thrift Server v1."
      else:
        msg = 'Failed to authenticate to HBase Thrift Server, check authentication configurations.'
      LOG.exception(msg)
      res.append((NICE_NAME, _(msg)))
  
  
    res.extend(validate_thrift_transport(THRIFT_TRANSPORT))
  
    return res
  
subject: Add a config check for missing Thrift server or misconfiguration