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# Copyright (c) 2016 Cable Television Laboratories, Inc. ("CableLabs")
# and others. 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.
import os
import urllib2
import logging
import yaml
__author__ = 'spisarski'
"""
Utilities for basic file handling
"""
logger = logging.getLogger('file_utils')
def file_exists(file_path):
"""
Returns True if the image file already exists and throws an exception if the path is a directory
:return:
"""
if os.path.exists(file_path):
if os.path.isdir(file_path):
return False
return os.path.isfile(file_path)
return False
def get_file(file_path):
"""
Returns True if the image file has already been downloaded
:return: the image file object
:raise Exception when file cannot be found
"""
if file_exists(file_path):
return open(file_path, 'r')
else:
raise Exception('File with path cannot be found - ' + file_path)
def download(url, dest_path):
"""
Download a file to a destination path given a URL
:rtype : File object
"""
name = url.rsplit('/')[-1]
dest = dest_path + '/' + name
try:
# Override proxy settings to use localhost to download file
proxy_handler = urllib2.ProxyHandler({})
opener = urllib2.build_opener(proxy_handler)
urllib2.install_opener(opener)
response = urllib2.urlopen(url)
except (urllib2.HTTPError, urllib2.URLError):
raise Exception
with open(dest, 'wb') as f:
f.write(response.read())
return f
def read_yaml(config_file_path):
"""
Reads the yaml file and returns a dictionary object representation
:param config_file_path: The file path to config
:return: a dictionary
"""
logger.debug('Attempting to load configuration file - ' + config_file_path)
with open(config_file_path) as config_file:
config = yaml.safe_load(config_file)
logger.info('Loaded configuration')
config_file.close()
logger.info('Closing configuration file')
return config
def read_os_env_file(os_env_filename):
"""
Reads the OS environment source file and returns a map of each key/value
Will ignore lines beginning with a '#' and will replace any single or double quotes contained within the value
:param os_env_filename: The name of the OS environment file to read
:return: a dictionary
"""
if os_env_filename:
logger.info('Attempting to read OS environment file - ' + os_env_filename)
out = {}
for line in open(os_env_filename):
line = line.lstrip()
if not line.startswith('#') and line.startswith('export '):
line = line.lstrip('export ').strip()
tokens = line.split('=')
if len(tokens) > 1:
# Remove leading and trailing ' & " characters from value
out[tokens[0]] = tokens[1].lstrip('\'').lstrip('\"').rstrip('\'').rstrip('\"')
return out
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