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# Copyright (c) 2017 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 logging
try:
import urllib.request as urllib
except ImportError:
import urllib2 as urllib
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 download(url, dest_path, name=None):
"""
Download a file to a destination path given a URL
:param url: the endpoint to the file to download
:param dest_path: the directory to save the file
:param name: the file name (optional)
:rtype : File object
"""
if not name:
name = url.rsplit('/')[-1]
dest = dest_path + '/' + name
logger.debug('Downloading file from - ' + url)
# Override proxy settings to use localhost to download file
download_file = None
if not os.path.isdir(dest_path):
try:
os.mkdir(dest_path)
except:
raise
try:
with open(dest, 'wb') as download_file:
logger.debug('Saving file to - ' + os.path.abspath(download_file.name))
response = __get_url_response(url)
download_file.write(response.read())
return download_file
finally:
if download_file:
download_file.close()
def get_content_length(url):
"""
Returns the number of bytes to be downloaded from the given URL
:param url: the URL to inspect
:return: the number of bytes
"""
response = __get_url_response(url)
return response.headers['Content-Length']
def __get_url_response(url):
"""
Returns a response object for a given URL
:param url: the URL
:return: the response
"""
proxy_handler = urllib.ProxyHandler({})
opener = urllib.build_opener(proxy_handler)
urllib.install_opener(opener)
return urllib.urlopen(url)
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)
config_file = None
try:
with open(config_file_path) as config_file:
config = yaml.safe_load(config_file)
logger.info('Loaded configuration')
return config
finally:
if config_file:
logger.info('Closing configuration file')
config_file.close()
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 - %s',
os_env_filename)
out = {}
env_file = None
try:
env_file = open(os_env_filename)
for line in env_file:
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('\"')
finally:
if env_file:
env_file.close()
return out
def read_file(filename):
"""
Returns the contents of a file as a string
:param filename: the name of the file
:return:
"""
out = str()
the_file = None
try:
the_file = open(filename)
for line in the_file:
out += line
return out
finally:
if the_file:
the_file.close()
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