#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF 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.
#
"""Utility functions used for creating a common Http client from httplib2.
For internal use only. No backwards compatibility guarantees.
"""
from __future__ import absolute_import
import logging
import os
import re
import httplib2
# This is the number of seconds the library will wait for GCS operations to
# complete.
DEFAULT_HTTP_TIMEOUT_SECONDS = 60
[docs]def proxy_info_from_environment_var(proxy_env_var):
"""Reads proxy info from the environment and converts to httplib2.ProxyInfo.
Args:
proxy_env_var: environment variable string to read, http_proxy or
https_proxy (in lower case).
Example: http://myproxy.domain.com:8080
Returns:
httplib2.ProxyInfo constructed from the environment string.
"""
proxy_url = os.environ.get(proxy_env_var)
if not proxy_url:
return None
proxy_protocol = proxy_env_var.lower().split('_')[0]
if not re.match('^https?://', proxy_url, flags=re.IGNORECASE):
logging.warning("proxy_info_from_url requires a protocol, which is always "
"http or https.")
proxy_url = proxy_protocol + '://' + proxy_url
return httplib2.proxy_info_from_url(proxy_url, method=proxy_protocol)
[docs]def get_new_http():
"""Creates and returns a new httplib2.Http instance.
Returns:
An initialized httplib2.Http instance.
"""
proxy_info = None
for proxy_env_var in ['http_proxy', 'https_proxy']:
if os.environ.get(proxy_env_var):
proxy_info = proxy_info_from_environment_var(proxy_env_var)
break
# Use a non-infinite SSL timeout to avoid hangs during network flakiness.
return httplib2.Http(proxy_info=proxy_info,
timeout=DEFAULT_HTTP_TIMEOUT_SECONDS)