| # |
| # 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 |
| |
| |
| 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.warn("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) |
| |
| |
| 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) |