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bazarr/libs/subliminal_patch/http.py

177 lines
6.0 KiB

# coding=utf-8
import certifi
import ssl
import os
import socket
import logging
import requests
import xmlrpclib
import dns.resolver
from requests import Session, exceptions
from urllib3.util import connection
from retry.api import retry_call
from exceptions import APIThrottled
from subzero.lib.io import get_viable_encoding
logger = logging.getLogger(__name__)
pem_file = os.path.normpath(os.path.join(os.path.dirname(os.path.realpath(unicode(__file__, get_viable_encoding()))), "..", certifi.where()))
try:
default_ssl_context = ssl.create_default_context(cafile=pem_file)
except AttributeError:
# < Python 2.7.9
default_ssl_context = None
custom_resolver = dns.resolver.Resolver(configure=False)
# 8.8.8.8 is Google's public DNS server
custom_resolver.nameservers = ['8.8.8.8', '1.1.1.1']
class CertifiSession(Session):
timeout = 10
def __init__(self):
super(CertifiSession, self).__init__()
self.verify = pem_file
def request(self, *args, **kwargs):
if kwargs.get('timeout') is None:
kwargs['timeout'] = self.timeout
return super(CertifiSession, self).request(*args, **kwargs)
class RetryingSession(CertifiSession):
proxied_functions = ("get", "post")
def __init__(self):
super(CertifiSession, self).__init__()
self.verify = pem_file
proxy = os.environ.get('SZ_HTTP_PROXY')
if proxy:
self.proxies = {
"http": proxy,
"https": proxy
}
def retry_method(self, method, *args, **kwargs):
if self.proxies:
# fixme: may be a little loud
logger.debug("Using proxy %s for: %s", self.proxies["http"], args[0])
return retry_call(getattr(super(CertifiSession, self), method), fargs=args, fkwargs=kwargs, tries=3, delay=5,
exceptions=(exceptions.ConnectionError,
exceptions.ProxyError,
exceptions.SSLError,
exceptions.Timeout,
exceptions.ConnectTimeout,
exceptions.ReadTimeout,
socket.timeout))
def get(self, *args, **kwargs):
if self.proxies and "timeout" in kwargs and kwargs["timeout"]:
kwargs["timeout"] = kwargs["timeout"] * 3
return self.retry_method("get", *args, **kwargs)
def post(self, *args, **kwargs):
if self.proxies and "timeout" in kwargs and kwargs["timeout"]:
kwargs["timeout"] = kwargs["timeout"] * 3
return self.retry_method("post", *args, **kwargs)
class SubZeroRequestsTransport(xmlrpclib.SafeTransport):
"""
Drop in Transport for xmlrpclib that uses Requests instead of httplib
Based on: https://gist.github.com/chrisguitarguy/2354951#gistcomment-2388906
"""
# change our user agent to reflect Requests
user_agent = "Python XMLRPC with Requests (python-requests.org)"
proxies = None
def __init__(self, use_https=True, verify=None, user_agent=None, timeout=10, *args, **kwargs):
self.verify = pem_file if verify is None else verify
self.use_https = use_https
self.user_agent = user_agent if user_agent is not None else self.user_agent
self.timeout = timeout
proxy = os.environ.get('SZ_HTTP_PROXY')
if proxy:
self.proxies = {
"http": proxy,
"https": proxy
}
xmlrpclib.SafeTransport.__init__(self, *args, **kwargs)
def request(self, host, handler, request_body, verbose=0):
"""
Make an xmlrpc request.
"""
headers = {'User-Agent': self.user_agent}
url = self._build_url(host, handler)
try:
resp = requests.post(url, data=request_body, headers=headers,
stream=True, timeout=self.timeout, proxies=self.proxies,
verify=self.verify)
except ValueError:
raise
except Exception:
raise # something went wrong
else:
resp.raise_for_status()
try:
if 'x-ratelimit-remaining' in resp.headers and int(resp.headers['x-ratelimit-remaining']) <= 2:
raise APIThrottled()
except ValueError:
logger.info('Couldn\'t parse "x-ratelimit-remaining": %r' % resp.headers['x-ratelimit-remaining'])
self.verbose = verbose
try:
return self.parse_response(resp.raw)
except:
logger.debug("Bad response data: %r", resp.raw)
def _build_url(self, host, handler):
"""
Build a url for our request based on the host, handler and use_http
property
"""
scheme = 'https' if self.use_https else 'http'
handler = handler[1:] if handler and handler[0] == "/" else handler
return '%s://%s/%s' % (scheme, host, handler)
_orig_create_connection = connection.create_connection
dns_cache = {}
def set_custom_resolver():
def patched_create_connection(address, *args, **kwargs):
"""Wrap urllib3's create_connection to resolve the name elsewhere"""
# resolve hostname to an ip address; use your own
# resolver here, as otherwise the system resolver will be used.
host, port = address
if host in dns_cache:
ip = dns_cache[host]
logger.debug("Using %s=%s from cache", host, ip)
else:
try:
ip = custom_resolver.query(host)[0].address
dns_cache[host] = ip
except dns.exception.DNSException:
logger.warning("Couldn't resolve %s with DNS: %s", host, custom_resolver.nameservers)
return _orig_create_connection((host, port), *args, **kwargs)
logger.debug("Resolved %s to %s using %s", host, ip, custom_resolver.nameservers)
return _orig_create_connection((ip, port), *args, **kwargs)
connection.create_connection = patched_create_connection