Source code for sdmx.remote
import logging
from io import BufferedIOBase, BytesIO
from warnings import warn
import requests
try:
from requests_cache import CachedSession as MaybeCachedSession
except ImportError: # pragma: no cover
warn(
"optional dependency requests_cache is not installed; cache options "
"to Session() have no effect",
RuntimeWarning,
)
from requests import Session as MaybeCachedSession
logger = logging.getLogger(__name__)
[docs]class Session(MaybeCachedSession):
""":class:`requests.Session` subclass with optional caching.
If requests_cache is installed, this class caches responses.
"""
def __init__(self, timeout=30.1, proxies=None, stream=False, **kwargs):
if MaybeCachedSession is not requests.Session:
# Using requests_cache.CachedSession
# No cache keyword arguments supplied = don't use the cache
disabled = set(kwargs.keys()) <= {"get_footer_url"}
if disabled:
# Avoid creating any file
kwargs["backend"] = "memory"
super(Session, self).__init__(**kwargs)
# Overwrite value from requests_cache.CachedSession.__init__()
self._is_cache_disabled = disabled
elif len(kwargs):
raise ValueError(
"Cache arguments have no effect without "
"requests_session: %s" % kwargs
)
else:
# Plain requests.Session
super(Session, self).__init__()
# Overwrite values from requests.Session.__init__()
self.proxies = proxies
self.timeout = timeout
self.stream = stream
[docs]class ResponseIO(BufferedIOBase):
"""Buffered wrapper for :class:`requests.Response` with optional file output.
:class:`ResponseIO` wraps a :class:`requests.Response` object's 'content'
attribute, providing a file-like object from which bytes can be :meth:`read`
incrementally.
Parameters
----------
response : :class:`requests.Response`
HTTP response to wrap.
tee : binary, writable :py:class:`io.BufferedIOBasè`, defaults to io.BytesIO()
*tee* is exposed as *self.tee* and not closed explicitly.
"""
def __init__(self, response, tee=None):
self.response = response
if tee is None:
tee = BytesIO()
# If tee is a file-like object or tempfile, then use it as cache
if isinstance(tee, BufferedIOBase) or hasattr(tee, "file"):
self.tee = tee
else:
# So tee must be str or os.FilePath
self.tee = open(tee, "w+b")
self.tee.write(response.content)
self.tee.seek(0)
def readable(self):
return True
def read(self, size=-1):
"""Read and return up to `size` bytes by calling ``self.tee.read()``."""
return self.tee.read(size)