golden hour

/usr/lib/python3.9/site-packages/pip/_vendor/cachecontrol

File/Folder	Size	Actions
__init__.py	302 B
__pycache__	-
_cmd.py	1.26 KB
adapter.py	4.77 KB
cache.py	805 B
caches	-
compat.py	695 B
controller.py	13.82 KB
filewrapper.py	2.47 KB
heuristics.py	3.97 KB
serialize.py	6.92 KB
wrapper.py	690 B

Edit: filewrapper.py

from io import BytesIO

class CallbackFileWrapper(object):
    """
    Small wrapper around a fp object which will tee everything read into a
    buffer, and when that file is closed it will execute a callback with the
    contents of that buffer.

All attributes are proxied to the underlying file object.

This class uses members with a double underscore (__) leading prefix so as
    not to accidentally shadow an attribute.
    """

def __init__(self, fp, callback):
        self.__buf = BytesIO()
        self.__fp = fp
        self.__callback = callback

def __getattr__(self, name):
        # The vaguaries of garbage collection means that self.__fp is
        # not always set.  By using __getattribute__ and the private
        # name[0] allows looking up the attribute value and raising an
        # AttributeError when it doesn't exist. This stop thigns from
        # infinitely recursing calls to getattr in the case where
        # self.__fp hasn't been set.
        #
        # [0] https://docs.python.org/2/reference/expressions.html#atom-identifiers
        fp = self.__getattribute__("_CallbackFileWrapper__fp")
        return getattr(fp, name)

def __is_fp_closed(self):
        try:
            return self.__fp.fp is None

except AttributeError:
            pass

try:
            return self.__fp.closed

except AttributeError:
            pass

# We just don't cache it then.
        # TODO: Add some logging here...
        return False

def _close(self):
        if self.__callback:
            self.__callback(self.__buf.getvalue())

# We assign this to None here, because otherwise we can get into
        # really tricky problems where the CPython interpreter dead locks
        # because the callback is holding a reference to something which
        # has a __del__ method. Setting this to None breaks the cycle
        # and allows the garbage collector to do it's thing normally.
        self.__callback = None

def read(self, amt=None):
        data = self.__fp.read(amt)
        self.__buf.write(data)
        if self.__is_fp_closed():
            self._close()

return data

def _safe_read(self, amt):
        data = self.__fp._safe_read(amt)
        if amt == 2 and data == b"\r\n":
            # urllib executes this read to toss the CRLF at the end
            # of the chunk.
            return data

self.__buf.write(data)
        if self.__is_fp_closed():
            self._close()

return data