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annotate lib/python3.8/site-packages/pip/_vendor/cachecontrol/filewrapper.py @ 0:9e54283cc701 draft

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"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author guerler
date Mon, 27 Jul 2020 03:47:31 -0400
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1 from io import BytesIO
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2
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3
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4 class CallbackFileWrapper(object):
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5 """
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6 Small wrapper around a fp object which will tee everything read into a
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7 buffer, and when that file is closed it will execute a callback with the
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8 contents of that buffer.
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9
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10 All attributes are proxied to the underlying file object.
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11
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12 This class uses members with a double underscore (__) leading prefix so as
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13 not to accidentally shadow an attribute.
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14 """
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15
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16 def __init__(self, fp, callback):
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17 self.__buf = BytesIO()
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18 self.__fp = fp
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19 self.__callback = callback
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20
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21 def __getattr__(self, name):
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22 # The vaguaries of garbage collection means that self.__fp is
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23 # not always set. By using __getattribute__ and the private
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24 # name[0] allows looking up the attribute value and raising an
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25 # AttributeError when it doesn't exist. This stop thigns from
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26 # infinitely recursing calls to getattr in the case where
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27 # self.__fp hasn't been set.
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28 #
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29 # [0] https://docs.python.org/2/reference/expressions.html#atom-identifiers
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30 fp = self.__getattribute__("_CallbackFileWrapper__fp")
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31 return getattr(fp, name)
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32
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33 def __is_fp_closed(self):
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34 try:
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35 return self.__fp.fp is None
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36
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37 except AttributeError:
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38 pass
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39
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40 try:
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41 return self.__fp.closed
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42
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43 except AttributeError:
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44 pass
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45
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46 # We just don't cache it then.
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47 # TODO: Add some logging here...
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48 return False
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49
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50 def _close(self):
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51 if self.__callback:
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52 self.__callback(self.__buf.getvalue())
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53
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54 # We assign this to None here, because otherwise we can get into
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55 # really tricky problems where the CPython interpreter dead locks
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56 # because the callback is holding a reference to something which
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57 # has a __del__ method. Setting this to None breaks the cycle
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58 # and allows the garbage collector to do it's thing normally.
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59 self.__callback = None
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60
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61 def read(self, amt=None):
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62 data = self.__fp.read(amt)
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63 self.__buf.write(data)
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64 if self.__is_fp_closed():
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65 self._close()
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66
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67 return data
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68
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69 def _safe_read(self, amt):
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70 data = self.__fp._safe_read(amt)
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71 if amt == 2 and data == b"\r\n":
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72 # urllib executes this read to toss the CRLF at the end
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73 # of the chunk.
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74 return data
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75
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76 self.__buf.write(data)
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77 if self.__is_fp_closed():
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78 self._close()
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79
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80 return data