78 lines
1.9 KiB
Python
78 lines
1.9 KiB
Python
#
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# This file is part of gunicorn released under the MIT license.
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# See the NOTICE for more information.
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import io
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import os
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# Classes that can undo reading data from
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# a given type of data source.
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class Unreader:
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def __init__(self):
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self.buf = io.BytesIO()
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def chunk(self):
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raise NotImplementedError()
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def read(self, size=None):
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if size is not None and not isinstance(size, int):
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raise TypeError("size parameter must be an int or long.")
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if size is not None:
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if size == 0:
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return b""
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if size < 0:
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size = None
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self.buf.seek(0, os.SEEK_END)
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if size is None and self.buf.tell():
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ret = self.buf.getvalue()
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self.buf = io.BytesIO()
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return ret
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if size is None:
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d = self.chunk()
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return d
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while self.buf.tell() < size:
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chunk = self.chunk()
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if not chunk:
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ret = self.buf.getvalue()
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self.buf = io.BytesIO()
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return ret
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self.buf.write(chunk)
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data = self.buf.getvalue()
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self.buf = io.BytesIO()
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self.buf.write(data[size:])
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return data[:size]
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def unread(self, data):
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self.buf.seek(0, os.SEEK_END)
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self.buf.write(data)
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class SocketUnreader(Unreader):
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def __init__(self, sock, max_chunk=8192):
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super().__init__()
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self.sock = sock
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self.mxchunk = max_chunk
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def chunk(self):
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return self.sock.recv(self.mxchunk)
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class IterUnreader(Unreader):
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def __init__(self, iterable):
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super().__init__()
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self.iter = iter(iterable)
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def chunk(self):
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if not self.iter:
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return b""
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try:
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return next(self.iter)
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except StopIteration:
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self.iter = None
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return b""
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