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260 lines
7.2 KiB
260 lines
7.2 KiB
8 years ago
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# -*- coding: utf-8 -
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#
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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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from gunicorn.http.errors import (NoMoreData, ChunkMissingTerminator,
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InvalidChunkSize)
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from gunicorn import six
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class ChunkedReader(object):
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def __init__(self, req, unreader):
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self.req = req
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self.parser = self.parse_chunked(unreader)
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self.buf = six.BytesIO()
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def read(self, size):
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if not isinstance(size, six.integer_types):
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raise TypeError("size must be an integral type")
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if size < 0:
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raise ValueError("Size must be positive.")
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if size == 0:
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return b""
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if self.parser:
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while self.buf.tell() < size:
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try:
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self.buf.write(six.next(self.parser))
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except StopIteration:
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self.parser = None
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break
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data = self.buf.getvalue()
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ret, rest = data[:size], data[size:]
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self.buf = six.BytesIO()
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self.buf.write(rest)
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return ret
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def parse_trailers(self, unreader, data):
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buf = six.BytesIO()
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buf.write(data)
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idx = buf.getvalue().find(b"\r\n\r\n")
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done = buf.getvalue()[:2] == b"\r\n"
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while idx < 0 and not done:
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self.get_data(unreader, buf)
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idx = buf.getvalue().find(b"\r\n\r\n")
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done = buf.getvalue()[:2] == b"\r\n"
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if done:
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unreader.unread(buf.getvalue()[2:])
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return b""
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self.req.trailers = self.req.parse_headers(buf.getvalue()[:idx])
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unreader.unread(buf.getvalue()[idx + 4:])
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def parse_chunked(self, unreader):
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(size, rest) = self.parse_chunk_size(unreader)
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while size > 0:
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while size > len(rest):
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size -= len(rest)
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yield rest
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rest = unreader.read()
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if not rest:
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raise NoMoreData()
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yield rest[:size]
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# Remove \r\n after chunk
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rest = rest[size:]
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while len(rest) < 2:
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rest += unreader.read()
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if rest[:2] != b'\r\n':
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raise ChunkMissingTerminator(rest[:2])
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(size, rest) = self.parse_chunk_size(unreader, data=rest[2:])
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def parse_chunk_size(self, unreader, data=None):
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buf = six.BytesIO()
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if data is not None:
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buf.write(data)
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idx = buf.getvalue().find(b"\r\n")
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while idx < 0:
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self.get_data(unreader, buf)
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idx = buf.getvalue().find(b"\r\n")
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data = buf.getvalue()
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line, rest_chunk = data[:idx], data[idx + 2:]
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chunk_size = line.split(b";", 1)[0].strip()
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try:
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chunk_size = int(chunk_size, 16)
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except ValueError:
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raise InvalidChunkSize(chunk_size)
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if chunk_size == 0:
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try:
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self.parse_trailers(unreader, rest_chunk)
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except NoMoreData:
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pass
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return (0, None)
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return (chunk_size, rest_chunk)
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def get_data(self, unreader, buf):
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data = unreader.read()
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if not data:
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raise NoMoreData()
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buf.write(data)
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class LengthReader(object):
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def __init__(self, unreader, length):
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self.unreader = unreader
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self.length = length
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def read(self, size):
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if not isinstance(size, six.integer_types):
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raise TypeError("size must be an integral type")
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size = min(self.length, size)
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if size < 0:
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raise ValueError("Size must be positive.")
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if size == 0:
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return b""
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buf = six.BytesIO()
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data = self.unreader.read()
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while data:
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buf.write(data)
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if buf.tell() >= size:
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break
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data = self.unreader.read()
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buf = buf.getvalue()
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ret, rest = buf[:size], buf[size:]
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self.unreader.unread(rest)
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self.length -= size
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return ret
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class EOFReader(object):
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def __init__(self, unreader):
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self.unreader = unreader
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self.buf = six.BytesIO()
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self.finished = False
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def read(self, size):
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if not isinstance(size, six.integer_types):
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raise TypeError("size must be an integral type")
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if size < 0:
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raise ValueError("Size must be positive.")
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if size == 0:
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return b""
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if self.finished:
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data = self.buf.getvalue()
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ret, rest = data[:size], data[size:]
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self.buf = six.BytesIO()
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self.buf.write(rest)
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return ret
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data = self.unreader.read()
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while data:
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self.buf.write(data)
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if self.buf.tell() > size:
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break
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data = self.unreader.read()
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if not data:
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self.finished = True
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data = self.buf.getvalue()
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ret, rest = data[:size], data[size:]
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self.buf = six.BytesIO()
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self.buf.write(rest)
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return ret
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class Body(object):
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def __init__(self, reader):
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self.reader = reader
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self.buf = six.BytesIO()
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def __iter__(self):
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return self
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def __next__(self):
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ret = self.readline()
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if not ret:
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raise StopIteration()
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return ret
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next = __next__
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def getsize(self, size):
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if size is None:
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return six.MAXSIZE
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elif not isinstance(size, six.integer_types):
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raise TypeError("size must be an integral type")
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elif size < 0:
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return six.MAXSIZE
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return size
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def read(self, size=None):
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size = self.getsize(size)
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if size == 0:
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return b""
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if size < self.buf.tell():
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data = self.buf.getvalue()
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ret, rest = data[:size], data[size:]
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self.buf = six.BytesIO()
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self.buf.write(rest)
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return ret
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while size > self.buf.tell():
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data = self.reader.read(1024)
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if not data:
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break
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self.buf.write(data)
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data = self.buf.getvalue()
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ret, rest = data[:size], data[size:]
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self.buf = six.BytesIO()
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self.buf.write(rest)
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return ret
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def readline(self, size=None):
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size = self.getsize(size)
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if size == 0:
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return b""
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data = self.buf.getvalue()
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self.buf = six.BytesIO()
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ret = []
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while 1:
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idx = data.find(b"\n", 0, size)
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idx = idx + 1 if idx >= 0 else size if len(data) >= size else 0
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if idx:
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ret.append(data[:idx])
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self.buf.write(data[idx:])
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break
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ret.append(data)
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size -= len(data)
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data = self.reader.read(min(1024, size))
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if not data:
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break
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return b"".join(ret)
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def readlines(self, size=None):
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ret = []
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data = self.read()
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while data:
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pos = data.find(b"\n")
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if pos < 0:
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ret.append(data)
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data = b""
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else:
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line, data = data[:pos + 1], data[pos + 1:]
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ret.append(line)
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return ret
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